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

Lookup NU author(s): Dr Yimin Chao, Professor Andrew HoultonORCiD, Dr Ben Horrocks, Professor Jianhua Yang, Professor Lidija Siller

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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. © 2006 American Institute of Physics.

Publication metadata

Author(s): Chao Y, Houlton A, Horrocks BR, Hunt MRC, Poolton NRJ, Yang J, Siller L

Publication type: Article

Publication status: Published

Journal: Applied Physics Letters

Year: 2006

Volume: 88

Issue: 26

ISSN (print): 0003-6951

ISSN (electronic): 1077-3118

Publisher: American Institute of Physics

URL: http://dx.doi.org/10.1063/1.2216911

DOI: 10.1063/1.2216911

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