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News & Resources

Evaluation of Phosphor Settling Rate in Silicone Encapsulant

Working with LED manufacturers reveals a common problem: how to effectively add phosphor to the silicone encapsulant without having it settle or incur processing problems like curing too soon, deairing and bubbles. A study was done to evaluate two silicone encapsulation materials for their ability to maintain phosphor in solution for ease of manufacturing and production of white light emitting diodes. The phosphor dispersions were evaluated over a large temperature range, -40 to 150°C, to attempt to understand the material in the most broad and general way. This temperature range was subsequently divided into storage, -40°C to –20°C, dispensing, 15°C to 35°C, and curing, > 40°C, recognizing these portions of the range have unique requirements for production applications.