1
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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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Romero-Pérez C, Delgado NF, Herrera-Collado M, Calvo ME, Míguez H. Ultrapure Green High Photoluminescence Quantum Yield from FAPbBr 3 Nanocrystals Embedded in Transparent Porous Films. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2023; 35:5541-5549. [PMID: 37528839 PMCID: PMC10389805 DOI: 10.1021/acs.chemmater.3c00934] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 06/19/2023] [Indexed: 08/03/2023]
Abstract
Achieving highly transparent and emissive films based on perovskite quantum dots (PQDs) is a challenging task since their photoluminescence quantum yield (PLQY) typically drops abruptly when they are used as building blocks to make a solid. In this work, we obtain highly transparent films containing FAPbBr3 quantum dots that display a narrow green emission (λ = 530 nm, full width at half-maximum (FWHM) = 23 nm) with a PLQY as high as 86%. The method employed makes use of porous matrices that act as arrays of nanoreactors to synthesize the targeted quantum dots within their void space, providing both a means to keep them dispersed and a protective environment. Further infiltration with poly(methyl methacrylate) (PMMA) increases the mechanical and chemical stability of the ensemble and serves to passivate surface defects, boosting the emission of the embedded PQD and significantly reducing the width of the emission peak, which fulfills the requirements established by the Commission Internationale de l'Éclairage (CIE) to be considered an ultrapure green emitter. The versatility of this approach is demonstrated by fabricating a color-converting layer that can be easily transferred onto a light-emitting device surface to modify the spectral properties of the outgoing radiation.
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Affiliation(s)
- Carlos Romero-Pérez
- Instituto
de Ciencias de Materiales de Sevilla (Consejo Superior de Investigaciones
Científicas-Universidad de Sevilla), C/Américo Vespucio, 49, Sevilla 41092, Spain
| | - Natalia Fernández Delgado
- Department
of Material Science, Metallurgical Engineering and Inorganic Chemistry
IMEYMAT, Facultad de Ciencias (Universidad
de Cádiz), Campus Río San Pedro, s/n, Puerto Real, Cádiz 11510, Spain
| | - Miriam Herrera-Collado
- Department
of Material Science, Metallurgical Engineering and Inorganic Chemistry
IMEYMAT, Facultad de Ciencias (Universidad
de Cádiz), Campus Río San Pedro, s/n, Puerto Real, Cádiz 11510, Spain
| | - Mauricio E. Calvo
- Instituto
de Ciencias de Materiales de Sevilla (Consejo Superior de Investigaciones
Científicas-Universidad de Sevilla), C/Américo Vespucio, 49, Sevilla 41092, Spain
| | - Hernán Míguez
- Instituto
de Ciencias de Materiales de Sevilla (Consejo Superior de Investigaciones
Científicas-Universidad de Sevilla), C/Américo Vespucio, 49, Sevilla 41092, Spain
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3
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Li Y, Gao X, Fang Y, Cui B, Shen Y. Nanomaterials-driven innovative electrochemiluminescence aptasensors in reporting food pollutants. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2023.215136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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4
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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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5
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Tennyson E, Frohna K, Drake WK, Sahli F, Chien-Jen Yang T, Fu F, Werner J, Chosy C, Bowman AR, Doherty TAS, Jeangros Q, Ballif C, Stranks SD. Multimodal Microscale Imaging of Textured Perovskite-Silicon Tandem Solar Cells. ACS ENERGY LETTERS 2021; 6:2293-2304. [PMID: 34307879 PMCID: PMC8291767 DOI: 10.1021/acsenergylett.1c00568] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 05/14/2021] [Indexed: 05/02/2023]
Abstract
Halide perovskite/crystalline silicon (c-Si) tandem solar cells promise power conversion efficiencies beyond the limits of single-junction cells. However, the local light-matter interactions of the perovskite material embedded in this pyramidal multijunction configuration, and the effect on device performance, are not well understood. Here, we characterize the microscale optoelectronic properties of the perovskite semiconductor deposited on different c-Si texturing schemes. We find a strong spatial and spectral dependence of the photoluminescence (PL) on the geometrical surface constructs, which dominates the underlying grain-to-grain PL variation found in halide perovskite films. The PL response is dependent upon the texturing design, with larger pyramids inducing distinct PL spectra for valleys and pyramids, an effect which is mitigated with small pyramids. Further, optimized quasi-Fermi level splittings and PL quantum efficiencies occur when the c-Si large pyramids have had a secondary smoothing etch. Our results suggest that a holistic optimization of the texturing is required to maximize light in- and out-coupling of both absorber layers and there is a fine balance between the optimal geometrical configuration and optoelectronic performance that will guide future device designs.
