WO2013035490A1 - 有機エレクトロルミネッセンス素子、照明装置及び表示装置 - Google Patents
有機エレクトロルミネッセンス素子、照明装置及び表示装置 Download PDFInfo
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- WO2013035490A1 WO2013035490A1 PCT/JP2012/070499 JP2012070499W WO2013035490A1 WO 2013035490 A1 WO2013035490 A1 WO 2013035490A1 JP 2012070499 W JP2012070499 W JP 2012070499W WO 2013035490 A1 WO2013035490 A1 WO 2013035490A1
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- 238000007738 vacuum evaporation Methods 0.000 description 1
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- C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
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- H10K85/346—Transition metal complexes, e.g. Ru(II)polypyridine complexes comprising platinum
Definitions
- the present invention relates to an organic electroluminescence element applied to various displays, display devices, illumination, and the like, and a display device and illumination device using the same.
- an organic electroluminescence element (hereinafter also referred to as an organic EL element) that emits light using electric energy from positive and negative electrodes using an organic material has a low voltage of about several V to several tens V. In particular, it has been attracting attention in recent years because it is a thin-film type complete solid-state device and saves space.
- organic EL elements In order to increase the efficiency of organic EL elements, it is essential to improve the light extraction efficiency.
- organic EL elements have a distance of about several tens of nanometers between the light emitting layer and the metal electrode, the waveguide loss of surface plasmon mode light is low. It has a problem that it is large and the light extraction efficiency does not increase.
- As a means for reducing the waveguide loss of surface plasmon mode light it is known to adopt a top emission type configuration in which the anode is a reflection electrode.
- the cathode of the top emission type organic EL element As the cathode of the top emission type organic EL element, a film obtained by thinning a metal to such an extent that the conductivity is not impaired is used. However, if the metal thin film has a sufficient conductivity, the transmittance of the cathode is lowered, and the extraction efficiency of light emitted inside is reduced. In addition, the light that has entered the cathode at a certain angle is more strongly reflected at the interface between the cathode and the organic layer, and there is a problem that the luminance varies greatly depending on the viewing angle of the light emitting element.
- Patent Document 1 studies have been made to improve the light extraction efficiency using optical interference.
- the improvement of the light extraction efficiency using optical interference is the film thickness of the light emitting layer, the distance between the reflective electrode and the semi-transmissive electrode. It was difficult to achieve compatibility with various performances such as voltage and life.
- Patent Document 2 it has been studied to improve the light extraction efficiency by providing a light scattering layer outside the transmissive electrode, but optical loss due to backscattering in the light scattering layer is unavoidable, It has been found that the double-sided emission type organic EL illumination has a problem that the transmittance of the element is lowered by the light scattering layer.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide an organic electroluminescence element, an illumination device, and a display device that have a low driving voltage and excellent luminous efficiency.
- the cathode On the support substrate, there is a cathode, a light emitting layer, and an adjacent layer adjacent to the outside of the cathode (opposite side of the light emitting layer).
- the cathode is made of a layer containing a metal and is transparent and has a thickness of 2 nm or more.
- An organic electroluminescence device characterized in that it is less than 10 nm, the adjacent layer has a refractive index of 1.6 or more and 1.95 or less, a film thickness of 15 nm or more and 180 nm or less, and does not contain light scattering particles.
- n1-Y1 [Wherein, n1 represents an integer of 1 or more, Y1 represents a substituent when n1 is 1, and represents a mere bond or an n1-valent linking group when n1 is 2 or more.
- Ar1 represents a group represented by the following general formula (A). When n1 is 2 or more, a plurality of Ar1s may be the same or different. However, the compound represented by the general formula (1) has at least two condensed aromatic heterocycles in which three or more rings are condensed in the molecule. ]
- Y5 represents a divalent linking group comprising an arylene group, a heteroarylene group, or a combination thereof.
- E51 to E66 each represent —C (R3) ⁇ or —N ⁇ , and R3 represents a hydrogen atom or a substituent.
- Y6 to Y9 each represents a group derived from an aromatic hydrocarbon ring or a group derived from an aromatic heterocycle, and at least one of Y6 or Y7 and at least one of Y8 or Y9 is an aromatic group containing an N atom.
- n3 and n4 represent an integer of 0 to 4, and n3 + n4 is an integer of 2 or more.
- 5. 5 The organic electroluminescence device as described in 4 above, wherein the compound represented by the general formula (2) is a compound represented by the following general formula (3).
- Y5 represents a divalent linking group comprising an arylene group, a heteroarylene group, or a combination thereof.
- E51 to E66 and E71 to E88 each represent —C (R3) ⁇ or —N ⁇ , and R3 represents a hydrogen atom or a substituent.
- R3 represents a hydrogen atom or a substituent.
- n3 and n4 represent an integer of 0 to 4, and n3 + n4 is an integer of 2 or more.
- 6 The organic electroluminescence device according to any one of 1 to 5, wherein the main component of the cathode is silver.
- P and Q each represent a carbon atom or a nitrogen atom
- A1 represents an atomic group forming an aromatic hydrocarbon ring or an aromatic heterocyclic ring together with PC.
- A2 represents an atomic group that forms an aromatic heterocycle with QN.
- P1-L1-P2 represents a bidentate ligand, and P1 and P2 each independently represent a carbon atom, a nitrogen atom or an oxygen atom.
- L1 represents an atomic group that forms a bidentate ligand together with P1 and P2.
- j1 represents an integer of 1 to 3
- j2 represents an integer of 0 to 2
- j1 + j2 is 2 or 3.
- M1 represents a group 8-10 transition metal element in the periodic table.
- Z represents a hydrocarbon ring group or a heterocyclic group.
- P and Q each represent a carbon atom or a nitrogen atom
- A1 represents an atomic group that forms an aromatic hydrocarbon ring or an aromatic heterocyclic ring together with P—C.
- P1-L1-P2 represents a bidentate ligand
- P1 and P2 each independently represent a carbon atom, a nitrogen atom, or an oxygen atom.
- L1 represents an atomic group that forms a bidentate ligand together with P1 and P2.
- j1 represents an integer of 1 to 3
- j2 represents an integer of 0 to 2
- j1 + j2 is 2 or 3.
- M1 represents a group 8-10 transition metal element in the periodic table. ] 12 12.
- An illumination device comprising the organic electroluminescence element according to any one of 1 to 14.
- a display device comprising the organic electroluminescence element as described in any one of 1 to 14 above.
- an organic electroluminescence element it was possible to provide an organic electroluminescence element, a lighting device, and a display device having a low driving voltage and excellent luminous efficiency.
- Organic EL element >> First, the preferable specific example of the layer structure of the organic electroluminescent element (organic EL element) of this invention is demonstrated.
- FIG. (I) Support substrate 2 / anode 3 / hole injection layer 4 / hole transport layer 5 / light emitting layer 6 / electron transport layer 7 / cathode 8 / adjacent layer.
- the layer structure of the organic EL element of the present invention may be the following layer structure in addition to this.
- Support substrate / anode / hole injection layer / hole transport layer / light emitting layer / electron transport layer / electron injection layer / cathode / adjacent layer (iii) Support substrate / anode / hole injection layer / hole transport layer / Light emitting layer / hole blocking layer / electron transport layer / cathode / adjacent layer (iv) support substrate / anode / hole injection layer / hole transport layer / first light emitting layer / second light emitting layer / electron transport layer / electrons Injection layer / cathode / adjacent layer (v) support substrate / anode / hole injection layer / hole transport layer / first light emission layer / second light emission layer / third light emission layer / electron transport layer / electron injection layer / cathode / Adjacent layer (vi) Support substrate / anode / hole injection layer / hole transport layer / first light emitting layer / second light emitting layer / hole blocking layer / electron transport
- the organic EL device of the present invention has a transparent cathode and a light emitting layer.
- the transparency of the transparent cathode means that the light transmittance at a wavelength of 550 nm is 50% or more.
- Such light transmittance can be realized by forming the cathode and the electron transport layer with the materials and film thickness described later.
- the transparent cathode is not particularly limited as long as it is a thin film containing a conductive metal, and the contained metal includes aluminum, silver, gold, platinum, copper, tin, indium, magnesium, zinc, germanium, bismuth, and strontium. Further, these metals may be used, or two or more mixtures (alloys) with other metals may be used.
- it may be a thin film formed by co-evaporation of these metals or alloys and organic compounds.
- the anode can be either transparent or opaque depending on the application.
- the light emitting layer preferably contains at least two kinds of light emitting materials having different emission colors, and a single layer or a light emitting layer unit composed of a plurality of light emitting layers 6 may be formed.
- the hole transport layer may also include a hole injection layer and an electron blocking layer (not shown). Details will be described later.
- the organic EL element of the present invention can take a top emission type or double side emission type configuration, and can be used as, for example, a surface light emitter.
- the cathode (also referred to as a cathode electrode or a cathode) in the present invention is not particularly limited as long as it is a thin film containing a conductive metal.
- the contained metal include aluminum, silver, gold, platinum, and copper.
- Such a cathode is preferably formed by a vapor deposition method in the case of one material and by a co-evaporation method in the case of two or more materials.
- the cathode preferably has a thickness in the range of 2 nm or more and less than 10 nm.
- a film thickness of less than 10 nm is preferable because the metal-containing layer absorbs little and the transmittance of the device increases. Further, it is preferable that the film thickness is thicker than 2 nm because the conductivity of the layer is good and the driving voltage does not increase.
- the metal contained in the cathode is preferably as described above, preferably aluminum, silver, gold, tin, indium, magnesium, zinc, etc., and the work function is improved for improving the electron injection property. It is also preferable to form a thin film composed of two or more kinds of materials by co-evaporation with these metals or with another metal or organic compound.
- Particularly preferable examples of the metal contained in the cathode include silver, gold, indium, zinc, and magnesium.
- the adjacent layer adjacent to the side opposite to the light emitting layer of the cathode is not particularly limited as long as the refractive index is 1.6 or more and 1.95 or less and the film thickness is 15 nm or more and 180 nm or less, but preferably 30 nm or more. It is 150 nm or less, More preferably, it is 50 nm or more and 120 nm or less.
- the adjacent layer preferably satisfies the refractive index in a region of 350 nm to 800 nm.
- the adjacent layer preferably contains a metal complex compound or a compound represented by the general formula (1).
- the adjacent layer is characterized by not containing light scattering particles.
- the adjacent layer is made of the following compound having a refractive index of 1.6 or more and 1.95 or less in the same manner as the light emitting layer described later, for example, vacuum deposition method, spin coating method, casting method, LB method, inkjet method, etc.
- the film can be formed by a known thin film forming method.
- Examples of the compound contained in the adjacent layer include pyridine derivatives, BINAP, bipyridine derivatives, phenanthroline derivatives, amino acid derivatives, imino acid derivatives, terpyridine derivatives, EDTA, crown ether derivatives, quinoline derivatives, and the like.
- Preferred are metal complex compounds having pyridine derivatives, phenanthroline derivatives and quinoline derivatives as ligands, and particularly preferred are metal complex compounds having quinoline derivatives as ligands.
- Examples of the central metal of the metal complex compound having a quinoline derivative as a ligand include aluminum, lithium, silver, copper, cobalt, beryllium, zinc, nickel, ruthenium, and phosphorus.
- Aluminum, lithium, copper, ruthenium and the like are preferable, and aluminum and lithium are particularly preferable.
- the metal complex compound having a quinoline derivative as a ligand is preferably lithium quinolate, tris (8-quinolinol) aluminum (Alq 3 ), tris (5,7-dichloro-8-quinolinol) aluminum, tris (5,7 -Dibromo-8-quinolinol) aluminum, tris (2-methyl-8-quinolinol) aluminum, tris (5-methyl-8-quinolinol) aluminum and the like.
- examples of the substituent represented by Y1 include an alkyl group (for example, methyl group, ethyl group, propyl group, isopropyl group, tert-butyl group, pentyl group, hexyl group, octyl group, Dodecyl group, tridecyl group, tetradecyl group, pentadecyl group etc.), cycloalkyl group (eg cyclopentyl group, cyclohexyl group etc.), alkenyl group (eg vinyl group, allyl group etc.), alkynyl group (eg ethynyl group, propargyl etc.) Group), aromatic hydrocarbon group (also called aromatic carbocyclic group, aryl group, etc.), for example, phenyl group, p-chlorophenyl group, mesityl group, tolyl group, xylyl group, naphthyl group, an alkyl group (
- substituents may be further substituted with the above substituents.
- a plurality of these substituents may be bonded to each other to form a ring.
- n1-valent linking group represented by Y1 in the general formula (1) examples include a divalent linking group, a trivalent linking group, and a tetravalent linking group.
- an alkylene group for example, ethylene group, trimethylene group, tetramethylene group, propylene group, ethylethylene group, pentamethylene group, hexamethylene group, 2,2,4-trimethylhexamethylene group, heptamethylene group, octamethylene group, nonamethylene group, decamethylene group, undecamethylene group, dodecamethylene group, cyclohexylene group (for example, 1,6-cyclohexanediyl group, etc.), Cyclopentylene group (for example, 1,5-cyclopentanediyl group and the like), alkenylene group (for example, vinylene group, propenylene group, butenylene group, pentenylene group, 1-methylvinylene group, 1-methylpropenylene group, 2-methylpropenylene group, 1-methylpentenylene group, 3-methyl Pentenylene group, 1-ethylvinylene group, 1-
- acridine ring benzoquinoline ring, carbazole ring, phenazine ring, phenanthridine ring, phenanthroline ring, carboline ring, cyclazine ring, kindrin ring, tepenidine ring, quinindrin ring, triphenodithia Gin ring, triphenodioxazine ring, phenanthrazine ring, anthrazine ring, perimidine ring, diazacarbazole ring (representing any one of carbon atoms constituting carboline ring replaced by nitrogen atom), phenanthroline ring, dibenzofuran Ring, dibenzothiophene ring, naphthofuran ring, naphthothiophene ring Benzodifuran ring, benzodithiophene ring, naphthodifuran ring, naphthodithiophene ring, anthrafur
- examples of the trivalent linking group represented by Y1 include ethanetriyl group, propanetriyl group, butanetriyl group, pentanetriyl group, hexanetriyl group, heptanetriyl group, and octanetriyl.
- the tetravalent linking group represented by Y1 is a group in which one trivalent group is further added to the above trivalent group.
