Multi-photon induced ultraviolet emission from hexagram-shaped ZnO nanorods
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- Zhu, G.P., Zhu, J., Xu, C.X. et al. Appl. Phys. A (2009) 95: 381. doi:10.1007/s00339-009-5094-5
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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.