Chen Jiawei, Liu Xiangyu, Cai Bo, Cheng Yuanzhuang, Wen Hao, Zhu Danlei, Xiong Yaonan, Dai Linjie, Yan Xinghua, Xiang Baixu, Luo Xiyu, Feng Wenjing, Du Jiuyao, Dong Shuyue, Shan Qingsong, Chen Shulin, Zeng Haibo, Xiong Qihua, Duan Lian, Ma Dongxin
Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, China.
MIIT Key Laboratory of Advanced Display Materials and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, China.
Nat Commun. 2025 Sep 2;16(1):8201. doi: 10.1038/s41467-025-63684-9.
Perovskite quantum dot light-emitting diodes have rapidly achieved high external quantum efficiencies of over 25%; however, hindered by limited operating stability originating from surface defects or ion migration in quantum dots. Here, we design a lattice-matched anchoring molecule, tris(4-methoxyphenyl)phosphine oxide (TMeOPPO-p), to anchor the multi-site defects and stabilise the lattice. The target quantum dots exhibit high exciton recombination features with near-unity photoluminescence quantum yields (97%), and the as-fabricated quantum dot light-emitting diodes present a maximum external quantum efficiency of up to 27% at 693 nm, a low efficiency roll-off (over 20% at a current density of 100 mA cm for the typical device) and an operating half-life of over 23,000 h. Besides, the air-processed devices maintain a maximum external quantum efficiency of over 26% with good storage stability. We expect this work to exert a profound influence on rational and on-demand molecule design for perovskite QDs, indicating great promise in optoelectronic applications.
钙钛矿量子点发光二极管已迅速实现了超过25%的高外部量子效率；然而，由于量子点中的表面缺陷或离子迁移导致的有限操作稳定性而受到阻碍。在这里，我们设计了一种晶格匹配的锚定分子，三（4-甲氧基苯基）氧化膦（TMeOPPO-p），以锚定多位点缺陷并稳定晶格。目标量子点表现出具有接近单位光致发光量子产率（97%）的高激子复合特性，并且所制备的量子点发光二极管在693nm处呈现出高达27%的最大外部量子效率、低效率滚降（对于典型器件，在100mA cm的电流密度下超过20%）以及超过23000小时的操作半衰期。此外，经过空气处理的器件保持超过26%的最大外部量子效率以及良好的存储稳定性。我们期望这项工作对钙钛矿量子点的合理和按需分子设计产生深远影响，这在光电子应用中显示出巨大的前景。