- the divalent linking group, the trivalent linking group, and the tetravalent linking group may each further have a substituent represented by Y1 in the general formula (1).
- Y1 preferably represents a group derived from a condensed aromatic heterocyclic ring formed by condensation of three or more rings, and the three or more rings.
- a condensed aromatic heterocyclic ring formed by condensing a dibenzofuran ring or a dibenzothiophene ring is preferable.
- n1 is preferably 2 or more.
- the compound represented by the general formula (1) has at least two condensed aromatic heterocycles obtained by condensing the above three or more rings in the molecule.
- Y1 represents an n1-valent linking group
- Y1 is preferably non-conjugated in order to keep the triplet excitation energy of the compound represented by the general formula (1) high, and further, Tg (glass transition In view of improving the point, also referred to as glass transition temperature, it is preferably composed of an aromatic ring (aromatic hydrocarbon ring + aromatic heterocycle).
- non-conjugated means that the linking group cannot be expressed by repeating a single bond (also referred to as a single bond) and a double bond, or the conjugation between aromatic rings constituting the linking group is sterically cleaved. Means.
- Ar1 represents a group represented by the following general formula (A).
- X represents —N (R) —, —O—, —S— or —Si (R) (R ′) —
- E1 to E8 represent —C (R1) ⁇ or —N ⁇ .
- R, R ′ and R1 each represent a hydrogen atom, a substituent or a linking site with Y1. * Represents a linking site with Y1.
- Y2 represents a simple bond or a divalent linking group.
- Y3 and Y4 each represent a group derived from a 5-membered or 6-membered aromatic ring, and at least one represents a group derived from an aromatic heterocycle containing a nitrogen atom as a ring constituent atom.
- n2 represents an integer of 1 to 4.
- the divalent linking group represented by Y2 has the same meaning as the divalent linking group represented by Y1 in the general formula (1).
- a 5-membered or 6-membered aromatic ring used for forming a group derived from a 5-membered or 6-membered aromatic ring represented by Y3 and Y4, respectively, includes a benzene ring, oxazole Examples thereof include a ring, a thiophene ring, a furan ring, a pyrrole ring, a pyridine ring, a pyridazine ring, a pyrimidine ring, a pyrazine ring, a diazine ring, a triazine ring, an imidazole ring, an isoxazole ring, a pyrazole ring, and a triazole ring.
- At least one of the groups derived from a 5-membered or 6-membered aromatic ring represented by Y3 and Y4 respectively represents a group derived from an aromatic heterocycle containing a nitrogen atom as a ring-constituting atom
- the aromatic heterocycle containing a nitrogen atom as the ring atom include an oxazole ring, a pyrrole ring, a pyridine ring, a pyridazine ring, a pyrimidine ring, a pyrazine ring, a diazine ring, a triazine ring, an imidazole ring, an isoxazole ring, a pyrazole ring, Examples include a triazole ring.
- the group represented by Y3 is preferably a group derived from the above 6-membered aromatic ring, and more preferably a group derived from a benzene ring.
- the group represented by Y4 is preferably a group derived from the 6-membered aromatic ring, more preferably an aromatic heterocycle containing a nitrogen atom as a ring constituent atom. Particularly preferably, Y4 is a group derived from a pyridine ring.
- X represents —N (R) —, —O—, —S— or —Si (R) (R ′) —
- E1 to E8 represent —C (R1) ⁇ or —N ⁇
- R, R ′ and R1 each represent a hydrogen atom, a substituent or a linking site with Y1.
- Y2 represents a simple bond or a divalent linking group.
- E11 to E20 each represent —C (R2) ⁇ or —N ⁇ , and at least one represents —N ⁇ .
- R2 represents a hydrogen atom, a substituent or a linking site. However, at least one of E11 and E12 represents —C (R2) ⁇ , and R2 represents a linking site.
- n2 represents an integer of 1 to 4. * Represents a linking site with Y1 in the general formula (1).
- X represents —N (R) —, —O—, —S— or —Si (R) (R ′) —
- E1 to E8 represent —C (R1) ⁇ or —N ⁇
- R, R ′ and R1 each represent a hydrogen atom, a substituent or a linking site with Y1.
- Y2 represents a simple bond or a divalent linking group.
- R2 represents a hydrogen atom, a substituent or a linking site
- R3 and R4 represent a hydrogen atom or a substituent.
- at least one of E21 or E22 represents —C (R2) ⁇
- R2 represents a linking site
- n2 represents an integer of 1 to 4. * Represents a linking site with Y1 in the general formula (1).
- X represents —N (R) —, —O—, —S— or —Si (R) (R ′) —
- E1 to E8 represent —C (R1) ⁇ or —N ⁇
- R, R ′ and R1 each represent a hydrogen atom, a substituent or a linking site with Y1.
- Y2 represents a simple bond or a divalent linking group.
- R2 represents a hydrogen atom, a substituent or a linking site
- R3 and R4 represent a hydrogen atom or a substituent.
- at least one of E32 or E33 is represented by —C (R2) ⁇
- R2 represents a linking site
- n2 represents an integer of 1 to 4. * Represents a linking site with Y1 in the general formula (1).
- X represents —N (R) —, —O—, —S— or —Si (R) (R ′) —
- E1 to E8 represent —C (R1) ⁇ or —N ⁇
- R, R ′ and R1 each represent a hydrogen atom, a substituent or a linking site with Y1.
- Y2 represents a simple bond or a divalent linking group.
- E41 to E50 each represent —C (R2) ⁇ , —N ⁇ , —O—, —S— or —Si (R3) (R4) —, and at least one of them represents —N ⁇ .
- R2 represents a hydrogen atom, a substituent or a linking site
- R3 and R4 represent a hydrogen atom or a substituent.
- n2 represents an integer of 1 to 4. * Represents a linking site with Y1 in the general formula (1).
- the divalent linking group represented by Y2 is a divalent group represented by Y1 in the general formula (1). It is synonymous with the linking group.
- Y5 represents a divalent linking group composed of an arylene group, a heteroarylene group, or a combination thereof.
- E51 to E66 each represent —C (R3) ⁇ or —N ⁇ , and R3 represents a hydrogen atom or a substituent.
- Y6 to Y9 each represents a group derived from an aromatic hydrocarbon ring or a group derived from an aromatic heterocycle, and at least one of Y6 or Y7 and at least one of Y8 or Y9 is an aromatic group containing an N atom.
- n3 and n4 represent an integer of 0 to 4, and n3 + n4 is an integer of 2 or more.
- the arylene group and heteroarylene group represented by Y5 are the arylene group and heteroarylene group described as an example of the divalent linking group represented by Y1 in general formula (1).
- the divalent linking group comprising an arylene group, a heteroarylene group or a combination thereof represented by Y5
- a condensed aromatic heterocycle formed by condensation of three or more rings among the heteroarylene groups, a condensed aromatic heterocycle formed by condensation of three or more rings.
- a group derived from a condensed aromatic heterocycle formed by condensation of three or more rings is preferably included, and the group derived from a dibenzofuran ring or a dibenzothiophene ring is preferable.
- the group derived from a dibenzofuran ring or a dibenzothiophene ring is preferable.
- Y6 to Y9 are each an aromatic hydrocarbon ring used for forming a group derived from an aromatic hydrocarbon ring, such as a benzene ring, a biphenyl ring, a naphthalene ring, an azulene ring, an anthracene ring Phenanthrene ring, pyrene ring, chrysene ring, naphthacene ring, triphenylene ring, o-terphenyl ring, m-terphenyl ring, p-terphenyl ring, acenaphthene ring, coronene ring, fluorene ring, fluoranthrene ring, naphthacene ring , Pentacene ring, perylene ring, pentaphen ring, picene ring, pyrene ring, pyranthrene ring, anthraanthrene ring, and the like.
- aromatic hydrocarbon ring may have a substituent represented by Y1 in the general formula (1).
- Y6 to Y9 are each an aromatic heterocycle used for forming a group derived from an aromatic heterocycle, such as a furan ring, a thiophene ring, an oxazole ring, a pyrrole ring, or a pyridine ring.
- aromatic heterocyclic ring may have a substituent represented by Y1 in the general formula (1).
- an aromatic heterocycle containing an N atom used for forming a group derived from an aromatic heterocycle containing an N atom represented by at least one of Y6 or Y7 and at least one of Y8 or Y9.
- the ring include, for example, an oxazole ring, pyrrole ring, pyridine ring, pyridazine ring, pyrimidine ring, pyrazine ring, triazine ring, benzimidazole ring, oxadiazole ring, triazole ring, imidazole ring, pyrazole ring, thiazole ring, Indole ring, indazole ring, benzimidazole ring, benzothiazole ring, benzoxazole ring, quinoxaline ring, quinazoline ring, cinnoline ring, quinoline ring, isoquinoline ring, phthalazine ring, naphthy
- the groups represented by Y7 and Y9 each preferably represent a group derived from a pyridine ring.
- the groups represented by Y6 and Y8 each preferably represent a group derived from a benzene ring.
- Y5 represents a divalent linking group composed of an arylene group, a heteroarylene group, or a combination thereof.
- E51 to E66 and E71 to E88 each represent —C (R3) ⁇ or —N ⁇ , and R3 represents a hydrogen atom or a substituent.
- R3 represents a hydrogen atom or a substituent.
- n3 and n4 represent an integer of 0 to 4, and n3 + n4 is an integer of 2 or more.
- the arylene group and heteroarylene group represented by Y5 are the arylene group and heteroarylene group described as an example of the divalent linking group represented by Y1 in general formula (1). Are synonymous with each other.
- the divalent linking group comprising an arylene group, a heteroarylene group or a combination thereof represented by Y5
- a condensed aromatic heterocycle formed by condensation of three or more rings among the heteroarylene groups, a condensed aromatic heterocycle formed by condensation of three or more rings.
- a group derived from a condensed aromatic heterocycle formed by condensation of three or more rings is preferably included, and the group derived from a dibenzofuran ring or a dibenzothiophene ring is preferable.
- Y5 a condensed aromatic heterocycle formed by condensation of three or more rings.
- a group derived from a condensed aromatic heterocycle formed by condensation of three or more rings is preferably included, and the group derived from a dibenzofuran ring or a dibenzothiophene ring is preferable.
- E71 to E74 and E80 to E83 are each represented by —C (R3) ⁇ .
- DMAc dimethylacetamide
- Step 2 (Synthesis of Intermediate 2) Intermediate 1 (0.5 mol) was dissolved in 100 ml of DMF at room temperature under air, NBS (2.0 mol) was added, and the mixture was stirred overnight at room temperature. The resulting precipitate was filtered and washed with methanol, yielding intermediate 2 in 92% yield.
- Step 3 (Synthesis of Compound 5) Under a nitrogen atmosphere, intermediate 2 (0.25 mol), 2-phenylpyridine (1.0 mol), ruthenium complex [( ⁇ 6 -C 6 H 6 ) RuCl 2 ] 2 (0.05 mol), triphenyl Phosphine (0.2 mol) and potassium carbonate (12 mol) were mixed in 3 l of NMP (N-methyl-2-pyrrolidone) and stirred at 140 ° C. overnight.
- NMP N-methyl-2-pyrrolidone
- an organic EL element 1B in which an auxiliary electrode 8-1 is provided for the purpose of reducing the resistance between the cathode 8 and the adjacent layer 9 may be used.
- the material for forming the auxiliary electrode is preferably a metal with low resistance such as gold, platinum, silver, copper, or aluminum.
- Examples of the method for forming the auxiliary electrode include a vapor deposition method, a sputtering method, a printing method, an ink jet method, and an aerosol jet method.
- the line width of the auxiliary electrode is preferably 50 ⁇ m or less from the viewpoint of the aperture ratio of the cathode, and the thickness of the auxiliary electrode is preferably 1 ⁇ m or more from the viewpoint of conductivity.
- an electron transport layer containing an electron transport compound is further provided between the cathode and the light emitting layer.
- the electron transport layer is made of a material having a function of transporting electrons, and in a broad sense, an electron injection layer (not shown) and a hole blocking layer (not shown) are also included in the electron transport layer.
- the electron transport layer can be provided as a single layer or a plurality of layers.
- an electron transport material also serving as a hole blocking material used for an electron transport layer adjacent to the cathode side with respect to the light emitting layer is injected from the cathode.
- Any material may be used as long as it has a function of transferring electrons to the light-emitting layer, and any material can be selected from conventionally known compounds. Examples include nitro-substituted fluorene derivatives, diphenylquinone derivatives, thiopyran dioxide derivatives, carbodiimides, fluorenylidenemethane derivatives, anthraquinodimethane, anthrone derivatives, and oxadiazole derivatives.
- a thiadiazole derivative in which the oxygen atom of the oxadiazole ring is substituted with a sulfur atom, and a quinoxaline derivative having a quinoxaline ring known as an electron-withdrawing group can also be used as a material for the electron transport layer. It can. Furthermore, a polymer material in which these materials are introduced into a polymer chain or these materials are used as a polymer main chain can also be used.
- metal complexes of 8-quinolinol derivatives such as tris (8-quinolinol) aluminum (Alq 3 ), tris (5,7-dichloro-8-quinolinol) aluminum, tris (5,7-dibromo-8-quinolinol) Aluminum, tris (2-methyl-8-quinolinol) aluminum, tris (5-methyl-8-quinolinol) aluminum, bis (8-quinolinol) zinc (Znq), etc.
- Mg Metal complexes replaced with Cu, Ca, Sn, Ga, or Pb can also be used as the material for the electron transport layer.
- metal-free or metal phthalocyanine or those having terminal ends substituted with an alkyl group or a sulfonic acid group can be preferably used as the material for the electron transport layer.
- distyrylpyrazine derivatives exemplified as the material for the light emitting layer can also be used as the material for the electron transport layer, and n-type-Si, n-type-SiC, etc. as well as the hole injection layer and the hole transport layer.
- These inorganic semiconductors can also be used as a material for the electron transport layer.
- the electron transport layer can be formed by thinning the above material by a known method such as a vacuum deposition method, a spin coating method, a casting method, a printing method including an ink jet method, or an LB method.
- the thickness of the electron transport layer is not particularly limited, but is usually about 5 nm to 5 ⁇ m, preferably 5 to 200 nm.
- the electron transport layer may have a single layer structure composed of one or more of the above materials.
- impurities can be doped in the electron transport layer to increase the n property.
