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Ko B, Ahn J, Song SH. pH-Dependent Photophysical Properties of Metallic Phase MoSe 2 Quantum Dots. Materials (Basel) 2022; 15:ma15144945. [PMID: 35888412 PMCID: PMC9318461 DOI: 10.3390/ma15144945] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 06/30/2022] [Accepted: 07/14/2022] [Indexed: 12/10/2022]
Abstract
Fluorescence properties of quantum dots (QDs) are critically affected by their redox states, which is important for practical applications. In this study, we investigated the optical properties of MoSe2-metallic phase quantum-dots (MoSe2-mQDs) depending on the pH variation, in which the MoSe2-mQDs were dispersed in water with two sizes (Φ~3 nm and 12 nm). The larger MoSe2-mQDs exhibited a large red-shift and broadening of photoluminescence (PL) peak with a constant UV absorption spectra as varying the pH, while the smaller ones showed a small red-shift and peak broadening, but discrete absorption bands in the acidic solution. The excitation wavelength-dependent photoluminescence shows that the PL properties of smaller MoSe2-mQDs are more sensitive to the pH change compared to those of larger ones. From the time-resolved PL spectroscopy, the excitons dominantly decaying with an energy of ~3 eV in pH 2 clearly show the shift of PL peak to the lower energy (~2.6 eV) as the pH increases to 7 and 11 in the smaller MoSe2-mQDs. On the other hand, in the larger MoSe2-mQDs, the exciton decay is less sensitive to the redox states compared to those of the smaller ones. This result shows that the pH variation is more critical to the change of photophysical properties than the size effect in MoSe2-mQDs.
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Hrachowina L, Anttu N, Borgström MT. Wafer-Scale Synthesis and Optical Characterization of InP Nanowire Arrays for Solar Cells. Nano Lett 2021; 21:7347-7353. [PMID: 34449221 PMCID: PMC8431724 DOI: 10.1021/acs.nanolett.1c02542] [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] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 08/19/2021] [Indexed: 06/13/2023]
Abstract
Nanowire solar cells have the potential to reach the same efficiencies as the world-record III-V solar cells while using a fraction of the material. For solar energy harvesting, large-area nanowire solar cells have to be processed. In this work, we demonstrate the synthesis of epitaxial InP nanowire arrays on a 2 inch wafer. We define five array areas with different nanowire diameters on the same wafer. We use a photoluminescence mapper to characterize the sample optically and compare it to a homogeneously exposed reference wafer. Both steady-state and time-resolved photoluminescence maps are used to study the material's quality. From a mapping of reflectance spectra, we simultaneously extract the diameter and length of the nanowires over the full wafer. The extracted knowledge of large-scale nanowire synthesis will be crucial for the upscaling of nanowire-based solar cells, and the demonstrated wafer-scale characterization methods will be central for quality control during manufacturing.
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Affiliation(s)
- Lukas Hrachowina
- NanoLund
and Division of Solid State Physics, Lund
University, Box 118, 221 00 Lund, Sweden
| | - Nicklas Anttu
- Physics,
Faculty of Science and Engineering, Åbo
Akademi University, FI-20500 Turku, Finland
- Department
of Electronics and Nanoengineering, Aalto
University, P.O. Box 13500, FI-00076 Aalto, Finland
| | - Magnus T. Borgström
- NanoLund
and Division of Solid State Physics, Lund
University, Box 118, 221 00 Lund, Sweden
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Devesa S, Rodrigues J, Teixeira SS, Rooney AP, Graça MPF, Cooper D, Monteiro T, Costa LC. Tuning Green to Red Color in Erbium Niobate Micro- and Nanoparticles. Nanomaterials (Basel) 2021; 11:nano11030660. [PMID: 33800356 PMCID: PMC7998491 DOI: 10.3390/nano11030660] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 02/12/2021] [Revised: 02/26/2021] [Accepted: 03/01/2021] [Indexed: 11/16/2022]
Abstract
Tetragonal Er0.5Nb0.5O2 and monoclinic ErNbO4 micro- and nanoparticles were prepared by the citrate sol–gel method and heat-treated at temperatures between 700 and 1600 °C. ErNbO4 revealed a spherical-shaped crystallite, whose size increased with heat treatment temperatures. To assess their optical properties at room temperature (RT), a thorough spectroscopic study was conducted. RT photoluminescence (PL) spectroscopy revealed that Er3+ optical activation was achieved in all samples. The photoluminescence spectra show the green/yellow 2H11/2, 4S3/2→4I15/2 and red 4F9/2→4I15/2 intraionic transitions as the main visible recombination, with the number of the crystal field splitting Er3+ multiplets reflecting the ion site symmetry in the crystalline phases. PL excitation allows the identification of Er3+ high-energy excited multiplets as the preferential population paths of the emitting levels. Independently of the crystalline structure, the intensity ratio between the green/yellow and red intraionic transitions was found to be strongly sensitive to the excitation energy. After pumping the samples with a resonant excitation into the 4G11/2 excited multiplet, a green/yellow transition stronger than the red one was observed, whereas the reverse occurred for higher excitation photon energies. Thus, a controllable selective excited tunable green to red color was achieved, which endows new opportunities for photonic and optoelectronic applications.
