Summary
UCLA researchers have developed a novel method to using boron clusters ligands for light emitting diode materials. This is the first report of the ligand 1,1'-bis-o-carborane (bc) bound to Pt(N^N). Both C-Pt symmetrical isomers and C-Pt/B-Pt asymmetric isomers can be synthesized. Background An organic light- emitting diode (OLED) is a LED in which the emissive electroluminescent layer is a film of organic compound that emits light in response to an electric current. OLEDs have shortened lifetimes due to reasons such as ligand aggregation and lack of steric bulk. blue OLEDs have short lifetimes vs red and green partly because the higher energy blue light makes it difficult to design stable deep-blue emitters. Intermolecular aggregation and a lack of steric bulk are fundamental issues that must be addressed with the Pt(II) phosphorescent emitters. This innovation is the synthesis and characterization of a new complex that reduces these undesired intermolecular (Pt-Pt) interactions. Blue emission is achieved with a fluoride-free framework. No technology exists that uses Boron Clusters with 1,1'-bis-o-carborane (bc) in OLED and photoemission applications. By decreasing the undesired interactions the result is for increased bulk and more stable and tunable transition phase stability.
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