Chen Jiawei, Chen Shulin, Liu Xiangyu, Zhu Danlei, Cai Bo, Luo Xiyu, Feng Wenjing, Cheng Yuanzhuang, Xiong Yaonan, Du Jiuyao, Li Zhou, Zhang Dongdong, Duan Lian, Ma Dongxin
Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China.
Changsha Semiconductor Technology and Application Innovation Research Institute, College of Semiconductors (College of Integrated Circuits), Hunan University, Changsha 410082, China.
Sci Adv. 2025 Mar 14;11(11):eads7159. doi: 10.1126/sciadv.ads7159.
Perovskite quantum dots (QDs) show an excellent application perspective in semiconductor optoelectronic devices. However, problems of ligand loss during the growth, purification, film formation, and storage process always induce the aggregation and ripening of QDs, adversely affecting QDs' and QD-based devices' performance. Here, we use a bidentate molecule to control ripening toward a notable performance boost in CsPbI QDs. The strong interaction between QDs and the bidentate molecules maintains stable surface states of QDs, inhibiting QDs' undesirable ripening and generation of defects. We fabricate QD-based light-emitting diodes (LEDs) with a maximum external quantum efficiency (EQE) of 26.0% at 686 nm and an operating half-life of 10,587 hours at an initial radiance of 190 mW sr m (equivalent to a luminance of 100 cd m for green perovskite LEDs). Benefiting from the high storability of the target QDs, the as-fabricated devices based on the QD solution storing for 1 month show a maximum EQE of 21.7% (20.3% for 3 months).
钙钛矿量子点（QDs）在半导体光电器件中展现出优异的应用前景。然而，在生长、纯化、成膜和存储过程中配体损失的问题总是会导致量子点的聚集和熟化，对量子点及基于量子点的器件性能产生不利影响。在此，我们使用一种双齿分子来控制熟化过程，以显著提升CsPbI量子点的性能。量子点与双齿分子之间的强相互作用维持了量子点稳定的表面状态，抑制了量子点不期望的熟化和缺陷的产生。我们制备了基于量子点的发光二极管（LED），在686 nm处的最大外量子效率（EQE）为26.0%，在初始辐射强度为190 mW sr⁻¹ m⁻²（相当于绿色钙钛矿LED的亮度为100 cd m⁻²）时的工作半衰期为10587小时。受益于目标量子点的高存储稳定性，基于存储1个月的量子点溶液制备的器件显示出最大EQE为21.7%（存储3个月时为20.3%）。
