Low-Refractive-Index Hole-Transport Compound for OLED Outcoupling

The patent applies local quality by creating distinct regions within the EL layer with different refractive indices. The first EL region has a first refractive index optimized for carrier transport, while the second EL region has a second refractive index optimized for light outcoupling. This spatial differentiation allows each region to perform its specialized function without compromising the other, resolving the contradiction between reducing reflection loss and maintaining carrier-transport property.

The patent employs composite materials by combining different organic compounds with distinct refractive indices in separate EL regions. The first EL region uses a material with higher refractive index for efficient carrier transport, while the second EL region uses a material with lower refractive index for enhanced light extraction. This composite approach allows the device to simultaneously achieve both carrier-transport efficiency and reduced reflection loss.

The patent segments the EL layer into multiple regions, each utilizing organic compounds with different molecular structures. The first EL region employs compounds with unsaturated bonds for superior carrier transport, while the second EL region uses compounds with saturated bonds for lower refractive index. This segmentation allows the device to harness the advantages of both compound types in their respective optimal environments.

The patent implements local quality by assigning different molecular characteristics to different spatial regions. The first EL region is characterized by unsaturated organic compounds providing high carrier mobility, while the second EL region is characterized by saturated organic compounds providing low refractive index. This localized optimization resolves the contradiction between carrier-transport property and refractive index.