Journal
OPTICAL MATERIALS
Volume 69, Issue -, Pages 87-95Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2017.04.001
Keywords
Dy3+ ion; Niobium phosphate glasses; Judd-Ofelt analysis; Fluorescence properties; White light
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Funding
- DAE-BRNS, Mumbai, Government of India [2009/34/36/BRNS/3174]
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Niobium phosphate glasses (P2O3+Nb2O5+K2O + Al2O3+Dy2O3) doped with different concentrations of Dy3+ ions have been synthesized by melt quenching technique and characterized through structural and optical measurements to evaluate the fluorescence properties and find their suitability for white light emitting diodes (LEDs). Phonon energy and vibrational groups of the host matrix have been analyzed from Raman spectra. Judd-Ofelt analysis has been applied for 1.0 mol% Dy2O3-doped glass and inturn radiative properties have been evaluated for excited states of the Dy3+ ion. The higher value of stimulated emission cross-section (sigma(e) = 6.4 x 10(-21) cm(2)) for the F-4(9/2) -> H-6(13/2) level confirms its potentiality to be used as yellow laser. The decay curves exhibit non-exponential nature at higher concentrations (>= 1 mol %) of Dy3+ ion. From the decay curve analysis, the quantum efficiency for the F-4(9/2) level of 1.0 mol % Dy3+-doped glass is found to be 92%. The yellow to blue intensity ratios and chromaticity color co-ordinates are found to vary with Dy3+ ion concentrations excitation wavelengths and are within the white light region. (C) 2017 Elsevier B.V. All rights reserved.
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