Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 170, Issue -, Pages 206-213Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2016.06.054
Keywords
KY(1-x)DyxBO3 phosphor; Solid-state reaction; Luminescent properties; Chromaticity; White light emission
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Funding
- University Grants Commission, New Delhi [F.15-1/2011-12/PDFWM-2011-12-OB-AND-9964 (SA-II)]
- CSIR, New Delhi, India [03(1224)/12/EMR-II]
- Department of Science and Technology, Govt. of India [DST-INT-Spain-P-38-11]
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Yttrium borate phosphors KY(1-x)DyxBO3) doped with Dy3+ ions were synthesized by the solid-state reaction method. The structural and morphological characteristics were studied by XRD, FTIR and SEM measurements. Luminescent properties of different concentrations of KY(1-x)DyxBO3 phosphors were investigated from the excitation, emission and decay analyses. The emission spectra exhibited characteristic blue (460-500 nm) and yellow (555-610 nm) bands of Dy3+ ions which combines to give white light. The evaluated color co-ordinates (x, y) were found to lie within the white light region of CIE chromaticity diagram. All the decay curves of Dy3+ ions exhibited non-exponential nature and the experimental lifetimes for the F-4(9/2) excited level were found to decrease from 0.87, 0.47, 0.35, 0.26 and 0.13 ms with the increase of Dy3+ ion concentrations from 0.05, 0.1, 0.15, 0.2 and 0.3 mol%, respectively. In order to understand the energy transfer mechanism, the decay curves were fitted to Inokutti-Hirayama model and found that the energy transfer is of dipole-dipole type. From the results of these investigations, it is concluded that the KY(1-x)DyxBO3 phosphors are more useful for white light emitting diodes. (C) 2016 Elsevier B.V. All rights reserved.
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