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Light emitting device with trench beneath a top contact

  • US 10,224,457 B2
  • Filed: 11/05/2015
  • Issued: 03/05/2019
  • Est. Priority Date: 11/06/2014
  • Status: Active Grant
First Claim
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1. A device comprising:

  • a semiconductor structure comprising a light emitting layer disposed between an upper region having a first conductivity and a lower region having a second conductivity opposite the first conductivity;

    a top contact disposed on a top surface of the semiconductor structure, the top contact being electrically connected to the upper region;

    a mount;

    a trench formed in a bottom surface of the semiconductor structure beneath the top contact, the trench extending from the bottom surface without penetrating the light emitting layer, the trench creating a thermal conduction path from an n-contact arm to the mount, and comprising a first sidewall extending from a top of the trench to a bottom of the trench such that the entire first sidewall is angled less than 90°

    relative to a normal to the top surface of the semiconductor structure;

    a reflective layer disposed over the bottom surface and in the trench, the reflective layer in the trench forming at least part of a mirror that reflects light away from the top contact; and

    a filler material disposed in a void where the reflective layer does not completely fill the trench.

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