TOF and TFT mobilities in polycrystalline thin films of liquid crystalline material

2008 ◽  
Author(s):  
Hiroaki Iino ◽  
Jun-ichi Hanna
Keyword(s):  
Thin Films ◽  
Liquid Crystalline ◽  
Crystalline Material ◽  
Polycrystalline Thin Films ◽  
Liquid Crystalline Material

Fabrication of polycrystalline thin films of liquid crystalline materials by solution process and its application to OFETs

2008 ◽  
Vol 1091 ◽  
Author(s):  
Hiroaki Iino ◽  
Jun-ichi Hanna
Keyword(s):  
Thin Films ◽  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Solution Process ◽  
Crystalline Material ◽  
Crystalline Materials ◽  
Polycrystalline Thin Films ◽  
Channel Performance ◽  
Liquid Crystalline Materials ◽  
Liquid Crystalline Material

AbstractWe have fabricated polycrystalline OFETs of two different liquid crystalline materials i.e., ω,ω'-dihexylquaterthipohene (6-QTP-6) and N, N'-ditridecylperylenediimide (13-Per-13) by solution process. Liquid crystalline materials help fabricating uniform thin films on the substrate when spin-coated at their temperature range of liquid crystalline phase. The FETs fabricated with 6-QTP-6 exhibited p-channel performance and its mobility was determined to be 0.04 cm2/Vs, which was comparable to that determined by time-of-flight experiments. The FETs fabricated with 13-Per-13 exhibited n-channel performance and its FET mobility was 0.008 cm2/Vs, while the mobility was increased up to 0.11 cm2/Vs after thermal annealing of the film at a liquid crystalline temperature of 220°C for an hour. Judging from these facts, the grain boundaries are controlled not so as to across the conduction channels formed by self-aligned π-conjugated aromatic cores in liquid crystalline molecules. We conclude that liquid crystalline material is a good candidate for quality polycrystalline thin films for OFETs.

Use of Glass-Forming Liquid Crystal Materials for Electroluminescent Diodes

1996 ◽  
Vol 425 ◽  
Author(s):  
T. Tsutsui ◽  
C. P. Lin ◽  
S. Saito ◽  
S. H. Chen ◽  
H. Shi ◽  
...  
Keyword(s):  
Thin Films ◽  
Liquid Crystalline ◽  
Molecular Complexes ◽  
Hole Transport ◽  
Crystalline Material ◽  
Dye Molecules ◽  
Crystalline Materials ◽  
Glass Forming ◽  
Liquid Crystalline Materials ◽  
Liquid Crystalline Material

AbstractSpin-coated thin films of cyclohexane-based liquid crystalline materials were used for the fabrication of electroluminescent diodes. Electroluminescence from single-component films of cyclohexane-based liquid crystalline materials was observed. Double component films composed of a cyclohexane-based liquid crystalline material and a conventional hole transport dye were shown to give improved electroluminescence performances, but emission was due to exciplexes composed of two components. Use of cyclohexane-based dye molecules was effective for suppressing the formation of inter-molecular complexes. The highest external quantum efficiency observed was 0.17%.

A New Liquid-Crystalline Material. Transition Metal-Poly(yne) Polymers

1979 ◽  
Vol 12 (5) ◽  
pp. 1016-1018 ◽  
Author(s):  
S. Takahashi ◽  
E. Murata ◽  
M. Kariya ◽  
K. Sonogashira ◽  
N. Hagihara
Keyword(s):  
Transition Metal ◽  
Liquid Crystalline ◽  
Crystalline Material ◽  
Liquid Crystalline Material
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