Polytriphenylene Dendrimers: A Unique Design for Blue-Light- Emitting Materials

摘要

In the past decade, light-emitting dendritic materials have attracted much interest, owing to their application as emissive layers in organic light-emitting diodes (OLEDs). This class of materials allows the advantages of small molecules, such as anthracene, phenanthrene, or pyrene to be combined with those of conjugated polymers, such as polyfluorenes or poly(para-phenylene vinylene)s. To date, the most promising design for dendrimer light-emitting-diode (DLED) materials has comprised a fluorescent or a phosphorescent core and a conjugated, but non-emissive, dendron shell to keep the emissive units separated, thus avoiding excimer formation and quenching effects. The utilization of conjugated dendrons facilitates sufficient charge transport, which is a necessary premise for efficient devices. One of the biggest advantages of using dendritic molecules is the variety of possible combinations of cores, dendrons, and surface groups.