| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 176739 | Dyes and Pigments | 2013 | 11 Pages |
A series of twisted fluorenyl anthracenes linked by a rigid sp3-hybridized carbon atom, containing an end-capping aryl substituent at either the C2-position of fluorene or at the C10-position of anthracene, have been synthesized and characterized. These materials exhibited good thermal stabilities and amorphous properties. Theoretical calculations and X-ray diffraction studies revealed that the six blue emitters possess non-coplanar structures to suppress intermolecular interactions. The relationship between the chemical structures with different end-capping groups and the electroluminescent properties has been investigated. Organic light-emitting diodes utilizing 9-(2-phenyl-9H-fluoren-9-yl) anthracene as the emitter exhibited deep-blue emissions CIE x, y (0.166, 0.153) with a current efficiency of 1.47 cd/A, external quantum efficiency of 1.84% at 20 mA/cm2 and a maximum brightness of 3013 cd/m2 at 11 V. It was found that the introduction of the aryl substituents to the C2 position of fluorene could improve the performance of OLEDs based on C9-fluorenyl anthracenes.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Six new C9-fluorenyl anthracenes were prepared. ► All have high glass transition temperatures above 100 °C. ► Better performance of OLEDs based on C9-fluorenyl anthracenes with C2-substituents. ► An efficiency (1.47 cd/A) and an external quantum efficiency (1.84%) at 20 mA/cm2.
