Chloride Insertion-Immobilization Enables Bright, Narrowband, and Stable Blue-Emitting Perovskite Diodes

Journal of the American Chemical Society
Dongxin MaEdward H Sargent

Abstract

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% at 479 nm and an operating half-life of 90 ...Continue Reading

References

Apr 16, 2009·Journal of the American Chemical Society·Akihiro KojimaTsutomu Miyasaka
Jun 12, 2013·Physical Review Letters·Yasuhiro ShirasakiVladimir Bulović
Mar 19, 2014·Nature Materials·Guichuan XingTze Chien Sum
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Oct 27, 2016·Physical Chemistry Chemical Physics : PCCP·Jie XingJinsong Huang
Aug 31, 2018·Advanced Materials·Li Na QuanEdward H Sargent
Sep 1, 2018·Nature Communications·Jun XingEdward H Sargent
Jan 17, 2019·Journal of the American Chemical Society·Jeremy HieulleYabing Qi
Apr 25, 2019·Nature Communications·Yuanzhi JiangJun Chen
Apr 26, 2019·Chemical Reviews·Li Na QuanEdward H Sargent

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Citations

Feb 25, 2021·Research : a Science Partner Journal·Evan T VickersJin Z Zhang
Mar 11, 2021·The Journal of Physical Chemistry Letters·Jeffrey T DuBosePrashant V Kamat
Mar 21, 2021·Light, Science & Applications·Li ZhangMingjian Yuan
Jul 29, 2021·Inorganic Chemistry·Jiyu TianFinlay D Morrison
Dec 19, 2020·Journal of the American Chemical Society·Gergely F Samu, Csaba Janáky

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