Sun Chen, Guo Ya-Hui, Han Sha-Sha, Li Jing-Zhao, Jiang Kuan, Dong Lin-Feng, Liu Qi-Long, Yue Cheng-Yang, Lei Xiao-Wu
Department of Chemistry and Chemical Engineering, Jining University, Qufu, Shandong, 273155, P. R. China.
College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong, 273165, P. R. China.
Angew Chem Int Ed Engl. 2020 Sep 14;59(38):16465-16469. doi: 10.1002/anie.202006990. Epub 2020 Jul 9.
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 transition metal into single lead halide as new structural building unit and optical emitting center, we prepared a bimetallic halide of [(NH ) ]CuPbBr with new type of three-dimensional (3D) anionic framework. [(NH ) ]CuPbBr exhibits strong band-edge blue emission (441 nm) with a high PLQY of 32 % upon excitation with UV light. Detailed photophysical studies indicate [(NH ) ]CuPbBr 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.
考虑到蓝光发射钙钛矿的不稳定性和低光致发光量子产率（PLQY），构建具有高度稳定且高效蓝光发射的单晶混合铅卤化物仍然具有挑战性且颇具吸引力。在此，通过合理地将d过渡金属引入单铅卤化物中作为新的结构构建单元和光发射中心，我们制备了一种具有新型三维（3D）阴离子骨架的双金属卤化物[(NH ) ]CuPbBr 。[(NH ) ]CuPbBr 在紫外光激发下呈现出强烈的带边蓝光发射（441 nm），光致发光量子产率高达32%。详细的光物理研究表明，[(NH ) ]CuPbBr 还表现出来自自陷态的宽带红光发射。此外，这种三维骨架在至少三年的极端环境中具有高结构稳定性和光学稳定性。据我们所知，这项工作代表了首个具有高效稳定蓝光发射的三维非钙钛矿双金属卤化物。
