Thermally stable blue-emitting NaSrPO4:Eu2+ phosphor for near UV white LEDs

A novel blue light emitting NaSr1 − xPO4:Eu2+x (x = 0.001 to 0.02) phosphors were prepared by solid-state reaction method to investigate its optical properties and thermal stability for its application in white light-emitting diodes (w-LEDs). The excitation and emission spectra of the prepared phosphor reveal a broad emission peak centered at 460 nm which arises due to 4f–5d transitions of Eu2+ upon the near ultra-violet (n-UV) excitation wavelength at 380 nm. The effect of Eu2+ doping concentration and sintering temperature on the emission intensity of NaSrPO4:Eu2+ was investigated along with its chromaticity coordinates. The temperature dependent luminescence properties of the prepared phosphor show better results than that of the commercial YAG:Ce3+phosphor. Besides, their XRD, FT-IR, SEM, TG, and DTA profiles have also been analyzed to explore its structural details.