Light emitting device and projector
A light emitting device includes a substrate, and a laminated structure provided to the substrate, and including a columnar part, wherein the columnar part includes a first GaN layer having a first conductivity type, a second GaN layer having a second conductivity type different from the first conductivity type, and a light emitting layer disposed between the first GaN layer and the second GaN layer, the first GaN layer is disposed between the substrate and the light emitting layer, the light emitting layer has a first well layer as an InGaN layer, the first GaN layer has a c-face region, the first GaN layer has a crystal structure of a cubical crystal, and has a first layer constituting the c-face region, and a second layer as a GaN layer having a crystal structure of a hexagonal crystal is disposed between the first layer and the first well layer.
1. A light emitting device comprising:
a substrate; and
a laminated structure provided to the substrate, and including a columnar part, wherein
the columnar part includes
a first GaN layer having a first conductivity type,
a second GaN layer having a second conductivity type different from the first conductivity type, and
a light emitting layer disposed between the first GaN layer and the second GaN layer,
the first GaN layer is disposed between the substrate and the light emitting layer,
the light emitting layer has a first well layer as an InGaN layer,
the first GaN layer has a c-face region,
the first GaN layer has a crystal structure of a cubical crystal, and has a first layer constituting the c-face region, and
a second layer as a GaN layer having a crystal structure of a hexagonal crystal is disposed between the first layer and the first well layer.
2. The light emitting device according to claim 1 , wherein
the light emitting layer includes
a second well layer as an InGaN layer, and
a first barrier layer disposed between the first well layer and the second well layer,
first barrier layer is a GaN layer,
first well layer is disposed between the substrate and the second well layer,
first barrier layer includes
a third layer and a fourth layer each having a crystal structure of a hexagonal crystal, and
a fifth layer which is disposed between the third layer and the fourth layer, and has a crystal structure of a cubical crystal,
the third layer is disposed between the first well layer and the fifth layer, and
the fourth layer is disposed between the second well layer and the fifth layer.
3. The light emitting device according to claim 2 , wherein
the light emitting layer has a second barrier layer disposed between the second well layer and the second GaN layer,
the second barrier layer is a GaN layer,
the second barrier layer includes
a sixth layer and a seventh layer each having a crystal structure of a hexagonal crystal, and
an eighth layer which is disposed between the sixth layer and the seventh layer, and has a crystal structure of a cubical crystal,
the sixth layer is disposed between the second well layer and the eighth layer, and
the seventh layer is disposed between the second GaN layer and the eighth layer.
4. The light emitting device according to claim 1 , wherein
the second layer has a c-face region and a facet face region, and
an area of the light emitting layer disposed in the c-face region of the second layer is larger than an area of the light emitting layer disposed in the facet face region of the second layer.
5. The light emitting device according to claim 1 , wherein
the second layer has the first conductivity type.
6. The light emitting device according to claim 1 , wherein
the second layer is a barrier layer.
7. A projector comprising:
the light emitting device according to claim 1 .