Perdeuteration of poly[2-methoxy-5-(2'- ethylhexyloxy)-1,4-phenylenevinylene] (d-MEH-PPV): control of microscopic charge-carrier spin–spin coupling and of magnetic-field effects in optoelectronic devices

DOI to cite this document:

10.5283/epub.41666 Copy

Stoltzfus, Dani M. ; Joshi, Gajadhar ; Popli, Henna ; Jamali, Shirin ; Kavand, Marzieh ; Milster, Sebastian ; Grünbaum, Tobias ; Bange, Sebastian ; Nahlawi, Adnan ; Teferi, Mandefro Y. ; Atwood, Sabastian I. ; Leung, Anna E. ; Darwish, Tamim A. ; Malissa, Hans ; Burn, Paul L. ; Lupton, John M. ; Boehme, Christoph

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Date of publication of this fulltext: 02 Mar 2020 09:49

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Details

Item type:	Article
Journal or Publication Title:	Journal of Materials Chemistry C
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
Volume:	8
Page Range:	pp. 2764-2771
Date:	21 January 2020
Institutions:	Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton
Identification Number:	Value Type 10.1039/c9tc05322k DOI
Keywords:	ROOM-TEMPERATURE;
Dewey Decimal Classification:	500 Science > 530 Physics
Status:	Published
Refereed:	Yes, this version has been refereed
Created at the University of Regensburg:	Partially
Item ID:	41666

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Abstract

Control of the effective local hyperfine fields in a conjugated polymer, poly[2-methoxy-5-(2 '-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), by isotopic engineering is reported. These fields, evident as a frequency-independent line broadening mechanism in electrically detected magnetic resonance (EDMR) spectroscopy, originate from the unresolved hyperfine coupling between the electronic spin ...

Abstract

Control of the effective local hyperfine fields in a conjugated polymer, poly[2-methoxy-5-(2 '-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), by isotopic engineering is reported. These fields, evident as a frequency-independent line broadening mechanism in electrically detected magnetic resonance (EDMR) spectroscopy, originate from the unresolved hyperfine coupling between the electronic spin of charge carrier pairs and the nuclear spins of surrounding hydrogen isotopes. The room temperature study of effects caused by complete deuteration of this polymer through magnetoresistance, magnetoelectroluminescence, coherent pulsed and multi-frequency EDMR, as well as inverse spin-Hall effect measurements, confirm the weak hyperfine broadening of charge-carrier magnetic resonance lines. As a consequence, we can resolve coherent charge-carrier spin-beating, allowing for direct measurements of the magnitude of electronic spin-spin interactions. In addition, the weak hyperfine coupling allows us to resolve substantial spin-orbit coupling effects in the EDMR spectra, even at low magnetic field strengths. These results illustrate the dramatic influence of hyperfine fields on the spin physics of organic light-emitting diode (OLED) materials at room temperature, and point to routes to reaching exotic ultra-strong resonant-drive regimes in the study of light-matter interactions.

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Metadata last modified: 29 Sep 2021 07:41

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