H. Aizawa, E. Toba, T. Katsumata, S. Komuro, T. Morikawa
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Fiber-optic thermometer using strontium aluminate based long afterglow phosphor
The effect of trap level in the europium doped strontium aluminate (SrAl/sub 2/O/sub 3/:Eu/sup 2+/) phosphors have been evaluated for the fiber-optic thermometer application. Sensitivity and temperature range of the SrAl/sub 2/O/sub 3/:Eu/sup 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/sub 2/O/sub 3/:Eu/sup 2+/ co-doped with Dy/sup 3+/ or Nd/sup 3+/, which have trap depth at around Et=0.5 eV, is powerful sensor material having large temperature coefficient.
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