Full-colour OLED Displays

To achieve full-colour displays it is necessary to have efficient low MW OLEDs that emit in the red, green and blue areas of the spectrum. Intensive research in this field has shown that this requirement can be met by careful selection of the ET host and loading this with the correct amount of a specific dopant, although there is a tendency for lower quantum efficiency. Some examples of the types of the emitters and host/dopants that produce the RGB trichromat are illustrated in Table 3.13. 

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Today, the major applications of OLEDs are small displays for MP3 players, mobile telephones and digital cameras, although some OLED TVs are available in the market. Full-colour OLED displays consist of a very large number of single pixels in the three primary colours of red, green and blue (RGB). In most commercial OLEDs the pixels are defined by vacuum evaporation of low-molar-mass materials, such as Alq3 and TAPC, through shadow masks. If polymers... 

Kodak is commercialising its low molecular weight OLEDs for use in both passive and active matrix display architectures. It has also licensed its technology to Pioneer Corp who have commercialised passive matrix displays for car radios and cellular phone displays. TDK has displays for cellular phones, personal digital assistants and car instrumentation clusters. Perhaps the most significant collaboration to date has been with Sanyo. Sanyo s capabilities in low-temperature polycrystalline silicon have been married with Kodak s low MW materials to produce a full colour, 5 inch active matrix display, commercialisation of which was expected in 2001. 

Numerous white OLEDs have been fabricated (Kido et al 1994, 19%, Dodabalapur et al 1994, Yang et al 1997). In the fabrication of full colour display all three primary colours have equal importance but white light emission has drawn particular attention because any desired colour range can be achieved by filtering of white light (Strukeji et al 19%, Zhang et... 

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