WO2005101913A1 - 有機エレクトロルミネッセンス素子 - Google Patents
有機エレクトロルミネッセンス素子 Download PDFInfo
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Definitions
- the present invention relates to an organic electroluminescent (EL) device, and more particularly, to an organic EL device having excellent heat resistance, a long lifetime, high luminous efficiency, and capable of obtaining green to red luminescence. is there.
- EL organic electroluminescent
- An organic EL device is a self-luminous device that utilizes the principle that a fluorescent substance emits light by the recombination energy of holes injected from an anode and electrons injected from a cathode when an electric field is applied. .
- the element structure of the organic EL element is a two-layer type including a hole transport (injection) layer and an electron transport / emission layer, or a hole transport (injection) layer, an emission layer, and an electron transport (injection) layer.
- the three-layer structure is well known. In such a stacked structure element, various measures have been taken on the element structure and the forming method in order to increase the recombination efficiency of injected holes and electrons.
- chelate complexes such as tris (8-quinolinol) aluminum complex, coumarin complexes, tetraphenylbutadiene derivatives, bisstyrylarylene monolen derivatives, oxadiazole derivatives and the like are known.
- a full-color display requires three primary colors (blue, green, and red). In particular, highly efficient green and red (and even pure red) elements are required.
- Patent Document 4 discloses a device using an aminoanthracene derivative as a green light-emitting material.
- the glass transition temperature is low
- the heat resistance of the organic EL device using the material is low
- a long life and high efficiency light emission cannot be obtained.
- Patent Document 5 discloses a red light-emitting element in which a naphthacene or pentacene derivative is added to a light-emitting layer. This light-emitting element has an excellent red purity, but has a high applied voltage of 11 V and a half reduction in luminance. The service life was inadequate at 1500 hours.
- Patent Document 6 discloses a red light-emitting device in which an amine-based aromatic compound is added to a light-emitting layer, and the light-emitting device has a color purity of CIE chromaticity (0.64, 0.33). However, the driving voltage was as high as 10 V or more.
- Patent Document 7 discloses a device in which an azafluoranthene conjugate is added to a light-emitting layer. The device emits light from yellow to green, and does not emit sufficient red light.
- Patent Document 8 discloses a green light-emitting device using an anthracene derivative and an arylamine derivative in a light-emitting layer.
- Patent Document 9 discloses a green light-emitting device in which a styrylnaphthacene derivative is added to a light-emitting layer.
- the light-emitting efficiency is about 13 cdZA, and further improvement in efficiency is desired.
- Patent Literatures 10 and 11 disclose light-emitting elements in which a naphthacene derivative is added to a light-emitting layer. The light-emitting element emits orange light and emits sufficient red light.
- Patent Document 1 JP-A-8-239655
- Patent Document 2 Japanese Patent Application Laid-Open No. 7-138561
- Patent Document 3 JP-A-3-200289
- Patent Document 4 Japanese Patent Application Laid-Open No. 2001-207167
- Patent Document 5 Japanese Patent Application Laid-Open No. 08-311442
- Patent Document 6 JP 2001-81451 A
- Patent Document 7 JP 2001-160489
- Patent Document 8 International Publication WO2004Z018588
- Patent Document 9 JP-A-2000-268963
- Patent Document 10 JP-A-2000-26334
- Patent Document 11 JP-A-2000-26337
- the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an organic EL device which has excellent heat resistance, has a long life, has high luminous efficiency, and can emit green to pure red light.
- the purpose is.
- the organic luminescent medium layer contains an arylamine conjugate and a condensed ring having a specific structure represented by the following general formula (I). It has been found that the above objects can be achieved by incorporating the compound in combination, and the present invention has been completed.
- the present invention relates to an organic EL device having a pair of electrodes and an organic light emitting medium layer sandwiched between these electrodes, wherein the organic light emitting medium layer has a substituent (A). At least one selected from arylamine conjugates having a good carbon number of 10 to 100, and (B) the following general formula (I)
- Ar is an aromatic hydrocarbon group having 6 to 30 carbon atoms which may have a substituent, or
- Having a substituent may represent an aromatic heterocyclic group having 3 to 30 carbon atoms, a is an integer of 2 to 6, and a plurality of Ar 1 may be the same or different, and L is Represents an a-valent residue of a condensed polycyclic aromatic ring having 4 to 10 rings which may have a substituent.
