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Laguta V, Havlak L, Babin V, Barta J, Pejchal J, Nikl M. Charge Transfer and Charge Trapping Processes in Ca- or Al-Co-doped Lu 2SiO 5 and Lu 2Si 2O 7 Scintillators Activated by Pr 3+ or Ce 3+ Ions. Materials (Basel) 2023; 16:4488. [PMID: 37374673 DOI: 10.3390/ma16124488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Revised: 06/09/2023] [Accepted: 06/13/2023] [Indexed: 06/29/2023]
Abstract
Lutetium oxyorthosilicate Lu2SiO5 (LSO) and pyrosilicate Lu2Si2O7 (LPS) activated by Ce3+ or Pr3+ are known to be effective and fast scintillation materials for the detection of X-rays and γ-rays. Their performances can be further improved by co-doping with aliovalent ions. Herein, we investigate the Ce3+(Pr3+) → Ce4+(Pr4+) conversion and the formation of lattice defects stimulated by co-doping with Ca2+ and Al3+ in LSO and LPS powders prepared by the solid-state reaction process. The materials were studied by electron paramagnetic resonance (EPR), radioluminescence spectroscopy, and thermally stimulated luminescence (TSL), and scintillation decays were measured. EPR measurements of both LSO:Ce and LPS:Ce showed effective Ce3+ → Ce4+ conversions stimulated by Ca2+ co-doping, while the effect of Al3+ co-doping was less effective. In Pr-doped LSO and LPS, a similar Pr3+ → Pr4+ conversion was not detected by EPR, suggesting that the charge compensation of Al3+ and Ca2+ ions is realized via other impurities and/or lattice defects. X-ray irradiation of LPS creates hole centers attributed to a hole trapped in an oxygen ion in the neighborhood of Al3+ and Ca2+. These hole centers contribute to an intense TSL glow peak at 450-470 K. In contrast to LPS, only weak TSL peaks are detected in LSO and no hole centers are visible via EPR. The scintillation decay curves of both LSO and LPS show a bi-exponential decay with fast and slow component decay times of 10-13 ns and 30-36 ns, respectively. The decay time of the fast component shows a small (6-8%) decrease due to co-doping.
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Affiliation(s)
- Valentyn Laguta
- Institute of Physics of the Czech Academy of Sciences, Cukrovarnicka 10/112, 16200 Prague, Czech Republic
| | - Lubomir Havlak
- Institute of Physics of the Czech Academy of Sciences, Cukrovarnicka 10/112, 16200 Prague, Czech Republic
| | - Vladimir Babin
- Institute of Physics of the Czech Academy of Sciences, Cukrovarnicka 10/112, 16200 Prague, Czech Republic
| | - Jan Barta
- Institute of Physics of the Czech Academy of Sciences, Cukrovarnicka 10/112, 16200 Prague, Czech Republic
- Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 11519 Prague, Czech Republic
| | - Jan Pejchal
- Institute of Physics of the Czech Academy of Sciences, Cukrovarnicka 10/112, 16200 Prague, Czech Republic
| | - Martin Nikl
- Institute of Physics of the Czech Academy of Sciences, Cukrovarnicka 10/112, 16200 Prague, Czech Republic
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Secchi V, Cova F, Villa I, Babin V, Nikl M, Campione M, Monguzzi A. Energy Partitioning in Multicomponent Nanoscintillators for Enhanced Localized Radiotherapy. ACS Appl Mater Interfaces 2023; 15:24693-24700. [PMID: 37172016 DOI: 10.1021/acsami.3c00853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Multicomponent nanomaterials consisting of dense scintillating particles functionalized by or embedding optically active conjugated photosensitizers (PSs) for cytotoxic reactive oxygen species (ROS) have been proposed in the last decade as coadjuvant agents for radiotherapy of cancer. They have been designed to make scintillation-activated sensitizers for ROS production in an aqueous environment under exposure to ionizing radiations. However, a detailed understanding of the global energy partitioning process occurring during the scintillation is still missing, in particular regarding the role of the non-radiative energy transfer between the nanoscintillator and the conjugated moieties which is usually considered crucial for the activation of PSs and therefore pivotal to enhance the therapeutic effect. We investigate this mechanism in a series of PS-functionalized scintillating nanotubes where the non-radiative energy transfer yield has been tuned by control of the intermolecular distance between the nanotube and the conjugated system. The obtained results indicate that non-radiative energy transfer has a negligible effect on the ROS sensitization efficiency, thus opening the way to the development of different architectures for breakthrough radiotherapy coadjutants to be tested in clinics.
