Fused Ring Polycyclic Compound for Blue OLED Color Purity and Lifetime

The patent changes the molecular structure parameters of organic materials by introducing fused 6-membered ring structures (such as triazine, pyrimidine, pyridine rings) to develop new compounds with optimized HOMO-LUMO energy gaps. This structural parameter change enables simultaneous achievement of high color purity (narrow emission spectrum) and long device lifetime by improving material stability and reducing degradation

The patent employs composite material strategies by combining electron-deficient fused ring cores with electron-rich substituent groups (such as carbazole, triphenylamine, dibenzofuran) to create compounds with balanced charge transport properties. This composite molecular design achieves both high color purity through controlled energy levels and extended lifetime through improved charge balance and reduced exciton-polaron annihilation

The patent optimizes the energy level parameters of organic materials by designing fused ring structures with specific electron-deficient cores and electron-rich substituents. This parameter optimization achieves narrow emission bandwidths for high color gamut while maintaining appropriate HOMO-LUMO gaps for efficient charge injection and transport, thus improving both color purity and device efficiency simultaneously

The patent applies local quality differentiation by introducing specific functional groups at different positions of the fused ring core. The electron-deficient core provides narrow emission for high color gamut, while electron-rich substituents provide efficient charge transport. This spatial differentiation of molecular properties achieves both high color purity and high efficiency

The patent changes the molecular parameters by incorporating fused 6-membered ring structures (triazine, pyrimidine, pyridine) that provide rigid, planar cores with high structural symmetry. This structural parameter change reduces vibrational modes and minimizes geometry relaxation between ground and excited states, thereby reducing Stokes shift while maintaining reasonable molecular complexity

The patent converts the potential harm of increased molecular complexity into a benefit by strategically designing fused ring structures. The added structural complexity of fused rings provides rigid planarity and extended conjugation that actually reduce Stokes shift through minimized geometry relaxation, while the systematic design keeps synthesis feasible