Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7886288 | Ceramics International | 2018 | 32 Pages |
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 470â¯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 470â¯nm to 520â¯nm. All the properties indicated that the Ca8Sc2(PO4)6(SiO4):Eu2+ phosphors have potential application for color-tunable WLEDs.
Keywords
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Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Fengping Ruan, Degang Deng, Hua Yu, Ming Wu, Bowen Chen, Shiqing Xu, Ruoshan Lei,