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Electron Transfer Enhanced by a Minimal Energetic Driving Force at the Organic-Semiconductor Interface.
- Source :
-
Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2024 Sep 09; Vol. 63 (37), pp. e202407368. Date of Electronic Publication: 2024 Aug 12. - Publication Year :
- 2024
-
Abstract
- The energetic driving force for electron transfer must be minimized to realize efficient optoelectronic devices including organic light-emitting diodes (OLEDs) and organic photovoltaics (OPVs). Exploring the dynamics of a charge-transfer (CT) state at an interface leads to a comprehension of the relationship between energetics, electron-transfer efficiency, and device performance. Here, we investigate the electron transfer from the CT state to the triplet excited state (T <subscript>1</subscript> ) in upconversion OLEDs with 45 material combinations. By analyzing the CT emission and the singlet excited-state emission from triplet-triplet annihilation via the dark T <subscript>1</subscript> , their energetics and electron-transfer efficiencies are extracted. We demonstrate that the CT→T <subscript>1</subscript> electron transfer is enhanced by the stronger CT interaction and a minimal energetic driving force (<0.1 eV), which is explained using the Marcus theory with a small reorganization energy of <0.1 eV. Through our analysis, a novel donor-acceptor combination for the OLED is developed and shows an efficient blue emission with an extremely low turn-on voltage of 1.57 V. This work provides a solution to control interfacial CT states for efficient optoelectronic devices without energy loss.<br /> (© 2024 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1521-3773
- Volume :
- 63
- Issue :
- 37
- Database :
- MEDLINE
- Journal :
- Angewandte Chemie (International ed. in English)
- Publication Type :
- Academic Journal
- Accession number :
- 38923189
- Full Text :
- https://doi.org/10.1002/anie.202407368