Abstract
Mn4+-doped complex fluoride compositions are an important class of phosphors that provide narrow-band 2E→4A2 red emission for liquid crystal display (LCD) backlighting and illumination light emitting diodes (LEDs). In this report, we discuss the high temperature quenching in these phosphors, focusing on the NaKSiF6:Mn4+ phase that has a lower quenching temperature by >75K versus the two end-member compositions, K2SiF6:Mn4+ and Na2SiF6:Mn4+. Measurements of the 2E electron-phonon coupling through line shift versus temperature measurements do not give significant differences between NaKSiF6:Mn4+ and other Mn4+-doped complex fluoride phosphors with higher quenching temperatures. We tentatively attribute the stronger quenching in NaKSiF6:Mn4+ to additional distortion in the excited 4T2 state that is thermally populated from the 2E level at high temperatures. In addition, we discuss potential trade-offs between high temperature luminescence quenching and faster 2E→4A2 emission lifetimes.
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