Abstract
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.
Published Version
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