Abstract
The effect of hole-transport-layer thickness on deep-blue emission was experimentally and theoretically elucidated for top-emitting micro-cavity organic light-emitting diodes. As a result of strong optical interference in the micro-cavity, the emission spectrum and intensity from the top-emitting organic light-emitting diodes was strongly dependent on the viewing angle. Optimizing hole-transport-layer thickness lead to deep-blue emissions at a wavelength of about 460 nm with a current efficiency of 5 cd/A at 10,000 cd/m2 luminance. Light out-coupling in the top-emitting organic light-emitting diodes was modeled and calculated to show the power dissipation, and the model explained the experimental results well.
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