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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/4162

Title: Excellent uniaxial alignment of poly(9,9-dioctylfluorenyl-2,7-diyl) induced by photoaligned polyimide films
Authors: Sakamoto, Kenji
Usami, Kiyoaki
Uehara, Yoichi
Ushioda, Sukekatsu
Issue Date: 2005-11-17
Magazine name: Applied Physics Letters
Volume: 87
Number: 21
Start page: 211910-1
End page: 211910-3
DOI: 10.1063/1.2135873
Abstract: We have investigated the alignment of poly (9,9-dioctylfluorenyl-2,7-diyl) (PFO) induced by photoaligned polyimide films. To induce anisotropic orientation of polyimide backbone structures by optical treatment, we used a specially designed polyimide (Azo-PI), which contains azobenzene in the backbone structure. The 30-nm-thick PFO layer, spincoated onto a photoaligned Azo-PI film, was heated to the liquid crystalline phase of PFO, and then cooled down to room temperature at -0.1 ℃/min. The thermally treated PFO layer showed a polarization ratio of approximately 30 in photoluminescence. This high polarization ratio has not previously been reported in PFO films formed by other alignment techniques. This result indicates that the photoaligned Azo-PI film has an excellent ability to align liquid crystalline polymers.
Rights: Copyright 2005 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Sakamoto, K., Usami, K., Uehara, Y., Ushioda, S., Applied Physics Letters 87(21), 211910 (2005) and may be found at http://link.aip.org/link/?APPLAB/87/211910/1 .
URI: http://hdl.handle.net/10119/4162
Material Type: publisher
Appears in Collections:i10-1. 雑誌掲載論文 (Journal Articles)

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