Electric excited states of C 60 film investigated by electromodulation of luminescence
- 8 December 1995
- proceedings article
- Published by SPIE-Intl Soc Optical Eng
- Vol. 2530, 41-47
- https://doi.org/10.1117/12.228123
Abstract
Electric field induced luminescence quenching in C60 polycrystalline films has been investigated. Its efficiency increases with excitation energy above 2.3 eV, whereas no quenching is observed in the range 1.77 - 2.3 eV, within the experimental resolution. Furthermore, the luminescence efficiency decreases towards higher energy with a drop above 2.3 eV. The photocarrier generation efficiency also shows a sharp increase above 2.3 eV in addition to weak structures in the range 1.5 - 2.3 eV. The increase of the electric field induced luminescence quenching efficiency, the drop of the luminescence yield as well as the sharp increase of the photocarrier generation efficiency above 2.3 eV, are interpreted in terms of branching either in the excitation or relaxation processes involving intermolecular charge transfer excited states. In the range 1.77 - 2.3 eV, the photophysical properties are governed by intramolecular interaction (Frenkel excitons). The solid state specific absorption in the range 2.3 - 3.0 eV has also been correlated to the intermolecular charge transfer states.Keywords
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