Luminescence Studies on Eu3+ Doped Telluro-Borate Glasses for Laser and LED Applications

Abstract

A new series of Eu3+ ions doped telluroborate glasses have been prepared with the chemical composition (55x)B2O3 + 25TeO2 + 10K2O + 10Bi2O3 + xEu2O3 (where x=0, 0.25, 0.5, 0.75, 1 and 2 in wt%) following the melt quenching technique. The Luminescence spectra for all the titled glasses exhibit five emission bands corresponding to the 5D0→7FJ (J=0, 1, 2, 3, 4) transitions located at 577 nm, 592 nm, 613 nm, 652 nm and 702 nm. The Judd-Ofelt intensity parameters have been used to calculate the radiative properties such as transition probability (A), branching ratio (βR), stimulated emission cross-section (P) and radiative lifetime (R) for the various emission transitions of the Eu3+ ions. Luminescence quenching has been observed beyond 1 wt% Eu3+ ions concentration and is due to the interaction takes place between the Eu3+ ions at higher concentration. The decay curves possess single exponential behavior uniformly for all the titled glasses and the experimental lifetime values were obtained following the curve fitting method.