Organic light emitting element and light emitting device using the element

• US 7,567,031 B2
• Filed: 03/09/2007
• Issued: 07/28/2009
• Est. Priority Date: 06/01/2001
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Seo, Satoshi, Yamazaki, Shunpei, Murakami, Masakazu
• Primary Examiner(s): MACCHIAROLO, PETER J
• Application Number:
  US11/716,004
• Publication Number:
  US 20070159079A1
• Time in Patent Office: 872 Days
• Field of Search: 313/504, 313/506, 313/509, 428/917, 428/690
• US Class Current: 313/506
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

An organic light emitting element which can employ non-sublimable (non-volatile) or insoluble materials while keeping the same level of light emission as prior art is provided. Dispersive particles (202a) of an insoluble organic material that is dispersed in a solvent (201) in which a soluble organic material (203a) is dissolved is applied to a substrate (200) that has an electrode. Then, the solvent (201) is vaporized by heat treatment to form a uniform film (203b) of the soluble organic material in which aggregations (clusters) of the insoluble organic material are scattered. Since the soluble organic material film (203b) is thoroughly uniform. defects such as breakdown can be avoided to make it a fully functional organic light emitting element.

Claims

1. A passive matrix light emitting device comprising:

a light emitting element, the light emitting element comprising;

a scanning line;

a data line; and

an organic compound layer sandwiched between the scanning line and the data line, the organic compound layer comprising at least one host material and at least one guest material, and the host material and the guest material including an organic compound,

wherein the host material forms an amorphous film and the guest material is scattered in the amorphous film in the form of granules which are aggregations of material molecules, the granules having a diameter smaller than a thickness of the organic compound layer, and

wherein the host material is soluble in an organic solvent and the guest material is insoluble in the organic solvent.

2. The passive matrix light emitting device according to claim 1, wherein the guest material is a luminous material.

3. The passive matrix light emitting device according to claim 1, wherein the guest material is a material that emits light when returning from triplet excitation.

4. The passive matrix light emitting device according to claim 1, wherein the host material is a material which is a high molecular weight material.

5. The passive matrix light emitting device according to claim 1, wherein the guest material comprises at least one selected from the group consisting of a pigment, a condensed polycyclic organic compound, an orthometal complex of iridium, and a conjugate polymer having no substituent.

6. The passive matrix light emitting device according to claim 1, wherein the guest material comprises at least one selected from the group consisting of Qd, CuPc, BCP, Ir(ppy)3, PPV, PNV, Phenyl-PPV, PT, PPT, PPP, and PF.

7. The passive matrix light emitting device according to claim 1, wherein the host material comprises at least one selected from the group consisting of RO-PPV and PVK.

8. The passive matrix light emitting device according to claim 1, wherein the host material comprises at least one selected from the group consisting of a conjugate polymer having a substituent, a pendant polymer having a conjugate material for its side chain, and a low molecular weight material soluble in solvents.

9. The passive matrix light emitting device according to claim 1, wherein the organic compound layer is formed by applying a solution including the host material and the guest material by spin coating.

10. An electric appliance comprising the passive matrix light emitting device of claim 1, wherein the electric appliance is selected from the group consisting of a video camera, a digital still camera, a lap-top computer, a personal computer, a goggle type display, a mobile telephone, a navigation system, an audio reproducing device, a portable computer, a game machine, a portable information terminal, and an image reproducing apparatus.

11. A passive matrix light emitting device comprising:

a light emitting element, the light emitting element comprising;

a scanning line;

a data line; and

an organic compound layer placed between the scanning line and the data line, the organic compound layer comprising at least a first organic compound and a second organic compound,

wherein the first organic compound forms an amorphous film and the second organic compound is scattered in the amorphous film in the form of granules which are aggregations of material molecules, the granules having a diameter smaller than a thickness of the organic compound layer, and

wherein the first organic compound is soluble in a solvent and the second organic compound is insoluble in the solvent.

12. The passive matrix light emitting device according to claim 11, wherein the second organic compound emits fluorescent light or phosphorescent light.

13. The passive matrix light emitting device according to claim 11, wherein the organic compound layer has a thickness of 1 nm or more and 1 μ

m or less.

14. The passive matrix light emitting device according to claim 11, wherein the second organic compound comprises at least one selected from the group consisting of a pigment, a condensed polycyclic organic compound, an orthometal complex of iridium, and a conjugate polymer having no substituent.

15. The passive matrix light emitting device according to claim 11, wherein the second organic compound comprises at least one selected from the group consisting of Qd, CuPc, BCP, Ir(ppy)3, PPV, PNV, Phenyl-PPV, PT, PPT, PPP, and PF.

16. The passive matrix light emitting device according to claim 11, wherein the first organic compound comprises at least one selected from the group consisting of RO-PPV and PVK.

