Tunable Luminescence on Indium Halide Hybrid Regulated by Sb3+ Doping Concentration

Abstract Sb 3+ doping strategy has proved to be an effective way to regulate the band gap and improve the photophysical properties of metal halides. Herein, Sb 3+ ‐doped lead‐free indium halide hybrid InCl 6 (C 4 H 12 N 2 ) 2 Cl·H 2 O: x Sb 3+ (0 ≤ x ≤ 1) is reported. Upon Sb 3+ ‐doping, the weak emission of InCl 6 (C 4 H 12 N 2 ) 2 Cl experiences a significant enhancement in emission intensity with near‐unity photoluminescence quantum yield (PLQY). The photophysical data fitted by the power‐law equation verifies self‐trapped exciton emission for the broadband emission. Interestingly, the emission experiences a gradual red‐shift with emission color changing from green to yellow and finally to orange as the Sb 3+ ‐doped concentration increases. The single crystal X‐ray diffraction, excitation wavelengths‐dependent emission spectra, and the distortion degree calculation of InCl 6 (C 4 H 12 N 2 ) 2 Cl·H 2 O: x Sb 3+ (0 ≤ x ≤ 1) indicate that the Sb 3+ concentration dependent luminescence results from the synergistic effect of crystal phase transition, change of luminescence center, and the distortion of crystal structure. This achievement represents a successful strategy to achieve the photophysical properties modulation of metal halides for versatile optical applications.