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Monoexponential Microsecond Decay of Blue Photoluminescence in Aged Porous Silicon Prepared with Ar+ 488nm |
| LI Peng1;MA Yu-rong1,2;WANG Guan-zhong1;FANG Rong-chuan1 |
| 1Department of Physics, University of Science and Technology of China, Hefei 230026
2Laboratory of Excited State Processes, Changchun Institute of Physics, Chinese Academy of Sciences, Changchun 130021
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| Cite this article: |
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LI Peng, MA Yu-rong, WANG Guan-zhong et al 1998 Chin. Phys. Lett. 15 382-384 |
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Abstract Blue photoluminescence is observed in aged porous silicon samples anodized under Ar+ 488 nm laser illumination. No samples have been undergone any heating treatment process. Both nanosecond and microsecond decay of blue photoluminescence have been measured. Samples show a good monoexponential microsecond decay with lifetimes of about 5.3μs . Photoluminescence excitation spectra of blue and red Photoluminescence indicate there is a large Stokes shift (about 800-900meV) in the excitation spectra of red photoluminescence while no this marked Stokes shift in that of blue photoluminescence. The possible origin of the photoluminescence is discussed based on the experimental results.
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| Keywords:
78.55.-m
78.47.+p
78.60.-w
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Published: 01 May 1998
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