| 초록 |
A series of modified 4,4′-Cyclohexylidenebis[N,N-bis(4-methylphenyl)benzenamine] (TAPC), TAPC, SiTAPC, 2MeSi(TPA)2, MeSi(TPA)3 derivative have been tested as Hole-Transport Material for deep blue phosphorescent OLEDs. Systematic investigations of their thermal-, photophysical-, and Hole-transporting (HT) properties were carried out. Low-temperature photoluminiscenec spectra indicate that all the prepared TAPC moieties maintained high triplet energy states up to 2.9 eV owing to the suppression of electron delocalization by silicon centre. All prepared compounds have high triplet energy levels, which is compatible with the energy level of blue phosphorescent emitting layer in blue OLED device. TDDFT calculations were also performed to figure out their frontier orbital distributions and their transition states. In current-voltage (I-V) measurement (hole only devices (HOD)) to estimate their hole mobilities, the MeSi(TPA)3 showed higher current density than the other analogs. |
