One-step extruding method for fabricating perovskite quantum dot light diffusers

All-inorganic perovskite quantum dots (PQDs) exhibit excellent physics properties and application prospects in the field of LED lighting applications and display devices. However, poor long-term stability to light irradiation, water, heat, and oxygen hinders the further development of commercialization. Using polymer plastics, such as PS (polystyrene), PC (polycarbonate), PMMA (polymethyl methacrylate), PP (polypropylene), as the matrix along with proper Cs, Pb and halogen (X) sources as perovskite precursors, CsPbX3 PQDs/polymer composites can be synthesized via a solvent-free and in-situ polymeric melt encapsulation method. Special attention was paid to the effects of growth conditions on the photoluminescent quantum yield (PLQY) of the composites. The optimized CsPbX3 PQDs/polymer composite demonstrated excellent performance with more than 90% PLQY and 22 nm full width at a half[1]maximum (FWHM) for green and 35 nm FWHM for red. Particularly, we combined this in-situ melting synthesis technology with industrial production, and used a melting extruder to directly fabricate perovskite quantum dot optical diffuser products for backlight display. Under the protection of multi-layer structure, the PQD diffusers exhibited remarkable long-term stability. This study provides a novel solvent-free and in-situ synthesis route for fabricating diffuser products, which is quite friendly to industrialization and commercialization for perovskite materials.