- the organic EL device of the present invention has excellent heat resistance, a long life, high luminous efficiency, green to pure Red light emission is obtained.
- the organic EL device of the present invention is an organic EL device having a pair of electrodes and an organic light emitting medium layer sandwiched between these electrodes, wherein the organic light emitting medium layer has a substituent (A). May have at least 10 carbon atoms: at least one selected from the group consisting of an arylamine compound of LOO and (B) the following general formula (I)
- Ar is an aromatic hydrocarbon group having 6 to 30 carbon atoms which may have a substituent, or
- Having a substituent may represent an aromatic heterocyclic group having 3 to 30 carbon atoms, a is an integer of 2 to 6, and a plurality of Ar 1 may be the same or different, and L is Represents an a-valent residue of a condensed polycyclic aromatic ring having 4 to 10 rings which may have a substituent. )) And at least one compound selected from the condensed ring-containing compounds represented by
- the arylamine conjugate as the component (A) preferably has 30 to 100 carbon atoms.
- the arylamine conjugate as the component (A) is represented by, for example, the following general formula (II). And arylamine conjugates.
- X is a condensed aromatic ring group having 10 to 40 nuclear carbon atoms which may have a substituent
- Ar And Ar are each independently a carbon atom having 6
- examples of the condensed aromatic ring group for X include naphthalene, phenanthrene, fluoranthene, anthracene, pyrene, perylene, coronene, talycene, picene, diphenylanthracene, fluorene and triphene.
- Examples of the group include a phenyl group, a naphthyl group, an anthral group, a phenanthryl group, a pyrenyl group, a phenol group, a biphenyl group, a terphenyl group, a fluoryl group, and a fulleryl group.
- Groups, a chelyl group, a benzochel group, an indolyl group, a carbazolyl group, a furyl group, a pyrrolyl group, a pyridyl group and the like, and a phenyl group, a naphthyl group, a pyrenyl group and a biphenyl group are preferred.
- arylamine conjugates represented by the general formula (II) can be preferably exemplified.
- a to A each independently represent a hydrogen atom
- alkyl group which may have a substituent of A to A include a methyl group and an ethyl group
- Examples of the aralkyl group which may have a substituent of A to A include a benzyl group,
- 2- ⁇ naphthylethyl group 1- ⁇ naphthylisopropyl group, 2- ⁇ naphthylisopropyl group, 1 pyrrolylmethyl group, 2- (1 pyrrolyl) ethyl group, ⁇ methylbenzyl group, m-methylbenzyl group, o-methylbenzyl group, p-chlorobenzyl, m-chlorobenzyl, o-chlorobenzyl, p-bromobenzyl, m-bromobenzyl, o-bromobenzyl, p-benzyl, m-benzyl, o-benzyl , P-hydroxybenzyl group, m-hydroxybenzyl group, o-hydroxybenzyl group, p-aminobenzyl group, m-aminobenzyl group, o aminobenzyl group, p-nitrobenzyl group, m--torobenzyl group, o -Trob
- Examples of the cycloalkyl group which may have a substituent of A to A include, for example, cyclopropyl
- a pill group a cyclobutyl group, a cyclopentyl group, a cyclohexyl group and the like.
- alkoxyl group which may have a substituent A to A include, for example, a methoxy group
- Examples include an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, an isobutoxy group, a sec-butoxy group, a tert-butoxy group, various pentyloxy groups, and various hexyloxy groups.
- Examples thereof include a silyl group, a tolyloxy group, and a naphthyloxy group.
- Examples include an amino group, a ditolylamino group, a dinaphthylamino group, a naphthylphenylamino group and the like.
- Examples of the alkylamino group optionally having a substituent of A to A include, for example, dimethyl
- Examples include an amino group, a getylamino group, a dihexylamino group and the like.
- c, d, e and f each represent an integer of 0 to 5, and preferably 0 to 2.
- c, d, e, and f are 2 or more, a plurality of A to A
- g shows the integer of 0-4.
- V is a secondary or tertiary alkyl group having 3 to 10 carbon atoms.
- Examples of the secondary or tertiary alkyl group include secondary and tertiary alkyl groups described in the above A to A.
- At least one of c, d, e, and f is an integer of 2 or more.
- the arylamine conjugate represented by the general formula (II) is more preferably an arylamine conjugate represented by the following general formulas (IIb) and (IIb ').
