US20090066225A1 - Aromatic amine derivative and organic electroluminescence device utilizing the same - Google Patents

Aromatic amine derivative and organic electroluminescence device utilizing the same Download PDF

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US20090066225A1
US20090066225A1 US11/909,003 US90900306A US2009066225A1 US 20090066225 A1 US20090066225 A1 US 20090066225A1 US 90900306 A US90900306 A US 90900306A US 2009066225 A1 US2009066225 A1 US 2009066225A1
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substituted
aromatic amine
amine derivative
unsubstituted
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Makoto Kimura
Chishio Hosokawa
Masakazu Funahashi
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Idemitsu Kosan Co Ltd
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Definitions

  • the present invention relates to an aromatic amine derivative and an organic electroluminescent (EL) device using the same. More specifically, the present invention relates to an organic EL device having high emission luminance, high heat resistance, excellent high-temperature storage stability, and a long lifetime and to an aromatic amine derivative for realizing the organic EL device.
  • EL organic electroluminescent
  • An organic EL device using an organic substance has been used as the flat luminous body of a wall hanging television or as a light source for, for example, the backlight of a display, and has been vigorously developed.
  • Examples of the organic host substance include naphthalene, anthracene, phenanthrene, tetracene, pyrene, benzopyrene, chrysene, picene, carbazole, fluorene, biphenyl, terphenyl, triphenylene oxide, dihalobiphenyl, trans-stilbene, and 1,4-diphenylbutadiene.
  • Examples of the activator include anthracene, tetracene, and pentacene.
  • each of those organic light-emitting substances is present in the form of a single layer having a thickness in excess of 1 ⁇ m, so a high electric field is needed to cause such substance to emit light.
  • the organic EL device has, for example, practically insufficient emission luminous and practically insufficient durability against the deterioration of the device with time due to long-term use, so the additional improvement of the device has been requested.
  • the device when one attempts to apply the device to a full-color display or the like, the device is requested to achieve a half life of several thousand hours or longer at a high luminance of 300 cd/m 2 or more for each of R, G, and B colors. It is difficult to achieve such half life particularly in the case of blue light emission. Blue light emission requires a large energy gap of the light-emitting layer (2.8 eV or more).
  • an energy barrier upon hole injection between the hole-transporting layer and the light-emitting layer is large. Accordingly, the intensity of an electric field to be applied to an interface between the hole-transporting layer and the light-emitting layer is large. Therefore, the conventional hole-transporting layer has not allowed stable hole injection, so the improvement of the layer has been requested.
  • the storage performance of the organic EL device at a high temperature equal to or higher than 100° C. is problematic on the precondition that the device is mounted on a vehicle.
  • the glass transition temperature of the conventional hole-transporting layer is low.
  • this approach has been still insufficient to realize good storage performance at high temperature.
  • an exciplex occurs as an interaction between the hole-transporting layer and the light-emitting layer to deteriorate the luminance of the device.
  • Patent Document 1 U.S. Pat. No. 4,356,429
  • Patent Document 1 Appl. Phys. Lett. 51 (1987) 913
  • the present invention has been made with a view to solving the above problems, and an object of the present invention is to provide an organic EL device having high emission luminance, high heat resistance, and a long lifetime, and an aromatic amine derivative for realizing the device.
  • the inventors of the present invention have made extensive studies with a view to achieving the above object. As a result, the inventors have found that the use of a novel aromatic amine derivative represented by the following general formula (1) as a material for an organic EL device can improve the emission luminance, heat resistance, and lifetime of an organic EL device to be obtained. Thus, the inventors have completed the present invention.
  • the present invention provides an aromatic amine derivative represented by any one of the following general formulae (1) to (4):
  • Ar 1 to Ar 7 each independently represent a substituted or unsubstituted aryl group having 5 to 40 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 40 ring atoms, and may be identical to or different from one another, provided that a case where a substituent in each of the groups represented by Ar 1 , Ar 2 , Ar 3 , and Ar 4 comprises a group containing a vinyl group is excluded;
  • R 1 to R 22 and A 1 to A 3 each independently represent a hydrogen atom, a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 50 ring carbon atoms, a substituted or unsubstituted aryloxy group having 5 to 50 ring carbon atoms, a substituted or unsubstituted arylthio group having 5 to 50 ring carbon atoms, a substituted or unsubstituted alkoxycarbonyl group having 1 to 50 carbon atoms, an amino group substituted by a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms, a substituted or unsubstituted silyl group, a
  • n an integer of 3 to 6
  • m represents an integer of 2 to 5
  • x, y, and z each represent an integer of 0 to 3, and, when x, y, or z represents 2 or more, A 1 's, A 2 's, or A 3 's may be identical to or different from each other, and
  • the present invention provides also an organic EL device including an organic thin film layer composed of one or more layers including at least a light emitting layer, the organic thin film layer being interposed between a cathode and an anode, in which at least one layer of the organic thin film layer contains the aromatic amine derivative alone or as a component of a mixture.
