Abstract
Thermally stimulated luminescence measurements on cerium-doped M 2SiO 5 (M=Lu, Y, Yb, Er) and undoped Lu 2SiO 5, each possessing monoclinic C2/c crystal symmetry, reveal common glow peaks with the principal one occurring near 375 K. In contrast, cerium-doped Gd 2SiO 5, characterized by the monoclinic P2 1/c structure, exhibits a different glow curve with the principal peak occurring near 425 K. Although undoped Lu 2SiO 5 shares the characteristic Ce-doped M 2SiO 5 glow curve, emission spectra data show that it emits weak line-emission, whereas the cerium-doped materials are characterized by the intense Ce 3+ band spectrum. This suggests a common and unique trapping site whose formation does not require the presence of cerium. Application of peak-shape glow curve analysis shows that the characteristic peak near 375 K in each sample obeys first-order kinetics with thermal activation energy approx. 1 eV and frequency factor ∼10 14 s −1. Based on these results, we suggest that the characteristic glow peak is intrinsic and independent of cerium doping. This unique defect is common to the C2/c-structured oxyorthosilicates and is related to the host metal–ion–ligand configuration.
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