ORGANIC ELECTROLUMINESCENT DEVICE

• US 20080303424A1
• Filed: 04/18/2008
• Published: 12/11/2008
• Est. Priority Date: 04/25/2007
• Status: Active Grant

• Current Assignee: Element Capital Commercial Company Pte. Ltd.
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: YASUKAWA, Koji, MITSUYA, Masayuki
• Granted Patent: US 7,863,814 B2
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks

Abstract

An organic electroluminescent device includes a substrate on which a pixel region is disposed, and a partition structure including a stack of an inorganic partition made of an inorganic material and an organic partition made of an organic material, and an inorganic protective layer made of an inorganic material covering the surfaces of the organic partition. The partition structure surrounds the pixel region. A pixel electrode is in contact with the partition structure. An organic luminescent layer is disposed over the pixel electrode and covered with a cathode.

Claims

1. An organic electroluminescent device comprising:

a substrate on which a pixel region is disposed;

a partition structure including a stack of an inorganic partition made of an inorganic material and an organic partition made of an organic material, and an inorganic protective layer made of an inorganic material covering the surfaces of the organic partition, the partition structure surrounding the pixel region;

a pixel electrode in contact with the partition structure;

an organic luminescent layer disposed over the pixel electrode; and

a cathode covering the organic luminescent layer.

2. The organic electroluminescent device according to claim 1, wherein the inorganic protective layer mainly contains a compound selected from the group consisting of SiO, SiO₂, SiON, SiN, AlO, AlN, and Al₂O₃.

3. The organic electroluminescent device according to claim 1, wherein the inorganic protective layer has a thickness in the range of 50 to 200 nm.

4. The organic electroluminescent device according to claim 1, wherein the organic luminescent layer is formed by a gas phase process.

5. The organic electroluminescent device according to claim 1, wherein the organic partition has inclined surfaces forming a tapered shape in sectional view.

6. An organic electroluminescent device comprising:

a substrate;

a planarizing layer made of an organic material on the substrate;

a pixel electrode disposed on the planarizing layer;

an inorganic partition disposed on the planarizing layer so as to cover the upper edge of the pixel electrode and having a first aperture in which the planarizing layer is exposed;

an organic partition disposed on the inorganic partition, in contact with the planarizing layer through the first aperture;

an inorganic protective layer covering the organic partition and having a second aperture in which the organic partition is exposed;

an organic luminescent layer disposed on the pixel electrode; and

a cathode disposed on the organic luminescent layer.

7. The organic electroluminescent device according to claim 6, wherein the second aperture is formed in a region corresponding to the upper surface of the organic partition.

8. The organic electroluminescent device according to claim 6, wherein the second aperture covers at least part of the first aperture when viewing the substrate from above.

9. The organic electroluminescent device according to claim 6, wherein the inorganic protective layer mainly contains a compound selected from the group consisting of SiO, SiO₂, SiON, SiN, AlO, AlN, and Al₂O₃.

10. The organic electroluminescent device according to claim 6, wherein the inorganic protective layer has a thickness in the range of 50 to 200 nm.

11. The organic electroluminescent device according to claim 6, wherein the organic luminescent layer is formed by a gas phase process.