The visible photoluminescence (PL) of ZnO is controversial for a long time. At present, the contribution of oxygen interstitial defects to yellow/orange emission from ZnO nanostructures is on debate. In this report, the origin of orange emission from solution- grown ZnO nanorods is investigated using excitation wavelength dependent photoluminescence PL, PL excitation and UV-Vis spectra. These results showed that orange emission may be due to the transition of an electron from shallow defect levels positioned slightly below the conduction band to the singly ionized oxygen vacancies. Hence, it is believed that oxygen interstitials may not be responsible for orange emission from solution grown ZnO nanostructures.

中文翻译：

---

水热法生长的氧化锌纳米棒的橙色光致发光及其缺陷研究

ZnO 的可见光致发光 (PL) 长期以来一直存在争议。目前，氧间隙缺陷对 ZnO 纳米结构黄色/橙色发射的贡献尚有争议。在本报告中，使用激发波长相关的光致发光 PL、PL 激发和 UV-Vis 光谱研究了溶液生长的 ZnO 纳米棒橙色发射的起源。这些结果表明，橙色发射可能是由于电子从略低于导带的浅缺陷能级跃迁到单电离氧空位。因此，据信氧间隙可能不是溶液生长的 ZnO 纳米结构发出橙色光的原因。