US 9,000,469 B2 · Nitride group semiconductor light emitting device

Abstract

A nitride group semiconductor light emitting device includes a nitride group semiconductor layer, and an electrode structure. The electrode structure is arranged on or above the semiconductor layer, and includes a plurality of deposited metal layers. The plurality of deposited metal layers of the electrode structure includes first and second metal layers. The first metal layer is arranged on the semiconductor layer side. The second metal layer is arranged on or above the first metal layer. The first metal layer contains Cr, and a first metal material. The first metal material has a reflectivity higher than Cr at the light emission peak wavelength of the light emitting device. According to this construction, the first metal layer can have a higher reflectivity as compared with the case where the first metal layer is only formed of Cr, but can keep tight contact with the semiconductor layer.

Claims19

Dependent claims

A nitride group semiconductor light emitting device comprising:

a nitride group semiconductor layer, and
an electrode structure that is arranged on or above said semiconductor layer, and includes a plurality of deposited metal layers,
wherein said plurality of deposited metal layers of the electrode structure include
a first metal layer that is arranged on said semiconductor layer side, and
a second metal layer that is arranged on or above said first metal layer,
wherein said first metal layer contains Cr, and a first metal material that has a reflectivity higher than Cr at the light emission peak wavelength of said light emitting device,
wherein said second metal layer contains at least Pt or Rh, and
wherein the content of Cr in said first metal layer falls within 2.5 wt % to 50 wt %.

5 more elements

Dependencies are inferred from the claim text.

Nitride group semiconductor light emitting device

Life of this patent

Nitride group semiconductor light emitting device

Life of this patent

Abstract

Claims19