Multi-photon induced ultraviolet emission from hexagram-shaped ZnO nanorods
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Zinc oxide (ZnO) nanorods with hexagram cross-section were prepared by vapor-phase transport method. The growth mechanism of the nanorods was discussed by considering diffusion effects of reactant gasses at high supersaturation. A strong ultraviolet peak at 391 nm and a weak visible band depending on the excitation wavelength were observed under the excitation by infrared femtosecond laser. The UV and the visible emission were respectively attributed to four-photon induced photoluminescence (FPPL) and third harmonic generation (THG). The characteristics and the generation mechanism of the FPPL were discussed.
PACS73.61.Ga 73.63.Bd 74.25.Gz 42.65.-k 81.10.Bk
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