Polymer-dispersed liquid crystal devices using highly conducting polymers as electrodes

Kim, Jin‐Yeol; Woo, Hak-Yong; Baek, Ji-Woong; Kim, Tae-Wook; Song, Eun-Ah; Park, Su-Cheol; Ihm, Dae-Woo

doi:10.1063/1.2905277

Cited by 32 publications

(13 citation statements)

References 21 publications

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“…However, ITO films are not applicable to flexible OLEDs because they are brittle. Therefore, many substitutable electrodes have been investigated to replace ITO films such as carbon nanotubes, graphene, conductive polymers, and metal‐based electrodes . Among the alternatives, metal‐based electrodes are a strong candidate due to their superior electrical and optical transmittance.…”

Section: Introductionmentioning

confidence: 99%

Junction‐Free Electrospun Ag Fiber Electrodes for Flexible Organic Light‐Emitting Diodes

Choi

Shim

Park

et al. 2017

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Fabrication of junction-free Ag fiber electrodes for flexible organic light-emitting diodes (OLEDs) is demonstrated. The junction-free Ag fiber electrodes are fabricated by electrospun polymer fibers used as an etch mask and wet etching of Ag thin film. This process facilitates surface roughness control, which is important in transparent electrodes based on metal wires to prevent electrical instability of the OLEDs. The transmittance and resistance of Ag fiber electrodes can be independently adjusted by controlling spinning time and Ag deposition thickness. The Ag fiber electrode shows a transmittance of 91.8% (at 550 nm) at a sheet resistance of 22.3 Ω □ , leading to the highest OLED efficiency. In addition, Ag fiber electrodes exhibit excellent mechanical durability, as shown by measuring the change in resistance under repeatable mechanical bending and various bending radii. The OLEDs with Ag fiber electrodes on a flexible substrate are successfully fabricated, and the OLEDs show an enhancement of EQE (≈19%) compared to commercial indium tin oxide electrodes.

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Section: Introductionmentioning

confidence: 99%

Junction‐Free Electrospun Ag Fiber Electrodes for Flexible Organic Light‐Emitting Diodes

Choi

Shim

Park

et al. 2017

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“…In the past decades, many works have been done to improve the EO properties of PDLCs. [8][9][10][11] However, PDLCs with excellent EO parameters are still hard to obtain currently. Consequently, the development of PDLCs is still retarded.…”

Section: Introductionmentioning

confidence: 99%

Effect of rGO on polymer-dispersed liquid crystal fabricated by RAFT polymerisation

Zhang

Shao

et al. 2015

Liquid Crystals

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In this study, we demonstrated that doping polymer matrix with a small amount of reduced graphene oxide (rGO) component (0.05-0.2%) had significant influence on the polymerisation kinetics and electro-optical performances of polymer-dispersed liquid crystal films (PDLCs) fabricated with macro reversible addition-fragmentation chain transfer agents. The effects of rGO content were studied in terms of morphology, compound viscosity, polymer conductivity, polymerisation kinetics and driving voltage of PDLCs. The results exhibited that higher rGO content increased the compound viscosity and the entire process proceeded slowly. Furthermore, the addition of rGO increased the polymer conductivity and local electric field, and reduced the saturation voltage as well as the threshold voltage from 27.3 to 19.5 V and 13.2 to 6.41 V, respectively.

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“…In the monomer EDOT, thiophene ring is protected at 3 and 4 position by ethylene‐dioxy moiety, reducing the possibility of side chain reaction during polymerization, which leads to enhancement in conjugation length of the resulting polymer chain of PEDOT 9. The doped PEDOT samples have been used in electrochromic devices 10–13, electromagnetic shielding 14, transparent conducting electrodes 15–19, active layer for semiconducting memory devices 20, hole transport materials for organic light emitting diodes 21, liquid crystal displays 22 and solar cells 23. An overview of the early development of PEDOT, synthesis of its hybrid and derivative materials, broad array of its properties and some prominent applications was published by Reynolds' group 2.…”

Section: Introductionmentioning

confidence: 99%

Irradiation induced crossover from 1D to 3D transport behaviors of PEDOT‐titanium dioxide hybrid nanocomposites

Sarmah¹,

Kumar²

2012

Physica Status Solidi (a)

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Conductive poly(3,4‐ethylenedioxythiophene)/TiO2 nanocomposites were synthesized via a facile oxidative polymerization approach using dodecylbenzene sulfonic acid as a dopant and ammonium peroxydisulfate as an oxidant and irradiated with 90 MeV O7+ ions at the fluences of 5 × 1010, 1 × 1011, 5 × 1011, and 1 × 1012 ions cm−2 using 15UD Pelletron accelerator under high vacuum. X‐ray diffraction studies show that microstrain and domain crystallite size of the nanocomposites increases with the increase of ion fluence resulting in highly ordered PEDOT‐TiO2 nanocomposites. Thermogravimmetric analysis shows that the thermal stability of the nanocomposites increases with the increase of irradiation fluences which can be attributed to the crosslinking of polymer chains due to high electronic energy deposition. Scanning electron micrographs show that there is grain growth after swift heavy ion (SHI) irradiation resulting highly dense and less porous microstructure of nanocomposite films. DC conductivity of unirradiated nanocomposites exhibits Mott's 1D variable range hopping (VRH) mechanism. However, there is cross over to 3D VRH mechanism at higher irradiation fluence of 5 × 1011 and 1 × 1012 ions cm−2. There is an enhancement in the electrical conductivity of the nanocomposites upon SHI irradiation correlating crosslinking with DC conductivity of the nanocomposites.

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Polymer-dispersed liquid crystal devices using highly conducting polymers as electrodes

Cited by 32 publications

References 21 publications

Junction‐Free Electrospun Ag Fiber Electrodes for Flexible Organic Light‐Emitting Diodes

Junction‐Free Electrospun Ag Fiber Electrodes for Flexible Organic Light‐Emitting Diodes

Effect of rGO on polymer-dispersed liquid crystal fabricated by RAFT polymerisation

Irradiation induced crossover from 1D to 3D transport behaviors of PEDOT‐titanium dioxide hybrid nanocomposites

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