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Affiliation(s)
- Valeria Secchi
- Dipartimento di Scienza Dei Materiali, Università Degli Studi Milano-Bicocca, 20125 Milano, Italy
- NANOMIB, Center for Biomedical Nanomedicine, University of Milano-Bicocca, P.zza Ateneo Nuovo 1, 20126 Milan, Italy
| | - Francesca Cova
- Dipartimento di Scienza Dei Materiali, Università Degli Studi Milano-Bicocca, 20125 Milano, Italy
| | - Irene Villa
- Dipartimento di Scienza Dei Materiali, Università Degli Studi Milano-Bicocca, 20125 Milano, Italy
- FZU─Institute of Physics of the Czech Academy of Sciences, Cukrovarnická 10/112, 16 200 Prague, Czech Republic
| | - Vladimir Babin
- FZU─Institute of Physics of the Czech Academy of Sciences, Cukrovarnická 10/112, 16 200 Prague, Czech Republic
| | - Martin Nikl
- FZU─Institute of Physics of the Czech Academy of Sciences, Cukrovarnická 10/112, 16 200 Prague, Czech Republic
| | - Marcello Campione
- NANOMIB, Center for Biomedical Nanomedicine, University of Milano-Bicocca, P.zza Ateneo Nuovo 1, 20126 Milan, Italy
- Department of Earth and Environmental Sciences, Università Degli Studi Milano-Bicocca, Piazza Della Scienza 4, 20126 Milano, Italy
| | - Angelo Monguzzi
- Dipartimento di Scienza Dei Materiali, Università Degli Studi Milano-Bicocca, 20125 Milano, Italy
- NANOMIB, Center for Biomedical Nanomedicine, University of Milano-Bicocca, P.zza Ateneo Nuovo 1, 20126 Milan, Italy
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Buryi M, Babin V, Neykova N, Wang YM, Remeš Z, Ridzoňová K, Dominec F, Davydova M, Drahokoupil J, Chertopalov S, Landová L, Pop-Georgievski O. Changes to Material Phase and Morphology Due to High-Level Molybdenum Doping of ZnO Nanorods: Influence on Luminescence and Defects. Materials (Basel) 2023; 16:ma16093294. [PMID: 37176178 PMCID: PMC10178970 DOI: 10.3390/ma16093294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 04/14/2023] [Accepted: 04/17/2023] [Indexed: 05/15/2023]
Abstract
The influence of Mo on the electronic states and crystalline structure, as well as morphology, phase composition, luminescence, and defects in ZnO rods grown as free-standing nanoparticles, was studied using a variety of experimental techniques. Mo has almost no influence on the luminescence of the grown ZnO particles, whereas shallow donors are strongly affected in ZnO rods. Annealing in air causes exciton and defect-related bands to drop upon Mo doping level. The increase of the Mo doping level from 20 to 30% leads to the creation of dominating molybdates. This leads to a concomitant drop in the number of formed ZnO nanorods.
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Affiliation(s)
- Maksym Buryi
- FZU-Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague, Czech Republic
- Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Trojanova 13, 120 00 Prague, Czech Republic
| | - Vladimir Babin
- FZU-Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague, Czech Republic
| | - Neda Neykova
- FZU-Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague, Czech Republic
- Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, 166 27 Prague, Czech Republic
| | - Yu-Min Wang
- Department of Chemistry and Physics of Surfaces and Interfaces, Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovský sq. 2, 162 06 Prague, Czech Republic
| | - Zdeněk Remeš
- FZU-Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague, Czech Republic
| | - Katarína Ridzoňová
- FZU-Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague, Czech Republic
- Faculty of Mathematics and Physics, Institute of Physics, Charles University, Ke Karlovu 5, 121 16 Prague, Czech Republic
| | - Filip Dominec
- FZU-Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague, Czech Republic
| | - Marina Davydova
- FZU-Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague, Czech Republic
| | - Jan Drahokoupil
- FZU-Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague, Czech Republic
| | - Sergii Chertopalov
- FZU-Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague, Czech Republic
| | - Lucie Landová
- FZU-Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague, Czech Republic
- Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, 166 27 Prague, Czech Republic
| | - Ognen Pop-Georgievski
- Department of Chemistry and Physics of Surfaces and Interfaces, Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovský sq. 2, 162 06 Prague, Czech Republic
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Buryi M, Tratsiak Y, Trusova E, Babin V, Paterek J, Kučerková R, Remeš Z, Hájek F, Landová L, Drahokoupil J, Chertopalov S. Synthesis of the cerium doped Gd3Al3Ga2O12-based glass nanoceramics: Luminescence and optical absorption properties. RADIAT MEAS 2023. [DOI: 10.1016/j.radmeas.2023.106932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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Buryi M, Babin V, Hubáček T, Jarý V, Hájek F, Kuldová K, Artemenko A, Hospodková A. The influence of Si on the properties of MOVPE grown GaN thin films: Optical and EPR study. RADIAT MEAS 2022. [DOI: 10.1016/j.radmeas.2022.106842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Li W, Li Y, Nikl M, Hamel M, Wu H, Qian S, Kucerkova R, Babin V, Ren G, Wu Y. Preparation and performance of plastic scintillators with copper iodide complex-loaded for radiation detection. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.124832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Děcká K, Král J, Hájek F, Průša P, Babin V, Mihóková E, Čuba V. Scintillation Response Enhancement in Nanocrystalline Lead Halide Perovskite Thin Films on Scintillating Wafers. Nanomaterials (Basel) 2021; 12:nano12010014. [PMID: 35009964 PMCID: PMC8746850 DOI: 10.3390/nano12010014] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 12/15/2021] [Accepted: 12/17/2021] [Indexed: 12/16/2022]
Abstract
Lead halide perovskite nanocrystals of the formula CsPbBr3 have recently been identified as potential time taggers in scintillating heterostructures for time-of-flight positron emission tomography (TOF-PET) imaging thanks to their ultrafast decay kinetics. This study investigates the potential of this material experimentally. We fabricated CsPbBr3 thin films on scintillating GGAG:Ce (Gd2.985Ce0.015Ga2.7Al2.3O12) wafer as a model structure for the future sampling detector geometry. We focused this study on the radioluminescence (RL) response of this composite material. We compare the results of two spin-coating methods, namely the static and the dynamic process, for the thin film preparation. We demonstrated enhanced RL intensity of both CsPbBr3 and GGAG:Ce scintillating constituents of a composite material. This synergic effect arises in both the RL spectra and decays, including decays in the short time window (50 ns). Consequently, this study confirms the applicability of CsPbBr3 nanocrystals as efficient time taggers for ultrafast timing applications, such as TOF-PET.
