Effect of Dy3+ ions concentration on optical properties of lead borosilicate glasses for white light emission

Abstract Lead borosilicate (LBS) glasses doped with different concentrations of Dy 3+ ions (0.1, 0.5, 1.0 and 2.0 mol%) were synthesized by the conventional melt quenching method. The prepared glasses were characterized through X-ray diffraction (XRD), optical absorption and photoluminescence spectra. The glassy nature of LBS host glass has been confirmed from XRD analysis and the Judd–Ofelt (JO) intensity parameters ( Ω λ , λ  = 2, 4 and 6) have been calculated from the intensities absorption bands. The evaluated parameters are then used to calculate radiative properties such as radiative transition probabilities ( A R ), total transition probability ( A T ), radiative lifetime ( τ R ) and branching ratios ( β R ) for the excited 4 F 9/2 level of Dy 3+ ions. From the emission spectra, the effective band widths (Δ λ eff ), stimulated emission cross-sections ( σ ( λ p )), yellow to blue (Y/B) intensity ratios, experimental lifetimes ( τ exp ) of 4 F 9/2 metastable state and the chromaticity color coordinates for white light emission have been determined and discussed.