Light emitting device, light emitting device package, and lighting system

  • US 8,969,893 B2
  • Filed: 02/24/2011
  • Issued: 03/03/2015
  • Est. Priority Date: 04/28/2010
  • Status: Active Grant
First Claim
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1. A light emitting device comprising:

  • a light emitting structure including a first conductive type semiconductor layer, a second conductive type semiconductor layer over the first conductive type semiconductor layer, and an active layer between the first conductive type semiconductor layer and the second conductive type semiconductor layer;

    a light extraction pattern comprising a non-periodic pattern in the light emitting structure; and

    a phosphor layer over the light extraction pattern,wherein the phosphor layer comprises a first surface near the light emitting structure and a second surface facing an opposite side from the first surface, and the first surface includes a plurality of protrusion patterns corresponding to the light extraction pattern disposed in the light emitting structure,wherein at least two protrusion patterns of the plurality of protrusion patterns have substantially different widths from each other, andwherein the second surface is substantially flat and is farther from the light emitting structure than the first surface,wherein the light extraction pattern is disposed in the first conductive type semiconductor layer,wherein the light extraction pattern comprises a side surface substantially perpendicular to the second surface of the phosphor layer,wherein the light extraction pattern comprises a bottom surface and a first and a second side surfaces substantially perpendicular,wherein the bottom surface is parallel with an upper surface of the first conductive type semiconductor layer,wherein the first side surface is parallel to the second side surface.

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