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Affiliation(s)
- Susana Devesa
- Centre for Physics University of Coimbra (CFisUC), Physics Department, University of Coimbra, Rua Larga, 3004-516 Coimbra, Portugal
- i3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal; (S.S.T.); (M.P.F.G.)
- Correspondence: (S.D.); (J.R.); (T.M.); (L.C.C.); Tel.: +351-234-370-944 (S.D.); +351-234-247-261 (J.R.); +351-234-370-824 (T.M.); +351-234-370-944 (L.C.C.)
| | - Joana Rodrigues
- i3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal; (S.S.T.); (M.P.F.G.)
- Correspondence: (S.D.); (J.R.); (T.M.); (L.C.C.); Tel.: +351-234-370-944 (S.D.); +351-234-247-261 (J.R.); +351-234-370-824 (T.M.); +351-234-370-944 (L.C.C.)
| | - Sílvia Soreto Teixeira
- i3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal; (S.S.T.); (M.P.F.G.)
| | - Aidan P. Rooney
- CEA LETI-Minatec, 17 Rue des Martyrs, 38054 Grenoble CEDEX 9, France; (A.P.R.); (D.C.)
| | - Manuel P. F. Graça
- i3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal; (S.S.T.); (M.P.F.G.)
| | - David Cooper
- CEA LETI-Minatec, 17 Rue des Martyrs, 38054 Grenoble CEDEX 9, France; (A.P.R.); (D.C.)
| | - Teresa Monteiro
- i3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal; (S.S.T.); (M.P.F.G.)
- Correspondence: (S.D.); (J.R.); (T.M.); (L.C.C.); Tel.: +351-234-370-944 (S.D.); +351-234-247-261 (J.R.); +351-234-370-824 (T.M.); +351-234-370-944 (L.C.C.)
| | - Luís C. Costa
- i3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal; (S.S.T.); (M.P.F.G.)
- Correspondence: (S.D.); (J.R.); (T.M.); (L.C.C.); Tel.: +351-234-370-944 (S.D.); +351-234-247-261 (J.R.); +351-234-370-824 (T.M.); +351-234-370-944 (L.C.C.)
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Gies S, Schömann EM, Anna Prume J, Koch M. Exploring the Potential of Time-Resolved Photoluminescence Spectroscopy for the Detection of Plastics. Appl Spectrosc 2020; 74:1161-1166. [PMID: 32436393 DOI: 10.1177/0003702820933282] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Accurate data on microplastic occurrence in aquatic and terrestrial ecosystems are a basic requirement for microplastic risk assessment and management. Existing analysis techniques like Raman spectroscopy and Fourier transform infrared (FT-IR) spectroscopy imaging are still time-consuming and depend on laborious sample preparation. Therefore, we investigate the potential of time-resolved photoluminescence spectroscopy as an alternative technique to identify plastic materials, and, for the first time determine the photoluminescence lifetime of a series of polymers and several non-plastic samples typically found in a marine environment. The obtained photoluminescence lifetimes can be used to distinguish between plastic and natural materials. Furthermore, they allow us to identify distinct types of plastics. Therefore, the described approach has the potential to identify materials either as a stand-alone technique or for pre-characterization of sample materials for otherwise time-consuming analytical methods such as Raman spectroscopy or FT-IR spectroscopy.