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Affiliation(s)
- Kateřina Děcká
- Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 115 19 Prague, Czech Republic; (J.K.); (V.Č.)
- Institute of Physics of the Czech Academy of Sciences, Cukrovarnická 10, 162 00 Prague, Czech Republic; (F.H.); (P.P.); (V.B.); (E.M.)
- Correspondence:
| | - Jan Král
- Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 115 19 Prague, Czech Republic; (J.K.); (V.Č.)
| | - František Hájek
- Institute of Physics of the Czech Academy of Sciences, Cukrovarnická 10, 162 00 Prague, Czech Republic; (F.H.); (P.P.); (V.B.); (E.M.)
- Department of Solid State Engineering, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 115 19 Prague, Czech Republic
| | - Petr Průša
- Institute of Physics of the Czech Academy of Sciences, Cukrovarnická 10, 162 00 Prague, Czech Republic; (F.H.); (P.P.); (V.B.); (E.M.)
- Department of Dosimetry and Application of Ionizing Radiation, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 115 19 Prague, Czech Republic
| | - Vladimir Babin
- Institute of Physics of the Czech Academy of Sciences, Cukrovarnická 10, 162 00 Prague, Czech Republic; (F.H.); (P.P.); (V.B.); (E.M.)
| | - Eva Mihóková
- Institute of Physics of the Czech Academy of Sciences, Cukrovarnická 10, 162 00 Prague, Czech Republic; (F.H.); (P.P.); (V.B.); (E.M.)
- Department of Solid State Engineering, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 115 19 Prague, Czech Republic
| | - Václav Čuba
- Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 115 19 Prague, Czech Republic; (J.K.); (V.Č.)
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Villa I, Santiago Gonzalez B, Orfano M, Cova F, Secchi V, Colombo C, Páterek J, Kučerková R, Babin V, Mauri M, Nikl M, Monguzzi A. The Sensitization of Scintillation in Polymeric Composites Based on Fluorescent Nanocomplexes. Nanomaterials (Basel) 2021; 11:nano11123387. [PMID: 34947738 PMCID: PMC8704871 DOI: 10.3390/nano11123387] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 12/05/2021] [Accepted: 12/09/2021] [Indexed: 11/16/2022]
Abstract
The sensitization of scintillation was investigated in crosslinked polymeric composite materials loaded with luminescent gold clusters aggregates acting as sensitizers, and with organic dye rhodamine 6G as the emitting species. The evolution in time of the excited states population in the systems is described by a set of coupled rate equations, in which steady state solution allowed obtainment of an expression of the sensitization efficacy as a function of the characteristic parameters of the employed luminescent systems. The results obtained indicate that the realization of sensitizer/emitter scintillating complexes is the strategy that must be pursued to maximize the sensitization effect in composite materials.
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Affiliation(s)
- Irene Villa
- Institute of Physics of the Czech Academy of Sciences, FZU, Cukrovarnická 10/112, 162 00 Prague, Czech Republic; (J.P.); (R.K.); (V.B.); (M.N.)
- Correspondence: (I.V.); (A.M.)
| | | | - Matteo Orfano
- Department of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milan, Italy; (M.O.); (F.C.); (V.S.); (C.C.); (M.M.)
| | - Francesca Cova
- Department of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milan, Italy; (M.O.); (F.C.); (V.S.); (C.C.); (M.M.)
| | - Valeria Secchi
- Department of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milan, Italy; (M.O.); (F.C.); (V.S.); (C.C.); (M.M.)
| | - Camilla Colombo
- Department of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milan, Italy; (M.O.); (F.C.); (V.S.); (C.C.); (M.M.)
| | - Juraj Páterek
- Institute of Physics of the Czech Academy of Sciences, FZU, Cukrovarnická 10/112, 162 00 Prague, Czech Republic; (J.P.); (R.K.); (V.B.); (M.N.)
- Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 115 19 Prague, Czech Republic
| | - Romana Kučerková
- Institute of Physics of the Czech Academy of Sciences, FZU, Cukrovarnická 10/112, 162 00 Prague, Czech Republic; (J.P.); (R.K.); (V.B.); (M.N.)
| | - Vladimir Babin
- Institute of Physics of the Czech Academy of Sciences, FZU, Cukrovarnická 10/112, 162 00 Prague, Czech Republic; (J.P.); (R.K.); (V.B.); (M.N.)
| | - Michele Mauri
- Department of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milan, Italy; (M.O.); (F.C.); (V.S.); (C.C.); (M.M.)
| | - Martin Nikl
- Institute of Physics of the Czech Academy of Sciences, FZU, Cukrovarnická 10/112, 162 00 Prague, Czech Republic; (J.P.); (R.K.); (V.B.); (M.N.)
| | - Angelo Monguzzi
- Department of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milan, Italy; (M.O.); (F.C.); (V.S.); (C.C.); (M.M.)
- Correspondence: (I.V.); (A.M.)
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Děcká K, Suchá A, Král J, Jakubec I, Nikl M, Jarý V, Babin V, Mihóková E, Čuba V. On the Role of Cs 4PbBr 6 Phase in the Luminescence Performance of Bright CsPbBr 3 Nanocrystals. Nanomaterials (Basel) 2021; 11:1935. [PMID: 34443766 PMCID: PMC8400622 DOI: 10.3390/nano11081935] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 07/21/2021] [Accepted: 07/22/2021] [Indexed: 11/16/2022]
Abstract
CsPbBr3 nanocrystals have been identified as a highly promising material for various optoelectronic applications. However, they tend to coexist with Cs4PbBr6 phase when the reaction conditions are not controlled carefully. It is therefore imperative to understand how the presence of this phase affects the luminescence performance of CsPbBr3 nanocrystals. We synthesized a mixed CsPbBr3-Cs4PbBr6 sample, and compared its photo- and radioluminescence properties, including timing characteristics, to the performance of pure CsPbBr3 nanocrystals. The possibility of energy transfer between the two phases was also explored. We demonstrated that the presence of Cs4PbBr6 causes significant drop in radioluminescence intensity of CsPbBr3 nanocrystals, which can limit possible future applications of Cs4PbBr6-CsPbBr3 mixtures or composites as scintillation detectors.
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Affiliation(s)
- Kateřina Děcká
- Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 115 19 Prague, Czech Republic; (A.S.); (J.K.); (V.Č.)
- Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10, 162 00 Prague, Czech Republic; (M.N.); (V.J.); (V.B.); (E.M.)
| | - Adéla Suchá
- Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 115 19 Prague, Czech Republic; (A.S.); (J.K.); (V.Č.)
| | - Jan Král
- Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 115 19 Prague, Czech Republic; (A.S.); (J.K.); (V.Č.)
| | - Ivo Jakubec
- Institute of Inorganic Chemistry, Czech Academy of Sciences, Husinec-Řež č.p. 1001, 250 68 Řež, Czech Republic;
| | - Martin Nikl
- Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10, 162 00 Prague, Czech Republic; (M.N.); (V.J.); (V.B.); (E.M.)
| | - Vítězslav Jarý
- Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10, 162 00 Prague, Czech Republic; (M.N.); (V.J.); (V.B.); (E.M.)
| | - Vladimir Babin
- Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10, 162 00 Prague, Czech Republic; (M.N.); (V.J.); (V.B.); (E.M.)
| | - Eva Mihóková
- Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10, 162 00 Prague, Czech Republic; (M.N.); (V.J.); (V.B.); (E.M.)
| | - Václav Čuba
- Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 115 19 Prague, Czech Republic; (A.S.); (J.K.); (V.Č.)
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Villa I, Villa C, Monguzzi A, Babin V, Tervoort E, Nikl M, Niederberger M, Torrente Y, Vedda A, Lauria A. Demonstration of cellular imaging by using luminescent and anti-cytotoxic europium-doped hafnia nanocrystals. Nanoscale 2018; 10:7933-7940. [PMID: 29671445 DOI: 10.1039/c8nr00724a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Luminescent nanoparticles are researched for their potential impact in medical science, but no materials approved for parenteral use have been available so far. To overcome this issue, we demonstrate that Eu3+-doped hafnium dioxide nanocrystals can be used as non-toxic, highly stable probes for cellular optical imaging and as radiosensitive materials for clinical treatment. Furthermore, viability and biocompatibility tests on artificially stressed cell cultures reveal their ability to buffer reactive oxygen species, proposing an anti-cytotoxic feature interesting for biomedical applications.