  • Each of the aromatic amine derivative of the present invention and the organic EL device using the derivative has high emission luminance, high heat resistance, excellent high-temperature storage stability, and a long lifetime.
  • FIG. 1 A view showing the 1 H-NMR spectrum of Compound (5) obtained in Synthesis Example 3.
  • An aromatic amine derivative of the present invention is represented by any one of the following general formulae (1) to (4):
  • Ar 1 to Ar 7 each independently represent a substituted or unsubstituted aryl group having 5 to 40 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 40 ring atoms, and may be identical to or different from one another, provided that a case where a substituent in each of the groups represented by Ar 1 , Ar 2 , Ar 3 , and Ar 4 includes a group containing a vinyl group is excluded.
  • the substituted or unsubstituted aryl group having 5 to 40 ring carbon atoms represented by any one of Ar 1 to Ar 7 is preferably an aryl group having 5 to 40 ring carbon atoms which is substituted by an aryl group, an alkyl group, an alkoxy group, an aralkyl group, an aryloxy group, an arylthio group, or an alkoxycarbonyl group, or is unsubstituted, and specific examples of those groups include those described later for R 1 to R 22 and A 1 to A 3 .
  • aryl groups of Ar 1 to Ar 7 and heterocyclic ring groups include a phenyl group, a 1-naphthyl group, a 2-naphthyl group, a 1-anthryl group, a 2-anthryl group, a 9-anthryl group, a 1-phenanthryl group, a 2-phenanthryl group, a 3-phenanthryl group, a 4-phenanthryl group, a 9-phenanthryl group, a 1-naphthacenyl group, a 2-naphthacenyl group, a 9-naphthacenyl group, a 1-pyrenyl group, a 2-pyrenyl group, a 4-pyrenyl group, a 2-biphenylyl group, a 3-biphenylyl group, a 4-biphenylyl group, a p-terphenyl-4-yl group, a p-terphenyl-3-yl group
  • a phenyl group, a naphthyl group, a biphenyl group, an anthranyl group, a phenanthryl group, a pyridinyl group, a pyrenyl group, a chrysenyl group, a fluoranthenyl group, and a fluorenyl group are preferable.
  • R 1 to R 22 and A 1 to A 3 each independently represent a hydrogen atom, a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 50 ring carbon atoms, a substituted or unsubstituted aryloxy group having 5 to 50 ring carbon atoms, a substituted or unsubstituted arylthio group having 5 to 50 ring carbon atoms, a substituted or unsubstituted alkoxycarbonyl group having 1 to 50 carbon atoms, an amino group substituted with a substituted or unsubstituted aryl group having 5 to 50 carbon atoms, a substituted or unsubstituted
  • Examples of a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms in any one of the R 1 to R 22 and A 1 to A 3 include a phenyl group, a 1-naphthyl group, a 2-naphthyl group, a 1-anthryl group, a 2-anthryl group, a 9-anthryl group, a 1-phenanthryl group, a 2-phenanthryl group, a 3-phenanthryl group, a 4-phenanthryl group, a 9-phenanthryl group, a 1-naphthacenyl group, a 2-naphthacenyl group, a 9-naphthacenyl group, a 1-pyrenyl group, a 2-pyrenyl group, a 4-pyrenyl group, a 2-biphenylyl group, a 3-biphenylyl group, a 4-biphenylyl group, a p
  • a phenyl group, a naphthyl group, a biphenyl group, an anthranyl group, a phenanthryl group, a pyrenyl group, a chrysenyl group, a fluoranthenyl group, or a fluorenyl group is preferable.
  • Examples of the substituted or unsubstituted alkyl group having 1 to 50 carbon atoms in any one of the R 1 to R 22 and A 1 to A 3 include a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, an s-butyl group, an isobutyl group, a t-butyl group, an n-pentyl group, an n-hexyl group, an n-heptyl group, an n-octyl group, a hydroxymethyl group, a 1-hydroxyethyl group, a 2-hydroxyethyl group, a 2-hydroxyisobutyl group, a 1,2-dihydroxyethyl group, a 1,3-dihydroxyisopropyl group, a 2,3-dihydroxy-t-butyl group, a 1,2,3-trihydroxypropyl group, a chloromethyl group, a 1-chlor
  • the substituted or unsubstituted alkoxy group having 1 to 50 carbon atoms in any one of the R 1 to R 22 and A 1 to A 3 is represented by —OY, and examples of Y include the same examples as those described for the above-mentioned alkyl group.
