Improving thermal stability of KSrPO4:Tb3+ phosphors prepared by microwave assisted sintering

Abstract In this paper, KSr0.94PO4: Tb 0.06 3 + phosphor was synthesized successfully by microwave assisted sintering method at 1200 °C for 1 h under an air atmosphere. Photoluminescence results show KSr0.94PO4: Tb 0.06 3 + phosphor prepared by microwave assisted sintering method presents an observable improved effect on the enhancement of thermal stability. The emission intensity reduces slowly and marginally by approximately 7% for the maximum emission peak with the temperature increasing from 30 °C to 200 °C indicating great thermal stability KSrPO4:Tb3+ phosphors are. Additionally, the activation energy (ΔE) of thermal quenching of KSrPO4:Tb3+ phosphor was calculated to be 0.2 eV. Moreover, the chromaticity (x, y) located at (0.30, 0.52) was kept without variation when the temperature increased from 30 °C to 200 °C.