Diffuse color patterning using blended electrochromic polymers for proof‐of‐concept adaptive camouflage plaques

Brooke, Robert; Fabretto, Manrico; Pering, Samuel; Switalska, Eliza; Reeks, Lachlan; Evans, Drew; Murphy, Peter

doi:10.1002/app.42158

Cited by 19 publications

(10 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…PEDOT’s electrochromic behavior is suitable for many applications, ranging from smart windows to smart package displays [ 20 ]. Several reports have recognized that the possibility to pattern PEDOT could significantly extend its functionality and application potential [ 17 , 21 ]. While dip-pen lithography and other techniques have achieved submicrometer patterning resolution, they generally require expensive equipment and long processing times [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Greyscale and Paper Electrochromic Polymer Displays by UV Patterning

et al. 2019

Self Cite

View full text Add to dashboard Cite

Electrochromic devices have important implications as smart windows for energy efficient buildings, internet of things devices, and in low-cost advertising applications. While inorganics have so far dominated the market, organic conductive polymers possess certain advantages such as high throughput and low temperature processing, faster switching, and superior optical memory. Here, we present organic electrochromic devices that can switch between two high-resolution images, based on UV-patterning and vapor phase polymerization of poly(3,4-ethylenedioxythiophene) films. We demonstrate that this technique can provide switchable greyscale images through the spatial control of a UV-light dose. The color space was able to be further altered via optimization of the oxidant concentration. Finally, we utilized a UV-patterning technique to produce functional paper with electrochromic patterns deposited on porous paper, allowing for environmentally friendly electrochromic displays.

show abstract

Section: Introductionmentioning

confidence: 99%

Greyscale and Paper Electrochromic Polymer Displays by UV Patterning

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…This gives them the potential of being exploited because of their favorable electrochromic behaviors . Thus, these polymers have been used in a variety of applications such as adaptive camouflage and other optoelectronic devices . For instance, because PEDOT is a p-type material it has been utilized as a hole injection layer in anodes for organic light-emitting diodes. − Because these polymers are also optically active they have been utilized in so-called “smart windows” for automotive and building applications .…”

Section: Introductionmentioning

confidence: 99%

Influence of Postsynthesis Heat Treatment on Vapor-Phase-Polymerized Conductive Polymers

et al. 2018

Self Cite

View full text Add to dashboard Cite

The effect of thermal treatment on the structure and electrical/optical properties of vapor phase-polymerized poly(3,4-ethylenedioxythiophene):tosylate (PEDOT:Tos) and polypyrrole:tosylate (PPy:Tos) polymer films was investigated. Thermal treatment was applied postpolymerization but prior to washing the embedded oxidant layer out of the polymer film. Structural and chemical changes arising from the treatment were studied in the context of their conductive and electrochromic behavior. Spectroscopic analysis indicated a rise in the doping levels of both conductive polymers when exposed to thermal treatment. Additionally, an increase in the film thickness was recorded after the oxidant and other unbound species were removed from the polymer layer using an ethanol rinse. As such, a strong indication that polymerization continued even in the absence of (external) monomer vapor was present. This film thickness increase was most pronounced for PPy:Tos but also present in the PEDOT:Tos film. Heat-treated films exhibited enhanced cohesion, making them more robust and therefore increasing the viability for the material to be used in the optoelectronics area. This robustness, due to additional (cross-linking) oligomer growth, came at the expense of lower conductivity relative to their untreated counterparts.

show abstract

“…Generally they are known as color changing devices and find applications in smart windows, sunglasses, displays, and autodimming rear-view mirrors, etc. − However, their application is not restricted to the phenomenon of color change. They are emerging as novel devices for infrared camouflage in military applications and for satellite thermal control. − Besides their interesting applications, ECDs have also attracted considerable attention due to their low power consumption. , Electrochromic devices can be either transmissive/absorptive or reflective depending on the type of application. For example, in smart window and goggle applications, transmissive devices are essential.…”

Section: Introductionmentioning

confidence: 99%

ITO-Free Solution-Processed Flexible Electrochromic Devices Based on PEDOT:PSS as Transparent Conducting Electrode

Singh

Tharion

Murugan

et al. 2016

ACS Appl. Mater. Interfaces

134

View full text Add to dashboard Cite

Electrochromic devices (ECDs) are emerging as novel technology for various applications ranging from commercialized smart window glasses, goggles, and autodimming rear view mirrors to uncommon yet more sophisticated applications such as infrared camouflage in military and thermal control in space satellites. The development of low-power, lightweight, inexpensive, and flexible devices is the need of the hour. In this respect, utilizing PEDOT:PSS as transparent conducting electrode (TCE) to replace indium tin oxide (ITO) and metal based TCEs for ECDs is a promising solution for the aforementioned requirements. In this work we have demonstrated the performance of PEDOT:PSS films coated on flexible substrates, treated with PTSA-DMSO, as TCEs for ECD applications and their comparison with that of ITO based ECDs. The PEDOT:PSS based flexible TCEs used in this study have conductivity of 1400-1500 S·cm and figure of merit (FoM) of 70-77. The process of increasing the conductivity of PEDOT:PSS films also led to the broadening of the conducting potential window (CPW), which is important for electrochemical applications of PEDOT:PSS when used as a stand-alone electrode. More than achieving a comparable electrochromic contrast, switching time, and coloration efficiency with respect to the ITO based ECDs, PEDOT:PSS devices also had the added advantage of good mechanical flexibility. These devices demonstrated superior stability during electrochemical cycling and multiple mechanical bending tests, making them an inexpensive alternative to the costly ITO based ECD technology.

show abstract

Diffuse color patterning using blended electrochromic polymers for proof‐of‐concept adaptive camouflage plaques

Cited by 19 publications

References 51 publications

Greyscale and Paper Electrochromic Polymer Displays by UV Patterning

Greyscale and Paper Electrochromic Polymer Displays by UV Patterning

Influence of Postsynthesis Heat Treatment on Vapor-Phase-Polymerized Conductive Polymers

ITO-Free Solution-Processed Flexible Electrochromic Devices Based on PEDOT:PSS as Transparent Conducting Electrode

Contact Info

Product

Resources

About