Light emitting device
AssigneePioneer Corporation
InventorJiro Fujimori
Life of this patent
Estimating the term…
Abstract
A covering layer (240) is formed by atomic layer deposition (ALD) and contains an insulating inorganic material. An intermediate layer (220) contains a material having a linear expansion coefficient different from that of a material of the covering layer (240). A buffer layer (230) has a surface in contact with the intermediate layer (220), that is, a first surface. The buffer layer (230) has a surface in contact with the covering layer (240), that is, a second surface. A linear expansion coefficient difference between a material of the buffer layer (230) and the inorganic material of the covering layer (240) is less than a linear expansion coefficient difference between the material of the intermediate layer (220) and the inorganic material of the covering layer (240).
Claims14
A light emitting device comprising:
- a light emitting portion positioned at a first surface side of a substrate and comprising a stacked structure of a first electrode, an organic layer comprising an emission layer, and a second electrode;
- and
- a sealing portion covering the light emitting portion,
- wherein the sealing portion comprises:
- a first covering layer comprising a first insulating inorganic material;
- a second covering layer comprising a second insulating inorganic material,
- an intermediate layer comprising a material having a linear expansion coefficient different from that of the first insulating inorganic material and that of the second insulating inorganic material;
- a first buffer layer;
- and
- a second buffer layer,
- wherein the second covering layer, the second layer, the intermediate layer, the first buffer layer, and the first covering layer are arranged in this order from the light emitting portion side,
- wherein an end portion of the intermediate layer is positioned closer to the light emitting portion than both of an end of the first buffer layer and an end of the second buffer layer,
- wherein a linear expansion coefficient difference between a material of the first buffer layer and the first insulating inorganic material is less than a linear expansion coefficient difference between the material of the intermediate layer and the first insulating inorganic material, and
- wherein a linear expansion coefficient difference between a material of the second buffer layer and the second insulating inorganic material is less than a linear expansion coefficient difference between the material of the intermediate layer and the second insulating inorganic material.
Dependencies are inferred from the claim text.