Fiber-optic thermometer using strontium aluminate based long afterglow phosphor

Abstract

The effect of trap level in the europium doped strontium aluminate (SrAl2O3:Eu2+) phosphors have been evaluated for the fiber-optic thermometer application. Sensitivity and temperature range of the SrAl2O3:Eu2+ phosphor sensor head vary strongly with the trap depth and the trap density of the phosphors. In the temperature ranging from 273 K to 353 K, SrAl2O4:Eu 2+ co-doped with Dy3+ or Nd3+, which have trap depth at around Et=0.5 eV, is powerful sensor material having large temperature coefficient.