Japan's Shin-Etsu Chemical Co., Ltd. has developed a new low-refractive-index "KER-7000 Series" that reduces gas permeability. The new product is available in "KER-7080 A/B" with a Shore A hardness of 80 and "KER-7030 A/B" with a Shore A hardness of 30. Samples will be supplied for lighting LEDs.
In a gas-permeable packaging material, gas such as oxygen is easily invaded, so that oxidation and vulcanization reactions occur in the peripheral parts of the LED, which may cause a decrease in brightness.
The new products developed by Shin-Etsu Chemical Industry have maintained the same level of heat resistance as methyl silicon, and reduced the gas permeability to about 1/10 of that of methyl silicon. In addition, the new product has the same gas permeability as phenyl silicon, but greatly improves heat resistance. The KER-7000 series is used as a packaging material to prevent the brightness from being lowered due to corrosion of the peripheral parts, which helps to improve the reliability of high-brightness LEDs. In addition, the product's refractive index is 1.38, lower than methyl silicon, such excellent light transmission is particularly suitable for high-brightness LED flat package.
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