Author : P.Sree Ram Naik, Y.N.Ch.Ravi Babu, M. Kiran Kumar and A.Suresh Kumar

Dy3+:PbO-Bi2O3-WO3-B2O3 glass systems have been developed using Melt quenching technique. Spectroscopic and Physical properties of these glass systems have been investigated. The nephalauxetic effects for all the glass systems have been computed. The physical properties such as density (d), molar volume (V), polaron radius (rp), refractive index (n), inter ionic distance (ri) have been evaluated. The Judd-Ofelt theory has been applied to the analysis of absorption spectra. The environment sensitive Ω2 parameter exhibits higher among the other Judd – Ofelt parameters indicate the asymmetry around the rare earth ions in all the glass systems. The radiative lifetimes (τR)for certain lasing transitions have been computed. Branching ratios (βr), absorption (σa) and emission cross sections (σe) for certain lasing transitions
have been reported. The visible luminescence spectra exhibit two intense bands around 480nm, 560nm due to 4F9/2- →6H15/2(Blue) and 4F9/2→ 6H13/2 (Yellow) transition of Dy3+. Yellow to blue luminescence ratio (Y/B) for all the glass systems indicate greater than unity.

Keywords: Dysprosium, HMO glasses, Optical materials, photoluminescence.

Article published in International Journal of Current Engineering and Technology, Vol.4, No.5 (Oct-2014)