Organic Light-Emitting Materials and Devices, 2nd Edition

2.3.5  End-Capped Polyfluorenes

The very first and obvious reason for introducing the end groups, terminating the polymer chain, was to replace reactive functionalities (halogen, boronic acid, or metal–organic group), which can quench the fluorescence or decrease the stability of the material. Second, varying the feed ratio of the end-capping reagent, one can control the molecular weight of the polymer. Some examples of such utilization of the end-capping approach have been demonstrated in the previous section. The third important reason for end capping is tuning the optoelectronic properties of the polymer by electronically active end cappers. The most important examples of functional end-capped PFs, such as the hole-transport or electron-transport ...