Organic electroluminescence device
First Claim
1. An organic electroluminescence device which comprises light emitting layers placed between a pair of electrodes at least one of which electrodes is transparent or translucent, said light emitting layers comprising a first light emitting layer containing a first organic compound having a solid state fluorenscence peak wave length of 380 nm to shorter than 480 and a second light emitting layer containing a second organic compound having a solid state fluorescence peak wave length of 480 nm to shorter than 580 nm, one of the first and second light emitting layers further comprising a third organic compound having a solution state fluorescence peak wave length of 580 nm to 650 nm in a concentration of 0.1 to 10 mol % with respect to said first organic compound if said third organic compound is present in the first light emitting layer or with respect to said second organic compound if said third organic compound is present in the second light emitting layer;
- said device having a structure in which the first light emitting layer and the second light emitting layer are laminated on an anode in this order and both the first light emitting layer and the second light emitting layer emit light upon application of an electric field, wherein the first organic compound is an aromatic methylidine compound represented by the general formula (I);
##STR30## wherein R1 and R4 indicate each a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an aralkyl group having 7 to 18 carbon atoms, a substituted or unsubstituted aryl group having 6 to 18 carbon atoms, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted cyclohexyl group, or a substituted or unsubstituted aryloxy group having 6 to 18 carbon atoms;
wherein said substituted groups are substituted with one or more substitutes selected from the group consisting of an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an aralkyl group having 7 to 18 carbon atoms, an aryloxy group having 6 to 18 carbon atoms, an acyl group having 1 to 6 carbon atoms, an acyloxy group having 1 to 6 carbon atoms, carboxyl group, styryl group, an arylcarbonyl group having 6 to 20 carbon atoms, an aryloxycarbonyl group having 6 to 20 carbon atoms, an alkoxycarbonyl group having 1 to 6 carbon atoms, vinyl group, anilinocarbonyl group, carbamoyl group, phenyl group, nitro group, hydroxyl group and a hologen atom;
R1 to R4 may be identical to or different from one another;
R1 and R2, and R3 and R4 may combine through a substituent in one or both to form a substituted or unsubstituted saturated or unsaturated five-membered ring or a substituted or unsubstituted saturated or unsaturated six-membered ring;
Ar indicates a substituted or unsubstituted arylene group having 6 to 20 carbon atoms which may be mono-substituted or poly-substituted with a substituent as described above;
substituents in the arylene group may combine with each other to form a substituted or unsubstituted saturated or unsaturated five-membered ring or a substituted or unsubstituted saturated or unsaturated six-membered ring; and
, when Ar is unsubstituted phenylene, R1 to R4 are each a group selected from the group consisting of an alkoxy group having 1 to 6 carbon atoms, an aralkyl group having 7 to 18 carbon atoms, a substituted or unsubstituted naphthyl group, biphenyl group, cyclohexyl group and an aryloxy group.
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Abstract
An organic electroluminescence device comprises the first light emitting layer containing an organic compound having a fluorescence peak wave length of 380 nm or longer to shorter than 480 nm in solid state and the second light emitting layer containing an organic compound having a fluorescence peak wave length of 480 nm or longer to shorter than 580 nm in solid state. One of the first light emitting layer and the second light emitting layer contains an organic compound having a fluorescence peak wave length of 580 nm or longer to 650 nm or shorter in solution state. The device has a structure in which the first light emitting layer and the second light emitting layer are laminated on the anode in this order and both of these layers emit light by application of an electric field. This device shows light emission, particularly white light emission, with high efficiency and excellent stability.
