Ultrafast excitation energy transfer in vinylpyridine terminated silicon quantum dots

Sommer A, Cimpean CR, Kunz M, Oelsner C, Kupka HJ, Kryschi C (2011)


Publication Type: Journal article, Original article

Publication year: 2011

Journal

Original Authors: Sommer A., Cimpean C., Kunz M., Oelsner C., Kupka H.J., Kryschi C.

Publisher: American Chemical Society

Book Volume: 115

Pages Range: 22781-22788

Journal Issue: 46

DOI: 10.1021/jp206495j

Abstract

Water-soluble 2- and 4-vinylpyridine terminated silicon quantum dots (SiQDs) with sizes between 2 and 3 nm were obtained by HF etching of oxidized SiQDs and subsequently passivating with vinylpyridine ligands via thermal hydrosilylation. The functionalized SiQDs emit photoluminescence in the blue-green spectrum with quantum yields around 30%. The photoluminescence is ascribed to radiative recombination of excitons confined to the SiQD core. Indication of efficient electronic interactions between excited ligand states and SiQD conduction band states has been achieved by real-time monitoring excitation relaxation dynamics on the subpicosecond time scale using time-resolved laser spectroscopy techniques. The observed ultrafast excitation relaxation dynamics involving decay and rise dynamics faster than 1 ps were ascribed to electronic excitation energy transfer from an initially photoexcited ligand state to SiQD conduction band states. These results were analyzed by performing a state population analysis on the basis of electron exchange interactions. © 2011 American Chemical Society.

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APA:

Sommer, A., Cimpean, C.R., Kunz, M., Oelsner, C., Kupka, H.J., & Kryschi, C. (2011). Ultrafast excitation energy transfer in vinylpyridine terminated silicon quantum dots. Journal of Physical Chemistry C, 115(46), 22781-22788. https://dx.doi.org/10.1021/jp206495j

MLA:

Sommer, Anja, et al. "Ultrafast excitation energy transfer in vinylpyridine terminated silicon quantum dots." Journal of Physical Chemistry C 115.46 (2011): 22781-22788.

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