Tunable bandgap and luminescence characters in single-phase two-dimensional perovskite AVA2PbClxBr4-x alloys

Two-dimensional (2D) lead halide perovskites have garnered increasing interest due to their high photoluminescence quantum yields and tunable luminescence characters, making them excellent materials in light-emitting, especially for white-light emission. In contrast to their 3D analogues, they are f...

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Autores principales:	Huanfeng He, Guoliang Tong, Yamin Shi, Ruling Wang, Yige Liu, Jian Chen, Natarajan Thirugnanam, Junnian Chen, Yunbin He
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Two-dimensional Perovskite alloys Bandgap tuning Luminescence Self-trapped excitons Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/5bf05b07d2894fa8b5fbafa19fc31c06
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spelling	oai:doaj.org-article:5bf05b07d2894fa8b5fbafa19fc31c062021-11-20T05:06:36ZTunable bandgap and luminescence characters in single-phase two-dimensional perovskite AVA2PbClxBr4-x alloys2238-785410.1016/j.jmrt.2021.10.139https://doaj.org/article/5bf05b07d2894fa8b5fbafa19fc31c062021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S223878542101276Xhttps://doaj.org/toc/2238-7854Two-dimensional (2D) lead halide perovskites have garnered increasing interest due to their high photoluminescence quantum yields and tunable luminescence characters, making them excellent materials in light-emitting, especially for white-light emission. In contrast to their 3D analogues, they are formed by inserting large organic cations between the anionic layers of lead halide octahedra. Herein, we designed and prepared AVA2PbClxBr4-x (x = 0, 1, 2, 3, 4) alloy perovskites, in which AVA (5-aminovaleric acid) was used as an organic cation to separate the layers of chlorine-substituted lead bromide 2D perovskite, in order to identify the role of Cl substitution in tuning the bandgap and luminescence characters of the 2D AVA2PbBr4 perovskite. X-ray diffraction measurements revealed achievement of single-phase thin films of AVA2PbClxBr4-x perovskites with a (001) orientation. With increasing Cl/Br ratio from 0 to 1, the lattice constant c was found to decrease from 1.672 nm to 1.597 nm following c(x) = 1.674 – 0.076x, while the bandgap increased from 3.11 eV to 3.76 eV as approximated with Eg(x) = 3.08 + 0.62x. Correspondingly, the alloy luminescence character evolved from narrow-band blue-violet to broadband white-light emission, which was attributed to transformation from free-exciton to self-trapped-exciton emission with increasing octahedral distortion caused by Cl substitution. Based on an alloy system with continuously varying content designed for the first time, the work highlighted the role of Cl incorporation in changing the crystal lattice structure, and tuning bandgap as well as the light emission characters in 2D lead halide perovskites.Huanfeng HeGuoliang TongYamin ShiRuling WangYige LiuJian ChenNatarajan ThirugnanamJunnian ChenYunbin HeElsevierarticleTwo-dimensionalPerovskite alloysBandgap tuningLuminescenceSelf-trapped excitonsMining engineering. MetallurgyTN1-997ENJournal of Materials Research and Technology, Vol 15, Iss , Pp 5353-5359 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Two-dimensional Perovskite alloys Bandgap tuning Luminescence Self-trapped excitons Mining engineering. Metallurgy TN1-997
spellingShingle	Two-dimensional Perovskite alloys Bandgap tuning Luminescence Self-trapped excitons Mining engineering. Metallurgy TN1-997 Huanfeng He Guoliang Tong Yamin Shi Ruling Wang Yige Liu Jian Chen Natarajan Thirugnanam Junnian Chen Yunbin He Tunable bandgap and luminescence characters in single-phase two-dimensional perovskite AVA2PbClxBr4-x alloys
description	Two-dimensional (2D) lead halide perovskites have garnered increasing interest due to their high photoluminescence quantum yields and tunable luminescence characters, making them excellent materials in light-emitting, especially for white-light emission. In contrast to their 3D analogues, they are formed by inserting large organic cations between the anionic layers of lead halide octahedra. Herein, we designed and prepared AVA2PbClxBr4-x (x = 0, 1, 2, 3, 4) alloy perovskites, in which AVA (5-aminovaleric acid) was used as an organic cation to separate the layers of chlorine-substituted lead bromide 2D perovskite, in order to identify the role of Cl substitution in tuning the bandgap and luminescence characters of the 2D AVA2PbBr4 perovskite. X-ray diffraction measurements revealed achievement of single-phase thin films of AVA2PbClxBr4-x perovskites with a (001) orientation. With increasing Cl/Br ratio from 0 to 1, the lattice constant c was found to decrease from 1.672 nm to 1.597 nm following c(x) = 1.674 – 0.076x, while the bandgap increased from 3.11 eV to 3.76 eV as approximated with Eg(x) = 3.08 + 0.62x. Correspondingly, the alloy luminescence character evolved from narrow-band blue-violet to broadband white-light emission, which was attributed to transformation from free-exciton to self-trapped-exciton emission with increasing octahedral distortion caused by Cl substitution. Based on an alloy system with continuously varying content designed for the first time, the work highlighted the role of Cl incorporation in changing the crystal lattice structure, and tuning bandgap as well as the light emission characters in 2D lead halide perovskites.
format	article
author	Huanfeng He Guoliang Tong Yamin Shi Ruling Wang Yige Liu Jian Chen Natarajan Thirugnanam Junnian Chen Yunbin He
author_facet	Huanfeng He Guoliang Tong Yamin Shi Ruling Wang Yige Liu Jian Chen Natarajan Thirugnanam Junnian Chen Yunbin He
author_sort	Huanfeng He
title	Tunable bandgap and luminescence characters in single-phase two-dimensional perovskite AVA2PbClxBr4-x alloys
title_short	Tunable bandgap and luminescence characters in single-phase two-dimensional perovskite AVA2PbClxBr4-x alloys
title_full	Tunable bandgap and luminescence characters in single-phase two-dimensional perovskite AVA2PbClxBr4-x alloys
title_fullStr	Tunable bandgap and luminescence characters in single-phase two-dimensional perovskite AVA2PbClxBr4-x alloys
title_full_unstemmed	Tunable bandgap and luminescence characters in single-phase two-dimensional perovskite AVA2PbClxBr4-x alloys
title_sort	tunable bandgap and luminescence characters in single-phase two-dimensional perovskite ava2pbclxbr4-x alloys
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/5bf05b07d2894fa8b5fbafa19fc31c06
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Tunable bandgap and luminescence characters in single-phase two-dimensional perovskite AVA2PbClxBr4-x alloys

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