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Long-lived Triplet State Formation Caused by Intramolecular Energy Hopping in Diphenylanthracene Dyads Oriented to Undergo Efficient Triplet–Triplet Annihilation Upconversion

preprint
submitted on 30.09.2020 and posted on 05.10.2020 by Masaya Kanoh, Yasunori Matsui, KIyomasa Honda, Yuto Kokita, Takuya Ogaki, Eisuke Ohta, Hiroshi Ikeda
Triplet–triplet annihilation (TTA)-assisted photon upconversion (TTA-UC) in three dyads (DPA–Cn–DPA), comprised of two diphenylanthracene (DPA) moieties connected by nonconjugated C1, C2, and C3 linkages (Cn), has been investigated. The performance of these dyads as energy acceptors in the presence of the energy donor platinum octaethylporphyrin are characterized by longer triplet lifetimes (τT) and different TTA rate constants than those of the parent DPA. The larger τT of the linked systems, caused by “intramolecular energy hopping” in the triplet dyad 3DPA*–Cn–DPA, results in a low threshold intensity, a key characteristic of efficient TTA-UC.

History

Email Address of Submitting Author

matsui@chem.osakafu-u.ac.jp

Institution

Osaka Prefecture University

Country

Japan

ORCID For Submitting Author

0000-0002-7719-0071

Declaration of Conflict of Interest

No conflict of Interests.

Version Notes

First submission

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