- A may be the same or different, and
- R and R are each independently a hydrogen atom
- an alkyl group of L0 (preferably having 1 to 6 carbon atoms), having a substituent! / May have a carbon number of 6 to
- An aromatic hydrocarbon group having 20 preferably 6 to 14 carbon atoms
- an aralkyl group having 7 to 50 (preferably 7 to 40 carbon atoms) which may have a substituent
- An alkoxyl group having 1 to 50 carbon atoms (preferably 1 to 6 carbon atoms), and 5 to 50 carbon atoms optionally having a substituent (preferably 5 to 18 carbon atoms) )
- h and i each represent an integer of 0 to 2.
- at least one of A to A has a substituent.
- V is a secondary or tertiary alkyl group having 3 to 10 carbon atoms.
- At least one of c, d, e, and f is an integer of 2 or more.
- the arylamine compound of the component (A) may be used alone or in combination of two or more.
- Alkyl groups having 1 to 6 carbon atoms cycloalkyl groups having 3 to 6 carbon atoms, alkoxyl groups having 1 to 6 carbon atoms, aryloxy groups having 5 to 18 carbon atoms, aralkyloxy groups having 7 to 18 carbon atoms, Examples thereof include an arylamino group having 5 to 16 carbon atoms, a nitro group, a cyano group, an ester group having 1 to 6 carbon atoms, and a halogen atom.
- Examples include a monocyclic or polycyclic aromatic hydrocarbon group which may be any of hydrogen groups, including condensed rings and ring assemblies, such as a phenyl group, an alkylphenyl group, and an alkoxyphenyl group.
- (Arylalkyl) force may be an induced arylalkyl group.
- aromatic heterocyclic group for Ar those containing 0, N, and S as hetero atoms are preferable.
- the sign may be a five-membered or six-membered ring. Specific examples include a cherry group, a furyl group, a pyrrolyl group, and a pyridyl group.
- examples of the substituent of the aromatic hydrocarbon group and the aromatic heterocyclic group include an alkyl group, an alkoxy group, an aryl group, an aryloxy group, an amino group, and a heterocyclic group.
- Ar is particularly preferably an aromatic hydrocarbon group, particularly a phenyl group or an alkyl phenyl group.
- the alkylphenol group is preferably an alkyl group having 1 to 10 carbon atoms, and the alkyl group may be a straight-chain or branched alkyl group such as methyl group, ethyl group, (n , i) -propynole, (n, i, sec, tert) -butynole, (n, i, neo, tert) -pentyl and (n, i, neo) -hexyl
- the substitution position of these alkyl groups in the phenol group may be any of the o, m, and p positions. Specific examples of such an alkylphenyl group include an (o, m, p) tolyl group, a 4 n-butylphenyl group, a 4 t-butylphenyl group and the like.
- an aryl group preferably is a phenyl group or a naphthyl group. Such a phenyl group or a naphthyl group may be substituted, and the substituent in this case is an alkyl group. Specific preferred examples include the alkyl groups exemplified above for the alkylphenol group. Further, the aryl group may be a phenyl group substituted with an aryl group such as a phenyl group. Specific examples of such arylyl groups include (o, m, p) -biphenyl-group, 4-triphenyl-group, 3-tolylphenyl-group, and tert-phenyl-group. And a rephenyl group.
- the alkenyl group is preferably an alkenyl group having 2 to 20 carbon atoms, and more preferably a triarylalkenyl group, for example, a triphenylvinyl group, a tolylvinyl group, And a tribiphenyl group.
- a triarylalkenyl group for example, a triphenylvinyl group, a tolylvinyl group, And a tribiphenyl group.
- alkenylphenyl group include a triphenylvinylphenyl group.
- the aminophenyl group is preferably a diamino group in which the amino group is a diarylamino group.
- the arylamino group include a diphenylamino group and a phenolylamino group.
- Specific examples of such an aminophenol group include a diphenylaminophenol group, a phenolylaminophenol group, and the like.
- Examples of the naphthyl group include a 1-naphthyl group and a 2-naphthyl group.
- arylalkyl group those having 8 to 20 carbon atoms are preferable, such as a ferruetur group, a triluetur group, a biphenyl-ryletul group, a naphthyletur group, a diphenylaminophenol group, and a N-phenylamino group.
- ferruetur group a triluetur group
- biphenyl-ryletul group a naphthyletur group
- a diphenylaminophenol group and a N-phenylamino group.
- L in the general formula (I) represents a divalent to hexavalent residue of a fused polycyclic aromatic ring having 4 to 10, preferably 4 to 6, rings.
