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 d¹⁰ transition metal into single lead halide as new structural building unit and optical emitting center, we prepared a bimetallic halide of [(NH₄)₂]CuPbBr₅ with new type of three‐dimensional (3D) anionic framework. [(NH₄)₂]CuPbBr₅ exhibits strong band‐edge blue emission (441 nm) with a high PLQY of 32 % upon excitation with UV light. Detailed photophysical studies indicate [(NH₄)₂]CuPbBr₅ 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.

中文翻译：

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具有高效率和稳定的蓝色光致发光发射的三维铜溴化铅框架。

考虑到发蓝光钙钛矿的不稳定性和低光致发光量子产率（PLQY），构建具有高度稳定和高效蓝光发射的单晶混合卤化铅仍然具有挑战性和吸引力。在此，通过合理地将d ¹⁰过渡金属引入单卤化铅作为新的结构构建单元和光发射中心，我们制备了具有新型三维（3D）阴离子骨架的[（NH ₄）₂ ] CuPbBr ₅双金属卤化物。。[（NH ₄）₂ ] CuPbBr ₅紫外光激发时，具有强的带边蓝色发射（441 nm）和32％的高PLQY。详细的光物理研究表明，[（NH ₄）₂ ] CuPbBr ₅也显示出自陷态产生的宽带红光发射。此外，3D框架至少在三年内在极端环境下具有很高的结构和光学稳定性。就我们所知，这项工作代表了首个具有高效且稳定的蓝色发光的3D非钙钛矿双金属卤化物。