Pyrimidine Derivative Electron Transport Layer for Organic EL

The patent modifies the molecular structure of electron transport materials by introducing specific substituents (such as fluorine atoms, aromatic hydrocarbon groups, and heterocyclic groups) at defined positions on the pyrimidine ring. This structural parameter change enables the material to simultaneously achieve high hole blocking capability through increased work function and improved thermal stability through enhanced molecular rigidity and intermolecular interactions.

The patent develops composite electron transport materials based on pyrimidine derivatives that integrate multiple functional groups with complementary properties. The core pyrimidine structure provides electron transport capability, while attached aromatic and heterocyclic groups contribute to thermal stability and hole blocking properties, creating a multifunctional composite material system.

The patent applies local quality modification by introducing specific functional groups at predetermined positions on the pyrimidine ring structure. For example, electron-withdrawing groups are placed at positions that enhance electron affinity and mobility locally, while maintaining overall molecular symmetry and simplicity. This localized optimization achieves high electron mobility without requiring complex overall molecular architecture.

The patent segments the electron transport material function into distinct modular components: the pyrimidine core provides the electron transport pathway, while attached aromatic and heterocyclic groups provide thermal stability and solubility. This segmentation allows each component to be optimized independently for its specific function while maintaining overall material simplicity.