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Affiliation(s)
- Elizabeth
M. Tennyson
- Cavendish
Laboratory, University of Cambridge, 19 JJ Thomson Avenue, Cambridge CB3 0HE, U.K.
| | - Kyle Frohna
- Cavendish
Laboratory, University of Cambridge, 19 JJ Thomson Avenue, Cambridge CB3 0HE, U.K.
| | - William K. Drake
- Cavendish
Laboratory, University of Cambridge, 19 JJ Thomson Avenue, Cambridge CB3 0HE, U.K.
| | - Florent Sahli
- École
Polytechnique Fédérale de Lausanne, Photovoltaics and Thin-Film Electronics Laboratory, Neuchatel 2002, CH, Switzerland
| | - Terry Chien-Jen Yang
- École
Polytechnique Fédérale de Lausanne, Photovoltaics and Thin-Film Electronics Laboratory, Neuchatel 2002, CH, Switzerland
| | - Fan Fu
- École
Polytechnique Fédérale de Lausanne, Photovoltaics and Thin-Film Electronics Laboratory, Neuchatel 2002, CH, Switzerland
| | - Jérémie Werner
- École
Polytechnique Fédérale de Lausanne, Photovoltaics and Thin-Film Electronics Laboratory, Neuchatel 2002, CH, Switzerland
| | - Cullen Chosy
- Department
of Chemical Engineering, Stanford University, Stanford, California 94305, United States
| | - Alan R. Bowman
- Cavendish
Laboratory, University of Cambridge, 19 JJ Thomson Avenue, Cambridge CB3 0HE, U.K.
| | - Tiarnan A. S. Doherty
- Cavendish
Laboratory, University of Cambridge, 19 JJ Thomson Avenue, Cambridge CB3 0HE, U.K.
| | - Quentin Jeangros
- École
Polytechnique Fédérale de Lausanne, Photovoltaics and Thin-Film Electronics Laboratory, Neuchatel 2002, CH, Switzerland
| | - Christophe Ballif
- École
Polytechnique Fédérale de Lausanne, Photovoltaics and Thin-Film Electronics Laboratory, Neuchatel 2002, CH, Switzerland
| | - Samuel D. Stranks
- Cavendish
Laboratory, University of Cambridge, 19 JJ Thomson Avenue, Cambridge CB3 0HE, U.K.
- Department
of Chemical Engineering & Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, U.K.
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6
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Jiménez-Solano A, Martínez-Sarti L, Pertegás A, Lozano G, Bolink HJ, Míguez H. Dipole reorientation and local density of optical states influence the emission of light-emitting electrochemical cells. Phys Chem Chem Phys 2019; 22:92-96. [PMID: 31802085 DOI: 10.1039/c9cp05505c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we analyze the temporal evolution of the electroluminescence of light-emitting electrochemical cells (LECs), a thin-film light-emitting device, in order to maximize the luminous power radiated by these devices. A careful analysis of the spectral and angular distribution of the emission of LECs fabricated under the same experimental conditions allows describing the dynamics of the spatial region from which LECs emit, i.e. the generation zone, as bias is applied. This effect is mediated by dipole reorientation within such an emissive region and its optical environment, since its spatial drift yields a different interplay between the intrinsic emission of the emitters and the local density of optical states of the system. Our results demonstrate that engineering the optical environment in thin-film light-emitting devices is key to maximize their brightness.
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Affiliation(s)
- Alberto Jiménez-Solano
- Instituto de Ciencia de Materiales de Sevilla, Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, Calle Américo Vespucio 49, 41092, Sevilla, Spain.
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7
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Mehetor SK, Ghosh H, Pradhan N. Acid-Amine Equilibria for Formation and Long-Range Self-Organization of Ultrathin CsPbBr 3 Perovskite Platelets. J Phys Chem Lett 2019; 10:1300-1305. [PMID: 30830785 DOI: 10.1021/acs.jpclett.9b00333] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Impact of acid-amine equilibrium for triggering the formation of CsPbBr3 platelets and subsequent long-range self-assembly as a function of acid concentration is reported. The study was performed by treating Cs precursor followed by oleic acid to the ongoing process of L2PbBr4 layered perovskites formation at room temperature, and this led to the thinnest possible platelets of CsPbBr3 with one atomic layer of Cs insertion. These platelets form self-assembly in the micrometer range, and this ordering was tuned as a function of oleic acid concentration and reaction time. With evidence obtained from in situ live monitoring by optical microscopy of these assemblies during the ongoing reaction in solution and analyzing the collected samples ex situ by electron microscopy, it was established that these long-range 1D organizations of platelets took place in solution. Details of the insights of the formation, self-assembly, and impact of different reaction parameters in the formation of these platelets are investigated and reported in this Letter.
