P‐100: Improvement of Film Profile and Device Performance with Different HIL Inks for High‐Resolution Display in Solution‐Processed OLED

In this paper, we investigated film profile and device performance in pixel of 80ppi, 144ppi and 200ppi with 2nd harmonic structure which had thicker HIL and HTL. Pile‐up phenomena depended on ink formulation and pixel size and target film thickness. The excessive pile‐up was occurred in smaller pixel with same ink. Profiles were improved with changing the first layer ink that it had suppressed pile‐up in 200ppi size pixel. Device performance was also achieved in 200ppi size pixel compared with 80ppi size pixel device.