Concentration dependence of luminescence efficiency of Dy³⁺ ions in strontium zinc phosphate glasses mixed with Pb₃O₄

Abstract

In this work we synthesized SrO-ZnO-P O glasses mixed with Pb O (heavy metal oxide) and doped with different amounts of Dy O (0.1 to 1.0 mol%). Subsequently their emission and decay characteristics were investigated as a function of Dy O concentration. The emission spectra exhibited three principal emission bands in the visible region corresponding to F → H (482 nm), H (574 nm) and H (663 nm) transitions. With increase in the concentration of Dy O (upto 0.8 mol%) a considerable increase in the intensity of these bands was observed and, for further increase, quenching of photoluminescence (PL) output was observed. Using emission spectra, various radiative parameters were evaluated and all these parameters were found to increase with increase in Dy O concentration. The Y/B integral emission intensity ratio of Dy ions evaluated from these spectra exhibited a decreasing trend with increase in the Dy O concentration up to 0.8 mol%. Quenching of luminescence observed in the case of the glasses doped with 1.0 mol% is attributed to clustering of Dy ions. The quantitative analysis of these results together with infra-red (IR) spectral studies indicated that 0.8 mol% is the optimum concentration of Dy ions needed to achieve maximum luminescence efficiency. Copyright © 2016 John Wiley & Sons, Ltd.

Physical, optical, thermoanalytical, and radiation response study of Eu2O3-doped zinc fluoro-telluroborate glasses

“…The studies have revealed that, with the increase in rareearth content in the amorphous network, the spacing between the same decreases, which increases the magnitude of quenching in the properties due to ion clustering [3,[27][28][29][30]. Quenching occurs due to energy transfer between rare-earth ions in various network sites as the ion concentration increases.…”