Applications, photoconductors efficiencies

Pyroelectric infrared detectors are inferior in detectivity by one or two orders of magnitude compared with photoconductors such as cadmium mercury telluride, as shown in Fig. 7.15. However, such materials require temperatures of 200 K for efficient operation and generally respond to rather narrow bands at the infrared wavelengths. Pyroelectric devices can discriminate temperature differences of 0.1 K but find many useful applications in which the discrimination is limited to about 0.5 K. They have the great practical advantage of operating at normal ambient temperatures. 

Among the electron transport agents, derivatives of oxadiazole [34, 35] have been extensively studied. (Oxadiazoles do emit quite efficiently, but the wavelengths [36] are generally too short to be useful for display applications). By far the most widely used hole transport materials are the aryl-amines, exemplified by TPD [37] (see Table 13-2). Because of their use in electrophotographic photoconductors, dating back to the 1970s, there is an extensive literature [38] on the... 

Polyacetylene itself has not found application in light-emitting diodes. rrans-Polyacetylene has a very low quantum yield for emission, being instead an efficient photoconductor. See Chapter 6 in [14]. 

In addition, some quinacridones have found unusual applications. For example, both quinacridone and its 2,9-dimethyl derivative have been found to exhibit desirable photovoltaic characteristics , and show relatively high power conversion efficiencies in solar cell fabrication. Some quinacridones have also been found to be reasonably good photoconductors, and 2,9-dichloroquinacridone has been shown to be a photoreceptor in electrophotography. A variety of other atypical applications have also been claimed in the patent literature. 

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