Patent ID: 7612381

Claim:
A semiconductor device, comprising: a translucent portion having a first semiconductor layer that has a first side and a second side; the first side of the first semiconductor layer is comprised of a first uniformly distributed periodic structure; a light emitting portion that contacts the first side and is comprised of: a thin coating of low temperature deposition buffer layer deposited onto the first side that mimics and parallels the first uniformly distributed periodic structure; the low temperature deposition buffer layer includes a second buffer side that contacts the first side of the first semiconductor layer, forming a second uniformly distributed periodic structure; the low temperature deposition buffer layer further includes a first buffer side forming a third uniformly distributed periodic structure, with the first buffer side contacting a second cladding side of a cladding layer, with the second cladding side forming a fourth uniformly distributed periodic structure as a result of contact with the first buffer side of the low temperature deposition buffer layer; a light emitting layer that contacts a first cladding side of the cladding layer; a barrier layer that contacts the light emitting layer; a contact layer that contacts the barrier layer; a p-electrode that contacts the contact layer; and a n-electrode that contacts the second side of the first semiconductor layer; with the first, the second, the third, and the fourth uniformly distributed periodic structure having an effective refractive index that converges gradually towards a second refractive index from a first refractive index as light emitted advances and penetrates more deeply in a height direction of one uniformly distributed periodic structure towards another uniformly distributed periodic structure, which improves transmittance of light by suppressing variations in first and second refractive indexes; with light ultimately extracted from the second side of the first semiconductor layer.