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(Color online) (a) and (c) Tilted-view SEM images of as-grown ZnO NWs and NWs covered by MgO. The inset in (a) clearly shows the hexagonal cross-section of ZnO NW. (b) HRTEM image and SAED pattern of an individual NW. (d) and (e) TEM images of ZnO/MgO CS-NWs and two EDX spectra obtained from upper and lower regions of a single NW.
(Color online) (a) Room-temperature PL spectra of ZnO NWs with and without MgO coating layer. (b) I-V characteristic of the CS-NW LD, its inset is a log-log plot of the I-V curve under low forward bias.
(Color online) EL spectra of the CS-NW LD under different injection currents. The left and right insets exhibit an energy-band alignment under forward bias and the superlinear dependence of integrated emission intensity on injection current.
(a) Two lasing spectra from our NW (right) and film (left) LDs, which were measured in the same experimental conditions. (b) The lasing spectra of the CS-NW LD obtained in two successive measurements. (c) A representative lasing spectrum showing that the emission wavelength is separated into two different regions.
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