GE Toshiba Wacker Silicones Corp launched a white LED package with silica gel

GE Toshiba Wacker Silicones Corp before the expansion of light emitting diode for high output power lighting equipment and car headlights etc. (LED) silicone products, and began to accept the order. The product's name is "InvisiSi1". The launch of the silica gel will be used to fill in the LED chip package and the formation of the lens on the LED and other uses. In order to be able to adapt to the needs of more users, the company added a number of 11 different varieties of hardness and hardness before hardening. In terms of lens use, the launch of the industry's first to support injection molding products. In high power white LED blue LED chip and LED chip in the near ultraviolet, must take measures to deal with the adverse effects caused by chip fever and short waves, so in the packaging material and chip for forming a lens material, basically use ratio of epoxy resin is more heat and UV effect of silica gel. Expected to lighting equipment and headlights and other high output power white LED market will be further expanded, the company plans to launch the new products to adapt to the trend of expansion of the LED market.

The silica gel used for filling the LED chip includes 6 varieties for packaging the LED chip in the individual packaging and the use of the plurality of LED chips on the printed circuit board to encapsulate the 3 varieties. The former can be divided into 4 varieties with a refractive index of 1.41 and a refractive index of up to 1.5 to 1.53 of the varieties. Light transmittance, the above varieties in the wavelength range of 350nm to 800nm over 95%. However, the high refractive index of the product in the wavelength of less than 350nm, the transmittance will decline, the wavelength of 300nm transmittance of 75% ~ ~ 80%. The refractive index of 1.41 products at the wavelength of 300nm still maintain more than 95% of the high transmittance. The launch of the silica gel even at 180 degrees Celsius exposure for 14 days, the light transmittance is almost no change. Under the same conditions, the transmittance of 350nm light will decrease from 90% to almost zero. And the introduction of silica gel short wave resistance performance is also good, even if the wavelength of 365nm UV light intensity of 100mJ/cm2 irradiation for 208 hours, the light transmittance also did not change.

For printed circuit board LED chip used in the encapsulation of the silica gel can be formed in the lens package at the same time, the company has adjusted its liquidity and adhesion. The shape of the lens can be formed at the same time when the resin is dripped onto the chip. The launch of the company's 3 varieties formed by different lens shapes. Light transmittance, the wavelength of 400nm is about 70%, and with the increase of wavelength, the wavelength is 800nm, the transmittance is also increased to 90% ~ 95%.

For the formation of the lens of the silica gel before hardening and hardening of the hardness of the different types are divided into 2 categories, the refractive index are all 1.41. In terms of light transmittance, the varieties with higher viscosity and hardness were 93% and 99% at the wavelength of 400nm and 800nm, respectively. The varieties with low viscosity and hardness were divided into several species of more than 99% and above.