z-logo
open-access-imgOpen Access
Regulating Exciton–Phonon Coupling to Achieve a Near‐Unity Photoluminescence Quantum Yield in One‐Dimensional Hybrid Metal Halides
Author(s) -
Luo Hui,
Guo Songhao,
Zhang Yubo,
Bu Kejun,
Lin Haoran,
Wang Yingqi,
Yin Yanfeng,
Zhang Dongzhou,
Jin Shengye,
Zhang Wenqing,
Yang Wenge,
Ma Biwu,
Lü Xujie
Publication year - 2021
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202100786
Subject(s) - photoluminescence , halide , quantum yield , exciton , metal halides , phonon , metal , coupling (piping) , chemistry , materials science , condensed matter physics , optoelectronics , physics , inorganic chemistry , optics , fluorescence , organic chemistry , metallurgy
Low‐dimensional hybrid metal halides are emerging as a highly promising class of single‐component white‐emitting materials for their unique broadband emission from self‐trapped excitons (STEs). Despite substantial progress in the development of these metal halides, many challenges remain to be addressed to obtain a better fundamental understanding of the structure–property relationship and realize the full potentials of this class of materials. Here, via pressure regulation, a near 100% photoluminescence quantum yield (PLQY) of broadband emission is achieved in a corrugated 1D hybrid metal halide C 5 N 2 H 16 Pb 2 Br 6 , which possesses a highly distorted structure with an initial PLQY of 10%. Compression reduces the overlap between STE states and ground state, leading to a suppressed phonon‐assisted non‐radiative decay. The PL evolution is systematically demonstrated to be controlled by the pressure‐regulated exciton–phonon coupling which can be quantified using Huang–Rhys factor S . Detailed studies of the S ‐PLQY relation for a series of 1D hybrid metal halides (C 5 N 2 H 16 Pb 2 Br 6 , C 4 N 2 H 14 PbBr 4 , C 6 N 2 H 16 PbBr 4 , and (C 6 N 2 H 16 ) 3 Pb 2 Br 10 ) reveal a quantitative structure–property relationship that regulating S factor toward 28 leads to the maximum emission.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.
Having issues? You can contact us here