Method of producing laminated type organic electroluminescent element and display apparatus

• US 20050196526A1
• Filed: 03/01/2005
• Published: 09/08/2005
• Est. Priority Date: 03/03/2004
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Ishida, Kohei
• Granted Patent: US 7,656,084 B2
• Time in Patent Office: Days
• US Class Current: 427/66
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths
• CPC Class Codes: H10K 85/631 Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine

Abstract

A method of manufacturing includes providing one of the anode and the cathode, providing a layer of bank portions on the cathode or the anode, the bank portions defining apertures, providing the light emitting units in the apertures, providing the charge-generating portions over the light emitting units, at least one of the charge-generating layers being formed using a depositing device, and providing the other of the anode and the cathode. A display apparatus has a laminated organic electroluminescent element obtained with the manufacturing method. The manufacturing method provides with a high production efficiency an organic EL element having between a cathode and an opposing transparent anode at least one layer of a plurality of light-emitting units partitioned by at least one layer of charge-generating layers.

Claims

1. A method of manufacturing a laminated type organic electroluminescent element that has between a cathode and an opposing transparent anode at least one layer of a plurality of light-emitting units, the light-emitting units being partitioned by at least one layer of charge-generating portions, the method comprising steps of:

providing one of the cathode and the anode;

providing a layer of bank portions on the one of the cathode and the anode, the bank portions defining apertures;

providing the light emitting units in the apertures;

providing the charge-generating portions over the light emitting units, at least one of the charge-generating portions being formed using a depositing device; and

providing the other of the anode and the cathode.

2. The method of manufacturing a laminated type organic electroluminescent element according to claim 1, wherein

the layer of the charge-generating portions has an electrical resistivity of 1.0×

10² Ω

·

cm or higher.

3. The method of manufacturing a laminated type organic electroluminescent element according to claim 1, wherein

the layer of the charge-generating portions has a transmittance rate of visible light that is 50% or higher.

4. The method of manufacturing a laminated type organic electroluminescent element according to claim 1, wherein

the layer of the charge-generating portions includes a laminated or mixed layer of two different types of substances with a charge-transfer complex composed of a radical cation and a radical anion being produced by an oxidation-reduction reaction between the two types of substances.

5. The method of manufacturing a laminated type organic electroluminescent element according to claim 1, wherein

the layer of the charge-generating portions includes a laminated or mixed layer of a component (a) an organic compound having an ionization potential that is smaller than 5.7 eV and electron-donating characteristics, and a component (b) at least one of an inorganic compound and an organic compound, the component (b) being capable of forming a change-transfer complex by an oxidation-reduction reaction with the organic compound (a), with a charge-transfer complex being formed by an oxidation-reduction reaction between the component (a) and the component (b).

6. The method of manufacturing a laminated type organic electroluminescent element according to claim 5, wherein

the component (a) is an arylamine compound shown in the following formula (I):

wherein Ar₁, Ar₂, and Ar₃ are aromatic hydrocarbons.

7. The method of manufacturing a laminated type organic electroluminescent element according to claim 5, wherein

the component (b) includes a metal oxide as an inorganic component.

8. The method of manufacturing a laminated type organic electroluminescent element according to claim 5, wherein

the component (b) includes a metal halide as an inorganic component.

9. The method of manufacturing a laminated type organic electroluminescent element according to claim 5, wherein

the component (b) has an organic compound that has at least one fluorine atom as a substituent and an electron-accepting characteristic.

10. The method of manufacturing a laminated type organic electroluminescent element according to claim 5, wherein

the component (b) has an organic compound that has at least one cyano group as a substituent and an electron-accepting characteristic.

11. The method of manufacturing a laminated type organic electroluminescent element according to claim 1, wherein

the light-emitting units are formed using a depositing device.

12. The method of manufacturing a laminated type organic electroluminescent element according to claim 1, wherein

each of the light-emitting units includes a hole injection/transport layer and a light-emitting layer, and

at least one of the hole injection/transport layers and the light-emitting layers are formed using a depositing device.

13. A display apparatus comprising the laminated type organic electroluminescent element obtained with the manufacturing method according to claim 1.