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Pseudohalogen Resurfaced CsPbBr 3 Nanocrystals for Bright, Efficient, and Stable Green-Light-Emitting Diodes.
- Source :
-
Nano letters [Nano Lett] 2023 Apr 26; Vol. 23 (8), pp. 3385-3393. Date of Electronic Publication: 2023 Apr 13. - Publication Year :
- 2023
-
Abstract
- Lead halide perovskite nanocrystals (LHP NCs) are regarded as promising emitters for next-generation ultrahigh-definition displays due to their high color purity and wide color gamut. Recently, the external quantum efficiency (EQE) of LHP NC based light-emitting diodes (PNC LEDs) has been rapidly improved to a level required by practical applications. However, the poor operational stability of the device, caused by halide ion migration at the grain boundary of LHP NC thin films, remains a great challenge. Herein, we report a resurfacing strategy via pseudohalogen ions to mitigate detrimental halide ion migration, aiming to stabilize PNC LEDs. We employ a thiocyanate solution processed post-treatment method to efficiently resurface CsPbBr <subscript>3</subscript> NCs and demonstrate that the thiocyanate ions can effectively inhibit bromide ion migration in LHP NC thin films. Owing to thiocyanate resurfacing, we fabricated LEDs with a high EQE of 17.3%, a maximum brightness of 48000 cd m <superscript>-2</superscript> , and an excellent operation half-life time.
Details
- Language :
- English
- ISSN :
- 1530-6992
- Volume :
- 23
- Issue :
- 8
- Database :
- MEDLINE
- Journal :
- Nano letters
- Publication Type :
- Academic Journal
- Accession number :
- 37052258
- Full Text :
- https://doi.org/10.1021/acs.nanolett.3c00385