Iridium Complex Compound for Organic EL Devices

The patent modifies the chemical structure of iridium complex compounds by introducing specific substituents (such as alkyl groups at positions 2 and 6 of the phenyl ring, or fused ring structures like dibenzofuran and dibenzothiophene) to change the solubility parameters and molecular packing behavior, thereby preventing aggregation while maintaining high luminous efficiency

The patent creates composite luminescent layer materials by combining modified iridium complex compounds with host materials (such as Alq3, BCP, and polymer matrices) to achieve synergistic effects where the host material provides structural stability and the iridium complex provides high quantum efficiency phosphorescence

The patent introduces solubility-enhancing substituents (bulky alkyl groups like tert-butyl, alkoxy groups, and fused aromatic rings) that modify the molecular structure to improve solubility in common organic solvents, enabling solution processing while preventing crystallization during film formation

The patent uses host materials and polymer matrices as intermediaries to disperse and stabilize the iridium complex compounds in solution, preventing direct aggregation of the phosphorescent molecules while maintaining their luminescent properties during the coating process

The patent applies different types of substituents at specific positions of the ligand structure: bulky groups at positions 2 and 6 for solubility, electron-withdrawing groups at position 4 for stability, and fused ring structures at positions 3 and 5 for both solubility and enhanced complex stability, creating local functional zones with different properties

The patent combines multiple ligand types (phenylpyridine with specific substituents, carbazole derivatives, triazole compounds) in coordinated complexes to achieve synergistic effects where different ligand components contribute different properties (solubility, stability, luminescence) to the overall complex