Synthesis, broad-band absorption and luminescence properties of blue-emitting phosphor Sr8La2(PO4)6O2:Eu2+ for n-UV white-light-emitting diodes

Abstract A novel blue-emitting phosphor Sr8La2(PO4)6O2:Eu2+ was synthesized via the conventional high-temperature solid-state method and its photoluminescence (PL) properties were investigated for application in white light-emitting diodes. The phosphor exhibited strong broad absorption band in the near ultraviolet (n-UV) range, and generated bright blue emission centered at 442 nm upon 365 nm excitation light. The critical Eu2+ quenching concentration (QC) mechanism was verified to be the dipole–dipole interaction. The fluorescence decay curves, temperature dependence photoluminescence and CIE value of Sr8La2(PO4)6O2:Eu2+ phosphors were discussed. The above results indicated that Sr8La2(PO4)6O2:Eu2+ phosphor is a good candidate as a blue component for potential application in UV-excited w-LEDs.