Liquid crystals as a self-organizing molecular semiconductors

Recently is has been discovered that some types of liquid crystals exhibit very fast electronic conduction whose charge carrier transport are characterized by high mobility over 10-2 cm2/Vs independent of electric field and temperature. Now, the liquid crystals are being recognized as a new class of organic semiconductors, in addition to the recognition as the display material. The liquid crystal enjoys superior properties to conventional amorphous materials in terms of the organic semiconductors for large-area devices, thanks to its liquid-like fluidity and crystal-like molecular alignment. In this articles, a new aspect of liquid crystals as a Self-organizing molecular semiconductors are reviewed on the basis of our experimental results on smectic liquid crystals and discuss their high potential for organic electronic devices.

[1]  Jun-ichi Hanna,et al.  Effect of Domain Boundary on Carrier Transport of Calamitic Liquid Crystalline Photoconductive Materials , 2000 .

[2]  Jun-ichi Hanna,et al.  Fast ambipolar carrier transport in smectic phases of phenylnaphthalene liquid crystal , 1997 .

[3]  Siegmar Diele,et al.  Bipolar carrier transport in a lamello-columnar mesophase of a sanidic liquid crystal , 2002 .

[4]  Grzegorz Derfel,et al.  Charge Carrier Mobility Measurements in Nematic Liquid Crystals , 1979 .

[5]  Adam,et al.  Transient photoconductivity in a discotic liquid crystal. , 1993, Physical review letters.

[6]  P. Schuhmacher,et al.  Fast photoconduction in the highly ordered columnar phase of a discotic liquid crystal , 1994, Nature.

[7]  John M. Warman,et al.  Record Charge Carrier Mobility in a Room‐Temperature Discotic Liquid‐Crystalline Derivative of Hexabenzocoronene , 1999 .

[8]  Masanori Ozaki,et al.  Organic electroluminescent diodes as a light source for polymeric integrated devices , 2001, SPIE OPTO.

[9]  R. Bushby,et al.  Mechanism of charge transport in discotic liquid crystals. , 1995, Physical review. B, Condensed matter.

[10]  E. Sudhölter,et al.  Liquid Crystalline Perylene diimides : Architecture and Charge Carrier Mobilities , 2000 .

[11]  Jun-ichi Hanna,et al.  Microsecond photoresponse in liquid crystalline photoconductor doped with C70 under illumination of visible light , 1999 .

[12]  Donal D. C. Bradley,et al.  Nondispersive hole transport in an electroluminescent polyfluorene , 1998 .

[13]  Masahiro Funahashi,et al.  First Electronic Conduction with High Hole Mobility in Smectic a Phase of a Calamitic Liquld Crystal , 1997 .

[14]  Paul M. Borsenberger,et al.  Organic photoreceptors for xerography , 1998 .

[15]  Jun-ichi Hanna,et al.  FAST HOLE TRANSPORT IN A NEW CALAMITIC LIQUID CRYSTAL OF 2-(4'-HEPTYLOXYPHENYL)-6-DODECYLTHIOBENZOTHIAZOLE , 1997 .

[16]  Jun-ichi Hanna,et al.  New Aspects of Organic Electric Materials in Calamitic Liquid Crystalline Photoconductors , 1999 .

[17]  Graham Williams,et al.  One-dimensional electronic conductivity in discotic liquid crystals , 1988 .