Electroluminescent device

Claim 2

An electroluminescent device comprising a luminescent layer and a pair of electrodes, wherein said luminescent layer comprises a mixed Langmuir-Blodgett monomolecular film, or built-up film thereof, comprising at least one electroluminescent organic compound and at least one organic compound, said organic compound having an electronegativity different from said electroluminescent organic compound.

Claim 3

An electroluminescent device according to claim 1, wherein at least one of the electrodes is transparent.

Claim 4

An electroluminescent device according to claim 1, wherein said electroluminescent organic compound is represented by the formula: [(X-R.sub.1).sub.m Z].sub.n -φ-R.sub.2 wherein X and R 2 each represent hydrogen, halogen, an alkoxy group, an alkyl ether group, a nitro group; a carboxyl group, a sulfonic acid group, a phosphoric acid group, a silicic acid group, a primary to tertiary amino group, and a metal salt thereof, a primary to tertiary amine salt thereof or an acid salt thereof; an ester group, a sulfamide group, an amide group, an imino group, a quaternary amino group and a salt thereof, a hydroxyl group; R 1 represents a C 4 -C 30 alkyl group; m is 1 or 2; n is an integer of 1 to 4; Z is direct bonding or --O--, --S--, NR 3 --, --CH 2 NR 3 --, --SO 2 NR 3 --, --CO--, --COO-- (R 3 is hydrogen, an alkyl group or an aryl group); and φ is a fused polycyclic aromatic hydrocarbon, p-terphenyl, 2,5-diphenyloxazole, 1,4-bis(2-methylstyryl)-benzene, xanthine, coumarine, acridine, cyanine dye, benzophenone, phthalocyanine and a metal complex thereof, porphyrin and a metal complex thereof, 8-hydroxyquinoline and a metal complex thereof, an organic ruthenium complex, an organic rare earth complex, and a derivative of these compounds, a heterocyclic compound and a derivative thereof, an aromatic polyamine, a compound having quinone structure, tetracyanoquinodimethane and tetracyanoethylene.

Claim 5

An electroluminescent device according to claim 1, wherein said electroluminescent organic compound and the organic compound different in electronegativity therefrom are mixed at a molar ratio of 10/1 to 1/10.

Claim 6

An electroluminescent device according to claim 1, wherein said luminescent layer has a thickness of 0.01 to 1 μm.

Claim 7

An electroluminescent device comprising a luminscent layer of double-layer structure and a pair of electrodes, wherein a first layer of the luminescent layer comprises a mixed Langmuir-Blodgett monomolecular film, or built-up film thereof, comprising a first eletroluminescent organic compound and a first organic compound and a second layer of the luminescent layer comprises a mixed Langmuir-Blodgett monomolecular film, or a built-up film thereof, comprising a second electroluminscent organic compound and a second organic compound; said first electroluminescent organic compound being electron-acceptable relative to said second layer; said first organic compound being electron-acceptable relative to said first electroluminscent organic compound; said second electroluminscent organic compound being electron-donative relative to said first layer; and said second organic compound being electron-donative relative to said second electroluminescent organic compound.

Claim 8

An electroluminescent device comprising a luminscent layer of double-layer structure and a pair of electrodes, wherein a first layer of the luminescent layer comprises a mixed Langmuir-Blodgett monomolecular film, or built-up film thereof, comprising a first eletroluminescent organic compound and a first organic compound and a second layer of the luminescent layer comprises a mixed Langmuir-Blodgett monomolecular film, or a built-up film thereof, comprising a second electroluminscent organic compound and a second organic compound; said first electroluminescent organic compound being electron-acceptable relative to said second layer; said first organic compound being electron-acceptable relative to said first electroluminscent organic compound; said second electroluminscent organic compound being electron-donative relative to said first layer; and said second organic compound being electron-donative relative to said second electroluminescent organic compound.

Claim 9

An electroluminscent device according to claim 6, wherein said electrode pair consists of a transparent electrode and a back electrode, and the first layer of the luminescent layer is faced to the transparent electrode.

