WO2013038627A1 - 有機エレクトロルミネッセンス素子 - Google Patents
有機エレクトロルミネッセンス素子 Download PDFInfo
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- WO2013038627A1 WO2013038627A1 PCT/JP2012/005665 JP2012005665W WO2013038627A1 WO 2013038627 A1 WO2013038627 A1 WO 2013038627A1 JP 2012005665 W JP2012005665 W JP 2012005665W WO 2013038627 A1 WO2013038627 A1 WO 2013038627A1
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- 0 CC(C)(C(C)(*)C1(C)*)C(*)(*)C(*)(*)C1=* Chemical compound CC(C)(C(C)(*)C1(C)*)C(*)(*)C(*)(*)C1=* 0.000 description 3
- PGAQLIOPWKGXKO-UHFFFAOYSA-N Cc(cc1)ccc1N(c(cc1)ccc1-c(cc1)ccc1-c(cc1)ccc1N(c1ccc(C)cc1)c1ccc2[s]c(cccc3)c3c2c1)c1ccc2[s]c3ccccc3c2c1 Chemical compound Cc(cc1)ccc1N(c(cc1)ccc1-c(cc1)ccc1-c(cc1)ccc1N(c1ccc(C)cc1)c1ccc2[s]c(cccc3)c3c2c1)c1ccc2[s]c3ccccc3c2c1 PGAQLIOPWKGXKO-UHFFFAOYSA-N 0.000 description 1
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Definitions
- the present invention relates to an organic electroluminescence element (hereinafter, abbreviated as an organic EL element) which is a self-luminous element suitable for various display devices, and more particularly to an organic EL element using a specific arylamine derivative.
- the present invention relates to an organic EL element in which the light extraction efficiency is greatly improved.
- the organic EL element is a self-luminous element, it has been actively researched because it is brighter and more visible than a liquid crystal element and has a clear display.
- a light emitting element having a top emission structure in which a metal having a high work function is used for an anode and light is emitted from the upper part has been used.
- a light emitting element having a bottom emission structure in which the area of the light emitting part is limited by the pixel circuit, a light emitting element having a top emission structure has an advantage that a wide light emitting part can be obtained.
- a semitransparent electrode such as LiF / Al / Ag (for example, see Non-Patent Document 2), Ca / Mg (for example, see Non-Patent Document 3), LiF / MgAg, or the like is used as a cathode.
- the effect of the capping layer in the light emitting device having the top emission structure is that a light emitting device using Ir (ppy) 3 as a light emitting material has a current efficiency of 38 cd / A when there is no capping layer.
- a light emitting device using Ir (ppy) 3 has a current efficiency of 38 cd / A when there is no capping layer.
- an efficiency improvement of about 1.7 times as 64 cd / A was recognized.
- the maximum point of transmittance and the maximum point of efficiency of the translucent electrode and the capping layer do not necessarily coincide with each other, and the maximum point of light extraction efficiency is determined by the interference effect. (For example, refer nonpatent literature 3).
- a metal mask with high definition for the formation of the capping layer, but such a metal mask has a problem that the alignment accuracy is deteriorated due to thermal distortion. That is, ZnSe has a high melting point of 1100 ° C. or higher (see, for example, Non-Patent Document 3), and cannot be deposited at an accurate position with a high-definition mask. Many inorganic substances have high deposition temperatures and are not suitable for use with high-definition masks, and may damage the light-emitting elements themselves. Further, in the film formation by the sputtering method, the light emitting element is damaged, and therefore a capping layer containing an inorganic material cannot be used.
- Alq 3 is a green light-emitting material or electron transport.
- organic EL material generally used as a material, it has weak absorption in the vicinity of 450 nm used for a blue light emitting element. Therefore, in the case of a blue light emitting element, there is a problem that both the color purity is lowered and the light extraction efficiency is lowered.
- JP-A-8-048656 Japanese Patent No. 3194657 JP-A-7-126615 JP-A-8-048656 JP 2005-108804 A
- the object of the present invention is to improve the device characteristics of the organic EL device, in particular, to greatly improve the light extraction efficiency, and has a high refractive index and excellent thin film stability and durability.
- An object of the present invention is to provide an organic EL device having a capping layer made of a material that does not absorb in the wavelength regions of blue, green, and red.
- the physical properties of the capping layer material suitable for the present invention include (1) high refractive index, (2) vapor deposition and no thermal decomposition, (3) stable thin film state, 4) The glass transition temperature is high.
- the physical characteristics of the element suitable for the present invention include (1) high light extraction efficiency, (2) no decrease in color purity, and (3) light transmission without change over time. (4) Long life can be mentioned.
- the present inventors selected a specific arylamine compound having a high refractive index and capped the arylamine material, focusing on the excellent stability and durability of the thin film.
- the present invention was completed.
- the following organic EL elements are provided.
- the capping layer has two triphenylamine structures in the molecule, a single bond or
- the organic EL element containing the arylamine compound (X) which has a structure connected with the bivalent group which does not contain a hetero atom.
