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2020 | OriginalPaper | Chapter

17. Synergetic Photon Upconversion Realized by a Controlled Toroidal Interaction in Hexaarylbenzene Derivatives

Author : Tadashi Mori

Published in: Photosynergetic Responses in Molecules and Molecular Aggregates

Publisher: Springer Singapore

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Abstract

Triplet-triplet annihilation (TTA) is the most promising photon upconversion (UC) sequence, where a weak light source such as sun light can be used to frequency upconvert the visible to near-infrared light into a photon with a more useful wavelength, applicable in such as the solar cell devices. Although this anti-Stokes shift emission has long been known, and their application has been extensively investigated, less has been explored the effect on the structural modification of the relevant sensitizer and acceptor chromophores. Motivated by a beautiful and functional cylindrical structure of light-harvesting proteins, as well as recent investigation on the cyclic array of nano-wires, we prepared the derivatives of hexaarylbenzene (HAB) containing 9,10-diphenylanthracene and 2,5-diphenyloxazole units as model acceptor systems to investigate the efficiency of TTA-UC and the relevant photophysical processes. The dynamics of propeller-shaped HAB structures as well as toroidal interaction between the peripheral aromatic rings has been well investigated by combined experimental and theoretical studies on their chiroptical properties. Yet preliminary, we found that through the synergetic interaction of the peripheral chromophores, effective energy migration and hopping become possible, to facilitate the efficient TTA-UC, that can be switched on and off by modulation of the strength of toroidal interaction of the relevant HAB emitter. Further possibilities of photosynergetic effects in the TTA-UC process are also discussed.

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Metadata
Title
Synergetic Photon Upconversion Realized by a Controlled Toroidal Interaction in Hexaarylbenzene Derivatives
Author
Tadashi Mori
Copyright Year
2020
Publisher
Springer Singapore
DOI
https://doi.org/10.1007/978-981-15-5451-3_17

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