- impurities include JP-A-4-297076, JP-A-10-270172, JP-A-2000-196140, 2001-102175, J.A. Appl. Phys. 95, 5773 (2004), and the like.
- the potassium compound for example, potassium fluoride can be used.
- an electron transport layer containing a potassium compound such as potassium fluoride is preferable from the viewpoint of increasing the transmittance of the cathode of the present invention and decreasing the resistance value. This is because when the cathode of the present invention is formed on an electron transport layer containing a potassium compound such as potassium fluoride, the growth of the silver thin film can be controlled in a preferable direction, and the conductivity can be secured even with a thinner film thickness. Because.
- the material for the electron transport layer preferably, compounds represented by the general formulas (1) to (3) described in the section of the adjacent layer can be used.
- the light emitting layer used in the present invention contains a phosphorescent light emitting compound and / or a fluorescent light emitting compound as a light emitting material.
- the light-emitting layer is a layer that emits light by recombination of electrons and holes injected from the electrode, the electron transport layer, or the hole transport layer, and the light-emitting portion is the light-emitting layer even in the light-emitting layer. It may be an interface with an adjacent layer.
- the light emitting layer is not particularly limited in its configuration as long as the light emitting material included satisfies the light emission requirements. Moreover, there may be a plurality of layers having the same emission spectrum and emission maximum wavelength. Moreover, it is preferable to have a non-light emitting intermediate
- the total film thickness of the light emitting layer is preferably in the range of 1 to 100 nm, and more preferably 1 to 30 nm because a lower driving voltage can be obtained. Note that the total film thickness of the light emitting layer is a film thickness including the intermediate layer when a non-light emitting intermediate layer exists between the light emitting layers.
- each light emitting layer is preferably adjusted in the range of 1 to 50 nm, more preferably in the range of 1 to 20 nm. There is no particular limitation on the relationship between the film thicknesses of the blue, green and red light emitting layers.
- the light emitting layer can be formed by forming a light emitting material or a host compound, which will be described later, by a known thin film forming method such as a vacuum deposition method, a spin coating method, a casting method, an LB method, or an ink jet method.
- a known thin film forming method such as a vacuum deposition method, a spin coating method, a casting method, an LB method, or an ink jet method.
- each light emitting layer a plurality of light emitting materials may be mixed, or a phosphorescent light emitting material and a fluorescent light emitting material (also referred to as a fluorescent dopant or a fluorescent compound) may be mixed and used in the same light emitting layer 6.
- a phosphorescent light emitting material and a fluorescent light emitting material also referred to as a fluorescent dopant or a fluorescent compound
- the structure of the light emitting layer preferably contains a host compound (also referred to as a light emitting host or the like) and a light emitting material (also referred to as a light emitting dopant compound) and emits light from the light emitting material.
- a host compound also referred to as a light emitting host or the like
- a light emitting material also referred to as a light emitting dopant compound
- a compound having a phosphorescence quantum yield of phosphorescence emission at room temperature (25 ° C.) of less than 0.1 is preferable. More preferably, the phosphorescence quantum yield is less than 0.01. Moreover, it is preferable that the volume ratio in the layer is 50% or more among the compounds contained in the light emitting layer 6.
- a known host compound may be used alone, or a plurality of types may be used.
- a plurality of types of host compounds it is possible to adjust the movement of charges, and the efficiency of the organic EL element 1A can be improved.
- a plurality of kinds of light emitting materials described later it is possible to mix different light emission, thereby obtaining an arbitrary light emission color.
- the host compound used may be a conventionally known low molecular compound, a high molecular compound having a repeating unit, or a low molecular compound having a polymerizable group such as a vinyl group or an epoxy group (evaporation polymerizable light emitting host). .
- the known host compound a compound having a hole transporting ability and an electron transporting ability, preventing an increase in the wavelength of light emission and having a high Tg (glass transition temperature) is preferable.
- the glass transition point (Tg) here is a value determined by a method based on JIS-K-7121 using DSC (Differential Scanning Colorimetry).
- H1 to H79 Specific examples (H1 to H79) of host compounds that can be used in the present invention are shown below, but are not limited thereto.
- a phosphorescent compound As a light-emitting material that can be used in the present invention, a phosphorescent compound (also referred to as a phosphorescent compound or a phosphorescent material) can be given.
- a phosphorescent compound is a compound in which light emission from an excited triplet is observed. Specifically, a phosphorescent compound emits phosphorescence at room temperature (25 ° C.), and a phosphorescence quantum yield of 0.01 at 25 ° C. Although defined as the above compounds, the preferred phosphorescence quantum yield is 0.1 or more.
- the phosphorescent quantum yield can be measured by the method described in Spectra II, page 398 (1992 version, Maruzen) of Experimental Chemistry Course 4 of the 4th edition. Although the phosphorescence quantum yield in a solution can be measured using various solvents, when using a phosphorescent compound in the present invention, the above phosphorescence quantum yield (0.01 or more) is achieved in any solvent. It only has to be done.
- phosphorescent compounds There are two types of light emission principles of phosphorescent compounds. One is that recombination of carriers occurs on the host compound to which carriers are transported to generate an excited state of the host compound, and this energy is transferred to the phosphorescent compound to obtain light emission from the phosphorescent compound.
- the other is a carrier trap type in which the phosphorescent compound becomes a carrier trap, and carriers are recombined on the phosphorescent compound to emit light from the phosphorescent compound. In any case, it is a condition that the excited state energy of the phosphorescent compound is lower than the excited state energy of the host compound.
- the phosphorescent compound can be appropriately selected from known compounds used for the light emitting layer of the organic EL device, and preferably a complex compound containing a metal of group 8 to 10 in the periodic table of elements. More preferred are iridium compounds, osmium compounds, platinum compounds (platinum complex compounds), and rare earth complexes, and most preferred are iridium compounds.
- At least one light emitting layer may contain two or more phosphorescent compounds, and the concentration ratio of the phosphorescent compounds in the light emitting layer may vary in the thickness direction of the light emitting layer. Good.
- the phosphorescent compound is preferably 0.1% by volume or more and less than 30% by volume with respect to the total amount of the light emitting layer.
- the compound (phosphorescent compound) contained in the light emitting layer is preferably a compound represented by the following general formula (4).
- the phosphorescent compound represented by the general formula (4) (also referred to as a phosphorescent metal complex) is contained as a light emitting dopant in the light emitting layer of the organic EL device according to the present invention.
- the constituent layer of the organic EL element 1 according to the present invention will be described in detail later).
- P and Q each represent a carbon atom or a nitrogen atom
- A1 represents an atomic group that forms an aromatic hydrocarbon ring or an aromatic heterocycle with PC.
- A2 represents an atomic group that forms an aromatic heterocycle with QN.
- P1-L1-P2 represents a bidentate ligand
- P1 and P2 each independently represent a carbon atom, a nitrogen atom or an oxygen atom.
- L1 represents an atomic group that forms a bidentate ligand together with P1 and P2.
- j1 represents an integer of 1 to 3
- j2 represents an integer of 0 to 2
- j1 + j2 is 2 or 3.
- M1 represents a group 8-10 transition metal element in the periodic table.
- P and Q each represent a carbon atom or a nitrogen atom.
- examples of the aromatic hydrocarbon ring that A1 forms with PC include a benzene ring, a biphenyl ring, a naphthalene ring, an azulene ring, an anthracene ring, a phenanthrene ring, a pyrene ring, a chrysene ring, Naphthacene ring, triphenylene ring, o-terphenyl ring, m-terphenyl ring, p-terphenyl ring, acenaphthene ring, coronene ring, fluorene ring, fluoranthrene ring, naphthacene ring, pentacene ring, perylene ring, pentaphen ring, Examples include a picene ring, a pyrene ring, a pyranthrene ring, and an anthraanthrene ring.
- These rings may further have a substituent represented by Y1 in the general formula (1).
- the aromatic heterocycle formed by A1 together with P—C includes a furan ring, a thiophene ring, an oxazole ring, a pyrrole ring, a pyridine ring, a pyridazine ring, a pyrimidine ring, a pyrazine ring, a triazine ring, Benzimidazole ring, oxadiazole ring, triazole ring, imidazole ring, pyrazole ring, thiazole ring, indole ring, benzimidazole ring, benzothiazole ring, benzoxazole ring, quinoxaline ring, quinazoline ring, phthalazine ring, carbazole ring, azacarbazole A ring etc. are mentioned.
- the azacarbazole ring means one in which at least one carbon atom of the benzene ring constituting the carbazole ring is replaced with a nitrogen atom.
- These rings may further have a substituent represented by Y1 in the general formula (1).
- examples of the aromatic heterocycle formed by A2 together with QN include an oxazole ring, an oxadiazole ring, an oxatriazole ring, an isoxazole ring, a tetrazole ring, a thiadiazole ring, a thiatriazole ring, Examples include a thiazole ring, a pyrrole ring, a pyridine ring, a pyridazine ring, a pyrimidine ring, a pyrazine ring, a triazine ring, an imidazole ring, a pyrazole ring, and a triazole ring.
- These rings may further have a substituent represented by Y1 in the general formula (1).
- P1-L1-P2 represents a bidentate ligand
- P1 and P2 each independently represent a carbon atom, a nitrogen atom or an oxygen atom
- L1 represents an atomic group that forms a bidentate ligand together with P1 and P2.
- Examples of the bidentate ligand represented by P1-L1-P2 include phenylpyridine, phenylpyrazole, phenylimidazole, phenyltriazole, phenyltetrazole, pyrazabol, acetylacetone, picolinic acid, and the like.
- j1 represents an integer of 1 to 3
- j2 represents an integer of 0 to 2
- j1 + j2 represents 2 or 3
- j2 is preferably 0.
- M1 is a transition metal element of Group 8 to Group 10 (simply referred to as a transition metal) in the periodic table, and iridium is particularly preferable.
- Z represents a hydrocarbon ring group or a heterocyclic group.
- P and Q each represent a carbon atom or a nitrogen atom
- A1 represents an atomic group that forms an aromatic hydrocarbon ring or an aromatic heterocyclic ring together with P—C.
- P1-L1-P2 represents a bidentate ligand
- P1 and P2 each independently represent a carbon atom, a nitrogen atom, or an oxygen atom.
- L1 represents an atomic group that forms a bidentate ligand together with P1 and P2.
- j1 represents an integer of 1 to 3
- j2 represents an integer of 0 to 2
- j1 + j2 is 2 or 3.
- M1 represents a group 8-10 transition metal element in the periodic table.
- examples of the hydrocarbon ring group represented by Z include a non-aromatic hydrocarbon ring group and an aromatic hydrocarbon ring group, and examples of the non-aromatic hydrocarbon ring group include a cyclopropyl group. , Cyclopentyl group, cyclohexyl group and the like. These groups may be unsubstituted or have a substituent described later.
- aromatic hydrocarbon ring group examples include, for example, phenyl group, p-chlorophenyl group, mesityl group, tolyl group, xylyl group, naphthyl group, anthryl group, azulenyl. Group, acenaphthenyl group, fluorenyl group, phenanthryl group, indenyl group, pyrenyl group, biphenylyl group and the like.
- These groups may be unsubstituted or may have a substituent represented by Y1 in the general formula (1).
- examples of the heterocyclic group represented by Z include a non-aromatic heterocyclic group and an aromatic heterocyclic group.
- examples of the non-aromatic heterocyclic group include an epoxy ring and an aziridine group. Ring, thiirane ring, oxetane ring, azetidine ring, thietane ring, tetrahydrofuran ring, dioxolane ring, pyrrolidine ring, pyrazolidine ring, imidazolidine ring, oxazolidine ring, tetrahydrothiophene ring, sulfolane ring, thiazolidine ring, ⁇ -caprolactone ring, ⁇ - Caprolactam ring, piperidine ring, hexahydropyridazine ring, hexahydropyrimidine ring, piperazine ring, morpholine ring, tetrahydropyran ring
- These groups may be unsubstituted or may have a substituent represented by Y1 in the general formula (1).
- aromatic heterocyclic group examples include a pyridyl group, pyrimidinyl group, furyl group, pyrrolyl group, imidazolyl group, benzoimidazolyl group, pyrazolyl group, pyrazinyl group, triazolyl group (for example, 1,2,4-triazol-1-yl).
- oxazolyl group 1,2,3-triazol-1-yl group, etc.
- benzoxazolyl group thiazolyl group, isoxazolyl group, isothiazolyl group, furazanyl group, thienyl group, quinolyl group, benzofuryl group, dibenzofuryl group , Benzothienyl group, dibenzothienyl group, indolyl group, carbazolyl group, carbolinyl group, diazacarbazolyl group (indicating that one of the carbon atoms constituting the carboline ring of the carbolinyl group is replaced by a nitrogen atom), quinoxalinyl Group, pyridazinyl group, triazinyl group, Nazoriniru group, phthalazinyl group, and the like.
- These groups may be unsubstituted or may have a substituent represented by Y1 in the general formula (1).
- the group represented by Z is an aromatic hydrocarbon ring group or an aromatic heterocyclic group.
- the aromatic hydrocarbon ring that A1 forms with P—C includes benzene ring, biphenyl ring, naphthalene ring, azulene ring, anthracene ring, phenanthrene ring, pyrene ring, chrysene ring, naphthacene ring , Triphenylene ring, o-terphenyl ring, m-terphenyl ring, p-terphenyl ring, acenaphthene ring, coronene ring, fluorene ring, fluoranthrene ring, naphthacene ring, pentacene ring, perylene ring, pentaphen ring, picene ring , Pyrene ring, pyranthrene ring, anthraanthrene ring and the like.
- These rings may further have a substituent represented by Y1 in the general formula (1).
- the aromatic heterocycle formed by A1 together with P—C includes furan ring, thiophene ring, oxazole ring, pyrrole ring, pyridine ring, pyridazine ring, pyrimidine ring, pyrazine ring, triazine ring, benzo Imidazole ring, oxadiazole ring, triazole ring, imidazole ring, pyrazole ring, thiazole ring, indole ring, benzimidazole ring, benzothiazole ring, benzoxazole ring, quinoxaline ring, quinazoline ring, phthalazine ring, carbazole ring, carboline ring, And azacarbazole ring.
- the azacarbazole ring means one in which at least one carbon atom of the benzene ring constituting the carbazole ring is replaced with a nitrogen atom.
- These rings may further have a substituent represented by Y1 in the general formula (1).
