| 초록 |
Two thermally activated delayed fluorescence (TADF) molecules with high reverse intersystem crossing (RISC) rate and moderate photoluminescence quantum yields (PLQY) were designed by modifying donor moieties of 2,3,5,6-tetra(9H-carbazol-9-yl)terephthalonitrile (4CzTPN). Modified donor moieties induced strengthened charge transfer state resulting in higher RISC rate. Two TADF molecules were successfully synthesized through nucleophilic reaction and utilized as assistant dopants in hyperfluorescence organic light emitting diodes. The higher RISC rate successfully suppressed dexter energy transfer to fluorescence emitter, achieving external quantum efficiencies (EQE) of 11.3% and 13.0% respectively at color coordinate (0.60, 0.40). |
