Display devices polyaniline

Kobayashi T., Yoneyama H., Tamura H. Polyaniline film-coated electrodes as electrochromic display devices J.Electroanal.Chem., 1984 161 429-23... 

Kobayashi T., Yoneyama H., Tamura H. Polyaniline film-coated electrodes as electrochromic display devices J.Electroanal.Chem., 1984 161 429-23 Kobayashi T., Yoneyama H., Tamura H. Electrochemical reactions concerned with electrochromism of polyaniline film-coated electrodes. J.Electroanal.Chem 1984 177 ... 

As an environmentally stable conducting polymer, polyaniline has been recognized as a potential candidate for application in secondary battery electrodes, sensors, electrochromic display devices, microelectronics, ion-exchange resins etc. [151-161]. 

T. Kobayashi, H. Yoneyama, H. Tamura, Polyaniline fihn-coated electrodes as electrochromic display devices, Journal of Electroanalytical Chemistry 1984, 161,419. 

Figure 167 Time for the derivative of PPV (OCiCio)-based device, ITO/polyaniline(50nm)/OCiCi0(100nm)/Ca/Al, to drop to half-luminescence of its initial value plotted as a function of temperature. The circles indicate 3 cm2 single pixel devices driven in DC. Squares indicate data for pixellated displays driven in pulsed mode (1/16 duty cycle, 200 Hz, same average luminance as DC devices). Current density for DC driven devices is 8.3mA/cm2. After Ref. 587. Copyright 1999 American Institute of Physics, with permission.

We are combining the selective deposition of polypyrrole and polyaniline on hydrophilic/hydrophobic surfaces as described in the preceeding section with the recent microcontact printing technique (18-20) to produce patterned conducting polymer films which we have demonstrated can be used in PDLC display-type devices. 

The photoluminescence of polyaniline has been studied as a function of the polymer redox state. It was stated that each of the three PANI species have fluorescent emissions with different quantum yields. When conductive domains are present, the emission fi-om excitons located either inside these domains or near to them is efficiently quenched [40], Organic electroluminescent devices (LED s) are a possible alternative to liquid crystal displays and cathodic tubes, especially for the development of large displays. The principal setup for a polymeric LED is ITO/light-emitting polymer/metal. A thin ITO electrode on a transparent glass or polymeric substrate serves as the anode, while metals such as Al, Ca or Mg are used as cathode materials. After applying an electric field, electrons and holes are injected into the polymer. The formation of e /h" " pairs leads to the emission of photons. One of most important opportunities to follow from the use of poly-... 

As miniaturization trends continue, and memory devices continually reach higher densities, this material demonstrates unique appeal due to the inherent nanoscale dimensions of the individual components of the nanocomposite. In order to show that even extremely small amounts of the nanocomposite material display the memory effect, a nanoscale writing or reading process is carried out using a conductive AFM tip in direct contact with the polyaniline nanofiber-gold nanoparticle thin... 

McCoy et al. [133] have shown that it is possible to carry out V-trifluoroacetylation in polyaniline. In this reaction polyaniline displays a continuum of states of nucleophilicity determined by the degree of oxidation of the polymer. It is interesting to note that the V-trifuluoroacetyl moiety can be hydrolysed to obtain original polyaniline. These aspects may prove important for the fabrication of certain devices. 

Extensive studies on polyaniline (PANI) have been carried out in the last five years. Some unique features related to PANI such as electrical conductivity, highly environmental stability, magnetic and electrochromic properties, and as well as availability have attracted much attention from both academic and industrial sectors (1). Among all the potential applications the most attractive one is the use as electronic devices such as electronic capacitors (2,3), sensors (4), electrochromic displays (2,3,5-9), and photodiodes (10,11). All these applications are based on its unique reduction-oxidation (redox) behavior and the associated spectral properties. 

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