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No Access Published Online: 02 August 2005

  • Raman Scattering from Organic Light Emitting Diodes

AIP Conference Proceedings 772, 1079 (2005); https://doi.org/10.1063/1.1994486
S. Guha1, M. Arif1, J. G. Keeth2, T. W. Kehl2, K. Ghosh2, and R. E. Giedd2
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  • 1Department of Physics, University of Missouri, Columbia, MO65211
  • 2Department of Physics, Astronomy & Materials Science, Southwest Missouri State University, Springfield, MO 65804
View Contributors
  • S. Guha
  • M. Arif
  • J. G. Keeth
  • T. W. Kehl
  • K. Ghosh
  • R. E. Giedd
ABSTRACT
We present Raman studies from working organic light emitting diodes (OLEDs) fabricated from a single layer of para‐hexaphenyl (PHP). The OLEDs were fabricated on patterned ITO substrates with Al cathode. The Raman intensity ratio, I1280/I1220, increases with current injection. This is interpreted in terms of a conformational change where the phenyl rings become more aromatic (benzenoid) upon charge injection. Further, capacitance vs. voltage measurements indicate the presence of interface states.
  1. © 2005 American Institute of Physics.

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