Abstract
Thermal stability is an important parameter of phosphors for high-power LEDs. Herein, we have successfully designed and constructed a novel oxyfluoride phosphor Cs3V2O2F7:Mn4+ (CVOF:Mn4+) with a hexagonal structure. Due to its weaker crystal-field and intensive covalency for Mn4+, both excitation and emission of Mn4+ in CVOF:0.15Mn4+have an obvious red-shift in contrast to classical fluoride phosphors. Moreover, CVOF:0.15Mn4+has extremely good thermal stability and its integral emission intensity at 140 °C is 1.77 times higher than the initial value, which meets the requirement of high-power LEDs. A white LED assembled with CVOF:0.15Mn4+and Y3Al5O12:Ce3+ (YAG) exhibits good photoelectric performances with the color correlated temperature of 5127 K and the color rendering index of 89, showing that CVOF:0.15Mn4+could be used as a red component for white LEDs.
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