| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5400438 | Journal of Luminescence | 2013 | 5 Pages |
Abstract
The yellow-emitting Ca10Na(PO4)7:Eu2+ phosphors were synthesized by conventional high-temperature solid-state reaction method. The phosphors were well characterized by powder X-ray diffraction, FT-IR spectra and diffuse reflectance spectra. DFT calculation results showed that Ca10Na(PO4)7 had an indirect bandgap with a bandgap energy of about 3.82Â eV. Ca10Na(PO4)7:Eu2+ showed a yellow emission band peaking at 550Â nm under 350Â nm excitation. The broad emission bandwidth (about 138Â nm) of Ca10Na(PO4)7:Eu2+ is favorable for white LEDs conversion phosphors. The optimal doping concentration of Eu2+ ions in Ca10Na(PO4)7:Eu2+ phosphor was about 8Â mol%. This study demonstrated that the energy transfer among the nearest-neighbor ions was the main mechanism of concentration quenching of Ca10Na(PO4)7:Eu2+ phosphor. These results indicate that Ca10Na(PO4)7:Eu2+ may be potentially useful as a UV radiation-converting phosphor for white LEDs.
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Authors
Hua Yu, Degang Deng, Yinqun Li, Shiqing Xu, Yinyan Li, Cuiping Yu, Yanyan Ding, Hongwei Lu, Haoyong Yin, Qiulin Nie,