Reliability Concerns Related With the Usage of Inorganic Particles in White Light-Emitting Diodes

Although adding nonemitting inorganic particles to the silicone encapsulant can be a strategy to improve reliabilities of white light-emitting diodes (wLEDs), its validity depends on the inorganic/organic interface compatibility. This work employs ZnO nanoparticles (NPs) with different surface conditions to study the physical relationships between degradation of wLEDs and inorganic/organic interfaces. Experimentally, it is found that 1 wt% of ZnO@SiO₂ NPs in lens can slow down the degradation rate of wLEDs under both UV exposure conditions and pressure cooking test conditions.