Multilayer Polymer Composite for Quantum Dot Encapsulation

The patent employs a composite encapsulation structure consisting of a polymer matrix combined with inorganic oxide layers (such as alumina, silica, or titania) formed on the quantum dot surface. This composite approach creates a hierarchical protection system where the inorganic layer provides barrier properties against oxygen and moisture penetration, while the polymer matrix provides mechanical protection and chemical stability. The synergistic combination resolves the contradiction by maintaining stability through the polymer while blocking harmful factors through the inorganic barrier layer.

The inorganic oxide layer acts as an intermediary barrier between the quantum dots and the polymer matrix environment. This intermediate layer prevents direct contact between the quantum dots and harmful substances (oxygen and moisture) that would otherwise penetrate through the polymer matrix. The mediator layer thus protects the quantum dots from photo-oxidation while allowing the polymer to maintain its stabilizing function.

The patent segments the protective function into two distinct components: organic ligands (such as long alkyl chains) that provide solubility and dispersion, and an inorganic oxide shell that provides protection against photo-oxidation and moisture. This segmentation allows each component to specialize in its respective function without compromising the other, resolving the contradiction between solubility and protection.

The quantum dot structure combines organic ligands with an inorganic oxide shell to create a composite nanoparticle. The organic ligands ensure solubility in various solvents and monomers, while the inorganic oxide shell provides a protective barrier against photo-oxidation and moisture penetration. This composite structure resolves the contradiction by integrating both solubility-enhancing and protection-providing functionalities.

The encapsulation structure is segmented into functional layers: an inner inorganic oxide layer that provides barrier protection against oxygen and moisture, and an outer polymer matrix that provides mechanical protection and chemical stability. This segmentation improves protection effectiveness while maintaining reasonable structural simplicity through the clear functional division of layers.

The patent employs thin film structures for the inorganic oxide layer formed on the quantum dot surface, followed by a polymer matrix encapsulation. These thin films provide effective barrier properties against oxygen and moisture penetration while maintaining a compact and relatively simple overall structure. The flexible polymer shell accommodates the rigid inorganic layer while providing mechanical protection.