Emission Layer Composite for Light-Emitting Device Efficiency

The emission layer employs a composite structure combining inorganic semiconductor nanoparticles (first material) with organic compounds (second material). The inorganic semiconductor provides efficient carrier recombination and exciton generation, while the organic compound acts as a host matrix that facilitates charge transport and stabilizes the inorganic particles. This composite approach resolves the contradiction by achieving high light emission efficiency through the synergistic properties of both material types while maintaining a manageable device structure.

The patent optimizes the energy level parameters of the materials used in the emission layer. The inorganic semiconductor is selected with specific band structure parameters that align with the organic host, enabling efficient charge injection at lower voltages. The organic compound's HOMO-LUMO levels are tuned to match the inorganic semiconductor's band edges, reducing energy barriers and minimizing the driving voltage required while maintaining high light emission efficiency.

The patent employs inorganic semiconductor nanoparticles that can be synthesized through straightforward chemical methods and incorporated into the emission layer as discrete, replaceable units. These nanoparticles are produced using conventional chemistry techniques with readily available precursors, and their integration into the organic host matrix follows simple processing protocols. This approach maintains ease of manufacture while achieving high light generation efficiency, as the nanoparticles can be prepared in advance and incorporated without complex assembly steps.