Photoinduced absorption in polyaniline solutions

L. J. Hartwell; Andrew P. Monkman

doi:10.1117/12.284152

1 December 1997 Photoinduced absorption in polyaniline solutions

L. J. Hartwell, Andrew P. Monkman

Proceedings Volume 3145, Optical Probes of Conjugated Polymers; (1997) https://doi.org/10.1117/12.284152
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

Photoinduced absorption experiments have been performed on solutions of emeraldine base in N-methyl-2-pyrrolidinone at various concentrations. In the energy range 0.5 eV - 1.7 eV photoinduced peak at 1.45 eV and photobleaching starting at 1.7 eV are observed, as is the case for solid films. The additional photoinduced peak at ca 0.9 eV which is seen in emeraldine thin films is not observed in solution, but a clearly resolvable induced feature is seen at 1.2 eV in the solutions. The 0.9 eV feature in films has been ascribed to an intra chain polaronic excitation, and the 1.45 eV feature to a long lived inter chain excitation. However the intensity of the 1.45 eV peak seen in the solutions scales linearly with concentration, clearly implying intra chain origin. The low energy feature of the thin films is either missing in the solution spectra implying it is an inter chain excitation or it substantially blue shifts in solution implying it too is an intra chain excitation but with a more highly dipolar nature. These results are suggestive of a strong role being played here by triplet excitons as well as residual polaronic species.

Citation Download Citation

L. J. Hartwell and Andrew P. Monkman "Photoinduced absorption in polyaniline solutions", Proc. SPIE 3145, Optical Probes of Conjugated Polymers, (1 December 1997); https://doi.org/10.1117/12.284152

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