Structural and photoluminescence properties of europium oxide doped fluoroborate optical glasses

A sequence of zinc-magnesium-lithium-fluoroborate (ZMLB) optical glasses doped with different Eu3+ concentrations were synthesized through melt quenching technique. The non-crystalline characteristic of the synthesized glasses was proved by X-ray diffraction studies and the FT-IR transmittance spectra have been used to study the various vibrational bands in glass systems. The photoluminescence characteristics were studied under an excitation with 393 nm and it exhibits four emission peaks around at 590, 615, 654 and 700 nm assigned to 5D0→7F1, 5D0→7F2, 5D0→7F3 and 5D0→7F4 electronic transitions of Eu3+ ion, respectively. Color chromaticity values were estimated from luminescence spectra for all the synthesized samples and these parameters indicate the emission in red color region and cold light emission. All these results suggest that the Eu3+ ions doped ZMLB glasses are a potential candidate for red light generation at 615 nm to explore the new material for solid state light emitting diode applications.