Near-infrared emission in barium gallo-germanate glasses containing rare earth ions for broadband optical amplifiers were studied. Among the rare earths, the trivalent praseodymium and cerium ions were selected as an optically active dopants. In order to examine the spectroscopic properties of these glasses doped with Pr3+ and co-doped with Ce3+ and Pr3+ ions the luminescence spectra were registered. The energy transfer processes between cerium and praseodymium ions in barium gallo-germanate glasses have been also investigated. The intense near-infrared luminescence bands corresponding to characteristic transitions of Pr3+ ions in singly and doubly doped glass systems were observed. It has been proved that our glasses exhibit intense 1.5 μm emission originating from 1D2 → 1G4 transition of Pr3+ under direct excitation (445 nm). Moreover, the experimental results indicated that energy transfer between Ce3+ and Pr3+ is not effective for barium gallo-germanate glasses.
White light emitting devices have attracted great attention for their use in liquid crystal monitor screens and white light emitting diodes (W-LEDs). Glasses singly or doubly doped with lanthanide ions may be good white light emitters. In particular, various glass systems containing Pr3+ were studied from this point of view. In this work, germanate glasses doubly doped with Ce3+ and Pr3+ ions were prepared by traditional melt quenchingtechnique. The excitation and emission spectra of lanthanide ions were measured. The emission bands corresponding to characteristics transitions of Pr3+ and transition of Ce3+ ions from 5d level to 4f levels (2F7/2 and 2F5/2) are quite well observed. It indicates that the energy transfer process between Ce3+ and Pr3+ ions in germanate glasses occurs. From the emission spectra, the Commission Internationale de I’Eclairage (CIE) chromaticity coordinates (x, y) were calculated in relation to potential application for white LEDs. Luminescence decay analysis is also presented and discussed in details. The obtained results suggest the possibility of using these Ce3+/Pr3+ co-doped glass systems for future application to white light generation.
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