- examples of the bidentate ligand represented by P1-L1-P2 include phenylpyridine, phenylpyrazole, phenylimidazole, phenyltriazole, phenyltetrazole, pyrazabole, acetylacetone, and picolinic acid. .
- J1 represents an integer of 1 to 3
- j2 represents an integer of 0 to 2
- j1 + j2 represents 2 or 3
- j2 is preferably 0.
- transition metal elements of groups 8 to 10 in the periodic table of elements represented by M1 (also simply referred to as transition metals) in the periodic table of elements represented by M1 in the general formula (4) Synonymous with group 8-10 transition metal elements.
- R 03 represents a substituent
- R 04 represents a hydrogen atom or a substituent
- a plurality of R 04 may be bonded to each other to form a ring.
- n01 represents an integer of 1 to 4.
- R 05 represents a hydrogen atom or a substituent, and a plurality of R 05 may be bonded to each other to form a ring.
- n02 represents an integer of 1 to 2.
- R 06 represents a hydrogen atom or a substituent, and may combine with each other to form a ring.
- n03 represents an integer of 1 to 4.
- Z1 represents an atomic group necessary for forming a 6-membered aromatic hydrocarbon ring or a 5-membered or 6-membered aromatic heterocycle together with C—C.
- Z2 represents an atomic group necessary for forming a hydrocarbon ring group or a heterocyclic group.
- P1-L1-P2 represents a bidentate ligand, and P1 and P2 each independently represent a carbon atom, a nitrogen atom or an oxygen atom.
- L1 represents an atomic group that forms a bidentate ligand together with P1 and P2.
- j1 represents an integer of 1 to 3
- j2 represents an integer of 0 to 2
- j1 + j2 is 2 or 3.
- M1 represents a group 8-10 transition metal element in the periodic table.
- R 03 and R 06 , R 04 and R 0 6, and R 05 and R 06 may be bonded to each other to form a ring.
- each of the substituents represented by R 03 , R 04 , R 05 , and R 06 has the same meaning as the substituent represented by Y 1 in the general formula (1).
- examples of the 6-membered aromatic hydrocarbon ring formed by Z1 together with C—C include a benzene ring.
- These rings may further have a substituent represented by Y1 in the general formula (1).
- examples of the 5- or 6-membered aromatic heterocycle formed by Z1 together with C—C include oxazole ring, oxadiazole ring, oxatriazole ring, isoxazole ring, tetrazole ring, thiadiazole And a ring, a thiatriazole ring, an isothiazole ring, a thiophene ring, a furan ring, a pyrrole ring, a pyridine ring, a pyridazine ring, a pyrimidine ring, a pyrazine ring, a triazine ring, an imidazole ring, a pyrazole ring, and a triazole ring.
- These rings may further have a substituent represented by Y1 in the general formula (1).
- examples of the hydrocarbon ring group represented by Z2 include a non-aromatic hydrocarbon ring group and an aromatic hydrocarbon ring group, and examples of the non-aromatic hydrocarbon ring group include a cyclopropyl group. , Cyclopentyl group, cyclohexyl group and the like. These groups may be unsubstituted or have a substituent described later.
- aromatic hydrocarbon ring group examples include, for example, phenyl group, p-chlorophenyl group, mesityl group, tolyl group, xylyl group, naphthyl group, anthryl group, azulenyl.
- aromatic hydrocarbon group examples include, for example, phenyl group, p-chlorophenyl group, mesityl group, tolyl group, xylyl group, naphthyl group, anthryl group, azulenyl.
- These groups may be unsubstituted or may have a substituent represented by Y1 in the general formula (1).
- examples of the heterocyclic group represented by Z2 include a non-aromatic heterocyclic group and an aromatic heterocyclic group.
- examples of the non-aromatic heterocyclic group include an epoxy ring and an aziridine group. Ring, thiirane ring, oxetane ring, azetidine ring, thietane ring, tetrahydrofuran ring, dioxolane ring, pyrrolidine ring, pyrazolidine ring, imidazolidine ring, oxazolidine ring, tetrahydrothiophene ring, sulfolane ring, thiazolidine ring, ⁇ -caprolactone ring, ⁇ - Caprolactam ring, piperidine ring, hexahydropyridazine ring, hexahydropyrimidine ring, piperazine ring, morpholine ring, tetrahydropyran
- aromatic heterocyclic group examples include a pyridyl group, pyrimidinyl group, furyl group, pyrrolyl group, imidazolyl group, benzoimidazolyl group, pyrazolyl group, pyrazinyl group, triazolyl group (for example, 1,2,4-triazol-1-yl).
- oxazolyl group 1,2,3-triazol-1-yl group, etc.
- benzoxazolyl group thiazolyl group, isoxazolyl group, isothiazolyl group, furazanyl group, thienyl group, quinolyl group, benzofuryl group, dibenzofuryl group , Benzothienyl group, dibenzothienyl group, indolyl group, carbazolyl group, carbolinyl group, diazacarbazolyl group (indicating that one of the carbon atoms constituting the carboline ring of the carbolinyl group is replaced by a nitrogen atom), quinoxalinyl Group, pyridazinyl group, triazinyl group, Nazoriniru group, phthalazinyl group, and the like.
- These rings may be unsubstituted or may further have a substituent represented by Y1 in the general formula (1).
- the group formed by Z1 and Z2 is preferably a benzene ring.
- the bidentate ligand represented by P1-L1-P2 has the same meaning as the bidentate ligand represented by P1-L1-P2 in the general formula (4). .
- the transition metal elements of groups 8 to 10 in the periodic table of elements represented by M1 are the transition metal groups of groups 8 to 10 in the periodic table of elements represented by M1 in the general formula (4). Synonymous with metal element.
- the phosphorescent compound can be appropriately selected from known compounds used for the light emitting layer of the organic EL device.
- the phosphorescent compound according to the present invention is preferably a complex compound containing a group 8-10 metal in the periodic table of elements, more preferably an iridium compound, an osmium compound, or a platinum compound (platinum complex compound). Rare earth complexes, most preferably iridium compounds.
- Pt-1 to Pt-3, A-1, Ir-1 to Ir-45 Specific examples (Pt-1 to Pt-3, A-1, Ir-1 to Ir-45) of phosphorescent compounds according to the present invention are shown below, but the present invention is not limited to these.
- m and n represent the number of repetitions.
- phosphorescent compound also referred to as a phosphorescent metal complex or the like
- Fluorescent materials include coumarin dyes, pyran dyes, cyanine dyes, croconium dyes, squalium dyes, oxobenzanthracene dyes, fluorescein dyes, rhodamine dyes, pyrylium dyes, perylene dyes, stilbene dyes Examples thereof include dyes, polythiophene dyes, and rare earth complex phosphors.
- the organic EL device includes a blocking layer (a hole blocking layer (not shown), an electron blocking layer (not shown)), an injection layer (an electron injection layer (not shown), and a hole injection as constituent layers. Layer (see FIG. 1)) or the like.
- the blocking layer is provided as necessary in addition to the basic constituent layer of the organic compound thin film as described above. For example, it is described in JP-A Nos. 11-204258 and 11-204359, and “Organic EL elements and the forefront of industrialization (published by NTT Corporation on November 30, 1998)” on page 237. There is a hole blocking (hole blocking) layer.
- the hole blocking layer has the function of the electron transport layer 7 in a broad sense.
- the hole blocking layer is made of a hole blocking material that has a function of transporting electrons but has a very small ability to transport holes, and recombines electrons and holes by blocking holes while transporting electrons. Probability can be improved.
- the structure of the electron carrying layer 7 mentioned later can be used as a hole-blocking layer based on this invention as needed.
- the hole blocking layer is preferably provided adjacent to the light emitting layer 6.
- the electron blocking layer has the function of the hole transport layer 5 in a broad sense.
- the electron blocking layer is made of a material that has a function of transporting holes but has a very small ability to transport electrons, and improves the probability of recombination of electrons and holes by blocking electrons while transporting holes. be able to.
- the structure of the positive hole transport layer 5 mentioned later can be used as an electron blocking layer as needed.
- the film thickness of the hole blocking layer according to the present invention is preferably 3 to 100 nm, and more preferably 5 to 30 nm.
- An injection layer is a layer provided between an electrode and an organic layer (light-emitting layer) in order to reduce drive voltage and improve light emission luminance.
- the organic EL element and its industrialization front line June 30, 1998, N.N. (Published by TS Co., Ltd.) ”, Chapter 2, Chapter 2,“ Electrode Materials ”(pages 123 to 166), which is described in detail, and includes a hole injection layer (see FIG. 1) and an electron injection layer.
- the injection layer can be provided as necessary. As described above, it may exist between the anode and the light emitting layer or the hole transport layer, and between the cathode and the light emitting layer or the electron transport layer.
- JP-A Nos. 9-45479, 9-260062, and 8-288069 The details of the hole injection layer are described in JP-A Nos. 9-45479, 9-260062, and 8-288069. Specific examples thereof include a phthalocyanine layer represented by copper phthalocyanine. And an oxide layer typified by vanadium oxide, an amorphous carbon layer, and a polymer layer using a conductive polymer such as polyaniline (emeraldine) or polythiophene.
- the details of the electron injection layer are also described in JP-A-6-325871, JP-A-9-17574, JP-A-10-74586, and the like, and specifically, metals such as strontium and aluminum Examples thereof include an alkali metal halide layer typified by potassium fluoride, an alkaline earth metal compound layer typified by magnesium fluoride, and an oxide layer typified by molybdenum oxide.
- the electron injection layer of the present invention is desirably a very thin film, and the film thickness is preferably in the range of 1 nm to 10 ⁇ m although it depends on the material.
- the hole transport layer is made of a hole transport material having a function of transporting holes, and in a broad sense, a hole injection layer and an electron blocking layer are also included in the hole transport layer.
- the hole transport layer can be provided as a single layer or a plurality of layers.
- the hole transport material has either hole injection or transport or electron barrier properties, and may be either organic or inorganic.
- triazole derivatives oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives and pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives
- Examples thereof include stilbene derivatives, silazane derivatives, aniline copolymers, and conductive polymer oligomers, particularly thiophene oligomers.
- hole transport material those described above can be used, but it is preferable to use a porphyrin compound, an aromatic tertiary amine compound and a styrylamine compound, particularly an aromatic tertiary amine compound.
- aromatic tertiary amine compounds and styrylamine compounds include N, N, N ′, N′-tetraphenyl-4,4′-diaminophenyl; N, N′-diphenyl-N, N′— Bis (3-methylphenyl)-[1,1′-biphenyl] -4,4′-diamine (TPD); 2,2-bis (4-di-p-tolylaminophenyl) propane; 1,1-bis (4-di-p-tolylaminophenyl) cyclohexane; N, N, N ′, N′-tetra-p-tolyl-4,4′-diaminobiphenyl; 1,1-bis (4-di-p-tolyl) Aminophenyl) -4-phenylcyclohexane; bis (4-dimethylamino-2-methylphenyl) phenylmethane; bis (4-di-p-tolylaminoph
- a polymer material in which these materials are introduced into a polymer chain or these materials are used as a polymer main chain can also be used.
- inorganic compounds such as p-type-Si and p-type-SiC can also be used as the hole injection material and the hole transport material.
- JP-A-11-251067, J. Org. Huang et. al. A so-called p-type hole transport material described in a book (Applied Physics Letters 80 (2002), p. 139) can also be used. In the present invention, it is preferable to use these materials because a light-emitting element with higher efficiency can be obtained.
- the hole transport layer 5 is formed by thinning the hole transport material by a known method such as a vacuum deposition method, a spin coating method, a casting method, a printing method including an ink jet method, or an LB method. be able to.
- the film thickness of the hole transport layer 5 is not particularly limited, but is usually about 5 nm to 5 ⁇ m, preferably 5 to 200 nm.
- This hole transport layer may have a single layer structure composed of one or more of the above materials.
- anode As the anode (counter electrode) to be paired with the cathode, the materials described for the cathode constituting the above-described transparent conductivity may be used, or a metal, an alloy, an electrically conductive compound, or a mixture thereof is used as an electrode substance. Things can also be used.
- Electrode materials include sodium, sodium-potassium alloy, magnesium, lithium, silver, ITO (indium tin oxide), magnesium / copper mixture, magnesium / silver mixture, magnesium / aluminum mixture, magnesium / indium.
- examples include a mixture, an aluminum / aluminum oxide (Al 2 O 3 ) mixture, indium, a lithium / aluminum mixture, and a rare earth metal.
- the counter electrode can be produced by forming a thin film of these electrode materials by a method such as vapor deposition or sputtering.
- the sheet resistance as the counter electrode is preferably several hundred ⁇ / ⁇ or less, and the film thickness is usually selected in the range of 10 nm to 5 ⁇ m, preferably 50 to 200 nm.
- a support substrate (hereinafter also referred to as a base material, a substrate, a substrate, a support, etc.) that can be used in the organic EL element of the present invention include glass, plastic, and the like, but are not limited thereto. Further, the support substrate may be transparent or opaque. When light is extracted from the support substrate, the support substrate is preferably transparent. Examples of the transparent support substrate preferably used include glass, quartz, and a transparent resin film. A particularly preferable support substrate is a resin film capable of giving flexibility to the organic EL element 1A.
- polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyethylene, polypropylene, cellophane, cellulose diacetate, cellulose triacetate (TAC), cellulose acetate butyrate, cellulose acetate pro Cellulose esters such as pionate (CAP), cellulose acetate phthalate, cellulose nitrate or derivatives thereof, polyvinylidene chloride, polyvinyl alcohol, polyethylene vinyl alcohol, syndiotactic polystyrene, polycarbonate, norbornene resin, polymethylpentene, polyether Ketone, polyimide, polyethersulfone (PES), polyphenylene sulfide, poly Cycloolefins such as sulfones, polyether imides, polyether ketone imides, polyamides, fluororesins, nylon, polymethyl methacrylate, acrylics or polyarylates, Arton (trade name, manufactured by JSR)
- PET polyethylene
- the water vapor permeability (25 ⁇ 0.5 ° C.) measured by a method according to JIS K 7129-1992. And a relative humidity (90 ⁇ 2)% RH) of 0.01 g / (m 2 ⁇ 24 h) or less is preferably a barrier film (also referred to as a barrier film or the like), and further conforms to JIS K 7126-1987.
