Light-emitting device and its production

• US 20040046496A1
• Filed: 08/14/2003
• Published: 03/11/2004
• Est. Priority Date: 08/14/2002
• Status: Active Grant

• Current Assignee: UDC Ireland Limited
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: Mishima, Masayuki
• Granted Patent: US 7,622,862 B2
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: H10K 50/8445 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 71/50 Forming devices by joining two substrates together, e.g. lamination techniques
• CPC Class Codes: H10K 77/111 Flexible substrates
• CPC Class Codes: H10K 85/10 Organic polymers or oligomers
• CPC Class Codes: H10K 85/111 comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
• CPC Class Codes: H10K 85/631 Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
• CPC Class Codes: H10K 85/649 Aromatic compounds comprising a hetero atom
• CPC Class Codes: Y02E 10/549 Organic PV cells
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A light-emitting device comprises a laminate structure having an anode substrate, an anode, at least one organic layer comprising a light-emitting layer, a cathode and a cathode substrate in this order, wherein a water- and/or oxygen-absorbing layer is located between the cathode substrate and the cathode.

Claims

1. A light-emitting device comprising an anode substrate, an anode, at least one organic layer comprising a light-emitting layer, a cathode and a cathode substrate in this order, wherein at least one water- and oxygen-absorbing layer is located between the cathode substrate and the cathode.

2. The light-emitting device of claim 1, wherein the light-emitting device has a laminate structure, and wherein a laminate interface is located between the anode and the organic layer, the organic layer and the cathode, or the organic layers.

3. The light-emitting device of claim 1, wherein at least one water- and oxygen-absorbing layer comprises a reducing metal oxide or at least one metal and an alloy having a work function of 4.0 eV or less.

4. The light-emitting device of claim 3, wherein at least one water- and oxygen-absorbing layer comprises a reducing metal oxide.

5. The light-emitting device of claim 3, wherein the reducing metal oxide is an oxide in which an atom bonded to oxygen has a smaller oxidation number than its valency.

6. The light-emitting device of claim 3, wherein the reducing metal oxide is at least one selected from the group consisting of SiO, GeO, SnO, FeO, MnO and WO.

7. The light-emitting device of claim 6, wherein the reducing metal oxide is at least one selected from the group consisting of SiO, GeO, SnO and FeO.

8. The light-emitting device of claim 3, wherein the at least one water- and oxygen-absorbing layer comprises at least one metal and an alloy having a work function of 4.0 eV or less.

9. The light-emitting device of claim 8, wherein the at least one metal and an alloy is at least one selected from the group consisting of Ca, Ce, Cs, Er, Eu, Gd, Hf, K, La, Li, Mg, Nd, Rb, Sc, Sm, Y, Yb, Zn and combination thereof.

10. The light-emitting device of claim 9, wherein the metals is at least one selected from the group consisting of Ca, Li, Mg and combinations thereof

11. The light-emitting device of claim 1, wherein at least one water- and oxygen-absorbing layer has a thickness of 10 nm or more to 1 μ

m or less.

12. The light-emitting device of claim 1, wherein at least one water- and oxygen-absorbing layer is composed of a plurality of layers.

13. The light-emitting device of claim 1, wherein the organic layer further comprises at least one polymer.

20. The method of claim 10, wherein the temperature of the step of producing the laminate structure by bonding is from 40°

C. to 250°

C.

14. A method for producing a light-emitting device comprising an anode substrate, an anode, at least one organic layer comprising a light-emitting layer, a cathode, at least one water- and oxygen-absorbing layer and a cathode substrate in this order, the method comprising the step of producing the light-emitting device by laminating (a) a substructure containing the anode substrate and the anode to a substructure containing the cathode substrate, the at least one water- and oxygen-absorbing layer, the cathode and the organic layer, (b) a substructure containing the anode substrate, the anode and the organic layer to a substructure containing the cathode substrate, the at least one water- and oxygen-absorbing layer and the cathode, or (c) a substructure containing the anode substrate, the anode and part of the organic layer to a substructure containing the cathode substrate, the at least one water- and oxygen-absorbing layer, the cathode and the remaining organic layer.

15. The method of claim 14, wherein at least one water- and oxygen-absorbing layer is formed by a vapor deposition method or a sputtering method.

16. The method of claim 14, wherein the cathode is formed continuously after the formation of the at least one water- and oxygen-absorbing layer.

17. The method of claim 14, wherein the step of producing the laminate structure by bonding is selected from adhesion, pressure bonding or fusion.

18. The method of claim 17, wherein further comprising at least one heating and pressing.

19. The method of claim 18, wherein the heating is selected from a laminator, an infrared heater, a roller heater, a laser and a thermal head.