Gradient refractive index encapsulant layer for enhancing light extraction efficiency of multi-chip LED packaging

Abstract

Light extraction of high power LED has always been an issue for the big refractive index contrast between LED chips and encapsulant. In this work, a new structure of encapsulant with gradient refractive index is designed and tested and its mechanism is studied. High refractive index TiO2-epoxy composite is fabricated by dispersing TiO2 nanoparticles into… (More)

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