Optical properties of Eu3+, Dy3+ co-doped ZnO nanocrystals
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Abstract:
ZnO nanocrystals doped with trivalent europium ions (Eu3+) and dysprosium ions (Dy3+) were synthesized by the precipitation method. The structural and optical properties of the samples are investigated by the X-ray diffraction (XRD) and photoluminescence (PL). The results show that rare earth ions are incorporated into the lattice of ZnO, and the combination of blue, green and red emissions can be obtained. Specially, the emission can be obtained even under the nonresonant excitation of 320 nm, which is explained based on the energy transfer. The concentration quenching mechanism is also presented in this paper.
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This work has been supported by the National Natural Science Foundation of China （Nos.61106059 and 11304120）, the Encouragement Founda- tion for Excellent Middle-aged and Young Scientist of Shandong Province （Nos.BS2011NJ003 and BS2012CL005）, and the Sci- ence-Technology Program of Higher Education Institutions of Shandong Province （No.J 11LA 10）.
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