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Affiliation(s)
- Shyamal Kumar Mehetor
- School of Materials Science , Indian Association for the Cultivation of Science , Kolkata 700032 , India
| | - Harekrishna Ghosh
- School of Materials Science , Indian Association for the Cultivation of Science , Kolkata 700032 , India
| | - Narayan Pradhan
- School of Materials Science , Indian Association for the Cultivation of Science , Kolkata 700032 , India
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8
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Rubino A, Anaya M, Galisteo-López JF, Rojas TC, Calvo ME, Míguez H. Highly Efficient and Environmentally Stable Flexible Color Converters Based on Confined CH 3NH 3PbBr 3 Nanocrystals. ACS APPLIED MATERIALS & INTERFACES 2018; 10:38334-38340. [PMID: 30360096 DOI: 10.1021/acsami.8b11706] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this work, we demonstrate a synthetic route to attain methylammonium lead bromide (CH3NH3PbBr3) perovskite nanocrystals (nc-MAPbBr3, 1.5 nm < size < 3 nm) and provide them with functionality as highly efficient flexible, transparent, environmentally stable, and adaptable color-converting films. We use nanoparticle metal oxide (MOx) thin films as porous scaffolds of controlled nanopores size distribution to synthesize nc-MAPbBr3 through the infiltration of perovskite liquid precursors. We find that the control over the reaction volume imposed by the nanoporous scaffold gives rise to a strict control of the nanocrystal size, which allows us to observe well-defined quantum confinement effects on the photo-emission, being the luminescence maximum tunable with precision between λ = 530 nm (green) and λ = 490 nm (blue). This hybrid nc-MAPbBr3/MOx structure presents high mechanical stability and permits subsequent infiltration with an elastomer to achieve a self-standing flexible film, which not only maintains the photo-emission efficiency of the nc-MAPbBr3 unaltered but also prevents their environmental degradation. Applications as adaptable color-converting layers for light-emitting devices are envisaged and demonstrated.
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Affiliation(s)
- Andrea Rubino
- Institute of Materials Science of Seville , Spanish National Research Council-University of Seville , C/Américo Vespucio 49 , 41092 Seville , Spain
| | - Miguel Anaya
- Institute of Materials Science of Seville , Spanish National Research Council-University of Seville , C/Américo Vespucio 49 , 41092 Seville , Spain
| | - Juan F Galisteo-López
- Institute of Materials Science of Seville , Spanish National Research Council-University of Seville , C/Américo Vespucio 49 , 41092 Seville , Spain
| | - T Cristina Rojas
- Institute of Materials Science of Seville , Spanish National Research Council-University of Seville , C/Américo Vespucio 49 , 41092 Seville , Spain
| | - Mauricio E Calvo
- 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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9
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Jiménez-Solano A, Carretero-Palacios S, Míguez H. Absorption enhancement in methylammonium lead iodide perovskite solar cells with embedded arrays of dielectric particles. OPTICS EXPRESS 2018; 26:A865-A878. [PMID: 30184939 DOI: 10.1364/oe.26.00a865] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Accepted: 07/10/2018] [Indexed: 06/08/2023]
Abstract
In the field of hybrid organic-inorganic perovskite based photovoltaics, there is a growing interest in the exploration of novel and smarter ways to improve the cells light harvesting efficiency at targeted wavelength ranges within the minimum volume possible, as well as in the development of colored and/or semitransparent devices that could pave the way both to their architectonic integration and to their use in the flowering field of tandem solar cells. The work herein presented targets these different goals by means of the theoretical optimization of the optical design of standard opaque and semitransparent perovskite solar cells. In order to do so, we focus on the effect of harmless, compatible and commercially available dielectric inclusions within the absorbing material, methylammonium lead iodide (MAPI). Following a gradual and systematic process of analysis, we are capable of identifying the appearance of collective and hybrid (both localized and extended) photonic resonances which allow to significantly improve light harvesting and thus the overall efficiency of the standard device by above 10% with respect to the reference value while keeping the semiconductor film thickness to a minimum. We believe our results will be particularly relevant in the promising field of perovskite solar cell based tandem photovoltaic devices, which has posed new challenges to the solar energy community in order to maximize the performance of semitransparent cells, but also for applications focusing on architectonic integration.
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Abstract
The development of smart illumination sources represents a central challenge for current technology. In this context, the quest for novel materials that enable efficient light generation is essential. Metal halide compounds with perovskite crystalline structure (ABX3) have gained tremendous interest in the last five years since they come as easy-to-prepare high performance semiconductors. Perovskite absorbers are driving the power-conversion-efficiencies of thin film photovoltaics to unprecedented values. Nowadays, mixed-cation, mixed-halide lead perovskite solar cells reach efficiencies consistently over 20% and promise to get close to 30% in multijunction devices when combined with silicon cells at no surcharge. Nonetheless, perovskites' fame extends further since extensive research on these novel semiconductors has also revealed their brightest side. Soon after their irruption in the photovoltaic scenario, demonstration of efficient color tunable-with high color purity-perovskite emitters has opened new avenues for light generation applications that are timely to discuss herein.
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