论文Non-equivalent Mn4+ doping in mixed-anion host of K3Na(MoO2F4)2·H2O achieving short fluorescence lifetime and intense zero phonon line近日在期刊Journal of Materials Chemistry C上录用。链接https://doi.org/10.1039/D4TC00218K

摘要：

The parity-selection rule for the Mn4+ d→d intra-configurational transition, if being relaxed, would generate Mn4+-doped red-emitting phosphor with short fluorescence lifetime, a desired feature when a phosphor is used in a white light-emitting diode (WLED) lamp applied as backlight in displays. We design non-equivalent substitution of Mn4+ for Mo6+ coordinated with F−/O2− mixed-anions, and obtained K3Na(MoO2F4)2·H2O:Mn4+ red phosphor which exhibits fast decay (luminescence lifetime of ~2 ms) and intense zero phonon line (ZPL) emission at 623 nm (ZPL/ν6 intensity ratio of 65.7% at 300 K) under 470 nm excitation. The local octahedron distortion accounting for the luminescence features was discussed and the crystal field strength and nephelauxetic effect were compared with analogues. The increasing trend of the ZPL/ν6 intensity ratio from 300 K to 80 K was explained, and the luminescence decay of a series of Mn4+ doping concentrations was studuied. The K3Na(MoO2F4)2·H2O:3%Mn4+, when encapsulated with garnet green phosphor on a blue LED, produced a WLED backlight with a wide color gamut above 103.5% of the NTSC standard.