Accession Number : AD1026794

Title :   Magnetic Characterization of Organic Materials

Descriptive Note : Technical Report,10 Sep 2015,09 Sep 2016


Personal Author(s) : Kim, Dongho

Full Text :

Report Date : 12 Dec 2016

Pagination or Media Count : 17

Abstract : Organic materials show interesting phenomena called magnetic field effects (MFEs), modulating their photophysical and electrical properties such as resistance and electro/photoluminescence 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 charge/spin 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 charge/spin carriers at specific energy levels, the carrier dynamics under magnetic field can be elucidated by spectroscopic measurements.

Descriptors :   magnetic properties , magnetic fields , optical properties , spectroscopy , organic materials

Subject Categories : Optics
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE