| 초록 |
A fluorene is one of the choice for the blue. However, fluorene derivatives show an excimer formation, resulting in color impurity and shortening in the lifetime of OLED device. Over the last years polyfluorenes have emerged as a promising class of conjugated polymers. This band which can also be found in photoluminescence emission upon photooxidation of the polymer has been attributed to aggregation and excimer formation in the material. In an efforts to reduce the excimer formation, 9,9-spirobifluorene compounds have been introduced as EL materials. A series of 9,9-spirobifluorene derivatives containing symmetrically substituted phenylene groups has been used for blue light emitting materials. However, even though they are good candidates for the blue OLED, they still have a problem in terms of a color purity and material stability for real application in device. Here we synthesis cyclospiropentaphenanthrene that would be expected a good solubility and no keto-effect. |
