Organic light-emitting device and organic light-emitting display device using the same

Patent metadata

Field	Value
Publication number	US-2018122870-A1
Application number	US-201715794395-A
Country	US
Kind code	A1
Filing date	Oct 26, 2017
Priority date	Oct 31, 2016
Publication date	May 3, 2018
Grant date	—

Abstract

An organic light-emitting device, including: a substrate including a blue sub-pixel, a green sub-pixel, and a red sub-pixel, each blue sub-pixel, green sub-pixel, and red sub-pixel respectively including an anode, a first common layer, a second common layer, and a cathode, in the blue sub-pixel, a blue light-emitting layer between the first common layer and the second common layer, in the green sub-pixel, a green light-emitting layer between the first common layer and the second common layer, and in the red sub-pixel, a red light-emitting layer between the first common layer and the second common layer, wherein HOMO energy levels of the blue, green, and red light-emitting layers are each lower than a HOMO energy level of the first common layer, and wherein the HOMO energy level of the green light-emitting layer is 0.2 eV or more higher than the HOMO energy level of the blue light-emitting layer.

First claim

What is claimed is:

1 . An organic light-emitting device, comprising:
a substrate comprising a blue sub-pixel, a green sub-pixel, and a red sub-pixel, each blue sub-pixel, green sub-pixel, and red sub-pixel respectively comprising an anode, a first common layer, a second common layer, and a cathode; in the blue sub-pixel, a blue light-emitting layer between the first common layer and the second common layer; in the green sub-pixel, a green light-emitting layer between the first common layer and the second common layer; and in the red sub-pixel, a red light-emitting layer between the first common layer and the second common layer, wherein HOMO energy levels of the blue, green, and red light-emitting layers are each lower than a HOMO energy level of the first common layer, and wherein the HOMO energy level of the green light-emitting layer is 0.2 eV or more higher than the HOMO energy level of the blue light-emitting layer.

2 . The organic light-emitting device according to claim 1 , wherein the HOMO energy level of the red light-emitting layer is 0.2 eV or more higher than the HOMO energy level of the green light-emitting layer.

3 . The organic light-emitting device according to claim 2 , wherein:
the red light-emitting layer is thicker than the green light-emitting layer; and the green light-emitting layer is thicker than the blue light-emitting layer.

4 . The organic light-emitting device according to claim 1 , wherein the first common layer contacts each of the blue light-emitting layer, the green light-emitting layer, and the red light-emitting layer.

5 . The organic light-emitting device according to claim 1 , further comprising a third common layer between the first common layer and a color-emitting layer that comprises the blue light-emitting layer, the green light-emitting layer, and the red light-emitting layer.

6 . The organic light-emitting device according to claim 5 , wherein each of the blue light-emitting layer, the green light-emitting layer, and the red light-emitting layer contacts the third common layer.

7 . The organic light-emitting device according to claim 6 , wherein a HOMO energy level of the third common layer is lower than the HOMO energy level of the first common layer.

8 . The organic light-emitting device according to claim 7 , wherein the HOMO energy levels of the blue, green, and red light-emitting layers are each lower than the HOMO energy level of the third common layer.

9 . The organic light-emitting device according to claim 8 , wherein the HOMO energy level of the red light-emitting layer is 0.2 eV or more higher than the HOMO energy level of the green light-emitting layer.

10 . The organic light-emitting device according to claim 1 , wherein:
a plurality of units are stacked in each sub-pixel; and each of the plurality of units comprises:
the first common layer;
a color-emitting layer comprising at least one of: the blue light-emitting layer, the green light-emitting layer, and the red light-emitting layer; and
the second common layer between the anode and the cathode.

11 . The organic light-emitting device according to claim 10 , further comprising a charge generation layer among the plurality of units.

12 . The organic light-emitting device according to claim 11 , further comprising, in at least one of the plurality of units, a third common layer between first common layer and the color-emitting layer including the blue light-emitting layer, the green light-emitting layer, and the red light-emitting layer.

13 . An organic light-emitting display device, comprising:
a substrate comprising a blue sub-pixel, a green sub-pixel, and a red sub-pixel, each sub-pixel comprising:
a transistor;
a stack in an order of: an anode connected to the transistor, a first common layer, a second common layer, and a cathode;
in the blue sub-pixel, a blue light-emitting layer between the first common layer and the second common layer; in the green sub-pixel, a green light-emitting layer between the first common layer and the second common layer; and in the red sub-pixel, a red light-emitting layer between the first common layer and the second common layer, wherein HOMO energy levels of the blue, green, and red light-emitting layers are each lower than a HOMO energy level of the first common layer, and wherein the HOMO energy level of the green light-emitting layer is 0.2 eV or more higher than the HOMO energy level of the blue light-emitting layer.

14 . The organic light-emitting display device according to claim 13 , wherein the HOMO energy level of the red light-emitting layer is 0.2 eV or more higher than the HOMO energy level of the green light-emitting layer.

Assignees

• Lg Display Co Ltd

Inventors

• Park Eun-Jung
• Kim Kwan-Soo
• Seok Han-Byeol
• Kim Seok-Hyun

Classifications

• H10K59/122

  Pixel-defining structures or layers, e.g. banks · CPC title

• H10K59/874

  including getter material or desiccant · CPC title

• H10K59/38

  comprising colour filters or colour changing media [CCM] · CPC title

• H10K59/124

  Insulating layers formed between TFT elements and OLED elements · CPC title

• H10K59/876

  comprising a resonant cavity structure, e.g. Bragg reflector pair · CPC title