scholarly journals Applications of Copolymers Consisting of 2,6-di(9H-carbazol-9-yl)pyridine and 3,6-di(2-thienyl)carbazole Units as Electrodes in Electrochromic Devices

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1251 ◽  
Author(s):  
Chung-Wen Kuo ◽  
Jui-Cheng Chang ◽  
Yu-Ting Huang ◽  
Jeng-Kuei Chang ◽  
Li-Ting Lee ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Switching Time ◽  
Electrochemical Polymerization ◽  
Redox Cycling ◽  
Electrochromic Devices ◽  
Optical Contrast ◽  
Cathodic Material ◽  
Redox States ◽  
Coloration Efficiency

A series of carbazole-based polymers (PdCz, P(dCz2-co-dTC1), P(dCz2-co-dTC2), P(dCz1-co-dTC2), and PdTC) were deposited on indium tin oxide (ITO) conductive electrodes using electrochemical polymerization. The as-prepared P(dCz2-co-dTC2) displayed a high ΔT (57.0%) and multichromic behaviors ranging from yellowish green, greenish gray, gray to purplish gray in different redox states. Five organic electrochromic devices (ECDs) were built using dCz- and dTC-containing homopolymers and copolymers as anodic materials, and poly(3,4-(2,2-dimethylpropylenedioxy)thiophene) (PProdot-Me2) as the cathodic material. The P(dCz2-co-dTC2)/PProdot-Me2 ECD presented remarkable electrochromic behaviors from the bleached to colored states. Moreover, P(dCz2-co-dTC2)/PProdot-Me2 ECD displayed a high optical contrast (ΔT, 45.8%), short switching time (ca. 0.3 s), high coloration efficiency (528.8 cm2 C−1) at 580 nm, and high redox cycling stability.

scholarly journals Electrochromic Properties of Lithium-Doped Tungsten Oxide Prepared by Electron Beam Evaporation

Coatings ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 191 ◽  
Author(s):  
Jui-Yang Chang ◽  
Ying-Chung Chen ◽  
Chih-Ming Wang ◽  
Wen-Nan Wang ◽  
Chih-Yu Wen ◽  
...  
Keyword(s):  
Electron Beam ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Cathode Materials ◽  
Room Temperature ◽  
Electron Beam Evaporation ◽  
Electrochromic Devices ◽  
Electrochromic Properties ◽  
Coloration Efficiency ◽  
Transmittance Change

In this study, xLi2O-(1−x)WO3 powders were mixed with WO3 and Li2O and pressed into target pellets to fabricate electrochromic films on indium tin oxide (ITO) glasses prepared by electron beam evaporation under the parameters of room temperature, and thicknesses of about 530 nm. It was expected that the amount of charge stored in the electrochromic devices (ECDs) could be enhanced by using the doping method in the cathode materials. The experimental results show that as the composition of Li0.18W0.82O2.6 powder was formed, the optimal characteristics of ECD can be obtained. In which, as a voltage of 3.5 V was applied on ECD, a transmittance change (ΔT%) of 53.1%, an optical density (ΔOD) of 0.502, an intercalation charge (Q) of 12.9 mC/cm2 and a coloration efficiency (η) of 41.6 cm2/C at a wavelength of 550 nm can be achieved. These results demonstrate that Li2O doping in WO3 films could effectively improve the coloration and electrochromic properties of ECD devices.

scholarly journals Applications of Electrochromic Copolymers Based on Tris(4-carbazoyl-9-ylphenyl)amine and Bithiophene Derivatives in Electrochromic Devices

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1895 ◽  
Author(s):  
Chung-Wen Kuo ◽  
Jui-Cheng Chang ◽  
Po-Ying Lee ◽  
Tzi-Yi Wu ◽  
Yu-Chang Huang
Keyword(s):  
Indium Tin Oxide ◽  
Switching Time ◽  
Electrochemical Polymerization ◽  
Green Light ◽  
Open Circuit ◽  
Electrochromic Devices ◽  
Light Yellow ◽  
Redox Stability ◽  
Transmittance Change ◽  
Dark Blue

