Abstract
The electroluminescence (EL) of ntype porous silicon (PS) in a persulphate solution under cathodic polarization was studied. A significant red shift in the luminescence spectra with the increase of polarization time, as well as a blue shift with the increase of cathodic polarization, have been found. FTIR, MicroRaman, AFM and photoelectrochemical techniques have been used to investigate the structure of PS before and after the electroluminescence emission. All these results show that the surface of PS has been oxidized by the persulphate during the EL emission, and accompanied by the stripping of small silicon nanocrystallite, which leades to the red shift of the electroluminescence spectrum. Both of the voltagetunable electroluminescence and the timedependent red shift of the EL spectra support that quantum confinement effect (QCE) plays an important role in the electroluminescence in liquid contact.
Publication Date
1998-02-28
Online Available Date
1998-02-28
Revised Date
1998-02-28
Received Date
1998-02-28
Recommended Citation
Rongqiu Wang, Jingjian Li, Shengmin Cai, Zhongfan Liu.
The Time Dependent Red Shift Phenomenon of Visible Electroluminescence of Porous Silicon[J]. Journal of Electrochemistry,
1998
,
4(1): Article 13.
DOI: 10.61558/2993-074X.2678
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol4/iss1/13
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