The Synthesis And Properties Of High Refractive Index Of Silicone Resin For High Power LED Encapsulation

As a fourth-generation lighting source, especially in high-power LED lights, LED is gradually replacing the incandescent, fluorescent, neon lights.LED is more widely used in the world and it will be the core of the future lighting light source. Packaging technology is the key to the practical application of LED, packaging material seriously affect the performance of the brightness, appearance and longevity. Compared with conventional packaging material use in ordinary LED lamp, high-power LED packaging material required to meet more stringent requirements. Conventional epoxy and epoxy-modified type packaging material can’t meet the high power LED lamp in filling sealing material, in particular in the UV radiation, anti-yellowing, translucent and heat resistance in these areas.The silicone resin is a kind of special structure of the polymer, the main chain thereof can be viewed as a class of inorganic silicon dioxide, but there is even an organic group on the side chain. So its properties between inorganic and the organic material. Silicone has superior properties: good insulation, high light transmittance, excellent weather resistance and resistance to heat and UV aging ability, and less stress and no yellowing during curing. So this paper choose the silicone material as the LED packaging material.To preparing a high refractive index phenyl vinyl silicone resin, the thesis select a different difunctional and trifunctional organoalkoxysilane as a monomer, use solvent-free dehydration condensation copolymerization as polymerization method. By exploring different catalysts, the amount of added water, monomer ratio and synthesis processes, we prepared high refractive index phenyl vinyl silicone resin with suitable viscosity, molecular weight and molecular weight distribution were prepared. Then through a synthetic hydrogen silicone oil screened the most suitable for vinyl silicone resin crosslinking agent, discussed and analyzed optimal curing process for the preparation of packaging material. Determining the best monomer formulation ratio used in synthesis phenyl ethylene silicone resin by testing and characterization of the optical properties and mechanical properties. Eventually developed to high refractive index packaging material which meet the requirements of high power LED.