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Affiliation(s)
- Irene Villa
- Dipartimento di Scienza dei Materiali, Università degli Studi Milano Bicocca, via R. Cozzi 55, 20125 Milano, Italy.
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Dai Z, Liu Q, Toci G, Vannini M, Pirri A, Babin V, Nikl M, Wang W, Chen H, Li J. Fabrication and laser oscillation of Yb:Sc2O3 transparent ceramics from co-precipitated nano-powders. Ann Ital Chir 2018. [DOI: 10.1016/j.jeurceramsoc.2017.10.027] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Pirri A, Toci G, Li J, Xie T, Pan Y, Babin V, Beitlerova A, Nikl M, Vannini M. Spectroscopic and laser characterization of Yb 0.15:(Lu xY 1-x) 3Al 5O 12 ceramics with different Lu/Y balance. Opt Express 2016; 24:17832-17842. [PMID: 27505750 DOI: 10.1364/oe.24.017832] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report a broad comparative analysis of the spectroscopic and laser properties of solid solution Lutetium-Yttrium Aluminum Garnet (LuYAG, (LuxY1-x)3Al5O12) ceramics doped with Yb. The investigation was mainly aimed to assess the impact of the Lu/Y ratio on the Yb optical and laser properties. Therefore we analyzed a set of samples with different Y/Lu balance, namely 25/75, 50/50 and 75/25, with 15% Yb doping. We found that the Yb absorption and emission spectra changed from YAG to LuAG when gradually increasing in Lu content. Regarding the laser emission, remarkable results were achieved with all samples. Maximum output power was 8.2 W, 7.3 W and 8.7 W for Y/Lu balance 25/75, 50/50 and 75/25 respectively, at 1030 nm; the slope efficiency and the optical-to-optical efficiencies approached or exceeded 60% and 50% respectively. The tuning range was investigated using an intracavity ZnSe prism. The broadest tuning range (998 nm to 1063 nm) was obtained with Y/Lu balance 75/25, whereas the emission of the other two samples extended from 1000 nm to 1058 nm. To the best of our knowledge, this is the first comparative analysis of Yb:LuYAG ceramics or crystals as laser host across such a broad range of Y/Lu ratios.
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Tanaka C, Yokota Y, Kurosawa S, Yamaji A, Jary V, Babin V, Pejchal J, Ohashi Y, Kamada K, Nikl M, Yoshikawa A. Growth and radioluminescence of metal elements doped LiCaAlF6 single crystals for neutron scintillator. RADIAT MEAS 2016. [DOI: 10.1016/j.radmeas.2016.02.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Toci G, Pirri A, Li J, Xie T, Pan Y, Babin V, Beitlerova A, Nikl M, Vannini M. First laser emission of Yb 0.15:(Lu 0.5Y 0.5) 3Al 5O 12 ceramics. Opt Express 2016; 24:9611-9616. [PMID: 27137574 DOI: 10.1364/oe.24.009611] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report the first laser oscillation on Yb0.15:(Lu0.5Y0.5)3Al12 ceramics at room temperature. At 1030 nm we measured a maximum output power of 7.3 W with a corresponding slope efficiency of 55.4% by using an output coupler with a transmission of T = 39.2%. The spectroscopic properties are compared with those of the two parent garnets Yb:YAG and Yb:LuAG. To the best of our knowledge these are the first measurements reported in literature achieved with this new host.
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Pirri A, Toci G, Nikl M, Babin V, Vannini M. Experimental evidence of a nonlinear loss mechanism in highly doped Yb:LuAG crystal. Opt Express 2014; 22:4038-4049. [PMID: 24663725 DOI: 10.1364/oe.22.004038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report a rigorous study of the spectroscopic, laser and thermal properties of a 10at.% and a 15at.% Yb:LuAG crystals. A loss mechanism is observed in the medium with the highest doping, pumped at 936 nm and 968 nm, as a sharp and dramatic decrease of the laser output power is measured at higher excitation densities. The nonlinearity of the loss mechanism is confirmed by the fluorescence data and by the thermal lens. In particular, the dioptric power of the thermal lens acquired at different pumping levels shows a strong deviation of the expected linear trend. Here we report the influence of both the concentration and the ion excitation density of Yb3+ on the output powers, the slope efficiencies and the thresholds. Conversely excellent results are achieved with the 10at.%, which does not show any loss mechanism as at 1046 nm it delivers 11.8 W with a slope efficiency of η(s) = 82%, which is, to the best of our knowledge, the highest value reported in literature for this material.
