Organic light-emitting element and light-emitting device with the organic light-emitting element

• US 8,624,484 B2
• Filed: 09/14/2011
• Issued: 01/07/2014
• Est. Priority Date: 12/26/2002
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Yamazaki, Hiroko, Seo, Satoshi
• Primary Examiner(s): Patel, Nimeshkumar
• Assistant Examiner(s): RAABE, CHRISTOPHER M
• Application Number:
  US13/232,122
• Publication Number:
  US 20120025253A1
• Time in Patent Office: 846 Days
• Field of Search: 313498-512, 315/169.3, 345/36, 345/45, 345/76
• US Class Current: 313/504
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/121 for assisting energy transfer, e.g. sensitization
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 50/131 with spacer layers between the electroluminescent layers
• CPC Class Codes: H10K 50/15 Hole transporting layers
• CPC Class Codes: H10K 50/16 Electron transporting layers
• CPC Class Codes: H10K 50/17 Carrier injection layers
• CPC Class Codes: H10K 50/171 Electron injection layers
• CPC Class Codes: H10K 50/18 Carrier blocking layers
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/82 Cathodes
• CPC Class Codes: H10K 50/828 Transparent cathodes, e.g. comprising thin metal layers
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/30 Devices specially adapted for multicolour light emission
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3
• CPC Class Codes: H10K 85/342 comprising iridium
• CPC Class Codes: H10K 85/626 containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
• CPC Class Codes: H10K 85/633 : comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom

Abstract

The present invention provides a white organic light-emitting element high in emission efficiency. In particular, the invention provides a white organic light-emitting element that has an emission spectrum having peaks in the respective wavelength regions of red color, green color and blue color and is high in emission efficiency.

Claims

1. A light emitting device comprising:

a transistor over a substrate;

a color filter over the substrate;

a light emitting element comprising;

a first electrode comprising a transparent conductive film and electrically connected to the transistor;

an electroluminescent layer over the first electrode, the electroluminescent layer comprising a first emission region and a second emission region over the first emission region; and

a second electrode over the electroluminescent layer; and

an insulator covering an end portion of the first electrode,

wherein the second emission region is located apart from the first emission region,

wherein the first emission region and the second emission region are overlapped with each other, and

wherein at least one of the first emission region and the second emission region comprises a phosphorescent material.

7. The light emitting device according to claim 1, further comprising a driver circuit comprising a second transistor over the substrate.

13. The light emitting device according to claim 1, further comprising a sealing substrate over the second electrode.

19. An electric appliance comprising the light emitting device according to claim 1, wherein the electric appliance is selected from the group consisting of a personal computer, a TV broadcast receiver, a billboard display, a note type personal computer, a mobile computer, a portable image reproducing device, a head-mount display, a video camera, a portable telephone and a double-sided emission type note type personal computer.

25. The light emitting device according to claim 1, wherein a distance between the first and second emission regions is 1 nm or more and 30 nm or less.

2. A light emitting device comprising:

a transistor over a substrate;

a color filter over the substrate;

a light emitting element comprising;

a first electrode comprising a transparent conductive film and electrically connected to the transistor;

an electroluminescent layer over the first electrode, the electroluminescent layer comprising a first emission region and a second emission region over the first emission region; and

a second electrode over the electroluminescent layer; and

an insulator covering an end portion of the first electrode,

wherein the second emission region is located apart from the first emission region,

wherein the first emission region and the second emission region are overlapped with each other,

wherein one of the first emission region and the second emission region comprises a phosphorescent material, and

wherein the other of the first emission region and the second emission region comprises a fluorescent material.

8. The light emitting device according to claim 2, further comprising a driver circuit comprising a second transistor over the substrate.

14. The light emitting device according to claim 2, further comprising a sealing substrate over the second electrode.

20. An electric appliance comprising the light emitting device according to claim 2, wherein the electric appliance is selected from the group consisting of a personal computer, a TV broadcast receiver, a billboard display, a note type personal computer, a mobile computer, a portable image reproducing device, a head-mount display, a video camera, a portable telephone and a double-sided emission type note type personal computer.

26. The light emitting device according to claim 2, wherein a distance between the first and second emission regions is 1 nm or more and 30 nm or less.

3. A light emitting device comprising:

a transistor over a substrate;

a color filter over the substrate; and

a light emitting element comprising;

a first electrode electrically connected to the transistor;

an electroluminescent layer over the first electrode, the electroluminescent layer comprising a first emission region and a second emission region over the first emission region; and

a second electrode over the electroluminescent layer,

wherein the light emitting device emits light through the first electrode,

wherein the first emission region and the second emission region are overlapped with each other, and

wherein at least one of the first emission region and the second emission region comprises a phosphorescent material.

