Abstract
Dendrimers are an attractive class of solution-processible materials for organic LEDs. Two aspects of recent dendrimer research are reported, giving new insight into the operation of these materials and devices made from them. The first involves the study of triplet-triplet annihilation using intensity-dependent time-resolved luminescence measurements. The dependence of triplet-triplet annihilation on molecular size is studied and suggests annihilation is the result of a Dexter process. The second aspect of the research reported shows how the structure of the dendrimer can be modified so that a host material is not required.