Thermoplastic Zero-Dimensional Hybrid Indium Halide Achieving Orange Emission and Scintillation Properties Triggered by Sb³⁺/Mn²⁺ Doping

Organic-inorganic metal halide (OIMH) luminescent materials have attracted much attention due to their chemical diversity. Presented here is a crystalline hybrid indium-based chloride with a relatively rare trigonal bipyramidal [InCl₅]^2- emission center. Through single Sb³⁺ doping, the compound achieves an orange broadband emission at 656 nm with a photoluminescence quantum yield (PLQY) of up to 65.61% at the optimal doping concentration, originating from the radiative recombination of self-trapped excitons, and the effect of Sb³⁺ doping on the luminescence mechanism was investigated through DFT calculations. Interestingly, by codoping Sb³⁺ and Mn²⁺, the as-synthesized compounds exhibit yellow (551 nm) and orange (627 nm) broadband emissions at 270 and 445 nm excitation wavelengths, respectively. The introduction of Mn²⁺ endows the compound with stable scintillator properties. In addition, In-based OIMH luminescent material exhibits excellent processing properties and good smear/scratch recovery ability. This work opens up a new avenue for the preparation of recyclable multifunctional luminescent materials in the future.