LIGHT-EMITTING ELEMENT

• US 20150349209A1
• Filed: 05/27/2015
• Published: 12/03/2015
• Est. Priority Date: 05/27/2014
• Status: Active Grant

• Current Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Original Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Inventors: SHINOHARA, Hironao, NAGAMATSU, Yuichi
• Granted Patent: US 9,887,323 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01L 33/405 Reflective materials
• CPC Class Codes: H01L 33/42 Transparent materials
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• CPC Class Codes: H01L 33/486 adapted for surface mounting

Abstract

A light-emitting element includes a semiconductor laminate including a light-emitting layer, a transparent electrode layer formed on the semiconductor laminate, the transparent electrode layer including an oxide including indium, a pad electrode formed on the transparent electrode layer so as to connect to the transparent electrode layer, and a reflective layer including aluminum. The reflective layer is formed under the pad electrode so as not to contact the transparent electrode layer.

Claims

1. A light-emitting element, comprising:

a semiconductor laminate comprising a light-emitting layer;

a transparent electrode layer formed on the semiconductor laminate, the transparent electrode layer comprising an oxide including indium;

a pad electrode formed on the transparent electrode layer so as to connect to the transparent electrode layer; and

a reflective layer including aluminum,

wherein the reflective layer is formed under the pad electrode so as not to contact the transparent electrode layer.

2. The light-emitting element according to claim 1, further comprising an insulating current blocking layer formed between the reflective layer and the semiconductor laminate so as to block a current to the semiconductor laminate in a region directly below the pad electrode.

3. The light-emitting element according to claim 1, wherein the reflective layer is formed inside a hole formed on the transparent electrode layer.

4. The light-emitting element according to claim 1, wherein the reflective layer comprises an Al film.

5. The light-emitting element according to claim 1, wherein the transparent electrode layer comprises one of IZO, In₂O₃, ITO and IFO.