Achieving Efficient Red Room-Temperature Phosphorescence in Two-Dimensional Hybrid Halide perovskites by Manganese Doping

Hui Zhu ¹ Suqin Wang ¹ Ming Sheng ¹ Shao Bo ¹ Yu He ¹ Min Li ² Zhuang Liu ^3* Guangtao Zhou ^1*

• ¹ Shandong Xiehe University, Jinan, Shandong, China
• ² Nanjing University of Posts and Telecommunications, Nanjing, Jiangsu Province, China
• ³ Shandong University, Jinan, China

Red room-temperature phosphorescence (RTP), characterized by its long emission wavelength and lifetime, has broad applications in various fields, including bioimaging, light-emitting diodes (LEDs), information encryption, and photodetectors. Two-dimensional (2D) hybrid halide perovskites are a novel class of organic-inorganic hybrid composite materials. Their diverse binary combinations offer a versatile platform for designing energy transfer pathway and introducing emerging optical phenomena, making them promising candidates for developing the next generation of RTP materials. However, currently reported red RTP halide perovskites are scarce and often suffer from low quantum efficiency and short lifetime. Herein, we developed a series of 2D hybrid halide perovskites with efficient red RTP through doping manganese ions and found that the modified materials exhibit a significantly enhanced photoluminescence quantum yield of 66.38%, which is eight times higher than that of the original perovskite host. Moreover, the phosphorescence lifetime can be extended up to 12 ms. In-depth mechanistic investigations reveal that the exceptional luminescent performance originates from efficient energy transfer be-tween the host matrix and manganese ions. Furthermore, red-emitting LEDs have been successfully fabricated with these RTP materials as emitting layers, highlighting the promising applications of 2D hybrid halide perovskites in lighting applications.