- An arylamine compound (X) having a structure in which two triphenylamine structures in the molecule are connected by a single bond or a divalent group not containing a hetero atom is an aryl represented by the following general formula (1):
- R 1 to R 28 may be the same or different, and may be a hydrogen atom, deuterium atom, fluorine atom, chlorine atom, cyano group, trifluoromethyl group, nitro group, or optionally substituted carbon.
- R 1 ⁇ R 10, R 19 ⁇ R 28 are each A may represent a divalent group represented by the following structural formulas (B) to (F) or a single bond, provided that A may be bonded to the benzene ring to which the group is bonded.
- any one or more of R 1 to R 28 are substituted or unsubstituted aromatic hydrocarbon groups.
- R 29 to R 32 may be the same or different from each other, and may be a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a linear or branched chain having 1 to 6 carbon atoms
- R 33 to R 42 may be the same or different from each other, hydrogen atom, deuterium atom, fluorine atom, chlorine atom, cyano group, trifluoromethyl group, linear or branched chain having 1 to 6 carbon atoms
- R 43 to R 50 may be the same or different from each other, and may be a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a linear or branched chain having 1 to 6 carbon atoms
- R 51 to R 55 may be the same or different, and are a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a linear or branched chain having 1 to 6 carbon atoms.
- R 1 to R 10 and R 19 to R 28 are bonded to the benzene ring to which each group is bonded through a single bond, a substituted or unsubstituted methylene group, an oxygen atom, a sulfur atom, or N—Ar.
- a ring may be formed.
- N in “N—Ar” represents a nitrogen atom
- “Ar” represents “substituted or unsubstituted aromatic hydrocarbon group”, “substituted or unsubstituted aromatic heterocyclic group” or “substituted” Or an unsubstituted condensed polycyclic aromatic group ”, the same groups as those shown for the same groups in R 1 to R 28 below, and the substituents that these groups may have are also shown below. Examples of the substituent are the same as those shown for the same kind of group in R 1 to R 28 .
- a linear or branched alkyl group having 1 to 6 carbon atoms having a substituent represented by R 1 to R 28 in the general formula (1), and “5 to 5 carbon atoms having a substituent”
- Specific examples of the “substituent” in “10 cycloalkyl group” or “straight-chain or branched alkenyl group having 2 to 6 carbon atoms having a substituent” include a deuterium atom, a trifluoromethyl group, Cyano group, nitro group; halogen atom such as fluorine atom, chlorine atom, bromine atom, iodine atom; methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, tert-butyl group, n
- a linear or branched alkyl group having 1 to 6 carbon atoms such as a pentyl group, isopentyl group, neopen
- Vinyl group acyl group such as acetyl group and benzoyl group; dialkylamino group such as dimethylamino group and diethylamino group; substituted with aromatic hydrocarbon group such as diphenylamino group and dinaphthylamino group or condensed polycyclic aromatic group Disubstituted amino groups; Diaralkylamino groups such as dibenzylamino groups and diphenethylamino groups; Disubstituted amino groups substituted with aromatic heterocyclic groups such as dipyridylamino groups and dithienylamino groups; Diallylamino groups and the like Dialkenylamino group; alkyl group, aromatic And a group such as a disubstituted amino group substituted with a substituent selected from an aromatic hydrocarbon group, a condensed polycyclic aromatic group, an aralkyl group, an aromatic heterocyclic group, or an alkenyl group.
- the group may be further substituted with other substituent
- the group include methyloxy group, ethyloxy group, n-propyloxy group, isopropyloxy group, n-butyloxy group, tert-butyloxy group, n-pentyloxy group, n-hexyloxy group, cyclopentyloxy group Group, cyclohexyloxy group, cycloheptyloxy group, cyclooctyloxy group, 1-adamantyloxy group and 2-adamantyl group Etc.
- alkoxy groups these substituents may be bonded to each other to form a ring.
- R 1 to R 10 and R 19 to R 28 are bonded to the benzene ring to which each group is bonded through a single bond, a substituted or unsubstituted methylene group, an oxygen atom, a sulfur atom, or N—Ar.
- a ring may be formed.
- N in “N—Ar” represents a nitrogen atom
- “Ar” represents “substituted or unsubstituted aromatic hydrocarbon group”, “substituted or unsubstituted aromatic heterocyclic group” or “substituted” Or an unsubstituted condensed polycyclic aromatic group ”, the same groups as those shown for the same groups in R 1 to R 28 below, and the substituents that these groups may have are also shown below. Examples of the substituent are the same as those shown for the same kind of group in R 1 to R 28 .
- a linear or branched alkyloxy group having 1 to 6 carbon atoms having a substituent represented by R 1 to R 28 in the general formula (1) or "5 carbon atoms having a substituent”
- Specific examples of the “substituent” in “10 to 10 cycloalkyloxy groups” include deuterium atom, trifluoromethyl group, cyano group, nitro group; halogen atom such as fluorine atom, chlorine atom, bromine atom and iodine atom.
