Light emitting device and method of manufacturing thereof

• US 7,485,584 B2
• Filed: 02/16/2007
• Issued: 02/03/2009
• Est. Priority Date: 05/21/2001
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Seo, Satoshi, Yamazaki, Shunpei
• Primary Examiner(s): MANDALA, MICHELLE
• Application Number:
  US11/707,099
• Publication Number:
  US 20070275490A1
• Time in Patent Office: 718 Days
• Field of Search: 438/149, 438/237, 438/328, 438/780, 438/949, 438/FOR.157, 438/FOR.201, 438/FOR.287, 438/FOR.416, 427/66, 427/447, 427/421.1, 427/427.5, 257/E51.018, 257/E51.022, 257/E51.026, 257/E31.099, 257/E31.105
• US Class Current: 438/780
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 71/13 using printing techniques, e.g. ink-jet printing or screen printing
• 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 85/113 Heteroaromatic compounds comprising sulfur or selene, e.g. polythiophene
• CPC Class Codes: H10K 85/114 Poly-phenylenevinylene; Derivatives thereof
• CPC Class Codes: H10K 85/115 Polyfluorene; Derivatives thereof
• CPC Class Codes: H10K 85/341 Transition metal complexes, e.g. Ru(II)polypyridine complexes H10K85/331 takes precedence
• CPC Class Codes: H10K 85/60 Organic compounds having low molecular weight H10K85/10 - H10K85/50 take precedence

Abstract

A device of forming a film from an organic compound material at low cost is provided, using an organic compound material having high light emission efficiency. An organic compound film is formed on a substrate under an inert gas atmosphere by spraying of a colloid solution in which organic compound aggregates are dispersed (this solution is also referred to as a “sol”). Note that the organic compound may be one in which particles are composed of aggregates of several organic compounds within a liquid, and may be one in which a portion of the organic compound is dissolved within a liquid.

Claims

1. A method of manufacturing a light emitting device comprising:

forming a film containing an organic compound by spraying a composition and an inert gas from a nozzle onto an object,

wherein the composition comprises a low molecular weight compound dispersed in a liquid, and

wherein the low molecular weight compound is capable of emitting light.

2. A method according to claim 1, wherein the composition is a liquid having fluidity.

3. A method according to claim 1, wherein the low molecular weight compound is one compound or a plurality of compounds selected from the group consisting of quinacridon, tris(2-phenylpyridine) iridium, and basocuproin.

4. A method according to claim 1, wherein the liquid is one liquid or a plurality of liquids, selected from the group consisting of alcohols, toluene, and water.

5. A method according to claim 1, wherein the step of forming the film by spraying is performed under an inert gas atmosphere.

6. A method according to claim 1, wherein the nozzle is provided with one or more spray outlets.

7. A method according to claim 1, wherein the object is a substrate on which a switching element is formed.

8. A method according to claim 1, wherein the film is formed on the object while moving the object.

9. A method according to claim 1, wherein the film is formed on the object while moving the nozzle.

10. A method according to claim 1, wherein an electric field is generated between the nozzle and the object.

11. A method of manufacturing a light emitting device comprising:

forming a film containing an organic compound by spraying a composition and an inert gas from a nozzle onto an object,

wherein the composition is dispersed in a liquid,

wherein the organic compound is capable of emitting light.

12. A method according to claim 11, wherein the composition is a liquid having fluidity.

13. A method according to claim 11, wherein the liquid is one liquid or a plurality of liquids, selected from the group consisting of alcohols, toluene, and water.

14. A method according to claim 11, wherein the step of forming the film by spraying is performed under an inert gas atmosphere.

15. A method according to claim 11, wherein the nozzle is provided with one or more spray outlets.

16. A method according to claim 11, wherein the object is a substrate on which a switching element is formed.

17. A method according to claim 11, wherein the film is formed on the object while moving the object.

18. A method according to claim 11, wherein the film is formed on the object while moving the nozzle.

19. A method according to claim 11, wherein an electric field is generated between the nozzle and the object.