Organic EL element

• US 20030170496A1
• Filed: 03/07/2003
• Published: 09/11/2003
• Est. Priority Date: 03/07/2002
• Status: Active Grant

• Current Assignee: Futaba Corporation
• Original Assignee: Futaba Corporation
• Inventors: Takahashi, Hisamitsu, Hieda, Shigeru, Tanaka, Satoshi, Tsuruoka, Yoshihisa
• Granted Patent: US 6,887,592 B2
• Time in Patent Office: Days
• US Class Current: 428/690
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 50/841 Self-supporting sealing arrangements
• CPC Class Codes: H10K 50/846 comprising getter material or desiccants
• CPC Class Codes: H10K 59/871 Self-supporting sealing arrangements
• CPC Class Codes: H10K 59/872 Containers
• CPC Class Codes: H10K 59/874 including getter material or desiccant
• CPC Class Codes: Y10S 428/917 Electroluminescent
• CPC Class Codes: Y10T 428/23 Sheet including cover or casing
• CPC Class Codes: Y10T 428/239 Complete cover or casing

Abstract

An organic EL device having a drying medium capable of suppressing the growth of a dark spot equipped with a water-capturing medium layer for chemically capturing water placed on a water-capturing medium holding layer. The organic EL device is comprised of a sealed container having a glass substrate and a sealing cap bonded to the glass substrate. The sealed container is provided with a light emitting region formed on the substrate which is formed of organic EL material layers placed between a pair of opposite anode and cathode electrodes. The sealed container further includes a water-capturing medium holding layer provided on an inner surface of the container spaced apart from the light emitting region and a water-capturing medium holding layer.

Claims

1. An organic EL device comprising:

a sealed container having a glass substrate and a sealing cap bonded to said glass substrate;

a light emitting region formed on said substrate in said sealed container, said light emitting region being formed of organic EL material layers placed between a pair of opposite anode and cathode electrodes;

a water-capturing medium holding layer provided on an inner surface of said container spaced apart from said light emitting region; and

a water-capturing medium placed on the surface of said water-capturing medium holding layer.

2. An organic EL device as claimed in claim 1, wherein said sealing cap is composed of a hydrophilic material.

3. An organic EL device as claimed in claim 2, wherein said hydrophilic material is a plate glass.

4. An organic EL device as claimed in claim 1, wherein said water-capturing holding layer and water-capturing medium are comprised of a thin film of lipophilic material.

5. An organic EL device as claimed in claim 4, wherein said water-capturing medium holding layer is composed of lipophilic organic pigment.

6. An organic EL device as claimed in claim 5, wherein said organic pigment is selected from the group consisting of lake pigment, azolake pigment, insoluble azo pigment, condensed azo pigment, azo complex pigment, phthalocyanine pigment, condensed polycyclic pigment and fluorescent pigment.

7. An organic EL device as claimed in claim 1, wherein said water-capturing medium layer is comprised of thin film of organometallic compound represented by the following formula(1):

8. An organic EL device as claimed in claim 1, wherein said water-capturing agent layer is comprised of an organometallic complex compound represented by the following chemical formula(2):

9. An organic EL device as claimed in claim 1, wherein said water-capturing medium layer is comprised of an organometallic complex compound represented by the following formula(3):

10. An organic EL device as claimed in claim 1, wherein said water-capturing medium layer is a film formed by applying water-capturing medium layer forming liquid prepared by dispersing an inorganic drying medium in an organic solvent.

11. An organic EL device as claimed in claim 1, wherein said water-capturing medium layer is a mixture or combination of an inorganic drying agent with the organic water-capturing medium recited in claims 7 to 9.