Condensed Cyclic Compound for OLED Efficiency and Heat Resistance

The patent employs composite materials by combining the condensed cyclic compound (Formula 1) with specific substituents (Ar1, Ar2, Ar3 groups) to create a material that simultaneously achieves high luminescence efficiency and effective charge transport. The composite structure integrates electron-rich heterocyclic groups with carbocyclic or heterocyclic aromatic groups, creating a synergistic effect that resolves the contradiction between structural simplicity and luminescence performance.

The patent applies parameter changes by modifying the molecular structure of the light-emitting material through systematic variation of substituent groups (Ar1, Ar2, Ar3) and their positions on the condensed cyclic core. This structural parameter optimization enhances electron density and HOMO-LUMO gap characteristics, thereby improving luminescence efficiency and charge transport properties while maintaining the core device structure.

The patent resolves this contradiction by designing a composite molecular structure where electron-rich heterocyclic groups (increasing electron density for luminescence) are balanced with rigid, thermally stable carbocyclic or heterocyclic aromatic groups. This composite architecture maintains high electron density for efficient luminescence while the aromatic framework provides thermal stability and structural rigidity, preventing the deterioration of heat resistance.

The patent applies local quality by assigning different functional characteristics to different parts of the molecule: the condensed cyclic core and substituent groups (Ar1, Ar2, Ar3) are designed with specific electron-donating or electron-withdrawing properties to optimize electron density in the luminescence center, while peripheral groups provide thermal stability and structural support. This spatial differentiation of functional properties allows simultaneous optimization of luminescence efficiency and thermal stability.