Journal
CERAMICS INTERNATIONAL
Volume 41, Issue 8, Pages 9610-9614Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2015.04.023
Keywords
Phosphors; Luminescence; Ca8MgLu(PO4)(7):Eu3+
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Funding
- Research Fund for the Doctoral Program of Higher Education of China (RFDP) [20130171130001]
- Government of Guangdong Province for Industrial Applications of Rare Earth Photoluminescence Materials [2012B091000026]
- Natural Science Foundation of Huizhou university [hzuxl 201301]
- National Natural Science Foundation of China
- National Natural Science Foundation of Guangdong Province [U1301242]
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A novel red-emitting phosphor Ca8MgLu(PO4)(7):Eu3+ was synthesized by a high-temperature solid-state reaction method. Its crystal structure, photoluminescence emission and excitation spectra, and decay time were investigated in detail. X-ray diffraction (XRD) results indicate that Ca8MgLu(PO4)(7) crystallizes in single-phase component with a whitlockite-like structure and the space group R3c of beta-Ca-3(PO4)(2). The emission spectrum shows a dominant peak at 612 nm due to the dipole D-5(0)-> F-7(2) transition of Eu3+, and the luminescence intensity keeps increasing with increasing the content of Eu3+ to 100%. The excitation spectrum is coupled well with the emission of near ultraviolet (NUV) LED (380-410 nm). The CIE coordinates of Ca8MgLu(PO4)(7):Eu3+ phosphor is (0.654, 0.346), being close to the standard value of National Television Standard Committee (NTSC) for red phosphor, (0.670, 0.330). The internal quantum efficiency of the phosphor is 69% under the excitation of 394 nm. The results show that Ca8MgLu(PO4)(7):Eu3+ is a very appropriate red-emitting phosphor with a high ratio of red and orange for NUV-based white LEDs. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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