Synthesis of High-Refractive-Index Epoxy-Modified Vinyl Methyl Phenyl Silicone Resins for Encapsulation of LEDs

Effects of Ultraviolet Wavelength and Ambient Temperature on Reliability of Silicones in InAlGaN-Based Light-Emitting-Diode Package

“…For example, epoxy-modified silicone materials were found to have good thermal stability, high transmittance (>90%), and better resistance to high-temperature and UV radiation than conventional epoxy resins. 18 Furthermore, the incorporation of a silicone resin (about 10%) in the epoxy encapsulant was shown to increase the thermal decomposition temperature and UV resistance as well as lower the equilibrium water sorption. 19 It was also found that thermal aging at 200 °C for 72 h caused a 55% degradation of the transmittance at 365 nm, which further decreased by 2.5% after UV exposure for 72 h. 20 Notwithstanding the importance of UV exposure on the performance of silicones, reports on UV exposure effects have not been extensively investigated thus far.…”