White-light defect emission and enhanced photoluminescence efficiency in a 0D indium-based metal halide

A white-emissive metal halide (C 6 H 8 N) 6 InBr 9 with inferior luminescence due to a severe thermal quenching effect has been developed. By doping with Sb 3+ ions, this effect was effectively suppressed, improving the luminous efficiency up to 71.84%.