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Effect of excitation intensity on fluorescence spectra in ZnO nanostructures and its origin

Content Provider	Springer Nature Link
Author	Zhang, YuGang Zhang, LiDe
Copyright Year	2009
Abstract	ZnO nanostructures with three kinds of morphologies, namely, tetrapod-, rod-, and sheet-like shape, are synthesized by chemical vapor deposition, conventional solution-phase, and hydrothermal methods, respectively. The fluorescence measurements display that the spectra of these nanostructures exhibit similar unexpected change laws with the altering excitation intensity. It is observed that when the excitation intensity increases, for the green emission band, the peak position shows a small blue-shift, the width turns broader, and the intensity grows first stronger and then weaker; for the UV emission band, the peak position exhibits a significant red-shift, and the width and intensity have the similar behaviors with those of the green band. Additionally, the relative intensity of green emission to UV emission decreases gradually. It is clarified that the origin of this abnormal phenomenon is ascribed to the local laser heating effect and the high sensitivity of nanostructures to this heating effect.
Starting Page	4
Ending Page	12
Page Count	9
File Format	PDF
ISSN	16721799
Journal	Science in China Series G
Volume Number	52
Issue Number	1
e-ISSN	18622844
Language	English
Publisher	SP Science in China Press
Publisher Date	2009-01-09
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	ZnO nanostructure fluorescence spectra excitation intensity heating effect Astronomy Mechanics, Fluids, Thermodynamics Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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