| dc.description.abstract | The development of light emitting polymers has been the subject of intense academic and industrial research. Conjugated polymers have dominated solution-processed OLEDs, and device with good efficiencies have been reported. On the other hand, conjugated dendrimers have a number of potential advantages over conjugated polymers as OLEDs. First, they can be produced via a modular synthesis giving a greater flexibility over controlling the properties. Second, the processing and electronic properties can be optimized independently. Hence, OLEDs in combination with dendritic macromolecules characteristics show great potential as the next generation of OLED and has receive attention. Recently, solution-processible dendrimers have been developed for use as the light-emitting layer in OLEDs.
In current research, light emitting materials with dendrimer side chain in the 9-position of fluorene unit has been synthesized. This polymer bears cylinder shape; which consists of surface group, triazines dendron, and the fluorene core（the PLED backbone is the core of the dendrimer）; similar to spherical dendrimers. However, the dendritic surface group (side chain) yields favorable processing properties including improved solubility and thermal stability. We expect that dendritic side chain will prevent π-stacking and reduces polyfluorene aggregation. Furthermore, dendritic side chain served as chromophore which also shields the PF main chain for undesirable side effects such as oxidation, degradation and impure energy transfer. By this design, the structure and conformation will ensure superb electro-optic properties. Molecular simulation (AM1, Zindo, HF) of the dendritic PLED confirms the correlations between the structure, conformations and photo physical properties. | en_US |