Abstract
Spontaneous orientation polarization and the resulting giant surface potential of many organic molecules, especially electron-transport materials, have been known for years, yet various aspects of their influence on device performance have not been investigated thoroughly. In this study, the authors apply the concept of ``dipolar doping'' (diluting a polar species in a nonpolar matrix) to systematically tune the orientation polarization of a prototypical OLED layer stack. They find that a low concentration of a polar species (within the range of usual dye doping in OLEDs) can enhance carrier injection by an order of magnitude.
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