Details

Autor(en) / Beteiligte

• Yong, Chaw Keong
• Musser, Andrew J.
• Bayliss, Sam L.
• Lukman, Steven
• Tamura, Hiroyuki
• Bubnova, Olga
• Hallani, Rawad K.
• Meneau, Aurélie
• Resel, Roland
• Maruyama, Munetaka
• Hotta, Shu
• Herz, Laura M.
• Beljonne, David
• Anthony, John E.
• Clark, Jenny
• Sirringhaus, Henning

Titel

The entangled triplet pair state in acene and heteroacene materials

Ist Teil von

• Nature communications, 2017-07, Vol.8 (1), p.15953-15953, Article 15953

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Entanglement of states is one of the most surprising and counter-intuitive consequences of quantum mechanics, with potent applications in cryptography and computing. In organic materials, one particularly significant manifestation is the spin-entangled triplet-pair state, which mediates the spin-conserving fission of one spin-0 singlet exciton into two spin-1 triplet excitons. Despite long theoretical and experimental exploration, the nature of the triplet-pair state and inter-triplet interactions have proved elusive. Here we use a range of organic semiconductors that undergo singlet exciton fission to reveal the photophysical properties of entangled triplet-pair states. We find that the triplet pair is bound with respect to free triplets with an energy that is largely material independent (∼30 meV). During its lifetime, the component triplets behave cooperatively as a singlet and emit light through a Herzberg–Teller-type mechanism, resulting in vibronically structured photoluminescence. In photovoltaic blends, charge transfer can occur from the bound triplet pairs with >100% photon-to-charge conversion efficiency. Singlet fission in organic semiconductors can generate triplet exciton pairs that are crucial to the charge generation in a photovoltaic process, whilst their nature remains elusive. Here, Yong et al . show that the immediate triplet pair is bound and emissive in a range of acene and heteroacene materials.