Intense white light luminescent Dy3+ doped lithium borate glasses for W-LED: A correlation between physical, thermal, structural and optical properties
Abstract In this article the physical, thermal structural and optical properties of Dy 3+ doped lithium borate glasses have been studied for white LED application. The emission spectra shows two intense emission bands at around 483 nm and 574 nm corresponds to the 4 F 9/2 → 6 H 15/2 and 4 F 9/2 → 6 H 13/2 transitions along with one feeble band at 663 nm corresponds to 4 F 9/2 → 6 H 11/2 transition. The average lifetime of Dy 3+ were found to be about 2.95 and 4.94 ns for blue and yellow emission bands respectively. CIE chromaticity diagram shows glass LBD-4 containing 0.5 mol% Dy 2 O 3 with colour co-ordinates x = 0.33 and y = 0.37 have highest emission intensity. These glasses having emission in the white region and thus can be used for bright white LED's and modern white LED bulbs. Highlights Lithium borate glasses doped with Dy 3+ were prepared by melt quench technique. Structural, thermal and optical properties of LBD glasses were studied. Intense emission peaks at 483, 574 nm and one feeble band is observed at 663 nm. Direct and indirect energy band gaps were determined by means of Tauc's plot. CIE chromaticity diagram shows emission in white region. Graphical abstract [DISPLAY OMISSION]
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- DOI : http://dx.doi.org/10.1016/j.solidstatesciences.2016.12.009
- Elsevier : 저널> 권호 > 논문
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