- the condensed polycyclic aromatic ring include a condensed polycyclic aromatic hydrocarbon ring and a condensed polycyclic aromatic heterocyclic ring.
- condensed polycyclic aromatic hydrocarbon ring examples include benzanthracene, naphthacene, pyrene, thalicene, triphenylene, benzo [c] phenanthrene, benzo [a] anthracene, pentacene, perylene, dibenzo [a, j] anthracene, Examples thereof include dibenzo [a, h] anthracene, benzo [a] naphthacene, hexacene, and anthantrene, and preferred are benzanthracene, naphthacene, pentacene, and hexacene.
- condensed polycyclic aromatic heterocycle examples include naphtho [2, l-f] isoquinoline, ⁇ -naphthaphenanthridine, phenanthrooxazole, quinolino [6,5-f] quinoline, benzo [b] thiophenanthrene, and benzo. [g] thiophanthrene, benzo [i] thiophanthrene, benzo [b] thiophan anthraquinone and the like.
- the divalent to hexavalent residue of the condensed polycyclic aromatic ring represented by L may further have a substituent, but is preferably unsubstituted.
- L is a divalent to hexavalent, particularly divalent to tetravalent residue in which a benzene ring is linearly condensed and is derived from naphthacene, pentacene or hexacene.
- L is a tetravalent residue derived from naphthacene, that is, a 5,6,11,12-naphthacene-tetrayl group, four Ar atoms are not simultaneously a phenyl group.
- the compound having an Ar 1S substituent I is an aromatic hydrocarbon group having 6 to 30 carbon atoms, a is an integer of 2 to 4, L is a substituent, and may have 4 or more rings. It preferably represents a divalent to tetravalent residue of a cyclic aromatic ring.
- the ratio of the arylamine conjugate of the component (A) to the condensed ring-containing conjugate of the component (B) in the organic light emitting medium layer is 1:99 by weight. It is advantageous to appropriately select from the range of ⁇ 99: 1 according to the kind of the compound to be used and the like. In particular, considering that the component (A) compound has a hole-transporting property, while the component (B) compound has an electron-transporting property, it is selected so that the life and efficiency of the obtained device are the best. It is desirable.
- the preferred ratio of the component (A) to the component (B) is in the range of 1:99 to 20:80 by weight, and particularly high efficiency can be obtained in this range.
- the thickness of the organic luminescent medium layer is preferably in the range of 5 to 200 nm, and particularly in the range of 10 to 40 nm, since the applied voltage of the device can be extremely low.
- the efficiency is increased by about 3 to 5 times as compared with the case of using the component (B) alone.
- the service life can be at least three times longer and, if optimized, more than ten times longer.
- arylamine conjugates represented by the general formula (II) as the component (A) particularly arylamine conjugates in which a branched alkyl group or a plurality of substituents are introduced into an amino substituent or a condensed aromatic ring.
- the fused ring-containing compound represented by the general formula (I) used as the component (B) is a luminescent material that emits a longer wavelength than the anthracene derivative or the bisanthracene derivative. Energy transfer from the ring-containing conjugate to the arylamine conjugate is advantageous in obtaining a green to red light-emitting device, and can achieve higher luminous efficiency.
- the emission colors of green to pure red in the organic EL device of the present invention can be classified by the maximum emission wavelength of the emission spectrum, green (maximum emission wavelength: 500 to 530 nm), yellow (maximum emission wavelength: 530 to 585 nm), It is orange (585 to 595 nm), red (maximum emission wavelength: 595 to 620 nm), and pure red (maximum emission wavelength: 620 to 700 nm).
- the organic light emitting medium layer becomes more amorphous, the stability is improved, and the heat resistance is excellent.
- the component (B) compound a compound having a glass transition point of 110 ° C. or higher is preferable, while as the component (A), a compound having a glass transition point of 70 ° C. or higher is preferable.
- the glass transition point of the organic light emitting medium layer can be increased to 90 ° C or higher by mixing the conjugate having such a glass transition point, and the glass transition point can be adjusted to 85 ° C for 500 hours or more. It is possible to obtain storage heat resistance of more than 1000 hours at ° C.
- an organic light-emitting medium layer (hereinafter, abbreviated as light-emitting medium layer) containing a combination of the above-mentioned component (A) and component (B) is sandwiched between a pair of electrodes. Also, it is preferable to interpose various intermediate layers between the electrode and the luminescent medium layer. Examples of the intermediate layer include a hole injection layer, a hole transport layer, an electron injection layer, and an electron transport layer. Various organic and inorganic compounds are known.
