TY - JOUR
T1 - Chloride Insertion-Immobilization Enables Bright, Narrowband, and Stable Blue-Emitting Perovskite Diodes
AU - Ma, Dongxin
AU - Todorović, Petar
AU - Meshkat, Shadi
AU - Saidaminov, Makhsud I.
AU - Wang, Ya Kun
AU - Chen, Bin
AU - Li, Peicheng
AU - Scheffel, Benjamin
AU - Quintero-Bermudez, Rafael
AU - Fan, James Z.
AU - Dong, Yitong
AU - Sun, Bin
AU - Xu, Chao
AU - Zhou, Chun
AU - Hou, Yi
AU - Li, Xiyan
AU - Kang, Yuetong
AU - Voznyy, Oleksandr
AU - Lu, Zheng Hong
AU - Ban, Dayan
AU - Sargent, Edward H.
N1 - Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/3/18
Y1 - 2020/3/18
N2 - Metal halide perovskites show promise for light-emitting diodes (LEDs) owing to their facile manufacture and excellent optoelectronic performance, including high color purity and spectral stability, especially in the green region. However, for blue perovskite LEDs, the emission spectrum line width is broadened to over 25 nm by the coexistence of multiple reduced-dimensional perovskite domains, and the spectral stability is poor, with an undesirable shift (over 7 nm) toward longer wavelengths under operating conditions, degradation that occurs due to phase separation when mixed halides are employed. Here we demonstrate chloride insertion-immobilization, a strategy that enables blue perovskite LEDs, the first to exhibit narrowband (line width of 18 nm) and spectrally stable (no wavelength shift) performance. We prepare bromide-based perovskites and then employ organic chlorides for dynamic treatment, inserting and in situ immobilizing chlorides to blue-shift and stabilize the emission. We achieve sky-blue LEDs with a record luminance over 5100 cd/m2 at 489 nm, and an operating half-life of 51 min at 1500 cd/m2. By device structure optimization, we further realize an improved EQE of 5.2%
AB - Metal halide perovskites show promise for light-emitting diodes (LEDs) owing to their facile manufacture and excellent optoelectronic performance, including high color purity and spectral stability, especially in the green region. However, for blue perovskite LEDs, the emission spectrum line width is broadened to over 25 nm by the coexistence of multiple reduced-dimensional perovskite domains, and the spectral stability is poor, with an undesirable shift (over 7 nm) toward longer wavelengths under operating conditions, degradation that occurs due to phase separation when mixed halides are employed. Here we demonstrate chloride insertion-immobilization, a strategy that enables blue perovskite LEDs, the first to exhibit narrowband (line width of 18 nm) and spectrally stable (no wavelength shift) performance. We prepare bromide-based perovskites and then employ organic chlorides for dynamic treatment, inserting and in situ immobilizing chlorides to blue-shift and stabilize the emission. We achieve sky-blue LEDs with a record luminance over 5100 cd/m2 at 489 nm, and an operating half-life of 51 min at 1500 cd/m2. By device structure optimization, we further realize an improved EQE of 5.2%
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U2 - 10.1021/jacs.9b12323
DO - 10.1021/jacs.9b12323
M3 - Article
C2 - 32150404
AN - SCOPUS:85081664352
SN - 0002-7863
VL - 142
SP - 5126
EP - 5134
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 11
ER -