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Babin V, Gorbenko V, Krasnikov A, Mihokova E, Nikl M, Zazubovich S, Zorenko Y. Photoluminescence and excited state structure in Bi3+-doped Y2SiO5 single crystalline films. RADIAT MEAS 2013. [DOI: 10.1016/j.radmeas.2013.04.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Nikl M, Kamada K, Kurosawa S, Yokota Y, Yoshikawa A, Pejchal J, Babin V. Luminescence and scintillation mechanism in Ce3+and Pr3+doped (Lu,Y,Gd)3(Ga,Al)5O12single crystal scintillators. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pssc.201200499] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Tolrà R, Vogel-Mikuš K, Hajiboland R, Kump P, Pongrac P, Kaulich B, Gianoncelli A, Babin V, Barceló J, Regvar M, Poschenrieder C. Localization of aluminium in tea (Camellia sinensis) leaves using low energy X-ray fluorescence spectro-microscopy. J Plant Res 2011; 124:165-72. [PMID: 20422247 DOI: 10.1007/s10265-010-0344-3] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2010] [Accepted: 03/25/2010] [Indexed: 05/25/2023]
Abstract
Information on localization of Al in tea leaf tissues is required in order to better understand Al tolerance mechanism in this Al-accumulating plant species. Here, we have used low-energy X-ray fluorescence spectro-microscopy (LEXRF) to study localization of Al and other low Z-elements, namely C, O, Mg, Si and P, in fully developed leaves of the tea plant [Camellia sinensis (L.) O. Kuntze]. Plants were grown from seeds for 3 months in a hydroponic solution, and then exposed to 200 microM AlCl(3) for 2 weeks. Epidermal-mesophyll and xylem phloem regions of 20 microm thick cryo-fixed freeze-dried tea-leaf cross-sections were raster scanned with 1.7 and 2.2 keV excitation energies to reach the Al-K and P-K absorption edges. Al was mainly localized in the cell walls of the leaf epidermal cells, while almost no Al signal was obtained from the leaf symplast. The results suggest that the retention of Al in epidermal leaf apoplast represent the main tolerance mechanism to Al in tea plants. In addition LEXRF proved to be a powerful tool for localization of Al in plant tissues, which can help in our understanding of the processes of Al uptake, transport and tolerance in plants.
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Affiliation(s)
- Roser Tolrà
- Laboratorio de Fisiología Vegetal, Facultad de Biociencias, Universidad Autónoma de Barcelona, 08193 Bellaterra, Spain
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Martincik J, Nikl M, Ishizu S, Fukuda K, Suyama T, Beitlerova A, Polak K, Babin V, Yoshikawa A. VUV-UV-visible luminescence of Nd3+, Er3+ and Tm3+ in LiLuF4 single crystal host. RADIAT MEAS 2010. [DOI: 10.1016/j.radmeas.2010.01.038] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Yanagida T, Kawaguchi N, Yokota Y, Ishidu S, Fukuda K, Yoshikawa A, Pejchal J, Nikl M, Babin V, Sekiya H, Kamada K. Study of VUV emission and γ-ray responses of Nd:BaF2 scintillaotor. RADIAT MEAS 2010. [DOI: 10.1016/j.radmeas.2009.12.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Babin V, Gorbenko V, Krasnikov A, Makhov A, Nikl M, Zazubovich S, Zorenko Y. Photoluminescence of Lu3Al5O12:Bi and Y3Al5O12:Bi single crystalline films. RADIAT MEAS 2010. [DOI: 10.1016/j.radmeas.2009.12.012] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Babin V, Gorbenko V, Krasnikov A, Makhov A, Nikl M, Polak K, Zazubovich S, Zorenko Y. Peculiarities of excited state structure and photoluminescence in Bi(3+)-doped Lu(3)Al(5)O(12) single-crystalline films. J Phys Condens Matter 2009; 21:415502. [PMID: 21693989 DOI: 10.1088/0953-8984/21/41/415502] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Single-crystalline films of Lu(3)Al(5)O(12):Bi, prepared by the liquid phase epitaxy method from the melt-solution based on Bi(2)O(3) flux, have been studied at 4.2-400 K by time-resolved luminescence spectroscopy methods. Their emission spectra consist of two types of bands with strongly different characteristics. The ultraviolet emission band consists of two components, arising from the electronic transitions which correspond to the [Formula: see text] and [Formula: see text] transitions in a free Bi(3+) ion. At low temperatures, mainly the lower-energy component of this emission is observed, having the decay time∼10(-3) s at T<100 K and arising from the metastable (3)P(0) level. At T>100 K, the higher-energy emission component appears, arising from the thermally populated emitting (3)P(1) level. The visible emission spectrum consists of two dominant strongly overlapped broad bands with large Stokes shifts. At 4.2 K, their decay times are ∼10(-5) s and decrease with increasing temperature. Both of the visible emission bands are assumed to have an exciton origin. The lower-energy band is ascribed to an exciton, localized near a single Bi(3+) ion. The higher-energy band shows a stronger intensity dependence on the Bi(3+) content and is assumed to arise from an exciton localized near a dimer Bi(3+) center. The origin and structure of the corresponding excited states is considered and the processes, taking place in the excited states, are discussed.