- 1 to 1 carbon atoms such as methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, tert-butyl group, n-pentyl group, isopentyl group, neopentyl group, n-hexyl group; 6 straight-chain or branched alkyl groups; straight-chain or branched alkyl groups having 1 to 6 carbon atoms such as methyloxy group, ethyloxy group, propyloxy group Alkyl groups such as allyl groups; Aralkyl groups such as benzyl groups, naphthylmethyl groups and phenethyl groups; Aryloxy groups such as phenyloxy groups and tolyloxy groups; Arylalkyloxy groups such as benzyloxy groups and phenethyloxy groups; Aromatic hydrocarbon groups or condensed polycyclic aromatic groups such as phenyl group, biphen
- R 1 to R 10 and R 19 to R 28 are bonded to the benzene ring to which each group is bonded through a single bond, a substituted or unsubstituted methylene group, an oxygen atom, a sulfur atom, or N—Ar.
- a ring may be formed.
- N in “N—Ar” represents a nitrogen atom
- “Ar” represents “substituted or unsubstituted aromatic hydrocarbon group”, “substituted or unsubstituted aromatic heterocyclic group” or “substituted” Or an unsubstituted condensed polycyclic aromatic group ", and examples thereof include the same groups as those described above, and the substituents that these groups may have are the same as those shown for the same substituents as described below. Of the substituents.
- substituted aromatic hydrocarbon group “substituted aromatic heterocyclic group” or “substituted condensed polycyclic aromatic group” represented by R 1 to R 28 in the general formula (1) Specifically, deuterium atom, cyano group, trifluoromethyl group, nitro group; halogen atom such as fluorine atom, chlorine atom, bromine atom, iodine atom; methyl group, ethyl group, n-propyl group, isopropyl group A linear or branched alkyl group having 1 to 6 carbon atoms such as n-butyl group, isobutyl group, tert-butyl group, n-pentyl group, isopentyl group, neopentyl group, n-hexyl group, etc .; cyclopentyl group A cycloalkyl group having 5 to 10 carbon atoms such as cyclohexy
- a branched alkenyl group a linear or branched alkyloxy group having 1 to 6 carbon atoms such as a methyloxy group, an ethyloxy group or a propyloxy group; a carbon atom number such as a cyclopentyloxy group or a cyclohexyloxy group 5 to 10 cycloalkyloxy groups; aralkyl groups such as benzyl group, naphthylmethyl group, phenethyl group; phenyloxy group, tolyloxy group, biphenylyloxy group, terphenylyloxy group, naphthyloxy group, anthryloxy group, Aryloxy groups such as phenanthryloxy group, fluorenyloxy group, indenyloxy group, pyrenyloxy group and perylenyloxy group; arylalkyloxy groups such as benzyloxy group and phenethyloxy group; phenyl group, biphenylyl
- aryloxy group in the “substituted or unsubstituted aryloxy group” represented by R 1 to R 28 in the general formula (1) include a phenyloxy group, a tolyloxy group, and biphenylyloxy.
- R 1 to R 10 and R 19 to R 28 are bonded to the benzene ring to which each group is bonded through a single bond, a substituted or unsubstituted methylene group, an oxygen atom, a sulfur atom, or N—Ar.
- a ring may be formed.
- N in “N—Ar” represents a nitrogen atom
- Ar represents “substituted or unsubstituted aromatic hydrocarbon group”, “substituted or unsubstituted aromatic heterocyclic group” or “substituted” Or an unsubstituted condensed polycyclic aromatic group ”, and the same groups as those described above for the same type of groups in R 1 to R 28 are mentioned.
- the substituents that these groups may have are also Examples of the substituent are the same as those shown for the same kind of group in R 1 to R 28 .
- substituted aryloxy group represented by R 1 to R 28 in the general formula (1)
- substituents such as fluorine atom, chlorine atom, bromine atom, iodine atom; methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, tert-butyl group, n-pentyl group, isopentyl group A linear or branched alkyl group having 1 to 6 carbon atoms such as neopentyl group and n-hexyl group; a cycloalkyl group having 5 to 10 carbon atoms such as cyclopentyl group and cyclohexyl group; vinyl group and allyl group A straight or branched alkenyl
- Aromatic heterocyclic groups aryl vinyl groups such as styryl groups and naphthyl vinyl groups; acyl groups such as acetyl groups and benzoyl groups; dialkylamino groups such as dimethylamino groups and diethylamino groups; aromatics such as diphenylamino groups and dinaphthylamino groups Group hydrocarbons Di-substituted amino group substituted with an elementary group or condensed polycyclic aromatic group; diaralkylamino group such as dibenzylamino group and diphenethylamino group; aromatic heterocyclic group such as dipyridylamino group and dithienylamino group Substituted disubstituted amino groups; dialkenylamino groups such as diallylamino groups; substitutions selected from alkyl groups, aromatic hydrocarbon groups, condensed polycyclic aromatic groups, aralkyl groups, aromatic heterocyclic groups or alkenyl groups Examples thereof include a group such as a
- substituents may be bonded to each other via a single bond, a substituted or unsubstituted methylene group, an oxygen atom or a sulfur atom to form a ring.
- substituents are bonded to each other through a single bond or a dimethylmethylene group to form a ring.
