Harnessing Solid-State Ion Exchange for the Environmentally Benign Synthesis of High-Efficiency Mn4+-Doped Phosphors

In this study, a solid-state ion exchange (SSIE) method is proposed to synthesize a series of Mn4+-doped fluoride phosphors, which avoids the use of HF solution during the Mn4+-doping process. The obtained Mn4+-doped fluoride phosphors exhibit strong red emission with a quantum yield of 46%.