| 초록 |
Two dibenzothiophene based compounds, 4-(3-(triphenylen-2-yl)phenyl)dibenzo[b,d]thiophene (DBTTP1) and 4-(5’-phenyl-[1,1’:3’,1’’-terphenyl]-3-yl)dibenzo[b,d]thiophene (DBTTP2), were used as the host materials for green thermally activated delayed fluorescent (TADF) emitter, (4s,6s)-2,4,5,6-tetra(9H-carbazol-9-yl)isophthalonitrile (4CzIPN) to investigate the effect of the molecular structure of the host materials on the efficiency and lifetime of the green TADF devices. The quantum efficiency of two green TADF OLEDs were above 17% and lifetime up to 80% of initial luminance were 250 h, 100 h, respectively. DBTTP1 was more suitable than DBTTP2 in terms of the lifetime of the green TADF devices. Therefore, triphenylene moiety can be used as the host material for long-lifetime green TADF device. |
