Harnessing solid-state ion exchange for the environmentally benign synthesis of high-efficiency Mn 4+ -doped phosphors.

In this study, a solid-state ion exchange (SSIE) method is proposed to synthesize a series of Mn 4+ -doped fluoride phosphors, which avoids the use of HF solution during the Mn 4+ -doping process. The obtained Mn 4+ -doped fluoride phosphors exhibit strong red emission with a quantum yield of 46%.