Lead-free halide Cs2MnCl4:Cu+ as a new phosphor for efficient green light emission

A new green light-emitting phosphor with a PLQY of 70% was prepared by doping Cu + into Cs 2 MnCl 4 . The WLED packaged by mixing commercial red and blue phosphors with Cs 2 MnCl 4 :0.1Cu + , exhibits a high CRI ( R a = 93) and low CCT (4080 K).