# US 2001/0044035 A1 · Organic EL element and method of manufacturing the same

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- Number: US 2001/0044035 A1
- Document ID: US20010044035A1
- Status: Published application
- Kind: A1
- Application number: 09/811,618
- Filed: 2001-03-20
- Published: 2001-11-22
- Earliest claimed: 2000-03-21
- Assignees: Seika Epson Corporation
- Inventors: Katsuyuki Morii
- Web page: https://patentgrep.com/patent/US20010044035A1

## CPC

- H05B 33/04: Sealing arrangements {, e.g. against humidity}
- H05B 33/10: Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
- H10K 50/8426: {Peripheral sealing arrangements, e.g. adhesives, sealants}
- H10K 50/844: Encapsulations
- H10K 50/826: Multilayers, e.g. opaque multilayers
- Y10S 428/917: Electroluminescent
- Y10T 428/31511: Of epoxy ether
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

To seal an organic EL element satisfactorily, even when light is radiated from both electrode sides in the organic EL element. Laminate 20 is formed on transparent substrate 1. Laminate 20 includes transparent electrode 2, hole injecting and transporting layer 3, light emitting layer 4, and cathode 5. The top face of cathode 5 of laminate 20 and the end face of laminate 20 are covered by fist sealing layer 6 comprising LiF. The outer side of first sealing layer 6 is covered by second sealing layer 7 comprising an epoxy resin.

## Claims

### Claim 1

An organic EL element comprising a substrate and a laminate formed on said substrate, said laminate having a structure including a cathode, an anode, and a light emitting layer, said light emitting layer comprising an organic material and being sandwiched between said cathode and anode, and at least the face of the laminate on the opposite side to the substrate side being sealed by a sealant having a two-layer structure including an inner first sealing layer and an outer second sealing layer, wherein
said first sealing layer comprising a halide of an alkali metal or alkaline earth metal, and said second sealing layer comprising a moisture proof resinous material.

### Claim 2 (depends on 1)

An organic EL element according to claim 1, wherein said first sealing layer comprises lithium fluoride (LiF).

### Claim 3 (depends on 1, 2)

An organic EL element according to claim 1 or 2, wherein said second sealing layer comprises an epoxy resin.

### Claim 4 (depends on 1, 2, 3)

An organic EL element according to any one of claims 1 to 3, wherein the electrode arranged in the laminate on the opposite side to the substrate side is formed with a material containing calcium (Ca).

### Claim 5 (depends on 1, 2, 3, 4)

An organic EL element according to any one of claims 1 to 4, wherein said first sealing layer has a thickness of not less than 300 angstroms.

### Claim 6

A method of manufacturing an organic EL element, comprising the steps of:
forming a laminate on a substrate, said laminate having a structure including a cathode, an anode, and a light emitting layer, said light emitting layer being comprising an organic material and being sandwiched between said cathode and anode;
forming a first sealing layer at least on the face of the formed laminate on the opposite side to the substrate side in an atmosphere being substantially free from oxygen and water, said first sealing layer being comprising a halide of an alkali metal or alkaline earth metal; and
forming a second sealing layer on the outer side of the first sealing layer in an atmosphere being substantially free from oxygen and water, said second sealing layer comprising a moisture proof resinous material.

### Claim 7 (depends on 6)

A method of manufacturing an organic EL element according to claim 6, wherein a layer comprising lithium fluoride (LiF) is formed as the first sealing layer.

### Claim 8 (depends on 6, 7)

A method of manufacturing an organic EL element according to claim 6 or 7, wherein a layer comprising an epoxy resin is formed as the second sealing layer.

### Claim 9 (depends on 6, 7, 8)

A method of manufacturing an organic EL element according to any one of claims 6 to 8, wherein a layer comprising a material containing calcium (Ca) is formed as an electrode arranged in the laminate on the opposite side to the substrate side.

### Claim 10 (depends on 6, 7, 8, 9)

A method of manufacturing an organic EL element according to any one of claims 6 to 9, wherein the first sealing layer comprising LiF is formed by vacuum deposition method in the condition that a film-forming rate is not less than 8 angstroms per 1 second.

### Claim 11 (depends on 6, 7, 8, 9, 10)

A method of manufacturing an organic EL element according to any one of claims 6 to 10, wherein the first sealing layer is formed to a thickness of not less than 300 angstroms.