ORGANIC EL ELEMENT, METHOD OF MANUFACTURING ORGANIC EL ELEMENT, ORGANIC EL PANEL, ORGANIC EL DISPLAY DEVICE AND ELECTRONIC APPARATUS

• US 20200136078A1
• Filed: 10/24/2019
• Published: 04/30/2020
• Est. Priority Date: 10/26/2018
• Status: Abandoned Application

• Current Assignee: JOLED Inc.
• Original Assignee: JOLED Inc.
• Inventors: MISHIMA, Kosuke, SAKAMOTO, Koyo, SATO, Muneharu
• Application Number:
  US16/662,066
• Publication Number:
  US 20200136078A1
• Time in Patent Office: Days
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/165 comprising dopants
• CPC Class Codes: H10K 50/171 Electron injection layers
• CPC Class Codes: H10K 50/818 Reflective anodes, e.g. ITO combined with thick metallic layers
• CPC Class Codes: H10K 50/828 Transparent cathodes, e.g. comprising thin metal layers
• CPC Class Codes: H10K 50/846 comprising getter material or desiccants
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/135 using ink-jet printing

Abstract

An organic electroluminescence element includes an anode, an organic light emitting layer disposed on an upper side of the anode, a first functional layer disposed over the organic light emitting layer and including NaF, a second functional layer disposed over the first functional layer and including an organic material containing Yb, and a cathode disposed on an upper side of the second functional layer. A method of manufacturing an organic electroluminescence element, includes forming an anode, forming an organic light emitting layer on an upper side of the anode, forming a first functional layer including NaF over the organic light emitting layer, forming a second functional layer including an organic material containing Yb over the first functional layer, and forming a cathode on an upper side of the second functional layer.

Claims

1. An organic electroluminescence element comprising:

an anode;

an organic light emitting layer disposed on an upper side of the anode;

a first functional layer disposed over the organic light emitting layer and including NaF;

a second functional layer disposed over the first functional layer and including an organic material containing Yb; and

a cathode disposed on an upper side of the second functional layer.

2. The organic electroluminescence element according to claim 1,

wherein the first functional layer has a film thickness of 0.1 to 20 nm.

3. The organic electroluminescence element according to claim 1,

wherein the second functional layer has a film thickness of 5 to 150 nm.

4. The organic electroluminescence element according to claim 1,

wherein the second functional layer includes a first layer section disposed over the first functional layer, and a second layer section disposed over the first layer section, and

Yb content of the second layer section is greater than Yb content of the first layer section.

5. The organic electroluminescence element according to claim 1,

wherein the second functional layer includes a first layer section, a second layer section and a third layer section that are sequentially stacked in this order from the first functional layer side, and a relation of X2<

X1≤

X3 is satisfied, where X1, X2 and X3 are Yb contents of the first layer section, the second layer section and the third layer section, respectively.

6. The organic electroluminescence element according to claim 1,

wherein Yb content of the second functional layer increases continuously in going from the first functional layer toward the cathode.

7. The organic electroluminescence element according to claim 1,

wherein a transparent conductive film is formed as a third functional layer between the second functional layer and the cathode.

8. The organic electroluminescence element according to claim 7,

wherein the third functional layer has a film thickness of not less than 15 nm.

9. The organic electroluminescence element according to claim 7,

wherein a thin film including Yb and having a thickness of 0.1 to 3 nm is formed between the second functional layer and the third functional layer.

10. The organic electroluminescence element according to claim 7,

wherein a thin film including Yb and having a thickness of 0.1 to 3 nm is formed between the third functional layer and the cathode.

11. The organic electroluminescence element according to claim 1,

wherein a thin film including Yb and having a thickness of 0.1 to 5 nm is formed on an opposite side of the cathode from the organic light emitting layer.

12. The organic electroluminescence element according to claim 1,

wherein the anode has a light reflecting property, and the cathode has a semi-transparent property.

13. The organic electroluminescence element according to claim 12,

wherein light emitted from the organic light emitting layer includes a first light flux going out directly from the cathode and a second light flux going out from the cathode after being reflected by respective surfaces on the organic light emitting layer side of the anode and the cathode, and a film thickness of at least one functional layer interposed in a range from the organic light emitting layer to the cathode is set according to a wavelength of a color in which the light is emitted in such a manner that the first light flux and the second light flux resonate.

14. An organic electroluminescence panel

wherein a plurality of organic electroluminescence elements are arranged in a matrix pattern on an upper side of a substrate, the plurality of organic electroluminescence elements each including an anode, an organic light emitting layer disposed on an upper side of the anode, a first functional layer disposed over the organic light emitting layer and including NaF, a second functional layer disposed over the first functional layer and including an organic material containing Yb, and a cathode disposed on an upper side of the second functional layer, and the organic light emitting layers in at least the organic electroluminescence elements adjacent to each other in a row direction are partitioned from each other by a partition wall extending in a column direction.

15. The organic electroluminescence panel according to claim 14,

which is of a top emission type.

16. An organic electroluminescence display device comprising:

an organic electroluminescence panel in which a plurality of organic electroluminescence elements are arranged in a matrix pattern on an upper side of a substrate, the plurality of organic electroluminescence elements each including an anode, an organic light emitting layer disposed on an upper side of the anode, a first functional layer disposed over the organic light emitting layer and including NaF, a second functional layer disposed over the first functional layer and including an organic material containing Yb, and a cathode disposed on an upper side of the second functional layer, and the organic light emitting layers in at least the organic electroluminescence elements adjacent to each other in a row direction are partitioned from each other by a partition wall extending in a column direction; and

a driving section driving the organic electroluminescence panel to display an image.

17. An electronic apparatus comprising:

an organic electroluminescence display device as an image display section, the organic electroluminescence display device including

an organic electroluminescence panel in which a plurality of organic electroluminescence elements are arranged in a matrix pattern on an upper side of a substrate, the plurality of organic electroluminescence elements each including an anode, an organic light emitting layer disposed on an upper side of the anode, a first functional layer disposed over the organic light emitting layer and including NaF, a second functional layer disposed over the first functional layer and including an organic material containing Yb, and a cathode disposed on an upper side of the second functional layer, and the organic light emitting layers in at least the organic electroluminescence elements adjacent to each other in a row direction are partitioned from each other by a partition wall extending in a column direction, and

a driving section driving the organic electroluminescence panel to display an image.

18. A method of manufacturing an organic electroluminescence element, comprising:

forming an anode;

forming an organic light emitting layer on an upper side of the anode;

forming a first functional layer including NaF over the organic light emitting layer;

forming a second functional layer including an organic material containing Yb over the first functional layer; and

forming a cathode on an upper side of the second functional layer.

19. The method of manufacturing an organic electroluminescence element according to claim 18,

wherein the forming the second functional layer includes forming a layer of an organic material over the first functional layer, and thereafter doping the layer of the organic material with Yb to form the second functional layer.

20. The method of manufacturing an organic electroluminescence element according to claim 18, further comprising:

between the forming the anode and the forming the organic light emitting layer,

a hole movement facilitating layer forming step of forming a hole injection layer or a hole transport layer, and at least one of the hole movement facilitating layer forming step, the forming the organic light emitting layer, the forming the first functional layer, and the forming the second functional layer is carried out by a wet process.