Investigation of luminescence and laser transition of Dy3+ ion in P2O5PbOBi2O3R2O3 (R = Al, Ga, In) glasses

• Published in: Optical materials Vol. 66; pp. 189 - 196
• Main Authors: Ram, G. Chinna, Narendrudu, T., Suresh, S., Kumar, A. Suneel, Rao, M.V. Sambasiva, Kumar, V. Ravi, Rao, D. Krishna
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.04.2017
• Subjects: Dy3+ ions; Lead bismuth phosphate glasses; Optical absorption; Photoluminescence; White LEDs; Dy3+ ions; Lead bismuth phosphate glasses; Photoluminescence; Optical absorption; White LEDs
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2017.02.004

P2O5PbOBi2O3R2O3 (R = Al, Ga, In) glasses doped with Dy2O3 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 Dy3+ ion are also calculated. Emission cross section and branching ratio values are observed to high for 6H13/2 level for Dy3+ 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 Dy3+ ions in Ga2O3 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 Ga2O3 are suitable for development of white LEDs. [Display omitted] •P2O5PbOBi2O3R2O3 (R = Al, Ga, In) glasses doped with Dy2O3 were prepared by melt quenching technique.•J-O parameters indicate that more covalent environment and disorder around the Dy3+ ion.•Branching ratio of yellow emission transition 4F9/2 to 6H13/2 is found to be high.•Relatively larger asymmetry is observed in Ga2O3 mixed glass than Al2O3 and In2O3 mixed glasses.•Color coordinates lie within the white light region and these glasses are suitable for W-LEDs.