Electrochromism of a bipolar reversible redox-active ferrocene–viologen linked ionic liquid

Tahara, Hironobu; Baba, Rei; Iwanaga, Kodai; Sagara, Takamasa; Murakami, Hiroto

doi:10.1039/c6cc09412k

Cited by 53 publications

(31 citation statements)

References 34 publications

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“…The representative device based on electrochemistry is an electrochromic (EC) device. EC devices that exhibit reversible color changes by modification of optical properties based on oxidation states have been developed for diverse applications including smart windows, large‐area signage, mirrors, light‐shutters, military equipment camouflage, and reflective displays . In general, EC devices are classified into three forms: type I, type II, and type III, according to the solubility of the redox species in the electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Flexible and Transparent Electrochromic Displays with Simultaneously Implementable Subpixelated Ion Gel‐Based Viologens by Multiple Patterning

Kim

Myoung

2019

Adv Funct Materials

124

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Electrochromic materials reversibly change colors by redox reactions depending on the oxidation states. To utilize electrochromic materials for active-matrix display applications, an electrochromic display (ECD) requires simultaneous implementation of various colors and a fine-pixelation process. Herein, flexible and transparent ECDs with simultaneously implementable subpixelated EC gels by sequential multiple patterning are successfully demonstrated. Ionic liquid-based EC gels of monoheptyl-viologen, diheptylviologen (DHV), and diphenyl-viologen (DPV) are used to create the colors of ECDs: magenta, blue, and green, respectively. Especially, to realize an improved green color, DHV-DPV composite gels are synthesized. Three EC gels exhibit stable properties without degradation during repetitive operation. Moreover, a transmittance greater than 90% is maintained in a bleached state, which is sufficient for application as a transparent display. The subpixelation process for multicolored-flexible ECDs is designed to facilitate both easy fabrication and rapid operation with various patterns at low cost. The subpixelated EC gels using a film mask can be implemented to a minimum size of 200 µm. Furthermore, the subpixelated flexible ECDs exhibit high durability even after 1000 cycles of mechanical bending tests at a bending radius of 10 mm. Therefore, these EC materials can be used directly for flexible and transparent active-matrix displays.

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Section: Introductionmentioning

confidence: 99%

Flexible and Transparent Electrochromic Displays with Simultaneously Implementable Subpixelated Ion Gel‐Based Viologens by Multiple Patterning

Kim

Myoung

2019

Adv Funct Materials

124

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“…There are various EC materials: transition metal oxides [19][20][21] such as WO 3 , 22-24 metal hexacyanoferrate (MHCF) complexes, [25][26][27] metal hydrides, 9,10 and organic polymers. [28][29][30][31][32][33] Among the EC materials, tungsten oxide, WO 3 , is a key material. The WO 3 -based ECD shows blue-bleached switching.…”

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confidence: 99%

Green fabrication of a complementary electrochromic device using water-based ink containing nanoparticles of WO₃ and Prussian blue

et al. 2020

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“…Conversely, assembling solid electrolytes with rigid electrode substrates is very difficult due to their nondeformability. This may limit the electronic contact between the electrode substrates and the EC material [ 125 ], leading to colorless areas in the colored state, making it more noticeable in the case of large-area ECDs.…”

Section: Processability Of All-in-one Gel-based Ecdsmentioning

confidence: 99%

All-in-One Gel-Based Electrochromic Devices: Strengths and Recent Developments

et al. 2018

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Electrochromic devices (ECDs) have aroused great interest because of their potential applicability in displays and smart systems, including windows, rearview mirrors, and helmet visors. In the last decades, different device structures and materials have been proposed to meet the requirements of commercial applications to boost market entry. To this end, employing simple device architectures and achieving a competitive electrolyte are crucial to accomplish easily implementable, high-performance ECDs. The present review outlines devices comprising gel electrolytes as a single electroactive layer (“all-in-one”) ECD architecture, highlighting some advantages and opportunities they offer over other electrochromic systems. In this context, gel electrolytes not only overcome the drawbacks of liquid and solid electrolytes, such as liquid’s low chemical stability and risk of leaking and soil’s slow switching and lack of transparency, but also exhibit further strengths. These include easier processability, suitability for flexible substrates, and improved stabilization of the chemical species involved in redox processes, leading to better cyclability and opening wide possibilities to extend the electrochromic color palette, as discussed herein. Finally, conclusions and outlook are provided.

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Electrochromism of a bipolar reversible redox-active ferrocene–viologen linked ionic liquid

Cited by 53 publications

References 34 publications

Flexible and Transparent Electrochromic Displays with Simultaneously Implementable Subpixelated Ion Gel‐Based Viologens by Multiple Patterning

Flexible and Transparent Electrochromic Displays with Simultaneously Implementable Subpixelated Ion Gel‐Based Viologens by Multiple Patterning

Green fabrication of a complementary electrochromic device using water-based ink containing nanoparticles of WO₃ and Prussian blue

All-in-One Gel-Based Electrochromic Devices: Strengths and Recent Developments

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Electrochromism of a bipolar reversible redox-active ferrocene–viologen linked ionic liquid

Cited by 53 publications

References 34 publications

Flexible and Transparent Electrochromic Displays with Simultaneously Implementable Subpixelated Ion Gel‐Based Viologens by Multiple Patterning

Flexible and Transparent Electrochromic Displays with Simultaneously Implementable Subpixelated Ion Gel‐Based Viologens by Multiple Patterning

Green fabrication of a complementary electrochromic device using water-based ink containing nanoparticles of WO3 and Prussian blue

All-in-One Gel-Based Electrochromic Devices: Strengths and Recent Developments

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Green fabrication of a complementary electrochromic device using water-based ink containing nanoparticles of WO₃ and Prussian blue