Luminescence investigations on Dy3+ doped CdO-PbF2 phosphate glass-ceramics

Abstract

• P 2 O 5 – CdO – PbF 2 -SrO – Dy 2 O 3 glass and the corresponding glass-ceramics were prepared. • Existence of PbF 2 crystallites and their structural confirmations were done by X-ray diffraction studies. • Effect of heat treatment on luminescence was discussed. • Decrease in luminescence intensity in presence of nanocrystals in glass ceramics was reported This paper reports the structural and photoluminescence investigations on Dy 3+ doped transparent CdO-PbF 2 phosphate glass/glass ceramics with SrO. Upon heat treatment, the nanocrystals occurred in glass ceramics are spherical in shape in the sizes of 10nm to 20nm. The luminescence intensities were strongly dependent on nanocrystallinity and showing the same kinetics as efficient luminescent hosts. In the present host, well incorporation of Dy 3+ ions in nanocrystals and low energy transfer to Dy 3+ ions due to existence of other crystalline phases, both the mechanisms occurred. The consequent variations in luminescence intensities also observed.