Abstract
The processes leading to the generation of free charges in layers of pure and sensitised poly-(N-epoxypropylcarbazole) are studied by measuring exciplex fluorescence, surface photoconductivity and changes under the action of a static magnetic field with a strength up to 3 kOe. The sensitised polymer was produced by incorporating a rhodamine dye. The effect of oxygen on the values of both photocurrent and magnetic field effects on the photoconductivity and fluorescence is investigated. It is suggested that excited charge transfer complexes, generated by polymer and oxygen molecules in the presence of the dye, represent an intermediate step in the process of the generation of free charge carriers. The magnetosensitivity of both current and fluorescence is conditioned in this case by a change in the rate constant of intersystem crossing in these complexes induced by the magnetic field.
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