- a typical device configuration of such an organic EL device is as follows.
- the force of which the configuration (8) is usually preferably used is usually preferably used
- the present invention is not limited to these.
- the organic EL device is usually manufactured on a light-transmitting substrate.
- This light-transmitting substrate is a substrate that supports the organic EL element, and a light-transmitting substrate having a transmittance of 50% or more in the visible region of 400 to 700 nm is desired to be a smoother substrate. It is preferable to use it.
- a glass plate, a synthetic resin plate, or the like is suitably used as such a light-transmitting substrate.
- the glass plate include plates formed of soda-lime glass, norium-strontium-containing glass, lead glass, aluminosilicate glass, borosilicate glass, norium borosilicate glass, quartz, and the like.
- the synthetic resin plate is made of polycarbonate resin. Or acrylic resin, polyethylene terephthalate resin, polyether sulfide resin, polysulfone resin or the like.
- anode those having a work function of! / (4 eV or more), a metal, an alloy, an electrically conductive compound, or a mixture thereof as an electrode material are preferably used.
- electrode materials include metals such as Au, Cul, ITO (indium tin oxide), SnO,
- Conductive materials such as ZnO and In—Zn—O are exemplified.
- a thin film can be formed from these electrode substances by a method such as an evaporation method or a sputtering method.
- This anode desirably has such a characteristic that when the light emitted from the light emitting layer is also taken out of the anode, the transmittance of the anode to the light emission is greater than 10%.
- the sheet resistance of the anode is preferably several hundred ⁇ / square or less.
- the thickness of the anode depends on the material, but is usually selected in the range of 10 nm to 1 ⁇ m, preferably 10 to 200 nm.
- a metal, an alloy, an electrically conductive compound, or a mixture thereof having an electrode material that has a small work function! / ⁇ (4 eV or less) is used as the cathode.
- electrode materials include sodium, sodium-potassium alloy, magnesium, lithium, magnesium 'silver alloy, aluminum Z aluminum oxide, AlZLi 20, Al / LiO 2, Al / LiF, aluminum- ⁇ . • Lithium alloy, indium, rare earth metal, etc.
- the cathode can be manufactured by forming a thin film from these electrode substances by a method such as evaporation or sputtering.
- the transmittance of the light emitted from the cathode be greater than 10%.
- the sheet resistance as the cathode is preferably several hundred ⁇ / square or less, and the film thickness is usually ⁇ ! 11 ⁇ m, preferably 50-200 nm.
- the organic EL device of the present invention at least one of the chalcogenide layer, the metal halide layer and the metal oxide layer is formed on at least one surface of the pair of electrodes thus produced.
- these may be referred to as surface layers.
- a chalcogenide (including oxide) layer of a metal such as silicon or aluminum is provided on the anode surface on the light emitting medium layer side, and a halogenated metal layer or metal oxide is provided on the cathode surface on the light emitting medium layer side. It is good to arrange a dashi thing layer. In this way, driving stability can be achieved. Can do.
- the chalcogenide for example, SiOx (l ⁇ X ⁇ 2), A10x (l ⁇ X ⁇ 1.5), SiON, SiAlON and the like are preferable, and as the metal halide, for example, LiF, MgF,
- CaF, rare earth metal fluoride and the like are preferably exemplified, and as the metal oxide, for example, Cs
- both the electron transporting property and the hole transporting property of the light emitting medium layer are improved by the use ratio of the component (A) and the component (B). It is possible to omit the intermediate layers such as the hole injection layer, the hole transport layer, and the electron injection layer. In this case, the surface layer can be provided even if it is preferable.
- a mixed region of an electron transfer compound and a reducing dopant or a hole transfer compound and an oxide film are formed on at least one surface of the pair of electrodes thus manufactured. It is also preferable to arrange a mixed region of the ionic dopant. By doing so, the electron transfer compound is reduced to an anion, and the mixed region is more likely to inject and transfer electrons to the luminescent medium. In addition, the hole transport compound is oxidized and becomes a cation, and the mixed region is more likely to inject and transport holes into the luminescent medium.
- Preferred Lewis acid dopants include various Lewis acid acceptor compounds.
- Preferred reducing dopants include alkali metals, alkali metal compounds, alkaline earth metals, rare earth metals, and these compounds.
