Sophia School Corporation

Seiko Epson Corporation

Sony Corporation

Hitachi, Ltd.

Katsumi Kishino

Shunsuke Ishizawa

Ichiro Nomura

Takafumi Noda

Hitoshi Nakamura

Tsunenori Asatsuma

Hiroki Nishioka

Akihiko Kikuchi

Koshi Tamamura

Sumiko Fujisaki

Takeshi Kikawa

Hiroyuki Shimada

Kunihiko Tasai

Yasuto Akatsuka

Hiroshi Nakajima

Tsukuru Ohtoshi

Shigehisa Tanaka

Hiroyasu Kaseya

Michifumi Nagawa

Hiroaki Jiroku

Koichiro Akasaka

Manabu Kudo

Yohei Nakagawa

Hiroto Sekiguchi

Hitoshi c/o Hitachi Ltd Nakamura

A light emitting apparatus includes a laminated structure provided at a substrate and including a plurality of columnar sections. The plurality of columnar sections each includes a light emitting layer including a plurality of first well layers, a first semiconductor layer provided between the substrate and the light emitting layer and containing Ga and N, an optical confining layer provided between the first semiconductor layer and the light emitting layer and confining light in the light emitting layer, and a second well layer provided between the first semiconductor layer and the optical confining layer. The first well layers and the second well layer are made of InGaN. The optical confining layer includes an InGaN layer. The composition formula of the first well layers is InGaN. The composition formula of the InGaN layer of the optical confining layer is InGaN. The composition formula of the second well layer is InGaN. The parameters x, y, and z satisfy 0<y<z<x<1.

Light emitting apparatus and projector

In a light emitting device, a first diametrical size that is the largest size of a columnar part between a substrate side of a light emitting layer and an opposite side of the substrate, the columnar part has a size no larger than the first diametrical size in an area between the substrate side of the light emitting layer and the substrate side of a first semiconductor layer, the columnar part has a size smaller than the first diametrical size in the area between the substrate side of the light emitting layer and the substrate side of the first semiconductor layer, the columnar part has a size no larger than the first diametrical size in an area between the opposite side to the substrate of the light emitting layer, and an opposite side to the substrate of a second semiconductor layer, and the columnar part has a size smaller than the first diametrical size in the area between the opposite side to the substrate of the light emitting layer in the laminating direction, and the opposite side to the substrate of the second semiconductor layer.

Light emitting device and projector

The light emitting device includes a substrate, and a laminated structure including columnar parts, wherein the columnar parts include a first semiconductor layer of a first conductivity type, a second semiconductor layer of a second conductivity type, and a light emitting layer disposed between the first semiconductor layer and the second semiconductor layer, the light emitting layer has a c-plane and a facet plane, the second semiconductor layer is disposed on the c-plane and the facet plane, the first semiconductor layer has a first portion and a second portion smaller in diametrical size than the first portion, the second portion is disposed between the substrate and the first portion, and the c-plane and the second portion overlap each other, and the c-plane is smaller in diametrical size than the second portion in a plan view from a stacking direction of the first semiconductor layer and the light emitting layer.

Light emitting device, projector, and display

A light emitting apparatus includes a laminate including a columnar section. The columnar section includes an n-type semiconductor layer, a first p-type semiconductor layer, a light emitting layer provided between the n-type semiconductor layer and the first p-type semiconductor layer, and a second p-type semiconductor layer in contact with the first p-type semiconductor layer. The first p-type semiconductor layer is provided between the light emitting layer and the second p-type semiconductor layer. The first p-type semiconductor layer has a c-plane and a facet surface. The second p-type semiconductor layer has a c-plane region provided at the c-plane and a facet-surface region provided at the facet surface. The c-plane region has negatively polarized charges at an interface with the first p-type semiconductor layer. The facet-surface region has positively polarized charges at the interface.

A light emitting apparatus includes a laminated structure including a plurality of columnar portions. The plurality of columnar portions each includes a first semiconductor layer, a second semiconductor layer different from the first semiconductor layer in terms of conductivity type, and a light emitting layer provided between the first semiconductor layer and the second semiconductor layer. The second semiconductor layer has a first section, and a second section that surrounds the first section in a plan view along a lamination direction in which the first semiconductor layer and the light emitting layer are laminated structured on each other and has a bandgap wider than a bandgap of the first section. The second section forms a side surface of each of the columnar portions.

A light emitting apparatus includes a laminated structure including a plurality of columnar section assemblies each formed of p columnar sections. The p columnar sections each include a light emitting layer. When viewed in the lamination direction of the laminated structure, the ratio of the maximum width to the minimum width of the light emitting layer in each of q first columnar sections out of the p columnar sections is greater than the ratio of the light emitting layer in each of r second columnar sections out of the p columnar sections. The light emitting layer in each of the p columnar sections does not have a rotationally symmetrical shape. The parameter p is an integer greater than or equal to 2. The parameter q is an integer greater than or equal to 1 but smaller than p. The parameter r is an integer that satisfies r=p−q.

