| 초록 |
The electron transport material is the key factor to determine PHOLED devices performance. Herein, we synthesized two new electron transporting materials (ETM) namely, 9,10-bis(5-(naphthalen-1-yl)pyridin-2-yl)-4a,9a-dihydroanthracene (PyIN) and 9,10-bis(6-(naphthalen-1-yl)pyridin-3-yl)-4a,9a-dihydroanthracene (PyOUT). Their photophysical, thermal and electrochemical properties were successfully investigated. we introduce the new ETL into the PHOLED device, Ir(mppy)3, (tris[2-(p-tolyl)pyridine] iridium(III)) as dopant. The optimized device showed ideal PHOLED device performance. We achieved extremely high EQEmax 26.4% and practical luminance at 5000 cd m-2 were 22.1%. In addition, we achieved the maximum current efficiency of 92.3 cd A-1 and, maximum power efficiency of 82.8 lm W-1 by using new electron transport material. The above results clearly indicating that the new ETL most promising candidate for in order to achieve high performance PHOLED. |
