Fabrication of ZnO∶Eu3+ Films by Using the Two Step Method and Its Optical Properties Research
Europium doped Zinc oxide (ZnO∶Eu3+) thin films of wurtzite structure with c-axie preferred orientation along (002) diffraction peak was successfully synthesized by the two-step method on a common glass substrate.Eu3+ doped ZnO thin films were assembled on the ZnO seed layer prepared on a glass substrate by CS-300 DC magnetron sputtering device in advance using a hydrothermal method.The Ⅹ-ray diffraction (XRD) spectra analysis indicate that the film crystallinity and average crystal size decrease and (002) diffraction peak slightly shift to little angle with Eu3+-doped.The surface scanning electron microscope (SEM) photographs of films show that the film became compact with uniformly distributed grains.Photoluminescence (PL) tests reveal that an effective energy transfer between ZnO matrixes and Eu3+.Under the 325 nm excitation wavelength at room temperature,a sharp and intense red characteristic peak locate at around 615 nm wavelength in the visible region can be observed from the PL spectra of ZnO∶Eu3+ thin films,and the peak intensity increase at first then decrease,the best Eu3+ doped molar percentage is 5％.The results obtained in the experiment provide part of the basis for expanding the application areas of ZnO∶Eu3+ films.
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