- a substituted or unsubstituted aromatic hydrocarbon group represented by R 29 to R 55 in the structural formulas (B) to (D) and (F) corresponding to A in the general formula (1); “Aromatic hydrocarbon group”, “aromatic heterocyclic group” or “fused polycyclic aromatic group” in “substituted or unsubstituted aromatic heterocyclic group” or “substituted or unsubstituted condensed polycyclic aromatic group” Specifically, phenyl group, biphenylyl group, terphenylyl group, tetrakisphenyl group, styryl group, naphthyl group, anthryl group, acenaphthenyl group, fluorenyl group, phenanthryl group, indenyl group, pyrenyl group, pyridyl group, pyrimidyl group, Furanyl, pyrrolyl, thienyl, quinolyl, isoquinolyl,
- substituents when a plurality of these substituents are bonded to the same benzene ring, these substituents are bonded to each other via a single bond, a substituted or unsubstituted methylene group, an oxygen atom or a sulfur atom.
- a ring may be formed.
- substituents When a ring is formed here, it is preferable that substituents are bonded to each other through a single bond or a dimethylmethylene group to form a ring.
- Substituted aromatic hydrocarbon group and “substituted aromatic complex” represented by R 29 to R 55 in the structural formulas (B) to (D) and (F) corresponding to A in the general formula (1)
- Specific examples of the “substituent” in the “ring group” or “substituted condensed polycyclic aromatic group” include a deuterium atom, a fluorine atom, a chlorine atom, a trifluoromethyl group, and a straight chain having 1 to 6 carbon atoms.
- substituents may be bonded to each other via a single bond, a substituted or unsubstituted methylene group, an oxygen atom or a sulfur atom to form a ring.
- substituents are bonded to each other through a single bond or a dimethylmethylene group to form a ring.
- the arylamine compound (X) used in the organic EL device of the present invention having a structure in which two triphenylamine structures in the molecule are connected by a single bond or a divalent group not containing a hetero atom is an organic EL device. It can be used as a constituent material of a hole injection layer, a hole transport layer, a light emitting layer, an electron blocking layer or a capping layer.
- the thickness of the capping layer is preferably in the range of 30 nm to 120 nm, and more preferably in the range of 40 nm to 80 nm.
- the refractive index of the capping layer is preferably 1.75 or more, and the wavelength of light transmitted through the capping layer is in the range of 530 nm to 750 nm, preferably 1.80 or more. More preferably.
- the capping layer may be produced by laminating two or more different constituent materials.
- the organic EL element of the present invention has a capping layer having a refractive index higher than that of the semi-transparent electrode provided outside the transparent or semi-transparent electrode, an organic EL element capable of greatly improving the light extraction efficiency is provided. can get.
- a specific arylamine compound having a structure in which two triphenylamine structures in the molecule are connected by a single bond or a divalent group not containing a heteroatom in the capping layer a temperature of 400 ° C. or lower is used. Therefore, it is possible to optimize the light extraction efficiency of each color by using a high-definition mask without damaging the light emitting element, and it can be suitably applied to a full-color display, and the color purity. Can display a clear and bright image.
- the organic EL element of the present invention uses a material for an organic EL element having a high refractive index and excellent thin film stability and durability as a material for the capping layer, compared with a conventional organic EL element, The light extraction efficiency can be greatly improved. Furthermore, it has become possible to realize an organic EL element with high efficiency and long life.
- FIG. 3 is a diagram showing organic EL element configurations of Examples 3 to 10 and Comparative Example 1.
- a structure represented by the above general formula (1) which is preferably used in the organic EL device of the present invention, is a structure in which two triphenylamine structures are linked by a divalent group containing no single bond or heteroatom in the molecule.
- the arylamine compound possessed can be synthesized by known methods (see, for example, Patent Documents 3 to 5).
- a structure represented by the above general formula (1) which is preferably used in the organic EL device of the present invention, is a structure in which two triphenylamine structures are linked by a divalent group containing no single bond or heteroatom in the molecule.
- Specific examples of particularly preferred compounds among the arylamine compounds (X ′) possessed are shown below, but are not limited to these compounds.
- the arylamine compound (X) having a structure in which two triphenylamine structures are connected by a divalent group not containing a single bond or a hetero atom in the molecule
- the arylamine compound (X ′) having a structure in which two triphenylamine structures in the molecule represented by the formula (1) are connected by a single bond or a divalent group not containing a hetero atom Specific examples are shown below, but are not limited to these compounds.
- melting point is an index of vapor deposition
- glass transition point (Tg) is an index of stability in a thin film state
- refractive index is an index for improving the light extraction efficiency
- Tg Melting point and glass transition point (Tg) were measured with a high sensitivity differential scanning calorimeter (Bruker AXS, DSC3100S) using powder.
- the refractive index was measured using a small high-speed spectroscopic ellipsometer device (manufactured by ULVAC, UNECS-2000) after preparing a 60 nm thin film on a silicon substrate.
- the structure of the organic EL device of the present invention is a light emitting device having a top emission structure, and is sequentially formed on a glass substrate with a metal anode, a hole transport layer, a light emitting layer, an electron transport layer, a translucent cathode, and a capping.
- a metal anode a hole transport layer between the anode and the hole transport layer, one having an electron blocking layer between the hole transport layer and the light emitting layer, and between the light emitting layer and the electron transport layer
- Examples thereof include those having a hole blocking layer and those having an electron injection layer between the electron transport layer and the cathode.
