Quantum Dot Print Material Composition for Stable Particle Dispersion

A dispersant is introduced as an intermediary substance between the solids (quantum dots and light-scattering particles) and the matrix material. The dispersant has a surface composition matched to the solids and provides steric stabilization, preventing aggregation while maintaining dispersion during storage and printing operations.

The print material is formulated as a composite system containing multiple components: vinylic molecules, cross-linker molecules, quantum dots, light-scattering particles, and dispersant. This composite structure allows each component to perform its specific function while working together to achieve both stability and printability.

The dispersant acts as a mediator that adsorbs to the particle surfaces and extends into the matrix material, creating a steric barrier that prevents particle settling and separation. This allows the mixture to remain stable during storage while maintaining its printable properties.

The viscosity of the curable material is adjusted to an optimal range (5-500 cP) that balances printability with resistance to particle settling. The dispersant concentration is also optimized to provide sufficient stabilization without compromising the printing process.

The dispersant provides steric stabilization that becomes increasingly important at higher solid concentrations. By adsorbing to particle surfaces and creating physical barriers, the dispersant prevents aggregation even when particles are closely spaced at high loading levels.

The dispersant creates localized protective layers around each particle surface, ensuring that even at high concentrations where particles are close together, each particle maintains its individuality and does not aggregate with neighbors.