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Light extraction using feature size and shape control in LED surface roughening

  • US 10,121,937 B2
  • Filed: 07/21/2016
  • Issued: 11/06/2018
  • Est. Priority Date: 06/01/2012
  • Status: Active Grant
First Claim
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1. A light emitting device, comprising:

  • a light emitting structure, comprising;

    a light extraction surface, comprising;

    an undoped template layer devoid of islanding growth;

    a first conductive semiconductor layer on the undoped template layer, the first conductive semiconductor layer being devoid of islanding growth and less durable to etching than the undoped template layer; and

    etching features extending into the undoped template layer and the first conductive semiconductor layer, wherein a topology of the etching features at the undoped template layer is sharper than a topology of the etching features at the first conductive semiconductor layer;

    an active layer on the first conductive semiconductor layer;

    a second conductive semiconductor layer on the active layer, the second conductive semiconductor layer being an opposite polarity as the first conductive semiconductor layer; and

    N and P-type contacts on a same surface opposite the light extraction surface.

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