Effect of Eu3+ on luminescence property in LiBaGdSi glass

Abstract

The aims of this research, study the optical and luminescence properties of LiBaGdSi glasses doped with Eu3+ ions. The glass sample were prepared (50-x)SiO2 : 25Li2O : 20BaO : 5Gd2O3 : xEu2O3 where x was concentration of (0.0, 0.1, 0.5, 1.0, 1.5 and 2.0 mol%) using conventional melt-quenching technique. The results found that absorption spectra in the wavelength from 200 to 2,500 nm revealed six absorption peaks are assigned to the transition from the bottom of 7F0 and 7F1 to 5L6 (394 nm) 5D2 (464 nm) 5D2 (531 nm) 5D0 (583 nm) 7F6 (2090 nm) and 7F6 (2208 nm). The absorbance spectrum of glass samples were absorbed in the ultraviolet, visible light range up to the infrared range. with a wavelength of 200 to 2,500 nm, then the glass sample is light red. The excitation spectra of LiBaGdSi glasses were performed to know the emission wavelength, which were obtained by monitoring the emission with 613 nm. The excitation spectra consisted of seven are assigned to the transition from the bottom of 7F0 to 5D4 (363 nm) 5L7 (382 nm) 5L6 (394 nm) 5D3 (414 nm) 5D2 (414 nm) 5D1 (526 nm) and transition from 7F1 to 5D2 (533 nm). The highest intensity of excitation peaks about 394 nm, which corresponds to changing the energy level from floor state 7F0 to 5L6. Hence it was chosen as excitation wavelength to study the emission spectra. The emission spectra contained two emission bands at 550 and 750 nm, which correspond to the 5D0 → 2F7 transitions. The emission spectra at 613 nm is the most intense band in this glass system. In addition, the result found that the quenching concentration was found at 1.0 mol% of Eu2O3 concentration.