Influence of Resonant Wavelengths on Microcavity OLEDs

摘要

We investigate the influences of resonant wavelengths on performances of microcavity organic light-emitting devices (OLEDs). Results show that by setting the normal-direction resonant wavelength around the peak wavelength of the intrinsic emission, one obtains the highest luminance enhancement along the normal direction, hardly detectable color shift with viewing angles, and highly directed emission. On the other hand, the highest enhancement in external quantum efficiencies and the most uniform brightness distribution are obtained by setting the normal-direction resonant wavelength 20-40 nm longer than the peak wavelength of the intrinsic emission.