9. The light emitting device according to claim 3, further comprising a driver circuit comprising a second transistor over the substrate.

15. The light emitting device according to claim 3, further comprising a sealing substrate over the second electrode.

21. An electric appliance comprising the light emitting device according to claim 3, wherein the electric appliance is selected from the group consisting of a personal computer, a TV broadcast receiver, a billboard display, a note type personal computer, a mobile computer, a portable image reproducing device, a head-mount display, a video camera, a portable telephone and a double-sided emission type note type personal computer.

27. The light emitting device according to claim 3, wherein a distance between the first and second emission regions is 1 nm or more and 30 nm or less.

4. A light emitting device comprising:

a transistor over a substrate;

a color filter over the substrate; and

a light emitting element comprising;

a first electrode electrically connected to the transistor;

an electroluminescent layer over the first electrode, the electroluminescent layer comprising a first emission region and a second emission region over the first emission region; and

a second electrode over the electroluminescent layer,

wherein the light emitting device emits light through the first electrode,

wherein the first emission region and the second emission region are overlapped with each other,

wherein one of the first emission region and the second emission region comprises a phosphorescent material, and

wherein the other of the first emission region and the second emission region comprises a fluorescent material.

10. The light emitting device according to claim 4, further comprising a driver circuit comprising a second transistor over the substrate.

16. The light emitting device according to claim 4, further comprising a sealing substrate over the second electrode.

22. An electric appliance comprising the light emitting device according to claim 4, wherein the electric appliance is selected from the group consisting of a personal computer, a TV broadcast receiver, a billboard display, a note type personal computer, a mobile computer, a portable image reproducing device, a head-mount display, a video camera, a portable telephone and a double-sided emission type note type personal computer.

28. The light emitting device according to claim 4, wherein a distance between the first and second emission regions is 1 nm or more and 30 nm or less.

5. A light emitting device comprising:

a transistor over a substrate;

a color filter over the substrate; and

a light emitting element comprising;

a first electrode comprising a transparent conductive film, the first electrode being electrically connected to the transistor;

an electroluminescent layer over the first electrode, the electroluminescent layer comprising a first emission region and a second emission region over the first emission region; and

a second electrode over the electroluminescent layer,

wherein the first emission region and the second emission region are overlapped with each other,

wherein one of the first emission region and the second emission region comprises a host material and a fluorescent material dispersed in the host material, and

wherein the other of the first emission region and the second emission region comprises a phosphorescent material.

11. The light emitting device according to claim 5, further comprising a driver circuit comprising a second transistor over the substrate.

17. The light emitting device according to claim 5, further comprising a sealing substrate over the second electrode.

23. An electric appliance comprising the light emitting device according to claim 5, wherein the electric appliance is selected from the group consisting of a personal computer, a TV broadcast receiver, a billboard display, a note type personal computer, a mobile computer, a portable image reproducing device, a head-mount display, a video camera, a portable telephone and a double-sided emission type note type personal computer.

29. The light emitting device according to claim 5, wherein a distance between the first and second emission regions is 1 nm or more and 30 nm or less.

6. A light emitting device comprising:

a transistor over a substrate;

a color filter over the substrate;

a light emitting element comprising;

a first electrode electrically connected to the transistor;

an electroluminescent layer over the first electrode, the electroluminescent layer comprising a first emission region and a second emission region over the first emission region; and

a second electrode over the electroluminescent layer,

wherein the first emission region and the second emission region are overlapped with each other,

wherein the light emitting device emits light through the first electrode,

wherein one of the first emission region and the second emission region comprises a host material and a fluorescent material dispersed in the host material, and

wherein the other of the first emission region and the second emission region comprises a phosphorescent material.

12. The light emitting device according to claim 6, further comprising a driver circuit comprising a second transistor over the substrate.

18. The light emitting device according to claim 6, further comprising a sealing substrate over the second electrode.

24. An electric appliance comprising the light emitting device according to claim 6, wherein the electric appliance is selected from the group consisting of a personal computer, a TV broadcast receiver, a billboard display, a note type personal computer, a mobile computer, a portable image reproducing device, a head-mount display, a video camera, a portable telephone and a double-sided emission type note type personal computer.

30. The light emitting device according to claim 6, wherein a distance between the first and second emission regions is 1 nm or more and 30 nm or less.