Synthesis and photoluminescence of Ca–(Sn,Ti)–Si–O compounds
Synthesis and photoluminescence of Ca–(Sn,Ti)–Si–O compounds
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DOI：
10.1016/j.materresbull.2010.01.001
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发表时间：
2010-04
影响因子：
5.4
通讯作者：
S. Abe;H. Yamane;H. Yoshida
中科院分区：
文献类型：
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作者：
S. Abe;H. Yamane;H. Yoshida
研究了在 1673K 下的 CaO-SnO2-SiO2 体系和在 1573K 下的 CaO-TiO2-SiO2 体系中制备的化合物的相关系，以探索新型 Ti4+ 激活的锡酸盐荧光粉。分别在x=0~1.0和y=0~0.10处合成了Ca(Sn1−xTix)SiO5和Ca3(Sn1−yTiy)Si2O9固溶体，并通过粉末X射线衍射分析了它们的晶体结构。在紫外 (UV) 光激发下，在广泛的可见光波长范围内观察到这些固溶体的光致发光。 Ca(Sn0.97Ti0.03)SiO5和Ca3(Sn0.925Ti0.075)Si2O9的发射带峰分别在252nm激发下位于510nm和在258nm激发下位于534nm。通过漫反射光谱估计，CaSnSiO5 的吸收边为 300nm (4.1eV)，Ca3SnSi2O9 的吸收边为 270nm (4.6eV)，这表明 Ca(Sn1−xTix)SiO5 中的激发能级高于主体的带隙，尽管 Ca3(Sn1−yTiy)Si2O9 中的能级位于带隙内且靠近导带边缘。
The phase relation of the compounds prepared in the CaO–SnO2–SiO2system at 1673K and in the CaO–TiO2–SiO2system at 1573K was investigated in order to explore new Ti4+-activated stannate phosphors. Solid solutions of Ca(Sn1−xTix)SiO5and Ca3(Sn1−yTiy)Si2O9were synthesized at x=0–1.0 and y=0–0.10, respectively, and their crystal structures were analyzed by powder X-ray diffraction. Photoluminescence of these solid solutions was observed in a broad range of a visible light wavelength region under ultraviolet (UV) light excitation. The peaks of the emission band of Ca(Sn0.97Ti0.03)SiO5and Ca3(Sn0.925Ti0.075)Si2O9were at 510nm under excitation of 252nm and at 534nm under excitation of 258nm, respectively. The absorption edges estimated by the diffuse reflectance spectra were at 300nm (4.1eV) for CaSnSiO5and at 270nm (4.6eV) for Ca3SnSi2O9, suggesting that the excitation levels in Ca(Sn1−xTix)SiO5were above the band gap of the host, although the levels in Ca3(Sn1−yTiy)Si2O9were within the band gap and near the conduction band edge.