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洛阳理工学院 数理部,河南 洛阳,471023
纸质出版日期:2015-8-3,
收稿日期:2015-3-11,
修回日期:2015-6-30,
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刘利娜, 张东梅, 张永胜等. YVO<sub>4</sub>:Eu<sup>3+</sup>@SiO<sub>2</sub>核壳结构纳米复合材料的合成与表征[J]. 发光学报, 2015,36(8): 882-887
LIU Li-na, ZHANG Dong-mei, ZHANG Yong-sheng etc. Synthesis and Characterization of Core-shell Structured YVO<sub>4</sub> :Eu<sup>3+</sup>@SiO<sub>2</sub> Nanocomposites[J]. Chinese Journal of Luminescence, 2015,36(8): 882-887
刘利娜, 张东梅, 张永胜等. YVO<sub>4</sub>:Eu<sup>3+</sup>@SiO<sub>2</sub>核壳结构纳米复合材料的合成与表征[J]. 发光学报, 2015,36(8): 882-887 DOI: 10.3788/fgxb20153608.0882.
LIU Li-na, ZHANG Dong-mei, ZHANG Yong-sheng etc. Synthesis and Characterization of Core-shell Structured YVO<sub>4</sub> :Eu<sup>3+</sup>@SiO<sub>2</sub> Nanocomposites[J]. Chinese Journal of Luminescence, 2015,36(8): 882-887 DOI: 10.3788/fgxb20153608.0882.
用沉淀法制备了尺寸约为8 nm的YVO
4
:Eu
3+
纳米粒子
然后用反相微乳液法在YVO
4
:Eu
3+
纳米粒子的表面包覆了一层SiO
2
壳. 利用XRD、TEM、UV-Vis吸收光谱和光致发光光谱对合成的样品进行了表征.得到的复合物具有较好的核壳结构
通过改变硅酸四乙酯的用量可以改变SiO
2
壳的厚度.研究了SiO
2
壳对YVO
4
:Eu
3+
发光性质的影响
结果表明:包覆和未包覆的样品在紫外光激发下都有Eu
3+
的特征发射;随着SiO
2
壳厚度的增加
发光强度和量子效率越来越低
Eu
3+
格位对称性越来越高.
YVO
4
:Eu
3+
nanoparticles of about 8 nm were synthesized by precipitation reactions and coated with SiO
2
by a reverse microemulsion method. Powder X-ray diffraction (XRD) patterns indicate that these nanoparticles are purely tetragonal phase. Transmission electron microscope (TEM) images show that YVO
4
:Eu
3+
nanoparticles are successfully coated with silica to form core-shell structured nanocomposites. The thicknesses of SiO
2
shells can be altered by changing the volume of tetraethoxysilane (TEOS) used in the reaction. The ultraviolet-visible (UV-Vis) absorption spectra of YVO
4
:Eu
3+
@SiO
2
nanocomposites agree well with that of the YVO
4
:Eu
3+
nanoparticles colloid. Both the excitation and emission spectra are the same for YVO
4
:Eu
3+
nanoparticles and the nanocomposites. With the increasing of the thickness of SiO
2
shell
the intensity ratio of
5
D
0
-
7
F
2
/
5
D
0
-
7
F
1
decreases
indicating that SiO
2
shells can increase the local symmetry of Eu
3+
. All samples can emit bright red light under ultraviolet irradiation. The photoluminescence quantum yield decreases after SiO
2
coating. With the increasing of the thickness of SiO
2
shell
the photoluminescence quantum yield becomes lower and lower.
YVO4 :Eu3+SiO2微乳液核壳发光
YVO4:Eu3+SiO2microemulsioncore-shellluminescence
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