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研究论文

多孔硅电致发光随时间淬灭伴随的峰位红移现象

  • 王荣秋
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  • 北京大学化学与分子工程学院智能材料研究中心

收稿日期: 1998-02-28

  修回日期: 1998-02-28

  网络出版日期: 1998-02-28

The Time Dependent Red Shift Phenomenon of Visible Electroluminescence of Porous Silicon

  • Wang Rongqiu Li Jingjian Cai Shengmin Liu Zhongfan
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  • (Center for Intelligent Materials Research, College of Chem. and Molecular Engineering,Peking Univ., Beijing 100871)

Received date: 1998-02-28

  Revised date: 1998-02-28

  Online published: 1998-02-28

摘要

本文着重研究了多孔硅(PorousSilicon,简称PS)在阴极偏压下过硫酸铵溶液中电压调制的电致发光(Electroluminescence,简称EL)现象.发现在定电压下,随极化时间的增长电致发光强度减小并伴随着光谱红移现象.通过红外、拉曼、AFM及光电化学等手段对电致发光的淬灭机制进行了研究,结果表明,在电致发光过程中强氧化剂向多孔硅注入空穴使PS表面氧化,导致小粒径的硅晶逐渐被剥落,造成光谱高能部分首先淬灭并出现随时间变化的电致发光红移现象.这些结果支持量子限制效应在多孔硅液相电致发光中起着重要作用

本文引用格式

王荣秋 . 多孔硅电致发光随时间淬灭伴随的峰位红移现象[J]. 电化学, 1998 , 4(1) : 60 -65 . DOI: 10.61558/2993-074X.2678

Abstract

The electroluminescence (EL) of ntype 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, MicroRaman, 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 voltagetunable electroluminescence and the timedependent red shift of the EL spectra support that quantum confinement effect (QCE) plays an important role in the electroluminescence in liquid contact.

参考文献

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