- the oxygen permeability measured by the above method is 10 ⁇ 3 ml / (m 2 ⁇ 24 h ⁇ atm) or less, and the water vapor permeability is 10 ⁇ 5 g / (m 2 ⁇ 24 h) or less. It is preferable.
- the material for forming the barrier film may be any material that has a function of suppressing intrusion of elements that cause deterioration of elements such as moisture and oxygen.
- silicon oxide, silicon dioxide, silicon nitride, or the like can be used.
- the method for forming the barrier film is not particularly limited.
- the vacuum deposition method, the sputtering method, the reactive sputtering method, the molecular beam epitaxy method, the cluster ion beam method, the ion plating method, the plasma polymerization method, the atmospheric pressure plasma weighting can be used, but an atmospheric pressure plasma polymerization method described in JP-A No. 2004-68143 is particularly preferable.
- the opaque support substrate examples include metal plates such as aluminum and stainless steel, films, opaque resin substrates, ceramic substrates, and the like.
- ⁇ Sealing> As a sealing means used for this invention, the method of adhere
- the sealing member may be disposed so as to cover the light emitting region of the organic EL element, and may be a concave plate shape or a flat plate shape. Further, transparency and electrical insulation are not particularly limited.
- the electrode may be provided on the sealing member and provided so as to be conductive with the organic EL element.
- the sealing member include a glass substrate, a polymer substrate / film, and a metal substrate / film.
- the glass substrate include soda-lime glass, barium / strontium-containing glass, lead glass, aluminosilicate glass, borosilicate glass, barium borosilicate glass, and quartz.
- the polymer substrate include polycarbonate, acrylic, polyethylene terephthalate, polyether sulfide, and polysulfone.
- the metal substrate include those made of one or more metals or alloys selected from the group consisting of stainless steel, iron, copper, aluminum, magnesium, nickel, zinc, chromium, titanium, molybdenum, silicon, germanium, and tantalum.
- a polymer film and a metal film can be preferably used because the element can be thinned.
- the polymer film has an oxygen permeability measured by a method according to JIS K 7126-1987 of 1 ⁇ 10 ⁇ 3 ml / (m 2 ⁇ 24 h ⁇ atm) or less, and a method according to JIS K 7129-1992. It is preferable that the water vapor permeability (25 ⁇ 0.5 ° C., relative humidity (90 ⁇ 2)% RH) measured in (1) is 1 ⁇ 10 ⁇ 3 g / (m 2 ⁇ 24 h) or less.
- sealing member For processing the sealing member into a concave shape, sandblasting, chemical etching, or the like is used.
- the adhesive include photocuring and thermosetting adhesives having reactive vinyl groups of acrylic acid oligomers and methacrylic acid oligomers, and moisture curing adhesives such as 2-cyanoacrylates. be able to.
- heat- and chemical-curing types such as epoxy type can be mentioned.
- hot-melt type polyamide, polyester, and polyolefin can be mentioned.
- a cationic curing type ultraviolet curing epoxy resin adhesive can be mentioned.
- the organic EL element 1A may be deteriorated by heat treatment, a material that can be adhesively cured from room temperature to 80 ° C. is preferable.
- a desiccant may be dispersed in the adhesive.
- Application of the adhesive to the sealing portion may be performed using a commercially available dispenser or may be printed like screen printing.
- the electrode and the organic layer are coated on the outer side of the electrode (cathode 8 in FIG. 1) on the side facing the support substrate 2 with the organic layer interposed therebetween, and inorganic and organic layers are formed in contact with the support substrate 2.
- a sealing film can also be suitably used.
- the material for forming the film may be a material having a function of suppressing intrusion of elements that cause deterioration of elements such as moisture and oxygen.
- silicon oxide, silicon dioxide, silicon nitride, or the like may be used. it can.
- the method for forming these films is not particularly limited.
- vacuum deposition, sputtering, reactive sputtering, molecular beam epitaxy, cluster ion beam, ion plating, plasma polymerization, atmospheric pressure plasma A combination method, a plasma CVD method, a laser CVD method, a thermal CVD method, a coating method, or the like can be used.
- an inert gas such as nitrogen or argon, or an inert liquid such as fluorinated hydrocarbon or silicon oil can be injected in the gas phase and liquid phase.
- an inert gas such as nitrogen or argon, or an inert liquid such as fluorinated hydrocarbon or silicon oil
- a vacuum is also possible.
- a hygroscopic compound can also be enclosed inside.
- hygroscopic compound examples include metal oxides (for example, sodium oxide, potassium oxide, calcium oxide, barium oxide, magnesium oxide, aluminum oxide) and sulfates (for example, sodium sulfate, calcium sulfate, magnesium sulfate, cobalt sulfate).
- metal oxides for example, sodium oxide, potassium oxide, calcium oxide, barium oxide, magnesium oxide, aluminum oxide
- sulfates for example, sodium sulfate, calcium sulfate, magnesium sulfate, cobalt sulfate.
- metal halides eg calcium chloride, magnesium chloride, cesium fluoride, tantalum fluoride, cerium bromide, magnesium bromide, barium iodide, magnesium iodide etc.
- perchloric acids eg perchloric acid Barium, magnesium perchlorate, and the like
- anhydrous salts are preferably used in sulfates, metal halides, and perchloric acids.
- a protective film or a protective plate may be provided in order to increase the mechanical strength of the element on the outside of the sealing film on the side facing the support substrate with the organic layer interposed therebetween or on the sealing film.
- the mechanical strength is not necessarily high, and thus it is preferable to provide such a protective film and a protective plate.
- the same glass substrate, polymer substrate / film, metal substrate / film, etc. as those used for the sealing can be used. Is preferably used.
- a thin film made of a desired electrode material for example, an anode material
- a suitable support substrate by a method such as vapor deposition or sputtering so as to have a film thickness of 1 ⁇ m or less, preferably 10 nm to 200 nm.
- a thin film containing an organic compound such as a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer, which is a device material, is formed thereon.
- a method for thinning a thin film containing an organic compound there are a spin coating method, a casting method, an ink jet method, a vapor deposition method, a printing method, and the like, but a homogeneous film is easily obtained and pinholes are not easily generated.
- the vacuum deposition method or the spin coating method is particularly preferable. Further, different film forming methods may be applied for each layer.
- the vapor deposition conditions vary depending on the type of compound used, but generally a boat heating temperature of 50 ° C. to 450 ° C., a degree of vacuum of 10 ⁇ 6 Pa to 10 ⁇ 2 Pa, a vapor deposition rate of 0. It is desirable to select appropriately within the range of 01 nm / second to 50 nm / second, substrate temperature ⁇ 50 ° C. to 300 ° C., and film thickness 0.1 ⁇ m to 5 ⁇ m.
- a desired organic EL device can be obtained by providing the cathode of the present invention thereon by vapor deposition.
- the cathode of the present invention it is possible to reverse the film formation order, and in this order, the cathode of the present invention, the electron transport layer, the light emitting layer, the hole transport layer, the hole injection layer, and the anode on the support substrate.
- a direct current voltage When a direct current voltage is applied to the organic EL device thus manufactured, light emission can be observed by applying a voltage of about 2V to 40V with the anode 3 being positive and the cathode being negative.
- An alternating voltage may be applied.
- the alternating current waveform to be applied may be arbitrary.
- the organic EL device of the present invention it is preferable to consistently produce from the hole injection layer to the cathode by one evacuation, but it may be taken out halfway and subjected to different film forming methods. At that time, it is necessary to consider that the work is performed in a dry inert gas atmosphere.
- the organic EL element of the present invention can be used as a surface light emitter as described above, but can also be used as a display device, a display, and various light emission sources.
- a light emitting light source for example, lighting devices such as home lighting and interior lighting, backlights for clocks and liquid crystals, billboard advertisements, traffic lights, light sources of optical storage media, light sources of electrophotographic copying machines, light sources of optical communication processors, Examples include, but are not limited to, a light source of an optical sensor, and the light source can be effectively used for a backlight of a liquid crystal display device combined with a color filter and a light source for illumination.
- the organic EL element of the present invention may be used as a kind of lamp for illumination or exposure light source, a projection device for projecting an image, or a type for directly viewing a still image or a moving image. It may be used as a display device (display).
- the drive method when used as a display device for moving image reproduction may be either a simple matrix (passive matrix) method or an active matrix method.
- a full-color display device can be manufactured by using two or more organic EL elements of the present invention having different emission colors.
- the illuminating device of this invention has the said organic EL element.
- the illuminating device of this invention may use the illuminating device of this invention as an organic EL element which gave the resonator structure to the said organic EL element.
- Examples of the purpose of use of the organic EL element having such a resonator structure include a light source of an optical storage medium, a light source of an electrophotographic copying machine, a light source of an optical communication processing machine, and a light source of an optical sensor. It is not limited. Moreover, you may use for the said use by making a laser oscillation.
- the material used for the organic EL element of the present invention can be applied to an organic EL element that generates white light emission (also referred to as a white organic EL element).
- a plurality of light emitting colors can be simultaneously emitted by a plurality of light emitting materials to obtain white light emission by color mixing.
- the combination of a plurality of emission colors may include three emission maximum wavelengths of the three primary colors of red, green and blue, or two using the complementary colors such as blue and yellow, blue green and orange. The thing containing the light emission maximum wavelength may be used.
- the combination of luminescent materials for obtaining multiple luminescent colors is a combination of multiple phosphorescent or fluorescent materials that emit light, fluorescent materials or phosphorescent materials, and light from the luminescent materials. Any combination with a pigment material that emits light as light may be used, but in a white organic EL element, a combination of a plurality of light-emitting dopants may be used.
- an electrode film can be formed by a vapor deposition method, a cast method, a spin coating method, an ink jet method, a printing method, or the like, and productivity is also improved. According to this method, unlike a white organic EL device in which light emitting elements of a plurality of colors are arranged in parallel in an array, the organic EL element itself emits white light.
- luminescent material used for a light emitting layer For example, if it is a backlight in a liquid crystal display element, the metal complex which concerns on this invention so that it may suit the wavelength range corresponding to CF (color filter) characteristic, Any one of known luminescent materials may be selected and combined to whiten.
- CF color filter
- the white organic EL element described above it is possible to produce a lighting device that emits white light.
- FIG. 3 is a schematic cross-sectional view showing one embodiment of the lighting device of the present invention.
- the lighting device 20 of the present invention includes an organic EL element 1 ⁇ / b> A (1 ⁇ / b> B) including a support substrate 2 on which an anode is formed, a light emitting layer 6, and a cathode 8.
- an epoxy photo-curing adhesive (Lux Track LC0629B manufactured by Toagosei Co., Ltd.).
- the organic EL element 1A (1B) fixed to the glass substrate 21 is sealed with a glass substrate 21, a glass case 22, and a sealing material 23.
- the sealing material 23 the same material used for fixing the organic EL element 1A (1B) can be used.
- the inside of the glass case 22 is filled with nitrogen gas 24 so that the organic EL element 1A (1B) is not brought into contact with the atmosphere. Therefore, it is preferable to perform the sealing operation in the glass case 22 in a glove box under a nitrogen atmosphere (in an atmosphere of high-purity nitrogen gas having a purity of 99.999% or more).
- a hygroscopic compound 25 is provided inside the glass case 22.
- Organic EL elements 1 to 63 shown in Tables 1 to 3 were fabricated so that the light emitting area was 5 cm ⁇ 5 cm.
- each tantalum resistance heating boat is provided with the following HI-1, HI-2, ⁇ -NPD, compound H4 (hereinafter simply referred to as H4).
- Compound Ir-4 (hereinafter, simply referred to as Ir-4), BAlq, Alq 3 , lithium quinolate, lithium fluoride, and potassium fluoride were charged and attached to the first vacuum chamber of the vacuum deposition apparatus.
- the structures of ⁇ -NPD, BAlq, and Alq 3 are as follows. Thereafter, in the production of the organic EL elements 2 to 63, necessary materials were exchanged in advance and set on a resistance heating boat made of tantalum.
- silver was put into a resistance heating boat made of tungsten, and indium was put into a resistance heating boat made of molybdenum, respectively, and attached to the second vacuum tank of the vacuum evaporation apparatus.
- the heating boat containing HI-1 and HI-2 is heated by heating, and HI-1 and HI-2 are respectively deposited at a deposition rate.
- the current was controlled so as to be 0.05 nm / second, and a hole injection layer having a total thickness of 20 nm was provided on the ITO layer.
- the heating boat containing ⁇ -NPD was energized and heated to provide a 20 nm-thick hole transport layer on the ITO layer at a deposition rate of 0.1 to 0.2 nm / second.
- the heating boat containing H4 and the heating boat containing Ir-4 are energized independently so that the deposition rate of H4 as a light emitting host and Ir-4 as a light emitting dopant becomes 100: 6. And a light emitting layer having a thickness of 30 nm was provided.
- the heating boat containing BAlq was energized and heated to provide a 10 nm thick hole blocking layer at a deposition rate of 0.1 to 0.2 nm / second.
- the heating boat containing Alq 3 was heated by energization to provide an electron transport layer having a film thickness of 20 nm at a deposition rate of 0.1 to 0.2 nm / second.
- the heating boat containing lithium fluoride was energized and heated to provide an electron injection layer having a thickness of 1 nm at a deposition rate of 0.01 to 0.02 nm / second.
- An organic EL element 3 was produced in the same manner as the organic EL element 1 except that the film thickness of the cathode was changed from 10 nm to 8 nm with respect to the organic EL element 1. The obtained organic EL element 3 was sealed in the same manner as the organic EL element 1, and the organic EL element 3 was obtained.
- the obtained device was moved again to the first vacuum trough, heated by energizing the heating boat containing Alq 3 , and an adjacent layer having a film thickness of 15 nm at a deposition rate of 0.1 to 0.2 nm / second.
- the organic EL element 4 was produced.
- the obtained organic EL element 4 was sealed in the same manner as the organic EL element 1, and the organic EL element 4 was obtained.
- Organic EL elements 5 to 8 were produced in the same manner as the organic EL element 4 except that the film thickness of the adjacent layer was changed from 15 nm to 30 nm, 50 nm, 80 nm, and 100 nm with respect to the organic EL element 4. The obtained organic EL elements 5 to 8 were sealed in the same manner as the organic EL element 1 to obtain organic EL elements 5 to 8.