Claim 10

An electroluminescent device according to claim 6, wherein said first or second electroluminescent organic compuond is represented by the formula: [(X--R.sub.1).sub.m Z].sub.n --φ--R.sub.2 wherein X and R 2 each represent hydrogen, halogen, an alkoxy group, a alkyl ether group, a nitro group; a carboxyl group, a sulfonic acid group, a phosphoric acid group, a silicic acid group, a primary to tertiary amino group, and a metal salt thereof, a primary to tertiary amine salt or an acid salt thereof; an ester group, a sulfamide group, an amide group, an imino group, a quaternary amino group and a salt thereof, a hydroxyl group; R 1 represents a C 4 -C 30 alkyl group; m is 1 or 2; n is an integer of 1 to 4; Z is direct bonding or --O--, --S--, --NR 3 --, --CH 2 NR 3 --, --SO 2 NR 3 --, --CO--, --COO-- (R 3 is hydrogen, an alkyl group or an aryl group); and φ is a fused polycyclic aromatic hydrocarbon, p-terphenyl, 2,5-diphenyloxazole, 1,4-bis(2-methylstyryl)-benzene, xanthine, coumarine, acridine, cyanine dye, benzophenone, phthalocyanine and metal complex thereof, porphyrin and a metal complex thereof, 8-hydroxyquinoline and a metal complex thereof, an organic ruthenium complex, an organic rare earth complex and a derivative of these compounds, a heterocyclic compound and a derivative thereof, aromatic polyamine, a compound having quinone structure, tetracyanoquinodimethane and tetracyanoethylene.

Claim 11

An electroluminescent device according to claim 6, wherein the first electroluminescent organic compound and the first organic compound in the first layer of the luminescent layer are mixed at a molar ratio of 10/1 to 100/1.

Claim 12

An electroluminescent device according to claim 6, wherein the second electroluminescent organic compound and the second organic compound in the second layer of the luminescent layer are mixed at a molar ratio of 10/1 to 100/1.

Claim 13

An electroluminescent device according to claim 6, wherein said luminescent layer has a thickness of 0.01 to 1 μm.

Claim 14

An electroluminescent device according to claim 6, wherein said luminescent layer comprises 4 to 400 built-up monomolecular films.

Claim 15

An electroluminescent device comprising a luminescent layer of a double-layer structure and a pair of electrodes, wherein a first layer of the luminescent layer comprises a mixed Langmuir-Blodgett monomolecular film, or built-up film thereof, comprising a first electroluminescent organic compound and a first organic compound, and a second layer of the luminescent layer comprises a mixed deposited film comprising a second electroluminescent organic compound and a second organic compound; said first electroluminescent organic compound being electron-acceptable relative to said second layer; said first organic compound being electron-acceptable relative to said first electroluminescent organic compound; said second electroluminescent organic compound being electron-donative relative to said first layer; and said second organic compound being electron-donative relative to said second electroluminescent organic compound.

Claim 16

An electroluminescent device comprising a luminescent layer of a double-layer structure and a pair of electrodes, wherein a first layer of the luminescent layer comprises a mixed Langmuir-Blodgett monomolecular film, or built-up film thereof, comprising a first electroluminescent organic compound and a first organic compound, and a second layer of the luminescent layer comprises a mixed deposited film comprising a second electroluminescent organic compound and a second organic compound; said first electroluminescent organic compound being electron-acceptable relative to said second layer; said first organic compound being electron-acceptable relative to said first electroluminescent organic compound; said second electroluminescent organic compound being electron-donative relative to said first layer; and said second organic compound being electron-donative relative to said second electroluminescent organic compound.

Claim 17

An electroluminescent device according to claim 13, wherein said electrode pair consists of a transparent electrode and a back electrode, and the first layer of the luminescent layer is faced to the transparent electrode.

Claim 18

An electroluminescent device, according to claim 13, wherein said first or second electroluminescent organic compound is represented by the formula: [(X-R.sub.1).sub.m Z].sub.n --φ--R.sub.2 wherein X and R 2 each represent hydrogen, halogen, an alkoxy group, an alkyl ether group, a nitro group; a carboxyl group, a sulfonic acid group, a phosphoric acid group, a silicic acid group, a primary to tertiary amino group, and a metal salt thereof, a primary to tertiary amine salt thereof or a acid salt thereof; an ester group, a sulfamide group, an amide group, an imino group, a quaternary amino group and a salt thereof, a hydroxyl group; R 1 represents a C 4 -C 30 alkyl group; m is 1 or 2; n is an integer of 1 to 4; Z is direct bonding or --O--, --S--, --NR 3 --, --CH 2 NR 3 --, --SO 2 NR 3 --, --CO--, --COO--(R 3 is hydrogen, an alkyl group or an aryl group); and φ is a fused polycyclic aromatic hydrocarbon, p-terphenyl, 2,5-diphenyloxazole, 1,4-bis(2-methylstyryl)-benzene, xanthine, coumarine, acridine, cyanine dye, benzophenone, phthalocyanine and a metal complex thereof, a porphyrin and a metal complex thereof, 8-hydroxyquinoline and a metal complex thereof, an organic ruthenium complex, an organic rare earth complex and a derivative of these compounds, a heterocyclic compound and a derivative thereof, an aromatic polyamine, a compound having quinone structure, tetracyanoquinodimethane and tetracyanoethylene.

