Ultrafast and Robust UV Luminescence from Cu-Doped ZnO Nanowires Mediated by Plasmonic Hot Electrons

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• 作者：Xiaohu Huang ; Rui Chen ; Chen Zhang ; Jianwei Chai ; Shijie Wang ; Dongzhi Chi and Soo Jin Chua
• 刊名：Advanced Optical Materials
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：4
• 期：6
• 页码：960-966
• 全文大小：1551K
• ISSN：2195-1071

文摘

Leveraging on plasmonic hot electrons is regarded as an emerging strategy for electron–hole separation toward efficient photovoltaics and photocatalysis, but its application in electron–hole recombination for illumination is rarely explored. Herein, a significantly improved ultraviolet luminescence is reported from Cu-doped ZnO nanowires (NWs) through dopant mediated generation and transfer of plasmonic hot electrons. Through coupling the Cu dopants-correlated green luminescence in Cu-doped ZnO NWs with the localized surface plasmon resonance of Au nanoparticles (NPs), UV emission from the NWs is enhanced by a factor of ≈280 and its lifetime drops from 2.45 ns to about 18 ps after covering the NWs with Au NPs. Moreover, robust UV emission sustains from room temperature to low temperature. This work extends the applications of plasmonic hot electrons and provides an appealing route toward achieving intense, ultrafast, and temperature-robust luminescence, which holds great potential in light-emitting diode and laser diodes for illumination, optical communication, and biomedical applications.