Electroluminescent device

Claim 2

An electroluminescent device which comprises a luminescent layer of a double layer structure and a pair of electrodes between which the luminescent layer is sandwiched, a first layer in the double layer structure having a monomolecular film or a monomolecular layer built-up film comprising at least one electroluminescent organic compound which is electron-acceptable relative to a second layer in the double layer structure, and the second layer having a monomolecular film or a monomolecular layer built-up film comprising at least one electroluminescent organic compound which is electron-donative relative to the first layer.

Claim 3

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

Claim 4

An electroluminescent device according to claim 2, wherein the first layer faces on a transparent electrode.

Claim 5

An electroluminescent device according to claim 1, wherein the electroluminescent organic compound has a high luminescent quantum efficiency and π electron system susceptible to external perturbation and can be excited by electric field.

Claim 6

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 a direct bond 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, coumarin, 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 7

An electroluminescent device according to claim 1, wherein the built-up number of monomolecular films is 2 to 400 in total number of the two layers.

Claim 8

An electroluminescent device according to claim 1, wherein the built-up number of monomolecular films is 4 to 400 in total number of the two layers.

Claim 9

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

Claim 10

An electroluminescent device which comprises a luminescent layer of a double layer structure and a pair of electrodes between which the luminescent layer is sandwiched, a first layer in the double layer structure having a monomolecular film or a monomolecular layer built-up film comprising at least one electroluminescent organic compound which is electron-acceptable relative to a second layer in the double layer structure, and the second layer having a molecular deposited film comprising at least one electroluminescent organic compound which is electron-donative relative to the first layer.

Claim 11

An electroluminescent device which comprises a luminescent layer of a double layer structure and a pair of electrodes between which the luminescent layer is sandwiched, a first layer in the double layer structure having a monomolecular film or a monomolecular layer built-up film comprising at least one electroluminescent organic compound which is electron-acceptable relative to a second layer in the double layer structure, and the second layer having a molecular deposited film comprising at least one electroluminescent organic compound which is electron-donative relative to the first layer.

Claim 12

An electroluminescent device according to claim 9, wherein at least one of the pair of electrodes is transparent.

Claim 13

An electroluminescent device according to claim 10, wherein the first layer faces on a transparent electrode.

Claim 14

An electroluminescent device according to claim 9, wherein the electroluminescent organic compound has a high luminescent quantum efficiency and π electron system susceptible to external perturbation and can be excited by electric field.

Claim 15

An electroluminescent device according to claim 9, 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 a direct bond 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, coumarin, 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 16

An electroluminescent device according to claim 9, wherein the built-up number of monomolecular films is 1 to 200 in total number of the two layers.

Claim 17

An electroluminescent device according to claim 9, wherein the built-up number of monomolecular films is 4 to 200 in total number of the two layers.

Claim 18

An electroluminescent device according to claim 9, wherein the whole luminescent layer has a thickness of 0.01 to 1 μm.

Claim 19

An electroluminescent device according to claim 9, wherein the second luminescent layer has a thickness of 0.01 to 0.5 μm.

Claim 20

An electroluminescent device according to claim 9, wherein the whole luminescent layer has a thickness of 0.02 to 1 μm.

Claim 21

An electroluminescent device which comprises a luminescent layer of a double layer structure and a pair of electrodes between which the luminescent layer is sandwiched, a first layer in the double layer structure having a molecular deposited film comprising at least one electroluminescent organic compound which is electron-acceptable relative to a second layer in the double layer structure, and the second layer having a monomolecular film or a monomolecular layer built-up film comprising at least one electroluminescent organic compound which is electron-donative relative to the first layer.

Claim 22

An electroluminescent device which comprises a luminescent layer of a double layer structure and a pair of electrodes between which the luminescent layer is sandwiched, a first layer in the double layer structure having a molecular deposited film comprising at least one electroluminescent organic compound which is electron-acceptable relative to a second layer in the double layer structure, and the second layer having a monomolecular film or a monomolecular layer built-up film comprising at least one electroluminescent organic compound which is electron-donative relative to the first layer.

Claim 23

An electroluminescent device according to claim 19, wherein at least one of the pair of electrodes is transparent.

Claim 24

An electroluminescent device according to claim 20, wherein the first layer faces on a transparent electrode.

Claim 25

An electroluminescent device according to claim 19, wherein the electroluminescent organic compound has a high luminescent quantum efficiency and electron system susceptible to external perturbation and can be excited by electric field.

Claim 26

An electroluminescent device according to claim 19, 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 a direct bond 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, coumarin, 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 27

An electroluminescent device according to claim 19, wherein the luminescent layer has a thickness of 0.01 to 0.05 μm.

Claim 28

An electroluminescent device according to claim 19, wherein the built-up number of monomolecular films is to 200 in total number of the two layers.

Claim 29

An electroluminescent device according to claim 19, wherein the built-up number of monomolecular films is 1 4 to 200 in total number of the two layers.

Claim 30

An electroluminescent device according to claim 19, wherein the whole luminescent layer has a thickness of 0.01 to 1 μm.

Claim 31

An electroluminescent device according to claim 19, wherein the whole luminescent layer has a thickness of 0.02 to 1 μm.