Energy Transport Singlet to Triplet and Back Again

• Published: 22 September 2015

Energy transport

Singlet to triplet and back once again

Nature Chemistry volume 7,pages 764–765 (2015)Cite this commodity

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Spin-triplet excitations ordinarily migrate through direct electron exchange between neighbouring molecules. At present, experiments show that dorsum-and-forth interconversion betwixt spin-triplet and spin-singlet states can significantly speed up triplet migration in organic crystals.

The absorption of visible light past a molecule typically creates an excited electronic land that will later on relax through one of a number of potential pathways, be it through the emission of a photon or by transferring its energy to its surroundings as heat. However, in some cases an electron tin can relax by using some, but not all, of its energy to excite a 2d electron on a neighbouring molecule. In materials that possess low-free energy triplet levels, such as some extended polycyclic aromatic hydrocarbons and long-chain polyenes, information technology is possible for high-energy singlet excitons (excited electron–hole pairs) to relax by generating a pair of spin-correlated triplet excitons. This process, known as singlet fission^ane, was start reported in the mid 1960s but has found renewed interest considering information technology could potentially boost solar prison cell photocurrents by generating more than i excited electron from a single photon^two. However, building devices that benefit from singlet fission requires an understanding of how these materials transport energy. Now, writing in Nature Chemistry, Huang and colleaguesⁱⁱⁱ have discovered that careful balancing of the singlet and triplet energies of singlet-fission materials can exist used to significantly enhance the rate with which these materials move energy.

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Figure ane: Analogy showing how femtosecond microscopy experiments track cooperative free energy transport in tetracene crystals.

References

1. Smith, M. B. & Michl, J. Chem. Rev. 110, 6891–6936 (2010).

   CAS  Article  Google Scholar

2. Hanna, M. C. & Nozik, A. J. J. Appl. Phys. 100, 74510 (2006).

   Commodity  Google Scholar

3. Wan, Y. et al. Nature Chem. 7, 785–792 (2015).

   CAS  Commodity  Google Scholar

4. Förster, T. Ann. Phys. six, 55–75 (1938).

   Google Scholar

5. Dexter, D. 50. J. Chem. Phys. 21, 836 (1953).

   CAS  Commodity  Google Scholar

6. Köhler, A. & Bässler, H. Mater. Sci. Eng. R Rep. 66, 71–109 (2009).

   Article  Google Scholar

7. Akselrod, G. M. et al. Nature Commun. 5, 3646 (2014).

   CAS  Article  Google Scholar

8. Yost, S. R. et al. Nature Chem. 6, 492–497 (2014).

   CAS  Commodity  Google Scholar

Download references

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1. Sean T. Roberts is in the Department of Chemistry, Academy of Texas at Austin, 105 24th Street Cease A5300, Austin, Texas 78712, USA

   Sean T. Roberts

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Correspondence to Sean T. Roberts.

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Roberts, Southward. Singlet to triplet and back again. Nature Chem 7, 764–765 (2015). https://doi.org/10.1038/nchem.2356

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• Published: 22 September 2015

• Effect Appointment: October 2015

• DOI : https://doi.org/10.1038/nchem.2356

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