Four copolymers (P(tCz (tris(4-carbazoyl-9-ylphenyl)amine)-co-bTP (2,2'-bithiophene)), P(tCz-co-CPDT (4H-cyclopenta[2,1-b:3,4-b’]dithiophene)), P(tCz-co-DTC (3,6-di(2-thienyl)carbazole)), and P(tCz-co-CPDTK (cyclopentadithiophene ketone))) are deposited on indium tin oxide (ITO) surfaces using electrochemical polymerization. Spectroelectrochemical properties of copolymer electrodes reveal that the colors of P(tCz-co-bTP) film are pinkish-orange, light olive green, light grayish blue, and dark blue at 0.0, 0.8, 1.2, and 1.6 V, respectively, whereas the color variations of P(tCz-co-CPDTK) film are light yellow, yellow, and blue at 0.0 V, 0.8 V, and 1.5 V, respectively. The ΔT of P(tCz-co-bTP), P(tCz-co-CPDT), P(tCz-co-DTC), and P(tCz-co-CPDTK) films are estimated to be 43.0% at 967 nm, 28.7% at 864 nm, 43.6% at 870 nm, and 24.5% at 984 nm, respectively. Five electrochromic devices (ECDs) are assembled using the tCz-based homopolymer and copolymers as coloring electrodes, and poly(2,2-dimethyl-3,4-propylenedioxythiophene) (PProDOT-Me2) as the complementary electrode. P(tCz-co-DTC)/PProDOT-Me2 ECD reveals high transmittance change (45.9% at 624 nm), P(tCz-co-CPDTK)/PProDOT-Me2 ECD shows high η (513.0 cm2 C−1 at 582 nm), and P(tCz-co-bTP)/PProDOT-Me2 ECD presents short switching time (less than 0.4 s) at 628 nm. Moreover, these ECDs show satisfactory redox stability and open circuit stability.

Carbon Nanotubes-Assisted Fabrication of TiO2 Nanocomposite Film for Optimum Electrochromic Application

2014 ◽  
Vol 989-994 ◽  
pp. 789-792
Author(s):  
Shu Ping Liu ◽  
Wei Wang ◽  
Lin Lin Cui ◽  
Hua Nan Guan
Keyword(s):  
Carbon Nanotubes ◽  
Self Assembly ◽  
Multilayer Film ◽  
Great Promise ◽  
Layer By Layer ◽  
Electrochromic Devices ◽  
Optical Contrast ◽  
Coloration Efficiency ◽  
Assembly Method

Electrochromic composite film consisting of TiO2, chitosan (CS) and carbon nanotubes (CNTs) were fabricated on quartz and FTO substrates by the layer-by-layer self-assembly method (LbL). The multilayer film was characterized by UV-vis spectrum, scanning electron microscopy (SEM), cyclic voltammetry (CV) and chronoamperometric (CA) and in situ spectral electrochemicalmeasurements. The composite material shows high electrochromic performance, with the optical contrast of 11.5% and coloration efficiency of 21.7 cm2/C at 800 nm. The results indicate great promise for the TiO2-based film as a potential material in electrochromic devices.

High performance electrochromic devices based on a polyindole derivative, poly(1H-benzo[g]indole)

2015 ◽  
Vol 3 (43) ◽  
pp. 11318-11325 ◽  
Author(s):  
Guangming Nie ◽  
Ling Wang ◽  
Changlong Liu
Keyword(s):  
Response Time ◽  
High Performance ◽  
Optical Memory ◽  
Fast Response ◽  
Electrochromic Devices ◽  
Optical Contrast ◽  
Fast Response Time ◽  
Coloration Efficiency ◽  
Long Term Stability

An ECD based on electrochromic poly(1H-benzo[g]indole) was fabricated. The color of this ECD can switch between green and navy blue with good optical contrast, high coloration efficiency, fast response time, better optical memory and long-term stability.

Comparison of Indium Tin Oxide and Indium Tungsten Oxide as Transparent Conductive Substrates for WO3-Based Electrochromic Devices

2016 ◽  
Vol 164 (2) ◽  
pp. H25-H31 ◽  
Author(s):  
Anthony Maho ◽  
Sylvain Nicolay ◽  
Laura Manceriu ◽  
Gilles Spronck ◽  
Catherine Henrist ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Electrochromic Devices ◽  
Conductive Substrates

Performance of chromophore-type electrochromic devices employing indium tin oxide nanorod optical amplification

2012 ◽  
Vol 98 ◽  
pp. 191-197 ◽  
Author(s):  
Jen-Hsien Huang ◽  
Min-Hsiang Hsu ◽  
Yu-Sheng Hsiao ◽  
Peilin Chen ◽  
Peichen Yu ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Electrochromic Devices ◽  
Optical Amplification

A Transparent Multidimensional Electrode with Indium Tin Oxide Nanofibers and Gold Nanoparticles for Bistable Electrochromic Devices

2020 ◽  
Vol 12 (24) ◽  
pp. 27453-27460 ◽  
Author(s):  
Guojian Yang ◽  
Baige Yang ◽  
Weijia Mu ◽  
Yinghao Ge ◽  
Yiru Cai ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Electrochromic Devices

Arsenic(iii) detection using electrochemical–chemical–chemical redox cycling at bare indium–tin oxide electrodes

The Analyst ◽  
2014 ◽  
Vol 139 (22) ◽  
pp. 5813-5817 ◽  
Author(s):  
Jinkyo Jeong ◽  
Jagotamoy Das ◽  
Moonjung Choi ◽  
Jinkyung Jo ◽  
Md. Abdul Aziz ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Redox Cycling ◽  
Oxide Electrodes
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