Journal article

Determinants of the efficiency of photon upconversion by triplet-triplet annihilation in the solid state: zinc porphyrin derivatives in PVA

Ranjana Rautela, Neeraj K Joshi, Sacha Novakovic, Wallace WH Wong, Jonathan M White, Kenneth P Ghiggino, Matthew F Paige, Ronald P Steer



Spectroscopic, photophysical and computational studies designed to expose and explain the differences in the efficiencies of non-coherent photon upconversion (NCPU) by triplet-triplet annihilation (TTA) have been carried out for a new series of alkyl-substituted diphenyl and tetraphenyl zinc porphyrins, both in fluid solution and in solid films. Systematic variations in the alkyl-substitution of the phenyl groups in both the di- and tetraphenyl porphyrins introduces small, but well-understood changes in their spectroscopic and photophysical properties and in their TTA efficiencies. In degassed toluene solution TTA occurs for all derivatives and produces the fluorescent S2 product states in a..

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Awarded by Australian Research Council (ARC) Centre of Excellence in Exciton Science

Awarded by ARC Future Fellowship

Funding Acknowledgements

The authors are pleased to acknowledge the continuing support of this research by the Natural Sciences and Engineering Research Council of Canada via Discovery Grants to MFP and RPS. We also gratefully acknowledge financial support from the Canada Foundation for Innovation, Western Economic Diversification, the University of Saskatchewan, and the Government of Saskatchewan. WestGrid and Compute Canada Calcul Canada provided computational support. KPG and WWHW are supported by the Australian Research Council (ARC) Centre of Excellence in Exciton Science (CE170100026) and WWHW has additional support from the ARC Future Fellowship scheme (FT130100500). This work also has 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.