Luminescent properties of Mn4+ in an oxyfluoride complex with ultra-high thermal stability

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:0.15Mn(4+) have an obvious red-shift in contrast to classical fluoride phosphors. Moreover, CVOF:0.15Mn(4+) has extremely good thermal stability and its integral emission intensity at 140 degrees C is 1.77 times higher than the initial value, which meets the requirement of high-power LEDs. A white LED assembled with CVOF:0.15Mn(4+) 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:0.15Mn(4+) could be used as a red component for white LEDs.

Automated summary

In this study, a highly thermally stable oxyfluoride phosphor CVOF:Mn4+ was successfully designed and constructed, exhibiting strong emission characteristics and a red-shift effect, making it suitable as a red component for white LEDs.