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Transparent and colorless Ce3+-activated borogermanate glasses, with the nominal molar composition of 25B2O3-40GeO2-34Gd2O3-1CeO2-0.31Si3N4, were synthesized by melt-quenching method at different melting temperature in 1350-1450 °C region. Both the optical transmittance and X-ray absorption near edge spectroscopy (XANES) results confirm that Ce4+ can be effectively reduced to Ce3+ ions assisted with 0.31 mol% Si3N4 in air. The luminescence behaviour of Ce3+-activated borogermanate glasses excited by ultraviolet and X-ray light and to be dependent on the melting temperature, i.e. the luminescence intensity of Ce3+ ions in borogermante glass increases remarkably with an increasing in melting temperature. The possible enhanced mechanism is discussed by glass density and energy-dispersive spectroscopy (EDS) results.
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Sun et al. (2015) studied this question.
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