ORGANIC LIGHT-EMITTING DEVICE AND METHOD OF MANUFACTURING THE SAME

• US 20110210348A1
• Filed: 03/09/2011
• Published: 09/01/2011
• Est. Priority Date: 03/01/2010
• Status: Active Grant

• Current Assignee: JDI Design and Development GK
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: YUASA, Hiroshi
• Granted Patent: US 8,604,490 B2
• Time in Patent Office: Days
• US Class Current: 257/88
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/818 Reflective anodes, e.g. ITO combined with thick metallic layers
• CPC Class Codes: H10K 50/841 Self-supporting sealing arrangements
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/846 comprising getter material or desiccants
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]

Abstract

An organic EL device includes a first substrate and a plurality of organic EL elements above a first portion of the first substrate. A first inorganic layer covers the plurality of organic EL elements. An active layer is above a second portion of the first substrate that is different than the first portion. The active layer comprises a material that is at least one of hygroscopic and oxidizable. A second inorganic layer covers the active layer. A second substrate is opposite the first substrate, with the plurality of organic EL elements being between the first and second substrates. A seal extends between the first and second substrates to define a sealed space between the first and second substrates. The second inorganic layer includes through-holes that expose the active layer to the sealed space that is defined by the first substrate, the second substrate, and the seal.

Claims

1. An organic EL device, comprising:

a first substrate;

a plurality of organic EL elements above a first portion of the first substrate;

a first inorganic layer that covers the plurality of organic EL elements;

an active layer above a second portion of the first substrate different than the first portion, the active layer comprising a material that is at least one of hygroscopic and oxidizable, the plurality of organic EL elements not being above the second portion;

a second inorganic layer that covers the active layer;

a second substrate opposite the first substrate, the plurality of organic EL elements being between the first substrate and the second substrate; and

a seal that extends between the first substrate and the second substrate to define a sealed space between the first substrate and the second substrate, wherein

the second inorganic layer includes through-holes that expose the active layer to the sealed space that is defined by the first substrate, the second substrate, and the seal.

2. The organic EL device of claim 1, wherein each of the through-holes comprises a through-crack.

3. The organic EL device of claim 1, wherein

the plurality of organic EL elements are arranged in a matrix, and

the active layer surrounds the plurality of organic EL elements.

4. The organic EL device of claim 1, wherein

the active layer comprises:

one of a group of an alkali metal, an alkaline-earth metal, an alkali metal oxide, an alkaline-earth metal oxide, an alkali metal fluoride, and an alkaline-earth metal fluoride; and

an organic substance that comprises one of the group and has a charge transport property.

5. An organic EL device, comprising:

a first substrate;

a plurality of organic EL elements above a first portion of the first substrate;

a first inorganic layer that covers the plurality of organic EL elements;

an active layer above a second portion of the first substrate different than the first portion, the active layer comprising a material that is at least one of hygroscopic and oxidizable, the plurality of organic EL elements not being above the second portion;

a second inorganic layer that covers the active layer;

a second substrate opposite the first substrate, the plurality of organic EL elements being between the first substrate and the second substrate; and

a seal that extends between the first substrate and the second substrate to define a sealed space between the first substrate and the second substrate, wherein

the second inorganic layer includes through-holes that expose the active layer to the sealed space that is defined by the first substrate, the second substrate, and the seal,

the second inorganic layer is formed above the active layer to cover the active layer,

the seal is formed between the first substrate and the second substrate to seal a gap between the first substrate and the second substrate, and

the through-holes are formed in the second inorganic layer to expose the active layer to the sealed space via the through-holes.

6. The organic EL device of claim 5, wherein each of the through-holes comprises a through-crack.

7. The organic EL device of claim 5, wherein

the plurality of organic EL elements are arranged in a matrix, and

the active layer surrounds the plurality of organic EL elements.

8. The organic EL device of claim 5, wherein

the active layer comprises:

one of a group of an alkali metal, an alkaline-earth metal, an alkali metal oxide, an alkaline-earth metal oxide, an alkali metal fluoride, and an alkaline-earth metal fluoride; and

an organic substance that comprises one of the group and has a charge transport property.

9. A method of manufacturing an organic EL device, comprising:

forming a plurality of organic EL elements above a first portion of a first substrate;

forming a first inorganic layer that covers the plurality of organic EL elements;

forming an active layer above a second portion of the first substrate different than the first portion with a material that is at least one of hygroscopic and oxidizable, the plurality of organic EL elements not being formed above the second portion;

forming a second inorganic layer that covers the active layer;

forming a seal that extends between the first substrate and a second substrate to define a sealed space between the first substrate and the second substrate, the second substrate being opposite the first substrate above the plurality of organic EL elements; and

forming through-holes in the second inorganic layer to expose the active layer, via the through-holes, to the sealed space defined by the first substrate, the second substrate, and the seal.

10. The method of manufacturing the organic EL device of claim 9, wherein the through-holes are formed by irradiating the second inorganic layer with a laser light.

11. The method of manufacturing the organic EL device of claim 10, further comprising:

forming, on the second area of the first substrate, a thermally expandable layer with a material that has a greater thermal expansion than a thermal expansion of the second inorganic layer after the first inorganic layer is formed and before the active layer is formed.

12. The method of manufacturing the organic EL device of claim 10, further comprising:

forming, on the second area of the first substrate, a light reflective layer with a material that reflects light after the first inorganic layer is formed and before the active layer is formed.

13. The method of manufacturing the organic EL device of claim 10, wherein the second inorganic layer comprises a material that absorbs light having a wavelength less than approximately 500 nm.

14. The method of manufacturing the organic EL device of claim 10, wherein the second substrate comprises a material that transmits light having a wavelength less than approximately 500 nm.

15. The method of manufacturing the organic EL device of claim 9, wherein

each of the plurality of organic EL elements includes a first functional layer,

the active layer and the first functional layer are formed with a same material,

the active layer and the first functional layer are formed in a same process,

the second inorganic layer and the first inorganic layer are formed with a same material, and

the second inorganic layer and the first inorganic layer are formed in a same process.

16. The method of manufacturing the organic EL device of claim 15, wherein the first functional layer comprises an electron transport layer.

17. The method of manufacturing the organic EL device of claim 15, wherein the through-holes are formed by irradiating the second inorganic layer with a laser light.

18. The method of manufacturing the organic EL device of claim 17, wherein

each of the plurality of organic EL elements further includes a second functional layer,

the second functional layer is formed before the first functional layer with a material that has a greater thermal expansion than a thermal expansion of the first functional layer,

the second functional layer and a thermally expandable layer are formed, on the second area of the first substrate, in a same process and with a same material as the second functional layer, and

the active layer is formed on the thermally expandable layer.

19. The method of manufacturing the organic EL device of claim 17, wherein

each of the plurality of organic EL elements further includes a second functional layer,

the second functional layer is formed before the first functional layer with a material that reflects light,

the second functional layer and a light reflective layer are formed, on the second area of the first substrate, in a same process and with a same material as the second functional layer, and

the active layer is formed on the light reflective layer.

20. The method of manufacturing the organic EL device of claim 17, wherein the second functional layer is an electrode.

21. The method of manufacturing the organic EL device of claim 9, wherein

the active layer comprises one of:

one of a group of an alkali metal, an alkaline-earth metal, an alkali metal oxide, an alkaline-earth metal oxide, an alkali metal fluoride, and an alkaline-earth metal fluoride, and

an organic substance that comprises one of the group and has a charge transport property.

22. The method of manufacturing the organic EL device of claim 17, wherein the second inorganic layer comprises a material that absorbs light having a wavelength less than approximately 500 nm.