As a core optical material in the LED industry chain, the performance optimization of high refractive index phenyl type LED packaging adhesive directly promotes the innovation of lighting and display technology. This type of material is based on phenyl silicone oil and achieves refractive index improvement through precise control of the phenyl content in the molecular chain.

Typically, when the phenyl mole fraction is in the range of 25% to 45%, the refractive index can reach 1.52 or above, and some optimized formulations even exceed 1.599, which is significantly higher than the refractive index improvement of 1.41 for ordinary methyl silicone oil. It effectively reduces the total reflection loss of light at the interface between the chip and packaging material, improves LED light efficiency by 3% to 27%, and reduces energy consumption by one-third at the same brightness.

Its optical characteristics are also reflected in a high transmittance of over 98%, combined with a 5-fold improvement in anti UV aging performance, ensuring that the light attenuation is controlled within 5% after 50000 hours of use, greatly extending the lifespan of the equipment.

At the material composition level, this type of encapsulation adhesive often uses a two-component addition molding silicone system, which is composed of ethylene containing polysiloxane and hydrogen containing polysiloxane mixed in a specific ratio, supplemented by platinum catalyst to achieve step heating curing. For example, after pre curing at 100 ℃ for 1 hour, a process that lasts for 3.5 to 4 hours at 150 ℃ can form a dense structure with Shore D65 hardness, while maintaining low curing shrinkage and excellent adhesive strength.

Phenyl silicone oil can be divided into methyl phenyl chain type, diphenyl chain type, and mixed type according to its structure. Among them, silicone oil with high phenyl content (45%) exhibits a luminous efficiency of 180lm/W in COB packaging modules, which is 27% higher than traditional materials. Its temperature resistance exceeds 300 ℃, reducing the junction temperature of high-power LEDs by 18 ℃ and significantly improving heat dissipation performance.

Regarding liquid silicone rubber, please refer to our website for details: IOTA Liquid Silicone Rubber