Abstract
The spontaneous alignment of molecular dipoles that occurs in many organic light-emitting diodes (OLEDs) is known to blunt their performance, but is not easy to control within a given device stack. This study shows that coevaporating a small amount of polyethylene in the electron-transport layer of an OLED dramatically reduces the spontaneous orientational polarization, leading to increased device efficiency and lifetime due to decreased exciton-polaron annihilation in the emissive layer. This result highlights the potential of semiconductor dilution to improve OLED performance, and provides a new means to understand exciton-polaron-driven degradation in blue OLEDs.
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