Fused Polycyclic Emission Layer for OLED Efficiency and Lifetime

The patent modifies molecular parameters of the organic compound by introducing a fused polycyclic core structure with specific substituent groups at controlled positions. This changes the electronic structure and steric properties of the material, enabling simultaneous improvement in luminous efficiency and service life through optimized HOMO-LUMO energy levels and reduced molecular aggregation

The invention creates a composite molecular structure by combining a fused polycyclic core (such as dibenzofuran, dibenzothiophene, carbazole, or fluorene) with electron-donating or electron-withdrawing substituent groups. This composite structure achieves synergistic effects that improve both luminous efficiency and device stability

The patent applies preliminary anti-action by designing the fused polycyclic compound structure to preemptively prevent exciton quenching through built-in steric hindrance from substituent groups. These groups create spatial separation between adjacent molecules, preventing harmful intermolecular interactions before they can occur during device operation

The invention uses organic compounds with carefully designed lifetimes that are sufficient for device operation but short enough to avoid accumulation and quenching effects. The fused polycyclic structure provides stable yet transient excited states that emit light efficiently before decaying, preventing energy loss through quenching