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Phosphors and Silicone Dispersions

From the perspective of a silicone material chemist, this paper will address the benefits of using silicone in phosphor dispersions for High Brightness LED (HBLED) packages. This investigation first provides an overview of how versatile of a material silicone can be to the HB LED industry. An examination of the chemistry of silicone, the multiple material composition options and various cure chemistries demonstrates how silicone can be tailored to fit specific applications. A brief discussion of both physical and optical properties of two types of material compositions, Cured Gels and Thermosets, the most common types used in HB LED packaging. Then, a general investigation of the way a silicone interacts with a phosphor, in regards to compatibility, particle size and potential interactions. The paper will also review methods of dispersion, processing considerations and equipment.