卤化物
荧光粉
阳离子聚合
材料科学
钙钛矿(结构)
辐照
量子产额
化学
光化学
光学
光电子学
无机化学
荧光
结晶学
物理
核物理学
高分子化学
作者
Zewen Zhuang,Chengzhong Peng,Shan Gao,Huimin Yang,Jinlin Yin,Honghan Fei
标识
DOI:10.1002/anie.201706660
摘要
Abstract We report a family of cationic lead halide layered materials, formulated as [Pb 2 X 2 ] 2+ [ − O 2 C(CH) 2 CO 2 − ] (X=F, Cl, Br), exhibiting pronounced broadband white‐light emission in bulk form. These well‐defined PbX‐based structures achieve an external quantum efficiency as high as 11.8 %, which is comparable to the highest reported value (ca.9 %) for broadband phosphors based on layered organolead halide perovskites. More importantly, our cationic materials are ultrastable lead halide materials, which overcome the air/moisture‐sensitivity problems of lead perovskites. In contrast to the perovskites and other bulk emitters, the white‐light emission intensity of our materials remains undiminished after continuous UV irradiation for 30 days under atmospheric conditions (ca.60 % relative humidity). Our mechanistic studies confirm that the broadband emission is ascribed to short‐range electron‐phonon coupling in the strongly deformable lattice and generated self‐trapped carriers.
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