Synthesis and luminescence properties of NaSrPO4:Eu2+, Tb3+, Mn2+ for WLED.

In order to obtain a single-host-white-light phosphor used for near ultraviolet (NUV) light emitting diodes (LEDs), the NaSrPO4:Eu2+, Tb3+, Mn2+ powder samples were synthesized via a high temperature solid-state reaction. XRD investigation shows a single phase. Energy transfer processes is discussed by analyzing the photoluminescence (PL) and photoluminescence excitation (PLE) spectra. White light emitting was observed upon the excitation of a wide range of ultraviolet (UV) wavelengths. The emission spectra are made up of blue, green and red emissions from Eu2+, Tb3+ and Mn2+ ions, respectively. The color shift is insignificant when altering the excitation wavelength from 260 nm to 400 nm. This indicates that the phosphor could exhibit good color stability when used in combination with a NUV LED.