Electrochromic Polymer Ink Derived from a Sidechain‐Modified EDOT for Electrochromic Devices with Colorless Bright State

Macher, Sven; Sassi, Mauro; Beverina, Luca; Posset, Uwe; Schott, Marco; Giffin, Guinevere A.; Löbmann, Peer

doi:10.1002/celc.202001595

Cited by 5 publications

(2 citation statements)

References 42 publications

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“…The polymer thin film exhibits reversible redox peaks at a potential of 3.0 V (anodic scan) and 2.4 V (cathodic scan) vs. Li/Li + (∆E p = 600 mV) corresponding to the oxidation (charging) and reduction (discharging) process, respectively, of the conjugated PEDOT backbone. The results from the CV measurements are in agreement with previously published data of PEDOT and PEDOT derivatives [35,36]. The results from the cycling stability measurements are shown in Figure 2b.…”

Section: Pedot:pss Electrodesupporting

confidence: 91%

Flexible Electrochromic Device on Polycarbonate Substrate with PEDOT:PSS and Color-Neutral TiO2 as Ion Storage Layer

et al. 2023

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Electrochromic (EC) windows on glass for thermal and glare protection in buildings, often referred to as smart (dimmable) windows, are commercially available, along with rearview mirrors or windows in aircraft cabins. Plastic-based applications, such as ski goggles, visors and car windows, that require lightweight, three-dimensional (3D) geometry and high-throughput manufacturing are still under development. To produce such EC devices (ECDs), a flexible EC film could be integrated into a back injection molding process, where the films are processed into compact 3D geometries in a single automized step at a low processing time. Polycarbonate (PC) as a substrate is a lightweight and robust alternative to glass due to its outstanding optical and mechanical properties. In this study, an EC film on a PC substrate was fabricated and characterized for the first time. To achieve a highly transmissive and colorless bright state, poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) was used as the working electrode, while titanium dioxide (TiO2) was used as the counter electrode material. They were deposited onto ITO-coated PC films using dip- and slot-die coating, respectively. The electrodes were optically and electrochemically characterized. An ECD with a polyurethane containing gel electrolyte was investigated with regard to optical properties, switching speed and cycling behavior. The ECD exhibits a color-neutral and highly transmissive bright state with a visible light transmittance of 74% and a bluish-colored state of 64%, a fast switching speed (7 s/4 s for bleaching/coloring) and a moderately stable cycling behavior over 500 cycles with a decrease in transmittance change from 10%to 7%.

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Section: Pedot:pss Electrodesupporting

confidence: 91%

Flexible Electrochromic Device on Polycarbonate Substrate with PEDOT:PSS and Color-Neutral TiO2 as Ion Storage Layer

et al. 2023

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“…

Conjugated semiconducting polymers are key components for printed electronics, a field rapidly approaching the laboratory to industry transition. Over the last few decades, enormous progresses in the development of reliable structure properties relationships enabled the synthesis of very efficient active materials for organic light emitting devices (OLEDs), [1] organic photovoltaic (OPV) cells, [2] organic field effects transistors (OFETs), [3] thermoelectric generators, [4,5] chemical sensors, [6] bioelectronic devices, [7] light emitting electrochemical cells, [8] electrochromic devices, [9,10] and many more. The main reasons for the success of this class of materials are the vast tunability of properties that can be achieved through molecular design and the processability via wet techniques.

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confidence: 99%

Organic Solvent Free Synthesis and Processing of Semiconducting Polymers for Field Effect Transistors in Waterborne Dispersions

Ceriani

Scagliotti

Losi

et al. 2023

Adv Elect Materials

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Conjugated semiconducting polymers are key active materials for printable electronics, sensors and biosensors, organic photovoltaics, organic light emitting devices, and more. The research in the field developed very efficient materials and sound structure property relationships, thus making a case for a transition from laboratory to industrial environment. At this critical juncture, sustainability, and ease of scaling up are at least as important as performances, to the point that efficient materials on a lab scale could become unpractical for the industry. The development of more efficient synthetic protocols and the complete removal of all organic solvents from both the synthesis and the processing of semiconducting polymers can help tremendously to improve sustainability and reduce costs. It is shown that the use of an aqueous dispersion of the food grade surfactant lecithin as the medium, enables the synthesis and processing of the representative semiconducting alternating copolymer poly (9,9‐dioctylfluorene‐alt‐bithiophene) (PF8T2) in high yield and high quality and with transistor performances comparable with those obtained with reference materials synthetized and processed from volatile organic solvents.

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Spectrum Reconstruction Model Based on Multispectral Electrochromic Devices

Wang,

Yin,

et al. 2024

Advanced Science

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Reconstructing the visible spectra of real objects is critical to the spectral camouflage from emerging spectral imaging. Electrochromic materials exhibit unique superiority for this goal due to their subtractive color‐mixing model and structural diversity. Herein, a simulation model is proposed and a method is developed to fabricate electrochromic devices for dynamically reproducing the visible spectrum of the natural leaf. Over 20 kinds of pH‐dependent leuco dyes have been synthesized/prepared through molecular engineering and offered available spectra/bands to reconstruct the spectrum of the natural leaf. More importantly, the spectral variance between the device and leaf is optimized from an initial 98.9 to an ideal 10.3 through the simulation model, which means, the similarity increased nearly nine‐fold. As a promising spectrum reconstruction approach, it will promote the development of smart photoelectric materials in adaptive camouflage, spectral display, high‐end encryption, and anti‐counterfeiting.

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Electrochromic Polymer Ink Derived from a Sidechain‐Modified EDOT for Electrochromic Devices with Colorless Bright State

Cited by 5 publications

References 42 publications

Flexible Electrochromic Device on Polycarbonate Substrate with PEDOT:PSS and Color-Neutral TiO2 as Ion Storage Layer

Flexible Electrochromic Device on Polycarbonate Substrate with PEDOT:PSS and Color-Neutral TiO2 as Ion Storage Layer

Organic Solvent Free Synthesis and Processing of Semiconducting Polymers for Field Effect Transistors in Waterborne Dispersions

Spectrum Reconstruction Model Based on Multispectral Electrochromic Devices

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