Method of producing laminated type organic electroluminescent element and display apparatus

• US 7,656,084 B2
• Filed: 03/01/2005
• Issued: 02/02/2010
• Est. Priority Date: 03/03/2004
• Status: Expired due to Fees

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Ishida, Kohei
• Primary Examiner(s): Williams; Joseph L
• Assistant Examiner(s): Breval; Elmito
• Application Number:
  US11/068,420
• Publication Number:
  US 20050196526A1
• Time in Patent Office: 1,799 Days
• Field of Search: 313504-512, 315/169.3, 315/169.4, 257/40, 257/79, 428/690, 345/30, 345/36, 345/44, 345/45, 445 22- 25
• US Class Current: 313/504
• 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 a plurality of light-emitting units between a cathode and an anode, the light-emitting units being partitioned by at least one charge-generating layer, the method comprising steps of:

providing one of the cathode and the anode;

providing a first layer of a bank portion so as to have an aperture corresponding to the one of the cathode and the anode;

providing a first layer of the light-emitting units in the aperture;

depositing a liquid material for forming the charge-generating layer onto a predetermined position above the first layer of the light-emitting units and the first layer of the bank portion, the charge-generating layer being formed using a depositing device;

providing a second layer of the bank portion onto a prescribed portion above the first layer of the bank portion and the charge-generating layer so that the charge-generating layer is at least partially interposed between the first and second layers of the bank portion; 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 charge-generating layer 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 charge-generating layer 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 charge-generating layer 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 charge-generating layer 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 charge-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 (b) includes a metal oxide as an inorganic component.

7. 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.

8. 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.

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

wherein Ar₁, Ar₂, and Ar₃ are aromatic hydrocarbons.

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.

14. The method of manufacturing a laminated type organic electroluminescent element according to claim 1, further comprising

providing a second layer of the light-emitting units on the charge-generating layer before the providing of the other of the anode and the cathode.