Subject hole transport layer

An important application of polydimethylsilane is as a source of silicon carbide (SiC) fibres, which are manufactured under the trade-name Nicalon by Nippon Carbon in Japan. Heating in an autoclave under pressure converts polydimethylsilane to spinnable polycarbosilane (-Me2Si-CH2-) with elimination of methane. The spun fibres are then subjected to temperatures of 1200-1400 °C to produce silicon carbide fibres with very high tensile strengths and elastic moduli." As a result of their conductivity, polysilanes have also been used as hole transport layers in electroluminescent devices. In addition, the photoconductivity of polymethylphenylsilane doped with Cgo has been found to be particularly impressive. ... 

Organic electroluminescent devices have been the subject of intense research for almost a decade. These organic molecule-based devices use a multilayer cell structure composed of emitted layers and carrier transport layers as shown by Tang et al. [264-5]. The next advance in these devices was the construction of a three-layer cell by Adachi et al. [266] in which the emitter layer was sandwiched between a hole transport layer and an electron transport layer in the belief that these layers would increase electroluminescent efficiency. The device has the type of constmction shown in Figure 12.25. Adachi et al. reported that with a 500 A° emitter thickness, the luminescence was 1000 Cd cm. ... 

Organic electroluminescent (EL) devices are the subject of study by many researchers because of their potential application as light-emitting devices which operate at low drive voltages. These devices are injection-type, in which carriers, such as electrons (radical anions) and holes (radical cations), are injected into the organic emitter layer where they recombine. It is, therefore, necessary for the component organic materials to possess carrier-transporting properties as well as fluorescence properties. 

---