17. The passive matrix light emitting device according to claim 11, wherein the first organic compound comprises at least one selected from the group consisting of a conjugate polymer having a substituent, a pendant polymer having a conjugate material for its side chain, and a low molecular weight material soluble in solvents.

18. The passive matrix light emitting device according to claim 11, wherein the organic compound layer is formed by applying a solution including the first organic compound and the second organic compound by spin coating.

19. An electric appliance comprising the passive matrix light emitting device of claim 11, wherein the electric appliance is selected from the group consisting of a video camera, a digital still camera, a lap-top computer, a personal computer, a goggle type display, a mobile telephone, a navigation system, an audio reproducing device, a portable computer, a game machine, a portable information terminal, and an image reproducing apparatus.

20. A passive matrix light emitting device comprising:

a scanning line;

a data line;

a bank which separates the data line; and

an organic compound layer sandwiched between the scanning line and the data line, the organic compound layer comprising at least one host material and at least one guest material, and the host material and the guest material including an organic compound,

wherein the host material forms an amorphous film and the guest material is scattered in the amorphous film in the form of granules which are aggregations of material molecules, the granules having a diameter smaller than a thickness of the organic compound layer, and

wherein the host material is soluble in an organic solvent and the guest material is insoluble in the organic solvent.

21. The passive matrix light emitting device according to claim 20, wherein the guest material is a luminous material.

22. The passive matrix light emitting device according to claim 20, wherein the guest material is a material that emits light when returning from triplet excitation.

23. The passive matrix light emitting device according to claim 20, wherein the host material is a material which is a high molecular weight material.

24. The passive matrix light emitting device according to claim 20, wherein the guest material comprises at least one selected from the group consisting of a pigment, a condensed polycyclic organic compound, an orthometal complex of iridium, and a conjugate polymer having no substituent.

25. The passive matrix light emitting device according to claim 20, wherein the guest material comprises at least one selected from the group consisting of Qd, CuPc, BCP, Ir(ppy)3, PPV, PNV, Phenyl-PPV, PT, PPT, PPP, and PF.

26. The passive matrix light emitting device according to claim 20, wherein the host material comprises at least one selected from the group consisting of RO-PPV and PVK.

27. The passive matrix light emitting device according to claim 20, wherein the host material comprises at least one selected from the group consisting of a conjugate polymer having a substituent, a pendant polymer having a conjugate material for its side chain, and a low molecular weight material soluble in solvents.

28. The passive matrix light emitting device according to claim 20, wherein the organic compound layer is formed by applying a solution including the host material and the guest material by spin coating.

29. An electric appliance comprising the passive matrix light emitting device of claim 20, wherein the electric appliance is selected from the group consisting of a video camera, a digital still camera, a lap-top computer, a personal computer, a goggle type display, a mobile telephone, a navigation system, an audio reproducing device, a portable computer, a game machine, a portable information terminal, and an image reproducing apparatus.

30. A passive matrix light emitting device comprising:

a scanning line;

a data line;

a bank which separates the data line; and

an organic compound layer placed between the scanning line and the data line, the organic compound layer comprising at least a first organic compound and a second organic compound,

wherein the first organic compound forms an amorphous film and the second organic compound is scattered in the amorphous film in the form of granules which are aggregations of material molecules, the granules having a diameter smaller than a thickness of the organic compound layer, and

wherein the first organic compound is soluble in a solvent and the second organic compound is insoluble in the solvent.

31. The passive matrix light emitting device according to claim 30, wherein the second organic compound emits fluorescent light or phosphorescent light.

32. The passive matrix light emitting device according to claim 30, wherein the organic compound layer has a thickness of 1 nm or more and 1 μ

m or less.

33. The passive matrix light emitting device according to claim 30, wherein the second organic compound comprises at least one selected from the group consisting of a pigment, a condensed polycyclic organic compound, an orthometal complex of iridium, and a conjugate polymer having no substituent.

34. The passive matrix light emitting device according to claim 30, wherein the second organic compound comprises at least one selected from the group consisting of Qd, CuPc, BCP, Ir(ppy)3, PPV, PNV, Phenyl-PPV, PT, PPT, PPP, and PF.

35. The passive matrix light emitting device according to claim 30, wherein the first organic compound comprises at least one selected from the group consisting of RO-PPV and PVK.

36. The passive matrix light emitting device according to claim 30, wherein the first organic compound comprises at least one selected from the group consisting of a conjugate polymer having a substituent, a pendant polymer having a conjugate material for its side chain, and a low molecular weight material soluble in solvents.

37. The passive matrix light emitting device according to claim 30, wherein the organic compound layer is formed by applying a solution including the first organic compound and the second organic compound by spin coating.

38. An electric appliance comprising the passive matrix light emitting device of claim 30, wherein the electric appliance is selected from the group consisting of a video camera, a digital still camera, a lap-top computer, a personal computer, a goggle type display, a mobile telephone, a navigation system, an audio reproducing device, a portable computer, a game machine, a portable information terminal, and an image reproducing apparatus.