NDLI: Sr3Ce(PO4)3:Eu2+: a broadband yellow-emitting phosphor for near ultraviolet-pumped white light-emitting devices

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Journal of Materials Chemistry C Vol - 4 Issue - 5

Journal of Materials Chemistry C Vol -3

Journal of Materials Chemistry C Vol -2

Journal of Materials Chemistry C Vol -1

Sr₃Ce(PO₄)₃:Eu²⁺: a broadband yellow-emitting phosphor for near ultraviolet-pumped white light-emitting devices

Content Provider	Royal Society of Chemistry (RSC)
Author	Chen, Teng-Ming Chan, Ting-Shan Lee, Szu-Ping Chiang, Yun-Wei Dai, Pengpeng Huang, Chien-Hao
Copyright Year	2016
Abstract	We have synthesized and investigated a series of yellow-emitting Sr3Ce(PO4)3:Eu2+ phosphors, showing an extreme broadband at around 535 nm (with a FWHM of ca. 200 nm/6760 cm−1) and a large Stoke shift (ca. 8265 cm−1), which is attributed to the 4f–5d transition of Eu2+ without the contribution from Ce3+ emission under excitation at long wavelengths (>370 nm). However, such broadband Eu2+ emission is rather surprising, considering that there is only one cation site for the Eu2+ luminescent center. Herein, we investigated the crystal structure by performing X-ray Rietveld refinement on the synchrotron X-ray diffraction data, and demonstrate that both cation and anion sites in Sr3Ce(PO4)3 are disordered in the host lattice. These unusual structural characters generate a variety of distinct Eu2+ sites, which is verified by decay lifetime analysis and electron paramagnetic resonance spectra, and thus result in astonishing broadband yellow-emission. Moreover, a white LED device with a color-rendering index of 86.5, a color temperature of 5996 K, and chromaticity coordinates of (0.32, 0.38) was obtained by combining a 405 nm near-UV LED chip and the phosphor blends of yellow-emitting Sr3Ce(PO4)3:Eu2+ and the commercial blue-emitting BaMgA10O17:Eu2+ phosphor. These results indicate that the as-prepared yellow-emitting Sr3Ce(PO4)3:Eu2+ phosphor has potential applications in the dual-color-phosphor-converted WLEDs.
Starting Page	1170
Ending Page	1177
Page Count	8
File Format	HTM / HTML PDF
ISSN	20507526
Volume Number	4
Issue Number	6
Journal	Journal of Materials Chemistry C
DOI	10.1039/c5tc02582f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Rietveld Full width at half maximum Stoke City F.C. Ion X-ray crystallography Rietveld refinement Synchrotron radiation Crystal structure Electron paramagnetic resonance Color temperature Chromaticity
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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