Variable angle spectroscopic ellipsometry and sum-frequency vibrational spectroscopy have been used to study molecular orientations in thin films used in an organic light-emitting-diode. The films consist of sterically bulky and cross-shaped molecules that have small anisotropy in shape, 2-methyl-9,10-di(2-naphthyl)anthracene (MADN). As a result, anisotropic molecular orientation in the amorphous films has been observed with respect to the surface normal. The short axis of anthracene in MADN molecules, more or less, slightly tilts from the surface plane but preferentially close to the surface with a certain orientational distribution, while the long axis of anthracene is, on average, oriented close to the magic angle from the surface normal. This anisotropic molecular orientation gives rise to better carrier transportation properties than the isotropic orientation.
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11 March 2013
Research Article|
March 13 2013
Anisotropy in amorphous films of cross-shaped molecules with an accompanying effect on carrier mobility: Ellipsometric and sum-frequency vibrational spectroscopic studies
Masahito Oh-e;
Masahito Oh-e
a)
Materials & Energy Technology Laboratories, Sharp Co.
, 273-1 Kashiwa, Kashiwa-shi, Chiba-ken 277-0005, Japan
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Hidenori Ogata;
Hidenori Ogata
Materials & Energy Technology Laboratories, Sharp Co.
, 273-1 Kashiwa, Kashiwa-shi, Chiba-ken 277-0005, Japan
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Yoshimasa Fujita;
Yoshimasa Fujita
Materials & Energy Technology Laboratories, Sharp Co.
, 273-1 Kashiwa, Kashiwa-shi, Chiba-ken 277-0005, Japan
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Mitsuhiro Koden
Mitsuhiro Koden
Materials & Energy Technology Laboratories, Sharp Co.
, 273-1 Kashiwa, Kashiwa-shi, Chiba-ken 277-0005, Japan
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a)
Author to whom correspondence should be addressed. E-mail: [email protected] and [email protected].
Appl. Phys. Lett. 102, 101905 (2013)
Article history
Received:
December 13 2012
Accepted:
February 06 2013
Citation
Masahito Oh-e, Hidenori Ogata, Yoshimasa Fujita, Mitsuhiro Koden; Anisotropy in amorphous films of cross-shaped molecules with an accompanying effect on carrier mobility: Ellipsometric and sum-frequency vibrational spectroscopic studies. Appl. Phys. Lett. 11 March 2013; 102 (10): 101905. https://doi.org/10.1063/1.4792746
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