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Issue 6, 2016
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Sr3Ce(PO4)3:Eu2+: a broadband yellow-emitting phosphor for near ultraviolet-pumped white light-emitting devices

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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.

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

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Supplementary files

Article information


Submitted
20 Aug 2015
Accepted
26 Dec 2015
First published
30 Dec 2015

J. Mater. Chem. C, 2016,4, 1170-1177
Article type
Paper
Author version available

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

P. Dai, S. Lee, T. Chan, C. Huang, Y. Chiang and T. Chen, J. Mater. Chem. C, 2016, 4, 1170
DOI: 10.1039/C5TC02582F

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