Influence of Ion Transport on Liquid Crystal Switching

James, Richard; Stojmenovik, Goran; Desimpel, Chris; Vermael, Stefaan; Fernández, FA; Day, SE; Neyts, Kristiaan

doi:10.1109/jdt.2006.879839

Cited by 19 publications

(17 citation statements)

References 9 publications

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“…Ions are inherently present in molecular liquid crystals and are the origin of their finite electrical conductivity [2,[8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Ions In Liquid Crystalsmentioning

confidence: 99%

“…In the considered example, the screening electric field compensates for the applied electric field in less than 2 s, resulting in the substantial alteration of the liquid crystal performance. An extensive discussion of the ion-related phenomena in liquid crystals are beyond the scope of this paper, and readers are referred to the original publications [9][10][11][12][13][14][15][16][17][18][19][20][21][22] and references therein] for more details. …”

Section: Ions In Liquid Crystalsmentioning

confidence: 99%

“…The methods of fabrication, uncontrollable contamination during the preparation/storage, and surfactants used to stabilize nanoparticles in liquid crystals can also decrease the effective spontaneous polarization. All these factors reduce the capability of nanoparticles to trap ions as can be seen from Equation (13). By treating thermotropic liquid crystals LC13739 [206] with ferroelectric micro-particles at the high level of loading (1 wt.…”

Section: Ferroelectric Nanoparticles In Liquid Crystalsmentioning

confidence: 99%

“…However, ions are always present in liquid crystals [2,8]. Their negative impact on the overall performance of liquid crystal devices was reported in many publications [9][10][11][12][13][14][15][16][17][18]. For example, ions in liquid crystals can cause slow response, image sticking, image flickering, the reduction of the voltage holding ratio, and color staining and non-uniformity of the image, to name a few.…”

Section: Introductionmentioning

confidence: 99%

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Nano-Objects and Ions in Liquid Crystals: Ion Trapping Effect and Related Phenomena

2015

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Abstract:The presence of ions in liquid crystals is one of the grand challenges that hinder the application of liquid crystals in various devices, which include advanced 3-D and flexible displays, tunable lenses, etc. Not only do they compromise the overall performance of liquid crystal devices, ions are also responsible for slow response, image sticking, and image flickering, as well as many other negative effects. Even highly purified liquid crystal materials can get contaminated during the manufacturing process. Moreover, liquid crystals can degrade over time and generate ions. All of these factors raise the bar for their quality control, and increase the manufacturing cost of liquid crystal products. A decade of dedicated research has paved the way to the solution of the issues mentioned above through merging liquid crystals and nanotechnology. Nano-objects (guests) that are embedded in the liquid crystals (hosts) can trap ions, which decreases the ion concentration and electrical conductivity, and improves the electro-optical response of the host. In this paper, we (i) review recently published works reporting the effects of nanoscale dopants on the electrical properties of liquid crystals; and (ii) identify the most promising inorganic and organic nanomaterials suitable to capture ions in liquid crystals.

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“…Ions are inherently present in molecular liquid crystals and are the origin of their finite electrical conductivity [2,[8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Ions In Liquid Crystalsmentioning

confidence: 99%

Section: Ions In Liquid Crystalsmentioning

confidence: 99%

Section: Ferroelectric Nanoparticles In Liquid Crystalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nano-Objects and Ions in Liquid Crystals: Ion Trapping Effect and Related Phenomena

2015

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“…It is known that the electrical conduction in liquid crystals and in particular in phthalocyanine-based materials is greatly affected by contaminants and environmental conditions [11,[28][29][30][31][32]. Although a controlled doping produces a strengthening of the sensing capability, it becomes a major limitation in organic electronics applications.…”

Section: Introductionmentioning

confidence: 99%

Doping and photo-induced current in discotic liquid crystals thin films: Long-time and temperature effects

Calò¹,

Stoliar²,

Cavallini³

et al. 2011

Organic Electronics

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. b s t r a c tHere we address the problem of time and temperature instability of the electrical current related to parasitic doping effects in discotic liquid crystals (DLCs). We investigated the electrical transport in thin films of a phthalocyanine-based DLC in-dark and upon laser irradiation during long thermal cycles. Measuring the electrical transport between two electrodes we observed that in-dark the current is mostly due to doping levels while, upon laser irradiation, the photocurrent reflects the diffusion length of the photogenerated charge carriers and it is limited by the coherence length of a column. We prove here that the two contributions are completely independent. Our result experimentally supports the theoretical studies performed at the molecular level on discotic liquid crystals.

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Ion Transport in Liquid Crystals

Neyts

Beunis

2014

Handbook of Liquid Crystals

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Influence of Ion Transport on Liquid Crystal Switching

Cited by 19 publications

References 9 publications

Nano-Objects and Ions in Liquid Crystals: Ion Trapping Effect and Related Phenomena

Nano-Objects and Ions in Liquid Crystals: Ion Trapping Effect and Related Phenomena

Doping and photo-induced current in discotic liquid crystals thin films: Long-time and temperature effects

Ion Transport in Liquid Crystals

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