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Lead‐Free Halide Rb 2 CuBr 3 as Sensitive X‐Ray Scintillator
Author(s) -
Yang Bo,
Yin Lixiao,
Niu Guangda,
Yuan JunHui,
Xue KanHao,
Tan Zhifang,
Miao XiangShui,
Niu Ming,
Du Xinyuan,
Song Haisheng,
Lifshitz Efrat,
Tang Jiang
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201904711
Subject(s) - radioluminescence , scintillator , photoluminescence , materials science , quantum yield , halide , perovskite (structure) , absorption (acoustics) , optoelectronics , yield (engineering) , optics , fluorescence , physics , chemistry , inorganic chemistry , crystallography , detector , metallurgy , composite material
Abstract Scintillators are widely utilized for radiation detections in many fields, such as nondestructive inspection, medical imaging, and space exploration. Lead halide perovskite scintillators have recently received extensive research attention owing to their tunable emission wavelength, low detection limit, and ease of fabrication. However, the low light yields toward X‐ray irradiation and the lead toxicity of these perovskites severely restricts their practical application. A novel lead‐free halide is presented, namely Rb 2 CuBr 3 , as a scintillator with exceptionally high light yield. Rb 2 CuBr 3 exhibits a 1D crystal structure and enjoys strong carrier confinement and near‐unity photoluminescence quantum yield (98.6%) in violet emission. The high photoluminescence quantum yield combined with negligible self‐absorption from self‐trapped exciton emission and strong X‐ray absorption capability enables a record high light yield of ≈91056 photons per MeV among perovskite and relative scintillators. Overall, Rb 2 CuBr 3 provides nontoxicity, high radioluminescence intensity, and good stability, thus laying good foundations for potential application in low‐dose radiography.