- Organic EL elements 9 and 10 were produced in the same manner as the organic EL element 8 except that the cathode film thickness was changed from 8 nm to 15 nm and 20 nm with respect to the organic EL element 8. The obtained organic EL elements 9 and 10 were sealed in the same manner as the organic EL element 1 to obtain organic EL elements 9 and 10.
- Organic EL elements 11 to 15 were fabricated in the same manner as the organic EL element 4 except that the film thickness of the adjacent layer was changed from 15 nm to 120 nm, 150 nm, 180 nm, 210 nm, and 240 nm with respect to the organic EL element 4. The obtained organic EL elements 11 to 15 were sealed in the same manner as the organic EL element 1 to obtain organic EL elements 11 to 15.
- An organic EL element 16 was produced in the same manner as the organic EL element 1 except that the thickness of the cathode was changed from 10 nm to 4 nm with respect to the organic EL element 1. The obtained organic EL element 16 was sealed in the same manner as the organic EL element 1, and the organic EL element 16 was obtained.
- the obtained device was moved again to the first vacuum trough, heated by energizing the heating boat containing Alq 3 , and an adjacent layer having a film thickness of 100 nm at a deposition rate of 0.1 to 0.2 nm / second.
- the organic EL element 17 was produced.
- the obtained organic EL element 17 was sealed in the same manner as the organic EL element 1, and the organic EL element 17 was obtained.
- Organic EL element 18 was produced in the same manner as the organic EL element 2 except that the thickness of the cathode was changed from 10 nm to 1.8 nm with respect to the organic EL element 2. The obtained organic EL element 18 was sealed in the same manner as the organic EL element 1, and the organic EL element 18 was obtained.
- the element formed up to the electron injection layer was transferred to the second vacuum chamber while being vacuumed, and after the second vacuum chamber was depressurized to 4 ⁇ 10 ⁇ 4 Pa, the heating boat containing silver and the heating boat containing indium And an organic EL element 19 is formed by adjusting the deposition rate so that the atomic ratio of indium (atm%) is 5%, forming an electrode layer made of silver and indium with a total film thickness of 10 nm. Produced.
- the obtained organic EL element 19 was sealed in the same manner as the organic EL element 1, and the organic EL element 19 was obtained.
- the obtained device was moved again to the first vacuum trough, heated by energizing the heating boat containing Alq 3 , and an adjacent layer having a film thickness of 100 nm at a deposition rate of 0.1 to 0.2 nm / second.
- the organic EL element 20 was produced.
- the obtained organic EL element 20 was sealed in the same manner as the organic EL element 1, and the organic EL element 20 was obtained.
- An organic EL element 21 was produced in the same manner as the organic EL element 19 except that the film thickness of the cathode was changed from 10 nm to 8 nm with respect to the organic EL element 19. The obtained organic EL element 21 was sealed in the same manner as the organic EL element 1, and the organic EL element 21 was obtained.
- the obtained device was moved again to the first vacuum trough, heated by energizing the heating boat containing Alq 3 , and an adjacent layer having a film thickness of 15 nm at a deposition rate of 0.1 to 0.2 nm / second.
- the organic EL element 22 was produced.
- the obtained organic EL element 22 was sealed in the same manner as the organic EL element 1, and the organic EL element 22 was obtained.
- An organic EL element 32 was produced in the same manner as the organic EL element 22 except that the compound forming the adjacent layer was changed from Alq 3 to the compound 10 with respect to the organic EL element 22. Further, only the film of the compound 10 was separately formed on a quartz substrate, and the organic EL element 32 was produced. The film thickness was 50 nm, and the refractive index of the obtained film was measured by spectroscopic ellipsometry. The obtained organic EL element 32 was sealed in the same manner as the organic EL element 1, and the organic EL element 32 was obtained.
- An organic EL element 42 was produced in the same manner as the organic EL element 36 except that the film thickness of the cathode was changed from 10 nm to 1.8 nm with respect to the organic EL element 36.
- the obtained organic EL element 42 was sealed in the same manner as the organic EL element 1, and the organic EL element 42 was obtained.
- the obtained organic EL element 43 was sealed in the same manner as the organic EL element 1, and the organic EL element 43 was obtained.
- Organic EL Element 45 For the organic EL element 8, the compound of the electron injection layer was changed from lithium fluoride to potassium fluoride, the thickness of the electron injection layer was changed from 1 nm to 2 nm, and the compound forming the adjacent layer was changed from Alq 3 to Compound 10. Produced an organic EL element 45 in the same manner as the organic EL element 8. The obtained organic EL element 45 was sealed in the same manner as the organic EL element 1, and the organic EL element 45 was obtained.
- Organic EL Element 46 For the organic EL element 36, the organic EL element 46 was changed in the same manner as the organic EL element 36 except that the compound of the electron injection layer was changed from lithium fluoride to potassium fluoride and the film thickness of the electron injection layer was changed from 1 nm to 2 nm. Produced. The obtained organic EL element 46 was sealed in the same manner as the organic EL element 1, and the organic EL element 46 was obtained.
- organic EL element 47 An organic EL element 47 was produced in the same manner as the organic EL element 46 except that the material constituting the cathode was changed from silver and indium to silver and magnesium. The obtained organic EL element 47 was sealed in the same manner as the organic EL element 1, and the organic EL element 47 was obtained.
- Organic EL element 48 was produced in the same manner as the organic EL element 45 except that the material constituting the electron transport layer was changed from Alq 3 to the compound 94 for the organic EL element 45. The obtained organic EL element 48 was sealed in the same manner as the organic EL element 1, and the organic EL element 48 was obtained.
- An organic EL element 49 was produced in the same manner as the organic EL element 46 except that the material constituting the electron transport layer was changed from Alq 3 to the compound 94 for the organic EL element 46. The obtained organic EL element 49 was sealed in the same manner as the organic EL element 1, and the organic EL element 49 was obtained.
- Organic EL Element 50 For the organic EL element 47, an organic EL element 50 was produced in the same manner as the organic EL element 47 except that the material constituting the electron transport layer was changed from Alq 3 to the compound 94. The obtained organic EL element 50 was sealed in the same manner as the organic EL element 1, and the organic EL element 50 was obtained.
- Organic EL element 51 was produced in the same manner as the organic EL element 48 except that the material constituting the electron transport layer was changed from the compound 94 to the compound 10 with respect to the organic EL element 48. The obtained organic EL element 51 was sealed in the same manner as the organic EL element 1, and the organic EL element 51 was obtained.
- An organic EL element 52 was produced in the same manner as the organic EL element 49 except that the material constituting the electron transport layer was changed from the compound 94 to the compound 10 with respect to the organic EL element 49.
- the obtained organic EL element 52 was sealed in the same manner as the organic EL element 1, and the organic EL element 52 was obtained.
- An organic EL element 53 was produced in the same manner as the organic EL element 50 except that the material constituting the electron transport layer was changed from the compound 94 to the compound 10 for the organic EL element 50.
- the obtained organic EL element 53 was sealed in the same manner as the organic EL element 1, and the organic EL element 53 was obtained.
- An organic EL element 55 was produced in the same manner as the organic EL element 54 except that the material constituting the cathode was changed from silver to silver and indium for the organic EL element 54.
- the obtained organic EL element 55 was sealed in the same manner as the organic EL element 1, and the organic EL element 55 was obtained.
- Organic EL Element 56 For the organic EL element 54, an organic EL element 56 was produced in the same manner as the organic EL element 54 except that the material constituting the cathode was changed from silver to silver and magnesium. The obtained organic EL element 56 was sealed in the same manner as the organic EL element 1, and the organic EL element 56 was obtained.
- Organic EL element 57 was produced in the same manner as the organic EL element 54 except that the emission dopant was changed from Ir-4 to Ir-26 for the organic EL element 54. The obtained organic EL element 57 was sealed in the same manner as the organic EL element 1, and the organic EL element 57 was obtained.
- Organic EL element 58 was produced in the same manner as the organic EL element 55 except that the emission dopant was changed from Ir-4 to Ir-26 for the organic EL element 55. The obtained organic EL element 58 was sealed in the same manner as the organic EL element 1, and the organic EL element 58 was obtained.
- Organic EL element 59 was produced in the same manner as the organic EL element 56 except that the emission dopant was changed from Ir-4 to Ir-26 for the organic EL element 56. The obtained organic EL element 59 was sealed in the same manner as the organic EL element 1, and the organic EL element 59 was obtained.
- an auxiliary electrode composed of a line-shaped silver pattern was formed by a vapor deposition method using a shadow mask at intervals of a line width of 50 ⁇ m, a thickness of 1 ⁇ m, and a pitch of 1 mm.
- the obtained device is again moved to the first vacuum trough, and the heating boat containing the compound 10 is energized and heated to form a 100 nm thick layer at a deposition rate of 0.1 to 0.2 nm / second.
- An organic EL element 60 was prepared.
- the obtained organic EL element 60 was sealed in the same manner as the organic EL element 1, and the organic EL element 60 was obtained.
- Organic EL Element 61 For the organic EL element 60, an organic EL element 61 was produced in the same manner as the organic EL element 60 except that the material constituting the cathode was changed from silver to silver and indium. The obtained organic EL element 61 was sealed in the same manner as the organic EL element 1, and the organic EL element 61 was obtained.
- Organic EL Element 62 For the organic EL element 60, an organic EL element 62 was produced in the same manner as the organic EL element 60 except that the material constituting the cathode was changed from silver to silver and magnesium. The obtained organic EL element 62 was sealed in the same manner as the organic EL element 1, and the organic EL element 62 was obtained.
- Organic EL element 63 was produced in the same manner as the organic EL element 60 except that the material constituting the adjacent layer was changed from the compound 10 to the comparative compound 1 with respect to the organic EL element 60. The obtained organic EL element 63 was sealed in the same manner as the organic EL element 1, and the organic EL element 63 was obtained.
- the cathodes of all organic EL elements had a light transmittance of 50% or more at a wavelength of 550 nm.
- the element formed into a film to the adjacent layer of each organic EL element was produced separately, and as a result of observing the state of the adjacent layer, the adjacent layer formed using Alq 3 , Liq, and compound 10 has light scattering properties.
- the adjacent particulate layer formed using the comparative compound 1 was observed to be particulate having light scattering properties.
- Tables 1, 2, and 3 show the evaluation results obtained as described above.
- the organic EL device of the present invention has a lower driving voltage and excellent luminous efficiency than the organic EL device of the comparative example.
- the organic EL elements 32 to 39 containing the compound 10 in the adjacent layer have high luminous efficiency, and are excellent when the film thickness of the adjacent layer is about 50 to 150 nm.
- the organic EL elements 54 to 62 using potassium fluoride for the electron injection layer are further excellent in luminous efficiency.
- top emission type organic EL elements A 1 ⁇ m-thick SiO 2 film was formed by sputtering on the entire surface of a 50 ⁇ m-thick metal foil made of SUS304, and an aluminum neodymium alloy film having a desired thickness of 100 nm was further formed by sputtering to form an anode. Except for the above, a top emission type organic EL device was produced in the same manner as the above-described double-sided emission type organic EL device, and the effect of the present invention was confirmed.
