WO2016111270A1 - 有機エレクトロルミネッセンス素子 - Google Patents
有機エレクトロルミネッセンス素子 Download PDFInfo
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Definitions
- the present invention relates to an organic electroluminescence device, and more specifically, an organic electroluminescence device (hereinafter referred to as an organic EL device) using a specific arylamine compound and a heterocyclic compound having a specific condensed ring structure (and a specific pyrimidine derivative). Abbreviated).
- the organic EL element is a self-luminous element, it is brighter and more visible than a liquid crystal element, and a clear display is possible. Therefore, active research has been done.
- the light emitting layer can also be produced by doping a charge transporting compound generally called a host material with a fluorescent compound, a phosphorescent compound, or a material that emits delayed fluorescence.
- a charge transporting compound generally called a host material with a fluorescent compound, a phosphorescent compound, or a material that emits delayed fluorescence.
- the selection of the organic material in the organic EL element greatly affects various characteristics such as efficiency and durability of the element.
- the light injected from both electrodes is recombined in the light emitting layer to obtain light emission. Therefore, in an organic EL device, it is important how efficiently both holes and electrons are transferred to the light emitting layer, and it is necessary to make the device excellent in carrier balance.
- the probability of recombination of holes and electrons is improved by improving the hole injection property and blocking the electron injected from the cathode, and further excitons generated in the light emitting layer. By confining, high luminous efficiency can be obtained. Therefore, the role of the hole transport material is important, and there is a demand for a hole transport material that has high hole injectability, high hole mobility, high electron blocking properties, and high durability against electrons. ing.
- the heat resistance and amorphousness of the material are also important.
- thermal decomposition occurs even at a low temperature due to heat generated when the element is driven, and the material deteriorates.
- the thin film is crystallized even in a short time, and the element deteriorates. Therefore, the material to be used is required to have high heat resistance and good amorphous properties.
- NPD N, N′-diphenyl-N, N′-di ( ⁇ -naphthyl) benzidine
- various aromatic amine derivatives are known as hole transport materials that have been used in organic EL devices so far.
- NPD has a good hole transport capability, but its glass transition point (Tg), which is an index of heat resistance, is as low as 96 ° C., and device characteristics are degraded by crystallization under high temperature conditions.
- Tg glass transition point
- the aromatic amine derivatives described in Patent Documents 1 and 2 there are compounds having excellent mobility such as hole mobility of 10 ⁇ 3 cm 2 / Vs or more.
- Patent Document 3 reports a highly durable aromatic amine derivative.
- the aromatic amine derivative of Patent Document 3 is used as a charge transport material for an electrophotographic photosensitive member, and no examples of using it as an organic EL element have been studied.
- An arylamine compound having a substituted carbazole structure has been proposed as a compound with improved characteristics such as heat resistance and hole injection properties (see Patent Document 4 and Patent Document 5).
- heat resistance and light emission efficiency have been improved, but they are still insufficient, and further lower driving voltage and higher light emission efficiency can be achieved. It has been demanded.
- the yield of device fabrication is improved by combining materials excellent in hole injection / transport performance, electron injection / transport performance, thin film stability, durability, and the like.
- it is required to improve the device characteristics, realize a carrier with good carrier balance, recombination of holes and electrons with high efficiency, high luminous efficiency, low driving voltage, and long life. ing.
- JP-A-8-048656 Japanese Patent No. 3194657 Japanese Patent No. 4943840 JP 2006-151979 A WO2008 / 62636 Special table 2014-513064 gazette Korean Open Patent 2013-060157 JP-A-7-126615 JP 2005-108804 A
- the object of the present invention is as a material for organic EL devices with high luminous efficiency and durability, hole injection / transport performance, electron injection / transport performance, electron blocking ability, stability in a thin film state, durability Combining various materials for organic EL elements that are superior to each other so that the characteristics of the respective materials can be effectively expressed, (1) high luminous efficiency and power efficiency, and (2) low emission starting voltage. (3) To provide an organic EL device having a low practical driving voltage and (4) a long lifetime.
- the inventors of the present invention have an arylamine-based material that is excellent in hole injection / transport capability, thin film stability and durability, and has a specific condensed ring structure.
