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Dielectric control of reverse intersystem crossing in thermally activated delayed fluorescence emitters.

التفاصيل البيبلوغرافية
العنوان: Dielectric control of reverse intersystem crossing in thermally activated delayed fluorescence emitters.
المؤلفون: Gillett AJ; Cavendish Laboratory, University of Cambridge, Cambridge, UK. ajg216@cam.ac.uk., Pershin A; Laboratory for Chemistry of Novel Materials, Université de Mons, Mons, Belgium.; Wigner Research Centre for Physics, Budapest, Hungary., Pandya R; Cavendish Laboratory, University of Cambridge, Cambridge, UK., Feldmann S; Cavendish Laboratory, University of Cambridge, Cambridge, UK., Sneyd AJ; Cavendish Laboratory, University of Cambridge, Cambridge, UK., Alvertis AM; Cavendish Laboratory, University of Cambridge, Cambridge, UK., Evans EW; Cavendish Laboratory, University of Cambridge, Cambridge, UK.; Department of Chemistry, Swansea University, Swansea, UK., Thomas TH; Cavendish Laboratory, University of Cambridge, Cambridge, UK., Cui LS; CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, China., Drummond BH; Cavendish Laboratory, University of Cambridge, Cambridge, UK., Scholes GD; Department of Chemistry, Princeton University, Princeton, NJ, USA., Olivier Y; Unité de Chimie Physique Théorique et Structurale & Laboratoire de Physique du Solide, Namur Institute of Structured Matter, Université de Namur, Namur, Belgium., Rao A; Cavendish Laboratory, University of Cambridge, Cambridge, UK., Friend RH; Cavendish Laboratory, University of Cambridge, Cambridge, UK., Beljonne D; Laboratory for Chemistry of Novel Materials, Université de Mons, Mons, Belgium. david.beljonne@umons.ac.be.
المصدر: Nature materials [Nat Mater] 2022 Oct; Vol. 21 (10), pp. 1150-1157. Date of Electronic Publication: 2022 Aug 04.
نوع المنشور: Journal Article; Research Support, Non-U.S. Gov't
اللغة: English
بيانات الدورية: Publisher: Nature Pub. Group Country of Publication: England NLM ID: 101155473 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1476-4660 (Electronic) Linking ISSN: 14761122 NLM ISO Abbreviation: Nat Mater Subsets: MEDLINE
أسماء مطبوعة: Original Publication: London, UK : Nature Pub. Group, [2002]-
مواضيع طبية MeSH: Semiconductors*, Fluorescence
مستخلص: Thermally activated delayed fluorescence enables organic semiconductors with charge transfer-type excitons to convert dark triplet states into bright singlets via reverse intersystem crossing. However, thus far, the contribution from the dielectric environment has received insufficient attention. Here we study the role of the dielectric environment in a range of thermally activated delayed fluorescence materials with varying changes in dipole moment upon optical excitation. In dipolar emitters, we observe how environmental reorganization after excitation triggers the full charge transfer exciton formation, minimizing the singlet-triplet energy gap, with the emergence of two (reactant-inactive) modes acting as a vibrational fingerprint of the charge transfer product. In contrast, the dielectric environment plays a smaller role in less dipolar materials. The analysis of energy-time trajectories and their free-energy functions reveals that the dielectric environment substantially reduces the activation energy for reverse intersystem crossing in dipolar thermally activated delayed fluorescence emitters, increasing the reverse intersystem crossing rate by three orders of magnitude versus the isolated molecule.
(© 2022. The Author(s), under exclusive licence to Springer Nature Limited.)
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معلومات مُعتمدة: 758826 International ERC_ European Research Council; 670405 International ERC_ European Research Council
تواريخ الأحداث: Date Created: 20220804 Date Completed: 20220930 Latest Revision: 20230205
رمز التحديث: 20231215
مُعرف محوري في PubMed: PMC7613666
DOI: 10.1038/s41563-022-01321-2
PMID: 35927434
قاعدة البيانات: MEDLINE
الوصف
تدمد:1476-4660
DOI:10.1038/s41563-022-01321-2