Silicon Nanocrystals Functionalized with Pyrene Units: Efficient Light-Harvesting Antennae with Bright Near-Infrared Emission
The Journal of Physical Chemistry Letters2014Vol. 5(19), pp. 3325–3329
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Mirko Locritani, Yixuan Yu, Giacomo Bergamini, Massimo Baroncini, Jennifer K. Molloy, Brian A. Korgel, Paola Ceroni
Abstract
Pyrene chromophores were attached to silicon nanocrystals (SiNCs) with diameters of 2.6 and 5.0 nm to provide light-harvesting antennae for enhanced optical absorption. Efficient energy transfer from the pyrene moieties to the SiNCs was observed to induce bright visible (2.6 nm) or near-infrared (NIR) (5.0 nm) photoluminescence (PL). The 5.0 nm diameter pyrene-derivatized SiNCs exhibited NIR PL emission that was insensitive to dioxygen, with a 40% quantum yield and long lifetime (hundreds of μs).
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