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Romero M, Sánchez-Valencia JR, Lozano G, Míguez H. Effect of the effective refractive index on the radiative decay rate in nanoparticle thin films. NANOSCALE 2023; 15:15279-15287. [PMID: 37676237 DOI: 10.1039/d3nr03348a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/08/2023]
Abstract
In this work, we theoretically and experimentally study the influence of the optical environment on the radiative decay rate of rare-earth transitions in luminescent nanoparticles forming a thin film. We use electric dipole sources in finite-difference time-domain simulations to analyze the effect of modifying the effective refractive index of transparent layers made of phosphor nanocrystals doped with rare earth cations, and propose a correction to previously reported analytical models for calculating the radiative decay rate. Our predictions are tested against an experimental realization of such luminescent films, in which we manage to vary the effective refractive index in a gradual and controllable manner. Our model accurately accounts for the measurements attained, allows us to discriminate the radiative and non-radiative contributions to the time-resolved photoluminescence, and provides a way to rationally tune the spontaneous decay rate and hence the photoluminescence quantum yield in an ensemble of luminescent nanoparticles.
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Affiliation(s)
- Manuel Romero
- Institute of Materials Science of Seville, Spanish National Research Council - University of Seville, C. Américo Vespucio 49, 41092, Seville, Spain.
| | - Juan Ramón Sánchez-Valencia
- Institute of Materials Science of Seville, Spanish National Research Council - University of Seville, C. Américo Vespucio 49, 41092, Seville, Spain.
| | - Gabriel Lozano
- Institute of Materials Science of Seville, Spanish National Research Council - University of Seville, C. Américo Vespucio 49, 41092, Seville, Spain.
| | - Hernán Míguez
- Institute of Materials Science of Seville, Spanish National Research Council - University of Seville, C. Américo Vespucio 49, 41092, Seville, Spain.
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2
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Cabello-Olmo E, Higashino M, Murai S, Tanaka K, Lozano G, Míguez H. Collective plasmonic resonances enhance the photoluminescence of rare-earth nanocrystal films processed by ultrafast annealing. Chem Commun (Camb) 2023; 59:1289-1292. [PMID: 36645116 PMCID: PMC9890481 DOI: 10.1039/d2cc04779a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Herein, we demonstrate that rapid thermal annealing allows achieving close-to-one photoluminescence quantum yield while preserving the transparency of rare-earth nanocrystal films, which further enables their integration with nanophotonics. The combination with periodic arrays of aluminum nanodisks that support collective plasmonic resonances leads to enhanced directional emission.
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Affiliation(s)
- Elena Cabello-Olmo
- Instituto de Ciencia de Materiales Sevilla, Consejo Superior de Investigaciones Científicas-Universidad de SevillaAmerico Vespucio 4941092Spain
| | - Makoto Higashino
- Department of Material Chemistry, Graduate School of Engineering, Kyoto UniversityKatsura, Nishikyo-kuKyoto 615-8510Japan
| | - Shunsuke Murai
- Department of Material Chemistry, Graduate School of Engineering, Kyoto UniversityKatsura, Nishikyo-kuKyoto 615-8510Japan
| | - Katsuhisa Tanaka
- Department of Material Chemistry, Graduate School of Engineering, Kyoto UniversityKatsura, Nishikyo-kuKyoto 615-8510Japan
| | - Gabriel Lozano
- Instituto de Ciencia de Materiales Sevilla, Consejo Superior de Investigaciones Científicas-Universidad de SevillaAmerico Vespucio 4941092Spain
| | - Hernán Míguez
- Instituto de Ciencia de Materiales Sevilla, Consejo Superior de Investigaciones Científicas-Universidad de SevillaAmerico Vespucio 4941092Spain
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3
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Viaña JM, Romero M, Lozano G, Míguez H. Nanoantennas Patterned by Colloidal Lithography for Enhanced Nanophosphor Light Emission. ACS APPLIED NANO MATERIALS 2022; 5:16242-16249. [PMID: 36466302 PMCID: PMC9706497 DOI: 10.1021/acsanm.2c03258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Accepted: 10/18/2022] [Indexed: 06/17/2023]
Abstract
Transparent coatings made of rare-earth doped nanocrystals, also known as nanophosphors, feature efficient photoluminescence and excellent thermal and optical stability. Herein, we demonstrate that the optical antennas prepared by colloidal lithography render thin nanophosphor films with a brighter emission. In particular, we fabricate gold nanostructures in the proximity of GdVO4:Eu3+ nanophosphors by metal evaporation using a mask made of a monolayer of polymer beads arranged in a triangular lattice. Optical modes supported by the antennas can be controlled by tuning the diameter of the polymer spheres in the colloidal mask, which determines the shape of the gold nanostructure, as confirmed by numerical simulations. Confocal microscopy reveals that metallic antennas induce brighter photoluminescence at specific spatial regions of the nanophosphor film at targeted frequencies as a result of the coupling between gold nanostructures and nanophosphors. Patterning of nanophosphor thin layers with arrays of metallic antennas offers an inexpensive nanophotonic solution to develop bright emitting coatings of interest for color conversion, labeling, or anti-counterfeiting.
