Authors
Yanfeng Chen, Bing Yang, Erdong Zhang, Nian-Ke Chen, Yifan Shen, Meng Nan, Chunyang Tian, Bo Cai, Pengfei Xia, Gang Cheng, Juanli Zhao, Mingbin Zhou, Shufen Chen, Wei Shen, Zhihua Xiong
Published in
Nano letters. Volume 26. Issue 35. Pages 11912-11920. Sep 09, 2026.
Abstract
Perovskite quantum dot light-emitting diodes (PQD LEDs) are promising candidates for high-color-gamut displays, yet deep-blue devices meeting the Rec. 2020 standard with high efficiency and stability remain a tremendous challenge. Here we present a Lewis acid-driven surface reconstruction strategy to enable high-performance deep-blue CsPbBr3 PQD LEDs. Strong ionic interactions between Sr2+ and octanoic acid promote octylamine protonation, triggering simultaneous PQD size reduction, defect suppression, and photoluminescence quantum yield (PLQY) enhancement. The reconstructed PQDs exhibit deep-blue emission at 461 nm with a narrow 18 nm full width at half-maximum and a PLQY of 80%. The resulting LEDs deliver 98.1% color purity, color coordinates of (0.146, 0.059), and full compliance with Rec. 2020 blue specifications. A peak external quantum efficiency of 8.5% and an operational half-lifetime of 41 min are achieved, among the highest reported for pure-bromide deep-blue PQD LEDs. This work provides a facile surface-engineering strategy for efficient deep-blue optoelectronics.
PMID:
42715066
Bibliographic data and abstract were imported from PubMed on 10 Sep 2026.
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