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Citations
48 Claims
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1. An organic electroluminescence device which comprises light emitting layers placed between a pair of electrodes at least one of which electrodes is transparent or translucent, said light emitting layers comprising a first light emitting layer containing a first organic compound having a solid state fluorenscence peak wave length of 380 nm to shorter than 480 and a second light emitting layer containing a second organic compound having a solid state fluorescence peak wave length of 480 nm to shorter than 580 nm, one of the first and second light emitting layers further comprising a third organic compound having a solution state fluorescence peak wave length of 580 nm to 650 nm in a concentration of 0.1 to 10 mol % with respect to said first organic compound if said third organic compound is present in the first light emitting layer or with respect to said second organic compound if said third organic compound is present in the second light emitting layer;
- said device having a structure in which the first light emitting layer and the second light emitting layer are laminated on an anode in this order and both the first light emitting layer and the second light emitting layer emit light upon application of an electric field, wherein the first organic compound is an aromatic methylidine compound represented by the general formula (I);
##STR30## wherein R1 and R4 indicate each a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an aralkyl group having 7 to 18 carbon atoms, a substituted or unsubstituted aryl group having 6 to 18 carbon atoms, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted cyclohexyl group, or a substituted or unsubstituted aryloxy group having 6 to 18 carbon atoms;wherein said substituted groups are substituted with one or more substitutes selected from the group consisting of an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an aralkyl group having 7 to 18 carbon atoms, an aryloxy group having 6 to 18 carbon atoms, an acyl group having 1 to 6 carbon atoms, an acyloxy group having 1 to 6 carbon atoms, carboxyl group, styryl group, an arylcarbonyl group having 6 to 20 carbon atoms, an aryloxycarbonyl group having 6 to 20 carbon atoms, an alkoxycarbonyl group having 1 to 6 carbon atoms, vinyl group, anilinocarbonyl group, carbamoyl group, phenyl group, nitro group, hydroxyl group and a hologen atom; R1 to R4 may be identical to or different from one another;
R1 and R2, and R3 and R4 may combine through a substituent in one or both to form a substituted or unsubstituted saturated or unsaturated five-membered ring or a substituted or unsubstituted saturated or unsaturated six-membered ring;Ar indicates a substituted or unsubstituted arylene group having 6 to 20 carbon atoms which may be mono-substituted or poly-substituted with a substituent as described above;
substituents in the arylene group may combine with each other to form a substituted or unsubstituted saturated or unsaturated five-membered ring or a substituted or unsubstituted saturated or unsaturated six-membered ring; and
, when Ar is unsubstituted phenylene, R1 to R4 are each a group selected from the group consisting of an alkoxy group having 1 to 6 carbon atoms, an aralkyl group having 7 to 18 carbon atoms, a substituted or unsubstituted naphthyl group, biphenyl group, cyclohexyl group and an aryloxy group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- said device having a structure in which the first light emitting layer and the second light emitting layer are laminated on an anode in this order and both the first light emitting layer and the second light emitting layer emit light upon application of an electric field, wherein the first organic compound is an aromatic methylidine compound represented by the general formula (I);
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9. An organic electroluminescence device which comprises light emitting layers placed between a pair of electrodes at least one of which electrodes is transparent or translucent, said light emitting layers comprising a first light emitting layer containing a first organic compound having a solid state fluorescence peak wave length of from 380 nm to shorter than 480 nm and a second light emitting layer containing a second organic compound having a solid state fluorescence peak wave length of 480 nm to shorter than 580 nm, one of said first and second light emitting layers further comprising a third organic compound having a solution state fluorescence peak wave length of 580 nm to 650 nm in a concentration of 0.1 to 10 mol % with respect to said first organic compound if said third organic compound is present in the first light emitting layer or with respect to said second organic compound if said third organic compound is present in the second light emitting layer;
- said device having a structure in which the first light emitting layer and the second light emitting layer are laminated on an anode in this order and both the first light emitting layer and the second light emitting layer emit light upon application of an electric field, wherein the organic compound having a luminescence peak wave length of 380 nm to shorter than 480 nm in solid state is an aromatic methylidine compound represented by the general formula (II);
space="preserve" listing-type="equation">A--Q--B (II)wherein A and B indicate each a monovalent group having a structure obtained by removing one hydrogen atom from a compound represented by the general formula (I);
##STR31## wherein R1 to R4 indicate each a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an aralkyl group having 7 to 18 carbon atoms, a substituted or unsubstituted aryl group having 6 to 18 carbon atoms, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted cyclohexyl group, or a substituted or unsubstituted aryloxy group having 6 to 18 carbon atoms;wherein said substituted groups are substituted with one or more substituents selected from the group consisting of an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an aralkyl group having 7 to 18 carbon atoms, an aryloxy group having 6 to 18 carbon atoms, an acyl group having 1 to 6 carbon atoms, an acyloxy group having 1 to 6 carbon atoms, carboxyl group, styryl group, an arylcarbonyl group having 6 to 20 carbon atoms, an aryloxycarbonyl group having 6 to 20 carbon atoms, an alkoxycarbonyl group having 1 to 6 carbon atoms, vinyl group, anilinocarbonyl group, carbamoyl group, phenyl group, nitro group, hydroxyl group and a halogen atom; R1 to R4 may be identical to or different from one another;
