Quantum confinement effect in electroluminescent porous silicon  

作　　者：王荣秋 李经建 陈泳 汤鸣 王宇 蔡生民 刘忠范 

出　　处：《Science China Chemistry》1998年第4期337-344,共8页中国科学（化学英文版）

基　　金：theNationalNaturalScienceFoundationofChina (GrantNo .2 95 730 91)

摘　　要：The voltage\|tuned electroluminescence (EL) of n\|type porous silicon (PS) in a persulphate solution under cathodic polarization was studied. A blue shift with the increase of cathodic polarization and a time\|dependent red shift at constant potential of EL spectra have been observed. To investigate the voltage tuning mechanism and luminescence quenching mechanism for the electroluminescence of PS, FT\|IR, AFM and electrochemical methods were used. The results show that the voltage\|tuned electroluminescence can be attributed to the selective excitation of different sizes of PS crystallites, which agrees with the "quantum confinement model" in PS luminescence.The voltage-tuned electroluminescence (EL) of n-type porous silicon (PS) in a persulphate solution under cathodic polarization was studied. A blue shift with the increase of cathodic polarization and a time-dependent red shift at constant potential of EL spectra have been observed. To investigate the voltage tuning mechanism and luminescence quenching mechanism for the electroluminescence of PS, FT-IR, AFM and electrochemical methods were used. The results show that the voltage-tuned electroluminescence can be attributed to the selective excitation of different sizes of PS crystallites, which agrees with the “quantum confinement model” in PS luminescence.

关 键 词：porous silicon ELECTROLUMINESCENCE voltage tuning LUMINESCENCE red SHIFT quantum CONFINEMENT effect. 

分 类 号：TN383.2[电子电信—物理电子学]