Organic light-emitting device having low work function metal halide compound in hole injection layer

Patent metadata

Field	Value
Publication number	US-10170722-B2
Application number	US-201514633365-A
Country	US
Kind code	B2
Filing date	Feb 27, 2015
Priority date	Sep 16, 2014
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

Provided is an organic light-emitting device including a first electrode; a second electrode facing the first electrode; and an organic layer between the first electrode and the second electrode and including an emission layer, the organic layer including a low work function metal compound.

First claim

What is claimed is:

1. An organic light-emitting device, comprising:
a first electrode;
a second electrode facing the first electrode; and
an organic layer between the first electrode and the second electrode and including an emission layer, the organic layer including a hole injection layer that is in direct contact with the first electrode and consists of a metal compound having a work function in a range of more than 0 eV to 3 eV.

2. The organic light-emitting device as claimed in claim 1 , wherein the metal compound includes a halide of an alkali metal.

3. The organic light-emitting device as claimed in claim 1 , wherein the metal compound includes a halide of an alkaline earth metal.

4. The organic light-emitting device as claimed in claim 1 , wherein the metal compound includes a halide of a lanthanide metal.

5. The organic light-emitting device as claimed in claim 1 , wherein the metal compound includes a halide of Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, Yb, or Sm.

6. The organic light-emitting device as claimed in claim 1 , wherein the metal compound includes LiF, NaF, KF, RbF, CsF, BeF 2 , MgF 2 , CaF 2 , SrF 2 , BaF 2 , YbF, YbF 2 , YbF 3 , or SmF 3 .

7. The organic light-emitting device as claimed in claim 1 , wherein the metal compound is in a layer having a thickness of 1 Å to 30 Å.

8. The organic light-emitting device as claimed in claim 1 , wherein the metal compound is in a layer that consists of the metal compound and a hole injection material.

9. The organic light-emitting device as claimed in claim 8 , wherein the metal compound is in a layer having a thickness of 1 Å to 100 Å.

10. An organic light-emitting device, comprising:
a first electrode;
a second electrode facing the first electrode; and
an organic layer between the first electrode and the second electrode and including an emission layer, the organic layer including an electron injection layer and a hole injection layer, the hole injection layer including a metal compound, the metal compound having a work function in a range of more than 0 eV to 3 eV and including a halide of a lanthanide metal, wherein:
the first electrode is an anode,
the second electrode is a cathode, and
the organic layer includes:
a hole transport region between the first electrode and the emission layer, the hole transport region including the hole injection layer and optionally one or more of a hole transport layer or an electron blocking layer, and
an electron transport region between the emission layer and the second electrode, the electron transport region including the electron injection layer, and optionally one or more of a hole blocking layer or an electron transport layer, and

the hole injection layer including the metal compound directly contacts the anode.

11. The organic light-emitting device as claimed in claim 10 , wherein the hole injection layer consists of the metal compound.

12. The organic light-emitting device as claimed in claim 10 , wherein the hole injection layer consists of the metal compound and a hole injection material.

13. An organic light-emitting device, comprising:
an anode;
a cathode facing the anode; and
an organic layer between the anode and the cathode and including an emission layer, the organic layer including:
a hole transport region between the anode and the emission layer, the hole transport region including a hole injection layer, and
an electron transport region between the emission layer and the cathode, the electron transport region including an electron injection layer,

wherein:
the hole injection layer includes
LiCl, NaCl, KCl, RbCl, CsCl, BeCl 2 , MgCl 2 , CaCl 2 , SrCl 2 , BaCl 2 , YbCl, YbCl 2 , YbCl 3 , SmCl 3 ,
LiBr, NaBr, KBr, RbBr, CsBr, BeBr 2 , MgBr 2 , CaBr 2 , SrBr 2 , BaBr 2 , YbBr, YbBr 2 , YbBr 3 , SmBr 3 ,
LiI, NaI, KI, RbI, CsI, BeI 2 , MgI 2 , CaI 2 , SrI 2 , BaI 2 , YbI, YbI 2 , YbI 3 , or SmI 3 , and

the hole injection layer directly contacts the anode.

14. The organic light-emitting device as claimed in claim 13 , wherein the hole injection layer includes NaBr, KBr, RbBr, CsBr, BeBr 2 , SrBr 2 , or BaBr 2 .

15. The organic light-emitting device as claimed in claim 13 , wherein the hole injection layer includes NaI, KI, RbI, CsI, BeI 2 , SrI 2 , or BaI 2 .

16. The organic light-emitting device as claimed in claim 13 , wherein the hole injection layer includes:
NaI, RbI, BeI 2 , SrI 2 , or BaI 2 .

17. A display apparatus, comprising an organic light-emitting device, wherein the organic light-emitting device includes:
a first electrode;
a second electrode facing the first electrode; and
an organic layer between the first electrode and the second electrode and including an emission layer, the organic layer including an electron injection layer and a hole injection layer, the hole injection layer including a metal compound, the metal compound having a work function in a range of more than 0 eV to 3 eV and including a halide of a lanthanide metal, wherein:
the first electrode is an anode,
the second electrode is a cathode, and
the organic layer includes:
a hole transport region between the first electrode and the emission layer, the hole transport region including the hole injection layer and optionally one or more of a hole transport layer or an electron blocking layer, and
an electron transport region between the emission layer and the second electrode, the electron transport region including the electron injection layer, and optionally one or more of a hole blocking layer or an electron transport layer, and

the hole injection layer including the metal compound directly contacts the anode,
wherein the first electrode of the organic light-emitting device is electrically connected to a source or drain electrode of a thin film transistor.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Eungdo
• Kim Dongchan
• Kim Wonjong
• Seo Dongkyu
• Im Dahea
• Yim Sanghoon
• Cho Yoonhyeung
• Chu Changwoong

Classifications

• H01L51/006

  Electricity · mapped topic

• H01L51/0067

  Electricity · mapped topic

• H01L51/5088 Primary

  Electricity · mapped topic

• H01L51/0087

  Electricity · mapped topic

• H01L51/0085

  Electricity · mapped topic