Long-lived-correlated triplet-pair state in an imide substituted poly-thienylene vinylene-based π-conjugated polymer

Evan Lafalce; Uyen Huynh; Ella Olejnik; Tek P. Basel; Eitan Ehrenfreund; Zeev Valy Vardeny; Xiaomei Jiang

doi:10.1117/1.JPE.8.032217

6 June 2018 Long-lived-correlated triplet-pair state in an imide substituted poly-thienylene vinylene-based π-conjugated polymer

Evan Lafalce, Uyen Huynh, Ella Olejnik, Tek P. Basel, Eitan Ehrenfreund, Zeev Valy Vardeny, Xiaomei Jiang

Author Affiliations +

Funded by: National Science Foundation (NSF), Division of Materials Research (DMR)

Journal of Photonics for Energy, Vol. 8, Issue 3, 032217 (June 2018). https://doi.org/10.1117/1.JPE.8.032217

Abstract

We report on the photophysical properties of a soluble thienylene-vinylene π-conjugated polymer, namely imide poly-thienylene vinylene. Ultrafast pump probe spectroscopy reveals that a broad photoinduced absorption (PA) band is immediately photogenerated along with a narrower PA from the photoinduced singlet excitons. The broad PA is susceptible to magnetic field and thus is assigned to a correlated triple pair state. This feature shows a long lifetime persisting into the μs time domain, in contrast to the singlet exciton PA, which quickly decays on a 10-ps timescale. The steady-state PA spectrum is identical to the transient PA spectrum of the triplet pair state but shows a magnetic field response that is typical to isolated triplet excitons.

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Evan Lafalce, Uyen Huynh, Ella Olejnik, Tek P. Basel, Eitan Ehrenfreund, Zeev Valy Vardeny, and Xiaomei Jiang "Long-lived-correlated triplet-pair state in an imide substituted poly-thienylene vinylene-based π-conjugated polymer," Journal of Photonics for Energy 8(3), 032217 (6 June 2018). https://doi.org/10.1117/1.JPE.8.032217

Received: 22 February 2018; Accepted: 22 May 2018; Published: 6 June 2018

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