- each layer of the organic EL element is preferably about 200 nm to 750 nm, and more preferably about 350 nm to 600 nm.
- the film thickness of the capping layer is preferably 30 nm to 120 nm, for example, and more preferably 40 nm to 80 nm. In this case, good light extraction efficiency can be obtained. Note that the thickness of the capping layer can be changed as appropriate depending on the type of the light emitting material used for the light emitting element, the thickness of the organic EL element other than the capping layer, and the like.
- an electrode material having a large work function such as ITO or gold is used.
- an arylamine compound having a structure in which three or more triphenylamine structures are connected by a divalent group not containing a single bond or a hetero atom in the molecule for example, starburst Materials such as triphenylamine derivatives of various types, various triphenylamine tetramers, porphyrin compounds represented by copper phthalocyanine, acceptor heterocyclic compounds such as hexacyanoazatriphenylene, and coating-type polymer materials Can be used. These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used. These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- N, N′-diphenyl-N, N′-di (m-tolyl) benzidine hereinafter abbreviated as TPD
- NPD N, N′-diphenyl- N, N′-di ( ⁇ -naphthyl) benzidine
- TAPC 1,1-bis [4- (di-4-tolylamino) phenyl] cyclohexane
- arylamine compounds having a structure in which three or more triphenylamine structures in the molecule are connected by a divalent group not containing a single bond or a hetero atom such as various triphenylamine trimers and tetramers, Etc. are preferably used. These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used. These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- a material that is usually used for the layer is further P-doped with trisbromophenylamine hexachloroantimony or the like, or a TPD structure having a partial structure. Molecular compounds and the like can be used.
- TCTA 4,4 ′, 4 ′′ -tri (N-carbazolyl) triphenylamine
- TCTA 9,9-bis [4- (carbazole- 9-yl) phenyl] fluorene
- mCP 1,3-bis (carbazol-9-yl) benzene
- Ad 2,2-bis (4-carbazol-9-ylphenyl) adamantane
- Carbazole derivatives such as 9- [4- (carbazol-9-yl) phenyl] -9- [4- (triphenylsilyl) phenyl] -9H-fluorene
- a compound having an electron blocking action such as a compound having a triarylamine structure can be used.
- These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used.
- These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- the light emitting layer of the organic EL device of the present invention metal complexes of quinolinol derivatives such as Alq 3 , various metal complexes, anthracene derivatives, bisstyrylbenzene derivatives, pyrene derivatives, oxazole derivatives, polyparaphenylene vinylene derivatives, and the like are used. be able to.
- the light-emitting layer may be composed of a host material and a dopant material.
- a thiazole derivative, a benzimidazole derivative, a polydialkylfluorene derivative, or the like can be used in addition to the light-emitting material.
- quinacridone coumarin, rubrene, perylene, and derivatives thereof
- benzopyran derivatives rhodamine derivatives, aminostyryl derivatives, and the like
- These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used.
- a phosphorescent material can be used as the light emitting material.
- a phosphorescent emitter of a metal complex such as iridium or platinum can be used.
- Green phosphorescent emitters such as Ir (ppy) 3
- blue phosphorescent emitters such as FIrpic and FIr6, red phosphorescent emitters such as Btp 2 Ir (acac), and the like are used as host materials.
- the hole injecting / transporting host material 4,4′-di (N-carbazolyl) biphenyl (hereinafter abbreviated as CBP), carbazole derivatives such as TCTA, mCP, and the like can be used.
- CBP 4,4′-di (N-carbazolyl) biphenyl
- carbazole derivatives such as TCTA, mCP, and the like can be used.
- p-bis (triphenylsilyl) benzene (hereinafter abbreviated as UGH2) or 2,2 ′, 2 ′′-(1,3,5-phenylene) -tris (1-phenyl) -1H-benzimidazole) (hereinafter abbreviated as TPBI)
- UGH2 p-bis (triphenylsilyl) benzene
- TPBI 2,2 ′, 2 ′′-(1,3,5-phenylene) -tris (1-phenyl) -1H-benzimidazole
- the phosphorescent light-emitting material into the host material by co-evaporation in the range of 1 to 30 weight percent with respect to the entire light-emitting layer.
- These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- phenanthroline derivatives such as bathocuproine (hereinafter abbreviated as BCP), aluminum (III) bis (2-methyl-8-quinolinato) -4-phenylphenolate (hereinafter referred to as “BCP”).
- BCP bathocuproine
- BCP aluminum (III) bis (2-methyl-8-quinolinato) -4-phenylphenolate
- BAlq quinolinol derivative metal complex
- various rare earth complexes such as BAlq
- triazole derivatives triazine derivatives
- oxadiazole derivatives and the like.
- These materials may also serve as the material for the electron transport layer.
- These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used.
- These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor de
- metal complexes of quinolinol derivatives such as Alq 3 and BAlq, various metal complexes, triazole derivatives, triazine derivatives, oxadiazole derivatives, thiadiazole derivatives, pyridoindole derivatives, carbodiimides Derivatives, quinoxaline derivatives, phenanthroline derivatives, silole derivatives, and the like can be used.
