Premium
Intrinsic Broadband White‐Light Emission from Ultrastable, Cationic Lead Halide Layered Materials
Author(s) -
Zhuang Zewen,
Peng Chengdong,
Zhang Guiyang,
Yang Huimin,
Yin Jinlin,
Fei Honghan
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201706660
Subject(s) - halide , phosphor , cationic polymerization , materials science , perovskite (structure) , irradiation , quantum yield , chemistry , photochemistry , optics , optoelectronics , inorganic chemistry , fluorescence , crystallography , physics , nuclear physics , polymer chemistry
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.