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Coherent and incoherent spin-relaxation dynamics of electron-hole pairs in a π -conjugated polymer at low magnetic fields
Tennahewa, T. H., Hosseinzadeh, S., Atwood, S. I., Popli, H., Malissa, H.
, Lupton, John M. and Boehme, C.
(2024)
Coherent and incoherent spin-relaxation dynamics of electron-hole pairs in a π -conjugated polymer at low magnetic fields.
Physical Review B 109 (7).
Date of publication of this fulltext: 11 Mar 2025 15:09
Article
DOI to cite this document: 10.5283/epub.75221
Abstract
We report room-temperature measurements of the spin-relaxation times T1 and T2 of electron-hole chargecarrier spins in an organic light-emitting diode based on the π-conjugated polymer SY-PPV at low (1mT � B0 � 10mT) static magnetic fields, using electrically detected—through spin-Rabi oscillation-controlled recombination currents—magnetic resonant Hahn-echo and inversion-recovery pulse ...
We report room-temperature measurements of the spin-relaxation times T1 and T2 of electron-hole chargecarrier
spins in an organic light-emitting diode based on the π-conjugated polymer SY-PPV at low (1mT �
B0 � 10mT) static magnetic fields, using electrically detected—through spin-Rabi oscillation-controlled recombination
currents—magnetic resonant Hahn-echo and inversion-recovery pulse sequences. When random local
hyperfine fields and external magnetic fields compete in magnitude, charge carrier spin-quantization axes are no
longer well defined, and striking magnetic-field dependencies of spin-lattice relaxation times are found, while
spin coherence times remain mostly field-independent. These results corroborate the magnetic-field sensitivities
of observables governed by radical-pair physics.
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| Item type | Article | ||||
| Journal or Publication Title | Physical Review B | ||||
| Publisher: | APS | ||||
|---|---|---|---|---|---|
| Open Access Type: | Other | ||||
| Volume: | 109 | ||||
| Number of Issue or Book Chapter: | 7 | ||||
| Date | 12 February 2024 | ||||
| Institutions | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton | ||||
| Projects |
Funded by:
Deutsche Forschungsgemeinschaft (DFG)
(314695032)
| ||||
| Identification Number |
| ||||
| Keywords | Spin dynamics; Spin relaxation; Organic LEDs; Organic semiconductors; Polymer thin films; Electron spin resonance; Resistivity measurements | ||||
| Dewey Decimal Classification | 500 Science > 530 Physics | ||||
| Status | Published | ||||
| Refereed | Yes, this version has been refereed | ||||
| Created at the University of Regensburg | Yes | ||||
| URN of the UB Regensburg | urn:nbn:de:bvb:355-epub-752213 | ||||
| Item ID | 75221 |
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