P‐135: New Hole‐Transport Materials Composed of Indenocarbazole‐Based Copolymer for Ultra‐High‐Efficiency Solution‐Processed OLED

Abstract

New hole transport indenocarbazole based copolymers, KHU‐HTL1 and KHU‐HTL2, were found to have good solubility, intermediate HOMO levels, especially good charge transport properties due to low hole reorganization energy. Subsequently, the device with KHU‐HTL1 showed a maximum current efficiency up to 100.4 cd/A. To the best of our knowledge, the efficiency value we achieved from the solution processed green phosphorescent OLEDs with this material is one of the best efficiency realized from solution‐processed OLED.