# US 8,541,114 B2 · Light emitting device and electronic appliance using the same

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- Number: US 8,541,114 B2
- Document ID: US8541114B2
- Status: Granted
- Kind: B2
- Application number: 13/568,155
- Filed: 2012-08-07
- Published: 2012-11-29
- Granted: 2013-09-24
- Earliest claimed: 2005-06-22
- Assignees: Semiconductor Energy Laboratory Co., Ltd.
- Applicants: Yuji Iwaki; Satoshi Seo; Takahiro Kawakami; Hisao Ikeda; Junichiro Sakata; Tomoya Aoyama
- Inventors: Yuji Iwaki; Satoshi Seo; Takahiro Kawakami; Hisao Ikeda; Junichiro Sakata; Tomoya Aoyama
- Web page: https://patentgrep.com/patent/US8541114B2

## CPC

- H05B 33/22: characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
- H10K 50/17: Carrier injection layers
- H10K 50/171: {Electron injection layers}
- H10K 85/615: {Polycyclic condensed aromatic hydrocarbons, e.g. anthracene}
- H10K 50/165: comprising dopants
- H10K 85/324: {comprising aluminium, e.g. Alq3}
- H10K 85/657: {Polycyclic condensed heteroaromatic hydrocarbons}
- Y10S 428/917: Electroluminescent
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A light emitting device comprises a pair of electrodes and a mixed layer provided between the pair of electrodes. The mixed layer contains an organic compound which contains no nitrogen atoms, i.e., an organic compound which dose not have an arylamine skeleton, and a metal oxide. As the organic compound, an aromatic hydrocarbon having an anthracene skeleton is preferably used. As such an aromatic hydrocarbon, t-BuDNA, DPAnth, DPPA, DNA, DMNA, t-BuDBA, and the like are listed. As the metal oxide, molybdenum oxide, vanadium oxide, ruthenium oxide, rhenium oxide, and the like are preferably used. Further, the mixed layer preferably shows absorbance per 1 μm of 1 or less or does not show a distinct absorption peak in a spectrum of 450 to 650 nm when an absorption spectrum is measured.

## Claims

### Claim 1

A light emitting device comprising:
a first electrode;
a second electrode;
a light emitting layer between the first electrode and the second electrode; and
a mixed layer between the first electrode and the light emitting layer,
wherein the mixed layer comprises a metal oxide and a compound comprising an anthracene skeleton,
wherein the metal oxide shows an electron accepting property with respect to the compound comprising an anthracene skeleton, and
wherein a transmittance of the mixed layer with respect to light in a spectrum of 450 to 650 nm is 80% or more.

### Claim 2 (depends on 1)

A light emitting device according to claim 1, wherein a hole mobility of the compound comprising an anthracene skeleton is greater than or equal to 1×10−6 cm2/Vs.

### Claim 3 (depends on 1)

A light emitting device according to claim 1, wherein the compound comprising an anthracene skeleton has 14 to 60 carbon atoms.

### Claim 4 (depends on 1)

A light emitting device according to claim 1, wherein the compound comprising an anthracene skeleton is any one of 2-tert-butyl-9,10-di(2-naphthyl)anthracene; 9,10-di(naphthalen-1-yl)-2-tert-butyl anthracene; anthracene; 9,10-diphenylanthracene; 9,10-bis(3,5-diphenylphenyl)anthracene; 9,10-di(naphthalen -2-yl)anthracene; 2-tert-butylanthracene; 9,10-di(4-methylnaphthalen-1-yl)anthracene; 9,10-bis[2-(naphthalen-1-yOphenyl]anthracene; 2,3,6,7-tetramethyl-9,10-di(naphthalen -1-yl)anthracene; 2,3,6,7-tetramethyl-9,10-di(naphthalen-2-yl)anthracene; bianthryl; 10,10′-di(2-phenylphenyl)-9,9′-bianthryl; 10,10′-bis [(2,3,4,5,6-pentaphenyl)phenyl]-9,9′-bianthryl; and 9,10-di(4-phenylphenyl)-2-tert-butylanthracene.

### Claim 5 (depends on 1)

A light emitting device according to claim 1, wherein the first electrode is an anode.

### Claim 6 (depends on 1)

An electronic appliance comprising the light emitting device according to claim 1.

### Claim 7 (depends on 1)

A lighting device comprising the light emitting device according to claim 1.

### Claim 8 (depends on 1)

A light emitting device according to claim 1, wherein the compound comprising an anthracene skeleton does not have an arylamine skeleton.