Hydrothermal fabrication of well-ordered ZnO nanowire arrays on Zn foil: room temperature ultraviolet nanolasers |
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Authors: | Jong-Yeob Kim Hyeok Jeong Du-Jeon Jang |
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Institution: | (1) School of Chemistry, Seoul National University, NS60, Seoul, 151-747, Republic of Korea; |
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Abstract: | Well-ordered nanowires of the hexagonal wurtzite ZnO having an average diameter of 80 nm, a typical length of 12 μm, and a
mean packing density of 7.5 nanowires μm−2 have been directly grown on Zn foil in a preferred 0001] direction by a hydrothermal process and employed for room temperature
ultraviolet nanolasers. The lasing action of arrayed ZnO nanowires has been observed from 370 to 400 nm with threshold irradiance
of 25 kW cm−2. Photoluminescence decays biexponentially: the fast component is attributed to free-exciton decay, and the slow one is to
bound-exciton decay. The amplitude of the fast component increases whereas its lifetime decreases with the increment of threshold
irradiance, suggesting that ZnO nanowire arrays undergo a change in the lasing mechanism from exciton–exciton scattering to
electron–hole plasma recombination. |
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