近日，浙江大学金一政团队研究了水致高性能量子点发光二极管。相关论文发表在2025年9月10日出版的《自然—光子学》杂志上。
溶液处理发光二极管（LED）因其在低成本制造大面积器件方面的潜力而具有吸引力。然而，溶液处理的蓝色LED的性能有限，特别是其使用寿命短，阻碍了它们在显示技术中的实际应用。
研究组证明了设备中的微量水——以前被认为对大多数溶液处理的LED有害——极大地提高了量子点LED的性能。这一突破源于他们对正老化现象的全面机制研究，这是量子点LED领域的一个长期难题。该研究结果表明，由氧化锌基纳米粒子组成的电子传输层表面的水钝化通过抑制器件运行过程中的空穴泄漏来改善电荷传输并增强激子辐射复合。
结合先进的顶部发射架构，该蓝色量子点LED实现了37.1 cd A-1的高电流效率，蓝色指数（色坐标校正电流效率）超过490 cd A−1以及前所未有的稳定性，外推T95寿命（初始亮度为1000 cd m−2）为287 h。该工作可能会激发对纳米晶功能层表面钝化的进一步探索，这对新兴的溶液处理光电子和电子器件的发展至关重要。
附：英文原文
Title: Water-induced high-performance quantum-dot light-emitting diodes
Author: Jin, Wangxiao, He, Siyu, Lu, Xiuyuan, Zhu, Xitong, Liu, Dijiong, Sun, Guolong, Hao, Yanlei, Chen, Zuyan, Wang, Chenyang, Zeng, Jiejun, Zheng, Zhi, Yan, Xiaolin, Yan, Yiran, Wu, Longjia, Lin, Xiongfeng, Hou, Wenjun, Cao, Weiran, Liu, Chuan, Liang, Xiaoci, Gao, Yuan, Deng, Yunzhou, Cao, Kaisheng, Yang, Yingguo, Gao, Feng, Jin, Yizheng
Issue&Volume: 2025-09-10
Abstract: Solution-processed light-emitting diodes (LEDs) are appealing for their potential in the low-cost fabrication of large-area devices. However, the limited performance of solution-processed blue LEDs, particularly their short operation lifetime, is hindering their practical use in display technologies. Here we demonstrate that trace water in the device—previously considered detrimental to most solution-processed LEDs—dramatically enhances the performance of quantum-dot LEDs. This breakthrough stems from our comprehensive mechanism investigations into the positive aging phenomenon, a long-standing puzzle in the quantum-dot LED field. Our findings reveal that water passivation on the surface of electron-transporting layers, which are composed of zinc-oxide-based nanoparticles, improves charge transport and enhances exciton radiative recombination by suppressing hole leakage during device operation. Combined with the advanced top-emitting architecture, our blue quantum-dot LEDs achieve a high current efficiency of 37.1cdA1, a blue index (colour-coordinate-corrected current efficiency) of over 490cdA1 CIE-1y and unprecedented stability, with an extrapolated T95 lifetime (at an initial brightness of 1,000cdm2) of 287h. Our work may inspire further exploration into surface passivation of nanocrystalline functional layers, critical for the advancement of emerging solution-processed optoelectronic and electronic devices.
DOI: 10.1038/s41566-025-01757-3
Source: https://www.nature.com/articles/s41566-025-01757-3