Luminescent studies of Dy 3+ ion in alkali lead tellurofluoroborate glasses

Journal of Quantitative Spectroscopy and Radiative Transfer (Impact Factor: 2.29). 01/2011; 112(1):78-84. DOI: 10.1016/j.jqsrt.2010.08.017

ABSTRACT Dy3+-doped alkali lead tellurofluoroborate (RLTB) glasses (R=Li, Na and K) were prepared by melt quenching technique. Judd–Ofelt theory has been used to evaluate the three intensity parameters Ω2, Ω4 and Ω6 from the experimental oscillator strengths. The photoluminescence spectra obtained by the excitation wavelength of 385nm show four emission bands at 454, 483, 575 and 665nm corresponding to the 4I15/2→6H15/2 and 4F9/2→6HJ/2 (J=15/2, 13/2 and 11/2) transitions, respectively. The laser characteristic parameters like fullwidth at half maxima (FWHM), stimulated emission cross-sections (σe), optical gain parameters (σe×τexp) and gain bandwidth parameters (σe×FWHM) were determined. From the visible emission spectra, yellow to blue (Y/B) intensity ratios and chromaticity coordinates were also estimated. The lifetimes of 4F9/2 metastable state were also measured and discussed.

  • [Show abstract] [Hide abstract]
    ABSTRACT: This article reports on the optical absorption and photoluminescence analysis of different concentrations of Dy3+ ions doped cadmium bismuth borate (CdBiB) glasses prepared by melt quenching method. The emission spectra of Dy3+: CdBiB glasses have shown a yellow emission at 574 nm (4F9/2 → 6H13/2). The emission intensity was maximum for 1.0 mol% of Dy3+: CdBiB glass and after this optimum concentration, the phenomenon of concentration quenching was observed. From the absorption spectrum, by applying the J-O theory, the experimental oscillator strengths were determined and have been used to calculate the J–O intensity parameters. By using the J–O intensity parameters various radiative properties such as branching ratios (βR), measured branching ratios (βm), spontaneous emission transition probability (A), radiative transition rate (AT), radiative life time (τR), measured life time (τm), effective band-width (Δλp) and stimulated emission cross sections have been calculated for the various transitions of Dy3+: CdBiB glasses. The nature of the luminescence decay curves is also reported.
    Ferroelectrics Letters Section 01/2013; 40. · 0.46 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: 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.
    Journal of Quantitative Spectroscopy and Radiative Transfer 03/2013; 118:40–48. · 2.29 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Intense greenish–yellow emission near the hemoglobin absorption peak at 577 nm was observed in Dy3 + doped sodium–magnesium–aluminum–phosphate (NMAP) glasses under UV excitation. The Judd–Ofelt intensity parameters and the integrated fluorescence intensity ratio between 4F9/2 → 6H13/2 (yellow) and 4F9/2 → 6H15/2 (blue) imply a strong asymmetrical and covalent environment around Dy3 + in the phosphate glasses. The fluorescence branching ratio and the stimulated emission cross-section of the 4F9/2 → 6H13/2 transition were identified to be 65.9% and 25.65 × 10− 22 cm2, respectively, confirming the efficiency of the visible fluorescence emission. Channel waveguide was fabricated successfully by K+–Na+ ion-exchange method with mode field diameter of 20.5 μm in the horizontal direction and 8.7 μm in the vertical direction. The results demonstrate that Dy3 + doped NMAP glasses are promising to develop waveguide light sources for thrombolysis.
    Journal of Non-Crystalline Solids 05/2014; 391:17–22. · 1.72 Impact Factor


Available from
May 28, 2014