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Abstract
Description
〔式中、n1は1以上の整数を表し、Y1はn1が1の場合は置換基を表し、n1が2以上の場合は単なる結合手またはn1価の連結基を表す。Ar1は下記一般式(A)で表される基を表し、n1が2以上の場合、複数のAr1は同一でも異なっていてもよい。但し、前記一般式(1)で表される化合物は分子内に3環以上の環が縮合してなる縮合芳香族複素環を少なくとも2つ有する。〕
4.前記一般式(1)で表される化合物が、下記一般式(2)で表される化合物であることを特徴とする前記3に記載の有機エレクトロルミネッセンス素子。
5.前記一般式(2)で表される化合物が、下記一般式(3)で表される化合物であることを特徴とする前記4に記載の有機エレクトロルミネッセンス素子。
6.前記カソードの主成分が銀であることを特徴とする前記1~5のいずれか1項に記載の有機エレクトロルミネッセンス素子。
11.前記一般式(4)で表される化合物が、下記一般式(5)で表される化合物であることを特徴とする前記10に記載の有機エレクトロルミネッセンス素子。
12.前記M1がイリジウムを表すことを特徴とする前記10または11に記載の有機エレクトロルミネッセンス素子。
はじめに、本発明の有機エレクトロルミネッセンス素子(有機EL素子)の層構成の好ましい具体例を説明する。
(i)支持基板2/アノード3/正孔注入層4/正孔輸送層5/発光層6/電子輸送層7/カソード8/隣接層を挙げることができる。
(iii)支持基板/アノード/正孔注入層/正孔輸送層/発光層/正孔阻止層/電子輸送層/カソード/隣接層
(iv)支持基板/アノード/正孔注入層/正孔輸送層/第1発光層/第2発光層/電子輸送層/電子注入層/カソード/隣接層
(v)支持基板/アノード/正孔注入層/正孔輸送層/第1発光層/第2発光層/第3発光層/電子輸送層/電子注入層/カソード/隣接層
(vi)支持基板/アノード/正孔注入層/正孔輸送層/第1発光層/第2発光層/正孔阻止層/電子輸送層/電子注入層/カソード/隣接層
(vii)支持基板/補助電極層/アノード/正孔注入層/正孔輸送層/第1発光層/電化発生層/第2発光層/正孔阻止層/電子輸送層/電子注入層/カソード/隣接層
各層の詳しい説明は後述する。
本発明におけるカソード(カソード電極、陰極等ともいう)は、前記したように、導電性を有する金属を含有する薄膜なら特に制限はなく、含有する金属としては、アルミニウム、銀、金、白金、銅、スズ、インジウム、マグネシウム、亜鉛、ゲルマニウム、ビスマス、ストロンチウム、バリウム等が挙げられ、さらにはこれらの金属どうし、または他の金属との2種以上の混合物(合金)であってもよく、またこれらの金属もしくは合金と、有機化合物との共蒸着等によって形成される薄膜であってもよく、電極として機能するものである。
カソードの発光層とは反対側に隣接する隣接層は、屈折率が1.6以上、1.95以下、かつ膜厚が15nm以上、180nm以下であれば特に制限はないが、好ましくは30nm以上150nm以下であり、より好ましくは50nm以上120nm以下である。隣接層は、350nm以上800nm以下の領域で該屈折率を満たすものが好ましい。隣接層は、好ましくは金属錯体化合物または前記一般式(1)で表される化合物を含有することが好ましい。隣接層は光散乱粒子を含有しないことを特徴とする。
本発明に係る一般式(1)で表される化合物について説明する。
一般式(1)において、Ar1は、下記一般式(A)で表される基を表す。
一般式(A)において、Y3で表される基としては、上記6員の芳香族環から導出される基であることが好ましく、更に好ましくは、ベンゼン環から導出される基である。
一般式(A)において、Y4で表される基としては、上記6員の芳香族環から導出される基であることが好ましく、更に好ましくは、窒素原子を環構成原子と含む芳香族複素環から導出される基であり、特に好ましくは、Y4がピリジン環から導出される基であることである。
一般式(A)で表される基の好ましい態様としては、下記一般式(A-1)、(A-2)、(A-3)または(A-4)のいずれかで表される基が挙げられる。
本発明では、上記一般式(1)で表される化合物の中でも、下記一般式(2)で表される化合物が好ましい。以下、一般式(2)で表される化合物について説明する。
本発明では、上記一般式(2)で表される化合物の中でも、更に下記一般式(3)で表される化合物が好ましい。以下、一般式(3)で表される化合物について説明する。
窒素雰囲気下、3,6-ジブロモジベンゾフラン(1.0モル)、カルバゾール(2.0モル)、銅粉末(3.0モル)、炭酸カリウム(1.5モル)をDMAc(ジメチルアセトアミド)300ml中に混合し、130℃で24時間撹拌した。反応液を室温まで冷却後、トルエン1lを加え、蒸留水で3回洗浄し、有機層を減圧下に溶媒を留去し、残渣をシリカゲルフラッシュクロマトグラフィー(n-ヘプタン:トルエン=4:1~3:1)にて精製し、中間体1を収率85%で得た。
室温、大気下で中間体1(0.5モル)をDMF100mlに溶解し、NBS(2.0モル)を加え、一晩室温で撹拌した。得られた沈殿を濾過し、メタノールで洗浄し、中間体2を収率92%で得た。
窒素雰囲気下、中間体2(0.25モル)、2-フェニルピリジン(1.0モル)、ルテニウム錯体[(η6-C6H6)RuCl2]2(0.05モル)、トリフェニルホスフィン(0.2モル)、炭酸カリウム(12モル)をNMP(N-メチル-2-ピロリドン)3l中で混合し、140℃で一晩撹拌した。
なお、本発明では図2に示すように、カソード8と隣接層9との間に抵抗を下げる目的で補助電極8-1を設けた有機EL素子1Bとすることもできる。
本発明においては、カソードと発光層の間に、さらに電子輸送性化合物を含む電子輸送層を有していることが好ましい。
本発明で用いられる発光層は、発光材料として燐光発光化合物、及び/または蛍光発光化合物が含有されている。
有機EL素子1Aの発光層に含有されるホスト化合物としては、室温(25℃)における燐光発光の燐光量子収率が0.1未満の化合物が好ましい。さらに好ましくは燐光量子収率が0.01未満である。また、発光層6に含有される化合物の中で、その層中での体積比が50%以上であることが好ましい。
本発明で用いることのできる発光材料としては、燐光発光性化合物(燐光性化合物、燐光発光材料ともいう)が挙げられる。
発光層に含まれる化合物(燐光発光性化合物)は、下記一般式(4)で表される化合物であることが好ましい。
一般式(4)で表される化合物の中でも、下記一般式(5)で表される化合物であることがさらに好ましい。
上記一般式(5)で表される化合物の好ましい態様のひとつとして、下記一般式(6)で表される化合物が挙げられる。
蛍光発光材料としては、クマリン系色素、ピラン系色素、シアニン系色素、クロコニウム系色素、スクアリウム系色素、オキソベンツアントラセン系色素、フルオレセイン系色素、ローダミン系色素、ピリリウム系色素、ペリレン系色素、スチルベン系色素、ポリチオフェン系色素、または希土類錯体系蛍光体等が挙げられる。
阻止層は、上記の如く有機化合物薄膜の基本構成層の他に、必要に応じて設けられるものである。例えば、特開平11-204258号公報、同11-204359号公報、及び「有機EL素子とその工業化最前線(1998年11月30日エヌ・ティー・エス社発行)」の237頁等に記載されている正孔阻止(ホールブロック)層がある。
注入層とは、駆動電圧低下や発光輝度向上のために電極と有機層(発光層)の間に設けられる層のことで、「有機EL素子とその工業化最前線(1998年11月30日エヌ・ティー・エス社発行)」の第2編第2章「電極材料」(123~166頁)に詳細に記載されており、正孔注入層(図1参照)と電子注入層とがある。
正孔輸送層は、正孔を輸送する機能を有する正孔輸送材料からなり、広い意味で正孔注入層、電子阻止層も正孔輸送層に含まれる。正孔輸送層は単層または複数層設けることができる。
カソードと対になるアノード(対向電極)としては、前述の透明導電性を構成するカソードで説明した材料を用いてもよいし、金属、合金、電気伝導性化合物及びこれらの混合物を電極物質とするものを用いることもできる。
本発明の有機EL素子に用いることのできる支持基板(以下、基材、基体、基板、支持体等とも言う。)としては、ガラス、プラスチック等を挙げることができるが、これらに限定されない。また、支持基板は透明であっても不透明であってもよい。支持基板から光を取り出す場合には、支持基板は透明であることが好ましい。好ましく用いられる透明な支持基板としては、ガラス、石英、透明樹脂フィルムを挙げることができる。特に好ましい支持基板は、有機EL素子1Aにフレキシブル性を与えることが可能な樹脂フィルムである。
本発明に用いられる封止手段としては、例えば、封止部材と電極、支持基板2とを接着剤で接着する方法を挙げることができる。
有機層を挟み支持基板と対向する側の前記封止膜、あるいは前記封止用フィルムの外側、素子の機械的強度を高めるために保護膜、あるいは保護板を設けてもよい。特に封止が前記封止膜により行われている場合には、その機械的強度は必ずしも高くないため、このような保護膜、保護板を設けることが好ましい。これに使用することができる材料としては、前記封止に用いたのと同様なガラス基板、ポリマ基板・フィルム、金属基板・フィルム等を用いることができるが、軽量且つ薄膜化ということからポリマーフィルムを用いることが好ましい。
本発明の有機EL素子の製造方法の一例として、図1に示す支持基板/アノード/正孔注入層/正孔輸送層/発光層/電子輸送層/カソードからなる有機EL素子の製造方法について説明する。
本発明の有機EL素子は、前述したように面発光体として用いることができるが、これの他にも表示デバイス、ディスプレイ、各種発光光源として用いることができる。発光光源として、例えば、家庭用照明や車内照明等の照明装置、時計や液晶用のバックライト、看板広告、信号機、光記憶媒体の光源、電子写真複写機の光源、光通信処理機の光源、光センサーの光源等が挙げられるがこれに限定するものではなく、特にカラーフィルターと組み合わせた液晶表示装置のバックライト、照明用光源としての用途に有効に用いることができる。
本発明の照明装置は、上記有機EL素子を有する。
本発明の有機EL素子を備えた、本発明の照明装置の一態様について説明する。なお、図3は、本発明の照明装置の一態様を示す概略断面図である。
表1~3に示す有機EL素子1~63を発光面積が5cm×5cmとなるように作製した。
(アノードの形成)
透明なガラス製の支持基板の上に厚さ100nmとなる条件でITOをスパッタ法で成膜した後、パターニングを行い、ITO層から成るアノード(陽極)を形成した。次いで、ITO層を設けた基板を、イソプロピルアルコールで超音波洗浄し、乾燥窒素ガスで乾燥し、UVオゾン洗浄を5分間行った。
このITO層を設けた支持基板を市販の真空蒸着装置の基板ホルダーに固定し、各タンタル製抵抗加熱ボートに下記HI-1、HI-2、α-NPD、化合物H4(以下、単にH4という)、化合物Ir-4(以下、単にIr-4という)、BAlq、Alq3、リチウムキノラート、フッ化リチウム、フッ化カリウムをそれぞれ入れ、真空蒸着装置の第1真空槽に取り付けた。なお、α-NPD、BAlq及びAlq3の構造は以下のとおりである。以降、有機EL素子2~63の作製においては、適時、必要な材料を予め交換し、タンタル製抵抗加熱ボートにセットしておいた。
次に、電子注入層まで成膜した素子を真空のまま第2真空槽に移し、第2真空槽を4×10-4Paまで減圧した後、銀の入った前記加熱ボートに通電して、膜厚10nmの銀からなる電極層を形成してカソードを得、有機EL素子1を作製した。
最後に上記で得られた有機EL素子1の、取り出し電極部が露出する大きさに裁断した、厚さ0.7mmの封止用無アルカリガラスの全面に、住友スリーエム株式会社製のエポキシ型接着剤、スコッチウェルドEW2083(商品名)を塗布し、中に気泡が入らないように加圧密着貼合した後、85℃60分加熱し、封止し、有機EL素子1を作製した。
(アノード~カソードの形成)
アノード~カソードまでは有機EL素子1と同様な方法で形成した。
次に、得られた素子を再び第1真空糟に移動し、Alq3の入った前記加熱ボートを通電して加熱し、蒸着速度0.1~0.2nm/秒で膜厚100nmの隣接層を形成して有機EL素子2を得た。
得られた有機EL素子2を有機EL素子1と同様にして封止し、有機EL素子2を得た。
有機EL素子1に対し、カソードの膜厚を10nmから8nmに変更した以外は有機EL素子1と同様にして有機EL素子3を作製した。得られた有機EL素子3を有機EL素子1と同様にして封止し、有機EL素子3を得た。
(アノード~カソードの形成)
アノード~カソードまでは有機EL素子3と同様な方法で形成した。
次に、得られた素子を再び第1真空糟に移動し、Alq3の入った前記加熱ボートを通電して加熱し、蒸着速度0.1~0.2nm/秒で膜厚15nmの隣接層を設け、有機EL素子4を作製した。得られた有機EL素子4を有機EL素子1と同様にして封止し、有機EL素子4を得た。
有機EL素子4に対し、隣接層の膜厚を15nmから30nm、50nm、80nm、100nmに変更した以外は有機EL素子4と同様にして有機EL素子5~8を作製した。得られた有機EL素子5~8を有機EL素子1と同様にして封止し、有機EL素子5~8を得た。
有機EL素子8に対し、カソードの膜厚を8nmから15nm、20nmに変更した以外は有機EL素子8と同様にして有機EL素子9、10を作製した。得られた有機EL素子9、10を有機EL素子1と同様にして封止し、有機EL素子9、10を得た。
有機EL素子4に対し、隣接層の膜厚を15nmから120nm、150nm、180nm、210nm、240nmに変更した以外は有機EL素子4と同様にして有機EL素子11~15を作製した。得られた有機EL素子11~15を有機EL素子1と同様にして封止し、有機EL素子11~15を得た。
有機EL素子1に対し、カソードの膜厚を10nmから4nmに変更した以外は有機EL素子1と同様にして有機EL素子16を作製した。得られた有機EL素子16を有機EL素子1と同様にして封止し、有機EL素子16を得た。
(アノード~カソードの形成)
アノード~カソードまでは有機EL素子16と同様な方法で形成した。
次に、得られた素子を再び第1真空糟に移動し、Alq3の入った前記加熱ボートを通電して加熱し、蒸着速度0.1~0.2nm/秒で膜厚100nmの隣接層を設け、有機EL素子17を作製した。得られた有機EL素子17を有機EL素子1と同様にして封止し、有機EL素子17を得た。
有機EL素子2に対し、カソードの膜厚を10nmから1.8nmに変更した以外は有機EL素子2と同様にして有機EL素子18を作製した。得られた有機EL素子18を有機EL素子1と同様にして封止し、有機EL素子18を得た。
(アノード~電子注入層の形成)
アノード~電子注入層までは有機EL素子1と同様な方法で形成した。
電子注入層まで成膜した素子を真空のまま第2真空槽に移し、第2真空槽を4×10-4Paまで減圧した後、銀の入った前記加熱ボートとインジウムの入った前記加熱ボートをそれぞれ独立に通電して、インジウムの原子比率(atm%)が5%になるように蒸着速度を調整し、合計膜厚10nmの銀とインジウムからなる電極層を形成し、有機EL素子19を作製した。得られた有機EL素子19を有機EL素子1と同様にして封止し、有機EL素子19を得た。
(アノード~カソードの形成)
アノード~カソードまでは有機EL素子19と同様な方法で形成した。
次に、得られた素子を再び第1真空糟に移動し、Alq3の入った前記加熱ボートを通電して加熱し、蒸着速度0.1~0.2nm/秒で膜厚100nmの隣接層を設け、有機EL素子20を作製した。得られた有機EL素子20を有機EL素子1と同様にして封止し、有機EL素子20を得た。
有機EL素子19に対し、カソードの膜厚を10nmから8nmに変更した以外は有機EL素子19と同様にして有機EL素子21を作製した。得られた有機EL素子21を有機EL素子1と同様にして封止し、有機EL素子21を得た。
(アノード~カソードの形成)
