Photoluminescence Properties of Dy3+ Ion-Doped Li2O-PbO-Gd2O3-SiO2 Glasses for White Light Application
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Dy2O3-doped lithium lead gadolinium silicate glass was prepared for physical, optical, structural, X-ray induced luminescence and PL-luminescence properties for various potential applications in solid state lighting applications. JO parameters were estimated using JO theory. For the developed samples using emission spectra, CIE color coordinates and yellow/blue ratio are measured for white light emission. The transition 4F9/2 → 6H13/2 has higher value of stimulated emission cross section and radiative transition probability for all concentration showing its potential for laser emission. This transition has calculated and experimental branching ratio (βR) more than 0.50. The CCT value for developed glass samples is 4264 K which is more than warm CCT (CCT > 4000 K). The allowed indirect (n = 2) and direct (n = 1/2) band gaps were determined and found to be decreasing with increasing Dy2O3 concentration. The lifetime non-exponential nature is fitted well to IH model for S = 6. The energy transfer parameter (Q) increases and experimental lifetime decreases for concentration increase of Dy3+ ions in LPDy glasses. The investigation shows the potential of LPDy glasses for the laser and white light generation application.
KeywordsLead oxide Dysprosium Rare earth CIE chromaticity Silicate glasses
The author (I. Khan) is thankful to his advisers, Professor Dr. Gul Rooh, Dr. J. Kaewkhao, Y. Ruangtaweep and Dr. N. Srisittipokakun in Thailand for their guidance and help. In addition, author would like to thank National Research Council of Thailand (NRCT) and Nakhon Pathom Rajabhat University (NPRU) for supporting our research.
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