- the present inventors variously combine a hole transport material, an arylamine compound as a material of the light emitting layer, and a heterocyclic compound (indenoindole derivative and carbazole derivative) having a condensed ring structure having a specific structure. Create an organic EL device, evaluate its device characteristics, efficiently inject and transport holes to the light emitting layer, and combine materials that match the characteristics of the material of the light emitting layer. investigated.
- pyrimidine derivatives are excellent in electron injection / transport capability, thin film stability and durability. Then, various pyrimidine derivatives are selected as the electron transport material, and various organic EL devices are produced by combining with the hole transport material and the material of the light emitting layer. The device characteristics are intensively evaluated, and electrons are injected into the light emitting layer. We investigated the combination of materials that improved transport efficiency and the carrier balance better matched the characteristics of the material of the light emitting layer.
- the present inventors have made the first positive transport layer a two-layer structure of a first positive hole transport layer and a second positive hole transport layer so that holes can be efficiently injected and transported to the light emitting layer.
- a material for the hole transport layer and selecting a material with excellent electron blocking properties as the material for the second hole transport layer, various organic EL devices with elaborate combinations that can achieve carrier balance are prepared. The characteristics of the device were earnestly evaluated.
- an organic EL device having at least an anode, a hole transport layer, a light emitting layer, an electron transport layer and a cathode in this order
- the hole transport layer contains an arylamine compound represented by the following general formula (1)
- An organic EL device is provided in which the light emitting layer contains an indenoindole derivative represented by the following general formula (2) or a carbazole derivative represented by the following general formula (3).
- Ar 1 to Ar 4 each represents an aromatic hydrocarbon group, an aromatic heterocyclic group, or a condensed polycyclic aromatic group.
- a 1 represents a divalent group of an aromatic hydrocarbon, a divalent group of an aromatic heterocyclic ring, a condensed polycyclic aromatic divalent group or a single bond
- Ar 5 represents an aromatic hydrocarbon group, an aromatic heterocyclic group or a condensed polycyclic aromatic group
- R 1 to R 8 are each a hydrogen atom; a deuterium atom; a fluorine atom; a chlorine atom; a cyano group; a nitro group; an alkyl group having 1 to 6 carbon atoms; a cycloalkyl group having 5 to 10 carbon atoms; An alkenyl group having 2 to 6 atoms; an alkyloxy group having 1 to 6 carbon atoms; a cycloalkyloxy group having 5 to 10 carbon atoms; an aromatic hydrocarbon group; an aromatic heterocyclic group; and a condensed polycyclic aromatic group.
- R 1 to R 4 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
- R 5 to R 8 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
- a part of R 1 to R 4 is desorbed
- R 1 to R 4 Other groups may be bonded via a substituted or unsubstituted methylene group, oxygen atom, sulfur atom or monoarylamino group to form a ring
- a part of R 5 to R 8 is desorbed, and R 5 to R 8 Other groups may be bonded to each other through a substituted or unsubstituted m
- R 9 and R 10 are each an alkyl group having 1 to 6 carbon atoms, an aromatic hydrocarbon group, an aromatic heterocyclic group or a condensed polycyclic aromatic group, and R 9 and R 10 10 may be bonded to each other through a single bond, a substituted or unsubstituted methylene group, an oxygen atom or a sulfur atom to form a ring.
- a 2 represents a divalent group of an aromatic hydrocarbon, a divalent group of an aromatic heterocyclic ring, a condensed polycyclic aromatic divalent group or a single bond
- Ar 6 represents an aromatic hydrocarbon group, an aromatic heterocyclic group or a condensed polycyclic aromatic group
- R 11 to R 18 are each a hydrogen atom; a deuterium atom; a fluorine atom; a chlorine atom; a cyano group; a nitro group; an alkyl group having 1 to 6 carbon atoms; a cycloalkyl group having 5 to 10 carbon atoms.
