Mixed Composition Electron Transport Layer for Light-Emitting Devices

The patent applies composite materials by combining metal oxide nanoparticles with organic compounds (such as zinc oxide with triphenylamine or titanium dioxide with carbazole) in the electron transport layer. This composite structure allows the metal oxide to provide electron transport capability while the organic compounds fill oxygen vacancies and reduce electron trap sites, thereby resolving the contradiction between electron transport capability and oxygen vacancy harm

The patent changes the chemical and physical parameters of the electron transport layer by introducing organic compounds with specific functional groups that can donate electrons to fill oxygen vacancies in metal oxide nanoparticles. This parameter change transforms the defective metal oxide structure into a more complete electronic structure, reducing electron trapping while maintaining transport capability

The patent uses composite materials consisting of metal oxide nanoparticles combined with organic hole-blocking compounds. The metal oxide enhances electron injection efficiency while the organic compounds create a energy level barrier that blocks hole leakage. This composite structure resolves the contradiction by allowing simultaneous achievement of high electron injection and low hole leakage

The patent applies local quality by creating different functional zones within the electron transport layer. The metal oxide nanoparticles are distributed to provide electron injection enhancement at specific locations, while organic compounds are positioned to block hole leakage in other regions. This spatial differentiation allows the layer to simultaneously perform both functions without interference