# US 10,374,187 B2 · Organic light-emitting device and method of producing the same

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- Number: US 10,374,187 B2
- Document ID: US10374187B2
- Status: Granted
- Kind: B2
- Application number: 14/669,606
- Filed: 2015-03-26
- Published: 2015-07-16
- Granted: 2019-08-06
- Earliest claimed: 2012-05-22
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Eung-Do Kim
- Web page: https://patentgrep.com/patent/US10374187B2

## CPC

- H10K 50/166: {comprising a multilayered structure}
- H10K 50/826: Multilayers, e.g. opaque multilayers
- H10K 85/30: Coordination compounds
- H10K 85/324: {comprising aluminium, e.g. Alq3}
- H10K 85/60: Organic compounds having low molecular weight (H10K85/10 - H10K85/50 take precedence)
- H10K 85/626: {containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene}
- H10K 85/631: {Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine}
- H10K 85/633: {comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom}
- H10K 85/636: {comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom}
- H10K 85/654: {comprising only nitrogen as heteroatom (H10K85/652 takes precedence)}
- H10K 85/6565: {Oxadiazole compounds}
- H10K 85/6572: {comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole}
- H10K 2102/00: Constructional details relating to the organic devices covered by this subclass
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An organic light-emitting device and a method of producing the same, the device including a substrate; a first electrode layer on the substrate; an emission layer on the first electrode layer; an electron transport layer on the emission layer, the electron transport layer including first electron transport layers and a second electron transport layer between the first electron transport layers and the second electron transport layer including a lanthanide metal; and a second electrode layer on the electron transport layer.

## Claims

### Claim 1

An organic light-emitting device, comprising:
a substrate;
a first electrode layer on the substrate;
an emission layer on the first electrode layer;
an electron transport layer on the emission layer, the electron transport layer including first electron transport layers and at least one second electron transport layer, wherein the at least one second electron transport layer:
is between the first electron transport layers,
has a thickness of about 5 Å to about 15 Å, and
includes a lanthanide metal;
a second electrode layer on the electron transport layer; and
an electron injection layer between the electron transport layer and the second electrode layer, wherein the electron injection layer includes a carboxylate compound of an alkali metal, an acetate compound of an alkali metal, an azide compound of an alkali metal, or a carboxide of an alkali metal.

### Claim 2 (depends on 1)

The organic light-emitting device of claim 1, wherein the second electrode layer includes an Ag-rich alloy containing a dominant amount of Ag.

### Claim 3 (depends on 1)

The organic light-emitting device of claim 1, wherein the second electrode layer includes an alloy of Mg and Ag.

### Claim 4 (depends on 3)

The organic light-emitting device of claim 3, wherein a volume ratio of Mg to Ag in the second electrode layer is about 1:5 to about 1:10.

### Claim 5 (depends on 1)

The organic light-emitting device of claim 1, wherein the at least one second electron transport layer includes ytterbium or samarium.

### Claim 6 (depends on 1)

The organic light-emitting device of claim 1, wherein the electron transport layer includes two or more layers of the second electron transport layer.

### Claim 7 (depends on 1)

The organic light-emitting device of claim 1, wherein the first electron transport layers each include Alq3, 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), 4,7-diphenyl-1,10-phenanthroline (Bphen), 3-(4-biphenylyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole (TAZ), 4-(naphthalen-1-yl)-3,5-diphenyl-4H-1,2,4-triazole (NTAZ), 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (tBu-PBD), (bis(2-methyl-8-quinolinolato-N 1,O8)-(1,1′-biphenyl-4-olato)aluminum (BAlq), beryllium bis(benzoquinolin-10-olate (Bebq2), or 9,10-di(naphthalene-2-yl)anthracene (ADN).

### Claim 8 (depends on 1)

The organic light-emitting device of claim 1, wherein the first electron transport layers each have a thickness of about 150 Å to about 500 Å.

### Claim 9 (depends on 1)

The organic light-emitting device of claim 1, wherein the first electron transport layers each further include a lithium complex.

### Claim 10 (depends on 1)

The organic light-emitting device of claim 1, further comprising at least one of a hole transport layer or a hole injection layer between the first electrode layer and the emission layer.

### Claim 11 (depends on 10)

The organic light-emitting device of claim 10, wherein the hole transport layer or the hole injection layer further includes a charge-generating material.

### Claim 12 (depends on 11)

The organic light-emitting device of claim 11, wherein the charge-generating material is a p-type dopant.

### Claim 13 (depends on 1)

The organic light-emitting device of claim 1, further comprising a hole injection transport layer between the first electrode layer and the emission layer, the hole injection transport layer having both hole injecting and transporting capabilities.

### Claim 14 (depends on 1)

The organic light-emitting device of claim 1, wherein:
the first electrode layer is an anode, and
the second electrode layer is a cathode.

### Claim 15

A method of producing an organic light-emitting device, the method comprising:
providing a substrate;
providing a first electrode layer on the substrate;
forming a hole injection layer or a hole transport layer on the first electrode layer;
forming an emission layer on the hole injection layer or the hole transport layer;
forming an electron transport layer on the emission layer such that the electron transport layer includes first electron transport layers and at least one second electron transport layer, wherein the at least one second electron transport layer:
is between the first electron transport layers,
has a thickness of about 5 Å to about 15 Å, and
includes a lanthanide metal;
forming an electron injection layer on the electron transport layer; and
forming a second electrode layer on the electron injection layer, wherein the electron injection layer includes a carboxylate compound of an alkali metal, an acetate compound of an alkali metal, an azide compound of an alkali metal, or a carboxide of an alkali metal.

### Claim 16 (depends on 15)

The method of claim 15, wherein the second electrode layer includes an Ag-rich alloy containing a dominant amount of Ag.

### Claim 17 (depends on 15)

The method of claim 15, wherein the at least one second electron transport layer includes ytterbium or samarium.