Double‐layered Black Electrochromic Device with a Single Electrode and Long‐Term Bistability

Ah, Chil Seong; Song, Juhee; Cho, Seong M.; Kim, Tae‐Youb; Kim, Han Na; Oh, Ji Yong; Chu, Hye Yong; Ryu, Hojun

doi:10.1002/bkcs.10103

Cited by 21 publications

(1 citation statement)

References 13 publications

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“…Due to their interesting electrical and optical properties, conductive polymers are potentially of use in many practical applications, such as metals and biosensors [1][2][3][4], supercapacitors [5,6], smart windows [7,8], etc. One of the most interesting features of conductive polymers is electrochromism, which is defined as reversible color change with applied potential [9][10][11]. The interest is mainly due to their unique properties, such as thin film processability, high color memory, low potential requirement, and simple device construction [12].…”

Section: Introductionmentioning

confidence: 99%

A new way to obtain black electrochromism: appropriately covering whole visible regions by absorption spectra of copolymers composed of EDOT and carbazole derivatives

Güzel

Karatas

2018

Smart Mater. Struct.

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There is a limited number of studies in the literature on materials showing electrochromic properties between black and transparent. In this study, black-to-transmissive electrochromic materials have been obtained as a result of electrochemical co-polymerization of carbazole derivatives (Cz1 and Cz2) and EDOT. Homopolymers and copolymers synthesizing different monomer feed ratios have been characterized by electrochemical and spectroelectrochemical methods. A new, simple, and fast method of obtaining black electrochromic material has been proposed.

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Section: Introductionmentioning

confidence: 99%

A new way to obtain black electrochromism: appropriately covering whole visible regions by absorption spectra of copolymers composed of EDOT and carbazole derivatives

Güzel

Karatas

2018

Smart Mater. Struct.

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Colorless‐to‐Black/Gray Electrochromic Devices Based on Single 1‐Alkyl‐1′‐Aryl Asymmetric Viologen‐Modified Monolayered Electrodes

Alesanco

Viñuales

Cabañero

et al. 2017

Advanced Optical Materials

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In the rising tendency of electrochromics and incipient development of multicolor systems, big attention is recently being paid to the colorless‐to‐black or gray electrochromic (EC) materials, since they can extend the applicability of the EC technology. However, the achievement of high performance EC materials which intrinsically provide colorless‐to‐gray/black electrochromism remains a strategic challenge. The present study reports on colorless‐to‐black/gray EC devices (ECDs) based on new 1‐alkyl‐1′‐aryl asymmetric viologens assembled in a nanostructured device configuration with poly(vinyl alcohol) (PVA)–borax gel electrolyte (conducting glass/viologen‐modified‐TiO2/PVA–borax gel electrolyte/conducting glass). The asymmetric viologens reported herein have been conveniently functionalized with anchoring groups in both alkyl and aryl substituents, ensuring rapid anchoring process (≈1 min) and strong binding affinity toward TiO2 monolayered working electrode. It is demonstrated herein that these ECDs based on a single asymmetric viologen provide not only gray but also real black electrochromism (a* and b* ≤ |5|) with great variation of the level of coloration (ΔL* = 53) and transmittance change (Δ%T ≥ 60), along with satisfactory switching times (5–10 s), transparent colorless‐off state, and good cyclability (≈10 000 cycles). Furthermore, these asymmetric viologens have also been tested in light‐scattering electrodes to prove their compatibility with them, extending their field of application.

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Optical and Electrical Properties of Electrochromic Devices Depending on Electrolyte Concentrations and Cell Gaps

Song

Cho

et al. 2016

Bulletin Korean Chem Soc

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The optical and electrical properties of electrochromic devices (ECDs) have been studied as a function of the electrolyte concentration and the cell gap. During tests, the electrolyte concentration was adjusted from 0.01 to 1 M LiClO 4 , and the cell gaps between the positive and negative electrodes were set at 25, 60, and 100 μm. By varying the electrolyte concentrations and the cell gap, various parameters such as the transmittance, response time, charge consumption, coloration efficiency, and bistability of ECD were comparatively analyzed. Viologen (VO) was used as the reduction electrochromic material, and triarylamine (TAA) was used as the oxidation material.

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Double‐layered Black Electrochromic Device with a Single Electrode and Long‐Term Bistability

Cited by 21 publications

References 13 publications

A new way to obtain black electrochromism: appropriately covering whole visible regions by absorption spectra of copolymers composed of EDOT and carbazole derivatives

A new way to obtain black electrochromism: appropriately covering whole visible regions by absorption spectra of copolymers composed of EDOT and carbazole derivatives

Colorless‐to‐Black/Gray Electrochromic Devices Based on Single 1‐Alkyl‐1′‐Aryl Asymmetric Viologen‐Modified Monolayered Electrodes

Optical and Electrical Properties of Electrochromic Devices Depending on Electrolyte Concentrations and Cell Gaps

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