Air stable and highly efficient Bi-doped CsSnCl for blue light-emitting diodes.

CsSnCl perovskite has recently attracted attention as a promising optoelectronic material owing to its better stability and reduced toxicity than its lead counterparts. However, its luminescence performance hardly satisfies the requirements. Hence, a series of Bi-doped CsSnCl (CsSnCl:Bi) with enhanced luminescence were synthesized by a solution-phase route.