Authors
Changjian Dai, Kun Zhang, Hengyang Xiang, Xinrui Chen, Yuqin Su, Qunqing Lin, Yuxiang Hua, Haibo Zeng
Published in
Inorganic chemistry. Volume 65. Issue 35. Pages 20676-20684. Sep 07, 2026.
Abstract
Perovskite quantum dots (PQDs) hold great promise for next-generation displays owing to their excellent optoelectronic properties and low-cost solution processability. Ligand-assisted reprecipitation (LARP) is a widely adopted room-temperature synthesis method, yet inhomogeneous prenucleation clusters in precursors yield PQDs with broad size distribution and high surface defect density. Herein, we introduce a zwitterionic ligand with multiple coordination sites and strong adsorption energy. It homogenizes prenucleation clusters by regulating the coordination state of lead bromide complexes in precursors, suppressing dynamic ligand dissociation and enabling a homogeneous crystallization pathway. The resulting PQDs show a narrowed emission full width at half-maximum from 25.1 to 21.2 nm and a prolonged photoluminescence lifetime from 22.28 to 57.88 ns. The corresponding perovskite light-emitting diodes achieve a maximum external quantum efficiency of 20.8% (from 5.6%), a peak luminance of 64 005 cd m-2 (from 16 370 cd m-2), and a T50 operational lifetime at 1000 cd m-2 extended from 30 to 309 s. This provides a strategy for the controllable room-temperature synthesis of high-quality PQDs toward the construction of high-performance PeLEDs.
PMID:
42704187
Bibliographic data and abstract were imported from PubMed on 07 Sep 2026.
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