Hou Wuyan, Li Lichao, Liu Chang, Ding Boying, Cui Jiahao, Chen Longni, Qiu Yuan, Jiao Zhiqiang, Zhang Juan, Yin Shougen, Wu Xiaoming
Ministry of Education and Tianjin Key Laboratory for Photoelectric Materials and Devices, National Demonstration Center for Experimental Function Materials Education, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.
Tianjin Key Laboratory of Quantum Optics and Intelligent Photonics, School of Science, Tianjin University of Technology, Tianjin 300384, China.
ACS Appl Mater Interfaces. 2025 Aug 13;17(32):45958-45967. doi: 10.1021/acsami.5c09121. Epub 2025 Aug 3.
As an essential component in blue perovskite light-emitting diodes (PeLEDs), functionally tailored hole transport materials (HTMs) play a decisive role in reducing the hole injection barrier, mitigating interfacial defects, and thus enhancing device performance. Herein, we report two solution-processable D-π-A hemicyanine dyes, which exhibit asymmetric/symmetric configurations and contain electron-withdrawing groups and Lewis base donors. As multifunctional HTMs, two dyes not only present high hole mobilities with improved energy level alignment in PeLEDs, but also enable the perovskite defects passivation and phases manipulation. Interestingly, the symmetric dye achieves dual-channel hole injection and multisite anchoring for the quasi-2D perovskite (PEACsPbBrCl). The passivated perovskite film forms an augmented distribution of large phases and suppressed small phases, thereby promoting radiative exciton recombination. Consequently, symmetric dye-treated PeLED exhibits an impressive blue electroluminescence (EL) with a maximum luminance reaching 5842 cd m, a peak external quantum efficiency (EQE) of 13.71% and an improved operational half lifetime (T) of 6.7 min at 100 cd m, demonstrating its performance advantages over the reported PEACsPb(BrCl) PeLEDs. This work provides an innovative perspective for designing multifunctional HTMs by conformation engineering and gains insight into the interfacial contact for high performance perovskite optoelectronics.
作为蓝色钙钛矿发光二极管（PeLEDs）的重要组成部分，功能定制的空穴传输材料（HTMs）在降低空穴注入势垒、减轻界面缺陷从而提高器件性能方面起着决定性作用。在此，我们报道了两种可溶液加工的D-π-A半菁染料，它们呈现不对称/对称构型，并含有吸电子基团和路易斯碱供体。作为多功能HTMs，这两种染料不仅在PeLEDs中具有高的空穴迁移率并改善了能级排列，还能实现钙钛矿缺陷的钝化和相的调控。有趣的是，对称染料实现了准二维钙钛矿（PEACsPbBrCl）的双通道空穴注入和多位点锚定。钝化后的钙钛矿薄膜形成了增强的大相分布和抑制的小相分布，从而促进辐射激子复合。因此，经对称染料处理的PeLED表现出令人印象深刻的蓝色电致发光（EL），最大亮度达到5842 cd m，峰值外量子效率（EQE）为13.71%，在100 cd m下的工作半衰期（T）提高到6.7分钟，证明了其相对于已报道的PEACsPb(BrCl) PeLEDs的性能优势。这项工作为通过构象工程设计多功能HTMs提供了创新视角，并深入了解了高性能钙钛矿光电器件的界面接触。
