Light emitting device

• US 8,890,204 B2
• Filed: 01/30/2014
• Issued: 11/18/2014
• Est. Priority Date: 03/22/2005
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Seo, Satoshi, Yamazaki, Shunpei
• Primary Examiner(s): CHU, CHRIS C
• Application Number:
  US14/168,439
• Publication Number:
  US 20140145220A1
• Time in Patent Office: 292 Days
• Field of Search: 257/E25.008, 257/E33.056, 257/40, 257/90, 257/91, 257/99, 257/81, 257/89, 257/103, 313/500, 313/502, 313/503, 313/512, 427/69, 345/76, 315/169.3, 428/917, 445/25, 438/22
• US Class Current: 257/99
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
• CPC Class Codes: H10K 2102/3031 Two-side emission, e.g. transparent OLEDs [TOLED]
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/17 Passive-matrix OLED displays
• CPC Class Codes: H10K 59/173 comprising banks or shadow masks
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths
• CPC Class Codes: H10K 59/805 Electrodes

Abstract

To provide a light emitting device in which generation of cross talk between adjacent light emitting elements is suppressed, even when the light emitting device uses a light emitting element having high current efficiency. Also, to provide a light emitting device having high display quality even when the light emitting device uses a light emitting element having high current efficiency. The light emitting device has a pixel portion including a plurality of light emitting elements, wherein each of the plurality of light emitting elements includes a plurality of light emitting bodies provided between a first electrode and a second electrode and a conductive layer formed between the plurality of light emitting bodies, wherein the conductive layer is provided for each light emitting element, and wherein an edge portion of the conductive layer is covered with the plurality of light emitting bodies.

Claims

1. A light emitting device comprising:

a first light emitting element and a second light emitting element each comprising;

a first electrode;

a second electrode;

a first light emitting body;

a second light emitting body over the first light emitting body; and

a conductive layer between the first light emitting body and the second light emitting body, and

a partition wall between the first electrode of the first light emitting element and the first electrode of the second light emitting element, wherein the partition wall is formed over an edge portion of the first electrode of the first light emitting element and an edge portion of the first electrode of the second light emitting element,

wherein the first light emitting body is formed over the first electrode of the first light emitting element, the first electrode of the second light emitting element, and the partition wall,

wherein the first light emitting body and the second light emitting body are formed between the first electrode and the second electrode, and

wherein the conductive layer of the first light emitting element and the conductive layer of the second light emitting element are electrically isolated from each other at a portion over the partition wall.

2. The light emitting device according to claim 1,

wherein an edge portion of the conductive layer is covered with the first light emitting body and the second light emitting body.

3. The light emitting device according to claim 1,

wherein the conductive layer is capable to generate an electron and a hole.

4. The light emitting device according to claim 1,

wherein a layer formed using at least a part of compounds included in the first light emitting body and the second light emitting body is provided between adjacent conductive layers which are independent from one another.

5. The light emitting device according to claim 1,

wherein an edge portion of the conductive layer is provided outside of an edge portion of a light emitting region in each of the first light emitting element and the second light emitting element.

6. The light emitting device according to claim 1,

wherein a second conductive layer is formed in contact with the first electrode.

7. The light emitting device according to claim 1,

wherein a second conductive layer is formed in contact with the first electrode and a third conductive layer is formed in contact with the second electrode.

8. The light emitting device according to claim 1, further comprising:

a transistor electrically connected to the first electrode.

9. A light emitting device comprising:

a first electrode;

a second electrode;

a partition wall between the first electrode and the second electrode, wherein the partition wall is formed over an edge portion of the first electrode and an edge portion of the second electrode;

a first light emitting layer over the first electrode, the second electrode and the partition wall;

a first conductive layer over the first electrode with the first light emitting layer interposed therebetween;

a second conductive layer over the second electrode with the first light emitting layer interposed therebetween;

a second light emitting layer over the first conductive layer and the second conductive layer; and

a third electrode over the second light emitting layer,

wherein the first conductive layer and the second conductive layer are electrically isolated from each other at a portion over the partition wall.

10. The light emitting device according to claim 9,

wherein edge portions of the first conductive layer and the second conductive layer are covered with the first light emitting layer and the second light emitting layer.

11. The light emitting device according to claim 9,

wherein each of the first conductive layer and the second conductive layer is capable to generate an electron and a hole.

12. The light emitting device according to claim 9,

wherein a layer formed using at least a part of compounds included in the first light emitting layer and the second light emitting layer is provided between adjacent conductive layers which are independent from one another.

13. The light emitting device according to claim 9,

wherein an edge portion of the first conductive layer is provided outside of an edge portion of a light emitting region.

14. The light emitting device according to claim 9,

wherein a third conductive layer is formed in contact with the first electrode.

15. The light emitting device according to claim 9,

wherein a third conductive layer is formed in contact with the first electrode and a fourth conductive layer is formed in contact with the third electrode.

16. The light emitting device according to claim 9, further comprising:

a first transistor electrically connected to the first electrode; and

a second transistor electrically connected to the second electrode.