Journal
OPTICS AND LASER TECHNOLOGY
Volume 106, Issue -, Pages 29-33Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2018.03.023
Keywords
Optical materials; Chemical synthesis; Luminescence; Optical properties; Phosphors
Categories
Funding
- Natural Science Foundation of China [11104234]
- Fujian Provincial Natural Science Foundation of China [2016J01684]
- SRF for ROCS, SEM
- Science Technology innovation project of Xiamen [3502Z20173040]
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White-light-emitting phosphors Dy3+-doped CaLaB7O13 were synthesized by solid-state reaction, and their luminescent properties were characterized for the applications in white-light-diodes (W-LEDs). The obtained samples were initially investigated by X-ray powder diffraction, photoluminescence excitation and emission spectra, the Commission International de L'Eclairage (CIE) chromaticity coordinates, and thermally stable properties. Dy3+-doped CaLaB7O13 phosphors emitted a blue emission band centered at 480 nm and a yellow one centered at 575 nm with CIE chromaticity coordinates of (0.325, 0.339) under the excitation of near-UV (NUV) LED chips at 365 nm. The electric dipole-dipole interaction was demonstrated to be the energy transfer mechanism in Dy3+-doped CaLaB7O13 phosphors, and the critical distance of energy transfer between the Dy3+ ions was estimated to be about 0.920 nm. The temperature-dependent spectra imply Dy3+-doped CaLaB7O13 show small thermal quenching. The present work indicated that Dy3+-doped CaLaB(7)O(13)3 was a promising white-light-emitting phosphor excited by NUV LED. (C) 2018 Elsevier Ltd. All rights reserved.
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