Star-shaped hexakis(9,9-dihexyl-9H-fluoren-2-yl)benzene end-capped with carbazole and diphenylamine units: solution-processable, high T-g hole-transporting materials for organic light-emitting devices
Zou, Y; Ye, T; Ma, D; Qin, J; Yang, C
| HERO ID | 1596750 |
|---|---|
| In Press | No |
| Year | 2012 |
| Title | Star-shaped hexakis(9,9-dihexyl-9H-fluoren-2-yl)benzene end-capped with carbazole and diphenylamine units: solution-processable, high T-g hole-transporting materials for organic light-emitting devices |
| Authors | Zou, Y; Ye, T; Ma, D; Qin, J; Yang, C |
| Journal | Journal of Materials Chemistry |
| Volume | 22 |
| Issue | 44 |
| Page Numbers | 23485-23491 |
| Abstract | Two new hole-transporting materials, namely HFB-Cz and HFB-Dpa, were designed and synthesized by attaching carbazole and diphenylamine units to the hexakis(9,9-dihexyl-9H-fluoren-2-yl)benzene (HFB) core via Buchwald-Hartwig coupling reaction. The long alkyl chain and core rigidity endow these compounds with good solution processability and high thermal stability. HFB-Cz and HFB-Dpa exhibit significantly high glass transition temperatures (225 and 154 degrees C) relative to widely used hole-transporting materials, such as N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4, 4'-diamine (TPD, 65 degrees C) and 1,4-bis((1-naphthylphenyl)amino)biphenyl (NPB, 96 degrees C). Solution-processed green OLED devices using HFB-Cz and HFB-Dpa as hole-transporting materials exhibit very high efficiencies with a maximum current efficiency up to 6.2 cd A(-1). These efficiencies are substantially higher than the NPB-based control device, and are among the highest for the hole-transporting materials in similar device configuration. |
| Doi | 10.1039/c2jm35618j |
| Wosid | WOS:000310934400025 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Source: Web of Science WOS:000310934400025 |
| Is Public | Yes |