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Energy Transfer and Spectroscopic Investigation of Dy2O3 Doped Li2O–BaO–GdF3–SiO2 for White Light LED

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Abstract

LGFDy glasses doped with Dy2O3 (0.1, 0.5, 1.0, 1.5 and 2.0 mol %) were synthesised by conventional melt quenching method and various properties are studied by absorption, Judd–Ofelt analysis, photoluminescence, X-ray excited luminescence, decay curve and CIE color chromaticity measurement. Judd-Ofelt parameters (Ω2, Ω4 and Ω6) are valuated form JO theory in order to estimate the radiative parameters of the Dy3+ ion excited states. For white light emission, Yellow/Blue (Y/B) ratio and CIE color coordinates for glasses under study are measured from the emission spectra. The energy transfer from Gd3+ to Dy3+ ions has been studied by exciting the glass with 275 nm photon. The higher value of σ (λp) and βR for 4F9/2 → 6H13/2 transition indicates its more potential use in laser application in yellow region. The correlated color temperature for LGFDy glasses is found to be 4264 K. The decay profile of fluorescent level 4F9/2 for different concentration of Dy3+ ions in the present glasses changes to non-exponential from single-exponential for higher concentration (≥0.5 mol %) of Dy3+ ions. Thus the chemical composition of glass and dopant (Dy3+ ions) concentration strongly influence the energy transfer mechanism. The lifetime non-exponential behavior is well fitted to IH-model for S = 6. The quantum efficiency for LBGFDy05 glass is found to be 86%. The systematic investigation signifies the potential of the studied LGFDy glasses for the laser and white light generation application.

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ACKNOWLEDGMENTS

The author (I. Khan) shows his gratitude to his Prof. Dr. Gul Rooh (Advisor) in Pakistan, Prof. Dr. J. Kaewkhao (Advisor) and Dr. N. Sirsittipokakun (Co-advisor) in Thailand for their help and guidance.

Funding

In addition Dr. J. Kaewkhao would like to pays his gratitude to Nakhon Pathom Rajabhat University (N.P.R.U) and National Research Council of Thailand for supporting our research (funding project number GB63). Further author R. Rajaramakrishna (R.R.K) thank to Nakhon Pathom Rajabhat university Thailand for funding this research project (funding project number PD1_2017).

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Authors and Affiliations

  1. Department of Physics, Faculty of Science, Abdul Wali Khan University, 23200, Mardan, Pakistan

    I. Khan & G. Rooh

  2. Physics program,Faculty of Science and Technology, Nakhon Pathom Rajabhat University, 73000, Nakhon Pathom, Thailand

    N. Srisittipokakun & J. Kaewkhao

  3. Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, 73000, Nakhon Pathom, Thailand

    R. Rajaramakrishna, N. Srisittipokakun & J. Kaewkhao

  4. Department of Physics, Kyungpook National University, 702-701, Deagu, Korea

    H. J. Kim

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  1. I. Khan
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  2. G. Rooh
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  3. R. Rajaramakrishna
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  4. N. Srisittipokakun
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Correspondence to J. Kaewkhao.

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Khan, I., Rooh, G., Rajaramakrishna, R. et al. Energy Transfer and Spectroscopic Investigation of Dy2O3 Doped Li2O–BaO–GdF3–SiO2 for White Light LED. Glass Phys Chem 45, 332–343 (2019). https://doi.org/10.1134/S1087659619050067

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