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Color-tunable properties based on complex anion substitution in Eu 2+ doped Ca 8 Sc 2 (PO 4 ) 6-y (SiO 4 ) 1+y phosphor
Ceramics International ( IF 5.2 ) Pub Date : 2018-09-01 , DOI: 10.1016/j.ceramint.2018.05.197 Fengping Ruan , Degang Deng , Hua Yu , Ming Wu , Bowen Chen , Shiqing Xu , Ruoshan Lei
Ceramics International ( IF 5.2 ) Pub Date : 2018-09-01 , DOI: 10.1016/j.ceramint.2018.05.197 Fengping Ruan , Degang Deng , Hua Yu , Ming Wu , Bowen Chen , Shiqing Xu , Ruoshan Lei
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.
中文翻译:
基于 Eu 2+ 掺杂 Ca 8 Sc 2 (PO 4 ) 6-y (SiO 4 ) 1+y 磷光体中复合阴离子取代的颜色可调特性
摘要 我们合成并研究了 Eu2+ 离子掺杂对新型磷硅酸盐 Ca8Sc2(PO4)6(SiO4) 荧光粉的影响。通过 X 射线粉末衍射 Rietveld 精修、漫反射光谱、发射-激发光谱、衰减曲线和温度依赖性光谱确定结构和光致发光特性。荧光粉显示不对称宽带蓝色发射 (Eu2+),峰值在 470 nm。此外,我们通过用 [Eu2+-Si4+] 代替 [Ca2+-P5+] 来呈现 Ca7.96Sc2(PO4)6-y(SiO4)1+y:0.04Eu2+ 荧光粉,以及响应结构的不同发光演化行为。验证了荧光粉系列之间的差异。结果归因于多个 Ca2+ 位点的存在,导致 Eu2+ 离子的蓝色和绿色发射混合。[PO4]3- 被 [SiO4]4- 的复合阴离子取代导致 Eu2+ 离子的晶体场分裂增加,这导致发射能量从 5d 激发态到 4f 基态的降低和由此产生的红移从 470 纳米到 520 纳米。所有特性表明 Ca8Sc2(PO4)6(SiO4):Eu2+ 荧光粉在颜色可调 WLED 中具有潜在的应用。
更新日期:2018-09-01
中文翻译:
基于 Eu 2+ 掺杂 Ca 8 Sc 2 (PO 4 ) 6-y (SiO 4 ) 1+y 磷光体中复合阴离子取代的颜色可调特性
摘要 我们合成并研究了 Eu2+ 离子掺杂对新型磷硅酸盐 Ca8Sc2(PO4)6(SiO4) 荧光粉的影响。通过 X 射线粉末衍射 Rietveld 精修、漫反射光谱、发射-激发光谱、衰减曲线和温度依赖性光谱确定结构和光致发光特性。荧光粉显示不对称宽带蓝色发射 (Eu2+),峰值在 470 nm。此外,我们通过用 [Eu2+-Si4+] 代替 [Ca2+-P5+] 来呈现 Ca7.96Sc2(PO4)6-y(SiO4)1+y:0.04Eu2+ 荧光粉,以及响应结构的不同发光演化行为。验证了荧光粉系列之间的差异。结果归因于多个 Ca2+ 位点的存在,导致 Eu2+ 离子的蓝色和绿色发射混合。[PO4]3- 被 [SiO4]4- 的复合阴离子取代导致 Eu2+ 离子的晶体场分裂增加,这导致发射能量从 5d 激发态到 4f 基态的降低和由此产生的红移从 470 纳米到 520 纳米。所有特性表明 Ca8Sc2(PO4)6(SiO4):Eu2+ 荧光粉在颜色可调 WLED 中具有潜在的应用。