Li Wan, Li Tianxiang, Tong Yu, Qi Heng, Zhang Youqian, Guo Yangyang, Wang Hao, Wang Hongyue, Wang Kun, Wang Hongqiang
State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi'an 710072, China.
School of Microelectronics, Northwestern Polytechnical University, Xi'an 710072, China.
ACS Appl Mater Interfaces. 2023 Aug 2;15(30):36602-36610. doi: 10.1021/acsami.3c07140. Epub 2023 Jul 19.
Perovskite light-emitting diodes (LEDs) have attracted extensive attention in recent years due to their outstanding performance and promise in lighting and display applications. However, the fabrication of perovskite LEDs usually requires a low-humidity atmosphere, which is unfavorable for industrial production. Herein, we report an effective strategy to fabricate highly luminescent quasi two-dimensional CsPbBr perovskite films in an ambient atmosphere with a humidity up to 60%. We reveal that the hole transport layer (HTL) plays a significant role in the morphology and optical properties of the perovskite films. Using hydrophobic self-assembled monolayer materials as HTLs can remarkably improve the quality of the perovskite films processed in high humidity air. The resultant perovskite LEDs show reduced leakage current and significantly enhanced performance. Furthermore, surface treatment is conducted to prevent water invasion and promote radiative recombination in perovskite films and LEDs. Eventually, the perovskite LEDs exhibit bright green emission with an external quantum efficiency of 4.87%. The present work provides a feasible pathway to overcome the humidity limitation for obtaining bright perovskite films and LEDs, which would contribute to further reducing the fabrication cost of perovskite LEDs and promoting their applications.
近年来，钙钛矿发光二极管（LED）因其出色的性能以及在照明和显示应用中的潜力而备受关注。然而，钙钛矿LED的制备通常需要低湿度环境，这不利于工业化生产。在此，我们报道了一种有效的策略，可在湿度高达60%的环境气氛中制备高发光的准二维CsPbBr钙钛矿薄膜。我们发现空穴传输层（HTL）在钙钛矿薄膜的形貌和光学性质中起着重要作用。使用疏水性自组装单分子层材料作为HTL可显著提高在高湿度空气中制备的钙钛矿薄膜的质量。所得的钙钛矿LED显示出泄漏电流降低且性能显著增强。此外，进行表面处理以防止水侵入并促进钙钛矿薄膜和LED中的辐射复合。最终，钙钛矿LED呈现出明亮的绿色发射，外量子效率为4.87%。本工作提供了一条可行的途径来克服湿度限制，以获得明亮的钙钛矿薄膜和LED，这将有助于进一步降低钙钛矿LED的制造成本并促进其应用。
