White organic light emitting display device and organic light emitting display apparatus using the same

Patent metadata

Field	Value
Publication number	US-9680119-B2
Application number	US-201514848168-A
Country	US
Kind code	B2
Filing date	Sep 8, 2015
Priority date	Oct 28, 2014
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

Disclosed is a white organic light emitting display device comprising first and second electrodes, and a first emitting part between the first and second electrodes, the first emitting part including a red emitting layer and a blue emitting layer adjacent to the red emitting layer, wherein the red emitting layer includes a first host material which does not absorb a blue light emitted from the blue emitting layer, and an organic light emitting display apparatus using the same.

First claim

What is claimed is:

1. A white organic light emitting display device comprising:
first and second electrodes; and
a first emitting part between the first and second electrodes, the first emitting part including a red emitting layer and a blue emitting layer adjacent to the red emitting layer, wherein the red emitting layer includes a first host material which does not absorb a blue light emitted from the blue emitting layer.

2. The white organic light emitting display device according to claim 1 , wherein an energy band gap of the first host material is no less than 2.7 eV.

3. The white organic light emitting display device according to claim 1 , wherein the first host material includes an organic material having a hole transporting property.

4. The white organic light emitting display device according to claim 3 , wherein an energy band gap of the organic material having the hole transporting property is within a range of 2.8 eV to 3.5 eV.

5. The white organic light emitting display device according to claim 1 , wherein the first host material includes a host material of the blue emitting layer.

6. The white organic light emitting display device according to claim 1 , wherein an energy band gap of a host material of the blue emitting layer is no more than a value of 0.3 eV more than an energy band gap of the first host material.

7. The white organic light emitting display device according to claim 1 , wherein the red emitting layer further includes a second host material, an energy band gap of the second host material being different from that of the first host material.

8. The white organic light emitting display device according to claim 7 , wherein the energy band gap of the second host material is within a range of 2.2 eV to 2.4 eV.

9. The white organic light emitting display device according to claim 7 , wherein a weight ratio of the first host material to the second host material is 7˜8:2˜3.

10. The white organic light emitting display device according to claim 1 , wherein the first electrode is an anode, the second electrode is a cathode, and the blue emitting layer is more adjacent to the second electrode in comparison to the red emitting layer.

11. The white organic light emitting display device according to claim 1 , further comprising an emission adjusting part between the red emitting layer and the blue emitting layer, the emission adjusting part including an organic material having hole transporting property.

12. The white organic light emitting display device according to claim 1 , further comprising a second emitting part having a first peak wavelength between the first electrode and the first emitting part and a third emitting part having a second peak wavelength on the second emitting part, wherein the first emitting part, the second emitting part and the third emitting part include a TER-TEP (Three Emission Region-Three Emission Peak) structure.

13. The white organic light emitting display device according to claim 12 ,
wherein the first peak wavelength is within a range of 440 nm to 480 nm, the second peak wavelength is within a range of 520 nm to 590 nm, and peak wavelengths of the red emitting layer and the blue emitting layer are within a range of 600 nm to 650 nm and 440 nm to 480 nm.

14. The white organic light emitting display device according to claim 13 , wherein the second emitting part having the first peak wavelength is closest to the first electrode, and the first emitting part having the red emitting layer and the blue emitting layer is closest to the second electrode.

15. A white organic light emitting display device comprising:
first and second electrodes;
a first emitting part between the first and second electrodes;
a second emitting part on the first emitting part; and
a third emitting part on the second emitting part,
wherein at least one among the first, second and third emitting parts includes two emitting layers having a red emitting layer and a blue emitting layer, and the red emitting layer includes at least two host materials that have different energy band gaps so as to improve emission efficiency of the red emitting layer and the blue emitting layer.

16. The white organic light emitting display device according to claim 15 , wherein an energy band gap of a host material of the blue emitting layer is no more than a value of 0.30 eV more than the energy band gap of any one host material in the red emitting layer.

17. The white organic light emitting display device according to claim 15 , wherein any one host material in the red emitting layer includes an organic material having a hole transporting property.

18. The white organic light emitting display device according to claim 15 , wherein the red emitting layer and the blue emitting layer are adjacent to each other.

19. The white organic light emitting display device according to claim 15 , wherein the first electrode is an anode, the second electrode is a cathode, and the blue emitting layer is closer to the second electrode than the red emitting layer.

20. The white organic light emitting display device according to claim 15 , wherein the third emitting part includes the red emitting layer and the blue emitting layer, and the blue emitting layer is closer to the second electrode than the red emitting layer.

21. The white organic light emitting display device according to claim 20 ,
wherein a wavelength of the first emitting part is within a range of 440 nm to 480 nm, a wavelength of the second emitting part is within a range of 520 nm to 590 nm, and a wavelength of the third emitting part is within a range of 600 nm to 650 nm and 440 nm to 480 nm.

22. The white organic light emitting display device according to claim 15 , further comprising:
a first charge generation layer between the first emitting part and the second emitting part; and
a second charge generation layer between the second emitting part and the third emitting part.

23. An organic light emitting display apparatus comprising:
a white organic light emitting display device for emitting a white light, the white organic light emitting display device on a substrate;
an encapsulation layer on the white organic light emitting display device; and
a color filter layer for transmitting light with a predetermined wavelength in the white light emitted from the white organic light emitting display device,
wherein the white organic light emitting display device includes:
first and second electrodes; and
an emitting part between the first and second electrodes, the emitting part including a red emitting layer and a blue emitting layer adjacent to the red emitting layer,
wherein the red emitting layer includes a first host material which does not absorb a blue light emitted from the blue emitting layer.

24. The white organic light emitting display device according to claim 23 , wherein the first host material includes an organic material having a hole transporting property.

25. The white organic light emitting display device according to claim 23 , wherein an energy band gap of the first host material is no less than 2.7 eV.

26. The white organic light emitting display device according to claim 23 , wherein the red emitting layer further includes a second host material, and an energy band gap of the second host material is within a range of 2.2 eV to 2.4 eV.

27. The white organic light emitting display device accor

Assignees

• Lg Display Co Ltd

Inventors

• Park Jung Soo
• Choi Hong Seok
• Joung Seung Ryong
• Ahn Soyeon
• Lee Min Gyu

Classifications

• H10K59/873

  Encapsulations · CPC title

• H10K50/13

  comprising stacked EL layers within one EL unit · CPC title

• H10K50/11 Primary

  characterised by the electroluminescent [EL] layers · CPC title

• H01L51/5212

  Electricity · mapped topic

• H01L51/5253

  Electricity · mapped topic