6 June 2018 Long-lived-correlated triplet-pair state in an imide substituted poly-thienylene vinylene-based π-conjugated polymer
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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.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Evan Lafalce, Evan Lafalce, Uyen Huynh, Uyen Huynh, Ella Olejnik, Ella Olejnik, Tek P. Basel, Tek P. Basel, Eitan Ehrenfreund, Eitan Ehrenfreund, Zeev Valy Vardeny, Zeev Valy Vardeny, Xiaomei Jiang, 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 . Submission: Received: 22 February 2018; Accepted: 22 May 2018
Received: 22 February 2018; Accepted: 22 May 2018; Published: 6 June 2018
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