  • Examples of the substituted or unsubstituted aralkyl group having 6 to 50 ring carbon atoms in any one of the R 1 to R 22 and A 1 to A 3 include a benzyl group, a 1-phenylethyl group, a 2-phenylethyl group, a 1-phenylisopropyl group, a 2-phenylisopropyl group, a phenyl-t-butyl group, an ⁇ -naphthylmethyl group, a 1- ⁇ -naphthylethyl group, a 2- ⁇ -naphthylethyl group, a 1- ⁇ -naphthylisopropyl group, a 2- ⁇ -naphthylisopropyl group, a ⁇ -naphthylmethyl group, a 1- ⁇ -naphthylethyl group, a 2- ⁇ -naphthylethyl group, a 1- ⁇
  • the substituted or unsubstituted aryloxy group having 5 to 50 ring carbon atoms for each of the R 1 to R 22 and A 1 to A 3 is represented by —OY′, and examples of Y′ include examples similar to those described for the aryl group represented by any one of Ar 2 to Ar 4 .
  • the substituted or unsubstituted arylthio group having 5 to 50 ring carbon atoms for each of the R 1 to R 22 and A 1 to A 3 is represented by —SY′, and examples of Y′ include examples similar to those described for the aryl group represented by any one of Ar 2 to Ar 4 .
  • the substituted or unsubstituted alkoxycarbonyl group having 1 to 50 carbon atoms for each of the R 1 to R 22 and A 1 to A 3 is a group represented by —COOY, and examples of Y include examples similar to those described for the alkyl group.
  • Examples of a substituted or unsubstituted aryl group having 5 to 50 ring carbon atoms in the amino group substituted by the aryl group for each of the R 1 to R 22 and A 1 to A 3 include examples similar to those described for the aryl group represented by any one of Ar 1 to Ar 7 .
  • Examples of the silyl group represented by any one of R 1 to R 22 and A 1 to A 3 include a trimethylsilyl group, a triethylsilyl group, a t-butyldimethylsilyl group, a vinyldimethylsilyl group, and a propyldimethylsilyl group.
  • halogen atom as a substituent for each of the R 1 to R 22 and A 1 to A 3 include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
  • substituents for the respective groups in the general formulae (1) to (4) include: an alkyl group having 1 to 10 carbon atoms (such as a methyl group, an ethyl group, an i-propyl group, an n-propyl group, an n-butyl group, an s-butyl group, a t-butyl group, an n-pentyl group, a cyclopentyl group, an n-hexyl group, or a cyclohexyl group); an alkoxy group having 1 to 10 carbon atoms (such as an ethoxy group, a methoxy group, an i-propoxy group, an n-propoxy group, an s-butoxy group, a t-butoxy group, a pentoxy group, a hexyloxy group, a cyclopentoxy group, or a cyclohexyloxy group); an aryl group having 5 to 40 ring carbon atoms (
  • an alkyl group having 1 to 10 carbon atoms, and an alkoxy group having 1 to 10 carbon atoms are preferable, an alkyl group having 1 to 6 carbon atoms is more preferable, and a methyl group, an ethyl group, an i-propyl group, an n-propyl group, an n-butyl group, an s-butyl group, a t-butyl group, an n-pentyl group, a cyclopentyl group, an n-hexyl group, or a cyclohexyl group is particularly preferable.
  • n represents an integer of 3 to 6, or preferably 3 to 5.
  • m represents an integer of 2 to 5, or preferably 2 to 4.
  • x, y, and z each represent an integer of 0 to 3, and, when x, y, or z represents 2 or more, A 1 's, A 2 's, or A 3 's may be identical to or different from each other.
  • ring examples include: cycloalkanes each having 4 to 12 ring carbon atoms such as cyclobutane, cyclopentane, cyclohexane, adamantane, and norbornane; cycloalkenes each having 4 to 12 ring carbon atoms such as cyclobutene, cyclopentene, cyclohexene, cycloheptene, and cyclooctene; cycloalkadienes each having 5 to 12 ring carbon atoms such as cyclopentadiene, cyclohexadiene, cycloheptadiene, and cyclooctadiene; aromatic rings each having 6 to 50 ring carbon atoms such as benzene, naphthalene, phenanthrene, anthracene, pyrene, chrysene, and acenaphthylene; and heterocyclic rings each having 5 to 50 ring atoms such as
  • the aromatic amine derivative represented by the general formula (1) of the present invention is preferably an aromatic amine derivative represented by the following general formula (1-a), (1-b), or (1-c):
  • Ar 8 to Ar 19 each have the same meaning as that of any one of Ar 1 to Ar 4 described above
  • R 23 to R 40 each have the same meaning as that of any one of R 1 to R 4 described above
  • specific examples and preferable examples of each of these groups include examples similar to those described above, provided that the case where a substituent in each of the groups represented by Ar 8 to Ar 19 is a group containing a vinyl group is excluded.
  • the aromatic amine derivative represented by the general formula (2) of the present invention is preferably an aromatic amine derivative represented by the following general formula (2-a), (2-b), or (2-c):
  • Ar 20 to Ar 25 each have the same meaning as that of any one of Ar 5 to Ar 6 described above
  • R 41 to R 58 each have the same meaning as that of any one of R 5 to R 10 described above
  • specific examples and preferable examples of each of these groups include examples similar to those described above.
