Organic Electric Element Charge Generating Layer for Display Efficiency

The patent employs composite organic materials comprising multiple layers with different chemical compositions and functional properties. The organic layer includes a hole transport layer, emission layer, and electron transport layer, each with specific compounds selected to optimize charge transport and light emission. This composite structure resolves the contradiction by achieving high reliability through material optimization while maintaining manufacturability through systematic layer design.

The patent applies local quality by assigning specific functional properties to different regions of the organic layer. Each layer is composed of materials with tailored properties: the hole transport layer uses materials with high hole mobility, the emission layer uses phosphorescent or fluorescent compounds for light generation, and the electron transport layer uses materials with high electron mobility. This localized optimization of material properties achieves high lifespan and efficiency while maintaining overall device manufacturability.

The patent segments the organic layer into distinct functional layers: a hole transport layer, an emission layer, and an electron transport layer. Each layer is optimized for its specific function, allowing high light emission efficiency through specialized material selection in each segment while managing overall complexity through modular design. The charge generating layer is further segmented into multiple sub-layers with different compounds to optimize charge injection and transport.

The patent employs materials and layer structures that perform multiple functions simultaneously. For example, the emission layer serves both as a recombination zone for charge carriers and as the light-generating medium. The charge generating layer simultaneously performs charge injection and charge transport functions. This multi-functionality approach achieves high light emission efficiency without proportionally increasing structural complexity.

The charge generating layer is constructed as a composite structure with multiple sub-layers, each containing specific compounds with tailored properties. The first charge generating layer includes a hole transport compound and a phosphorescent dopant, while the second charge generating layer includes an electron transport compound and a fluorescent dopant. This composite structure achieves high luminous efficiency by optimizing charge injection and transport while managing complexity through systematic material selection.

The patent optimizes the charge generating layer by carefully selecting compounds with specific energy levels, mobility values, and stability parameters. The HOMO and LUMO energy levels of the compounds are matched to achieve efficient charge injection, while the mobility parameters are optimized for effective charge transport. This parameter optimization approach achieves high productivity in terms of luminous efficiency while maintaining reasonable structural complexity.