| 초록 |
Blue host materials for phosphorescent organic light-emitting diodes (PHOLEDs) were synthesized with donor-acceptor moiety as a core structure which was modified with three different units to control charge transport property. The materials showed high triplet energy above 2.85 eV, and their highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels are -5.90/-2.79, -5.90/-2.72 and -5.89/-2.67 eV, respectively, depending on the substituent of the core structure. Maximum quantum efficiencies of 23.4%, 19.6% and 17.4% were obtained with low driving voltage in blue PHOLEDs using the new host materials. |