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Affiliation(s)
- Sebastian Gies
- Department of Physics, Philipps-University Marburg, Marburg, Germany
| | | | - Julia Anna Prume
- Department of Physics, Philipps-University Marburg, Marburg, Germany
| | - Martin Koch
- Department of Physics, Philipps-University Marburg, Marburg, Germany
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Li Z, Wang T, Lu Z, Khatoniar M, Lian Z, Meng Y, Blei M, Taniguchi T, Watanabe K, McGill SA, Tongay S, Menon VM, Smirnov D, Shi SF. Direct Observation of Gate-Tunable Dark Trions in Monolayer WSe 2. Nano Lett 2019; 19:6886-6893. [PMID: 31487988 DOI: 10.1021/acs.nanolett.9b02132] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Spin-forbidden intravalley dark excitons in tungsten-based transition-metal dichalcogenides (TMDCs), because of their unique spin texture and long lifetime, have attracted intense research interest. Here, we show that we can control the dark exciton electrostatically by dressing it with one free electron or free hole, forming the dark trions. The existence of the dark trions is suggested by the unique magneto-photoluminescence spectroscopy pattern of the boron nitride (BN)-encapsulated monolayer WSe2 device at low temperature. The unambiguous evidence of the dark trions is further obtained by directly resolving the radiation pattern of the dark trions through back focal plane imaging. The dark trions possess a binding energy of ∼15 meV, and they inherit the long lifetime and large g-factor from the dark exciton. Interestingly, under the out-of-plane magnetic field, dressing the dark exciton with one free electron or hole results in distinctively different valley polarization of the emitted photon, as a result of the different intervalley scattering mechanism for the electron and hole. Finally, the lifetime of the positive dark trion can be further tuned from ∼50 ps to ∼215 ps by controlling the gate voltage. The gate-tunable dark trions usher in new opportunities for excitonic optoelectronics and valleytronics.
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Affiliation(s)
- Zhipeng Li
- Department of Chemical and Biological Engineering , Rensselaer Polytechnic Institute , Troy , New York 12180 , United States
| | - Tianmeng Wang
- Department of Chemical and Biological Engineering , Rensselaer Polytechnic Institute , Troy , New York 12180 , United States
| | - Zhengguang Lu
- National High Magnetic Field Lab , Tallahassee , Florida 32310 , United States
- Department of Physics , Florida State University , Tallahassee , Florida 32306 , United States
| | - Mandeep Khatoniar
- Department of Physics, City College of New York , City University of New York , 160 Convent Ave. , New York , New York 10031 , United States
- Department of Physics, The Graduate Center , City University of New York , 365 Fifth Ave. , New York , New York 10016 , United States
| | - Zhen Lian
- Department of Chemical and Biological Engineering , Rensselaer Polytechnic Institute , Troy , New York 12180 , United States
| | - Yuze Meng
- Department of Chemical and Biological Engineering , Rensselaer Polytechnic Institute , Troy , New York 12180 , United States
| | - Mark Blei
- School for Engineering of Matter, Transport and Energy , Arizona State University , Tempe , Arizona 85287 , United States
| | - Takashi Taniguchi
- National Institute for Materials Science , 1-1 Namiki , Tsukuba 305-0044 , Japan
| | - Kenji Watanabe
- National Institute for Materials Science , 1-1 Namiki , Tsukuba 305-0044 , Japan
| | - Stephen A McGill
- National High Magnetic Field Lab , Tallahassee , Florida 32310 , United States
| | - Sefaattin Tongay
- School for Engineering of Matter, Transport and Energy , Arizona State University , Tempe , Arizona 85287 , United States
| | - Vinod M Menon
- Department of Physics, City College of New York , City University of New York , 160 Convent Ave. , New York , New York 10031 , United States
- Department of Physics, The Graduate Center , City University of New York , 365 Fifth Ave. , New York , New York 10016 , United States
| | - Dmitry Smirnov
- National High Magnetic Field Lab , Tallahassee , Florida 32310 , United States
| | - Su-Fei Shi
- Department of Chemical and Biological Engineering , Rensselaer Polytechnic Institute , Troy , New York 12180 , United States
- Department of Electrical, Computer & Systems Engineering , Rensselaer Polytechnic Institute , Troy , New York 12180 , United States
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Li F, Lu J, Zhang Q, Peng D, Yang Z, Xu Q, Pan C, Pan A, Li T, Wang R. Controlled fabrication, lasing behavior and excitonic recombination dynamics in single crystal CH 3NH 3PbBr 3 perovskite cuboids. Sci Bull (Beijing) 2019; 64:698-704. [PMID: 36659652 DOI: 10.1016/j.scib.2019.04.016] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 02/27/2019] [Accepted: 03/28/2019] [Indexed: 01/21/2023]
Abstract
As a direct bandgap semiconductor, organic-inorganic lead halide perovskite (MAPbX3, MA = CH3NH3, X = Cl, Br, I) have been considered as promising materials for laser due to their excellent optoelectronic properties. The perovskite materials with 1D and 2D shapes were widely prepared and studied for Fabry-Pérot mode and whispering-gallery-mode (WGM) microcavities, but cuboid-shape is rarely reported. In this work, we successfully fabricated single crystal cuboid-shaped MAPbBr3 perovskite with different morphologies, named microcuboid-MAPbBr3 (M-MAPbBr3) and multi-step-MAPbBr3 (MS-MAPbBr3), via solvothermal method. Furthermore, the as-prepared crystals' excitonic recombination lifetime under different pumping energy density was studied by time-resolved photoluminescence (TRPL). Based on controllable morphology and remarkable lasing properties, these cuboid shaped single crystal perovskite could be a promising candidate for small laser, and other optoelectronic devices.
