Regulation of afterglow and self-trapped exciton emission in indium-based organic metal halides via metal ion doping for multilevel anti-counterfeiting

(Ph 3 S) 2 InCl 5 achieves long afterglow via organic-inorganic hybridization; Bi 3+ /Sb 3+ doping enables tunable phosphorescence for anti-counterfeiting; Sb 3+ doping boosts PLQY from 11.67% to 89.72%, shifting emission to orange.