- quinolinol derivatives such as Alq 3 and BAlq
- various metal complexes such as Alq 3 and BAlq
- triazole derivatives triazine derivatives
- oxadiazole derivatives oxadiazole derivatives
- thiadiazole derivatives pyridoindole derivatives
- carbodiimides Derivatives quinoxaline derivatives, phenanthroline derivatives, silole derivatives, and the like
- These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone,
- an alkali metal salt such as lithium fluoride and cesium fluoride
- an alkaline earth metal salt such as magnesium fluoride
- a metal oxide such as aluminum oxide
- a material usually used for the layer and further doped with a metal such as cesium can be used.
- an electrode material having a low work function such as aluminum, an alloy having a lower work function such as a magnesium silver alloy, a magnesium calcium alloy, a magnesium indium alloy, an aluminum magnesium alloy, ITO, IZO or the like is used as an electrode material.
- an aryl having a structure in which two triphenylamine structures in the molecule represented by the general formula (1) are connected by a single bond or a divalent group not containing a hetero atom It is preferable to use an amine compound such as N, N, N ′, N′-tetrabiphenylylbenzidine. These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used. These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- the organic EL element having the top emission structure has been described.
- the present invention is not limited to this, and the organic EL element having the bottom emission structure and the dual emission structure that emits light from both the top and bottom directions. The same can be applied to the organic EL element.
- an electrode in a direction in which light is extracted from the light emitting element to the outside needs to be transparent or translucent.
- the refractive index of the material constituting the capping layer is preferably larger than the refractive index of the adjacent electrode.
- the refractive index of the material constituting the capping layer is preferably larger than the refractive index of the adjacent electrode, and the refractive index may be 1.70 or more, more preferably 1.75 or more, and 1.80. The above is particularly preferable.
- Exemplary Compound (1-33) 210 ° C 113 ° C
- Exemplary Compound (1-36) 160 ° C. 125 ° C.
- Exemplary Compound (1-37) 168 ° C 144 ° C
- Exemplary Compound (1-46) 251 ° C 128 ° C
- the compound of the present invention has a glass transition point of 100 ° C. or higher. This indicates that the thin film state is stable in the compound of the present invention.
- a deposited film having a film thickness of 60 nm was prepared on a silicon substrate, and a refractive index of 633 nm was measured using a small high-speed spectroscopic ellipsometer (manufactured by ULVAC, model UNECS-2000).
- the compound of the present invention has a value higher than the refractive index of 1.70 of the comparative compound (Alq 3 ), and an improvement in light extraction efficiency in a large organic EL device can be expected.
- the organic EL element has a hole injection layer 3, a hole transport layer 4, a light emitting layer 5, an electron transport on a glass substrate 1 on which a reflective ITO electrode is previously formed as a metal anode 2.
- the layer 6, the electron injection layer 7, the cathode 8, and the capping layer 9 were deposited in this order.
- the glass substrate 1 formed with ITO having a thickness of 150 nm was subjected to ultrasonic cleaning in isopropyl alcohol for 20 minutes, and then dried on a hot plate heated to 250 ° C. for 10 minutes. Then, after performing UV ozone treatment for 2 minutes, this glass substrate with ITO was attached in a vacuum evaporation machine, and pressure was reduced to 0.001 Pa or less. Subsequently, a compound 2 having the following structural formula was formed as a hole injection layer 3 so as to cover the metal anode 2 so as to have a film thickness of 60 nm at a deposition rate of 6 nm / min.
- the compound (1-13) having the above structural formula was formed as the hole transport layer 4 so as to have a film thickness of 40 nm at a deposition rate of 6 nm / min.
- the compound 5 of the following structural formula was formed as the electron transport layer 6 so as to have a film thickness of 30 nm at a deposition rate of 6 nm / min.
- lithium fluoride was formed as the electron injection layer 7 so as to have a film thickness of 0.5 nm at a deposition rate of 0.6 nm / min.
- a magnesium silver alloy was formed as a cathode 8 so as to have a film thickness of 10 nm.
- the exemplified compound (1-13) was formed as the capping layer 9 so as to have a film thickness of 60 nm at a deposition rate of 6 nm / min.
- the characteristic measurement was performed at normal temperature in air
- Example 3 an organic EL device was produced under the same conditions except that the exemplified compound (1-17) was formed to a thickness of 60 nm instead of the exemplified compound (1-13) as the capping layer 9.
- the characteristic measurement was performed at normal temperature in air
- Table 1 summarizes the measurement results of the light emission characteristics when a DC voltage was applied to the manufactured organic EL element.
- Example 3 an organic EL device was produced under the same conditions except that the exemplified compound (1-18) was formed to a thickness of 60 nm instead of the exemplified compound (1-13) as the capping layer 9.
- the characteristic measurement was performed at normal temperature in air
- Table 1 summarizes the measurement results of the light emission characteristics when a DC voltage was applied to the manufactured organic EL element.
- Example 3 an organic EL device was produced under the same conditions except that the exemplified compound (1-27) was formed to a film thickness of 60 nm instead of the exemplified compound (1-13) as the capping layer 9.
