Core Mass-Production Issues and Comprehensive Mitigation Strategies for PiG (Phosphor in Glass) (Item 7)

Customize dedicated glass matrices matched to different phosphor varieties to eliminate interfacial corrosion and thermal degradation at the source:

• High-Y/Al low-interdiffusion borosilicate glass for YAG phosphors;
• Ultra-low-temperature alkali-free fluorophosphate glass for red nitride and KSF phosphors.

Implement a unified full workflow: vacuum drying → wet ball milling for homogeneous dispersion → vacuum defoaming & granulation → particle classification and sieving.

This standardized process fundamentally solves three major mass-production defects: bubbles, powder segregation and batch color inconsistency.

Prioritize Rapid Thermal Annealing (RTA) under inert protective atmosphere to cut high-temperature dwelling time drastically.

Synchronously deploy furnace temperature homogenization, negative-pressure gas evacuation and staged heating/cooling profiles to balance production yield and optical performance.

Adopt cold isostatic pressing or segmented hydraulic compression to enhance green body densification.

Carry out all material handling inside dust-free workshops, and regularly clean furnace cavities and sintering molds to eliminate inclusion stones and foreign impurity defects.

Conduct optical sampling tests for every furnace batch, and perform automatic sorting of finished products by thickness and color coordinates.

Real-time reverse adjustments are applied to sintering and powder blending parameters to stabilize cross-batch consistency of PiG products.