US5256945A
Expired / Lapsed
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Organic electroluminescence element
Assignee: Pioneer Corp
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Filing: 1991-12-13
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Granted: 1993-10-26
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Expires: 2011-12-13
Abstract
Abstract An organic EL element comprises a cathode, an EL layer of organic compound, a first hole transport layer of organic compound, a second hole transport layer of organic compound and an anode which are laminated in sequence, wherein the second hole transport layer is made of a substance represented by the following chemical formula 1: ##STR1## where R each independently represents a hydrogen atom, an alkyl group of from 1 to 6 carbon atoms, a halogen group, a cyano group, a nitro group, a primary, secondary or tertiary amino group, or an aryl group of from 6 to 15 carbon atoms. This organic EL element prevents a leakage current and emits light stably for a long time.
Inventors
- 👤 Kunio Imai
- 👤 Masanao Shinkai
- 👤 Takeo Wakimoto
- 👤 Yasuhiko Shirota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:21
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; C; C07; C07C; C07C211/00; C07C211/43; C07C211/54; H01; H01B; H01B1/00; H01B1/06; H01B1/12; H10; H10K; H10K50/00; H10K50/10; H10K50/11; H10K85/00; H10K85/60; H10K85/631; H10K2102/00; H10K2102/10; H10K2102/101; H10K2102/103; H10K85/10; H10K85/141; H10K85/146; H10K85/30; H10K85/311; H10K85/321; H10K85/324; H10K85/649; H10K85/656; H10K85/6565; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
101 words
An organic electroluminescence element, comprising a cathode, an EL layer of organic compound, a first hole transport layer of organic compound, a second hole transport layer of organic compound and an anode which are laminated in sequence, wherein the second hole transport layer is made of a substance represented by the following chemical formula 1: ##STR8## where R each independently represents a hydrogen atom, an alkyl group of from 1 to 6 carbon atoms, a halogen group, a cyano group, a nitro group, a primary, secondary or tertiary amino group, or an aryl group of from 6 to 15 carbon atoms.
Claim 2
Dependent Claim
101 words
An organic electroluminescence element, comprising a cathode, an EL layer of organic compound, a first hole transport layer of organic compound, a second hole transport layer of organic compound and an anode which are laminated in sequence, wherein the second hole transport layer is made of a substance represented by the following chemical formula 1: ##STR8## where R each independently represents a hydrogen atom, an alkyl group of from 1 to 6 carbon atoms, a halogen group, a cyano group, a nitro group, a primary, secondary or tertiary amino group, or an aryl group of from 6 to 15 carbon atoms.
Claim 3
Dependent Claim
23 words
An organic electroluminescence element according to claim 1, wherein an organic electron transport layer is provided between said cathode and said EL layer.
Claim 4
Dependent Claim
18 words
An organic electroluminescence element according to claim 1, wherein the second hole transport layer is made of 4,4'4"-tris[N-(3-methylphenyl)-N-phenylamino]triphenylamine.
Claim 5
Dependent Claim
18 words
An organic electroluminescence element according to claim 1, wherein the second hole transport layer is made of 4,4',4"-tris(N,N-diphenylamino)-triphenylamine.
Claim 6
Dependent Claim
18 words
An organic electroluminescence element according to claim 1, wherein the first hole transport layer is made of (N,N'-diphenyl)-N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine.
Claim 7
Dependent Claim
17 words
An organic electroluminescence element according to claim 5, wherein the electron transport layer is made of 2-(4'-tert-butylphenyl)-5-(biphenyl)-1,3,4-oxadiazole.
Claim 8
Dependent Claim
22 words
An organic electroluminescence element according to claim 1, wherein the EL layer is made of one of aluminum oxine chelate and tetraphenylbutadiene.
Claim 9
Dependent Claim
18 words
An organic electroluminescence element according to claim 2, wherein the second hole transport layer is made of 4,4',4"-tris[N-(3-methylphenyl)-N-phenylamino]triphenylamine.
Claim 10
Dependent Claim
18 words
An organic electroluminescence element according to claim 2, wherein the second hole transport layer is made of 4,4',4"-tris(N,N-diphenylamino)-triphenylamine.
Claim 11
Dependent Claim
18 words
An organic electroluminescence element according to claim 2, wherein the first hole transport layer is made of (N,N'-diphenyl)-N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine.
Claim 12
Dependent Claim
17 words
An organic electroluminescence element according to claim 10, wherein the electron transport layer is made of 2-(4'-tert-butylphenyl)-5-(biphenyl)-1,3,4-oxadiazole.
Claim 13
Dependent Claim
22 words
An organic electroluminescence element according to claim 2, wherein the EL layer is made of one of aluminum oxine chelate and tetraphenylbutadiene.
References Cited (Backward Citations)
US4720432A
Cited
US5104740A
Cited
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