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%.

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.

Assembly of thioether-containing rod-like liquid crystalline materials assisted by hydrogen-bonding terminal carboxyl groups

RSC Advances ◽  
2015 ◽  
Vol 5 (11) ◽  
pp. 8056-8062 ◽  
Author(s):  
Yuki Arakawa ◽  
Sungmin Kang ◽  
Junji Watanabe ◽  
Gen-ichi Konishi
Keyword(s):  
Hydrogen Bonding ◽  
Long Range ◽  
Liquid Crystalline ◽  
Crystalline Material ◽  
Carboxyl Groups ◽  
Crystalline Materials ◽  
Liquid Crystalline Materials ◽  
Alkoxy Groups ◽  
Liquid Crystalline Material

A hydrogen-bonding-tolane-based liquid crystalline material with an alkylsulfanyl group was synthesized, which exhibited a long-range correlated mesophase compared with analogs with alkyl and alkoxy groups.

Trialkylsilylethynyl-substituted triphenylenes and hexabenzocoronenes: highly soluble liquid crystalline materials and their hole transport abilities

Tetrahedron ◽  
2015 ◽  
Vol 71 (29) ◽  
pp. 4714-4721 ◽  
Author(s):  
Takuji Hirose ◽  
Yutaro Miyazaki ◽  
Mizuki Watabe ◽  
Sho Akimoto ◽  
Tatsuya Tachikawa ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Hole Transport ◽  
Crystalline Materials ◽  
Soluble Liquid ◽  
Liquid Crystalline Materials

Novel Vitrified Liquid Crystals and Potential Applications

1996 ◽  
Vol 425 ◽  
Author(s):  
S. H. Chen ◽  
H. Shi ◽  
B. M. Conger ◽  
D. Katsis ◽  
J. C. Mastrangelo
Keyword(s):  
Thin Films ◽  
Preliminary Data ◽  
Liquid Crystalline ◽  
Molar Mass ◽  
Defect Formation ◽  
Crystalline Materials ◽  
Polarization Control ◽  
Potential Applications ◽  
Control Devices ◽  
Liquid Crystalline Materials

AbstractAn overview is presented for a generic approach to low molar mass liquid crystalline materials capable of vitrification into morphologically stable, optically anisotropic thin films. Potential applications as polarization control devices, optical notch filters, and luminescent elements will be explored. Preliminary data for defect formation and annihilation will also be presented to illustrate an advantage of low molar mass materials over polymer analogs.

On resolving fine periodic microstructures in the optical microscope

1989 ◽  
Vol 47 ◽  
pp. 364-365
Author(s):  
W.S. Putnam ◽  
C. Viney
Keyword(s):  
Liquid Crystalline ◽  
Numerical Aperture ◽  
Polarized Light ◽  
Normal Incidence ◽  
Optical Microscope ◽  
Angle Of Incidence ◽  
Resolution Limit ◽  
Crystalline Materials ◽  
Periodic Microstructures ◽  
Liquid Crystalline Materials

Many sheared liquid crystalline materials (fibers, films and moldings) exhibit a fine banded microstructure when observed in the polarized light microscope. In some cases, for example Kevlar® fiber, the periodicity is close to the resolution limit of even the highest numerical aperture objectives. The periodic microstructure reflects a non-uniform alignment of the constituent molecules, and consequently is an indication that the mechanical properties will be less than optimal. Thus it is necessary to obtain quality micrographs for characterization, which in turn requires that fine detail should contribute significantly to image formation.It is textbook knowledge that the resolution achievable with a given microscope objective (numerical aperture NA) and a given wavelength of light (λ) increases as the angle of incidence of light at the specimen surface is increased. Stated in terms of the Abbe resolution criterion, resolution improves from λ/NA to λ/2NA with increasing departure from normal incidence.

Designing Chemically Selective Liquid Crystalline Materials that Respond to Oxidizing Gases

2021 ◽  
Author(s):  
Nanqi Bao ◽  
Jake Gold ◽  
Tibor Szilvasi ◽  
Huaizhe Yu ◽  
Robert Twieg ◽  
...  
Keyword(s):  
Computational Methods ◽  
First Principles ◽  
Liquid Crystalline ◽  
Soft Materials ◽  
Crystalline Materials ◽  
Liquid Crystalline Materials ◽  
Chemically Selective ◽  
Kinetics Of

Computational methods can provide first-principles insights into the thermochemistry and kinetics of reactions at interfaces, but this capability has not been widely leveraged to design soft materials that respond selectively...

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