Organic light emitting diode

• US 9,691,991 B2
• Filed: 02/27/2013
• Issued: 06/27/2017
• Est. Priority Date: 02/27/2012
• Status: Active Grant

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Kim, Yun Hwan, Hong, Sung Kil, Kim, Kongkyeom, Chun, Minseung, Jang, Jungi
• Primary Examiner(s): Garrett, Dawn
• Application Number:
  US14/241,682
• Publication Number:
  US 20140203272A1
• Time in Patent Office: 1,581 Days
• CPC Class Codes: H10K 50/16 Electron transporting layers
• CPC Class Codes: H10K 50/18 Carrier blocking layers
• CPC Class Codes: H10K 50/181 Electron blocking layers
• CPC Class Codes: H10K 77/10 Substrates, e.g. flexible substrates
• 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 85/626 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
• CPC Class Codes: H10K 85/636 comprising heteroaromatic 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 85/6572 comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
• CPC Class Codes: H10K 85/6574 comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes
• CPC Class Codes: H10K 85/6576 comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene
• CPC Class Codes: Y02E 10/549 Organic PV cells

Abstract

The present invention relates to an organic light emitting diode and a method of manufacturing the same. An organic light emitting diode according to the present invention comprises an exciton blocking layer comprising a compound represented by Formula 1 to confine an exciton to a light emitting layer to prevent light emitting leakage, and thus there is an effect of implementing an organic electroluminescence diode having excellent light emitting efficiency. Further, even though there is no separate electron injection layer, electron injection and light transport characteristics are excellent by comprising an electron transport layer comprising a compound represented by Formula 2 or 3, and thus it is possible to implement an organic light emitting diode having a simple and economical manufacturing process, a low voltage, high efficiency, and a long life span as compared to the related art.

Claims

1. An organic light emitting diode comprising an anode, a cathode, and one or more organic material layers interposed between the anode and the cathode, wherein:

a first organic material layer is a light emitting layer,

a second organic layer is an electron blocking layer interposed between the anode and the light emitting layer, the electron blocking layer comprising a compound represented by following Formula 1,

a third organic material layer comprising a compound represented by the following Formula 2 or 3 is interposed between the cathode and the light emitting layer, and

a fourth organic material layer is a hole transport layer interposed between the anode and the electron blocking layer;

2. The organic light emitting diode of claim 1, wherein the electron blocking layer is in contact with the light emitting layer.

3. The organic light emitting diode of claim 1, wherein the third organic material layer is an electron transport layer.

4. The organic light emitting diode of claim 1, wherein the third organic material layer is an electron transport layer and a fifth organic material layer is an electron injection layer interposed between the cathode and the light emitting layer.

5. The organic light emitting diode of claim 1, wherein both CY1 and CY2 of Formula 1 are a benzene cycle, Ar3 is hydrogen or a phenyl group, and Ar4 is a phenyl group or a biphenyl group.

6. The organic light emitting diode of claim 1, wherein both CY1 and CY2 of Formula 1 are a benzene cycle, and L is a divalent biphenyl group.

7. The organic light emitting diode of claim 1, wherein the compound represented by Formula 1 is represented by any one of the following Formulas 4 to 6:

8. The organic light emitting diode of claim 1, wherein the compound represented by Formula 1 is selected from the group consisting of the following Structural Formulas:

9. The organic light emitting diode of claim 1, wherein the compound represented by Formula 2 or 3 is selected from the group consisting of the following Structural Formulas: