Light-emitting diode (LED) is an electroluminescent solid-state device. With the continuous innovation of technology and the guidance of national policies, the entire LED product is developing rapidly, and the LED packaging industry is growing simultaneously. Among the packaging materials, organic silicon packaging materials have been recognized by the industry due to their excellent performance, and have become the fastest growing and most valuable packaging materials, and have shown huge market value.

LED silicone encapsulant is a new type of high-end liquid silicone, which is also called a kind of optical encapsulation. It can maintain high transparency in the visible light region, has a high absorption rate of ultraviolet rays, and can improve the light output rate and use of lighting devices. life.

In recent years, due to the rapid development of the LED industry, the demand for LED packaging materials has increased. Among them, LED silicone packaging materials have become the leader in LED packaging materials due to their excellent physical and chemical properties. With the aggravation of the energy crisis, the LED industry will maintain continuous growth. Therefore, the market potential of LED packaging materials is huge. High-power LED packaging materials require high light transmittance and refractive index of their raw materials, and phenyl silicone oil has become an important part of the raw materials of LED packaging glue. With the increase of phenyl mole fraction, the high temperature resistance, radiation resistance and refractive index of silicone materials have been improved, and the importance of phenyl silicone oil for LED packaging glue has increased.

Phenyl silicone oils for LED packaging mainly include vinyl-terminated methyl phenyl silicone oils and phenyl hydrogen-containing silicone oils. According to the phenyl content, phenyl silicone oil can be divided into: low phenyl silicone oil (phenyl mol fraction 5%-10%); medium phenyl silicone oil (phenyl mol fraction 25%); high phenyl silicone oil (phenyl mole fraction) 45%). Different uses of LED packaging glue have different requirements for phenyl content. High-power LED packaging glue generally requires a higher phenyl content in order to achieve a high refractive index, thereby reducing the energy loss of the light source.