Color-tunable properties based on complex anion substitution in Eu2+ doped Ca8Sc2(PO4)6-y(SiO4)1+y phosphor |
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Authors: | Fengping Ruan Degang Deng Hua Yu Ming Wu Bowen Chen Shiqing Xu Ruoshan Lei |
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Affiliation: | 1. College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China;2. College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China |
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Abstract: | We synthesized and investigated the effect of Eu2+ ions doping in a novel phosphor-silicate Ca8Sc2(PO4)6(SiO4) phosphor. The structure and photoluminescence properties were determined by X-ray powder diffraction Rietveld refinement, diffuse reflection spectra, emission-excitation spectra, decay curves and temperature dependence spectra. The phosphors showed an asymmetric broad-band blue emission (Eu2+) with peak at 470?nm. Furthermore, we presented the Ca7.96Sc2(PO4)6-y(SiO4)1+y:0.04Eu2+ phosphors by co-substituting [Eu2+-Si4+] for [Ca2+-P5+], and different behaviors of luminescence evolution in response to structural variation were verified among the series of phosphors. The results were attributed to the presence of multi Ca2+ sites, resulting in the mixing of blue and green emissions for Eu2+ ions. The complex anion substitution of [PO4]3- by [SiO4]4- induced an increased crystal field splitting of the Eu2+ ions, which caused a decrease in emission energy from the 5d excited state to the 4f ground state and a resultant red-shift from 470?nm to 520?nm. All the properties indicated that the Ca8Sc2(PO4)6(SiO4):Eu2+ phosphors have potential application for color-tunable WLEDs. |
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Keywords: | Color-tunable Phosphor Co-substitution |
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