- the light emitting medium layer In the organic EL device of the present invention, the light emitting medium layer
- Injection function a function that can inject holes from the anode or hole injection layer and apply electrons from the cathode or electron injection layer when applying an electric field.
- the luminescent medium layer is particularly preferably a molecular deposition film.
- the molecular deposition film is a thin film formed by deposition from a material compound in a gaseous phase or a film formed by solidification from a material compound in a solution or liquid phase.
- this molecular deposited film can be distinguished from the thin film (molecule accumulation film) formed by the LB method by the difference in the aggregated structure, the higher-order structure, and the functional difference caused by it.
- a binder such as resin and a material compound are dissolved in a solvent to form a solution, which is then subjected to a spin coating method or the like.
- the light-emitting medium layer can also be formed by thin film formation.
- the light-emitting medium layer may contain a known organic light-emitting medium other than the components (A) and (B), if desired, as long as the object of the present invention is not impaired. Further, a light emitting medium layer containing another known organic light emitting medium may be laminated on the light emitting medium layer containing the compound according to the present invention.
- the hole injection / transport layer is a layer that assists hole injection into the light emitting medium layer and transports it to the light emitting region. 5 eV or less and small.
- a material that transports holes to the light emitting medium layer with a lower electric field strength is preferable.
- a hole mobility force of, for example, 10 4 to 10 6 V / cm electric field is applied. sometimes, those of at least 10- 6 cm 2 ZV 'seconds is preferred.
- any one of conventionally known materials commonly used as a hole charge transporting material in a photoconductive material and a known material used for a hole injection layer of an organic EL device can be used. You can select and use one.
- the hole injecting and transporting material may be thinned by a known method such as a vacuum evaporation method, a spin coating method, a casting method, and an LB method.
- a known method such as a vacuum evaporation method, a spin coating method, a casting method, and an LB method.
- the thickness of the hole injection / transport layer is not particularly limited, but is usually 5 ⁇ ! &) At ⁇ 5 ⁇ m.
- the electron injection layer 'transport layer is a layer that assists the injection of electrons into the light emitting medium layer and transports it to the light emitting region.
- the layer has particularly good adhesion to the cathode and has a high material strength.
- a metal complex of 8-hydroxyquinoline or a derivative thereof is preferable.
- Specific examples of the metal complex of 8-hydroxyquinoline or a derivative thereof include a metal chelate oxinoid containing a chelate of oxine (generally, 8-quinolinol or 8-hydroxyquinoline).
- a compound, for example, tris (8-quinolinol) aluminum can be used as an electron injection material.
- an insulating thin film layer may be inserted between the pair of electrodes.
- Materials used for the insulating layer include, for example, aluminum oxide, lithium fluoride, lithium oxide, calcium fluorescein, calcium oxalate, magnesium oxalate, magnesium fluoride, magnesium oxide, calcium sulfide, and calcium fluoride.
- Examples include calcium oxide, aluminum nitride, titanium oxide, silicon oxide, germanium oxide, silicon nitride, boron nitride, molybdenum oxide, ruthenium oxide, and vanadium oxide. These mixtures and laminates may be used.
- an anode, a luminescent medium layer, a hole injection layer if necessary, and an electron injection layer if necessary are formed by the materials and methods described above.
- the cathode may be formed.
- an organic EL device can be manufactured from the cathode to the anode in the reverse order.
- an example of manufacturing an organic EL element having a configuration in which an anode Z, a hole injection layer, a light-emitting medium layer, an electron injection layer, and a cathode are sequentially provided on a light-transmitting substrate will be described.
- a thin film made of an anode material is formed on a suitable translucent substrate by a vapor deposition method or a sputtering method so as to have a thickness of 1 ⁇ m or less, preferably in a range of 10 to 200 nm.
- a hole injection layer is provided on the anode.
- the hole injection layer can be formed by a vacuum deposition method, a spin coating method, a casting method, an LB method, or the like, but as soon as a uniform film is obtained, pinholes are generated. It is preferable to form the film by a vacuum vapor deposition method such as a difficulty.
- the deposition conditions vary depending on the compound used (the material of the hole injection layer), the crystal structure and the recombination structure of the target hole injection layer, etc.
- a light emitting medium layer is provided on the hole injection layer.
- This light-emitting medium layer is also formed using the organic light-emitting medium according to the present invention by vacuum evaporation, sputtering, spin coating, and casting.
