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HERO ID
5088807
Reference Type
Journal Article
Title
New yellow-emitting Whitlockite-type structure Sr(1.75)Ca(1.25)(PO4)2:Eu(2+) phosphor for near-UV pumped white light-emitting devices
Author(s)
Ji, H; Huang, Z; Xia, Z; Molokeev, MS; Atuchin, VV; Fang, M; Huang, S
Year
2014
Is Peer Reviewed?
Yes
Journal
Inorganic Chemistry
ISSN:
0020-1669
EISSN:
1520-510X
Volume
53
Issue
10
Page Numbers
5129-5135
Language
English
PMID
24773050
DOI
10.1021/ic500230v
Web of Science Id
WOS:000336240400040
Abstract
New compound discovery is of interest in the field of inorganic solid-state chemistry. In this work, a whitlockite-type structure Sr1.75Ca1.25(PO4)2 newly found by composition design in the Sr3(PO4)2-Ca3(PO4)2 join was reported. Crystal structure and luminescence properties of Sr1.75Ca1.25(PO4)2:Eu(2+) were investigated, and the yellow-emitting phosphor was further employed in fabricating near-ultraviolet-pumped white light-emitting diodes (w-LEDs). The structure and crystallographic site occupancy of Eu(2+) in the host were identified via X-ray powder diffraction refinement using Rietveld method. The Sr1.75Ca1.25(PO4)2:Eu(2+) phosphors absorb in the UV-vis spectral region of 250-430 nm and exhibit an intense asymmetric broadband emission peaking at 518 nm under λex = 365 nm which is ascribed to the 5d-4f allowed transition of Eu(2+). The luminescence properties and mechanism are also investigated as a function of Eu(2+) concentration. A white LED device which is obtained by combining a 370 nm UV chip with commercial blue phosphor and the present yellow phosphor has been fabricated and exhibit good application properties.
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