Organic electroluminescent device and manufacturing method thereof

• US 9,246,119 B2
• Filed: 06/20/2013
• Issued: 01/26/2016
• Est. Priority Date: 01/25/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Lee, Chang-ho, Shim, Jihye, Yoon, Jihwan, Yun, Jinyoung
• Primary Examiner(s): Green, Tracie Y
• Application Number:
  US13/923,265
• Publication Number:
  US 20140209870A1
• Time in Patent Office: 950 Days
• Field of Search: 313/511, 313503-504
• US Class Current: 1/1
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/876 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

An organic electroluminescent device includes a plurality of main pixels. Each of the main pixels includes red, green, and blue sub-pixels. Each of the sub-pixels includes a first electrode, a second electrode opposite to the first electrode, and an organic light emitting layer between the first and second electrode. The organic light emitting layer of each of the sub-pixels includes a blue light emitting layer and a green light emitting layer. Optical microresonator distances of the red, green, and blue sub-pixels are different from each other.

Claims

1. An organic electroluminescent device comprising:

a plurality of main pixels, each of the main pixels comprising a red sub-pixel, a green sub-pixel, and a blue sub-pixel,

wherein each of the red sub-pixel, the green sub-pixel, and the blue sub-pixel comprises;

a first electrode;

a second electrode opposite to the first electrode; and

an organic light emitting layer between the first electrode and the second electrode, the organic light emitting layer comprising a blue light emitting layer and a green light emitting layer,

wherein one of the first electrode or the second electrode comprises a semitransparent material and an other one of the first electrode or the second electrode comprises a light reflection material, and

wherein an optical microresonator distance is defined between the first electrode and the second electrode, the optical microresonator distance of one of the red sub-pixel, the green sub-pixel, or the blue sub-pixel is different from the optical microresonator distance of other ones of the red sub-pixel, the green sub-pixel, or the blue sub-pixel.

2. The organic electroluminescent device of claim 1, wherein the organic light emitting layer of the red sub-pixel further comprises a red light emitting layer.

3. The organic electroluminescent device of claim 2, wherein the optical microresonator distance between the first electrode and the second electrode of the red sub-pixel satisfies equations 1, 2, and 3:

4. The organic electroluminescent device of claim 2, wherein the optical microresonator distance between the first electrode and the second electrode of the green sub-pixel satisfies equations 1 and 2:

5. The organic electroluminescent device of claim 2, wherein the optical microresonator distance between the first electrode and the second electrode of the blue sub-pixel satisfies equations 1 and 2:

6. The organic electroluminescent device of claim 2, wherein the optical microresonator distance of the green sub-pixel is greater than the optical microresonator distance of the blue sub-pixel and is smaller than the optical microresonator distance of the red sub-pixel.

7. The organic electroluminescent device of claim 1,

wherein the red sub-pixel further comprises:

a first assistant layer between the organic light emitting layer and the first electrode of the red sub-pixel or between the organic light emitting layer and the second electrode of the red sub-pixel; and

wherein the green sub-pixel further comprises;

a second assistant layer between the organic light emitting layer and the first electrode of the green sub-pixel or between the organic light emitting layer and the second electrode of the green sub-pixel.

8. The organic electroluminescent device of claim 7, wherein the first assistant layer directly contacts the second assistant layer so that the first assistant layer and the second assistant layer comprises one body.

9. The organic electroluminescent device of claim 7, wherein a thickness of the first assistant layer is different from a thickness of the second assistant layer.

10. The organic electroluminescent device of claim 1, wherein each of the red sub-pixel, the green sub-pixel, and the blue sub-pixel further comprises:

a hole injecting layer and a hole transfer layer between the organic light emitting layer and the first electrode; and

an electron injecting layer and an electron transfer layer between the organic light emitting layer and the second electrode.