- the organic light-emitting medium can be formed by thinning the organic light-emitting medium by a method such as a thin film method.
- the evaporation conditions vary depending on the compound used, but can be generally selected from the same condition range as the formation of the hole injection layer.
- the thickness is preferably in the range of 10 to 40 nm.
- an electron injection layer is provided on the light emitting medium layer.
- a vacuum evaporation method like the hole injection layer and the light emitting medium layer, it is preferable to form the film by a vacuum evaporation method because it is necessary to obtain a uniform film.
- the vapor deposition conditions can be selected in the same condition range as the hole injection layer and the light emitting medium layer.
- an organic EL element can be obtained by laminating a cathode.
- the cathode also has a metallic force, and can be formed by a vapor deposition method or sputtering. However, in order to protect the underlying organic layer from damage during film formation, a vacuum deposition method is preferred.
- the production from the anode to the cathode is performed consistently by one evacuation.
- a transparent electrode of indium tin oxide with a thickness of 120 nm was provided on a glass substrate of 25 ⁇ 75 ⁇ 1.1 mm size. This glass substrate was subjected to ultrasonic cleaning in isopropyl alcohol for 5 minutes, followed by UV ozone cleaning for 30 minutes, and the substrate was set in a vacuum evaporation apparatus.
- ⁇ ', ⁇ "-bis [4 (diphenylamino) phenol] - ⁇ ', ⁇ " diphenyl-biphenyl-4,4, diamine was first used as a hole injection layer to a thickness of 60 nm.
- N, -bis [4 '- ⁇ N- (naphthyl-1-yl) -N-phenyl ⁇ aminobiphenyl 4-yl] N-phenylamine as a hole transport layer thereon Evaporated to a thickness of 20 nm.
- the above compounds (B) -7 and (A) -9 were co-evaporated at a weight ratio of 40: 3, and were evaporated to a thickness of 40 nm.
- tris (8-hydroxyquinolinato) aluminum was deposited to a thickness of 20 nm as an electron injection layer.
- Lithium fluoride was then deposited to a thickness of 0.3 nm, followed by aluminum to a thickness of 15 Onm. This aluminum lithium lithium fluoride acts as a cathode.
- an organic EL device was manufactured.
- a green light-emitting device having high luminous efficiency and long life was obtained.
- this device was stored at 85 ° C for 1000 hours and subjected to a current test, no change in light emission luminance was observed.
- An organic EL device was fabricated in the same manner as in Example 1, except that (A) -1 was used instead of compound (A) -9 when forming the light emitting layer.
- An organic EL device was fabricated in the same manner as in Example 1, except that (A) -20 was used instead of compound (A) -9 when forming the light emitting layer.
- the organic EL was prepared in the same manner as in Example 1, except that (B) -18 and (A) -10 were used instead of the compounds) -7 and (A) -9 when forming the light emitting layer.
- An element was manufactured.
- green light emission having a luminance of 1500 cd / m 2 was obtained at a voltage of 6.5 V and a current density of lOmAZcm 2 .
- a continuous DC conduction test was performed at an initial luminance of 5000 cd / m 2 , the half-life was 1250 hours.
- the device was stored at 85 ° C. for 1000 hours and subjected to an electric current test, no change in light emission luminance was observed.
- the organic EL was prepared in the same manner as in Example 1, except that (B) -9 and (A) -27 were used instead of the compounds) -7 and (A) -9 when forming the light emitting layer. An element was manufactured.
- Example 1 when forming the light emitting layer, instead of the compounds) -7 and (A) -9, (B) -8 and (A) -35 were used for simultaneous vapor deposition at a weight ratio of 40:10, An organic EL device was manufactured in the same manner except that the organic EL device was formed with a thickness of 40 nm.
- red light emission having a light emission luminance of 690 cd / m 2 was obtained at a voltage of 8.0 V and a current density of lOmAZcm 2 .
- a continuous DC conduction test was performed at an initial luminance of 3000 cd / m 2 , the half-life was 2900 hours.
- the device was stored at 85 ° C. for 1000 hours and subjected to an electric current test, no change in light emission luminance was observed.
- An organic EL device was fabricated in the same manner as in Example 6, except that (A) -39 was used instead of compound (A) -35 when forming the light emitting layer.
- the organic EL was prepared in the same manner as in Example 6, except that (B) -11 and (A) -40 were used instead of the compounds) -8 and (A) -35 when forming the light emitting layer.
- An element was manufactured.
