Fiber-optic thermometer using strontium aluminate based long afterglow phosphor

The effect of trap level in the europium doped strontium aluminate (SrAl(2)O(3):Eu(2+)) phosphors have been evaluated for the fiber-optic thermometer application. Sensitivity and temperature range of the SrAl(2)O(3):Eu(2+) 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, SrAl(2)O(4):Eu(2+) co-doped with Dy(3+) or Nd(3+), which have trap depth at around Et=0.5 eV, is powerful sensor material having large temperature coefficient.