Figure 4.

PL spectra. Room-temperature PL spectra of (a) the hexagonally patterned ZnO nanowire arrays and (b) ZnO buffer, respectively. Two peaks attributed to extionic recombination (IUV) and defect-related emission (IDL) are clearly seen. (c) The variation of UV-to-DL emission intensity ratio (IUV/IDL) of ZnO samples.

Kuo and Lin Nanoscale Research Letters 2014 9:75   doi:10.1186/1556-276X-9-75
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