The entangled triplet pair state in acene and heteroacene materials
| Autor: | Roland Resel, David Beljonne, Rawad K. Hallani, Henning Sirringhaus, Laura M. Herz, Munetaka Maruyama, Olga Bubnova, Andrew J. Musser, Hiroyuki Tamura, Aurélie Meneau, Jenny Clark, John E. Anthony, Steven Lukman, Shu Hotta, Sam L. Bayliss, Chaw-Keong Yong |
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| Přispěvatelé: | Sirringhaus, Henning [0000-0001-9827-6061], Apollo - University of Cambridge Repository |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Photoluminescence
Fission Science Exciton General Physics and Astronomy 02 engineering and technology Quantum entanglement 010402 general chemistry 01 natural sciences 7. Clean energy General Biochemistry Genetics and Molecular Biology Article photonic devices chemistry.chemical_compound Singlet state Acene Physics Multidisciplinary Condensed matter physics ultrafast photonics Charge (physics) General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Organic semiconductor chemistry Chemical physics solar cells 0210 nano-technology |
| Zdroj: | Nature Communications Nature Communications, Vol 8, Iss 1, Pp 1-12 (2017) |
| ISSN: | 2041-1723 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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