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A protocol for the fabrication of a reflective cholesteric liquid crystalline display device containing a redox-responsive chiral dopant allowing quick and low-voltage operation is presented.
We demonstrate a method for fabricating a prototype reflective display device that contains cholesteric liquid crystal (LC) as an active component. The cholesteric LC is composed of a nematic LC 4'-pentyloxy-4-cyanobiphenyl (5OCB), redox-responsive chiral dopant (FcD), and a supporting electrolyte 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMIm-OTf). The most important component is FcD. This molecule changes its helical twisting power (HTP) value in response to redox reactions. Therefore, in situ electrochemical redox reactions in the LC mixture allow for the device to change its reflection color in response to electrical stimuli. The LC mixture was introduced, by a capillary action, into a sandwich-type ITO glass cell comprising two glass slides with patterned indium tin oxide (ITO) electrodes, one of which was coated with poly(3,4-ethylenedioxythiophene)-co-poly(ethylene glycol) doped with perchlorate (PEDOT+). Upon application of +1.5 V, the reflection color of the device changed from blue (467 nm) to green (485 nm) in 0.4 s. Subsequent application of 0 V made the device recover the original blue color in 2.7 s. This device is characterized by its fastest electrical response and lowest operating voltage among any previously reported cholesteric LC device. This device could pave the way for the development of next generation reflective displays with low energy consumption rates.
Cholesteric liquid crystals (LCs) are known to exhibit bright reflection colors due to their internal helical molecular arrangements1,2,3,4. The reflection wavelength λ is determined by the helical pitch P and the average refractive index n of the LC (λ = nP). Such LCs can be generated by doping chiral compounds (chiral dopants) to nematic LCs and its helical pitch is defined by the equation P = 1/βMC, where βM is the helical twisting pow....
1. Preparation of the cholesteric LC mixture
Photographs, transmittance spectra, and time dependent transmittance change profiles at 510 nm are collected for the LC device containing FcD-doped (3.1 mol%) cholesteric LC in the presence of EMIm-OTf (3.0 mol%) during the voltage application cycles between 0 and +1.5 V at 37 °C.
The LC mixture containing FcD (3.1 mo.......
Upon application of +1.5 V to the top ITO electrode (Figure 1C), FcD undergoes an oxidation reaction to generate FcD+. As the helical twisting power of FcD+ (101 µm-1, Figure 1B) is lower than that .......
We thank Dr. Keisuke Tajima from RIKEN Center for Emergent Matter Science for valuable discussions. A part of this work was conducted at the Advanced Characterization Nanotechnology Platform of the University of Tokyo, supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. This work was financially supported by a JSPS Grant-in-Aid for Scientific Research (S) (18H05260) on "Innovative Functional Materials based on Multi-Scale Interfacial Molecular Science" for T.A. Y.I. is grateful for a JSPS Grant-in-Aid for Challenging Exploratory Research (16K14062). S.T. thanks the JSPS Young Scientist Fellowship.
....Name | Company | Catalog Number | Comments |
1-Ethyl-3-methylimidazolium Trifluoromethanesulfonate, 98% | TCI | E0494 | |
4-Cyano-4'-pentyloxybiphenyl, 98% | TCI | C1551 | |
Diamond tipped glass cutter | AS ONE | 6-539-05 | |
Dichloromethane, 99.5% | KANTO CHEMICAL | 10158-2B | HPLC grade |
Differential Scanning Calorimeter | METTLER TOLEDO | DSC 1 | |
Digital microscope | KEYENCE | VHX-5000 | |
Extran MA01 | Merck | 107555 | |
Fully ITO-coated glass plate | Costum order, Resistance: ~30Ω | ||
Glass beads | Thermo Fisher Scientific | 9005 | 5 ± 0.3 μm in diameter |
Hot stage | INSTEC | mK1000 | |
ITO-patterned glass plate | Costum order, Resistance: ~30Ω | ||
Oil rotary vacuum pump | SATO VAC | TSW-150 | Pressure: ~5 Pa |
Optical adhesive | Noland | NOA81 | |
Poly(3,4-ethylenedioxythiophene), bis-poly(ethyleneglycol), lauryl terminated | Sigma Aldrich | 687316 | 0.7 wt% (dispersion in nitromethane) |
Potentiostat | TOHO TECHNICAL RESEARCH | PS-08 | |
Rubbing machine | EHC | MRJ-100S | |
Spectrophotometer | JASCO | V-670 UV/VIS/NIR | |
Spin coater | MIKASA | 1H-D7 | |
Ultrapure water | Merck | Milli-Q Integral 3 | |
Ultrasonic bath | AS ONE | ASU-2 | Power: 40 W |
Ultrasonic soldering | KURODA TECHNO | SUNBONDER USM-IV | |
UV lamp | AS ONE | SLUV-4 | Power: 4 W |
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