Photo-induced electron transfer in CdSe nanocrystals passivated by quinone derivatives
2007
The directed surface passivation of semiconductor CdSe, CdSe/ZnS nanocrystals (NC) by di-meso-pyridyl substituted
porphyrins (H 2 P) 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.
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