Figure 2From: Influence of helium-ion bombardment on the optical properties of ZnO nanorods/p-GaN light-emitting diodes Room-temperature photoluminescence spectrum for ZnO nanorods. (a) As grown, (b) after irradiation with fluency of approximately 2 × 1013 ions/cm2, (c) after irradiation with fluency of approximately 4 × 1013 ions/cm2, and (d) the PL spectra of all the samples together for comparison.Back to article page