ABSTRACT
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(1987). One revolutionary aspect of the device (named OLED later) was the heterojunction between two amorphous organic insulators. e organic materials were chosen in a specic way to conne the recombination of the majority of injected carriers to the heterojunction region and away from the electrodes. It is noteworthy that despite more than two decades of active research and development in the organic electroluminescence eld, modern OLEDs, including polymer-based devices, still almost invariably inherit this feature.
