Abstract
AbstractThe internal and external efficiency were found can be simultaneously improved by insertion a high refractive index material, titanium oxide (TiOx), to the emission layer and a prism sheet attached to the substrate. The TiOx layer resulted in a better electron‐hole balance and thus increased the internal efficiency. However, it also led a wider angular FWHM of emission profile with more photons trapped in the substrate. By using the prism sheet, those trapped light was efficiently coupled to the air. The extraction efficiency enhancement at normal direction was increased from 33.1% to 54.4% without any device electricity degeneration. The overall current efficiency was improved 86% when 20‐nm‐thick TiOx film was used.
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