- R 11 to R 14 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; R 15 to R 18 may combine with each other via a single bond, a substituted or unsubstituted methylene group, an oxygen atom or a sulfur atom to form a ring; A part of R 11 to R 14 is desorbed, and R 11 Other groups of R 14 may be bonded to each other via a substituted or unsubstituted
- the electron transport layer contains a pyrimidine derivative represented by the following general formula (4), Where Ar 7 represents an aromatic hydrocarbon group, an aromatic heterocyclic group or a condensed polycyclic aromatic group, Ar 8 and Ar 9 each represent a hydrogen atom, an aromatic hydrocarbon group, an aromatic heterocyclic group or a condensed polycyclic aromatic group, and Ar 8 and Ar 9 do not simultaneously become a hydrogen atom, B represents a monovalent group represented by the following structural formula (5).
- R 19 to R 22 are each a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, or 1 to 6 carbon atoms.
- the pyrimidine derivative is represented by the following general formula (4a), Where Ar 7 to Ar 9 and B are as shown in the general formula (4).
- the pyrimidine derivative is represented by the following general formula (4b), Where Ar 7 to Ar 9 and B are as shown in the general formula (4).
- B is a monovalent group represented by the following structural formula (5a), Where Ar 10 and R 19 to R 22 are as shown in the structural formula (5), 6)
- the hole transport layer has a two-layer structure of a first hole transport layer and a second hole transport layer, the second hole transport layer is located on the light emitting layer side, and Containing an arylamine compound represented by the general formula (1), 7)
- the light emitting layer contains a red light emitting material, 8)
- the light emitting layer contains a phosphorescent light emitting material, 9)
- the aforementioned phosphorescent light-emitting material is a metal complex containing iridium or platinum, Is preferred.
- an arylamine compound having a specific structure that has excellent hole injection / transport performance, thin film stability, and durability and can effectively express the role of hole injection / transport is used to emit light.
- a light-emitting material having excellent efficiency holes can be efficiently injected and transported to the light-emitting layer, and an organic EL element with high efficiency, low driving voltage, and long life can be realized.
- the combination of the arylamine compound having a specific structure and the material of the light emitting layer having the specific structure can be combined with a specific electron transport material to achieve high efficiency and low driving voltage.
- a long-life organic EL element can be realized.
- the hole transport layer has a two-layer structure of a first hole transport layer and a second hole transport layer, and two kinds of arylamine compounds having a specific structure are considered in consideration of carrier balance and material characteristics.
- an organic EL element with a longer life can be realized.
- FIG. 3 is a diagram showing organic EL element configurations of Examples 1 to 12 and Comparative Examples 1 to 3.
- FIG. 2 is a diagram showing structural formulas of compounds (1-1) to (1-7) which are arylamine compounds of the general formula (1).
- FIG. 2 is a diagram showing structural formulas of compounds (1-8) to (1-14) which are arylamine compounds of general formula (1).
- FIG. 2 is a diagram showing structural formulas of compounds (1-15) to (1-21) which are arylamine compounds of the general formula (1).
- FIG. 2 is a diagram showing the structural formulas of compounds (1-22) to (1-27) which are arylamine compounds of general formula (1).
- FIG. 3 is a diagram showing the structural formulas of compounds (1-28) to (1-33) that are arylamine compounds of general formula (1).
- FIG. 1 is a diagram showing structural formulas of compounds (1-1) to (1-7) which are arylamine compounds of the general formula (1).
- FIG. 2 is a diagram showing structural formulas of compounds (1-8) to
- FIG. 3 is a diagram showing structural formulas of compounds (1-34) to (1-39) which are arylamine compounds of the general formula (1).
- FIG. 4 is a diagram showing structural formulas of compounds (1-40) to (1-45) which are arylamine compounds of the general formula (1).
- FIG. 2 is a diagram showing structural formulas of compounds (1-46) to (1-50) which are arylamine compounds of the general formula (1).
- FIG. 2 is a diagram showing structural formulas of compounds (1-51) to (1-55) that are arylamine compounds of the general formula (1).
- FIG. 2 is a diagram showing structural formulas of compounds (1-56) to (1-59) which are arylamine compounds of the general formula (1).
- FIG. 2 is a diagram showing structural formulas of compounds (1-60) to (1-64) which are arylamine compounds of the general formula (1).
- FIG. 2 is a diagram showing structural formulas of compounds (1-65) to (1-70) which are arylamine compounds of the general formula (1).
- FIG. 2 is a diagram showing structural formulas of compounds (1-71) to (1-76) which are arylamine compounds of the general formula (1).