Claim 19

An electroluminescent device according to claim 13, wherein the first electroluminescent organic compound and the first organic compound in the first layer of the luminescent layer are mixed at a molar ratio of 10/1 to 100/1.

Claim 20

An electroluminescent device according to claim 13, wherein the second electroluminescent organic compound and the second organic compound in the second layer of the luminescent layer are mixed at a molar ratio of 10/1 to 100/1

Claim 21

An electroluminescent device according to claim 13, wherein said luminscent layer has a thickness of 0.01 to 1 μm.

Claim 22

An electroluminescent device according to claim 13, wherein said first layer comprises 4 to 400 built-up monomolecular films.

Claim 23

An electroluminescent device according to claim 13, wherein the second layer has a thickness of 0.0 to 0.5 μm.

Claim 24

An electroluminescent device comprising a luminescent layer of a double layer structure and a pair of electrodes, wherein a first layer of the luminescent layer comprises a mixed deposited film comprising a first electroluminescent organic compound and a first organic compound and a second layer of the luminescent layer comprises a mixed Langmuir-Blodgett monomolecular film, or built-up film thereof, comprising a second electroluminescent organic compound and a second organic compound; said first electroluminescent organic compound being electron-acceptable relative to said second layer; said first organic compound being electron-acceptable relative to said first electroluminescent organic compound; said second electroluminscent organic compound being electron-donative relative to said first layer; and said second organic compound being electron-donative relative to said second electroluminescent organic compound.

Claim 25

An electroluminescent device comprising a luminescent layer of a double layer structure and a pair of electrodes, wherein a first layer of the luminescent layer comprises a mixed deposited film comprising a first electroluminescent organic compound and a first organic compound and a second layer of the luminescent layer comprises a mixed Langmuir-Blodgett monomolecular film, or built-up film thereof, comprising a second electroluminescent organic compound and a second organic compound; said first electroluminescent organic compound being electron-acceptable relative to said second layer; said first organic compound being electron-acceptable relative to said first electroluminescent organic compound; said second electroluminscent organic compound being electron-donative relative to said first layer; and said second organic compound being electron-donative relative to said second electroluminescent organic compound.

Claim 26

An electroluminescent device according to claim 21, wherein said pair of electrodes consist of a transparent electrode and a back electrode, and the first layer of the luminescent layer is faced to the transparent electrode.

Claim 27

An electroluminescent device according to claim 21, wherein said first or second electroluminescent organic compound is represented by the formula: [(X--R.sub.1).sub.m Z].sub.n --φ--R.sub.2 wherein X and R 2 each represent hydrogen, halogen, an alkoxy group, an alkyl ether group, a nitro group; a carboxyl group, a sulfonic acid group, a phosphoric acid group, a silicic acid group, a primary to tertiary amino group, and a metal salt thereof, a primary to tertiary amine salt thereof or an acid salt thereof; an ester group, a sulfamide group, an amide group, an imino group, a quaternary amino group and a salt thereof; a hydroxyl group; R 1 represents a C 4 -C 30 alkyl group; m is 1 or 2; n is an integer of 1 to 4; Z is direct bonding or --O--, --S--, --NR 3 --, --CH 2 NR 3 --, --SO 2 NR 3 --, --CO--, --COO-- (R 3 is hydrogen, an alkyl group or an aryl group); and φ is a fused polycyclic aromatic hydrocarbon, p-terphenyl, 2,5-diphenyloxazole, 1,4-bis(2-methylstyryl)-benzene, xanthine, coumarine, acridine, cyanine dye, benzophenone, phthalocyanine and a metal complex thereof, porphyrin and a metal complex thereof, 8-hydroxyquinoline and a metal complex thereof, an organic ruthenium complex, an organic rare earth complex and a derivative of these compounds, a heterocyclic compound and a derivative thereof, an aromatic polyamine, a compound having quinone structure, tetracyanoquinodimethane and tetracyanoethylene.

Claim 28

An electroluminescent device according to claim 21, wherein, the first electroluminescent organic compound and the first organic compound in the first layer of the luminescent layer are mixed at a molar ratio of 10/1 to 100/1.

Claim 29

An electroluminescent device according to claim 21, wherein the second electroluminescent organic compound and the second organic compound in the second layer of the luminescent layer are mixed at a molar ratio of 10/1 to 100/1.

