Elongation of Triplet Lifetime Caused by Intramolecular Energy Hopping in Diphenylanthracene Dyads Oriented to Undergo Efficient Triplet-Triplet Annihilation Upconversion†

Masaya Kanoh; Yasunori Matsui; Kiyomasa Honda; Yuto Kokita; Takuya Ogaki; Eisuke Ohta; Hiroshi Ikeda

doi:10.1021/acs.jpcb.1c01982

Elongation of Triplet Lifetime Caused by Intramolecular Energy Hopping in Diphenylanthracene Dyads Oriented to Undergo Efficient Triplet-Triplet Annihilation Upconversion†

J Phys Chem B. 2021 May 13;125(18):4831-4837. doi: 10.1021/acs.jpcb.1c01982. Epub 2021 Apr 23.

Authors

Masaya Kanoh¹, Yasunori Matsui^{1

2}, Kiyomasa Honda¹, Yuto Kokita¹, Takuya Ogaki^{1

2}, Eisuke Ohta^{1

2}, Hiroshi Ikeda^{1

2}

Affiliations

¹ Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan.
² The Research Institute for Molecular Electronic Devices (RIMED), Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan.

PMID: 33891418
DOI: 10.1021/acs.jpcb.1c01982

Abstract

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 (τ_T) and different TTA rate constants than those of the parent DPA. The larger τ_T 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.