Comment on “Improving Light Outcoupling Efficiency for OLEDs with Microlens Array Fabricated on Transparent Substrate”

Abstract EN

The recently published research article, titled “Improving Light Outcoupling Efficiency for OLEDs with Microlens Array Fabricated on Transparent Substrate,” provides a significant design rule for the high extraction efficiency of OLED devices [1].

According to the simulation results, the authors proposed that a well-organized microlens-embedding structure may increase 80% light output efficiency.

For an experimental demonstration, about 30% luminance enhancement was induced by a microlens-arrayed substrate.

The optical lens design was applied and revealed a noticeable improvement of OLED performances.

The authors demonstrated the improved OLED performances by using geometric designs of microlens arrays, which are formed on a glass substrate.

The microlens arrays were formed by photoresist material.

The photoresist film showed high transmittance above 90% for longer wavelengths (λ>500 nm); however, the photoresist microlens arrays have no electrical advantages for carrier transportation.