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Red light emitting diode and lighting device

  • US 10,177,274 B2
  • Filed: 11/19/2015
  • Issued: 01/08/2019
  • Est. Priority Date: 12/23/2014
  • Status: Active Grant
First Claim
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1. A red light emitting device comprising:

  • a first conductive type first semiconductor layer including AlInGaP;

    a first conductive type second semiconductor layer on the first conductive type first semiconductor layer and including a first superlattice structure, the first superlattice structure including a plurality of first series layers that includes AlInP and a plurality of second series layers alternately disposed between the plurality of first series layers and including AlInGaP, the plurality of second series layers having second bandgaps smaller than first band gas of the plurality of first series layers;

    an active layer on the first conductive type second semiconductor layer;

    a second conductive type third semiconductor layer on the active layer;

    a second conductive type fourth semiconductor layer on the second conductive type third semiconductor layer; and

    a second conductive type fifth semiconductor layer on the second conductive type fourth semiconductor layer, and including a second superlattice structure, the second superlattice structure including;

    a first series layer that includes GaP;

    a second series layer that includes GaP;

    a plurality of third series layers that are disposed between the first series layer and the second series layer and includes GaP; and

    a plurality of fourth series layers that are disposed between the plurality of third series layers and include InGaP, the first series layer and the second series layer including a second conductive type dopant that has a first concentration, the plurality of third series layers including the second conductive type dopant having a second concentration lower than the first concentration, and the plurality of fourth series layers not having the second conductive type dopant.

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