Patent ID: 7307286
Filing Date: 2007-12-11
Classification: C08K,C09D,H01L

Abstract:
1. An epoxy resin composition for encapsulating an optical semiconductor element, comprising: (A) an epoxy resin complex which comprises an epoxy resin as the matrix component and silicon dioxide particles (a) dispersed therein: said silicon dioxide particles (a) having an average particle size of from 5 to 40 nm measured by the small angle neutron scattering (SANS) (B) a curing agent, and (C) glass powder, wherein the relationship between an index of refraction (n1) of a cured product prepared by curing components other than a glass powder of component (C) in the epoxy resin composition for encapsulating an optical semiconductor element and an index of refraction (n2) of the component (C) satisfies the following formula (1): wherein n1: index of refraction of a cured product prepared by curing components other than the component (C) at a wavelength of 589.3 nm n2: index of refraction of the component (C) at a wavelength of 589.3 nm.