Stable Perovskite Quantum Dots Light‐Emitting Diodes with Efficiency Exceeding 24

Perovskite nanocrystals for light‐emitting diodes are often synthesized by uncontrollable metathesis reactions, suffering from low product yield, nonuniform growth, and poor stability. Herein, by controlling the nucleation kinetics with high dissociation constant (Ka or Kb) acids or bases, homogenou...

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Published in:Advanced science 2023-12, Vol.10 (36), p.e2304696-n/a
Main Authors: Zhang, Xuanyu, Wang, Qiangqiang, Yao, Zhiwei, Deng, Ming, Wang, Jing, Qian, Lei, Ren, Yong, Yan, Yuying, Xiang, Chaoyu
Format: Article
Language:English
Subjects:
Acids
Efficiency
Equilibrium
Humidity
LEDs
Ligands
Light emitting diodes
Nanocrystals
narrow emission
perovskite nanocrystals
Quantum dots
stability
Surfactants
synthesis
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cited_by cdi_FETCH-LOGICAL-c5306-8d92ee226242db8b6f52439cd540d9737fa27d544025d1fdb799e1d37626a8c43
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container_issue 36
container_start_page e2304696
container_title Advanced science
container_volume 10
creator Zhang, Xuanyu
Wang, Qiangqiang
Yao, Zhiwei
Deng, Ming
Wang, Jing
Qian, Lei
Ren, Yong
Yan, Yuying
Xiang, Chaoyu
description Perovskite nanocrystals for light‐emitting diodes are often synthesized by uncontrollable metathesis reactions, suffering from low product yield, nonuniform growth, and poor stability. Herein, by controlling the nucleation kinetics with high dissociation constant (Ka or Kb) acids or bases, homogenous one‐route nucleation of perovskite nanocrystals is achieved as the cluster intermediates are eliminated. The stable, shape uniform, and narrow size distribution green nanocrystals are synthesized. The perovskite nanocrystal film exhibites excellent stability in 80% humidity air with only a 10% photoluminescence intensity drop after 16 h. Efficient and stable electroluminescence is demonstrated with an FWHM of 16 nm at 517 nm. The green devices shows a peak EQE of 24.13% with a lifetime T50 of 54 min at 10 000 cd m−2. Stable green perovskite nanocrystals are synthesized by a modified hot injection method, which control the nucleation and growth process with short‐chain length acids/bases and resurfacing agents. The fabricated green perovskite QLEDs achieves operation stability T50 of 54 min at 10 000 nits with high efficiency exceeding 24%. The peak emission is 517 nm with FWHM of 16 nm.
doi_str_mv 10.1002/advs.202304696
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subjects Acids
Efficiency
Equilibrium
Humidity
LEDs
Ligands
Light emitting diodes
Nanocrystals
narrow emission
perovskite nanocrystals
Quantum dots
stability
Surfactants
synthesis
title Stable Perovskite Quantum Dots Light‐Emitting Diodes with Efficiency Exceeding 24
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