- pure red light emission having a light emission luminance of 350 cdZm 2 was obtained at a voltage of 8.0 V and a current density of lOmAZcm 2 .
- a continuous DC conduction test was performed at an initial luminance of 3000 cdZm 2 , the half life was 1000 hours.
- this device was stored at 85 ° C for 1 000 hours and subjected to a current test, no change in light emission luminance was observed.
- Example 6 when forming the light-emitting layer, instead of the compounds) -8 and (A) -35, (B) -9 and 3,11-bis (diphenylamino) -1,7,14 diphenyl-nasenaf
- An organic EL device was manufactured in the same manner except that one [1, 2 — k] -fluoranthene was used.
- a current test was performed on this device, yellow luminescence with a voltage of 8.0 V and a current density of 10 OcmAZcm 2 115115 Ocd / m 2 was obtained.
- a continuous DC conduction test was performed with an initial luminance of 5000 cdZm 2 , the half-life was as short as 1050 hours.
- this device was stored at 85 ° C for 1000 hours and subjected to a current-carrying test, no change in emission luminance was observed.
- An organic EL device was fabricated in the same manner as in Example 1, except that the compound (7) was formed to have a thickness of 40 nm instead of the compound (7) and the compound (A) -9 when forming the light emitting layer. .
- Example 1 when forming the light emitting layer, instead of the compounds) 7 and (A) -9, An organic EL device was fabricated in the same manner as above except that tris (8-quinolinol) aluminum and the following compound C545T were co-deposited at a weight ratio of 40: 0.5 and formed to a thickness of 40 nm.
- an electric current test was performed on the obtained device, green light emission with a luminance of 1000 cd / m 2 was obtained at a voltage of 6.5 V and a current density of lOmAZcm 2 .
- a continuous DC conduction test was performed at an initial luminance of 5000 cd / m 2 , the half-life was as short as 780 hours.
- red light emission having a luminance of 150 cdZm 2 was obtained at a voltage of 6.5 V and a current density of lOmAZcm 2 .
- a continuous DC conduction test was performed at an initial luminance of 3000 cdZm 2 , the half-life was as short as 200 hours.
- Example 6 when forming the light emitting layer, instead of the compounds) -8 and (A) -35, instead of 10,10,1-bis [1,1 ', 4', 1 "] teru-ru 2-
- An organic EL device was fabricated in the same manner as above except that the virue 9, 9, 1-bianthracel and (A) -39 were used.
- the organic EL device of the present invention has excellent heat resistance, long life, high luminous efficiency, and can emit green to pure red light. Therefore, it is useful as a practical organic EL element, and is particularly suitable for a full-color display.
Abstract
Description
Claims
Priority Applications (2)
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EP05728719A EP1737277A4 (en) | 2004-04-15 | 2005-04-08 | ORGANIC ELECTROLUMINESCENCE DEVICE |
US11/547,233 US20070202354A1 (en) | 2004-04-15 | 2005-04-08 | Organic Electroluminescent Device |
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JP2004-120823 | 2004-04-15 | ||
JP2004120823A JP2005302667A (ja) | 2004-04-15 | 2004-04-15 | 有機エレクトロルミネッセンス素子 |
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US (1) | US20070202354A1 (ja) |
EP (1) | EP1737277A4 (ja) |
JP (1) | JP2005302667A (ja) |
KR (1) | KR20070004843A (ja) |
CN (1) | CN1943278A (ja) |
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JP2009218568A (ja) * | 2008-02-14 | 2009-09-24 | Yamagata Promotional Organization For Industrial Technology | 有機発光素子 |
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JP2004087363A (ja) * | 2002-08-28 | 2004-03-18 | Canon Inc | 有機発光素子 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2009218568A (ja) * | 2008-02-14 | 2009-09-24 | Yamagata Promotional Organization For Industrial Technology | 有機発光素子 |
JP4675413B2 (ja) * | 2008-02-14 | 2011-04-20 | 財団法人山形県産業技術振興機構 | 有機発光素子 |
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Publication number | Publication date |
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EP1737277A1 (en) | 2006-12-27 |
TW200541394A (en) | 2005-12-16 |
CN1943278A (zh) | 2007-04-04 |
KR20070004843A (ko) | 2007-01-09 |
US20070202354A1 (en) | 2007-08-30 |
EP1737277A4 (en) | 2008-08-20 |
JP2005302667A (ja) | 2005-10-27 |
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