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Temperature dependence of the carrier concentrations and mobilities (inset) of the different samples. Triangles: data of sample A prepared using the gas mixture; solid and opened circles: data of sample B prepared using NO gas.
characteristics of the ZnO LED measured in the temperature region of . The inset schematically shows the structure of the junction LED.
(a) EL spectra measured at under a fixed forward-biased voltage of . (b) PL spectra of undoped -type and N-doped -type ZnO layers at .
EL spectra of the ZnO LED measured at room temperature under various injection currents. The inset shows the normalized EL spectra in which blueshift of the emission peak is clearly seen.
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