Antimony‐Doped Lead‐Free Zero‐Dimensional Tin(IV)‐Based Organic–Inorganic Metal Halide Hybrids with High Photoluminescence Quantum Yield and Remarkable Stability

Abstract Lead‐free organic–inorganic metal halide perovskites have attracted wide attention owing to their outstanding photophysical properties. Herein, a new type of antimony‐doped 0D tin(IV)‐based organic–inorganic metal halide hybrid (C 10 H 16 N 2 )SnCl 6 :Sb with highly efficient luminescence and remarkable stability is reported. Upon photoexcitation, the prepared samples exhibit an ultrabroadband emission ranging from 400 to 900 nm with two centers at 500 and 660 nm, which originate from free excitons and self‐trapped excitons, respectively. Such 0D metal halide hybrids with ultrabroadband emission covering the entire visible spectrum are rare. Especially, the photoluminescence quantum yield (PLQY) of red emission is as high as 77% upon 345 nm ultraviolet excitation. More importantly, (C 10 H 16 N 2 )SnCl 6 :Sb exhibits relatively good stability. It can still maintain 90% photoluminescence intensity after one week of 365 nm ultraviolet irradiation. Simultaneously, its PL intensity still retains 61% of room temperature emission intensity at 400 K. This work provides a new direction for the development of 0D organic–inorganic metal halide hybrids with excellent performance.