Thermally Stable Blue NaBaPO<sub>4</sub>: Eu<sup>2+</sup> Phosphor Synthesized by Combustion Method

A blue-emitting phosphor, NaBaPO 4 :Eu2+, was prepared by solution combustion synthesis method, and its luminescence properties were investigated in detail. It was found that NaBaPO 4 :Eu 2+ could be efficiently excited by the UV-visible light of 230-420 nm and exhibited bright blue emission, which matched well with the emission wavelength of near-UV LED chips. NaBaPO 4 :Eu 2+ showed high thermally stable luminescence compared to commercial phosphor YAG:Ce 3+ . With the increase of the temperature, the normalized emission intensity of NaBa 0.98 PO 4 :0.02Eu 2 + decreased to 92.3% of the initial value at 423 K, and the emission band exhibited a little blue-shift.