- FIG. 2 is a diagram showing the structural formulas of compounds (1-77) to (1-81), which are arylamine compounds of general formula (1).
- FIG. 2 is a diagram showing structural formulas of compounds (1-82) to (1-87) which are arylamine compounds of the general formula (1).
- FIG. 2 is a diagram showing the structural formulas of compounds (1-88) to (1-93) which are arylamine compounds of general formula (1).
- FIG. 2 is a diagram showing the structural formulas of compounds (1-94) to (1-99), which are arylamine compounds of general formula (1).
- FIG. 2 is a diagram showing structural formulas of compounds (1-100) to (1-105) which are arylamine compounds of the general formula (1).
- FIG. 3 is a diagram showing the structural formulas of compounds (2-1) to (2-5), which are indenoindole derivatives of the general formula (2).
- FIG. 3 is a diagram showing the structural formulas of compounds (2-6) to (2-10) which are indenoindole derivatives of the general formula (2).
- FIG. 2 is a diagram showing the structural formulas of compounds (2-11) to (2-15), which are indenoindole derivatives of the general formula (2).
- FIG. 3 is a diagram showing structural formulas of compounds (3-1) to (3-6) which are carbazole derivatives of the general formula (3).
- FIG. 3 is a diagram showing the structural formulas of compounds (3-7) to (3-12) which are carbazole derivatives of the general formula (3).
- FIG. 3 is a diagram showing structural formulas of compounds (3-13) to (3-18) which are carbazole derivatives of the general formula (3).
- FIG. 3 is a diagram showing structural formulas of compounds (3-19) to (3-23) which are carbazole derivatives of the general formula (3).
- FIG. 3 is a diagram showing the structural formulas of compounds (4-1) to (4-6) which are pyrimidine derivatives of the general formula (4).
- FIG. 6 is a diagram showing the structural formulas of compounds (4-7) to (4-11) which are pyrimidine derivatives of the general formula (4).
- FIG. 4 is a diagram showing the structural formulas of compounds (4-12) to (4-16), which are pyrimidine derivatives of the general formula (4).
- FIG. 4 is a diagram showing the structural formulas of compounds (4-17) to (4-21) which are pyrimidine derivatives of the general formula (4).
- FIG. 3 is a diagram showing the structural formulas of compounds (4-22) to (4-26), which are pyrimidine derivatives of the general formula (4).
- FIG. 3 is a diagram showing the structural formulas of compounds (4-27) to (4-31) that are pyrimidine derivatives of the general formula (4).
- FIG. 3 is a diagram showing structural formulas of compounds (4-32) to (4-36) that are pyrimidine derivatives of the general formula (4).
- FIG. 4 is a diagram showing structural formulas of compounds (4-37) to (4-41) that are pyrimidine derivatives of the general formula (4).
- FIG. 4 is a diagram showing structural formulas of compounds (4-42) to (4-46) which are pyrimidine derivatives of the general formula (4).
- FIG. 4 is a diagram showing structural formulas of compounds (4-47) to (4-51) which are pyrimidine derivatives of the general formula (4).
- FIG. 5 is a diagram showing the structural formulas of compounds (4-52) to (4-56) which are pyrimidine derivatives of the general formula (4).
- FIG. 5 is a diagram showing the structural formulas of compounds (4-57) to (4-61) that are pyrimidine derivatives of the general formula (4).
- FIG. 3 is a diagram showing the structural formulas of compounds (4-62) to (4-66) that are pyrimidine derivatives of the general formula (4).
- FIG. 4 is a diagram showing the structural formulas of compounds (4-67) to (4-71) that are pyrimidine derivatives of the general formula (4).
- FIG. 4 is a diagram showing structural formulas of compounds (4-72) to (4-76) which are pyrimidine derivatives of the general formula (4).
- FIG. 3 is a diagram showing the structural formulas of compounds (4-77) to (4-80) that are pyrimidine derivatives of the general formula (4).
- FIG. 3 is a diagram showing the structural formulas of compounds (4-81) to (4-84) that are pyrimidine derivatives of the general formula (4).
- FIG. 5 is a diagram showing the structural formulas of compounds (4-85) to (4-88) which are pyrimidine derivatives of the general formula (4).
