Abstract
β-Tricalcium phosphate (β-Ca3(PO4)2, β-TCP) and dysprosium-doped β-tricalcium phosphate (β-Ca3(PO4)2:Dy, β-TCP:Dy) phosphor were synthesized. Powder X-ray diffraction, electron spin resonance (ESR), photoluminescence (PL), and thermoluminescence (TL) were measured. Although no PL and TL could be identified for undoped β-TCP, PL and TL were observed for β-TCP:Dy phosphor. The TL emission peaks are assigned to the f–f transitions of the Dy3+ ion which were found to be the same as those of the PL of β-TCP:Dy phosphor. A detailed analysis of the TL peak shape can give information on the trap depth (activation energy ε), indicating the trap depth of ε=1.1eV from Hoogenstraaten's method. We succeeded in detecting the stable trapped hydrogen atom in the X-ray-irradiated β-TCP:Dy phosphor at room temperature for several months using ESR. The TL phenomenon of β-TCP:Dy phosphor is related with these trapped hydrogen atoms.
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