Organic electroluminescence device having RGB pixel areas

• US 10,693,107 B2
• Filed: 12/29/2015
• Issued: 06/23/2020
• Est. Priority Date: 12/31/2014
• Status: Active Grant

• Current Assignee: Kunshan New Flat Panel Display Technology Center Co. Ltd., Beijing Visionox Technology Co., Ltd. (Visionox Technology, Inc.), Kunshan Govisionox Optoelectronics Co., Ltd (Visionox Technology, Inc.)
• Original Assignee: Beijing Visionox Technology Co., Ltd. (Visionox Technology, Inc.)
• Inventors: Liu, Song, Li, Weiwei, He, Lin
• Primary Examiner(s): Garrett, Dawn L
• Application Number:
  US15/540,240
• Publication Number:
  US 20170373276A1
• Time in Patent Office: 1,638 Days
• CPC Class Codes: C07C 211/54 having amino groups bound to two or three six-membered aromatic rings
• CPC Class Codes: C07C 211/58 Naphthylamines; N-substituted derivatives thereof
• CPC Class Codes: C07C 211/61 with at least one of the condensed ring systems formed by three or more rings
• CPC Class Codes: C07D 487/04 Ortho-condensed systems
• CPC Class Codes: H10K 2101/30 Highest occupied molecular orbital [HOMO], lowest unoccupied molecular orbital [LUMO] or Fermi energy values
• CPC Class Codes: H10K 2101/40 Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
• CPC Class Codes: H10K 30/865 Intermediate layers comprising a mixture of materials of the adjoining active layers
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/15 Hole transporting layers
• CPC Class Codes: H10K 50/155 comprising dopants
• CPC Class Codes: H10K 50/156 comprising a multilayered structure
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/875 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 85/615 Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
• CPC Class Codes: H10K 85/622 containing four rings, e.g. pyrene
• CPC Class Codes: H10K 85/623 containing five rings, e.g. pentacene
• CPC Class Codes: H10K 85/626 containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
• CPC Class Codes: H10K 85/631 Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
• CPC Class Codes: H10K 85/633 : comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
• CPC Class Codes: H10K 85/654 : comprising only nitrogen as heteroatom H10K85/652 takes precedence
• CPC Class Codes: H10K 85/657 : Polycyclic condensed heteroaromatic hydrocarbons
• CPC Class Codes: H10K 85/6572 : comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole

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.

Claims

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);

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);

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):