Abstract
Strong and efficient light emission from organic light emitting devices (OLEDs) fabricated by simple solution process is potentially useful for the manipulation of light in information display and lighting technologies. Recently, intensive research has been conducted into the development of OLEDs for realizing strong light emission from a simple OLED structure. In this chapter, highly efficient and enhanced light emission will be described for solution-processed phosphorescent OLEDs (PHOLEDs) doped with ionic salt, treated with the simultaneous electrical and thermal annealing. Because the simultaneous annealing causes the adsorption of charged salt ions at the electrode surfaces, the separated charges act as ionic doping in organic semiconductor layer and the electronic energy levels of the organic molecules are bended by the electric fields due to the adsorbed charged ions at the electrode interfaces, i.e., the simultaneous annealing can induce the proper formation of ionic p-i-n structure.
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