Electron Transport Layer Compounds for High-Efficiency OLEDs

The patent applies parameter changes by modifying the molecular structure of organic compounds in the electron transport layer. Specifically, it introduces compounds with particular molecular weights, functional groups, and structural configurations (such as those containing nitrogen-containing six-membered rings or specific substituent patterns) to optimize both lifespan and luminous efficiency simultaneously.

The patent employs composite materials by combining multiple organic compounds with complementary properties in the electron transport layer. It uses host materials and guest materials together, where the host provides structural stability and the guest enhances electron transport, achieving synergistic effects that improve both lifespan and luminous efficiency.

The patent applies local quality by introducing specific functional groups and molecular structures at particular positions within the organic layer. It uses compounds with specific local chemical characteristics (such as electron-donating or electron-withdrawing groups at defined locations) to enhance luminous efficiency in the electron transport layer while maintaining overall material stability.

The patent modifies material parameters including molecular weight, functional group composition, and structural configuration to achieve an optimal balance between luminous efficiency and stability. It specifically uses compounds with controlled molecular weights and specific functional group arrangements that simultaneously improve efficiency and maintain device lifespan.