• Silver lead borate glasses doped with europium ions for phosphors applications

• # Fulltext

https://www.ias.ac.in/article/fulltext/boms/040/04/0859-0863

• # Abstract

Europium (Eu$^{3+}$) doped silver lead borate glasses with the composition of $x$Eu$_2$O$_3$−($1 − x$)Ag$_2$O−29PbO−70B$_2$O$_3$ ($x = 0$, 0.1, 0.2, 0.3, 0.4 and 0.5 mol%) have been successfully prepared by conventional meltquenching method. Thermal, structural and luminescence properties have been studied using thermograms, transmittance,excitation and emission spectra. From the differential scanning calorimetry studies, the glass transition temperatures ($T_g$)have been investigated and their values are ranging from 449 to 458$^{\circ}$C. The investigation of Fourier transformer infraredspectra shows the presence of boron atoms in both BO$_3$ and BO$_4$ units in the glass network. In addition, it was foundthat new structural groups were present, such as boroxyl rings, pyro and dipenta-borate. Photoluminescence spectroscopywas used to examine down conversion emission under 394 nm excitation, which exhibits five emission bands centred at577, 590, 612, 650 and 697 nm corresponding to ${}^5$D$_0$−${}^7$F$_0$, ${}^5$D$_0$−${}^7$F$_1$, ${}^5$D$_0$−${}^7$F$_2$, ${}^5$D$_0$−${}^7$F$_3$ and ${}^5$D$_0$−${}^7$F$_40$ transitions ofEu$^{3+}$ ions, respectively. The Commission International de I’Eclairage France 1931 chromaticity coordinates estimatedfrom the emission spectra; it was shown that a 0.5 mol% Eu$_2$O$_3$ doped glass is quite suitable for efficient red phosphors application.

• # Author Affiliations

1. Department of Physics, Bangalore University, Bangalore 560056, India

• # Bulletin of Materials Science

Current Issue
Volume 42 | Issue 5
October 2019