Organometallic Compound for OLED Stability and Efficiency

The patent modifies the molecular structure parameters of organometallic compounds by introducing rigid ligand frameworks with specific geometric configurations. This structural parameter change prevents excimer formation by maintaining fixed molecular distances and orientations, thereby simultaneously improving stability and preventing energy loss through excimer-related non-radiative decay pathways.

The patent employs composite organometallic compounds combining multiple ligand types (e.g., cyclometalating ligands with auxiliary ligands) around metal centers. This composite structure creates steric hindrance and rigidifies the molecular framework, preventing molecular aggregation that leads to excimer formation, thus improving both stability and luminescence efficiency.

The patent divides the ligand structure into multiple rigid segments (e.g., separate cyclometalating ligand and auxiliary ligand components) that are connected through the metal center. This segmentation creates a rigid three-dimensional framework that maintains high luminescence intensity while preventing molecular degradation over time, thereby extending device lifespan.

The patent utilizes ligands with curved or three-dimensional geometric structures (e.g., chelating ligands forming rigid rings) around the metal center. This spherical/curved geometry provides steric protection and rigidifies the complex, maintaining high luminescence output while significantly improving operational stability and lifespan compared to linear or flexible structures.