Three primary color (cyan/magenta/yellow) switchable electrochromic devices based on PEDOT:PSS and ‘electrobase/electroacid’ theory

2019 ◽  
Vol 43 (22) ◽  
pp. 8410-8413
Author(s):  
Guojian Yang ◽  
Baige Yang ◽  
Huiqi Zhang ◽  
Xiaojun Wang ◽  
Chang Gu ◽  
...  
Keyword(s):  
Electrochromic Device ◽  
Electrochromic Devices ◽  
Primary Color

A multicolor electrochromic device (ECD), which can switch among three primary colors cyan (C), magenta (M) and yellow (Y), was fabricated successfully.

Preparation, Electronic Structure and Optical Properties of the Electrochromic Thin Films

2004 ◽  
Vol 9 (4) ◽  
pp. 363-372 ◽  
Author(s):  
T. Lukaszewicz ◽  
A. Ravinski ◽  
I. Makoed
Keyword(s):  
Electrochromic Device ◽  
Orbital Method ◽  
Optical Parameters ◽  
Full Potential ◽  
Electrochromic Devices ◽  
Energy Bands ◽  
Conducting Film ◽  
Recombination Probability ◽  
Transparent Conducting ◽  
Smoluchowski Equations

A new multilayer electrochromic device has been constructed according to the following pattern: glass1/ITO/WO3/gel electrolyte/BP/ITO/glass2, where ITO is a transparent conducting film made of indium and tin oxide and with the surface resistance equal 8–10 Ω/cm2 . The electrochromic devices obtained in the research are characterized by great (considerable) transmittance variation between coloration and bleaching state (25–40% at applied voltage of 1.5 to 3 V), and also high coloration efficiency (above 100 cm2 /C). Selfconsistent energy bands, dielectric permittivity and optical parameters are calculated using a full-potential linear muffin-tin orbital method. The numerical solution of the Debye-Smoluchowski equations is developed for simulating recombination probability of Li+ ions in amorphous electrolyte.

A first truly all-solid state organic electrochromic device based on polymeric ionic liquids

2014 ◽  
Vol 50 (24) ◽  
pp. 3191-3193 ◽  
Author(s):  
Alexander S. Shaplov ◽  
Denis O. Ponkratov ◽  
Pierre-Henri Aubert ◽  
Elena I. Lozinskaya ◽  
Cédric Plesse ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Solid State ◽  
Solvent Free ◽  
Electrochromic Device ◽  
Simple Application ◽  
Electrochromic Devices ◽  
Polymeric Ionic Liquids ◽  
P Utilization

Utilization of polymeric ionic liquids in solvent-free electrochromic devices offers simple application of the latter in wide glazing and display production.

Linear and cross-linked mixed conducting polycarbazoles for electrochromic devices

2001 ◽  
Vol 708 ◽  
Author(s):  
François Tran-Van ◽  
Cédric Vancaeyzeele ◽  
Thierry Henri ◽  
Juozas V. Grazulevicius ◽  
Claude Chevrot
Keyword(s):  
Mechanical Properties ◽  
Ring Opening ◽  
Acidic Medium ◽  
Solid Electrolytes ◽  
Oxidation Potential ◽  
Electrochromic Device ◽  
Electrochromic Devices ◽  
Acid Catalyzed ◽  
The Stability ◽  
Cationic Ring Opening Polymerization

ABSTRACTA carbazole N-substituted by an oxyethylene group was polymerized using oxidative electro-polymerization. Due to the hydrophilic properties of the oligooxyethylene substituent, this monomer can be electropolymerized in aqueous solution. An acidic medium is particularly appropriate in order to decrease the oxidation potential of the monomer and to obtain films mainly composed of oligomers as revealed by SEC analysis. More particularly interesting is the stability of such material during polarization. In acidic medium 1.25 mol.L-1 HClO4, 95% of the charge density was maintained after polarization for 7000 cycles which shows the good electrochemical stability of this material compared to other polycarbazoles. Moreover, films are electroactive in aqueous electrolytes and would be well-compatible with polyethylene-oxide solid electrolytes.In order to increase the mechanical properties of the film, we have also electropolymerized an oligomer with pendant carbazole groups obtained by acid catalyzed cationic ring opening polymerization of [N(2,3-epoxypropyl)carbazole] which leads to a new dicarbazyl cross-linked polymer with cations solvating oxyethylene segments. Due to their tridimensional structure, the mechanical strength of these films is superior to that of a linear polycarbazole film. However, their electroactivity in aqueous electrolyte is poor. So, the electropolymerization of a mixture of both monomers ensures good mechanical properties and compatibility with hydrophilic electrolyte in view to prepare an electrochromic device.

