A Novel Electrophotographic System

Deb, S. K.

doi:10.1364/ao.8.s1.000192

Cited by 645 publications

(139 citation statements)

References 0 publications

Supporting

Mentioning

132

Contrasting

Order By: Relevance

“…Dark blue (1) where x number of electrons (ē) and lithium ions (Li + ) are inserted or ejected in or out of the system. Reversing the voltage restores the device to its previous clear (bleached) optical state.…”

Section: Introductionmentioning

confidence: 99%

Micro‐Raman spectroscopic characterization of a tunable electrochromic device for application in smart windows

Balaji

Albert

Djaoued

et al. 2008

J Raman Spectroscopy

View full text Add to dashboard Cite

An asymmetric electrochromic (EC) device based on an active EC tungsten oxide-titanium oxide (WO 3 -TiO 2 ) layer was constructed. The EC active layer consisted predominantly of monoclinic WO 3 nanocrystallites with a minor additional component of hexagonal WO 3 and amorphous TiO 2 . Detailed micro-Raman spectroscopic studies of the intercalation and deintercalation of lithium in the EC active layer of the EC device as a function of the applied voltage were performed. Three significant structural stages occur upon intercalating Li into the WO 3 -TiO 2 layer when coloration potentials of 1.0, 1.5, 2.0, and 3.0 V are applied to the EC device. In the first stage (applied potential of 1.0 V), the m-Li x WO 3 phase is retained. In the second stage, (applied potential of 1.5 and 2.0 V) the m-Li x WO 3 transforms to a tetragonal phase. In the third stage, (applied potential of 3.0 V) the Raman spectrum exhibits no spectral bands, showing that Li x WO 3 has attained the highest-symmetry cubic phase. This phase sequence is confirmed by the X-ray diffraction (XRD) measurement. These phase transitions can be reversed and, upon complete deintercalation, m-WO 3 with traces of h-WO 3 is recovered. Optical transmission studies were performed in conjunction with Raman and XRD studies. A shift of the optical transmittance peak position from 639 to 466 nm and reduction in the width of the transmittance curve with increasing applied potential opens up the possibility of smart window applications for the nanocrystalline WO 3 -based EC device.

show abstract

Section: Introductionmentioning

confidence: 99%

Micro‐Raman spectroscopic characterization of a tunable electrochromic device for application in smart windows

Balaji

Albert

Djaoued

et al. 2008

J Raman Spectroscopy

View full text Add to dashboard Cite

show abstract

“…[1,2] The electroactive species often exhibit various colors, in accompaniment with an electron-transfer reaction (reduction or oxidation) due to an applied voltage in a suitable device set-up. Many different classes of materials, such as organic systems, e.g., bipyridilium salts (also know as viologens), [3,4] electroactive conducting polymers (e.g., polyaniline, [5,6] polythiophenes [7,8] ), as well as inorganic systems based on transition metal oxides [1] (e.g., WO 3 [9,10] ) have been described.…”

Section: Introductionmentioning

confidence: 99%

Electrochromic Window Based on Conducting Poly(3,4-ethylenedioxythiophene)-Poly(styrene sulfonate)

Heuer¹,

2002

View full text Add to dashboard Cite

A short survey of technological aspects of electrochromism with various electroactive species is given. Different approaches with inorganic and organic materials have been pursued in the past. So far widespread usage of this technology for large area applications has not been achieved. Nevertheless one major technical product, self‐darkening rear‐view mirrors for cars, is already well established. This article reviews some research results on electroactive polythiophenes, especially poly(3,4‐alkylenedioxythiophenes). Some promising results with the commercially available electrically conducting polymer Baytron P (PEDT/PSS) are presented. It is demonstrated that an all solid‐state electrochromic multilayer assembly based on a polymeric electrochromic material might be close to technical realization. The coating of large area substrates with aqueous poly(3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate) dispersion can be a way to an economically viable product.

show abstract

“…Since its discovery in inorganic materials, [1] this property has aroused the interest of scientists over the past thirty years. [2] Electrochromic properties have proved especially useful or promising for the construction of mirrors, [3] displays, [4,5] windows [6±10] and earth-tone chameleon materials.…”

Section: Introductionmentioning

confidence: 99%

A Highly Stable, New Electrochromic Polymer: Poly(1,4‐bis(2‐(3′,4′‐ethylenedioxy) thienyl)‐2‐methoxy‐5‐2″‐ethylhexyloxybenzene)

Sönmez

Meng

Zhang

et al. 2003

Adv Funct Materials

117

View full text Add to dashboard Cite

A highly stable new electrochromic polymer, poly(1,4‐bis(2‐(3′,4′‐ethylenedioxy)thienyl)‐2‐methoxy‐5‐2″‐ethylhexyloxybenzene) (P(BEDOT‐MEHB)) was synthesized and its electrochemical and electrochromic properties are reported. P(BEDOT‐MEHB) showed a very well defined electrochemistry with a relatively low oxidation potential of the monomer at + 0.44 V versus Ag/Ag+, E1/2 at – 0.35 V versus Ag/Ag+ and stability to long‐term switching up to 5000 cycles. A high level of stability to over‐oxidation has also been observed as this material shows limited degradation of its electroactivity at potentials 1.4 V above its half‐wave potential. Spectroelectrochemistry showed that the absorbance of the π–π* transition in the neutral state is blue‐shifted compared to PEDOT, displaying a maximum at 538 nm (onset at 640 nm), thus giving an almost colorless, highly transparent oxidized polymer with a bandgap of 1.95 eV. Different colors observed at different oxidation levels and strong absorption in the near‐IR make this polymer a good candidate for several applications.

show abstract

A Novel Electrophotographic System

Cited by 645 publications

References 0 publications

Micro‐Raman spectroscopic characterization of a tunable electrochromic device for application in smart windows

Micro‐Raman spectroscopic characterization of a tunable electrochromic device for application in smart windows

Electrochromic Window Based on Conducting Poly(3,4-ethylenedioxythiophene)-Poly(styrene sulfonate)

A Highly Stable, New Electrochromic Polymer: Poly(1,4‐bis(2‐(3′,4′‐ethylenedioxy) thienyl)‐2‐methoxy‐5‐2″‐ethylhexyloxybenzene)

Contact Info

Product

Resources

About