- FIG. 3 is a diagram showing the structural formulas of compounds (4-89) to (4-92) that are pyrimidine derivatives of the general formula (4).
- FIG. 2 is a diagram showing the structural formulas of compounds (4-93) to (4-96) that are pyrimidine derivatives of the general formula (4).
- FIG. 4 is a diagram showing the structural formulas of compounds (4-97) to (4-100) that are pyrimidine derivatives of the general formula (4).
- FIG. 3 is a diagram showing the structural formulas of compounds (4-101) to (4-104) that are pyrimidine derivatives of the general formula (4).
- FIG. 2 is a diagram showing the structural formulas of compounds (4-105) to (4-108) that are pyrimidine derivatives of the general formula (4).
- FIG. 4 is a diagram showing the structural formulas of compounds (4-109) to (4-112) that are pyrimidine derivatives of the general formula (4).
- FIG. 5 is a diagram showing the structural formulas of compounds (4-113) to (4-116) which are pyrimidine derivatives of the general formula (4).
- FIG. 4 is a diagram showing the structural formulas of compounds (4-117) to (4-120) which are pyrimidine derivatives of the general formula (4).
- FIG. 4 is a diagram showing the structural formulas of compounds (4-121) to (4-124) which are pyrimidine derivatives of the general formula (4).
- FIG. 3 is a diagram showing the structural formulas of compounds (4-125) and (4-126), which are pyrimidine derivatives of the general formula (4).
- FIG. 5 is a diagram showing the structural formulas of compounds (6-1) to (6-5), which are triarylamine compounds of general formula (6).
- FIG. 6 is a diagram showing the structural formulas of compounds (6-6) to (6-10), which are triarylamine compounds of general formula (6).
- FIG. 5 is a diagram showing the structural formulas of compounds (6-11) to (6-15), which are triarylamine compounds of general formula (6).
- FIG. 6 is a diagram showing the structural formulas of compounds (6-16) to (6-20), which are triarylamine compounds of general formula (6).
- FIG. 3 is a diagram showing the structural formulas of compounds (6-21) to (6-23), which are triarylamine compounds of general formula (6).
- FIG. 3 is a diagram showing the structural formulas of compounds (6′-1) and (6′-2) other than the triarylamine compound of the general formula (6) among the triarylamine compounds having two triarylamine structures.
- FIG. 5 is a diagram showing the structural formulas of compounds (7-1) to (7-5), which are triarylamine compounds of general formula (7).
- FIG. 6 is a diagram showing the structural formulas of compounds (7-6) to (7-9), which are triarylamine compounds of general formula (7).
- FIG. 5 is a diagram showing the structural formulas of compounds (7-10) to (7-13), which are triarylamine compounds of general formula (7).
- FIG. 6 is a diagram showing the structural formulas of compounds (7-14) to (7-17), which are triarylamine compounds of general formula (7).
- the organic EL device of the present invention has a basic structure in which an anode, a hole transport layer, a light emitting layer, an electron transport layer, and a cathode are provided in this order on a substrate such as a glass substrate or a transparent plastic substrate (for example, a polyethylene terephthalate substrate).
- a substrate such as a glass substrate or a transparent plastic substrate (for example, a polyethylene terephthalate substrate).
- the layer structure can take various forms, for example, an electron blocking layer is provided between the hole transport layer and the light emitting layer, or the light emitting layer and the electron transport layer. It is possible to provide a hole blocking layer between them, and an electron injection layer between the electron transport layer and the cathode. It is also possible to omit or double some organic layers.
- a layer that serves as a hole injection layer and a hole transport layer is formed, or a layer that serves as an electron injection layer and an electron transport layer is formed. It is also possible. It is also possible to have a structure in which two or more organic layers having the same function are laminated. Specifically, a structure in which two hole transport layers are laminated, a structure in which two light emitting layers are laminated, an electron A configuration in which two transport layers are laminated is also possible.
- the hole transport layer preferably has a structure in which two layers of a first hole transport layer and a second hole transport layer are laminated.
- FIG. 1 shows a layer configuration employed in an example described later.
- a transparent anode 2 On a glass substrate 1, a transparent anode 2, a hole injection layer 3, a hole transport layer 5, a light emitting layer 6, an electron transport.
