Optical luminescence from alkyl-passivated Si nanocrystals under vacuum ultraviolet excitation: Origin and temperature dependence of the blue and orange emissions.

Chao, Y.; Houlton, A.; Horrocks, B.R.; Hunt, M.R.C.; Poolton, N.R.J.; Yang, J.; Siller, L.

Abstract

The origin and stability of luminescence are critical issues for Si nanocrystals which are intended for use as biological probes. The optical luminescence of alkyl-monolayer-passivated silicon nanocrystals was studied under excitation with vacuum ultraviolet photons (5.1-23 eV). Blue and orange emission bands were observed simultaneously, but the blue band only appeared at low temperatures (< 175 K) and with high excitation energies (> 8.7 eV). At 8 K, the peak wavelengths of the emission bands were 430 +/- 2 nm (blue) and 600 +/- 2 nm (orange). The orange and blue emissions originate from unoxidized and oxidized Si atoms, respectively

Citation

Chao, Y., Houlton, A., Horrocks, B., Hunt, M., Poolton, N., Yang, J., & Siller, L. (2006). Optical luminescence from alkyl-passivated Si nanocrystals under vacuum ultraviolet excitation: Origin and temperature dependence of the blue and orange emissions. Applied Physics Letters, 88(26), 1-3. https://doi.org/10.1063/1.2216911

• Journal Article Type: Article
• Publication Date: 2006-06
• Journal: Applied Physics Letters
• Print ISSN: 0003-6951
• Electronic ISSN: 1077-3118
• Publisher: American Institute of Physics
• Peer Reviewed: Peer Reviewed
• Volume: 88
• Issue: 26
• Pages: 1-3
• DOI: https://doi.org/10.1063/1.2216911
• Public URL: https://durham-repository.worktribe.com/output/1580952
• Publisher URL: http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=APPLAB000088000026263119000001&idtype=cvips&gifs=yes