Reshaping Formation and Luminescence Evolution of ZnO Quantum Dots by Laser-Induced Fragmentation in Liquid

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• 作者：Haibo Zeng ; Shikuan Yang ; Weiping Cai
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：March 31, 2011
• 年：2011
• 卷：115
• 期：12
• 页码：5038-5043
• 全文大小：1027K
• 年卷期：v.115,no.12(March 31, 2011)
• ISSN：1932-7455

文摘

We reported the fabrication of ZnO quantum dots (QDs) through laser irradiation of ZnO hollow nanospheres in liquid medium for the first time. This process is very rapid, simple, and operated at room temperature and in normal atmospheric pressure. The formed QDs have diameters of 1鈭? nm, which fall in the range of quantum size effect, and can be further tuned through parameters of the laser irradiation process. The monitored photoluminescence (PL) evolution of products well reflects the structure and size changes. The main PL emission bands evolve from blue to green and final ultraviolet peaks; these are corresponding to the changes of defect and crystalline states of products during the process. The laser fragmentation mechanism was proposed according to the laser鈭抧anosphere interaction produced plasma. This kind of reshaping fabrication of QDs could exhibit optical and optoelectronic applications in the related devices.