  • the aromatic amine derivative represented by the general formula (3) of the present invention is preferably an aromatic amine derivative represented by the following general formula (3-a) or (3-b):
  • R 59 to R 68 each have the same meaning as that of any one of R 11 to R 16 described above, and specific examples and preferable examples of each of these groups include examples similar to those described above.
  • the aromatic amine derivative represented by the general formula (4) of the present invention is preferably an aromatic amine derivative represented by the following general formula (4-a) or (4-b):
  • R 69 to R 78 each have the same meaning as that of any one of R 17 to R 22 described above, and specific examples and preferable examples of each of these groups include examples similar to those described above.
  • the aromatic amine derivative of the present invention is preferably a material for an organic EL device, or is more preferably a hole-transporting material for an organic EL device or a doping material for an organic EL device.
  • aromatic amine derivative represented by each of the general formulae (1) to (4) of the present invention are shown below. However, the aromatic amine derivative is not limited to these exemplified compounds.
  • a method of producing the aromatic amine derivative represented by the general formula (1) of the present invention is not particularly limited, and it is sufficient to produce the derivative by a known method.
  • a condensed oligofluorene compound is derived by, for example, a method reported in “the 84th spring annual meeting of the Chemical Society of Japan 3E1-33 (2004) (Makoto Kimura et al.)” or “a method described in J. Am. Chem. Soc., 126, 6987-6995 (2004) (Josemon Jacob et al.)”.
  • the condensed oligofluorene compound is halogenated, whereby a halogen derivative of a condensed oligofluorene is synthesized.
  • a reagent for use in the halogenation when a halogen atom for use in the halogenation is bromine include bromine, N-bromosuccinimide (NBS), KBr, KBrO 3 , AlBr 3 , PBr 3 , SbBr 3 , FeBr 2 , PyHBrCl 2 , and Bu 4 NBr 3 . Of those, bromine and NBS are preferable.
  • Examples of a reagent for use in the halogenation when a halogen atom for use in the halogenation is a halogen atom except bromine include products each obtained by replacing bromine in each of those examples with the corresponding halogen atom.
  • the halogenation is preferably performed in an organic solvent such as carbon tetrachloride, chloroform, methylene chloride, acetic acid, pyridine, or dimethylformamide (DMF), or in sulfuric acid.
  • a reaction system may be added with a peroxide such as benzoyl peroxide (BPO), 2,2′-azobisisobutyronitrile (AIBN), or m-chloroperbenzoic acid (mCPBA), or a heavy metal salt, or may be irradiated with light.
  • a peroxide such as benzoyl peroxide (BPO), 2,2′-azobisisobutyronitrile (AIBN), or m-chloroperbenzoic acid (mCPBA), or a heavy metal salt, or may be irradiated with light.
  • a reaction temperature at the time of the halogenation ranges from typically room temperature to 150° C., or preferably room temperature to 100° C., and a reaction time at the time of the halogenation ranges from typically 1 to 120 hours, or preferably 6 to 18 hours.
  • the halogen derivative is aminated with a diarylamine, whereby an aromatic amine is produced.
  • a transition metal is preferably used as a catalyst at the time of the amination.
  • transition metal examples include manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), palladium (Pd), molybdenum (Mo), rhodium (Rh), ruthenium (Ru), vanadium (V), chromium (Cr), platinum (Pt), and iridium (Ir).
  • Mn manganese
  • Fe iron
  • Co cobalt
  • Ni nickel
  • Cu copper
  • Mo molybdenum
  • Mo molybdenum
  • Rhodium ruthenium
  • V vanadium
  • Cr chromium
  • platinum platinum
  • Ir iridium
  • each of those transition metals is preferably used in the form of, for example, a fine powder.
  • each of the metals is preferably used in the form of, for example, a transition metal complex or a transition metal compound.
  • the organic EL device of the present invention includes one or multiple organic thin film layers including at least a light-emitting layer, the one or multiple organic thin film layers being interposed between the cathode and the anode, in which at least one layer of the one or multiple organic thin film layers contains the aromatic amine derivative of the present invention alone or as a component of a mixture.
  • the one or multiple organic thin film layers have a hole-transporting layer, and the hole-transporting layer contains the aromatic amine derivative of the present invention alone or as a component of a mixture. Further, it is preferable that the main component of the hole-transporting layer be the aromatic amine derivative of the present invention.
  • the light-emitting layer contain the aromatic amine derivative of the present invention alone or as a component of a mixture. It is still more preferable that the light-emitting layer contain the aromatic amine derivative of the present invention as a doping material.
  • the aromatic amine derivative of the present invention is particularly preferable as an organic EL device emitting blue-based light.
