近日，电子科技大学陶斯禄团队研究了超低效率滚降高色纯度蓝色钙钛矿量子点LED，效率超过20%。相关论文于2026年3月16日发表在《光：科学与应用》杂志上。

蓝色钙钛矿量子点发光二极管对于新一代高清显示极具吸引力，但其在高亮度（>4000坎德拉每平方米）下维持高色纯度（国际照明委员会色坐标y<0.1）时存在严重的效率滚降问题，阻碍了实际应用。这种滚降主要源于裸露悬挂键、强量子点间耦合以及低介电常数所导致的非辐射损失。

为攻克这一难题，研究组开发了利用1-乙基-3-甲基咪唑六氟磷酸盐（EMIMPF₆）的多功能分子钝化策略。[PF₆]^-阴离子与铅悬挂键、铯位点配位并减弱耦合，而[EMIM]⁺阳离子则抑制溴相关缺陷并阻碍俄歇复合，共同减少了激子猝灭路径。该处理使量子点薄膜的光致发光量子产率从78%提升至92%，并在472纳米处实现了光谱高色纯度的蓝光发射（国际照明委员会色坐标y = 0.091）。

关键在于，所得器件在6441坎德拉每平方米亮度下实现了超过20%的创纪录外量子效率，在9587坎德拉每平方米下仍保持18.47%的外量子效率，且效率滚降近乎消除，代表了国际照明委员会色坐标y < 0.1的蓝色钙钛矿量子点发光二极管迄今最佳性能。此外，与以往报道相比，器件工作寿命提升了一个数量级。

附：英文原文

Title: Ultra-Low Efficiency Roll-Off High Color Purity Blue Perovskite Quantum Dot LEDs with Exceeding 20% Efficiency

Author: Xie, Mingyuan, Bi, Chenghao, Wei, Shibo, Jiang, Zhentao, Li, Guo, Li, Hangren, Zhang, Yong, Zhao, Feng, Li, Meng-Jiao, Lin, Hui, Wang, Ya-Kun, Liao, Liang-Sheng, Tao, Silu

Issue&Volume: 2026-03-16

Abstract: Blue perovskite quantum dot light-emitting diodes (QLEDs) are highly attractive for new generation high-definition displays, but their practical deployment is hindered by severe efficiency roll-off at high brightness (>4000cdm2) while maintaining high color purity (CIEy<0.1). This roll-off arises mainly from non-radiative losses induced by exposed dangling bonds, strong inter-dot coupling, and low permittivity. To conquer this challenge, we develop a multifunctional molecule passivation strategy utilizing 1-ethyl-3-methylimidazolium hexafluorophosphate (EMIMPF). The [PF] anions coordinate with lead dangling bonds, cesium sites, and weaken coupling, while [EMIM] cations suppress bromine-related defects and inhibit Auger recombination, collectively reducing exciton quenching pathways. This treatment increases the photoluminescence quantum yield of QD films from 78% to 92% and enables spectrally high color purity blue emission at 472nm (CIEy = 0.091). Crucially, the resulting devices deliver a record-high external quantum efficiency (EQE) exceeding 20% at 6441cdm2 and maintain 18.47% EQE at 9587cdm2 with nearly eliminated roll-off, representing the best performance to date for blue perovskite QLEDs (CIEy<0.1). Moreover, the operational lifetime improves by an order of magnitude compared with previous reports.

DOI: 10.1038/s41377-026-02231-7

Source: https://www.nature.com/articles/s41377-026-02231-7