X-ray analysis and optical studies of Dy3+ doped NaSrB5O9 microstructures for white light generation

Title
X-ray analysis and optical studies of Dy3+ doped NaSrB5O9 microstructures for white light generation
Author(s)
주상우B. Ramesh[B. Ramesh]C. Madhukar Reddy[C. Madhukar Reddy]K. Mallikarjuna[K. Mallikarjuna]O. Ravi[O. Ravi]S.J. Dhoble[ S.J. Dhoble]B. Deva Prasad Raju[B. Deva Prasad Raju]고라라구파띠딜립
Keywords
SOLID-STATE; LUMINESCENCE PROPERTIES; EMITTING-DIODES; ENERGY-TRANSFER; CRYSTAL-STRUCTURE; PHOSPHORS; EMISSION; TB3+; NANOPARTICLES; NANOPHOSPHOR
Issue Date
201412
Publisher
ELSEVIER SCIENCE SA
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.615, pp.719 - 727
Abstract
A white light emitting phosphor NaSrB5O9:Dy3+ was synthesized by a conventional solid state reaction method. The structure of the phosphors was analyzed by powder X-ray diffraction (XRD), revealing that the phosphors crystallized in monoclinic crystal structure with the space group (P2(1)/c). Williamson-Hall (W-H) analysis was used to study the individual contributions of crystallite sizes and lattice strain on the peak broadening of NaSrB5O9:Dy3+ phosphors. Monoclinic microstructures of nearly plate-like morphologies were observed in the FE-SEM images. Upon near-UV excitation wavelength (390 nm), the blue emission at similar to 482 nm (H-6(15/2)) and yellow emission at similar to 584 nm (H-6(13/2)) were observed in the phosphors. The critical quenching concentration of Dy3+ in NaSrB5O9 phosphor was found to be 3 at.% with the critical distance (R-c) of similar to 22.30 angstrom and the corresponding concentration quenching mechanism was testified to be the exchange interaction between the dopant Dy3+ ions. In order to investigate the application in white LEDs, the Commission International de l'Eclairage (CIE) chromaticity coordinates, color temperature and decay curve measurements of Dy3+ ions doped NaSrB5O9 phosphors were carried out. The yellow to blue (Y/B) emission integrated intensity ratio is maximum (similar to 0.9) for all the concentrations, suggesting that the phosphors favor for white illumination. (C) 2014 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/30301http://dx.doi.org/10.1016/j.jallcom.2014.07.017
ISSN
0925-8388
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공과대학 > 기계공학부 > Articles
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