Synthesis and Characterization of A New Adamantane-Based Host Molecule for Solution-Processable TADF-OLEDs
발표자
()
초록
내용
To achieve highly efficient organic light-emitting diodes (OLEDs), a host material is an essential component. Host materials should have a larger bandgap compared to dopants. Specifically, the triplet energy of the host for phosphorescence- or TADF-OLEDs is very important. Most hosts with high T1 have low molecular weight and poor thermal stability. When using a conjugated bridge to overcome this, there is a disadvantage as T1 is lowered or the HOMO and LUMO can be affected. Therefore, we need new design strategies to resolve these host-related issues. In this study, we designed and synthesized a new host which has an adamantane unit as a sp3-type cyclized aliphatic group. It showed higher thermal stability and similar energy levels compared to a host without an adamantane group. It exhibited good solubility and film-forming property resulting in fine surface morphology. These results showed the significant potential of the host material for use in solution-processed TADF-OLEDs.