A light emitting device includes a laminated structure having a plurality of columnar parts, wherein the columnar part includes a first semiconductor layer, a second semiconductor layer different in conductivity type from the first semiconductor layer, and a third semiconductor layer disposed between the first semiconductor layer and the second semiconductor layer, the third semiconductor layer includes a light emitting layer, and the second semiconductor layer includes a first portion, and a second portion which surrounds the first portion in a plan view from a laminating direction of the first semiconductor layer and the light emitting layer, and is lower in impurity concentration than the first portion.

A light emitting device includes a substrate, and a stacked body provided to the substrate, and including a plurality of first columnar parts, wherein the stacked body includes a first semiconductor layer, a second semiconductor layer different in conductivity type from the first semiconductor layer, and a light emitting layer disposed between the first semiconductor layer and the second semiconductor layer, the first semiconductor layer and the light emitting layer constitute the first columnar parts, the first semiconductor layer is disposed between the substrate and the light emitting layer, the second semiconductor layer is provided with a plurality of recessed parts, the recessed part is provided with a low refractive-index part lower in refractive index than the second semiconductor layer, a plurality of the first columnar parts constitutes a first photonic crystal, the second semiconductor layer and the low refractive-index parts constitute a second photonic crystal, and the first photonic crystal and the second photonic crystal are optically coupled to each other.

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.

A light emitting apparatus includes a substrate, a laminated structure provided at the substrate and including a plurality of columnar sections, and an electrode provided on the side opposite the substrate with respect to the laminated structure and injecting current into the laminated structure. The columnar sections each include an n-type first GaN layer, a p-type second GaN layer, and a light emitting layer provided between the first GaN layer and the second GaN layer. The first GaN layers are provided between the light emitting layers and the substrate. The laminated structure includes a p-type first AlGaN layer. The first AlGaN layer includes a first section provided between the second GaN layers of the columnar sections adjacent to each other and a second section provided between the first section and the electrode and between the columnar sections and the electrode.

A light-emitting device includes a substrate, a laminated structure having a plurality of column portions, and an electrode provided on a side of the laminated structure opposite from the substrate. Each of the plurality of column portions includes a light-emitting layer. The electrode is provided with a plurality of first holes. A diameter of each of the plurality of first holes is less than a wavelength of light generated by the light-emitting layer. A distance between adjacent first holes of the plurality of first holes is less than the wavelength of light generated by the light-emitting layer.

Light-emitting device and projector

There is provided a light emitting device including: a substrate; a laminated structure provided on the substrate and having a plurality of first columnar portions and a plurality of second columnar portions; and a first electrode and a second electrode, in which the first columnar portion includes a first semiconductor layer, a second semiconductor layer having a conductivity type different from the first semiconductor layer, and a light emitting layer provided between the first semiconductor layer and the second semiconductor layer, light generated in the light emitting layer propagates through the plurality of first columnar portions and the plurality of second columnar portions, a height of the second columnar portion is equal to or larger than a sum of a thickness of the first semiconductor layer and a thickness of the light emitting layer, and is lower than a height of the first columnar portion, the first semiconductor layer is provided between the substrate and the light emitting layer, the first electrode is electrically coupled to the first semiconductor layer, the second electrode is electrically coupled to the second semiconductor layer, and the second columnar portion is not electrically coupled to the second electrode.

The light emitting device includes a substrate, and a laminated structure provided to the substrate, and including a plurality of columnar parts, wherein the columnar part includes a first semiconductor layer, a second semiconductor layer different in conductivity type from the first semiconductor layer, and a light emitting layer disposed between the first semiconductor layer and the second semiconductor layer, the laminated structure includes a third semiconductor layer which is connected to an opposite side to the substrate of the second semiconductor layer, and is same in conductivity type as the second semiconductor layer, the second semiconductor layer is disposed between the light emitting layer and the third semiconductor layer, the third semiconductor layer is provided with a recessed part, an opening of the recessed part is provided to a surface at an opposite side to the substrate side of the third semiconductor layer, and a diametrical size in a bottom of the recessed part is smaller than a diametrical size in the opening of the recessed part.

A light emitting apparatus includes an electrode and a laminated structure. The laminated structure includes an n-type first semiconductor layer, a light emitting layer, a p-type second semiconductor layer, a tunnel junction layer, and an n-type third semiconductor layer. The electrode is electrically connected to the first semiconductor layer. The first semiconductor layer, the light emitting layer, the second semiconductor layer, the tunnel junction layer, and the third semiconductor layer are arranged in a presented order. The light emitting layer and the first semiconductor layer form a columnar section.

There is provided a light emitting device including: a substrate; a laminated structure provided on the substrate and having a plurality of columnar portions, in which the columnar portion includes an n-type first semiconductor layer, a p-type second semiconductor layer, a light emitting layer provided between the first semiconductor layer and the second semiconductor layer, and a third semiconductor layer having a band gap larger than that of the light emitting layer, and the third semiconductor layer includes a first part provided between the light emitting layer and the second semiconductor layer, and a second part that is in contact with a side surface of the light emitting layer.

Growing community of inventors

Akiruno, Japan

Katsumi Kishino