Microtech2010 2010

Stable colloidal dispersion of luminescing silicon nanoparticles for inkjet printing

A. Gupta, A.S.G. Khalil, M. Winterer, H. Wiggers
Universit├Ąt Duisburg-Essen, DE

Keywords: silicon nanoparticles, Inkjet printing, colloidal dispersion


In this study, we synthesized Si-NPs with mean diameter about 4.2 nm in a microwave plasma reactor. In order to disperse these Si-NPs in organic solvent, the surface of freshly etched Si-NPs was modified with alkyl groups using thermally induced alkylation. The Si-NPs show PL emission in the visible with high PL intensity due to quantum confinement effects. Freshly etched and functionalized Si-NPs show bright red luminescence under UV illumination. The functionalized Si-NPs form stable and optically transparent dispersion in a variety of organic solvents due to presence of alkyl groups on their surface. The stable dispersions of functionalized Si-NPs in organic solvents were used to form functional Si-NPs films by inkjet-printing. The optical properties of printed layer were studied by photoluminescence spectroscopy indicating quenching effects and multi-phonon absorption.
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