ZnxGa2O3+x (0 ≤ x ≤ 1) solid solution nanocrystals: tunable composition and optical properties
ZnxGa2O3+x (0 ≤ x ≤ 1) solid solution nanocrystals: tunable composition and optical properties
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DOI：
10.1039/c1jm13091a
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发表时间：
2012
影响因子：
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通讯作者：
Yanping Yuan;W. Du;Xuefeng Qian
中科院分区：
文献类型：
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作者：
Yanping Yuan;W. Du;Xuefeng Qian
采用溶剂热法制备了均匀的ZnxGa2O3+x（0≤x≤1）固溶体纳米晶体，并用x射线粉末衍射（XRD）、x射线荧光光谱（XRF）、透射电子显微镜（TEM）、紫外可见光谱（UV-vis）和x射线光电子能谱（XPS）对其进行了表征。XRD谱图分析表明，ZnxGa2O3+x（0≤x≤1）固溶体纳米晶的晶格参数根据Vegard定律随ZnGa2O4比的增加而线性增加，证实了这些固溶体纳米晶的均质结构。紫外可见吸收光谱表明，通过精细控制锌的含量，所制得的ZnxGa2O3+x固溶体纳米晶体的带隙可以在4.43 ~ 3.70 eV范围内精确调谐。随着x值的增大，ZnxGa2O3+x固溶体纳米晶的发光逐渐增强并红移，ZnGa2O4纳米晶表现出强烈的蓝色发光。XPS结果表明，ZnxGa2O3+x的结合能随着x值的增加而增加，表明Oh位的氧空位（Vo*）减少，Ga-O八面体的对称性增加，导致ZnxGa2O3+x固溶体的发射红移。
Homogenous ZnxGa2O3+x (0 ≤ x ≤ 1) solid solution nanocrystals were successfully prepared by a solvothermal approach and characterized by X-ray powder diffraction (XRD), X-ray spectra in fluorescence (XRF), transmission electron microscopy (TEM), UV-vis spectroscopy, and X-ray photoelectron spectrum (XPS). XRD pattern analysis revealed that the lattice parameters of ZnxGa2O3+x (0 ≤ x ≤ 1) solid solution nanocrystals increased linearly with the increase of ZnGa2O4 ratio according to Vegard's law, which confirmed the homogenous structures of these solid solution nanocrystals. UV-vis absorption spectra demonstrated that the band gap of the obtained ZnxGa2O3+x solid solution nanocrystals could be precisely tuned in the range of 4.43 to 3.70 eV by elaborately controlling the content of zinc. The emission of ZnxGa2O3+x solid solution nanocrystals strengthened and red-shifted gradually with the increase of x value, and ZnGa2O4 nanocrystals showed an intense blue emission. XPS results revealed that ZnxGa2O3+x binding energy of O2− 1s increased with the increase of the x value, indicating the decrease of the oxygen vacancies (Vo*) of Oh sites and the increase of the symmetry of the Ga–O octahedron, which resulted in the emission red-shift of ZnxGa2O3+x solid solution.