Investigations on optical properties of Eu~(3+) ion doped magnesium telluroborate glasses for red laser applications

摘要

Eu~(3+) doped Magnesium telluroborate glasses were prepared with the chemical composition (40-x)H_3BO_3+35 TeO_2+15MgCO_3+10MgF_2+xEu_2O_3 (where x = 0.1, 0.5, 1.0 and 2.0 in wt%) following the melt quenching technique and labeled as MTB0.1Eu, MTB0.5Eu, MTB1.0Eu and MTB2.0Eu respectively. The absorption spectra exhibit seven peaks in the visible and NIR region. Five emission peaks corresponding to the ~5D_0→~7F_J (J=0, 1, 2, 3, 4) transitions were observed while exciting at 465 nm. The luminescence intensity ratio (R) and Ω_2 parameter values were found to be higher for the MTB0.5Eu glass thus indicates the higher asymmetry around the Eu~(3+) ions site compared to other prepared glasses. The CIE color chromaticity coordinates of the present glasses are found to lie in the prominent red region in the chromaticity diagram. The stimulated emission cross-section value of the MTB0.5Eu glass was found to be higher pertaining to the ~5D_0→~7F_2 transition compared to the other prepared glasses and reported literature thus suggests its suitability for red laser applications.