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Near white light emission from ZnO nanostructures

Published online by Cambridge University Press:  03 March 2011

Sanjaya Brahma ,
P. Jaiswal ,
K. K. Nanda ,
L. M. Kukreja  and
S.A. Shivashankar
Sanjaya Brahma
Affiliation:
Materials Research Centre
P. Jaiswal
Affiliation:
Materials Research Centre
K. K. Nanda
Affiliation:
Materials Research Centre
L. M. Kukreja
Affiliation:
Raja Ramanna Centre for Advanced Technology, Indore-452013, India
S.A. Shivashankar
Affiliation:
Materials Research Centre Centre for Nanoscale Science and Engineering, Indian Institute of Science, Bangalore-560012
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Abstract

We report white light emission from ZnO nanostructures in powder form, prepared by microwave irradiation-assisted chemical synthesis, in the presence of a structure directing agent. Determination of their crystallinity, actual shape, and orientation was made using X-ray diffraction, scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and optical properties have been studied through photoluminescence (PL), measured using He-Cd laser (325 nm) as the excitation source. There is a noticeable variation in the luminescence correlated with variation of process parameters, such as microwave power, duration of irradiation, and the type/concentration of surfactants. The CIE (Commission Internationale l’Eclairage) diagram shows that the luminescence lies in yellow region of the color space. As the luminescence from the powder of ZnO lies in the yellow region, it is possible to produce white light from the powder of ZnO by using a blue laser as the excitation source.

Keywords

microwave heatingnanostructureoptical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1303: Symposium Y – Nanomaterials Integration for Electronics, Energy and Sensing , 2011 , mrsf10-1303-y03-07
Copyright
Copyright © Materials Research Society 2011

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References

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