- the layer 7, the electron injection layer 8, and the cathode 9 are formed in this order, and the hole transport layer 5 has a layer configuration in which the first hole transport layer 5a and the second hole transport layer 5b are two layers. ing.
- each layer which comprises the organic EL element of this invention is demonstrated.
- the anode 2 is provided on the transparent substrate 1 by vapor deposition of an electrode material having a large work function such as ITO or gold.
- a hole injection layer 3 may be provided between the anode 2 and the hole transport layer 5 as necessary.
- the hole injection layer 3 includes a known material such as a starburst type triphenylamine derivative; various triphenylamine tetramers; a porphyrin compound represented by copper phthalocyanine; an acceptor property such as hexacyanoazatriphenylene. Heterocyclic compounds; coating-type polymer materials; and the like can be used.
- the arylamine compound of General formula (1) mentioned later, the triarylamine compound of General formula (6), or the triarylamine compound of General formula (7) can also be used.
- the hole injection layer 3 it is preferable to use a triarylamine compound of the general formula (6) or the general formula (7). This is because these (tri) arylamine compounds have high hole mobility.
- the (tri) arylamine compound of the general formula (1), (6) or (7) is used for the hole injection layer 3, the composition of the hole injection layer 3 and the composition of the hole transport layer 5 are different. Must be.
- These materials may be used alone for film formation, or may be mixed with other materials for film formation. Further, trisbromophenylamine hexachloroantimony, a P-doped raradiene derivative (see International Publication No. 2014/009310) or a polymer compound having a partial structure of a benzidine derivative such as TPD may be used. Good.
- the hole injection layer 3 can be obtained.
- each layer described below can be obtained by forming a thin film by a known method such as a spin coating method or an ink jet method in addition to the vapor deposition method.
- the hole transport layer 5 is provided between the anode 2 and the light emitting layer 6.
- the hole transport layer 5 includes an arylamine compound represented by the following general formula (1). (In this specification, it may be abbreviated as “arylamine compound of general formula (1)”). This is because the arylamine compound of the general formula (1) has high hole mobility, and therefore can improve the hole transport efficiency from the hole transport layer to the light emitting layer.
- Arylamine compounds of general formula (1) are Arylamine compounds of general formula (1);
- Ar 1 to Ar 4 each represents an aromatic hydrocarbon group, an aromatic heterocyclic group, or a condensed polycyclic aromatic group.
- Aromatic hydrocarbon groups represented by Ar 1 ⁇ Ar 4 the aromatic heterocyclic group or condensed polycyclic aromatic group, specifically, a phenyl group, biphenylyl group, terphenylyl group, a naphthyl group, anthracenyl group, phenanthrenyl Group, fluorenyl group, indenyl group, pyrenyl group, perylenyl group, fluoranthenyl group, triphenylenyl group, pyridyl group, pyrimidinyl group, triazinyl group, furyl group, pyrrolyl group, thienyl group, quinolyl group, isoquinolyl group, quinazolinyl group, benzofuranyl group Group, benzothienyl group, indolyl group, carbazolyl group, benz
- the aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group represented by Ar 1 to Ar 4 may be unsubstituted or may have a substituent.
- substituents include the following groups in addition to a deuterium atom, a cyano group, and a nitro group.
- a halogen atom such as a fluorine atom, a chlorine atom, a bromine atom, an iodine atom
- Alkyl groups having 1 to 6 carbon atoms such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl An n-hexyl group
- An alkenyl group such as a vinyl group, an allyl group
- An aryloxy group such as a phenyloxy group, a tolyloxy group
- Arylalkyloxy groups such as benzyloxy group, phenethyloxy group
- Aromatic hydrocarbon group or condensed polycyclic aromatic group for example,
- substituents may be further substituted with the substituents exemplified above. These substituents may be present independently of each other to form a ring, but are bonded to each other through a single bond, a substituted or unsubstituted methylene group, an oxygen atom or a sulfur atom. A ring may be formed.
- Ar 1 to Ar 4 are preferably an aromatic hydrocarbon group, an oxygen-containing aromatic heterocyclic group or a condensed polycyclic aromatic group, and include a phenyl group, a biphenylyl group, a terphenylyl group, a naphthyl group, a phenanthrenyl group, a triphenylenyl group, a fluorenyl group. Group and dibenzofuranyl group are more preferable.
