| 초록 |
The relationship between the single crystal structure of materials and the EL performance of doped OLED devices was investigated. The 1,6 DAP-TP has a dihedral angle (α) of 78.4° and a dihedral angle (β) of 81.2°, a relatively more twisted single crystal structure compared to that of DAC-TP. Such a highly twisted molecular structure can improve the EL efficiency of a material because it can inhibit rotational and vibrational motions. Also, since the doped state and single crystal structure imply, respectively, a diluted state and a molecular state, the EL efficiency of the doped OLED device is related to single crystal structure. In a 4% doped OLED device, 1,6 DAP-TP and DAC-TP showed CE of 2.10 cd/A and 0.93 cd/A, respectively. With its relatively more twisted single crystal structure, 1,6 DAP-TP showed higher CE in a doped OLED device than DAC-TP. |
