Abstract
Ytterbium and erbium co-doped ZnO powders were prepared through simple and easy-controlled hydrothermal method. The phase, structure, morphology and surface elements of the obtained samples were characterized by X-ray diffraction, scanning electron microscopy (SEM), energy dispersive spectrometer, transmission electron microscope (TEM) and UV–Visible spectrophotometry. The performance of upconversion photoluminescence was investigated by fluorescence spectrophotometer. The ZnO:Yb3+,Er3+ powder samples generate red emission of 660 nm under the excitation wavelength 980 nm. The effect of Yb3+ doped concentration on the upconversion luminescence was studied. The results show that the optimal doped concentration is 20 mol%, and the back energy transfer will lead to fluorescence quenching when the concentration is increased again.
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