Unusual luminescence behavior of Dy 3+-doped lead borate glass after heat treatment

Abstract

Dysprosium-doped lead borate glasses before and after heat treatment have been studied. Lead tungstate PbWO 4 crystallites were identified in lead borate glasses after heat treatment. Luminescence was examined under different excitation wavelengths. Blue luminescence of PbWO 4 crystallites embedded in lead borate glass is observed upon 310 nm excitation. Luminescence spectra measured under excitation at 390 nm consists of two characteristic blue and yellow bands, which correspond to 4F 9/2– 6H 15/2 and 4F 9/2– 6H 13/2 transitions of Dy 3+. Blue band is enhanced and broadened in comparison to yellow 4F 9/2– 6H 13/2 transition, when Dy 3+ and PbWO 4 crystallites in lead borate glass after heat treatment are simultaneously excited by 360 nm line.