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Updated: Apr 23, 2026
07:44
Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
Published on: November 16, 2018
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Organic electronics. Room-temperature coupling between electrical current and nuclear spins in OLEDs.
H Malissa1, M Kavand2, D P Waters2
1Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112, USA. hmalissa@physics.utah.edu john.lupton@ur.de boehme@physics.utah.edu.
Science (New York, N.Y.)
|September 20, 2014
Summary
Researchers directly measured spin coupling in organic semiconductors using pulsed nuclear magnetic resonance in diodes. This allows for precise control of electrical current via nuclear spin orientation.
Area of Science:
- Solid-state physics
- Organic electronics
- Quantum chemistry
Background:
- External magnetic fields influence organic semiconductor conductivity via charge carrier and nuclear spin hyperfine coupling.
- Understanding this coupling is crucial for advanced electronic device applications.
Purpose of the Study:
- To directly investigate the hyperfine coupling between charge carriers and hydrogen nuclei in organic semiconductors.
- To demonstrate resonant control of electrical current using nuclear spin orientation.
Main Methods:
- Implementation of pulsed electrically detected nuclear magnetic resonance (EDNMR) spectroscopy.
- Utilizing organic light-emitting diodes (OLEDs) as the experimental platform.
- Employing a double-resonance scheme with radiofrequency pulses.
Main Results:
- EDNMR revealed isotope-specific fingerprints (protium vs. deuterium) in spin-echo envelope modulation.
- Achieved resonant control of electric current by manipulating nuclear spin orientation.
- Demonstrated current modulation at extremely low energy scales (10^-6 times thermal energy).
Conclusions:
- Directly confirmed the role of hyperfine coupling in magnetic field effects on organic semiconductors.
- Established a method for precise electrical current control via nuclear spin manipulation.
- Opened avenues for novel spintronic devices with unprecedented energy efficiency.
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