A methyl ketone bridged molecule as a multi-stimuli-responsive color switch for electrochromic devices

2016 ◽  
Vol 4 (21) ◽  
pp. 4662-4667 ◽  
Author(s):  
Yu-Mo Zhang ◽  
Fuli Xie ◽  
Wen Li ◽  
Yuyang Wang ◽  
Weiran Zhang ◽  
...  
Keyword(s):  
Near Infrared ◽  
Methyl Ketone ◽  
Molecular Switch ◽  
Electrochromic Device ◽  
Stimuli Responsive ◽  
Electrochromic Devices

A new multi-stimuli-responsive molecular switch M5 with a methyl ketone bridge has been developed to fabricate a visible-near infrared absorbing electrochromic device.

scholarly journals Inkjet-printed all solid-state electrochromic devices based on NiO/WO3 nanoparticle complementary electrodes

Nanoscale ◽  
2016 ◽  
Vol 8 (1) ◽  
pp. 348-357 ◽  
Author(s):  
Guofa Cai ◽  
Peter Darmawan ◽  
Mengqi Cui ◽  
Jingwei Chen ◽  
Xu Wang ◽  
...  
Keyword(s):  
Solid State ◽  
Optical Modulation ◽  
Electrochromic Device ◽  
Electrochromic Devices

An all solid-state complementary electrochromic device with large optical modulation was assembled by inkjet-printed NiO and WO3 electrodes.

scholarly journals Automatic light-adjusting electrochromic device powered by perovskite solar cell

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Huan Ling ◽  
Jianchang Wu ◽  
Fengyu Su ◽  
Yanqing Tian ◽  
Yan Jun Liu
Keyword(s):  
Solar Cell ◽  
Light Absorption ◽  
Perovskite Solar Cell ◽  
Electrochromic Device ◽  
Driving Voltage ◽  
Electrochromic Devices ◽  
Smart Window ◽  
Colored State ◽  
Power Harvester ◽  
Self Powered

AbstractElectrochromic devices can modulate their light absorption under a small driving voltage, but the requirement for external electrical supplies causes response-lag. To address this problem, self-powered electrochromic devices have been studied recently. However, insensitivity to the surrounding light and unsatisfactory stability of electrochromic devices have hindered their critical applications. Herein, novel perovskite solar cell-powered all-in-one gel electrochromic devices have been assembled and studied in order to achieve automatic light adjustment. Two alkynyl-containing viologen derivatives are synthesized as electrochromic materials, the devices with very high stability (up to 70000 cycles) serves as the energy storage and smart window, while the perovskite solar cell with power-conversion-efficiency up to 18.3% serves as the light detector and power harvester. The combined devices can automatically switch between bleached and colored state to adjust light absorption with variable surrounding light intensity in real-time swiftly, which establish significant potentials for applications as modern all-day intelligent windows.

scholarly journals Electrosynthesis of Electrochromic Polymer Membranes Based on 3,6-Di(2-thienyl)carbazole and Thiophene Derivatives

Membranes ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 125
Author(s):  
Chung-Wen Kuo ◽  
Jui-Cheng Chang ◽  
Jeng-Kuei Chang ◽  
Sheng-Wei Huang ◽  
Pei-Ying Lee ◽  
...  
Keyword(s):  
Optical Memory ◽  
Polymeric Membranes ◽  
Electrochromic Device ◽  
Electrochromic Devices ◽  
Colored State ◽  
Thiophene Derivatives ◽  
Transmittance Change ◽  
Rapid Switching ◽  
Electrochromic Polymer ◽  
Transparent Conductive Electrodes

Five carbazole-containing polymeric membranes (PDTC, P(DTC-co-BTP), P(DTC-co-BTP2), P(DTC-co-TF), and P(DTC-co-TF2)) were electrodeposited on transparent conductive electrodes. P(DTC-co-BTP2) shows a high ΔT (68.4%) at 855 nm. The multichromic properties of P(DTC-co-TF2) membrane range between dark yellow, yellowish-green, gunmetal gray, and dark gray in various reduced and oxidized states. Polymer-based organic electrochromic devices are assembled using 2,2′-bithiophene- and 2-(2-thienyl)furan-based copolymers as anodic membranes, and poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonic acid) (PEDOT-PSS) as the cathodic membrane. P(DTC-co-TF)/PEDOT-PSS electrochromic device (ECD) displays a high transmittance change (ΔT%) (43.4%) at 627 nm as well as a rapid switching time (less than 0.6 s) from a colored to a bleached state. Moreover, P(DTC-co-TF2)/PEDOT-PSS ECD shows satisfactory optical memory (the transmittance change is less than 2.9% in the colored state) and high coloration efficiency (512.6 cm2 C−1) at 627 nm.