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Affiliation(s)
- Fangtao Li
- Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China; CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China
| | - Junfeng Lu
- CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China; School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qinglin Zhang
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education, College of Materials and Engineering, Hunan University, Changsha 410082, China
| | - Dengfeng Peng
- College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Zheng Yang
- CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China; School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qian Xu
- CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China; School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Caofeng Pan
- CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China; School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, China; College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
| | - Anlian Pan
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education, College of Materials and Engineering, Hunan University, Changsha 410082, China.
| | - Tianfeng Li
- School of Physics and Electronics, Henan University, Kaifeng 475004, China.
| | - Rongming Wang
- Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China.
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Schopf K, Huber A. Membrane protein trafficking in Drosophila photoreceptor cells. Eur J Cell Biol 2016; 96:391-401. [PMID: 27964885 DOI: 10.1016/j.ejcb.2016.11.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 11/21/2016] [Accepted: 11/28/2016] [Indexed: 10/20/2022] Open
Abstract
Membrane protein trafficking occurs throughout the lifetime of neurons and includes the initial protein synthesis and anterograde transport to the plasma membrane as well as internalization, degradation, and recycling of plasma membrane proteins. Defects in protein trafficking can result in neuronal degeneration and underlie blinding diseases such as retinitis pigmentosa as well as other neuronal disorders. Drosophila photoreceptor cells have emerged as a model system for identifying the components and mechanisms involved in membrane protein trafficking in neurons. Here we summarize the current knowledge about trafficking of three Drosophila phototransduction proteins, the visual pigment rhodopsin and the two light-activated ion channels TRP (transient receptor potential) and TRPL (TRP-like). Despite some common requirements shared by rhodopsin and TRP, details in the trafficking of these proteins differ considerably, suggesting the existence of several trafficking pathways for these photoreceptor proteins.
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Affiliation(s)
- Krystina Schopf
- University of Hohenheim, Institute of Physiology, Department of Biosensorics, Stuttgart, Germany
| | - Armin Huber
- University of Hohenheim, Institute of Physiology, Department of Biosensorics, Stuttgart, Germany.
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Xu Y, Wang T. CULD is required for rhodopsin and TRPL channel endocytic trafficking and survival of photoreceptor cells. J Cell Sci 2015; 129:394-405. [PMID: 26598556 PMCID: PMC4732287 DOI: 10.1242/jcs.178764] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Accepted: 11/18/2015] [Indexed: 01/19/2023] Open
Abstract
Endocytosis of G-protein-coupled receptors (GPCRs) and associated channels contributes to desensitization and adaptation of a variety of signaling cascades. In Drosophila melanogaster, the main light-sensing rhodopsin (Rh1; encoded by ninaE) and the downstream ion channel, transient receptor potential like (TRPL), are endocytosed in response to light, but the mechanism is unclear. By using an RNA-Sequencing (RNA-Seq) approach, we discovered a protein we named CULD, a photoreceptor-cell enriched CUB- and LDLa-domain transmembrane protein, that is required for endocytic trafficking of Rh1 and TRPL. CULD localized to endocytic Rh1-positive or TRPL-positive vesicles. Mutations in culd resulted in the accumulation of Rh1 and TRPL within endocytic vesicles, and disrupted the regular turnover of endocytic Rh1 and TRPL. In addition, loss of CULD induced light- and age-dependent retinal degeneration, and reduced levels of Rh1, but not of TRPL, suppressed retinal degeneration in culd-null mutant flies. Our data demonstrate that CULD plays an important role in the endocytic turnover of Rh1 and TRPL, and suggest that CULD-dependent rhodopsin endocytic trafficking is required for maintaining photoreceptor integrity.
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Affiliation(s)
- Ying Xu
- School of Life Sciences, Beijing Normal University, Beijing, China, 100875 National Institute of Biological Sciences, Beijing, China, 102206
| | - Tao Wang
- National Institute of Biological Sciences, Beijing, China, 102206
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