Influence of cavity effects on light extraction efficiency in organic light emitting devices

摘要

In this paper, we demonstrate that the light extraction efficiency of an OLED is a strong function of the location of the recombination zone and the ratio of the extracted mode to the substrate guided mode varies from 22% to 55%. The large variation of the extraction efficiency in most OLEDs is the direct result of optical cavity effect present in the devices. In addition, we show that the light intensity profile varies from a Lambertian shape to a non-Lambertian shape depending of the device geometry.