In this study, the indirect/direct optical band gaps and spectroscopy properties of Bi /Eu /Yb co-doped ( = 0, 2, 3; and = 2, 3) zinc calcium silicate glasses under different excitation wavelengths were investigated. Zinc calcium silicate glasses with the main compositions of SiO-ZnO-CaF-LaF-TiO were prepared by the conventional melting method. EDS analysis was performed to determine the elemental composition existing in the zinc calcium silicate glasses. Visible (VIS)-, upconversion (UC)-, and near-infrared (NIR)-emission spectra of Bi /Eu /Yb co-doped glasses were also investigated. Indirect optical band gaps and direct optical band gaps of Bi -, Eu - single-doped, and Bi -Eu co-doped SiO-ZnO-CaF-LaF-TiO-BiO-EuF-YbF zinc calcium silicate glasses were calculated and analyzed. CIE 1931(, ) color coordinates for VIS and UC emission spectra of Bi /Eu /Yb co-doped glasses were determined. Besides, the mechanism of VIS-, UC-, NIR-emissions, and energy transfer (ET) processes between Bi and Eu ions were also proposed and discussed.
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| http://dx.doi.org/10.1039/d2ra07310b | DOI Listing |
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