- the characteristic measurement was performed at normal temperature in air
- Example 3 an organic EL device was produced under the same conditions except that the exemplified compound (1-32) was formed to a film thickness of 60 nm instead of the exemplified compound (1-13) as the capping layer 9.
- the characteristic measurement was performed at normal temperature in air
- Table 1 summarizes the measurement results of the light emission characteristics when a DC voltage was applied to the manufactured organic EL element.
- Example 3 an organic EL device was produced under the same conditions except that the exemplified compound (1-33) was formed to a film thickness of 60 nm instead of the exemplified compound (1-13) as the capping layer 9.
- the characteristic measurement was performed at normal temperature in air
- Table 1 summarizes the measurement results of the light emission characteristics when a DC voltage was applied to the manufactured organic EL element.
- Example 3 an organic EL device was produced under the same conditions except that the exemplified compound (1-36) was formed to a film thickness of 60 nm instead of the exemplified compound (1-13) as the capping layer 9.
- the characteristic measurement was performed at normal temperature in air
- Table 1 summarizes the measurement results of the light emission characteristics when a DC voltage was applied to the manufactured organic EL element.
- Example 3 an organic EL device was produced under the same conditions except that the exemplified compound (1-37) was formed to a film thickness of 60 nm instead of the exemplified compound (1-13) as the capping layer 9.
- the characteristic measurement was performed at normal temperature in air
- Table 1 summarizes the measurement results of the light emission characteristics when a DC voltage was applied to the manufactured organic EL element.
- Example 1 An organic EL device was produced under the same conditions as in Example 3, except that Alq 3 was formed to a thickness of 60 nm instead of the exemplified compound (1-13) as the capping layer 9. About the produced organic EL element, the characteristic measurement was performed at normal temperature in air
- the driving voltage at a current density of 10 mA / cm 2 was almost the same in Examples 3 to 10 as compared to Comparative Example 1 using Alq 3 , but the luminance, luminous efficiency, power Both of the efficiency improved. Furthermore, a significant improvement in external quantum efficiency was confirmed. This indicates that the light extraction efficiency can be significantly improved by including a material having a high refractive index suitable for the organic EL device of the present invention in the capping layer.
- an arylamine compound having a structure in which two triphenylamine structures in a molecule are connected by a divalent group not containing a single bond or a hetero atom which is preferably used in the organic EL device of the present invention. Since the refractive index is high, the light extraction efficiency can be greatly improved, and the thin film state is stable, it is excellent as a compound for an organic EL device. By producing an organic EL device using the compound, high efficiency can be obtained and durability can be improved.
- the use of the compound having no absorption in each of the blue, green, and red wavelength regions is particularly suitable for displaying a clear and bright image with good color purity. For example, it has become possible to develop home appliances and lighting.
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Abstract
Description
融点 ガラス転移点
例示化合物(1-1) 265℃ 132℃
例示化合物(1-13) 216℃ 103℃
例示化合物(1-14) 218℃ 160℃
例示化合物(1-17) 273℃ 108℃
例示化合物(1-18) 266℃ 106℃
例示化合物(1-27) 258℃ 126℃
例示化合物(1-32) 153℃ 107℃
例示化合物(1-33) 210℃ 113℃
例示化合物(1-36) 160℃ 125℃
例示化合物(1-37) 168℃ 144℃
例示化合物(1-46) 251℃ 128℃
屈折率
例示化合物(1-1) 1.81
例示化合物(1-13) 1.78
例示化合物(1-14) 1.76
例示化合物(1-17) 1.79
例示化合物(1-18) 1.88
例示化合物(1-27) 1.82
