Optical properties and generation of white light in Dy3+-doped lead phosphate glasses

Dy3+-doped lead phosphate (PbPKANDy: P2O5+K2O+Al2O3+PbO+Na2O+Dy2O3) glasses were prepared by melt quenching technique and their optical properties have been studied. Judd-Ofelt parameters have been evaluated for 1.0 mol% Dy2O3-doped lead phosphate glass and inturn derived radiative properties for excited luminescent levels of Dy3+ ions. The yellow-to-blue emission intensity ratios and CIE chromaticity coordinates were calculated which have been used to evaluate white light emission as a function of the activator (Dy3+) ion concentration. The observed non-exponential decay nature and quenching of lifetime for higher Dy3+ ion concentration (≥1.0 mol%) have been attributed due to energy transfer of dipole-dipole type between excited and unexcited Dy3+ ions. The PbPKANDy glasses exhibit better luminescence properties which are suitable for generation of white light.

► Optical properties of Dy3+-doped lead phosphate glasses have been studied. ► Judd-Ofelt analysis reveals higher covalent nature in the present study. ► Chromaticity color coordinates have been evaluated and found in the white-light region. ► Decay rates exhibit exponential nature at lower concentration (≤0.5 mol%). ► The lifetime of the 4F9/2 level decreases with increase in Dy3+ ion concentration.