  • the organic EL device having multiple organic thin film layers is a laminate having, for example, an (anode/hole-injecting layer/light-emitting layer/cathode), (anode/light-emitting layer/electron-injecting layer/cathode), or (anode/hole-injecting layer/light-emitting layer/electron-injecting layer/cathode) constitution.
  • an additional known light-emitting material, doping material, hole-injecting material, or electron-injecting material can be used as required in the multiple layers.
  • a reduction in luminance or lifetime due to quenching can be prevented.
  • a light-emitting material, a doping material, a hole-injecting material, and an electron-injecting material can be used in combination.
  • a doping material can provide improvements in emission luminance and luminous efficiency, and red or blue light emission.
  • each of the hole-injecting layer, the light-emitting layer, and the electron-injecting layer may be formed of a layer constitution having two or more layers.
  • a layer for injecting a hole from the electrode is referred to as a hole-injecting layer
  • a layer for receiving the hole from the hole-injecting layer and transporting the hole to the light-emitting layer is referred to as a hole-transporting layer.
  • a layer for injecting an electron from the electrode is referred to as an electron-injecting layer
  • a layer for receiving the electron from the electron-injecting layer and transporting the electron to the light-emitting layer is referred to as an electron-transporting layer.
  • Each of those layers is selected and used depending on factors such as the energy level of a material, heat resistance, and adhesiveness between the layer and an organic layer or a metal electrode.
  • Examples of a host material or a doping material available for the light-emitting layer together with the aromatic amine derivative of the present invention include, but not limited to: for example, large amounts of condensed aromatic compounds such as naphthalene, phenanthrene, rubrene, anthracene, tetracene, pyrene, perylene, chrysene, decacyclene, coronene, tetraphenylcyclopentadiene, pentaphenylcyclopentadiene, fluorene, spirofluorene, 9,10-diphenylanthracene, 9,10-bis(phenylethinyl)anthracene, and 1,4-bis(9′-ethynylanthracenyl)benzene and derivatives thereof; organic metal complexes such as tris(8-quinolinolato)aluminum or bis-(2-methyl-8-quinolinolato)-4-(phenylphenol
  • a compound having an ability of transporting a hole, having hole injection efficiency from an anode and excellent hole injection efficiency to a light-emitting layer or a light-emitting material, preventing the migration of an exciton generated in the light-emitting layer to an electron-injecting layer or an electron-injecting material, and having excellent thin film-formability is preferable as a hole-injecting material.
  • the compound include, but not limited to, a phthalocyanine derivative, a naphthalocyanine derivative, a porphyrin derivative, oxazole, oxadiazole, triazole, imidazole, imidazolone, imidazolethione, pyrazoline, pyrazolone, tetrahydroimidazole, oxazole, oxadiazole, hydrazone, acylhydrazone, polyarylalkane, stilbene, butadiene, benzidine type triphenylamine, styrylamine type triphenylamine, diamine type triphenylamine, derivatives thereof, and polymer materials such as polyvinyl carbazole, polysilane, and a conductive polymer.
  • additional effective hole-injecting materials are an aromatic tertiary amine derivative and a phthalocyanine derivative.
  • aromatic tertiary amine derivative includes, but not limited to, for example, triphenylamine, tritolylamine, tolyldiphenylamine, N,N′-diphenyl-N,N′-(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine, N,N,N′,N′-(4-methylphenyl)-1,1′-phenyl-4,4′-diamine, N,N,N′,N′-(4-methylphenyl)-1,1′-biphenyl-4,4′-diamine, N,N′-diphenyl-N,N′-dinaphthyl-1,1′-biphenyl-4,4′-diamine, N,N′-(methylphenyl)-N,N′-(4-n-butylphenyl)-phenanthrene-9,10-d iamine, or N,N-bis(4-di-4-
  • phthalocyanine (Pc) derivative examples include, but not limited to, for example, phthalocyanine derivatives such as H 2 Pc, CuPc, CoPc, NiPc, ZnPc, PdPc, FePc, MnPc, ClAlPc, ClGaPc, ClInPc, ClSnPc, Cl 2 SiPc, (HO)AlPc, (HO)GaPc, VOPc, TiOPc, MoOPc, and GaPc-O—GaPc, and naphthalocyanine derivatives.
  • phthalocyanine derivatives such as H 2 Pc, CuPc, CoPc, NiPc, ZnPc, PdPc, FePc, MnPc, ClAlPc, ClGaPc, ClInPc, ClSnPc, Cl 2 SiPc, (HO)AlPc, (HO)GaPc, VOPc, TiOPc, MoOPc, and GaPc
  • the organic EL device of the present invention is preferably formed of a layer containing each of those aromatic tertiary amine derivatives and/or each of phthalocyanine derivatives between a light-emitting layer and an anode, for example, the hole-transporting layer or the hole-injecting layer.
