| 초록 |
We successfully synthesized two 3,3-bicarbazole derivatives with different functional moieties as host material for blue phosphorescent organic light emitting diodes. Although the two 3,3-bicarbazole moiety derived compounds showed same color coordinates of (0.19, 0.40), the current density of a single charge device was measured differently. The hole transport characters of two materials were similar because of the same HOMO localization in the bicarbazole moiety. But the electron transport characters of that were dissimilar due to the LUMO localization in different functional groups. In addition, the lifetime of two host material devices doped with Ir(dbi)3 showed significant distinction. The glass transition temperatures was above 100℃ and the maximum quantum efficiency was 22.1%. |
