White LED with two blue layers and a yellow layer and the display panel thereof

Patent metadata

Field	Value
Publication number	US-10411213-B2
Application number	US-201715739704-A
Country	US
Kind code	B2
Filing date	Jul 21, 2017
Priority date	Jul 3, 2017
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

The present disclosure relates to a white light OLED and a display panel. The OLED includes a first electrode, a first hole injection layer, a first hole transport layer, a first luminous layer, a first electron transport layer, a charge generation layer, a second hole injection layer, a second hole transport layer, an electron blocking layer, a second luminous layer, a third luminous layer, a second electron transport layer, and a second electrode stacked in sequence. The first luminous layer is a blue luminous layer, the second luminous layer is a blue luminous layer, and the third luminous layer is a yellow luminous layer. With such configuration, the color shift and the power consumption issue caused by insufficient blue light may be effectively overcome.

First claim

What is claimed is:

1. A white light organic light-emitting diode (OLED), comprising:
a first electrode, a first hole injection layer, a first hole transport layer, a first luminous layer, a first electron transport layer, a charge generation layer, a second hole injection layer, a second hole transport layer, an electron blocking layer, a second luminous layer, a third luminous layer,
a second electron transport layer, and a second electrode stacked in sequence;
wherein the first luminous layer is a blue luminous layer, the second luminous layer is a blue luminous layer, and the third luminous layer is a yellow luminous layer;
the second luminous layer is configured on one side of the third luminous layer facing away the second electrode;
the first hole injection layer, the first hole transport layer, the first luminous layer, the first electron transport layer, the first charge generation layer, the second hole injection layer, the second hole transport layer, the electron blocking layer, the second luminous layer, the third luminous layer, and the second electron transport layer, and the second electrode is formed by a vapor deposition in sequence;
the first electron transport layer is made of 1,3-bis (3,5-di(pyridin-3-yl)phenyl); and
the second electron transport layer is made of a layer of 1,3-bis (3,5-di(pyridin-3-yl)phenyl)benzene and a layer of lithium fluoride.

2. The OLED as claimed in claim 1 , wherein:
a thickness of the second luminous layer is smaller than the thickness of the first luminous layer; and
the thickness of the second luminous layer is smaller than the thickness of the third luminous layer.

3. A white light organic light-emitting diode (OLED), comprising:
a first electrode, a first hole injection layer, a first hole transport layer, a first luminous layer, a first electron transport layer, a charge generation layer, a second hole injection layer, a second hole transport layer, an electron blocking layer, a second luminous layer, a third luminous layer,
a second electron transport layer, and a second electrode stacked in sequence;
wherein the first luminous layer is a blue luminous layer, the second luminous layer is a blue luminous layer, and the third luminous layer is a yellow luminous layer;
the first electron transport layer is made of 1,3-bis (3,5-di(pyridin-3-yl)phenyl); and
the second electron transport layer is made of a layer of 1,3-bis (3,5-di(pyridin-3-yl)phenyl)benzene and a layer of lithium fluoride.

4. The OLED as claimed in claim 3 , wherein the second luminous layer is configured on one side of the third luminous layer facing away the second electrode.

5. The OLED as claimed in claim 4 , wherein:
a thickness of the second luminous layer is smaller than the thickness of the first luminous layer; and
the thickness of the second luminous layer is smaller than the thickness of the third luminous layer.

6. The OLED as claimed in claim 3 , wherein:
the second luminous layer is made by a mixture of 2-methyl-9,10-bis (naphthalen-2-yl) anthracene and 3% of 4,4′-(1,4-phenylenedi-(1E)-2, 1-ethylene diyl) bis (N, N-diphenylbenzenamine);
the third luminous layer is made by a mixture of 2,6-bis (3-(9H-carbazol-9-yl) phenyl) pyridine and bis (2-phenylbenzothiazole)(acetylacetonate).

7. The OLED as claimed in claim 3 , wherein:
the second luminous layer is made by 9 phenyl-3,6-bis [4-(1-phenyl-1H-benzimidazolazole-2-) phenyl]-9H-carbazole;
the third luminous layer is made by a mixture of 9-phenyl-3,6-bis [4-(1-phenyl-1H-benzimidazolazole-2-) phenyl]-9H-carbazole and bis (2-phenylbenzothiazole)(acetylacetonate).

