Defects and self-trapped exciton regulation in rare-earth doped all-inorganic perovskites

By controlling the growth temperature and increasing Er-doping concentration in CsPbCl 3 x Br 3(1− x ) :Er, their emitted PL can be tuned from red (1.82 eV) to near-infrared (1.53 eV) while keeping their intrinsic bandgap without significant variation.