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Proceedings Paper

Photo-induced electron transfer in CdSe nanocrystals passivated by quinone derivatives
Author(s): Alexander A. Yarovoi; Eduard I. Zenkevich
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Paper Abstract

The directed surface passivation of semiconductor CdSe, CdSe/ZnS nanocrystals (NC) by di-meso-pyridyl substituted porphyrins (H2P) as well as quinone and his derivatives with increasing electron accepting abilities has been realized via the reversible non-covalent self-assembly interaction of organic and inorganic subunits. The formation of "NC-organic ligand" composites leads to the observed NC luminescence quenching (intensity decrease and decay shortening). It was shown that NC luminescence quenching by directly attached porphyrin ligands is due to the exciton non-radiative deactivation via processes realized in CdSe core interface. In this case, strong exciton-phonon interactions and charge localization depend essentially on physico-chemical and electronic properties (inductive and mesomeric effects) of the ligand and linker group. In NCs capped with quinones, using steady-state and picosecond transient spectroscopy it was found that the luminescence quenching is due to the photoinduced electron transfer and strongly depends on redox properties of quinone and its derivatives.

Paper Details

Date Published: 31 July 2007
PDF: 6 pages
Proc. SPIE 6728, ICONO 2007: Novel Photonics Materials; Optics and Optical Diagnostics of Nanostructures, 67282K (31 July 2007); doi: 10.1117/12.752450
Show Author Affiliations
Alexander A. Yarovoi, Institute of Molecular and Atomic Physics (Belarus)
Eduard I. Zenkevich, Institute of Molecular and Atomic Physics (Belarus)

Published in SPIE Proceedings Vol. 6728:
ICONO 2007: Novel Photonics Materials; Optics and Optical Diagnostics of Nanostructures
Oleg Andreevich Aktsipetrov; Sergey V. Gaponenko; Nikolay I. Zheludev; Vladimir M. Shalaev, Editor(s)

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