Claim 30

An electroluminescent device according to claim 21, wherein said luminescent layer has a thickness of 0.01 to 1 μm.

Claim 31

An electroluminescent device according to claim 21, wherein the first layer of the luminescent layer has a thickness of 0.01 to 0.5 μm.

Claim 32

An electroluminescent device, according to claim 21, wherein said second layer comprises 4 to 400 built-up monomolecular films.

Claim 33

An electroluminescent device comprising a luminescent layer of a double-layer structure and a pair of electrodes, wherein a first layer of the luminescent layer comprises a mixed monomolecular film, or built-up film thereof, comprising a first electroluminescent organic compound and a first organic compound, and a second layer of the luminescent layer comprises a mixed monomolecular film, or a built-up film thereof, of a second electroluminescent organic compound and a second organic compound; said first electroluminescent organic compound being electron-acceptable relative to said second layer; said first oragnic compound being electron-acceptable relative to said first electroluminescent organic compound; said second electroluminescent organic compound being electron-donative relative to said first layer; and said second organic compound being electron-donative relative to said second electroluminescent organic compound.

Claim 34

An electroluminescent device comprising a luminescent layer of a double-layer structure and a pair of electrodes, wherein a first layer of the luminescent layer comprises a mixed monomolecular film, or built-up film thereof, comprising a first electroluminescent organic compound and a first organic compound, and a second layer of the luminescent layer comprises a mixed monomolecular film, or a built-up film thereof, of a second electroluminescent organic compound and a second organic compound; said first electroluminescent organic compound being electron-acceptable relative to said second layer; said first oragnic compound being electron-acceptable relative to said first electroluminescent organic compound; said second electroluminescent organic compound being electron-donative relative to said first layer; and said second organic compound being electron-donative relative to said second electroluminescent organic compound.

Claim 35

An electroluminscent device comprising a luminescent layer of a double-layer structure and a pair of eletrodes, wherein a first layer of the luminescent layer comprises a mixed monomolecular film, or a built-up film thereof, comprising a first electroluminescent organic compound and a first organic compound, and a second layer of the luminescent layer comprises a mixed deposited film of a second electroluminescent organic compound and a second organic compound; said first electroluminescent organic compound being electron-acceptable relative to said second layer; said first organic compound being electron-acceptable relative to said first electroluminescent organic compound; said second electroluminescent organic compound being electron-donative relative to said first layer; and said second organic compound being electron-donative relative to said second electroluminescent organic compound.

Claim 36

An electroluminscent device comprising a luminescent layer of a double-layer structure and a pair of eletrodes, wherein a first layer of the luminescent layer comprises a mixed monomolecular film, or a built-up film thereof, comprising a first electroluminescent organic compound and a first organic compound, and a second layer of the luminescent layer comprises a mixed deposited film of a second electroluminescent organic compound and a second organic compound; said first electroluminescent organic compound being electron-acceptable relative to said second layer; said first organic compound being electron-acceptable relative to said first electroluminescent organic compound; said second electroluminescent organic compound being electron-donative relative to said first layer; and said second organic compound being electron-donative relative to said second electroluminescent organic compound.

Claim 37

An electroluminescent device comprising a luminescent layer of a double-layer structure and a pair of electrodes, wherein a first layer of the luminescent layer comprises a mixed deposited film of a first electroluminescent organic compound and a first organic compound, and a second layer of the luminescent layer comprises a mixed monomolecular film, or a built-up film thereof, comprising a second electroluminescent organic compound and a second organic compound; said first electroluminescent organic compound being electron-acceptable relative to said second layer; said first organic compound being electron-acceptable relative to said first electroluminescent organic compound; said second electroluminescent organic compound being electron-donative relative to said first layer; and said second organic compound being electron-donative relative to said second electroluminescent organic compound.

Claim 38

An electroluminescent device comprising a luminescent layer of a double-layer structure and a pair of electrodes, wherein a first layer of the luminescent layer comprises a mixed deposited film of a first electroluminescent organic compound and a first organic compound, and a second layer of the luminescent layer comprises a mixed monomolecular film, or a built-up film thereof, comprising a second electroluminescent organic compound and a second organic compound; said first electroluminescent organic compound being electron-acceptable relative to said second layer; said first organic compound being electron-acceptable relative to said first electroluminescent organic compound; said second electroluminescent organic compound being electron-donative relative to said first layer; and said second organic compound being electron-donative relative to said second electroluminescent organic compound.