Experimental Design of (Cs,Rb)2Sn(Bi)Cl6 Blue Phosphors by Cation-Substitution-Induced Lattice Strain

Blue self-trapped-exciton photoluminescence of (Cs x Rb 1− x ) 2 Sn y Bi 1− y Cl 6 perovskites is affected by lattice strain from Cs/Rb and Sn/Bi substitutions, the emission intensity and dynamics correlating with the strain magnitude.