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Affiliation(s)
- V Babin
- Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia
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Duan CK, Tanner PA, Meijerink A, Babin V. Synchrotron excitation, emission and theoretical simulation of lanthanide ions in hexachloroelpasolite crystals. J Phys Condens Matter 2009; 21:395501. [PMID: 21832389 DOI: 10.1088/0953-8984/21/39/395501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Emission and excitation spectra of Cs(2)NaLnCl(6) (Ln = Y, Eu, Gd, Er, Yb), Cs(2)NaYCl(6):Ce and Cs(2)NaYCl(6):Tm have been recorded using synchrotron radiation. With the possible exception of the case for Ce(3+), no [Formula: see text] transitions are observed and the emission spectra are entirely assigned to [Formula: see text] intraconfigurational transitions of Ln(3+) in LnCl(6)(3-) and impurity species. The excitation spectra comprise intraconfigurational, charge transfer and band-to-band transitions. Trace impurities of oxy-species or of other lanthanide ions have a profound effect upon the spectra. The 4f-5d absorption spectra have been simulated by employing the suite of programs of Professor M F Reid and the results have been included together with the experimental spectra.
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Affiliation(s)
- Chang-Kui Duan
- Institute of Modern Physics, Chongqing University of Post and Telecommunications, Chongqing 400065, People's Republic of China. Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, People's Republic of China
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Babin V, Gorbenko V, Makhov A, Nikl M, Zazubovich S, Zorenko Y. The role of Pb2+ ions in the luminescence of LuAG:Ce single crystalline films. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/pssc.200673814] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Abstract
Condensation of a spherically symmetric submicrometer size vapor bubble is studied using diffuse interface hydrodynamic model supplemented by the van der Waals equation of state with parameters characteristic for argon. The bubble, surrounded by liquid, is held in a container of constant volume with temperature of the wall kept fixed. The condensation is triggered by a sudden rise of the wall temperature. We find that in the same container and subjected to a similar increase of the wall temperature the condensation process is totally different from the opposite process of droplet evaporation. In particular, the rapid change of the wall temperature excites the wave, which hits the interface and compresses the bubble, leading to a considerable increase of the temperature inside. The condensation of the submicrometer size bubble takes tens of nanoseconds, whereas evaporation of the same size droplet lasts roughly 50 times longer. In contrast to evaporation the condensation process is hardly quasistationary.
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Affiliation(s)
- V Babin
- Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw.
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Abstract
Evaporation of a spherically symmetric sub-micrometer size liquid droplet is studied using a diffuse interface hydrodynamic model supplemented by the van der Waals equation of state with parameters characteristic for argon. The droplet, surrounded by saturated vapor, is held in a container with the temperature of the walls kept fixed. The evaporation is triggered by a sudden rise of the temperature of the walls. Time and space evolution of the basic thermodynamic quantities is presented. The time and space scales studied range from picoseconds to microseconds and from nanometers to micrometers, respectively. We find that the temperature and chemical potential are both continuous at the interface on the scale larger than the interfacial width. We find that at long times the radius R of the droplet changes with time t as R(2)(t) = R(2)(0) - 2tkappa(v)(T(w) - T(l))/ln(l), where kappa(v) is the heat conductivity of the vapor, n(l) and T(l) are the density and the temperature of liquid inside the droplet, respectively, l is the latent heat of transition per molecule, and T(w) is the temperature of the ambient vapor.
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Affiliation(s)
- V Babin
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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Cybulski O, Babin V, Hołyst R. Minimization of the Renyi entropy production in the space-partitioning process. Phys Rev E Stat Nonlin Soft Matter Phys 2005; 71:046130. [PMID: 15903749 DOI: 10.1103/physreve.71.046130] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2004] [Indexed: 05/02/2023]
Abstract
The spontaneous division of space in Fleming-Viot processes is studied in terms of non-extensive thermodynamics. We analyze a system of n different types of Brownian particles confined in a box. Particles of different types annihilate each other when they come into close contact. Each process of annihilation is accompanied by a simultaneous nucleation of a particle of the same type, so that the number of particles of each component remains constant. The system eventually reaches a stationary state, in which the available space is divided into n separate subregions, each occupied by particles of one type. Within each subregion, the particle density distribution minimizes the Renyi entropy production. We show that the sum of these entropy productions in the stationary state is also minimized, i.e., the resulting boundaries between different components adopt a configuration which minimizes the total entropy production. The evolution of the system leads to decreasing of the total entropy production monotonically in time, irrespective of the initial conditions. In some circumstances, the stationary state is not unique-the entropy production may have several local minima for different configurations. In the case of a rectangular box, the existence and stability of different stationary states are studied as a function of the aspect ratio of the rectangle.
