Degradation of silicone in white LEDs during device operation: a finite element approach to product reliability prediction
Micro-cracks occur in LED converter silicone at high temperature operation. A thermo-optical model is developed for silicone temperature determination. Thermal aging of silicone comes along with volume shrinkage and hardening. A material degradation model is implemented in Ansys FE code. A reliability model is developed based on the simulated thermo-mechanical stress.
degradation silicone led reliability fem