Events
Searching For Deep Blue Phopshorescence For Organic Light-Emitting Diodes
| Date: | Wednesday 3 September 2008 16:00 - 17:00 |
| Location: | UPC (Engineering 148a) |
Professor Paul Burn from the Centre for Organic Photonics & Electronics, University of Queensland, Queensland, Australia, 4072
Innovation in materials has played a crucial role in development of organic light-emitting diodes, and most research has concentrated either on small organic molecules or conjugated polymers. We have pursued an alternative approach to materials for LEDs based on conjugated dendrimers. These molecules consist of a core, conjugated dendrons (branches) and surface groups, and by suitable choice of these components, extremely efficient solution-processed LEDs can be made. In addition, dendrimers have proved convenient model systems in which to study important issues for all OLED materials such as the role of intermolecular interactions. One of the key challenges in materials development is the creation of compounds that emit saturated blue phosphorescence at room temperature. While small molecules based in iridium(III) complexes with carbene or phenyltriazolyl based ligands have been reported a question remains as to whether it is possible to design optimal hosts that are require to prevent the intermolecular interactions of the small molecule emissive chromophores within a film. In this presentation we will report recent advances in dendrimer design that enable the production of solution processed films that give deep blue phosphorescence with high photoluminescence quantum yields and will discuss how the dendron structure can effect the emissive properties of the films.