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Affiliation(s)
- O Cybulski
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
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Abstract
Evaporation of a thin (submicrometer size) liquid film confined between two solid substrates is studied using diffuse interface hydrodynamic model supplemented by the van der Waals equation of state. The time and space evolution of the basic thermodynamic quantities such as temperature, density, entropy, chemical potential, and entropy production is presented. The values of numerical parameters chosen correspond to those of argon. The time and space scales studied range from picoseconds to microseconds and from nanometers to micrometers correspondingly.
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Affiliation(s)
- V Babin
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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Babin V, Blazek K, Krasnikov A, Nejezchleb K, Nikl M, Savikhina T, Zazubovich S. Luminescence of undoped LuAG and YAG crystals. ACTA ACUST UNITED AC 2005. [DOI: 10.1002/pssc.200460120] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Babin V, Bohacek P, Bender E, Krasnikov A, Mihokova E, Nikl M, Senguttuvan N, Stolovits A, Usuki Y, Zazubovich S. Decay kinetics of the green emission in tungstates and molybdates. RADIAT MEAS 2004. [DOI: 10.1016/j.radmeas.2004.02.005] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Babin V, Krasnikov A, Mares JA, Nikl M, Nitsch K, Solovieva N, Zazubovich S. Luminescence spectroscopy of theGd-rich Ce3-, Tb3- and Mn2-doped phosphate glasses. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/pssa.200306449] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Fazio E, Babin V, Bertolotti M, Vlad V. Solitonlike propagation in photorefractive crystals with large optical activity and absorption. Phys Rev E Stat Nonlin Soft Matter Phys 2002; 66:016605. [PMID: 12241498 DOI: 10.1103/physreve.66.016605] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2001] [Indexed: 11/07/2022]
Abstract
We have found analytical solutions of the light propagation equations in photorefractive materials with strong optical activity and absorption. These solutions show the occurrence of breathing solitons in sillenite crystals with strong optical activity and absorption in two particular orientations with respect to the external electric field. The absorption is decreasing the soliton intensity with the propagation distance (which set a limit in the soliton channel length), is increasing the breathing period, and is changing the soliton width (in inverse relations, at low and high intensities). Our experimental results confirm the analytical solutions and the numerical simulations, as well as the importance of the optical activity and absorption in solitonlike propagation.
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Affiliation(s)
- E Fazio
- Università degli Studi di Roma La Sapienza and INFM Dipartimento di Energetica, via Scarpa 16, I-00161 Roma, Italy
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Nikl M, Mares J, Mihokova E, Nitsch K, Solovieva N, Babin V, Krasnikov A, Zazubovich S, Martini M, Vedda A, Fabeni P, Pazzi G, Baccaro S. Radio- and thermoluminescence and energy transfer processes in Ce3+(Tb3+)-doped phosphate scintillating glasses. RADIAT MEAS 2001. [DOI: 10.1016/s1350-4487(01)00065-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Babin V, Fabeni P, Nikl M, Pazzi G, Sildos I, Zazubovich N, Zazubovich S. Polarized luminescence of CsPbBr3 nanocrystals (quantum dots) in CsBr:Pb single crystal. Chem Phys Lett 1999. [DOI: 10.1016/s0009-2614(99)01110-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Babin V, Fabeni P, Kalder K, Nikl M, Pazzi G, Zazubovich S. Photo- and thermally stimulated luminescence and defects in UV-irradiated CsI:Tl and CsI:Pb crystals. RADIAT MEAS 1998. [DOI: 10.1016/s1350-4487(98)00053-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Fromard L, Babin V, Fleurat-Lessard P, Fromont JC, Serrano R, Bonnemain JL. Control of Vascular Sap pH by the Vessel-Associated Cells in Woody Species (Physiological and Immunological Studies). Plant Physiol 1995; 108:913-918. [PMID: 12228516 PMCID: PMC157440 DOI: 10.1104/pp.108.3.913] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In Robinia wood, the vessel-associated cells form a continuous sleeve around the vessels. Variations in pH of the solution perfused through the vessels during the annual cycle and the opposing effects of carbonyl cyanide-m-chlorophenylhydrazone and fusicoccin on this pH value indicate that some living cells of the wood are involved in the control of vascular sap pH and that this control fluctuates with the seasons. The immunolocalization of the plasma membrane HT+-ATPase in Robinia wood was studied by the immunogold-silver-staining technique using an antibody raised against a conserved stretch of the cytoplasmic domain of the H+-ATPase. The immunostaining is much stronger in vessel-associated cells than in other living cell types (ray and axial parenchyma elements) of the secondary xylem. Our data show an efficient involvement of this cell type in the control of vascular sap pH.
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Affiliation(s)
- L. Fromard
- Laboratoire de Physiologie et Biochimie Vegetales (Unite de Recherche Associee au Centre National de la Recherche Scientifique 574), Universite de Poitiers, 25 rue du Faubourg Saint-Cyprien, 86000 Poitiers, France (L.F., V.B., P.F.-L., J.-C.F., J.-L.B.)
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