Picosecond Time Resolved Electron Injection from Excited Cresyl Violet Monomers 
and Cd3P2 Quantum Dots into TiO2

Kietzmann, Reinhard; Willig, Frank; Weller, H.; Vogel, R.; Nath, D. N.; Eichberger, Rainer; Liska, P.; Lehnert, Joachim

doi:10.1080/00268949108041162

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Picosecond Time Resolved Electron Injection from Excited Cresyl Violet Monomers and Cd₃P₂ Quantum Dots into TiO₂

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Kietzmann, Reinhard
Fritz Haber Institute, Max Planck Society;

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Willig, Frank
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Weller, H.
Fritz Haber Institute, Max Planck Society;
Hahn-Meitner-Institut fur Kernforschung Berlin GmbH;

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Vogel, R.
Fritz Haber Institute, Max Planck Society;
Hahn-Meitner-Institut fur Kernforschung Berlin GmbH;

/persons/resource/persons272783

Nath, D. N.
Fritz Haber Institute, Max Planck Society;

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Eichberger, Rainer
Fritz Haber Institute, Max Planck Society;
Hahn-Meitner-Institut fur Kernforschung Berlin GmbH;

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Liska, P.
Fritz Haber Institute, Max Planck Society;
Institute of Physical Chemistry, Swiss Federal Institute of Technology;

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Lehnert, Joachim
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Kietzmann, R., Willig, F., Weller, H., Vogel, R., Nath, D. N., Eichberger, R., et al. (1991). Picosecond Time Resolved Electron Injection from Excited Cresyl Violet Monomers and Cd₃P₂ Quantum Dots into TiO₂. Molecular Crystals and Liquid Crystals, 194(1), 169-180. doi:10.1080/00268949108041162.

Cite as: https://hdl.handle.net/21.11116/0000-000A-6702-0

Abstract

Picosecond time resolved luminescence was employed for monitoring the decay of electronic excited reactants on the surface of oxide semiconductors. Decay of cresyl violet monomers was determined on TiO₂ and on α-Al₂O₃ by measuring decay curves over a wide range of very low coverages. The decay curves showed a characteristic opposite dependence on coverage on the oxide semiconductor with a low conduction band edge, i.e. TiO₂, compared to the oxide semiconductor with a high conduction band edge, i.e. α-Al₂O₃. The dominating time constant for cresyl violet monomer decay was in the range of 280 ps on TiO₂ and 560 ps on α-Al₂O₃. In both cases quenching was attributed to electron transfer.
At room temperature the decay of excited Cd₃P₂ quantum dot luminescence was faster than 1 ps when the dots were attached to TiO₂ colloidal particles in solution. The ultrafast decay was ascribed to electron injection.