Magnetic Characterization of Organic Materials
Technical Report,10 Sep 2015,09 Sep 2016
YONSEI UNIVERSITY UNIVERSITY-INDUSTRY FOUNDATION Seoul Korea, South
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Organic materials show interesting phenomena called magnetic field effects MFEs, modulating their photophysical and electrical properties such as resistance and electrophotoluminescence by external magnetic fields. These phenomena can be applied to magneto-optic or magneto-electric devices allowing functional control of organic devices OLED, OPV, OFET with applied magnetic field. This project involved investigation of MFEs on the behaviors of chargespin carriers in organic materials, such as charge mobilities, charge transfer, trapping, charge separation and recombination by magnetic field applied spectroscopic methodologies. Recently, magnetic phenomena of organic materials have been extensively studied for both fundamental and technological reasons. Especially, organic materials show the distinctive features that low magnetic field, below approximately 100 mT, affects their electrical and photophysical properties, which has not been observed in conventional magnetic materials. These features can be applied to various organic devices OLED, OPV, OFET, which allows us to magnetically modulate their properties, such as quantum yields, diffusion lengths, and charge mobilities. In this context, a detailed understanding of magnetic features is crucial to develop novel magneto-optic or magneto-electric organic devices. This project focused on exploring magnetic field dependent photophysical properties, such as magneto-photoluminescence MPL, magneto-photo induced absorbance MPA and their time dependent features. As the photophysical data represent the transition and population of chargespin carriers at specific energy levels, the carrier dynamics under magnetic field can be elucidated by spectroscopic measurements.
- Electricity and Magnetism