| 초록 |
We designed soluble thermally activated delayed-fluorescence (TADF) dopant by modifying 2,4,5,6,-tetra(carbazol-9-yl)-1,3-dicyanobenzene (4CzIPN) for high efficiency solution processed TADF devices. 2,4,5,6-tetra(3,6-dimethylcarbazoly-9-yl)-1,3-dicyanobenzene (m-4CzIPN) and 2,4,5,6-tetra(di-tert-butylcarbazoly-9-yl)-1,3-dicyanobenzene (t-4CzIPN) soluble TADF materials were designed to dissolve in aromatic solvent because two TADF dopants have aliphatic group for preventing aggregation of the dopant material themselves. Two soluble TADF dopant materials were synthesized by adding a methyl or tert-butyl group for increasing solubility based on the 4CzIPN TADF dopant. The solution device performance of 4CzIPN and m-4CzIPN was poor compared to TADF devices by vacuum process. However, high quantum efficiency 17.1 % by vacuum process and 18.3 % by solution process was achieved using t-4CzIPN, respectively. |
