Organic electroluminescence device having RGB pixel areas

Patent metadata

Field	Value
Publication number	US-10693107-B2
Application number	US-201515540240-A
Country	US
Kind code	B2
Filing date	Dec 29, 2015
Priority date	Dec 31, 2014
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

An organic electroluminescence device having RGB pixel areas, wherein optical compensation layers are respectively arranged between the red light emitting layer and the first organic functional layer as well as between the green light emitting layer and the first organic functional layer, the optical compensation layers are made of a first hole transport material and a second hole transport material, the first hole transport material has a triplet-state energy level ≥2.48 eV and a HOMO energy level ≤−5.5 eV, the second hole transport material has a HOMO energy level >−5.5 eV, and the difference between the HOMO energy level of the first hole transport material and the HOMO energy level of the second hole transport material is ≤0.2 eV. Its preparation process is simple, and it can significantly reduce power consumption of the light-emitting device so as to increase light-emitting efficiency.

First claim

The invention claimed is:

1. An organic electroluminescence device having RGB pixel areas, comprising a substrate, with a first electrode layer, a plurality of organic layers and a second electrode layer formed in sequence on the substrate, wherein, the organic layers include a first organic functional layer, a light emitting layer and a second organic functional layer arranged upon the first electrode layer, the light emitting layer comprises a red light emitting layer, a green light emitting layer and a blue light emitting layer,
wherein,
the organic electroluminescence device further comprises optical compensation layers including a red light optical compensation layer arranged between the red light emitting layer and the first organic functional layer as well as a green light optical compensation layer arranged between the green light emitting layer and the first organic functional layer, the optical compensation layers are made of a first hole transport material and a second hole transport material, the first hole transport material has a triplet-state energy level ≥2.48 eV and a HOMO energy level ≤−5.5 eV, the second hole transport material has a HOMO energy level >−5.5 eV, and the difference between the HOMO energy level of the first hole transport material and the HOMO energy level of the second hole transport material is ≤0.2 eV;
wherein a total thickness of the red light optical compensation layer plus the red light emitting layer, a total thickness of the green light optical compensation layer plus the green light emitting layer, and a thickness of the blue light emitting layer are substantially equal;
wherein top surfaces of the red light emitting layer, the green light emitting layer and the blue light emitting layer are substantially coplanar.

2. The organic electroluminescence device having RGB pixel areas of claim 1 , wherein, the first hole transport material and second hole transport material contained in the red light optical compensation layer has a mass ratio of 1:99 to 99:1.

3. The organic electroluminescence device having RGB pixel areas of claim 1 , wherein, the first hole transport material and second hole transport material contained in the green light optical compensation layer has a mass ratio of 5:95 to 50:50.

4. The organic electroluminescence device having RGB pixel areas of claim 3 , wherein, the first hole transport material and second hole transport material contained in the green light optical compensation layer has a mass ratio of 10:90 to 30:70.

5. An organic electroluminescence device having RGB pixel areas, comprising a substrate, with a first electrode layer, a plurality of organic layers and a second electrode layer formed in sequence on the substrate, wherein, the organic layers include a first organic functional layer, a light emitting layer and a second organic functional layer arranged upon the first electrode layer, the light emitting layer comprises a red light emitting layer, a green light emitting layer and a blue light emitting layer,
wherein,
the organic electroluminescence device further comprises optical compensation layers including a red light optical compensation layer arranged between the red light emitting layer and the first organic functional layer as well as a green light optical compensation layer arranged between the green light emitting layer and the first organic functional layer, the optical compensation layers are made of a first hole transport material and a second hole transport material, the first hole transport material has a triplet-state energy level ≥2.48 eV and a HOMO energy level ≤−5.5 eV, the second hole transport material has a HOMO energy level >−5.5 eV, and the difference between the HOMO energy level of the first hole transport material and the HOMO energy level of the second hole transport material is ≤0.2 eV;
wherein a total thickness of the red light optical compensation layer plus the red light emitting layer, a total thickness of the green light optical compensation layer plus the green light emitting layer, and a thickness of the blue light emitting layer are substantially equal;
wherein top surfaces of the red light emitting layer, the green light emitting layer and the blue light emitting layer are substantially coplanar;
wherein, the first hole transport material has a structure defined by the following structural formula (2):

in the structural formula (2), the groups of A1 and A2 are individually selected from C 6 -C 30 aryl group or C 6 -C 30 heterocyclic aryl group, the group R1′ is selected from hydrogen, alkyl group, alkoxyl group or basic group;
and the structural formula (2) also meets the following condition: at least one of the groups of A1 and A2 has a condensed ring structure.

6. The organic electroluminescence device having RGB pixel areas of claim 5 , wherein, the first hole transport material has a structure selected from the following structural formulas (HTL1-6), (HTL1-7), and (HTL1-9):

7. An organic electroluminescence device having RGB pixel areas, comprising a substrate, with a first electrode layer, a plurality of organic layers and a second electrode layer formed in sequence on the substrate, wherein, the organic layers include a first organic functional layer, a light emitting layer and a second organic functional layer arranged upon the first electrode layer, the light emitting layer comprises a red light emitting layer, a green light emitting layer and a blue light emitting layer,
wherein,
the organic electroluminescence device further comprises optical compensation layers including a red light optical compensation layer arranged between the red light emitting layer and the first organic functional layer as well as a green light optical compensation layer arranged between the green light emitting layer and the first organic functional layer, the optical compensation layers are made of a first hole transport material and a second hole transport material, the first hole transport material has a triplet-state energy level ≥2.48 eV and a HOMO energy level ≤−5.5 eV, the second hole transport material has a HOMO energy level >−5.5 eV, and the difference between the HOMO energy level of the first hole transport material and the HOMO energy level of the second hole transport material is ≤0.2 eV;
wherein a total thickness of the red light optical compensation layer plus the red light emitting layer, a total thickness of the green light optical compensation layer plus the green light emitting layer, and a thickness of the blue light emitting layer are substantially equal;
wherein top surfaces of the red light emitting layer, the green light emitting layer and the blue light emitting layer are substantially coplanar;
wherein, the second hole transport material has a structure defined by the following structural formula (5):

wherein, the groups of A and B are individually selected from phenyl group, naphthyl group or phenyl-amino group;
the groups of R 9 , R 10 , R 11 and R 12 are identical or different, and are individually selected from C 6 -C 30 aryl group.

8. The organic electroluminescence device having RGB pixel areas of claim 7 , wherein, the second hole transport material has a structure selected from the following structural formulas (HTL2-14) to (HTL2-18):

Assignees

• Beijing Visionox Technology Co
• Kunshan New Flat Panel Display Technology Ct Co Ltd
• Kunshan Govisionox Optoelectronics Co Ltd

Inventors

• Liu Song
• Li Weiwei
• He Lin

Classifications

• C07D487/04 Primary

  Ortho-condensed systems · CPC title

• H10K59/875 Primary

  Arrangements for extracting light from the devices · CPC title

• H10K50/85

  Arrangements for extracting light from the devices · CPC title

• H10K2101/40

  Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers · CPC title

• H10K50/155

  comprising dopants · CPC title