相沢 宏明; 久保 広美; 勝亦 徹; 小室 修二; 森川 滝太郎; 鳥羽 栄治
日本結晶成長学会誌 2003年07月
Various rear-earth doped SrAl_2O_4:Eu,Ln and CaAl_2O_4:Eu,Ln crystals have been grown by floating zone technique. Temperature dependence of photoluminescence lifetime and afterglow intensity from SrAl_2O_4 :Eu,Ln and CaAl_2O_4:Eu,Ln crystals are evaluated for the fiber-optic thermometer application. The lifetime of SrAl_2O_4:Eu, Dy and CaAl_2O_4:Eu,Dy crystal greatly vary with temperature. Lifetimes and temperature coefficients of the SrAl_2O_4:Eu,Dy (222 μs/K) and CaAl_2O_4:Eu,Dy (-169 μs/K) crystal were over 10 times larger than that of the ruby crystals (-10 μs/K).