TY - JOUR

T1 - Achieving Highly Efficient Warm-White Light Emission in All-Inorganic Copper-Silver Halides via Structural Regulation

AU - Wang, Sijia

AU - Liu, Runze

AU - Li, Juntao

AU - Sun, Fengke

AU - Yang, Qing

AU - Li, Shunshun

AU - Liu, Jianyong

AU - Chen, Junsheng

AU - Cheng, Pengfei

N1 - Funding Information: This work was financially supported by the National Natural Science Foundation of China (22109162), the Innovation Foundation of Dalian Institute of Chemical Physics (DICP I202127), the Natural Science Foundation of Liaoning Province (2023‐MS‐001), and China Postdoctoral Science Foundation (2021M703144, 2022T150637). J. C. acknowledges support from the Novo Nordisk Foundation (NNF22OC0073582). Publisher Copyright: © 2023 The Authors. Advanced Science published by Wiley-VCH GmbH.

PY - 2023

Y1 - 2023

N2 - Single-component metal halides with white light emission are highly attractive for solid-state lighting applications, but it is still challenging to develop all-inorganic lead-free metal halides with high white-light emission efficiency. Herein, by rationally introducing silver (Ag) into zero-dimensional (0D) Cs3Cu2Br5 as new structural building unit, a one-dimensional (1D) bimetallic halide Cs6Cu3AgBr10 is designed that emits strong warm-white light with an impressive photoluminescence quantum yield (PLQY) of 94.5% and excellent stability. This structural transformation lowers the conduction band minimum while maintaining the localized nature of the valence band maximum, which is crucial in expanding the excitation spectrum and obtaining efficient self-trapped excitons (STEs) emission simultaneously. Detailed spectroscopy studies reveal that the white-light originates from triplet STEs emission, which can be remarkably improved by weakening the strong electron-phonon coupling and thus suppressing phonon-induced non-radiative processes. Moreover, the interesting temperature-dependent emission behavior, together with self-absorption-free property, make Cs6Cu3AgBr10 as sensitive luminescent thermometer and high-performance X-ray scintillator, respectively. These findings demonstrate a general approach to achieving effective single-component white-light emitters based on lead-free, all-inorganic metal halides, thereby opening up a new avenue to explore their versatile applications such as lighting, temperature detection and X-ray imaging.

AB - Single-component metal halides with white light emission are highly attractive for solid-state lighting applications, but it is still challenging to develop all-inorganic lead-free metal halides with high white-light emission efficiency. Herein, by rationally introducing silver (Ag) into zero-dimensional (0D) Cs3Cu2Br5 as new structural building unit, a one-dimensional (1D) bimetallic halide Cs6Cu3AgBr10 is designed that emits strong warm-white light with an impressive photoluminescence quantum yield (PLQY) of 94.5% and excellent stability. This structural transformation lowers the conduction band minimum while maintaining the localized nature of the valence band maximum, which is crucial in expanding the excitation spectrum and obtaining efficient self-trapped excitons (STEs) emission simultaneously. Detailed spectroscopy studies reveal that the white-light originates from triplet STEs emission, which can be remarkably improved by weakening the strong electron-phonon coupling and thus suppressing phonon-induced non-radiative processes. Moreover, the interesting temperature-dependent emission behavior, together with self-absorption-free property, make Cs6Cu3AgBr10 as sensitive luminescent thermometer and high-performance X-ray scintillator, respectively. These findings demonstrate a general approach to achieving effective single-component white-light emitters based on lead-free, all-inorganic metal halides, thereby opening up a new avenue to explore their versatile applications such as lighting, temperature detection and X-ray imaging.

KW - copper halides

KW - scintillators

KW - self-trapped excitons

KW - structural regulation

KW - warm-white light

U2 - 10.1002/advs.202303501

DO - 10.1002/advs.202303501

M3 - Journal article

C2 - 37537363

AN - SCOPUS:85166582565

VL - 10

JO - Advanced Science

JF - Advanced Science

SN - 2198-3844

IS - 28

M1 - 2303501

ER -