Quantum confinement effect in electroluminescent porous silicon |
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| Authors: | Rongqiu Wang Jingjian Li Yong Chen Ming Tang Yu Wang Shengmin Cai Zhongfan Liu |
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| Institution: | (1) Center for Intelligent Materials Research, College of Chemistry and Molecular Engineering, Peking University, 100871 Beijing, China;(2) Present address: Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, China |
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| Abstract: | 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. |
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| Keywords: | porous silicon electroluminescence voltage tuning luminescence red shift quantum confinement effect |
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