Organic Light-Emitting Diode with Highly Ordered Polycrystalline Thin Film

We investigate organic light-emitting diodes with a polycrystalline thin film of a calamitic liquid-crystalline material. Compared to a non-liquid-crystalline material, the polycrystalline films fabricated via the liquid-crystalline phase showed high electrical current and light emission from an emi...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2013-05, Vol.52 (5), p.05DC14-05DC14-5
Main Authors: Nakano, Kyohei, Kobori, Takeo, Takayashiki, Yukiko, Iino, Hiroaki, Hanna, Jun-ichi
Format: Article
Language:English
Subjects:
Diffraction patterns
Film thickness
Grain boundaries
Light emission
Optical microscopes
Organic light-emitting diodes
Orientation
Thin films
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Summary:We investigate organic light-emitting diodes with a polycrystalline thin film of a calamitic liquid-crystalline material. Compared to a non-liquid-crystalline material, the polycrystalline films fabricated via the liquid-crystalline phase showed high electrical current and light emission from an emissive dye dopant, in spite of a film thickness of over 1 μm. Judging from the X-ray diffraction patterns and polarized optical microscope images, well-controlled parallel molecular orientation and suppression of grain boundaries were achieved only in the liquid-crystalline material owing to the molecular orientation controllability of the liquid-crystalline materials. We conclude that the liquid-crystalline materials can be a good candidate for a polycrystalline organic semiconductor for not only thin-film transistors but also light-emitting diodes and solar cells.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.52.05DC14