Photoinduced absorption of conjugated polymer/C60 solutions: Evidence of triplet-state photoexcitations and triplet-energy transfer in poly(3-alkylthiophene)

Janssen, R. A. J.; Sariciftci, N. S.; Heeger, A. J.
June 1994
Journal of Chemical Physics;6/15/1994, Vol. 100 Issue 12, p8641
Academic Journal
We present spectral evidence of the efficient photogeneration of triplet-state excitations in poly(3-alkylthiophene), P3AT, solutions. The steady-state photoinduced absorption spectra display a PIA band centered at 1.50 eV which is attributed to a dipole-allowed triplet–triplet transition. Photoexcitation of P3AT solutions containing C60, results in an efficient energy transfer reaction and provides an estimate for the P3AT triplet-state energy of 1.57–1.72 eV.


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