Abstract
A series of Tb 3+-, Ce 3+-doped, and Tb 3+/Ce 3+-codoped silicate glasses were synthesized by melt-quenching technique. Some properties of the investigated glasses were characterized by X-ray photoelectron spectroscopy (XPS), photoluminescence (PL), X-ray excited luminescence (XEL) and thermoluminescence (TL) spectra. The result of XPS revealed that both Ce 3+ and Ce 4+ ions coexisted in these silicate glasses, and energy transfer from Ce 3+ to Tb 3+ ions was observed under UV excitation. However, under X-ray excitation the XEL intensity of Tb 3+ emission decreased dramatically upon introduction of CeO 2 to the Tb 3+-doped silicate glass, the higher the content of CeO 2 was, the lower the intensity of Tb 3+ emission was. A proposed TL mechanism was developed based the observed TL and XEL spectra. It was concluded that a cerium-related killer center formed in silicate glass with the introduction of CeO 2, which competed the capture of electrons with Tb 3+ luminescence center under X-ray excitation.
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