8. The OLED as claimed in claim 3 , wherein the first hole injection layer, the first hole transport layer, the first luminous layer, the first electron transport layer, the first charge generation layer, the second hole injection layer, the second hole transport layer, the electron blocking layer, the second luminous layer, the third luminous layer, and the second electron transport layer, and the second electrode is formed by a vapor deposition in sequence.

9. The OLED as claimed in claim 3 , wherein the first electrode is made of indium tin oxide (ITO) transparent semiconductor material, and the second electrode is made of metallic aluminum.

10. The OLED as claimed in claim 3 , wherein:
the first luminescent layer is made by a mixture of 9,10-bis (2-naphthyl)-2-methylanthracene with 3% 4,4′-(1,4-phenylenedi-(1E)-2, 1-ethylene diyl) bis (N, N-diphenylbenzenamine).

11. The OLED as claimed in claim 3 , wherein:
the first hole injection is made by molybdenum trioxide;
the first hole transport layer is made of N, N-Bis-phenyl-N, N-bis-(2-naphthyl)-(1,1-biphenyl)-4,4-diamine;
the first charge generation layer is made of a mixture of 1,3-bis (3,5-di(pyridin-3-yl)phenyl)benzene and 10% lithium;
the second hole transport layer is made of N, N-Bis-phenyl-N, N-bis-(2-naphthyl)-(1,1-biphenyl)-4,4-diamine;
the electron blocking layer is made of 4,4′, 4″-tris (carbazol-9-yl) triphenylamine.

12. A display panel having a plurality of OLEDs,
each of the OLEDs respectively comprising: a first electrode, a first hole injection layer, a first hole transport layer, a first luminous layer, a first electron transport layer, a charge generation layer, a second hole injection layer, a second hole transport layer, an electron blocking layer, a second luminous layer, a third luminous layer, a second electron transport layer, and a second electrode stacked in sequence;
wherein the first luminous layer is a blue luminous layer, the second luminous layer is a blue luminous layer, and the third luminous layer is a yellow luminous layer;
the first electron transport layer is made of 1,3-bis (3,5-di(pyridin-3-yl)phenyl); and
the second electron transport layer is made of a layer of 1,3-bis (3,5-di(pyridin-3-yl)phenyl)benzene and a layer of lithium fluoride.

13. The display panel as claimed in claim 12 , wherein the second luminous layer is configured on one side of the third luminous layer facing away the second electrode.

14. The display panel as claimed in claim 13 , wherein:
a thickness of the second luminous layer is smaller than the thickness of the first luminous layer; and
the thickness of the second luminous layer is smaller than the thickness of the third luminous layer.

15. The display panel as claimed in claim 12 , wherein:
the second luminous layer is made by a mixture of 2-methyl-9,10-bis (naphthalen-2-yl) anthracene and 3% of 4,4′-(1,4-phenylenedi-(1E)-2, 1-ethylene diyl) bis (N, N-diphenylbenzenamine);
the third luminous layer is made by a mixture of 2,6-bis (3-(9H-carbazol-9-yl) phenyl) pyridine and bis (2-phenylbenzothiazole)(acetylacetonate).

16. The display panel as claimed in claim 12 , wherein:
the second luminous layer is made by 9 phenyl-3,6-bis [4-(1-phenyl-1H-benzimidazolazole-2-) phenyl]-9H-carbazole;
the third luminous layer is made by a mixture of 9-phenyl-3,6-bis [4-(1-phenyl-1H-benzimidazolazole-2-) phenyl]-9H-carbazole and bis (2-phenylbenzothiazole)(acetylacetonate).

17. The display panel as claimed in claim 12 , wherein the first hole injection layer, the first hole transport layer, the first luminous layer, the first electron transport layer, the first charge generation layer, the second hole injection layer, the second hole transport layer, the electron blocking layer, the second luminous layer, the third luminous layer, and the second electron transport layer, and the second electrode is formed by a vapor deposition in sequence.

18. The display panel as claimed in

Assignees

• Shenzhen China Star Optoelect

Inventors

• Tu Aiguo

Classifications

• H01L51/0071

  Electricity · mapped topic

• H01L51/5056

  Electricity · mapped topic

• H01L51/0072

  Electricity · mapped topic

• H01L2251/558

  Electricity · mapped topic

• H01L51/005

  Electricity · mapped topic