R1 and R2, and R3 and R4 may combine through a substituent in one or both to form a substituted or unsubstituted saturated or unsaturated five-membered ring or a substituted or unsubstituted saturated or unsaturated six-membered ring;Ar indicates a substituted or unsubstituted arylene group having 6 to 20 carbon atoms which may be mono-substituted or poly-substituted with a substituent as described above;
substituents in the arylene group may combine with each other to form a substituted or unsubstituted saturated or unsaturated five-membered ring or a substituted or unsubstituted saturated or unsaturated six-membered ring; and
, when Ar is unsubstituted phenylene, R1 to R4 are each a group selected from the group consisting of an alkoxy group having 1 to 6 carbon atoms, an aralkyl group having 7 to 18 carbon atoms, a substituted or unsubstituted naphthyl group, biphenyl group, cyclohexyl group and an aryloxy group,wherein A and B may be identical to or different from each other, and Q indicates a divalent group breaking the conjugation. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
- said device having a structure in which the first light emitting layer and the second light emitting layer are laminated on an anode in this order and both the first light emitting layer and the second light emitting layer emit light upon application of an electric field, wherein the organic compound having a luminescence peak wave length of 380 nm to shorter than 480 nm in solid state is an aromatic methylidine compound represented by the general formula (II);
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17. An organic electroluminescence device which comprises light emitting layers placed between a pair of electrodes at least one of which electrodes is transparent or translucent, said light emitting layers comprising a first light emitting layer containing a first organic compound having a solid state fluorescence peak wave length of from 380 nm to shorter than 480 nm and a second light emitting layer containing a second organic compound having a solid state fluorescence peak wave length of 480 nm to shorter than 580 nm, one of said first and second light emitting layers further comprising a third organic compound having a solution state fluorescence peak wave length of 580 nm to 650 nm in a concentration of 0.1 to 10 mol % with respect to said first organic compound if said third organic compound is present in the first light emitting layer or with respect to said second organic compound if said third organic compound is present in the second light emitting layer;
- said device having a structure in which the first light emitting layer and the second light emitting layer are laminated on an anode in this order and both the first light emitting layer and the second light emitting layer emit light upon application of an electric field,
wherein the first organic compound is an aromatic methylidine compound represented by the general formula (III);
##STR32## wherein A1 indicates a substituted or unsubstituted arylene group having 6 to 20 carbon atoms or a substituted or unsubstituted divalent aromatic heterocyclic group;
A2 indicates a substituted or unsubstituted aryl group having 6 to 20 carbon atoms or a substituted or unsubstituted monovalent aromatic heterocyclic group, R5 and R6 indicate each a hydrogen atom, a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, cyclohexyl group, a monovalent aromatic heterocyclic group, an alkyl group having 1 to 10 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms, and may be identical to or different from each other;
wherein said substituted groups are substituted with one or more of an alkyl group, an aryloxy group, amino group or a phenyl group which is unsubstituted or substituted with an alkyl group, an aryloxy group or an amino group;
each substitutent in R5 may combine with A1 to form a saturated or unsaturated five-membered or six-membered ring;
each substituent in R6 may combine with A2 to form a saturated or unsaturated five-membered or six-membered ring; and
Q1 indicates a divalent group breaking the conjugation. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
- said device having a structure in which the first light emitting layer and the second light emitting layer are laminated on an anode in this order and both the first light emitting layer and the second light emitting layer emit light upon application of an electric field,
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25. An organic electroluminescence device which comprises light emitting layers placed between a pair of electrodes at least one of which electrodes is transparent or translucent, said light emitting layers comprising a first light emitting layer containing a first organic compound having a solid state fluorescence peak wave length of from 380 nm to shorter than 480 nm and a second light emitting layer containing a second organic compound having a solid state fluorescence peak wave length of 480 nm to shorter than 580 nm, one of said first and second light emitting layers further comprising a third organic compound having a solution state fluorescence peak wave length of 580 nm to 650 nm in a concentration of 0.1 to 10 mol % with respect to said first organic compound if said third organic compound is present in the first light emitting layer or with respect to said second organic compound if said third organic compound is present in the second light emitting layer;
- said device having a structure in which the first light emitting layer and the second light emitting layer are laminated on an anode in this order and both the first light emitting layer and the second light emitting layer emit light upon application of an electric field, wherein the first light emitting layer and/or the second light emitting layer comprise at least one compound selected from stilbene derivatives respresented by the general formulae (IV) and (V);
##STR33## wherein Ar1 indicates an aryl group having 6 to 20 carbon atoms;
R7 to R10 indicate each independently a hydrogen atom or an aryl group having 6 to 20 carbon atoms; and
D1 to D3 indicate each independently an aryl group having 6 to 20 carbon atoms and substituted with an electron-donating group or a condensed polycyclic group having 10 to 30 carbon atoms and substituted with an electron-donating group;
