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Highly Luminescent Cesium Lead Halide Perovskite Nanocrystals Stabilized in Glasses for Light‐Emitting Applications
Author(s) -
Ye Ying,
Zhang Wenchao,
Zhao Zhiyong,
Wang Jing,
Liu Chao,
Deng Zhao,
Zhao Xiujian,
Han Jianjun
Publication year - 2019
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201801663
Subject(s) - materials science , nanocrystal , photoluminescence , quantum yield , quantum efficiency , amorphous solid , perovskite (structure) , optoelectronics , nanotechnology , chemical engineering , optics , crystallography , chemistry , engineering , physics , fluorescence
Cesium lead halide (CsPbX 3 ) nanocrystals have great potential for photovoltaic and optoelectronic applications, but they are sensitive to oxygen, moisture, and light irradiation. Embedding these CsPbX 3 nanocrystals into all‐inorganic amorphous solid matrices such as glass is expected to improve their stability. In this work, CsPbX 3 nanocrystals are precipitated in boro‐germanate glasses with tunable composition, absorption, and photoluminescence. Quantum efficiency of CsPbBr 3 nanocrystals in glass can be as high as ≈80% and ≈20% for CsPb(Cl/Br) 3 and CsPb(Br/I) 3 nanocrystals, respectively. Thermo‐ and photostabilities of CsPbX 3 nanocrystals in glass are greatly improved due to the inert nature of glasses, and intense laser irradiation‐induced damage to CsPbX 3 nanocrystals is recoverable through thermal annealing. With CsPbBr 3 nanocrystal‐embedded glass slices, a green light‐emitting device with a luminous efficiency of ≈120 lm W −1 and an external quantum yield of ≈30% is achieved. A white‐light‐emitting device consisting of CsPbBr 3 nanocrystals and CsPb(Br/I) 3 nanocrystal–embedded glass slices shows luminous efficiency in the range of 50–60 lm W −1 and external quantum yield of 20–25%. The thermo‐ and photostabilities along with the chemical stability of CsPbX 3 nanocrystal–embedded glasses are promising materials for photoluminescence related applications.