Cheng Yuanzhuang, Chen Jiawei, Wu Shan, Zhu Danlei, Liu Xiangyu, Yan Xinghua, Dong Shuyue, Xiong Yaonan, Chen Shulin, Liu Kong, Duan Lian, Ma Dongxin
Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China.
Laboratory of Solid-State Optoelectronics Information Technology, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.
Nano Lett. 2025 Apr 16;25(15):6192-6199. doi: 10.1021/acs.nanolett.5c00453. Epub 2025 Apr 7.
Fabricating high-performance perovskites in ambient air is desirable for low-cost and large-scale patterned manufacture of light-emitting diodes (LEDs). However, perovskites inherently exhibit high sensitivity to moisture and oxygen, which considerably hinders their fabrication under ambient air conditions. Here, we demonstrated an interface-reconstruction strategy which enabled air-processed CsPbI quantum dot (QD) films for high-performance LEDs. Ethyl acetate/tris(1-naphthyl)phosphine oxide (EA/TNPO) treatment was used to polish and passivate the interface between the QD film and the electron transport layer, thereby providing a protective coating against moisture and oxygen. We fabricated LEDs based on the spin-coated QD films, achieving a maximum external quantum efficiency (EQE) of 20.2% and a long half-life of over 100 days. We also fabricated LEDs based on the inkjet-printed QD films, highlighting the practical application potential for patterning techniques. Our work develops high-quality air-processed perovskite films and demonstrates their great prospect for low-cost optoelectronic devices in the future.
在环境空气中制备高性能钙钛矿对于发光二极管（LED）的低成本大规模图案化制造具有重要意义。然而，钙钛矿本身对水分和氧气表现出高度敏感性，这在很大程度上阻碍了它们在环境空气条件下的制备。在此，我们展示了一种界面重构策略，该策略能够制备用于高性能LED的空气处理CsPbI量子点（QD）薄膜。使用乙酸乙酯/三（1-萘基）氧化膦（EA/TNPO）处理来抛光和钝化QD薄膜与电子传输层之间的界面，从而提供防潮和防氧的保护涂层。我们基于旋涂QD薄膜制备了LED，实现了20.2%的最大外量子效率（EQE）和超过100天的长半衰期。我们还基于喷墨打印QD薄膜制备了LED，突出了图案化技术的实际应用潜力。我们的工作开发了高质量的空气处理钙钛矿薄膜，并展示了它们在未来低成本光电器件方面的巨大前景。
