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Structured substrate for LEDs with high light extraction

  • US 9,412,904 B2
  • Filed: 01/04/2013
  • Issued: 08/09/2016
  • Est. Priority Date: 01/05/2012
  • Status: Active Grant
First Claim
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1. A device for back-scattering of an incident light ray, comprising:

  • a host substrate;

    a structured layer comprising;

    a first face which faces a front face of the host substrate,a second, flat, face provided on a light incident side of the device and which is parallel or substantially parallel to the first face, anda first material A and a second material B, which form, in a mixed plane, alternating surfaces which form random structured patterns with dimensions of these surfaces being between 350 nm and 600 nm, or of an order of the wavelength of the incident light along the mixed plane, wherein the mixed plane is between the first and second face of the structured layer, and the refractive index of the first and of the second material are different; and

    a specific layer covering the structured layer such that a boundary between the specific layer and the structured layer is flat, the specific layer being made of a material C which is different from material A of the structured layer and also different from material B of the structured layer, wherein the specific layer is crystalline and semi-conductive, with a thickness of less than one micrometer, or less than 500 nm.

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