例示化合物(1-32) 1.80
例示化合物(1-33) 1.89
例示化合物(1-36) 1.76
例示化合物(1-37) 1.85
例示化合物(1-42) 1.76
例示化合物(1-46) 1.78
比較化合物(Alq3) 1.70
作製した有機EL素子に直流電圧を印加した発光特性の測定結果を表1にまとめて示した。
実施例3において、キャッピング層9として例示化合物(1-13)に代えてAlq3を膜厚60nmとなるように形成した以外は、同様の条件で有機EL素子を作製した。作製した有機EL素子について、大気中、常温で特性測定を行なった。作製した有機EL素子に直流電圧を印加した発光特性の測定結果を表1にまとめて示した。
2 金属陽極
3 正孔注入層
4 正孔輸送層
5 発光層
6 電子輸送層
7 電子注入層
8 陰極
9 キャッピング層
Claims (8)
- 少なくとも陽極電極、正孔輸送層、発光層、電子輸送層、陰極電極およびキャッピング層をこの順に有する有機エレクトロルミネッセンス素子において、前記キャッピング層が分子中にトリフェニルアミン構造を2個、単結合またはヘテロ原子を含まない2価基で連結した構造を有するアリールアミン化合物(X)を含む、有機エレクトロルミネッセンス素子。
- 前記分子中にトリフェニルアミン構造を2個、単結合またはヘテロ原子を含まない2価基で連結した構造を有するアリールアミン化合物(X)が、下記一般式(1)で表されるアリールアミン化合物(X’)である、請求項1に記載の有機エレクトロルミネッセンス素子。
(式中、R1~R28は同一でも異なってもよく水素原子、重水素原子、フッ素原子、塩素原子、シアノ基、トリフルオロメチル基、ニトロ基、置換基を有していてもよい炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換基を有していてもよい炭素原子数2ないし6の直鎖状もしくは分岐状のアルケニル基、置換基を有していてもよい炭素原子数5ないし10のシクロアルキル基、置換基を有していてもよい炭素原子数1ないし6の直鎖状もしくは分岐状のアルキルオキシ基、置換基を有していてもよい炭素原子数5ないし10のシクロアルキルオキシ基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、置換もしくは無置換の縮合多環芳香族基または置換もしくは無置換のアリールオキシ基であって、これらの置換基が同一のベンゼン環に複数個結合している場合は互いに結合して環を形成していてもよく、R1~R10、R19~R28は、それぞれの基が結合しているベンゼン環と結合して環を形成してもよい。Aは下記構造式(B)~(F)で示される2価基、または単結合を表す。但し、Aが単結合である場合、R1~R28のいずれか1以上が置換もしくは無置換の芳香族炭化水素基であるものとする。)
(式中、R29~R32は同一でも異なってもよく水素原子、重水素原子、フッ素原子、塩素原子、シアノ基、トリフルオロメチル基、炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、炭素原子数2ないし6の直鎖状もしくは分岐状のアルケニル基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基であって、これらの置換基が同一のベンゼン環に複数個結合している場合は互いに結合して環を形成していてもよい。nは1~3の整数を表す。ここで、R29~R32がそれぞれ複数個存在している場合(nが2または3の場合)は、互いに同一でも異なってもよいものとする。)
(式中、R33~R42は同一でも異なってもよく水素原子、重水素原子、フッ素原子、塩素原子、シアノ基、トリフルオロメチル基、炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、炭素原子数2ないし6の直鎖状もしくは分岐状のアルケニル基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基であって、これらの置換基は互いに結合して環を形成していてもよい。)
(式中、R43~R50は同一でも異なってもよく水素原子、重水素原子、フッ素原子、塩素原子、シアノ基、トリフルオロメチル基、炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、炭素原子数2ないし6の直鎖状もしくは分岐状のアルケニル基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基であって、これらの置換基は互いに結合して環を形成していてもよい。)
(式中、R51~R55は同一でも異なってもよく水素原子、重水素原子、フッ素原子、塩素原子、シアノ基、トリフルオロメチル基、炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、炭素原子数2ないし6の直鎖状もしくは分岐状のアルケニル基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基であって、これらの置換基は互いに結合して環を形成していてもよい。) - 前記一般式(1)において、Aが前記構造式(B)で示される2価基である、請求項2に記載の有機エレクトロルミネッセンス素子。
- 前記一般式(1)において、Aが前記構造式(B)で示される2価基であって、nが1である、請求項3に記載の有機エレクトロルミネッセンス素子。
- 前記一般式(1)において、Aが単結合である、請求項2に記載の有機エレクトロルミネッセンス素子。
- 前記一般式(1)において、Aが前記構造式(D)で示される2価基である、請求項2に記載の有機エレクトロルミネッセンス素子。
- 前記キャッピング層の厚さが、30nm~120nmの範囲内である、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。
- 前記キャッピング層の屈折率が、該キャッピング層を透過する光の波長が530nm~750nmの範囲内において、1.75以上である、請求項1~7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。
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CN201280044460.3A CN103828485B (zh) | 2011-09-12 | 2012-09-06 | 有机电致发光器件 |
EP12832163.5A EP2757860A4 (en) | 2011-09-12 | 2012-09-06 | ORGANIC ELECTROLUMINESCENCE ELEMENT |
KR1020197035178A KR102181148B1 (ko) | 2011-09-12 | 2012-09-06 | 유기 일렉트로 루미네센스 소자 |
KR1020147009275A KR20140074928A (ko) | 2011-09-12 | 2012-09-06 | 유기 일렉트로 루미네센스 소자 |
JP2013533483A JP6338374B2 (ja) | 2011-09-12 | 2012-09-06 | 有機エレクトロルミネッセンス素子 |
US16/211,756 US20190115542A1 (en) | 2011-09-12 | 2018-12-06 | Organic electroluminescent device |
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JPWO2013038627A1 (ja) | 2015-03-23 |
JP2018110121A (ja) | 2018-07-12 |
KR20190138881A (ko) | 2019-12-16 |
CN105576143B (zh) | 2018-08-07 |
JP6338374B2 (ja) | 2018-06-06 |
CN103828485B (zh) | 2016-06-01 |
TW201623218A (zh) | 2016-07-01 |
KR20140074928A (ko) | 2014-06-18 |
CN103828485A (zh) | 2014-05-28 |
EP2757860A1 (en) | 2014-07-23 |
CN105576143A (zh) | 2016-05-11 |
US20190115542A1 (en) | 2019-04-18 |
JP6581225B2 (ja) | 2019-09-25 |
TWI654168B (zh) | 2019-03-21 |
US20140225100A1 (en) | 2014-08-14 |
TW201319021A (zh) | 2013-05-16 |
EP2757860A4 (en) | 2015-08-05 |
KR102181148B1 (ko) | 2020-11-23 |
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