Related Experiment Video
Updated: Jan 26, 2026
08:12
Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
Published on: December 16, 2022
3.9K
Three Carbazole-Based Polymers as Potential Anodically Coloring Materials for High-Contrast Electrochromic Devices
1Department of Chemical and Materials Engineering, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan. d10115003@yuntech.edu.tw.
Polymers
|April 12, 2019
Summary
Three novel carbazole-based conjugated polymers were synthesized and demonstrated reversible electrochromic properties. Devices utilizing these polymers exhibited high optical contrast and stability, showing potential for advanced electrochromic applications.
Area of Science:
- Materials Science
- Polymer Chemistry
- Electrochemistry
Background:
- Carbazole-based conjugated polymers are promising materials for electrochromic devices due to their tunable electronic properties.
- Developing new polymers with enhanced electrochromic performance and stability is crucial for practical applications.
Purpose of the Study:
- To synthesize three novel carbazole-based conjugated polymers: poly(3,6-di(2-thienyl)carbazole) (PDTC), poly(2,7-bis(carbazol-9-yl)-9,9-spirobifluorene) (PS2CBP), and poly(3,6-bis(N-carbazole)-N-ethylcarbazole) (PCEC).
- To investigate the spectroelectrochemical properties and electrochromic behavior of these polymers.
- To construct and evaluate dual-type electrochromic devices (ECDs) using these polymers.
Main Methods:
- Electrochemical polymerization was employed to synthesize PDTC, PS2CBP, and PCEC.
- Spectroelectrochemical studies were conducted to analyze the redox states and color transitions.
- Dual-type electrochromic devices were fabricated using the synthesized polymers as anodic layers and PProDOT-Et₂ as the cathodic layer.
Main Results:
- All synthesized polymer films (PDTC, PS2CBP, PCEC) exhibited reversible electrochromic behavior.
- PS2CBP displayed a distinct four-color transition (gray, grayish-green, moss green, foliage green) at different applied voltages.
- PS2CBP and PCEC films showed maximum optical contrasts of 39.83% and 32.41%, respectively.
- The PCEC/PProDOT-Et₂ ECD achieved high optical contrast (38.25%) and coloration efficiency (369.85 cm²/C).
- The PS2CBP/PProDOT-Et₂ ECD demonstrated good optical memory and long-term cycling stability.
Conclusions:
- The synthesized carbazole-based conjugated polymers possess excellent reversible electrochromic properties.
- These polymers are suitable for constructing high-performance electrochromic devices with significant optical contrast and stability.
- The study highlights the potential of PDTC, PS2CBP, and PCEC for future electrochromic applications.
Related Concept Videos
02:34Polymers
40.6K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
40.6K
02:34Polymers
23.2K
23.2K
03:02Colors and Magnetism
14.0K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.0K
03:02Standard Electrode Potentials
50.0K
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
50.0K
01:24Color Vision
1.4K
Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
1.4K
01:26Phase Contrast and Differential Interference Contrast Microscopy
12.8K
Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
12.8K