  • a compound having an ability of transporting electrons, having electron injection efficiency from a cathode and excellent electron injection efficiency to a light-emitting layer or a light-emitting material, preventing the migration of an exciton generated in the light-emitting layer to the hole-injecting layer, and having excellent thin film-formability is preferable as an electron-injecting material.
  • the compound examples include fluorenone, anthraquinodimethane, diphenoquinone, thiopyranedioxide, oxazole, oxadiazole, triazole, imidazole, perylenetetracarboxylic acid, fluorenylidenemethane, anthraquinodimethane, anthrone, and derivatives thereof, but the compound is not limited thereto.
  • an electron-accepting substance can be added to the hole-injecting material or an electron-donating substance can be added to the electron-injecting material to thereby intensify the hole-injecting material or the electron-injecting material, respectively.
  • additional effective electron-injecting materials are a metal complex compound and a nitrogen-containing five-membered ring derivative.
  • Examples of the metal complex compound include, but not limited to, for example, 8-hydroxyquinolinato lithium, bis(8-hydroxyquinolinato)zinc, bis(8-hydroxyquinolinato)copper, bis(8-hydroxyquinolinato)manganese, tris(8-hydroxyquinolinato)aluminum, tris(2-methyl-8-hydroxyquinolinato)aluminum, tris(8-hydroxyquinolinato)gallium, bis(10-hydroxybenzo[h]quinolinato)beryllium, bis(10-hydroxybenzo[h]quinolinato)zinc, bis(2-methyl-8-quinolinato)chlorogallium, bis(2-methyl-8-quinolinato)(o-cresolato)gallium, bis(2-methyl-8-quinolinato)(1-naphtholato)aluminum, and bis(2-methyl-8-quinolinato)(2-naphtholato)gallium.
  • 8-hydroxyquinolinato lithium bis(8-hydroxyquinolinato)
  • Examples of the preferred nitrogen-containing five-membered derivative include, for example, an oxazole derivative, a thiazole derivative, an oxadiazole derivative, a thiadiazole derivative, and a triazole derivative.
  • Specific examples of the derivative include, but not limited to, 2,5-bis(1-phenyl)-1,3,4-oxazole, dimethylPOPOP, 2,5-bis(1-phenyl)-1,3,4-thiazole, 2,5-bis(1-phenyl)-1,3,4-oxadiazole, 2-(4′-tert-butylphenyl)-5-(4′′-biphenyl)-1,3,4-oxadiazole, 2,5-bis(1-naphthyl)-1,3,4-oxadiazole, 1,4-bis[2-(5-phenyloxadiazolyl)]benzene, 1,4-bis[2-(5-phenyloxadiazolyl)-4-tert-butyl
  • the organic EL device of the present invention in addition to the aromatic amine derivative, at least one kind of a light-emitting material, a doping material, a hole-injecting material, and an electron-injecting material may be incorporated into anyone of the organic thin film layers.
  • the surface of the organic EL device obtained according to the present invention can be provided with a protective layer, or the entire device can be protected with silicone oil, a resin, or the like with a view to improving the stability of the device against temperature, humidity, an atmosphere, or the like.
  • a conductive material having a work function larger than 4 eV is suitably used in the anode of the organic EL device of the present invention.
  • Examples of an available conductive material include: carbon, aluminum, vanadium, iron, cobalt, nickel, tungsten, silver, gold, platinum, and palladium, and alloys of them; metal oxides such as tin oxide and indium oxide to be used in an ITO substrate and an NESA substrate; and organic conductive resins such as polythiophene and polypyrrole.
  • a conductive substance having a work function smaller than 4 eV is suitably used in the cathode of the device.
  • Examples of an available conductive substance include, but not limited to, magnesium, calcium, tin, lead, titanium, yttrium, lithium, ruthenium, manganese, aluminum, and lithium fluoride, and alloys of them.
  • Representative examples of the alloys include, but not limited to, a magnesium/silver alloy, a magnesium/indium alloy, and a lithium/aluminum alloy.
  • a ratio between the components of an alloy is controlled depending on, for example, the temperature of a deposition source, an atmosphere, and the degree of vacuum, and is selected to be an appropriate ratio.
  • Each of the anode and the cathode may be formed of a layer constitution having two or more layers if needed.
  • At least one surface of the organic EL device of the present invention is desirably sufficiently transparent in the luminous wavelength region of the device so that the device can efficiently emit light.
  • a substrate is also desirably transparent.
  • a transparent electrode is formed by means of any one of the above conductive materials, and is set by means of a method such as deposition or sputtering in such a manner that desired translucency is secured.
  • the light transmittance of an electrode on a light-emitting surface is desirably 10% or more.
  • the substrate is not limited as long as it has mechanical strength, thermal strength, and transparency. Examples of the substrate include a glass substrate and a transparent resin film.
