Abstract
In the past three decades, organic light-emitting diodes (OLEDs) have made a huge breakthrough in both research and industry. At present, OLED technology is used in commercial applications such as displays for mobile phones and portable digital media players, car radios and digital cameras. The high light output of OLEDs means they are favoured in portable applications for readability in sunlight and their low power drain. These achievements show us the great charm of flexible electronics based on organic materials. All of these developments not only depend on the improvement of processing technology, but also on the in-depth understanding of the device physics and synthesis of new organic materials. The physical and chemical properties of the major material constituent of the OLED largely determine the final device performance. In the first half of this chapter, we consider the energy level of the molecule as a clue to the characteristics of organic semiconductors, including energy lever alignment for OLEDs and tuning of molecular energy level. In the second part, we discuss the photophysical behavior and thermal stablity of materials for OLEDs.
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