therein Ar1 and R7 to R10 may be each independently unsubstituted or substituted with an alkyl group having 1 to 10 carbon atoms, an aklkoxy group having 1 to 10 carbon atoms, an aryloxy group having 6 to 10 carbon atoms, an aralkyl group having 6 to 10 carbon atoms or an amino group containing hydrocarbon groups having 1 to 20 carbon atoms. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
- said device having a structure in which the first light emitting layer and the second light emitting layer are laminated on an anode in this order and both the first light emitting layer and the second light emitting layer emit light upon application of an electric field, wherein the first light emitting layer and/or the second light emitting layer comprise at least one compound selected from stilbene derivatives respresented by the general formulae (IV) and (V);
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33. An organic electroluminescence device which comprises light emitting layers placed between a pair of electrodes at least one of which electrodes is transparent or translucent, said light emitting layers comprising a first light emitting layer containing a first organic compound having a solid state fluorescence peak wave length of from 380 nm to shorter than 480 nm and a second light emitting layer containing a second organic compound having a solid state fluorescence peak wave length of 480 nm to shorter than 580 nm, one of said first and second light emitting layers further comprising a third organic compound having a solution state fluorescence peak wave length of 580 nm to 650 nm in a concentration of 0.1 to 10 mol % with respect to said first organic compound if said third organic compound is present in the first light emitting layer or with respect to said second organic compound if said third organic compound is present in the second light emitting layer;
- said device having a structure in which the first light emitting layer and the second light emitting layer are laminated on an anode in this order and both the first light emitting layer and the second light emitting layer emit light upon application of an electric field, wherein at least one of the first light emitting layer and the second light emitting layer comprises at least one compound selected from distyrylarylene derivatives represented by the general formulae (VI) and (VII);
##STR34## wherein Ar2 and Ar3 indicate each independently an arylene group having 6 to 20 carbon atoms;
Ar4 indicates an aryl group having 6 to 20 carbon atoms;
R11 to R18 indicate each independently a hydrogen atom or an aryl group having 6 to 20 carbon atoms;
wherein Ar2 to Ar4 and R11 to R18 may be each independently unsubstituted or substituted with an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an aryloxy group having 6 to 10 carbon atoms, an aralkyl group having 6 to 10 carbon atoms or an amino group containing hydrocarbon groups having 1 to 20 carbon atoms; and
D4 to D6 indicate each independently an aryl group having 6 to 20 carbon atoms and substituted with an electron-donating group or a condensed polycyclic group having 10 to 30 carbon atoms and substituted with an electron-donating group. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40)
- said device having a structure in which the first light emitting layer and the second light emitting layer are laminated on an anode in this order and both the first light emitting layer and the second light emitting layer emit light upon application of an electric field, wherein at least one of the first light emitting layer and the second light emitting layer comprises at least one compound selected from distyrylarylene derivatives represented by the general formulae (VI) and (VII);
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41. An organic electroluminescence device which comprises light emitting layers placed between a pair of electrodes at least one of which electrodes is transparent or translucent, said light emitting layers comprising a first light emitting layer containing a first organic compound having a solid state fluorescence peak wave length of from 380 nm to shorter than 480 nm and a second light emitting layer containing a second organic compound having a solid state fluorescence peak wave length of 480 nm to shorter than 580 nm, one of said first and second light emitting layers further comprising a third organic compound having a solution state fluorescence peak wave length of 580 nm to 650 nn in a concentration of 0.1 to 10 mol % with respect to said first organic compound if said third organic compound is present in the first light emitting layer or with respect to said second organic compound if said third organic compound is present in the second light emitting layer;
- said device having a structure in which the first light emitting layer and the second light emitting layer are laminated on an anode in this order and both the first light emitting layer and the second light emitting layer emit light upon application of an electric field, wherein at least one of the first light emitting layer and the second light emitting layer comprises at least one compound selected from trisstyrylarylene derivatives represented by the general formulae (VIII), (IX) and (X);
##STR35## wherein Ar5 and Ar7 indicate each independently a trivalent aromatic cyclic group having 6 to 24 carbon atoms;
Ar8 to Ar10 indicate each independently an aryl group having 6 to 20 carbon atoms;
R19 to R36 indicate each independently a hydrogen atom or an aryl group having 6 to 20 carbon atoms; and
D7 to D12 indicate each independently an aryl group having 6 to 20 carbon atoms and substituted with an electron-donating group or a condensed polycyclic group having 10 to 30 carbon atoms and substituted with an electron-donating group;
therein Ar5 to Ar7 and R19 to R36 may be each independently unsubstituted or substituted with an alky group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an aryloxy group having 6 to 10 carbon atoms, an aralkyl group having 6 to 10 carbon atoms or an amino group containing hydrocarbon groups having 1 to 20 carbon atoms. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48)
- said device having a structure in which the first light emitting layer and the second light emitting layer are laminated on an anode in this order and both the first light emitting layer and the second light emitting layer emit light upon application of an electric field, wherein at least one of the first light emitting layer and the second light emitting layer comprises at least one compound selected from trisstyrylarylene derivatives represented by the general formulae (VIII), (IX) and (X);
Specification