Gruenbaum, Tobias and Milster, Sebastian and Kraus, Hermann and Ratzke, Wolfram and Kurrmann, Simon and Zeller, Viola and Bange, Sebastian and Boehme, Christoph and Lupton, John M. (2020) OLEDs as models for bird magnetoception: detecting electron spin resonance in geomagnetic fields. FARADAY DISCUSSIONS, 221. pp. 92-109. ISSN 1359-6640, 1364-5498
Full text not available from this repository. (Request a copy)Abstract
Certain species of living creatures are known to orientate themselves in the geomagnetic field. Given the small magnitude of approximately 48 mu T, the underlying quantum mechanical phenomena are expected to exhibit coherence times in the microsecond regime. In this contribution, we show the sensitivity of organic light-emitting diodes (OLEDs) to magnetic fields far below Earth's magnetic field, suggesting that coherence times of the spins of charge-carrier pairs in these devices can be similarly long. By electron paramagnetic resonance (EPR) experiments, a lower bound for the coherence time can be assessed directly. Moreover, this technique offers the possibility to determine the distribution of hyperfine fields within the organic semiconductor layer. We extend this technique to a material system exhibiting both fluorescence and phosphorescence, demonstrating stable anticorrelation between optically detected magnetic resonance (ODMR) spectra in the singlet (fluorescence) and triplet (phosphorescence) channels. The experiments demonstrate the extreme sensitivity of OLEDs to both static as well as dynamic magnetic fields and suggest that coherent spin precession processes of coulombically bound electron-spin pairs may play a crucial role in the magnetoreceptive ability of living creatures.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | RADICAL-PAIR MECHANISM; MAGNETIC-FIELD; ROOM-TEMPERATURE; TRIPLET EMITTERS; MAGNETORESISTANCE; KINETICS; DEVICES; MOTION; FILMS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 08 Apr 2021 09:26 |
| Last Modified: | 08 Apr 2021 09:26 |
| URI: | https://pred.uni-regensburg.de/id/eprint/45545 |
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