Dr. Liu Di
Dr. Liu Di
Dalian University of Technology, China
Title: Polymeric and Dendritic Materials for Organic Light-Emitting Diodes
Following the conventional organic small molecules that are suitable for vacuum evaporation, polymers and dendrimers are solution-processible light-emitting materials that are used in organic light-emitting diodes (OLEDs).1 Solution processibility is a precious merit for OLED materials due to the features of simpleness, low cost, and suitability for large scale production. Dendrimers possess exact molecular structures like small molecules, which is favorable to guarantee the high repeatability and good performance. However, they usually suffer from the complicated syntheses especially when the generation is high. Polymers are not only solution processible, but also possibly prepared via one-step reaction procedure by mixing all the necessary reagents. But polymers are sometimes troubled by poor purity and repeatability. For both dendrimers and polymers used as OLEDs functional materials, smart molecule designing are necessary to tune and balance their optoelectronic parameters and thus to optimize their performance in OLEDs. In this lecture, various kinds of dendrimers and polymers developed in the authors’ group for OLEDs application will be presented,2,3 with the focus on those use as light-emitters and charge-transporting hosts. For the light-emitting dendrimers, non-doping feature and the site-isolation effect on the emissive core will be the major issues in the process of molecular designing. For the dendritic host materials, the molecular configuration-property-device performance relationships will be mainly discussed. For light-emitting polymers, their applications as bipolar charge-transporting hosts and solution-processed thermal activated delayed fluorescence emitters will be focused.