Self-calibrated optical thermometer based on luminescence from SrLuO:Bi,Eu phosphors.

Bi,Eu co-doped SrLuO 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 concentration. Relying on energy transfer process from Bi to Eu and thermal quenching behaviour, the fluorescence intensity ratio (FIR) presents excellent temperature sensing performance. The maximum absolute and relative sensitivities reach 1.10% K and 0.87% K, respectively. These meaningful results indicate that SrLuO:Bi,Eu is a promising material for optical temperature sensing.