Patent ID: 9142800
Filing Date: 2015-09-22
Classification: G02B,H01L,Y10T

Abstract:
1. A composite material for light emitting diodes, comprising: a transparent glass substrate with an index of refraction greater than 1.6; and a coating comprising scattering particles with an average diameter of 150 nm to 2 μm, the coating further comprising oxide nanoparticles with an average diameter of 4 nm to 20 nm embedded in a hybrid polymer matrix, the oxide nanoparticles increasing an index of refraction of the coating and having an index of refraction greater than or equal to 1.9 and between 0.5 and 2.0 higher than an index of refraction of the hybrid polymer matrix, and the index of refraction of the coating being greater than 1.6, the coating having a lower index of refraction than the transparent glass substrate and being a diffusely scattering coating, and wherein the oxide nanoparticles have hydroxyl groups that are chemically cross-linked with inorganic groups of the hybrid polymer matrix.