OLED Functional Layer Material for Electron-Stable Hole Transport

The patent employs composite materials by combining phenanthroline groups (electron acceptors) with triarylamine groups (electron donors) in a single functional layer material. This composite structure allows the material to simultaneously achieve good hole transport efficiency from the triarylamine groups while the phenanthroline groups provide electron stability and prevent electron attacks on carbon-nitrogen bonds, thus resolving the contradiction between productivity and reliability.

The patent applies local quality by assigning different functional groups to different regions within the same functional layer. The triarylamine groups are positioned to facilitate hole transport, while the phenanthroline groups are positioned to stabilize electrons and prevent degradation. This spatial differentiation of functional properties within the material structure allows simultaneous optimization of both hole transport efficiency and electron stability.

The patent uses composite materials with specific molecular structures containing both phenanthroline and triarylamine groups to extend service life. Although the molecular structure is more complex, this complexity is inherent in the functional material design and does not translate to increased device structure complexity. The composite material provides electron stability that prevents attacks on carbon-nitrogen bonds, thereby extending device service life without requiring more complex device architecture.

The phenanthroline groups act as intermediary elements between the triarylamine groups and the electron attacks. The phenanthroline groups receive electron density through their electron-accepting properties, thereby protecting the carbon-nitrogen bonds from direct electron attacks. This intermediary mechanism extends service life while maintaining a relatively simple overall device structure.