Polarized micro-Raman measurements of cross sections of single- and multi-layer organic films on glass substrate

Polarized Raman spectra of cross sections of an organic light emitting diode based on a small molecule have been investigated. Cross sections of single- and multi-layer organic films on glass substrates were investigated with polarized micro-Raman spectroscopy. The apparent band intensity of the cro...

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Bibliographic Details
Published in:Chemical physics letters 2009-10, Vol.481 (1), p.103-106
Main Authors: Muraki, Naoki, Yoshikawa, Masanobu
Format: Article
Language:English
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Summary:Polarized Raman spectra of cross sections of an organic light emitting diode based on a small molecule have been investigated. Cross sections of single- and multi-layer organic films on glass substrates were investigated with polarized micro-Raman spectroscopy. The apparent band intensity of the cross-sectional measurements of 200 nm-thick monolithic films increased significantly compared to surface measurements because of light propagation inside the organic films. In addition, a drastic difference appeared between the vertical Raman spectra of multi-layer organic films with and without an Al cathode. This can be explained by assuming a slab waveguide and plasmonic wave propagation. The molecular orientation of the single- and multi-layer organic films fabricated by vacuum evaporation is also discussed.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2009.09.067