| 초록 |
OLEDs using phosphorescence have been employed worldwide as a lighting application because of their excellent efficiency. Bipolar hosts phosphorescence OLEDs require large energy gaps, high charge carrier mobility for both electrons and holes, high thermal stability. In this study, bipolar host materials were synthesized, and the charge-transporting propertiea for the hole and electron were controlled by attaching different substituent, thus changing the molecular spatial geometries. The device characteristics demonstrated that the host materials with balanced charge-transporting properties exhibits enhanced electroluminescence properties. |
