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Title of Journal: Appl Phys A

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Abbravation: Applied Physics A

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Springer Berlin Heidelberg

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DOI

10.1002/chin.199017265

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1432-0630

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Effects of natural oxidation on the photoluminesce

Authors: Yanmei Xu Yinghui Han
Publish Date: 2014/07/14
Volume: 117, Issue: 3, Pages: 1557-1562
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Abstract

In this work Si nanocrystals SiNCs have been prepared by pulsed laser ablation technique in dichloromethane and the microstructure and photoluminescence PL properties of the SiNCs before and after natural oxidation were investigated Transmission electron microscopy and Raman results show that the average diameter of the SiNCs is 242 nm in the dichloromethane solution Blue–violet PL with a lifetime of 46 ns is observed at room temperature and the PL peak shifts toward longer wavelength with the red shift of excitation wavelength The PL excitation spectrum indicates that the bandgap of the SiNCs in solution is 264 eV which confirms that the blue–violet PL originates from interband transition of SiNCs caused by quantum confinement effect The PL peak red shifts to 607 nm after natural oxidation and the peak lifetime of which is slow down to 131 μs The fixed PL peak excited by different wavelengths and the slow PL decay time indicate that interface defects become the main PL mechanism after natural oxidation The results will add new information for understanding the PL mechanism of SiNCs in different environments

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