期刊
NATURE COMMUNICATIONS
卷 8, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms15953
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资金
- G8 Research Councils Initiative on Multilateral Research Funding [EPSRC EP/K025651]
- US National Science Foundation [CMM1-1255494]
- Japanese Society for the Promotion of Science
- University of Sheffield
- EPSRC [EP/M025330, EP/M01083X]
- BELSPO through the PAI P6/27 Functional Supramolecular Systems project
- Belgian National Fund for Scientific Research FNRS/F.R.S.
- Grants-in-Aid for Scientific Research [15K21719, 15K05374, 26105001, 26105011] Funding Source: KAKEN
- EPSRC [EP/K025651/1, EP/M01083X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K025651/1] Funding Source: researchfish
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 (similar to 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.
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