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Zhang H, Chen T, Qin S, Huang J, Wu X. Fabrication of REVO4 films via sacrificial conversion from Layered rare-earth hydroxides (LRHs) films: the investigation of the transition mechanism and their photoluminescence. Dalton Trans 2022; 51:5577-5586. [DOI: 10.1039/d1dt03724b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The rare-earth orthovanadate REVO4 (RE = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, and Y) films were directly synthesized within 2 hours by sacrificial conversion from the electrodeposited...
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5
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Mariscal-Jiménez A, Tarazaga Martín-Luengo A, Galiana B, Ballesteros C, Bonanni A, Martín-Sánchez J, Serna R. Photoluminescence and Stoichiometry Correlation in Nanocrystalline EuO x Thin Films: Tunable Color Emission. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2020; 124:15434-15439. [PMID: 32704340 PMCID: PMC7370298 DOI: 10.1021/acs.jpcc.0c03052] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 06/02/2020] [Indexed: 06/11/2023]
Abstract
The development of broadband and ultracompact optoelectronic devices relies on the possibility of fabricating bright and tunable emitters at the nanoscale. Here, we show emission from EuO x (1 ≤ x < 1.4) thin films on silicon formed by nanocrystals with average sizes in the range of 5 nm. The photoluminescence emission of the nano-EuO x films is tunable as a function of the oxygen concentration changing from a green broadband Eu2+-related emission to a narrow red Eu3+-related emission. To reach these results has been instrumental through the use of a new methodology specially designed to achieve high-quality europium oxide films whose compositional properties are controlled by the growth base pressure and preserved thanks to a chemically stable and transparent cover layer of Al2O3. Our findings confirm the outstanding potential of nanostructured EuO x films as "one-compound" optical elements with tunable emission properties for their implementation in integrated silicon-based devices.
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Affiliation(s)
- Antonio Mariscal-Jiménez
- Laser
Processing Group, Instituto de Óptica,
IO-CSIC, C/Serrano 121, 28006 Madrid, Spain
- Departamento
de Tecnologías de la Información, Escuela Politécnica
Superior, Universidad CEU-San Pablo, CEU
Universities, Campus Montepríncipe, Boadilla del Monte, Madrid 28668, Spain
| | | | - Beatriz Galiana
- Department
of Physics, Escuela Politécnica Superior, Universidad Carlos III, 28911 Leganés, Madrid, Spain
| | - Carmen Ballesteros
- Department
of Physics, Escuela Politécnica Superior, Universidad Carlos III, 28911 Leganés, Madrid, Spain
| | - Alberta Bonanni
- Institut
für Halbleiter-und-Festkörperphysik, Johannes Kepler University, Altenbergerstr. 69, A-4040 Linz, Austria
| | - Javier Martín-Sánchez
- Institut
für Halbleiter-und-Festkörperphysik, Johannes Kepler University, Altenbergerstr. 69, A-4040 Linz, Austria
- Departamento
de Física, Universidad de Oviedo, 33007 Oviedo, Spain
- Center of
Research on Nanomaterials and Nanotechnology, CINN (CSIC−Universidad de Oviedo), El Entrego 33940, Spain
| | - Rosalía Serna
- Laser
Processing Group, Instituto de Óptica,
IO-CSIC, C/Serrano 121, 28006 Madrid, Spain
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Yu C, Chen B, Zhang X, Li X, Zhang J, Xu S, Yu H, Sun J, Cao Y, Xia H. Influence of Er3+ concentration and Ln3+ on the Judd–Ofelt parameters in LnOCl (Ln = Y, La, Gd) phosphors. Phys Chem Chem Phys 2020; 22:7844-7852. [DOI: 10.1039/c9cp06755h] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We investigated the dependence of Judd–Ofelt parameters of Er3+ on the Er3+ doping concentration and Ln3+ in the host.
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Affiliation(s)
- Chunfeng Yu
- School of Science
- Dalian Maritime University
- Dalian
- P. R. China
| | - Baojiu Chen
- School of Science
- Dalian Maritime University
- Dalian
- P. R. China
| | - Xizhen Zhang
- School of Science
- Dalian Maritime University
- Dalian
- P. R. China
| | - Xiangping Li
- School of Science
- Dalian Maritime University
- Dalian
- P. R. China
| | - Jinsu Zhang
- School of Science
- Dalian Maritime University
- Dalian
- P. R. China
| | - Sai Xu
- School of Science
- Dalian Maritime University
- Dalian
- P. R. China
| | - Hongquan Yu
- School of Science
- Dalian Maritime University
- Dalian
- P. R. China
| | - Jiashi Sun
- School of Science
- Dalian Maritime University
- Dalian
- P. R. China
| | - Yongze Cao
- School of Science
- Dalian Maritime University
- Dalian
- P. R. China
| | - Haiping Xia
- Key Laboratory of Photo-electronic Materials
- Ningbo University
- Ningbo
- P. R. China
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