Three‐Dimensional Cuprous Lead Bromide Framework with Highly Efficient and Stable Blue Photoluminescence Emission
Chen Sun, Yahui Guo, Shasha Han, Jing‐Zhao Li, Kuan Jiang, Linfeng Dong, Qi‐Long Liu, Cheng‐Yang Yue, Xiao‐Wu Lei
Abstract
Abstract Considering the instability and low photoluminescence quantum yield (PLQY) of blue‐emitting perovskites, it is still challenging and attractive to construct single crystalline hybrid lead halides with highly stable and efficient blue light emission. Herein, by rationally introducing d 10 transition metal into single lead halide as new structural building unit and optical emitting center, we prepared a bimetallic halide of [(NH 4 ) 2 ]CuPbBr 5 with new type of three‐dimensional (3D) anionic framework. [(NH 4 ) 2 ]CuPbBr 5 exhibits strong band‐edge blue emission (441 nm) with a high PLQY of 32 % upon excitation with UV light. Detailed photophysical studies indicate [(NH 4 ) 2 ]CuPbBr 5 also displays broadband red light emissions derived from self‐trapped states. Furthermore, the 3D framework features high structural and optical stabilities at extreme environments during at least three years. To our best knowledge, this work represents the first 3D non‐perovskite bimetallic halide with highly efficient and stable blue light emission.