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Science 5 August 1994:
Vol. 265. no. 5173, pp. 765 - 768
DOI: 10.1126/science.265.5173.765
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Articles

Excimers and Exciplexes of Conjugated Polymers

Samson A. Jenekhe 1 and John A. Osaheni 1

1 Department of Chemical Engineering and Center for Photoinduced Charge Transfer, University of Rochester, Rochester, NY 14627, USA.

Observations of intermolecular excimers in several pgr-conjugated polymers and exciplexes of these polymers with tris(p-tolyl) amine are reported. It is shown that the luminescence of conjugated polymer thin films originates from excimer emission and that the generally low quantum yield is the result of self-quenching. Thus, in sufficiently dilute solution, the "single-chain" emission has a quantum yield of unity. Exciplex luminescence and exciplex-mediated charge photogeneration have much higher quantum yields than the excimer-mediated photophysical processes. These results provide a basis for understanding and controlling the photophysics of conjugated polymers in terms of supramolecular structure and morphology.

Submitted on March 31, 1994
Accepted on June 16, 1994


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