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

Dongxin Ma, Petar Todorović, Shadi Meshkat, Makhsud I. Saidaminov, Ya Kun Wang, Bin Chen, Peicheng Li, Benjamin Scheffel, Rafael Quintero-Bermudez, James Z. Fan, Yitong Dong, Bin Sun, Chao Xu, Chun Zhou, Yi Hou, Xiyan Li, Yuetong Kang, Oleksandr Voznyy, Zheng Hong Lu, Dayan BanEdward H. Sargent*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

119 Scopus citations

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%

Original languageEnglish (US)
Pages (from-to)5126-5134
Number of pages9
JournalJournal of the American Chemical Society
Volume142
Issue number11
DOIs
StatePublished - Mar 18 2020

ASJC Scopus subject areas

  • General Chemistry
  • Biochemistry
  • Catalysis
  • Colloid and Surface Chemistry

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