  • the transparent resin film examples include polyethylene, an ethylene-vinyl acetate copolymer, an ethylene-vinyl alcohol copolymer, polypropylene, polystyrene, polymethyl methacrylate, polyvinyl chloride, polyvinyl alcohol, polyvinyl butyral, nylon, polyether ether ketone, polysulfone, polyether sulfone, a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, polyvinyl fluoride, a tetrafluoroethylene-ethylene copolymer, a tetrafluoroethylene-hexafluoropropylene copolymer, polychlorotrifluoroethylene, polyvinylidene fluoride, polyester, polycarbonate, polyurethane, polyimide, polyetherimide, polyimide, and polypropylene.
  • each layer of the organic EL device is not particularly limited, but must be set to an appropriate thickness.
  • An excessively thick thickness requires an increased applied voltage for obtaining certain optical output, thereby resulting in poor efficiency.
  • An excessively thin thickness causes a pin hole or the like, so sufficient emission luminance cannot be obtained even when an electric field is applied.
  • the thickness is in the range of preferably 5 nm to 10 ⁇ m, or more preferably 10 nm to 0.2 ⁇ m.
  • a material of which each layer is formed is dissolved or dispersed into an appropriate solvent such as ethanol, chloroform, tetrahydrofuran, or dioxane, to thereby form a thin film.
  • an appropriate solvent such as ethanol, chloroform, tetrahydrofuran, or dioxane
  • any one of the above solvents may be used.
  • an appropriate resin or additive may be used in each of the organic thin film layers for, for example, improving film formability or preventing a pin hole in the layer.
  • Examples of an available resin include: insulating resins such as polystyrene, polycarbonate, polyallylate, polyester, polyamide, polyurethane, polysulfone, polymethyl methacrylate, polymethyl acrylate, and cellulose, and copolymers of them; photoconductive resins such as poly-N-vinylcarbazole and polysilane; and conductive resins such as polythiophene and polypyrrole.
  • the additive include an antioxidant, a UV (ultra violet) absorber, and a plasticizer.
  • the organic EL device of the present invention can find use in applications including: a flat luminous body such as the flat panel display of a wall hanging television; a light source for the backlight, meters, or the like of a copying machine, a printer, or a liquid crystal display; a display panel; and a signal lamp.
  • the material of the present invention can be used in not only the field of an organic EL device but also the fields of an electrophotographic photosensitive member, a photoelectric transfer element, a solar cell, and an image sensor.
  • Compound (2) was synthesized via the following reaction path.
  • the precipitated crystal was taken by filtration, and was washed with 50 mL of toluene and 100 mL of methanol, whereby 6.7 g of a pale yellow powder were obtained (80% yield).
  • the 1 H-NMR spectrum and FD-MS spectrum of the resultant compound were measured, whereby the compound was identified as Compound (5).
  • the 1 H-NMR spectrum (see FIG. 1 and Table 1) was measured with a DRX-500 (heavy methylene chloride solvent) manufactured by Brucker.
  • the maximum absorption wavelength and maximum fluorescent wavelength of the resultant compound measured in a toluene solution were 410 nm and 428 nm, respectively.
  • a transparent electrode composed of an indium tin oxide having a thickness of 130 nm was arranged on a glass substrate measuring 25 ⁇ 75 ⁇ 1.1 mm.
  • the glass substrate was subjected to ultrasonic cleaning in isopropyl alcohol, and was irradiated with ultraviolet light and ozone for cleaning.
  • the glass substrate equipped with the transparent electrode was mounted on a substrate holder in the deposition tank of a vacuum deposition device.
  • the degree of vacuum in a vacuum tank was reduced to 1 ⁇ 10 ⁇ 3 Pa.
  • a hole-injecting layer, a hole-transporting layer, a light-emitting layer, an electron-transporting layer, an electron-injecting layer, and a cathode layer were sequentially laminated on an anode (transparent electrode) layer under the following deposition conditions, whereby an organic EL device was produced.
  • Hole-injecting layer (material) N′,N′′-bis[4-(diphenylamino)phenyl]-N′,N′′-diphenylbiphenyl-4,4′-diamine; deposition condition 2 nm/sec; thickness 60 nm
  • Hole-transporting layer (material) the Compound (2); deposition condition 2 nm/sec; thickness 20 nm
  • Light-emitting layer 10-(4-(naphthylen-1-yl)phenyl)-9-(naphthylen-3-yl)anthracene as a host material; deposition condition 2 nm/sec and tetrakis(2-naphtyl)-4,4′-diaminostilbene as a dopant; deposition condition 0.2 nm/sec are simultaneously deposited from the vapor; thickness 40 nm (weight ratio between the host material and the dopant is 40:2)
  • Electron-transporting layer (material) tris(8-hydroxyquinolino)aluminum; deposition condition 2 nm/sec; thickness 20 nm
  • Electron-injecting layer (material) lithium fluoride; deposition condition 0.1 nm/sec; thickness 1 nm
  • Cathode layer (material) aluminum; deposition condition 2 nm/sec; thickness 200 nm
  • the resultant device was subjected to an energization test. As a result, it was confirmed that emission luminance was 500 cd/m 2 at a voltage of 6.5 V and a luminescent color was blue. In addition, when the device was driven at a constant current with initial emission luminance set to 500 cd/m 2 , a time period required for the luminance to reduce by 10% was 100 hours. Table 2 shows the obtained results. When the device was stored at 85° C. for 500 hours, no change in driving voltage was observed.
