Quantum Dot Composition Curing Uniformity via Segmented Cross-linking

The cross-linking agent is divided into multiple functional moieties (Formula A with four or more groups) that can independently cross-link with quantum dot surface ligands. This segmentation allows each moiety to contribute to curing at different locations, achieving uniform curing degree throughout the quantum dot layer while maintaining a manageable molecular structure.

The invention uses a composite cross-linking agent structure combining multiple cross-linkable groups (Formula A) with a central connector (Formula 1 or 2). This composite approach integrates different cross-linking functionalities into a single molecule, achieving both high curing degree and structural feasibility without excessive complexity.

The solvent system is segmented into three distinct solvents with different properties: first solvent (cyclohexylbenzene) for quantum dot dissolution, second solvent (hexadecane) with higher boiling point for controlled evaporation, and third solvent (octylbenzene) for cross-linking agent solubility. Each solvent performs a specific function, and their combined action achieves uniform quantum dot layer formation and curing.

The mixed solvent system performs multiple functions simultaneously: dissolving quantum dots, dissolving cross-linking agent, controlling evaporation rate, and facilitating uniform film formation. This multi-functional solvent system achieves superior layer uniformity and curing degree while managing the added complexity through functional specialization.

The solvent system parameters are optimized by selecting specific compounds with defined boiling points and surface tensions. The second solvent has a higher boiling point than the first, creating a controlled evaporation sequence that prevents rapid drying and agglomeration. The third solvent's specific structure (Formula 3) provides appropriate solubility parameters to maintain quantum dot dispersion while enabling cross-linking.

The mixed solvent system acts as an intermediary between the quantum dot precursors and the final cured layer. It provides a controlled environment for uniform distribution, prevents premature aggregation, and enables gradual curing. The solvent mixture mediates the transition from dissolved precursors to uniform quantum dot layer, maintaining photoluminescence efficiency throughout the process.