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

Sb3+ doping strategy has proved to be an effective way to regulate the band gap and improve the photophysical properties of metal halides. Herein, Sb3+-doped lead-free indium halide hybrid InCl6(C4H12N2)(2)Cl center dot H2O:xSb(3+) (0 <= x <= 1) is reported. Upon Sb3+-doping, the weak emission of InCl6(C4H12N2)(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 Sb3+-doped concentration increases. The single crystal X-ray diffraction, excitation wavelengths-dependent emission spectra, and the distortion degree calculation of InCl6(C4H12N2)(2)Cl center dot H2O:xSb(3+) (0 <= x <= 1) indicate that the Sb3+ 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.