アノード~カソードまでは有機EL素子21と同様な方法で形成した。
次に、得られた素子を再び第1真空糟に移動し、Alq3の入った前記加熱ボートを通電して加熱し、蒸着速度0.1~0.2nm/秒で膜厚15nmの隣接層を設け、有機EL素子22を作製した。得られた有機EL素子22を有機EL素子1と同様にして封止し、有機EL素子22を得た。
有機EL素子22に対し、隣接層の膜厚を15nmから30nm、50nm、80nm、100nm、120nm、150nm、180nm、210nm、240nmに変更した以外は有機EL素子22と同様にして有機EL素子23~31を作製した。得られた有機EL素子23~31を有機EL素子1と同様にして封止し、有機EL素子23~31を得た。
有機EL素子22に対し、隣接層を形成する化合物をAlq3から化合物10に変更した以外は有機EL素子22と同様にして有機EL素子32を作製した。また、化合物10の膜のみを別途石英基板上に成膜し、有機EL素子32を作製した。膜厚は50nmとし、得られた膜の屈折率を、分光エリプソメトリー法により測定した。得られた有機EL素子32を有機EL素子1と同様にして封止し、有機EL素子32を得た。
有機EL素子32に対し、隣接層の膜厚を15nmから30nm、50nm、80nm、100nm、120nm、150nm、180nm、210nm、240nmに変更した以外は有機EL素子32と同様にして有機EL素子33~41を作製した。得られた有機EL素子33~41を有機EL素子1と同様にして封止し、有機EL素子33~41を得た。
有機EL素子36に対し、カソードの膜厚を10nmから1.8nmに変更した以外は有機EL素子36と同様にして有機EL素子42を作製した。得られた有機EL素子42を有機EL素子1と同様にして封止し、有機EL素子42を得た。
(アノード~カソードの形成)
アノード~カソードまでは有機EL素子3と同様な方法で形成した。
カソードを形成した素子を真空のままプラズマCVD装置内に移し、成膜速度が0.3~0.6nm/秒になるように印加電圧を調整し、膜厚100nmのSiO2から成る層を形成し、有機EL素子43を作製した。
(アノード~カソードの形成)
アノード~カソードまでは有機EL素子3と同様な方法で形成した。
次に、得られた素子を再び第1真空糟に移動し、リチウムキノラート(Liq)の入った前記加熱ボートを通電して加熱し、蒸着速度0.1~0.2nm/秒で膜厚100nmの隣接層を設け、有機EL素子44を作製した。
有機EL素子8に対し、電子注入層の化合物をフッ化リチウムからフッ化カリウムに、電子注入層の膜厚を1nmから2nmに、隣接層を形成する化合物をAlq3から化合物10に変更した以外は有機EL素子8と同様にして有機EL素子45を作製した。得られた有機EL素子45を有機EL素子1と同様にして封止し、有機EL素子45を得た。
有機EL素子36に対し、電子注入層の化合物をフッ化リチウムからフッ化カリウムに、電子注入層の膜厚を1nmから2nmに変更した以外は有機EL素子36と同様にして有機EL素子46を作製した。得られた有機EL素子46を有機EL素子1と同様にして封止し、有機EL素子46を得た。
有機EL素子46に対し、カソードを構成する材料を銀とインジウムから銀とマグネシウムに変更した以外は有機EL素子46と同様にして有機EL素子47を作製した。得られた有機EL素子47を有機EL素子1と同様にして封止し、有機EL素子47を得た。
有機EL素子45に対し、電子輸送層を構成する材料をAlq3から化合物94に変更した以外は有機EL素子45と同様にして有機EL素子48を作製した。得られた有機EL素子48を有機EL素子1と同様にして封止し、有機EL素子48を得た。
有機EL素子46に対し、電子輸送層を構成する材料をAlq3から化合物94に変更した以外は有機EL素子46と同様にして有機EL素子49を作製した。得られた有機EL素子49を有機EL素子1と同様にして封止し、有機EL素子49を得た。
有機EL素子47に対し、電子輸送層を構成する材料をAlq3から化合物94に変更した以外は有機EL素子47と同様にして有機EL素子50を作製した。得られた有機EL素子50を有機EL素子1と同様にして封止し、有機EL素子50を得た。
有機EL素子48に対し、電子輸送層を構成する材料を化合物94から化合物10に変更した以外は有機EL素子48と同様にして有機EL素子51を作製した。得られた有機EL素子51を有機EL素子1と同様にして封止し、有機EL素子51を得た。
有機EL素子49に対し、電子輸送層を構成する材料を化合物94から化合物10に変更した以外は有機EL素子49と同様にして有機EL素子52を作製した。得られた有機EL素子52を有機EL素子1と同様にして封止し、有機EL素子52を得た。
有機EL素子50に対し、電子輸送層を構成する材料を化合物94から化合物10に変更した以外は有機EL素子50と同様にして有機EL素子53を作製した。得られた有機EL素子53を有機EL素子1と同様にして封止し、有機EL素子53を得た。
(アノード~正孔阻止層の形成)
アノード~正孔阻止層までは有機EL素子1と同様な方法で形成した。
次に、化合物10の入った前記加熱ボートとフッ化カリウムの入った前記加熱ボートをそれぞれ独立に通電して、化合物10とフッ化カリウムの蒸着速度が75:25になるように調節し、膜厚20nmの電子輸送層を設けた。
次に、電子注入層まで成膜した素子を真空のまま第2真空槽に移し、第2真空槽を4×10-4Paまで減圧した後、銀の入った前記加熱ボートに通電して、膜厚8nmの銀からなる電極層を形成してカソードを得、有機EL素子54を作製した。得られた有機EL素子54を有機EL素子1と同様にして封止し、有機EL素子54を得た。
有機EL素子54に対し、カソードを構成する材料を銀から銀とインジウムに変更した以外は有機EL素子54と同様にして有機EL素子55を作製した。得られた有機EL素子55を有機EL素子1と同様にして封止し、有機EL素子55を得た。
有機EL素子54に対し、カソードを構成する材料を銀から銀とマグネシウムに変更した以外は有機EL素子54と同様にして有機EL素子56を作製した。得られた有機EL素子56を有機EL素子1と同様にして封止し、有機EL素子56を得た。
有機EL素子54に対し、発光ドーパントをIr-4からIr-26に変更した以外は有機EL素子54と同様にして有機EL素子57を作製した。得られた有機EL素子57を有機EL素子1と同様にして封止し、有機EL素子57を得た。
有機EL素子55に対し、発光ドーパントをIr-4からIr-26に変更した以外は有機EL素子55と同様にして有機EL素子58を作製した。得られた有機EL素子58を有機EL素子1と同様にして封止し、有機EL素子58を得た。
有機EL素子56に対し、発光ドーパントをIr-4からIr-26に変更した以外は有機EL素子56と同様にして有機EL素子59を作製した。得られた有機EL素子59を有機EL素子1と同様にして封止し、有機EL素子59を得た。
(アノード~カソードの形成)
アノード~カソードまでは有機EL素子57と同様な方法で形成した。
該カソード上に、シャドーマスクを用いて蒸着法で線幅50μm、厚み1μm、ピッチ1mmの間隔でライン状の銀パターンから成る補助電極を形成した。
次に、得られた素子を再び第1真空糟に移動し、化合物10の入った前記加熱ボートを通電して加熱し、蒸着速度0.1~0.2nm/秒で膜厚100nmの層を設け、有機EL素子60を作製した。得られた有機EL素子60を有機EL素子1と同様にして封止し、有機EL素子60を得た。
有機EL素子60に対し、カソードを構成する材料を銀から銀とインジウムに変更した以外は有機EL素子60と同様にして有機EL素子61を作製した。得られた有機EL素子61を有機EL素子1と同様にして封止し、有機EL素子61を得た。
有機EL素子60に対し、カソードを構成する材料を銀から銀とマグネシウムに変更した以外は有機EL素子60と同様にして有機EL素子62を作製した。得られた有機EL素子62を有機EL素子1と同様にして封止し、有機EL素子62を得た。
有機EL素子60に対し、隣接層を構成する材料を化合物10から比較化合物1に変更した以外は有機EL素子60と同様にして有機EL素子63を作製した。得られた有機EL素子63を有機EL素子1と同様にして封止し、有機EL素子63を得た。
上記で作製した各有機EL素子に対し、駆動電圧、効率、及び寿命の測定を行った。これらの評価は次のようにして行った。
上記で作製した各有機EL素子に対し、アノード側とカソード側の両側の正面輝度の和が1000cd/m2となるときの電圧を各有機EL素子の電圧とした。まず有機EL素子を作製した直後に電圧を測定した。次に、各有機EL素子を初期輝度4000cd/m2で駆動させ、輝度が半減するまでの時間を測定した。なお、輝度の測定には分光放射輝度計CS-1000(コニカミノルタセンシング社製)を用いた。得られた駆動電圧の数値が小さいほど、好ましい結果であることを表す。
SUS304から成る膜厚50μmの金属フォイルの全面にスパッタ法で膜厚1μmのSiO2の膜を成膜し、さらにスパッタ法で膜厚100nmのアルミネオジム合金を所望のパターンで成膜しアノードとした以外は、前述の両面エミッション型有機EL素子と同様な方法でトップエミッション型有機EL素子を作製し、本発明の効果を確認した。
2 支持基板
3 陽極(アノード)
4 正孔注入層
5 正孔輸送層
6 発光層
7 電子輸送層
8 カソード
8-1 補助電極
9 隣接層
20 照明装置
21 ガラス基板
22 ガラスケース
23 シール材
24 窒素ガス
25 吸湿化合物
Claims (16)
- 支持基板上に、カソード、発光層及び該カソードの外側(発光層と反対側)に隣接して隣接層を有し、該カソードは金属を含有する層から成り透明で、かつ膜厚が2nm以上、10nm未満であり、該隣接層は屈折率が1.6以上、1.95以下、膜厚が15nm以上、180nm以下で、かつ光散乱粒子を含有しないことを特徴とする有機エレクトロルミネッセンス素子。
- 前記隣接層が、キノリン誘導体を配位子とする金属錯体化合物を含有することを特徴とする請求項1に記載の有機エレクトロルミネッセンス素子。
- 前記隣接層が、下記一般式(1)で表される化合物を含有することを特徴とする請求項1または2に記載の有機エレクトロルミネッセンス素子。
一般式(1) (Ar1)n1-Y1
〔式中、n1は1以上の整数を表し、Y1はn1が1の場合は置換基を表し、n1が2以上の場合は単なる結合手またはn1価の連結基を表す。Ar1は下記一般式(A)で表される基を表し、n1が2以上の場合、複数のAr1は同一でも異なっていてもよい。但し、前記一般式(1)で表される化合物は分子内に3環以上の環が縮合してなる縮合芳香族複素環を少なくとも2つ有する。〕
〔式中、Xは、-N(R)-、-O-、-S-または-Si(R)(R′)-を表し、E1~E8は、-C(R1)=または-N=を表し、R、R′及びR1は水素原子、置換基またはY1との連結部位を表す。*はY1との連結部位を表す。Y2は単なる結合手または2価の連結基を表す。Y3及びY4は、各々5員または6員の芳香族環から導出される基を表し、少なくとも一方は環構成原子として窒素原子を含む芳香族複素環から導出される基を表す。n2は1~4の整数を表す。〕 - 前記一般式(1)で表される化合物が、下記一般式(2)で表される化合物であることを特徴とする請求項3に記載の有機エレクトロルミネッセンス素子。
〔式中、Y5は、アリーレン基、ヘテロアリーレン基またはそれらの組み合わせからなる2価の連結基を表す。E51~E66は、各々-C(R3)=または-N=を表し、R3は水素原子または置換基を表す。Y6~Y9は、各々芳香族炭化水素環から導出される基または芳香族複素環から導出される基を表し、Y6またはY7の少なくとも一方、及びY8またはY9の少なくとも一方は、N原子を含む芳香族複素環から導出される基を表す。
n3及びn4は0~4の整数を表すが、n3+n4は2以上の整数である。〕 - 前記カソードの主成分が銀であることを特徴とする請求項1~5のいずれか1項に記載の有機エレクトロルミネッセンス素子。
- 前記カソードと発光層との間に電子輸送層を有し、該電子輸送層がアルカリ金属またはアルカリ金属化合物を含有することを特徴とする請求項1~6のいずれか1項に記載の有機エレクトロルミネッセンス素子。
- 前記アルカリ金属またはアルカリ金属化合物が、カリウムまたはカリウム化合物であることを特徴とする請求項7に記載の有機エレクトロルミネッセンス素子。
- 前記電子輸送層が、前記一般式(1)~(3)で表される化合物を含有することを特徴とする請求項7または8に記載の有機エレクトロルミネッセンス素子。
- 前記発光層が、下記一般式(4)で表される化合物を含有することを特徴とする請求項1~9のいずれか1項に記載の有機エレクトロルミネッセンス素子。
〔式中、P、Qは、各々炭素原子または窒素原子を表し、A1はP-Cと共に芳香族炭化水素環または芳香族複素環を形成する原子群を表す。A2はQ-Nと共に芳香族複素環を形成する原子群を表す。P1-L1-P2は2座の配位子を表し、P1、P2は各々独立に炭素原子、窒素原子または酸素原子を表す。L1はP1、P2と共に2座の配位子を形成する原子群を表す。j1は1~3の整数を表し、j2は0~2の整数を表すが、j1+j2は2または3である。M1は元素周期表における8族~10族の遷移金属元素を表す。〕 - 前記一般式(4)で表される化合物が、下記一般式(5)で表される化合物であることを特徴とする請求項10に記載の有機エレクトロルミネッセンス素子。
〔式中、Zは、炭化水素環基または複素環基を表す。P、Qは、各々炭素原子または窒素原子を表し、A1はP-Cと共に芳香族炭化水素環または芳香族複素環を形成する原子群を表す。A3は-C(R01)=C(R02)-、-N=C(R02)-、-C(R01)=N-または-N=N-を表し、R01、R02は、各々水素原子または置換基を表す。P1-L1-P2は2座の配位子を表し、P1、P2は各々独立に炭素原子、窒素原子、または酸素原子を表す。L1はP1、P2と共に2座の配位子を形成する原子群を表す。j1は1~3の整数を表し、j2は0~2の整数を表すが、j1+j2は2または3である。M1は元素周期表における8族~10族の遷移金属元素を表す。〕 - 前記M1がイリジウムを表すことを特徴とする請求項10または11に記載の有機エレクトロルミネッセンス素子。
- 前記カソードと隣接層との間に補助電極を有することを特徴とする請求項1~12のいずれか1項に記載の有機エレクトロルミネッセンス素子。
- 両面エミッション型であることを特徴とする請求項1~13のいずれか1項に記載の有機エレクトロルミネッセンス素子。
- 請求項1~14のいずれか1項に記載の有機エレクトロルミネッセンス素子を備えることを特徴とする照明装置。
- 請求項1~14のいずれか1項に記載の有機エレクトロルミネッセンス素子を備えることを特徴とする表示装置。
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Cited By (2)
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US20140350642A1 (en) * | 2011-12-27 | 2014-11-27 | Merck Patent Gmbh | Metal Complexes Comprising 1,2,3-Triazoles |
JP2015122243A (ja) * | 2013-12-25 | 2015-07-02 | コニカミノルタ株式会社 | 透明電極及び電子デバイス |
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US9112168B2 (en) | 2015-08-18 |
EP2763507A1 (en) | 2014-08-06 |
JPWO2013035490A1 (ja) | 2015-03-23 |
US20140209886A1 (en) | 2014-07-31 |
EP2763507A4 (en) | 2015-09-16 |
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