# US 5,702,833 A · Organic electroluminescent element

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,702,833 A
- Document ID: US5702833A
- Status: Granted
- Kind: A
- Application number: 08/515,006
- Filed: 1995-08-14
- Granted: 1997-12-30
- Earliest claimed: 1995-03-08
- Assignees: Ricoh Company, Ltd.
- Inventors: Kazukiyo Nagai; Chihaya Adachi; Nozomu Tamoto; Yohta Sakon
- Web page: https://patentgrep.com/patent/US5702833A

## CPC

- H10K 50/11: characterised by the electroluminescent [EL] layers
- H05B 33/14: characterised by the chemical or physical composition or the arrangement of the electroluminescent material {, or by the simultaneous addition of the electroluminescent material in or onto the light source}
- Y10S 428/917: Electroluminescent
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

An organic electroluminescent element having an anode, a cathode, and an organic compound layer provided between the electrodes, the organic compound layer containing an oxadiazole compound of formula (I) or (II): ##STR1## wherein A.sup.1 to A.sup.6 are each an aromatic hydrocarbon group or an aromatic heterocyclic group which may have a substituent; X is a hydrogen atom or a fluorine atom; R.sup.1 and R.sup.2 are each a hydrogen atom, a halogen atom, or an alkyl group which may have a substituent, or an alkoxyl group which may have a substituent; and R.sup.3, R.sup.4 and R.sup.5 are each a hydrogen atom, a halogen atom, an alkyl group which may have a substituent, an alkoxyl group which may have a substituent, or hydroxyl group.

## Claims

### Claim 1

An organic electroluminescent element comprising an anode, a cathode, and an organic compound layer provided between said anode and said cathode, said organic compound layer comprising an oxadiazole compound of formula (I) in an election-transporting effective amount: ##STR93## wherein A.sup.1 to A.sup.4 are each independently an aromatic hydrocarbon group which may have a substituent, or an aromatic heterocyclic group which may have a substituent; X is a hydrogen atom or a fluorine atom; and R.sup.1 and R.sup.2 are each independently a hydrogen atom, a halogen atom, or an alkyl group having 1 to 12 carbon atoms which may have a substituent, or an alkoxyl group having 1 to 12 carbon atoms which may have a substituent.

### Claim 2 (depends on 1)

The organic electroluminescent element as claimed in claim 1, wherein X in formula (I) represents a fluorine atom.

### Claim 3 (depends on 1)

The organic electroluminescent element as claimed in claim 1, wherein said organic compound layer comprises a plurality of overlaid layers which layers comprise a luminescent layer and at least one electron-transporting layer comprising said oxadiazole compound of formula (I), which electron-transporting layer is provided between said luminescent layer and said cathode.

### Claim 4 (depends on 1)

The organic electroluminescent element as claimed in claim 1, wherein said organic compound layer comprises an oxadiazole compound of formula (I)-1: ##STR94## wherein A.sup.1 to A.sup.4 are each independently an aromatic hydrocarbon group which may have a substituent, or an aromatic heterocyclic group which may have a substituent; X is a hydrogen atom or a fluorine atom; and R.sup.1 and R.sup.2 are each independently a hydrogen atom, a halogen atom, or an alkyl group having 1 to 12 carbon atoms which may have a substituent, or an alkoxyl group having 1 to 12 carbon atoms which may have a substituent.