  • an organic EL device was produced in the same manner as in Example 1 except that a material described in Table 2 was used instead of Compound (2) as a material for hole-transporting layer.
  • Example 2 Each of the resultant devices was evaluated in the same manner as in Example 1. As a result, as shown in Table 2, blue light emission was observed in each of all the devices. In addition, emission luminance was 450 to 510 cd/m 2 , and a time period required for the luminance to reduce by 10% was 90 to 110 hours. When each of those devices was stored at 85° C. for 500 hours, no change in driving voltage was observed.
  • Organic EL devices were each produced in the same manner as in Example 1 except that any one of the following materials was used as a material for a hole transporting layer instead of Compound (2).
  • each of the resultant devices was evaluated in the same manner as in Example 1. As a result, as shown in Table 2, each of all the devices was observed to emit blue light, showed an emission luminance of 380 to 430 cd/m 2 , and had a time period required for the luminance to reduce by 10% of 50 to 60 hours. In addition, those devices were stored at 85° C. for 500 hours. As a result, the voltage at which each of the devices was driven changed by 1 V or more.
  • a transparent electrode composed of an indium tin oxide having a thickness of 130 nm was arranged on a glass substrate measuring 25 ⁇ 75 ⁇ 1.1 mm.
  • the glass substrate was subjected to ultrasonic cleaning in isopropyl alcohol, and was irradiated with ultraviolet light and ozone for cleaning.
  • the glass substrate equipped with the transparent electrode was mounted on a substrate holder in the deposition tank of a vacuum deposition device.
  • the degree of vacuum in a vacuum tank was reduced to 1 ⁇ 10 ⁇ 3 Pa.
  • a hole-injecting layer, a hole-transporting layer, a light-emitting layer, an electron-transporting layer, an electron-injecting layer, and a cathode layer were sequentially laminated on an anode (transparent electrode) layer under the following deposition conditions, whereby an organic EL device was produced.
  • Hole-injecting layer (material) N′,N′′-bis[4-(diphenylamino)phenyl]-N′,N′′-diphenylbiphenyl-4,4′-diamine; deposition condition 2 nm/sec; thickness 60 nm
  • Hole-transporting layer (material) N,N,N′,N′-tetrakis(4-biphenyl)-4,4′-benzidine; deposition condition 2 nm/sec; thickness 20 nm
  • Light-emitting layer 10-(4-(naphthylen-1-yl)phenyl)-9-(naphthylen-3-yl)anthracene as a host material; deposition condition 2 nm/sec and the above compound (31) as a dopant; deposition condition 0.1 nm/sec are simultaneously deposited from the vapor; thickness 40 nm (weight ratio between the host material and the dopant is 40:2)
  • Electron-transporting layer (material) tris(8-hydroxyquinolino)aluminum; deposition condition 2 nm/sec; thickness 20 nm
  • Electron-injecting layer (material) lithium fluoride; deposition condition 0.1 nm/sec; thickness 1 nm
  • Cathode layer (material) aluminum; deposition condition 2 nm/sec; thickness 200 nm
  • the resultant device was subjected to an energization test. As a result, it was confirmed that emission luminance was 900 cd/m 2 at a voltage of 6.5 V and a luminescent color was blue. In addition, when the device was driven at a constant current with initial emission luminance set to 2,000 cd/m 2 , a time period required for the luminance to reduce by 50% was 3,000 hours. When the device was stored at 85° C. for 500 hours, no change in driving voltage was observed.
  • An organic EL device was produced in the same manner as in Example 6 except that 1,6-bis(diphenylamino)pyrene was used as a material for a light emitting layer instead of Compound (31) in Example 6.
  • the resultant device was evaluated in the same manner as in Example 1. As a result, the device was observed to emit blue light, showed an emission luminance of 800 cd/m 2 , and had a time period required for the luminance to reduce by 50% as short as 500 hours. In addition, the device was stored at 85° C. for 500 hours. As a result, the voltage at which the device was driven showed no change.
  • the use of the aromatic amine derivative of the present invention as a dopant for a light-emitting layer significantly improves a half life.
  • each of the aromatic amine derivative of the present invention and the organic EL device using the derivative has high emission luminance, high heat resistance, excellent high-temperature storage stability, and a long lifetime. Therefore, each of them can be highly practically used in, for example, an on-vehicle device, and is useful.

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CN101142170A (zh) 2008-03-12
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