Investigation of luminescence properties of Dy3+ doped LiF–Na2O– K2O–B2O3 glasses for white light generation

In this work Dy2O3 doped tri-alkali oxyfluoro-borate (NKLB-Dy) glasses were prepared by melt quenching technique for white light applications. The important optical and physical properties of the studied NKLB-Dy glasses were determined. Judd-Ofelt (JO) parameters (Ωλ, λ = 2, 4, 6) were calculated fo...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-10, Vol.805, p.896-903
Main Authors: Khan, I., Shoaib, M., Rooh, G., Kaewkhao, J., Khattak, S.A., Ahmad, T., Zaman, F., Ataullah, Tufail, M.
Format: Article
Language:English
Subjects:
Alkali
Boron oxides
CIE chromaticity
Cross relaxation
Decay rate
Dysprosium
Emission analysis
Emission spectra
Energy transfer
JO-Paramters
Lithium fluoride
Luminescence
Mathematical analysis
Optical properties
Oxygen packing density
Parameters
Photonics
Physical properties
Radiative lifetime
Rare earth
Refractivity
White light
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Summary:In this work Dy2O3 doped tri-alkali oxyfluoro-borate (NKLB-Dy) glasses were prepared by melt quenching technique for white light applications. The important optical and physical properties of the studied NKLB-Dy glasses were determined. Judd-Ofelt (JO) parameters (Ωλ, λ = 2, 4, 6) were calculated for prepared glasses using the JO-theory. The radiative properties of the glasses were investigated using JO-parameter (Ωλ), refractive index (n) and emission spectra for all concentration of Dy2O3 in NKLB glasses. Moreover higher value of Ω2 and yellow to Blue (Y/B) ratio for title NKLB-Dy glasses confirm higher degree of covalency of Dy–O bonding. The CIE color coordinates for various concentrations fall in white region and CCT value for present NKLB-Dy glasses are more than warm (CCT = 4687K) The experimental lifetime decreases with increasing Dy2O3concentration. The non radiative energy transfer through resonance transfer (RET) and cross relaxation are the predominant causes of non-exponential behavior of the lifetime. The non-radiative decay rate (Wnr) has negative value for all NKLB-Dy glasses due to higher experimental lifetime than radiative lifetime. All these results suggest the potential use of studied NKLB-Dy glasses in various photonic devices application such as white light generation. •NKLB glasses were synthesized by traditional melt quenching method.•J-O (Ωλ) parameters and lasing properties were analyzed.•All samples emit white light under 575 nm excitation.•The CCT values obtained from CIE for these glass samples shows 4687 K.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2019.07.123