16.1: Invited Paper: Enhancement of optical efficiency in white OLED using a patterned quantum dot film with light recycling components

Abstract

We applied the patterned QD film to white OLED displays to increase the optical efficiency by converting the unnecessary light from white OLED before being cut by color filter. The red and green patterned quantum dot (QD) film has been developed using general photolithography process. In addition, we have studied on further enhancement of optical efficiency by applying various light recycling components, such as long‐pass filter (LPF), air‐gapped bridges, and TiO2 nanoparticles. Compared with a white OLED display with only color filters (CFs), it was confirmed experimentally that the optical efficiencies of red and green light were increased up to 158% and 117% in our proposed white OLED display after applying patterned QD film with light recycling components which are based on the mechanism of total internal reflection (TIR) and scattering characteristics.