Please use this identifier to cite or link to this item: https://doi.org/17/175702
Title: Controllable synthesis of ZnO nanoparticles with high intensity visible photoemission and investigation of its mechanism
Authors: Lv, Y.
Xiao, W.
Li, W.
Xue, J. 
Ding, J. 
Issue Date: 3-May-2013
Source: Lv, Y.,Xiao, W.,Li, W.,Xue, J.,Ding, J. (2013-05-03). Controllable synthesis of ZnO nanoparticles with high intensity visible photoemission and investigation of its mechanism. Nanotechnology 24 (17) : -. ScholarBank@NUS Repository. https://doi.org/17/175702
Abstract: ZnO is known as a good photoluminescent semiconductor due to its ability to emit visible light. However, the visible emission mechanism is still under debate. In this work, we have successfully synthesized nanoparticles using LiOH, KOH and NaOH as bases and have achieved visible emission of various colours, such as blue, cyan, green and orange. We demonstrate that LiOH is the most efficient base to control the properties of ZnO nanoparticle emission by varying LiOH concentration. Moreover, detailed studies by TEM, UV and XRD show that ZnO particle size plays an important role in the colour of the emitted light and smaller particles tend to emit shorter wavelength photons. The visible emission is suggested to arise from an electron transition from the conduction band to a deep-trapped defect state. Our experimental results suggest the presence of oxygen vacancies on the ZnO nanoparticle surface. © 2013 IOP Publishing Ltd.
Source Title: Nanotechnology
URI: http://scholarbank.nus.edu.sg/handle/10635/64835
ISSN: 09574484
DOI: 17/175702
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