Self-calibrated optical thermometer based on luminescence from SrLu(2)O(4):Bi(3+),Eu(3+) phosphors

Bi(3+),Eu(3+) co-doped SrLu(2)O(4) phosphors were synthesized by a solid state reaction method. Their structural, luminescent and temperature sensing properties have been systematically investigated. The color-tunable emissions from violet to red were detected with the increase of Eu(3+) concentration. Relying on energy transfer process from Bi(3+) to Eu(3+) and thermal quenching behaviour, the fluorescence intensity ratio (FIR) presents excellent temperature sensing performance. The maximum absolute and relative sensitivities reach 1.10% K(−1) and 0.87% K(−1), respectively. These meaningful results indicate that SrLu(2)O(4):Bi(3+),Eu(3+) is a promising material for optical temperature sensing.