Health & Environmental Research Online (HERO)


Print Feedback Export to File
4248899 
Journal Article 
Concentration dependence of luminescence efficiency of Dy3+ions in strontium zinc phosphate glasses mixed with Pb3O4 
Kumar, VR; Giridhar, G; Veeraiah, N 
2017 
1 
Luminescence
ISSN: 1522-7235
EISSN: 1522-7243 
32 
1 
71-77 
English 
27121418 
In this work we synthesized SrO-ZnO-P2O5glasses mixed with Pb3O4(heavy metal oxide) and doped with different amounts of Dy2O3(0.1 to 1.0 mol%). Subsequently their emission and decay characteristics were investigated as a function of Dy2O3concentration. The emission spectra exhibited three principal emission bands in the visible region corresponding to4F9/2 → 6H15/2(482 nm),6H13/2(574 nm) and6H11/2(663 nm) transitions. With increase in the concentration of Dy2O3(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 Dy2O3concentration. The Y/B integral emission intensity ratio of Dy3+ions evaluated from these spectra exhibited a decreasing trend with increase in the Dy2O3concentration 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 Dy3+ions. The quantitative analysis of these results together with infra-red (IR) spectral studies indicated that 0.8 mol% is the optimum concentration of Dy3+ions needed to achieve maximum luminescence efficiency. Copyright © 2016 John Wiley & Sons, Ltd.