Issue 35, 2023

Prospects for useful fission from singlet states higher than S1 in aggregated organic chromophores

Abstract

The few known reports and the likely prospects of finding new efficient routes to exciton fission from higher excited singlet states, Sn (n > 1), are reviewed. Aggregates of molecules that have large S2–S1 electronic energy spacings and/or emit measurable “contra-Kasha” emission may offer further opportunities. Among these, electronically excited molecular systems that exhibit known efficient (T1 + T1) triplet–triplet annihilation producing S2 could exhibit efficient singlet fission in aggregates when appropriately substituted to meet the necessary energy requirements. The potential problem of loss of triplet excitons via 2T1 → Tn>1 + S0 triplet–triplet annihilation following (S2 + S0) singlet fission is addressed. Aggregates of substituted azulenes and aliphatic thiones and dithiones are particularly attractive and are discussed in detail.

Graphical abstract: Prospects for useful fission from singlet states higher than S1 in aggregated organic chromophores

Article information

Article type
Perspective
Submitted
06 Jul 2023
Accepted
21 Aug 2023
First published
23 Aug 2023

Phys. Chem. Chem. Phys., 2023,25, 23384-23394

Prospects for useful fission from singlet states higher than S1 in aggregated organic chromophores

R. P. Steer, Phys. Chem. Chem. Phys., 2023, 25, 23384 DOI: 10.1039/D3CP03201A

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