scholarly journals Next Generation Hybrid Nanofiber Based Electrochromic Devices

2018 ◽  
Vol 1 (1) ◽  
pp. 884-893
Author(s):  
Cigdem Dulgerbaki ◽  
Aliihsan Komur ◽  
Aysegul Uygun Oksuz
Keyword(s):  
Optical Modulation ◽  
Electrochromic Device ◽  
Electrochromic Devices ◽  
Entire Surface ◽  
Long Term Stability ◽  
Hybrid Nanofibers ◽  
Electrospinning Method ◽  
Hybrid Nanofiber ◽  
Generation Hybrid

This study focuses on the electrochromic device (ECD) applications of poly(3,4-ethylenedioxythiophene)/tungsten oxide (PEDOT/WO3) hybrid nanofibers prepared via electrospinning method. Nanoporous WO3 films were initially electrosynthesized on Pt sheet. The PEDOT layer was electropolymerized onto the entire surface of the WO3 nanoporous host framework in the presence of different ionic liquids: 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4), 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6), 1-butyl- 3-methylimidazolium bis(trifluoromethylsulfonyl) imide (BMIMTFSI), and 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl) imide (BMPTFSI). ECDs changed color reversibly from transparent to light brown by switching from +3 V to -3 V. It was found that the highest optical modulation of 47.89% and maximum coloration efficiency of 363.72 cm2/C is achieved for PEDOT/WO3/BMIMPF6 based electrochromic device. Hybrid nanofibers exhibited excellent long term stability even after 1000 chronoamperometric cycles.

scholarly journals Enhancement of Electrochromic Properties of Polyaniline Induced By Copper Ions

2021 ◽  
Author(s):  
Xiaohui Gao ◽  
Ting Qin ◽  
Lianwen Deng ◽  
Pin Zhang ◽  
Min Tang ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Thermal Management ◽  
Wavelength Range ◽  
Copper Ions ◽  
Critical Role ◽  
Electrochromic Device ◽  
Electrochromic Devices ◽  
Porous Films ◽  
Electrochromic Properties

Abstract Driven by the urgent need for adaptive infrared (IR) electrochromic devices, the improvement of electrochromic properties based on polyaniline (PANI) conducting polymers has become one of the research focuses. In recent years, the doping strategy has been proven to efficiently increase the IR modulation ability of PANI, but only limited to the acid species. Herein, the effects of copper ions on the structure and electrochromic properties of polyaniline were investigated. Compared to the pure polyaniline, the Cu-doped PANI porous films show better IR modulation ability. With the increasing concentration of copper ions, the emittance variation (∆ε) of Cu-doped PANI films exhibits a trend in volcanic pattern due to the critical role of the polarons and bipolarons. The optimal IR emissivity (ε) modulation obtained on Cu-doped PANI films shows the ∆ε modulation of 0.35 and 0.3 in the wavelength range of 8–14 µm and 2.5–25 µm, superior to previous reported pure sulfuric acid-doped PANI. Furthermore, a flexible IR electrochromic device was fabricated with the present Cu-doped PANI porous films. The modulation of the emittance variation varied between 0.513 and 0.834 (∆ε = 0.32 in ranges of wavelength 8–12 µm), suggesting the great potential for applications in military camouflage and intelligent IR thermal management.

scholarly journals Solution processable neutral state colourless electrochromic devices: effect of the layer thickness on the electrochromic performance

2016 ◽  
Vol 4 (42) ◽  
pp. 10090-10094 ◽  
Author(s):  
Gurhan Tahtali ◽  
Zeynep Has ◽  
Ceylan Doyranli ◽  
Canan Varlikli ◽  
Sermet Koyuncu
Keyword(s):  
Layer Thickness ◽  
Solution Process ◽  
Electrochromic Device ◽  
Electrochromic Devices ◽  
Neutral State ◽  
Solution Processable

In this study, a neutral state colourless electrochromic device fabricated through a solution process is introduced.

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