LAUSR

Abstract A detailed study on optical as well as structural properties of 1 mol % Tb3+ ions doped 2% B2O3 + 5% ZnO +30% PbO +62% P2O5 glass has been reported in this paper. In order to explore the structural properties of the glass we have studied XRD, FTIR and Raman spectra. The spectroscopic characteristics have been investigated by analysing the absorption spectra, photoluminescence spectra, fluorescence decay profile and CIE color chromaticity. The optical band gaps are also estimated. The absorptions are obtained in the UV–Visible–NIR region and among them the most prominent peak is found at around 376 nm related to 7F6 → (5D3, 5G6) transition. The excitation spectra also exhibits that the potentially strong and intense excitation occurs at 376 nm, corresponding to (5D3, 5G6) multiplets, and hence to perform the photoluminescence measurements this energy has been utilized as excitation energy. The emission spectra, recorded at room temperature indicate eleven emissions, including a comparatively strong and intense peak at 541 nm which emits strong green color as a consequence of 5D4 → 7F5 transition. By the proper fitting of the luminescence decay profile, we have calculated the experimental lifetime of the excited state. Other radiative parameters are also obtained by evaluating the best set of Judd-Ofelt parameters. The CIE color chromaticity shows the high color purity (71.8%). Our investigation reveals that the glass sample produces higher quantum efficiency of 80% and it strongly indicates it's suitability in production of strong green color emitting laser material.