Investigation of luminescence and laser transition of Dy3+ ion in P2O5[sbnd]PbO[sbnd]Bi2O3[sbnd]R2O3 (R = Al, Ga, In) glasses.

P 2 O 5 PbO Bi 2 O 3 R 2 O 3 (R = Al, Ga, In) glasses doped with Dy 2 O 3 were prepared by melt quenching technique. The prepared glasses were characterized by XRD, optical absorption, FTIR, luminescence studies. Judd-Ofelt parameters have been evaluated for three glass systems from optical absorption spectra and in turn radiative parameters for excited luminescent levels of Dy 3+ ion are also calculated. Emission cross section and branching ratio values are observed to high for 6 H 13/2 level for Dy 3+ ion. The yellow to blue intensity ratios and CIE chromaticity coordinates were calculated. Decay curves exhibit non exponential behavior. Quantum efficiency of prepared glasses was measured by using radiative and calculated life times. IR studies, J-O parameters and Y/B ratio values indicate that more asymmetry around Dy 3+ ions in Ga 2 O 3 mixed glass was observed. Chromaticity coordinates lie near ideal white light region. These coordinates and CCT values have revealed that all the prepared glasses emit quality white light especially the glasses mixed with Ga 2 O 3 are suitable for development of white LEDs. [ABSTRACT FROM AUTHOR]