| 초록 |
The relationship between the single crystal structure of materials and optical properties of doped OLED devices was investigated. The 1,6-bis-(10-[1,1′;3′,1″]terphenyl-5′-yl-anthracen-9-yl)-pyrene (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 6,12-bis-(10-[1,1′;3′,1″]terphenyl-5′-yl-anthracen-9-yl)-chrysene (DAC-TP). Such a highly twisted molecular structure can improve the electroluminescence (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−1 and 0.93 cd A−1, respectively. |
