3 2 OSMIUM COMPLEXES COMPRISING THREE DIFFERENT BIDENTATE LIGANDS AND METHOD OF MAKING THE SAME

摘要

Novel emitter compounds having the formula Os(L 1 )(L 2 )(L 3 ) and novel methods of preparing such compounds are disclosed. In the above formula Os(L 1 )(L 2 )(L 3 ), L 1 , L 2 and L 3 are independently bidentate ligands. The method comprises the steps of (a) reacting a precursor of ligand L 1 with an osmium precursor to form a first intermediate product in which ligand L 1 is coordinated to osmium, wherein the osmium precursor has the formula OsH x (PR 3 ) y , wherein x is an integer from 2 to 6, y is an integer from 2 to 5, and R is selected from the group consisting of aryl, alkyl and cycloalkyl; (b) reacting the first intermediate with a reducing agent to form an Os(II) second intermediate; (c) reacting the second intermediate product with a coordinating solvent to form a third intermediate product; and (d) reacting the mixture of precursors of ligands L 2 and L 3 with said third intermediate product.