Fused Polycyclic Compounds for Blue TADF Light Emitting Devices

The patent modifies molecular parameters of the organic compound by introducing specific fused polycyclic structures with electron-donating and electron-withdrawing groups, changing the energy level parameters (HOMO-LUMO gap, triplet-singlet energy difference) to achieve both high luminous efficiency and long service life simultaneously

The invention creates a composite luminescent material system by combining the fused polycyclic core structure with specific substituent groups (electron-donating groups like carbazole, electron-withdrawing groups like pyridine), forming a composite molecular structure that achieves synergistic effects for improved performance

The patent applies local quality by introducing specific functional groups at specific positions on the fused polycyclic core structure - electron-donating groups at certain positions and electron-withdrawing groups at others, creating localized electronic properties that enhance both efficiency and stability

The invention develops organic compounds with extended service life that can operate for prolonged periods without degradation, effectively transforming from short-living to long-living materials through structural optimization