Iridium Complex Composition for OLED Efficiency and Lifespan

The patent applies parameter changes by modifying the chemical structure of iridium complex compounds, specifically changing ligand types (combining cyclometalating ligands with N^N-type ligands), oxidation states (Ir(III) and Ir(V)), and molecular configurations to achieve both high luminescence efficiency and long lifespan in OLEDs

The patent uses composite materials by creating heteroleptic iridium complexes that combine different ligand systems (cyclometalating ligands with N^N ligands such as bipyridine, phenanthroline, or their substituted derivatives) to achieve synergistic effects that improve both luminescence efficiency and device stability

The patent changes key parameters including the oxidation state of iridium (Ir(III) and Ir(V)), the type of ligands (combining cyclometalating ligands with N^N ligands), and molecular structures to achieve enhanced device performance and durability simultaneously

The patent applies local quality by optimizing specific regions of the iridium complex molecule, such as using electron-donating or electron-withdrawing groups on ligands (e.g., substituted bipyridine or phenanthroline derivatives) to locally enhance electronic properties that contribute to overall device performance and stability