Abstract
Triboluminescence spectra have been measured for polycrystalline Sr1-xBaxAl2O4 (0≦x≦1) doped with Eu3+ and Eu2+. The polycrystalline samples of Sr1-xBaxAl2O4:Eu3+,Eu2+ with x=0-0.4 clearly exhibit triboluminescence, while the triboluminescence is hardly observed for Sr1-xBaxAl2O4:Eu3+,Eu2+ with x≧0.5. X-ray diffraction analysis indicates that the crystal structure changes at the composition of x=0.5, suggesting that the triboluminescence in the present materials is closely related to the crystal and/or electronic structures. Also, it has been revealed that SrAl2O4:Eu3+,Eu2+ polycrystal sintered at 1600°C exhibits intense triboluminescence, while it is hardly observed in SrAl2O4:Eu3+,Eu2+ polycrystal sintered at 1350°C.
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