The Luminescence Characterization and Thermal Stability of Eu 2+ Ions‐Doped NaBaPO 4 Phosphor

The Eu 2+ ‐doped NaBaPO 4 phosphor was prepared by high‐temperature solid‐state reaction. The photoluminescence excitation and emission spectra and the luminescence quantum efficiency of Eu 2+ ions were investigated. The dependence of luminescence intensity on temperatures and the temperature‐dependent decay times of Eu 2+ ions doped in NaBaPO 4 were measured and discussed. The natures of the Eu 2+ emission in NaBaPO 4 , e.g., the Stokes shift, the luminescence quenching temperature ( T 0.5 ), the activation energy for thermal quenching (δ E ) were reported. In addition, the crystal structure and the site occupancy of Eu 2+ ions doped in NaBaPO 4 crystal lattice were discussed. Two different Eu 2+ centers were assigned according to the crystal structure and the luminescence characteristics of Eu 2+ ions. The phosphor shows an excellent thermal stability on temperature quenching effects. With the increasing of temperature, the emission bands show the abnormal blue‐shift.