| 초록 |
Sensitizer system of hyperfluorescent organic light-emitting diodes was studied by comparing two sensitizers with different molecular structure of side group. Among two sensitizers, one sensitizer that has small side group could not suppress efficiency loss by fluorescent emitter doping, but the other one that has bulky side group effectively suppressed the efficiency loss. Although the efficiency of the bulky side group donor based thermally activated delayed fluorescent (TADF) device was much lower than that of the small side group based TADF device, the efficiency of the hyperfluorescent device was almost the same. In particular, there was little decrease of the efficiency of the hyperfluorescent device using bulky side group based TADF sensitizer according to fluorescent emitter doping concentration. It was proven from this work that the bulky side group like t-butyl carbazole modified TADF molecules are effective as the sensitizer of the hyperfluorescent devices. |
