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Proceedings Paper

Miscibility and phase separation in LC semiconductor blends
Author(s): Y. Shimizu; Y. Matsuda; T. Nakao; L. Sosa-Vargas; M. Takahashi; H. Yoshida; A. Fujii; M. Ozaki
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Paper Abstract

Binary blends of phthalocyanine (Pc) LCs, 1, 4, 8, 11, 15, 18, 22, 25-octadecylphthalocyanine (C10PcH2) and the corresponding Zn complex (C10PcZn) were studied which have the identical hexagonal columnar (Colh) mesophase and the same order of carrier mobility (~ 10-1 cm2 V-1 s-1) in the mesophase. The phase diagram shows a complete miscibility in the Colh mesophase and no eutectic point was detected. The carrier mobility evaluated by Time-Of-flight (TOF) technique goes down to 10-2 cm2 V-1 s-1 in Colh phase of the initial blends prepared by solution mixing. However, the treatment of these binary systems with repetitive heating and cooling gives recovering of carrier mobility to the original level, though their HOMO and LUMO levels are slightly different in these two mesogenic Pcs. These results indicate that two types of single component column form a hexagonal array in mesophase. Also the blends with PCBM were studied on carrier mobility as well as miscibility and phase separation.

Paper Details

Date Published: 19 February 2014
PDF: 8 pages
Proc. SPIE 9004, Emerging Liquid Crystal Technologies IX, 900408 (19 February 2014); doi: 10.1117/12.2042321
Show Author Affiliations
Y. Shimizu, National Institute of Advanced Industrial Science and Technology (Japan)
Y. Matsuda, National Institute of Advanced Industrial Science and Technology (Japan)
T. Nakao, National Institute of Advanced Industrial Science and Technology (Japan)
Ryukoku Univ. (Japan)
L. Sosa-Vargas, National Institute of Advanced Industrial Science and Technology (Japan)
M. Takahashi, National Institute of Advanced Industrial Science and Technology (Japan)
H. Yoshida, Osaka Univ. (Japan)
A. Fujii, Osaka Univ. (Japan)
M. Ozaki, Osaka Univ. (Japan)


Published in SPIE Proceedings Vol. 9004:
Emerging Liquid Crystal Technologies IX
Liang-Chy Chien; Antonio M. Figueiredo Neto; Kristiaan Neyts; Masanori Ozaki, Editor(s)

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