Exciton Dynamics of Photoexcited Pendant Porphyrin Polymers in Solution and in Thin Films
AL Stevens, S Novakovic, JM White, WWH Wong, TA Smith, KP Ghiggino, MF Paige, RP Steer
Journal of Physical Chemistry A | American Chemical Society | Published : 2018
Several new polymers with rotatable zinc porphyrin pendants have been synthesized and their optical spectroscopic and photophysical properties, including upconversion efficiencies, determined in both fluid solution and thin films. Comparisons made with the β-substituted zinc tetraphenylporphyrin monomers and ZnTPP itself reveal that the yield of triplets resulting from either Q-band or Soret-band excitation of the polymers is surprisingly small. A detailed kinetic analysis of the fluorescence decays and transient triplet absorptions of the substituted monomers and their corresponding polymers reveals that this phenomenon is due to two parallel internal singlet quenching processes assigned to..View full abstract
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Awarded by Australian Research Council
The authors are pleased to acknowledge the Natural Sciences and Engineering Research Council of Canada and the Australian Research Council Centre of Excellence in Exciton Science (CE170100026) for their continuing financial support. The Saskatchewan Structural Science Centre provided equipment and technical assistance. Phillip Boutin and Neeraj Joshi are thanked for their preliminary work on this project. A.L.S. thanks the University of Saskatchewan and the College of Arts and Science for partial financial support. W.W.H.W. was supported by an Australian Research Council Future Fellowship (FT130100500). This work was made possible by support from the Australian Renewable Energy Agency which funds the project grants within the Australian Centre for Advanced Photovoltaics (ACAP). Responsibility for the views, information, or advice expressed herein is not accepted by the Australian Government.