| 초록 |
In this work, two new hole transporting materials namely, HTM 1A and HTM 1B were synthesized by using Suzuki coupling and Buchwald-Hartwig reactions with significant yields. HTM 1A and HTM 1B showed higher glass transition temperature of 110 oC and 180 oC, respectively. The HOMO energy levels were between -5.54 to -5.33 eV and the energy levels were supported with proper charge hopping pathway to ensure the device efficiencies. To investigate the properties of our new design, we fabricated green PhOLED devices. HTM 1B showed better current and power efficiencies of 16.16 cd/A and 11.17 lm/W. At the same time, HTM 1B revealed excellent external quantum efficiencies of 13.64%. The efficiencies were considerably higher than that of Spiro-NPB and NPB-based reference devices. |
