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Abstract Fully amorphous rare earth co-doped barium gallo-germanate glasses were synthesized using the traditional melt quenching-technique. The glass systems were doped with selected pairs of rare earths Dy3+/Ce3+ and Dy3+/Tm3+ ions. To study the spectroscopic properties of gallo-germanate glasses co-doped with Dy3+ and Ln3+ (Ln = Ce, Tm) ions, the luminescence spectra and luminescence decay curves were recorded. It was observed that luminescence bands corresponding to characteristic transitions of Ln3+ (Ln = Ce, Tm) and dysprosium ions are present in the emission spectra measured under direct excitation of Ln3+. The experimental results indicate that energy transfer between dysprosium and cerium/thulium ions is effective. From the emission spectra, the Commission Internationale de I'Eclairage (CIE) chromaticity coordinates (x, y) were calculated in relation to the potential application of gallo-germanate glasses for white LEDs. It has been proved that our glass systems exhibit white emission originating from the simultaneous generation of several bands of Dy3+, Ce3+/Tm3+ under the UV-visible light excitation. Highlights • The rare earth co-doped barium gallo-germanate glasses were synthesized. • The luminescence spectra and luminescence decay curves were registered. • The energy transfer between dysprosium and cerium/thulium ions was examined. • The glass systems exhibit white emission under the UV-visible light excitation. [ABSTRACT FROM AUTHOR]

Fully amorphous lead borate glasses triply doped with Dy 3+ /Tb 3+ /Eu 3+ were synthesized and next studied using optical spectroscopy. The characteristic luminescence bands originating to electronic transitions of Dy 3+ /Tb 3+/ Eu 3+ ions were observed under direct excitation of Dy 3+ . Moreover, the influence of concentration of rare earth ions on spectroscopic properties of lead borate glasses was examined. The obtained experimental results indicate that energy transfer between these rare earth ions is possible. From the emission spectra, the Commission Internationale de I'Eclairage (CIE) chromaticity coordinates (x, y) are calculated in relation to potential application lead borate glasses for white light emitting devices. It has been proved that our glass systems exhibit warm white emission originating from the simultaneous generation of several bands of Dy 3+ , Tb 3+ , Eu 3+ under the UV–visible light excitation. [ABSTRACT FROM AUTHOR]