ORGANIC LIGHT EMITTING DEVICE AND METHOD OF MANUFACTURING THE SAME

• US 20160285041A1
• Filed: 04/21/2015
• Published: 09/29/2016
• Est. Priority Date: 03/25/2015
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Ye Xin Technology Consulting Co Ltd
• Inventors: KOBAYASHI, SETSUO
• Granted Patent: US 9,559,334 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H10K 2102/101 comprising transparent conductive oxides [TCO]
• CPC Class Codes: H10K 2102/103 comprising indium oxides, e.g. ITO
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/15 Hole transporting layers
• CPC Class Codes: H10K 50/813 characterised by their shape
• CPC Class Codes: H10K 50/818 Reflective anodes, e.g. ITO combined with thick metallic layers
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/12 using liquid deposition, e.g. spin coating
• CPC Class Codes: H10K 71/135 using ink-jet printing

Abstract

An organic light emitting device includes a substrate and an organic compound layer sandwiched between a pair of electrodes composed of an anode and a cathode. The organic compound layer includes at least two active layers. A melting point of each of the two active layers gradually decreases along a direction from the anode to the cathode.

Claims

1. An organic light emitting device comprising:

a substrate;

a pair of electrode composed of an anode and a cathode formed on the substrate; and

an organic compound layer sandwiched between the anode and the cathode, the organic compound layer comprising at least two active layers, wherein a melting point of each of the at least two active layers gradually decreases along a direction from the anode to the cathode.

2. The organic light emitting device according to claim 1, wherein the organic compound layer comprises a hole transporting layer and an organic luminescent layer, the hole transporting layer is formed on a surface of the anode, and the organic luminescent layer is formed on a surface of the hole transporting layer;

the hole transporting layer and the organic luminescent layer are respectively made of different organic materials having different melting points, a melting point of the hole transporting layer is greater than a melting point of the organic luminescent layer.

3. The organic light emitting device according to claim 1, wherein the organic compound layer comprises a hole injecting layer, a hole transporting layer, an organic luminescent layer, an electron injecting layer, and an electron transporting layer, which are respectively formed on a surface of the anode in sequence.

4. The organic light emitting device according to claim 1, wherein the at least two active layers of the organic compound layer are made of fatty acids compounds.

5. The organic light emitting device according to claim 4, wherein the fatty acids compounds are solid under a condition of room temperature.

6. The organic light emitting device according to claim 1, wherein the melting point of each of the at least two active layers is from 90 degrees to 130 degrees.

7. The organic light emitting device according to claim 1, further comprising a protection layer located on a surface of the cathode away from the anode, to protect or encapsulate the organic light emitting device.

8. The organic light emitting device according to claim 1, wherein the anode is a transparent electrode which is made of transparent conductive materials.

9. The organic light emitting device according to claim 8, wherein the anode is made of indium tin oxide (ITO), indium zinc oxide (IZO), aluminum zinc oxide (AZO), or transparent conductive film.

10. The organic light emitting device according to claim 1, wherein the anode comprises a plurality of electrode units and a plurality of insulators, each insulator is located between two adjacent electrode units to isolately separate the two adjacent electrode units.

11. The organic light emitting device according to claim 10, wherein the organic compound layer comprises a plurality of light emitting units 130, each light emitting unit is located on a surface of a corresponding electrode unit adjacent to the cathode;

the organic light emitting device further comprises a plurality of spacers 14 respectively located on surfaces of the insulators;

each spacer is located between two adjacent light emitting units to separate the two adjacent light emitting units.

12. A method of manufacturing an organic light emitting device comprising:

providing a substrate and forming an anode on the substrate; and

melting at least two organic materials having different melting points by a heating means;

coating and cooling each of the melted at least two organic materials on a surface of the anode respectively, in sequence, to form an organic compound layer having at least active layer;

wherein a melting point of one of the at least two active layers adjacent to the anode is greater than a melting point of another of the at least two active layers away from the anode.

13. The method according to claim 12, further comprising:

forming a cathode on a surface of the organic compound layer away from the anode; and

forming a protection layer on a surface of the cathode away from the anode.

14. The method according to claim 12, wherein the organic compound layer comprises a hole transporting layer, and the hole transporting layer is formed by:

heating a first material for forming the hole transporting layer to a first temperature using a heating device, to change the first material from a solid state to a liquid state; and

coating the first material on a surface of the anode and cooling the first material to make the state of the first material to return from the liquid state to the solid state, to form the hole transporting layer on the anode;

wherein the first temperature is greater than or equal to a melting point of the first material.

15. The method according to claim 14, wherein the organic compound layer further comprises an organic luminescent layer, and the organic luminescent layer is formed by:

heating a second material for forming the organic luminescent layer to a second temperature using the heating device, to change the second material from a solid state to a liquid state; and

coating the second material on a surface of the hole transporting layer and cooling the second material to make the state of the second material to return from the liquid state to the solid state, to form the organic luminescent layer;

wherein the second temperature is greater than or equal to a melting point of the second material but is less than the melting point of the first material.

16. The method according to claim 12, wherein the at least two active layers of the organic compound layer are made of fatty acids compounds.

17. The method according to claim 16, wherein the fatty acids compounds are solid under a condition of room temperature.

18. The method according to claim 12, wherein the melting point of each of the at least two active layers is from 90 degrees to 130 degrees.