Single-Exciton Amplified Spontaneous Emission in Thin Films of CsPbX3 (X = Br, I) Perovskite Nanocrystals
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Otros documentos de la autoría: Navarro-Arenas, Juan; Suárez, Isaac; Chirvony, Vladimir; Gualdrón Reyes, Andrés Fabián; Mora-Sero, Ivan; Martínez-Pastor, Juan P.
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Título
Single-Exciton Amplified Spontaneous Emission in Thin Films of CsPbX3 (X = Br, I) Perovskite NanocrystalsAutoría
Fecha de publicación
2019-09-23Editor
American Chemical SocietyCita bibliográfica
NAVARRO-ARENAS, Juan, et al. Single-Exciton Amplified Spontaneous Emission in Thin Films of CsPbX3 (X= Br, I) Perovskite Nanocrystals. The journal of physical chemistry letters, 2019, 10.20: 6389-6398.Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://pubs.acs.org/doi/abs/10.1021/acs.jpclett.9b02369Versión
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Resumen
CsPbX3 perovskite nanocrystals (PNCs) have emerged as an excellent material for stimulated emission purposes, with even more prospective applications than conventional colloidal quantum dots. However, a better under ... [+]
CsPbX3 perovskite nanocrystals (PNCs) have emerged as an excellent material for stimulated emission purposes, with even more prospective applications than conventional colloidal quantum dots. However, a better understanding of the physical mechanisms responsible for amplified spontaneous emission (ASE) is required to achieve more ambitious targets (lasing under continuous wave optical or electrical excitation). Here, we establish the intrinsic mechanisms underlying ASE in PNCs of three different band gaps (CsPbBr3, CsPbBr1.5I1.5, and CsPbI3). Our characterization at cryogenic temperatures does not reveal any evidence of the biexciton mechanism in the formation of ASE. Instead, the measured shift toward long wavelengths of the ASE band is easily explained by the reabsorption in the PNC layer, which becomes stronger for thicker layers. In this way, the threshold of ASE is determined only by optical losses at a given geometry, which is the single-exciton mechanism responsible for ASE. Experimental results are properly reproduced by a physical model. [-]
Proyecto de investigación
Spanish MINECO (project No.TEC2017-86102-C2-1-R) ; Generalitat Valenciana, project Q-Devices (Prometeo/2018/098) ; European Research Council (ERC) via Consolidator Grant (724424 -No-LIMIT) ; Spanish MINECO (J.N.-A. Ph.D. Grant No. BES-2015-074014).Derechos de acceso
Copyright © 2019 American Chemical Society
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