- Examples of the substituent that the aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group represented by Ar 1 to Ar 4 may have include a deuterium atom and an alkyl having 1 to 6 carbon atoms.
- Group, an alkenyl group having 2 to 6 carbon atoms, an aromatic hydrocarbon group, an oxygen-containing aromatic heterocyclic group or a condensed polycyclic aromatic group is preferable, and a deuterium atom, phenyl group, biphenylyl group, naphthyl group, dibenzofura Nyl group and vinyl group are more preferable.
- Ar 1 to Ar 4 are bonded to each other through a single bond to form a condensed aromatic ring.
- Ar 1 and Ar 2 are different groups, or Ar 3 and Ar 4 are different groups, and Ar 1 and Ar 2 are different groups and Ar 3 and Ar 4 are different groups. Is more preferable.
- “Different” includes not only the case where the basic structure is different, but also the case where the basic structure is the same and the substituents are different, or the case where the basic structure and substituents are the same and the positions of the substituents are different. .
- a skeleton in which all the bonds are 1,4-bonds (for example, 4,4 ′′-) from the viewpoint of the stability of the thin film that affects the device lifetime (for example, 4,4 ′′- Diamino- [1,1 ′; 4 ′, 1 ′′] terphenyl skeleton) is not preferred, and skeletons containing 1,2-bonds or 1,3-linkages are preferred, ie as shown below A skeleton in which phenylene groups are not linearly linked is preferable.
- FIGS. 2 to 19 Specific examples of preferred compounds among the arylamine compounds represented by the general formula (1) are shown in FIGS. 2 to 19, but such arylamine compounds are not limited to these compounds.
- D in the structural formula represents deuterium.
- compounds corresponding to the formula (1a-a) are (1-1) to (1-3), (1-5) to (1-7). , (1-9) to (1-10), (1-12), (1-14), (1-18) to (1-20), (1-25) to (1-26), ( 1-28), (1-33) to (1-34), (1-45), (1-94) to (1-97) and (1-104).
- the compounds corresponding to the formula (1a-b) are (1-15), (1-40), (1-43) to (1-44) and (1-47).
- the compounds corresponding to the formula (1b-a) are (1-23), (1-38) to (1-39), (1-41) to (1-42) and (1-103).
- Compounds corresponding to the formula (1c-a) are (1-24), (1-27), (1-30) to (1-32), (1-35) to (1-37), (1 -93) and (1-99) to (1-100).
- the compounds corresponding to formula (1c-b) are (1-22), (1-29), (1-46), (1-48) to (1-65), (1-98) and (1 ⁇ 105).
- the compound corresponding to the formula (1c-c) is (1-21).
- the arylamine compound represented by the general formula (1) can be synthesized by a known method such as Suzuki coupling.
- Purification of the arylamine compound represented by the general formula (1) may be performed by purification by column chromatography, adsorption purification by silica gel, activated carbon, activated clay, etc., recrystallization or crystallization by a solvent, sublimation purification method, etc. it can.
- Other compounds used in the organic EL device of the present invention are also purified by column chromatography, adsorption purification by silica gel, activated carbon, activated clay, etc., and resolving by a solvent, like the arylamine compound represented by the general formula (1).
- the compound can be identified by NMR analysis. As physical properties, glass transition point (Tg) and work function can be measured.
- Glass transition point (Tg) is an indicator of the stability of the thin film state.
- the glass transition point (Tg) can be measured with a high-sensitivity differential scanning calorimeter (manufactured by Bruker AXS, DSC3100SA) using powder.
- Work function is an indicator of hole transportability.
- the work function can be measured with an ionization potential measuring device (PYS-202, manufactured by Sumitomo Heavy Industries, Ltd.) by forming a 100 nm thin film on the ITO substrate.
- PYS-202 manufactured by Sumitomo Heavy Industries, Ltd.
- the arylamine compound of the general formula (1) may be used alone for film formation, but may be mixed with other materials for film formation.
- Examples of the hole transporting material that can be mixed with or simultaneously used with the arylamine compound of the general formula (1) include the following.
- Benzidine derivatives such as N, N′-diphenyl-N, N′-di (m-tolyl) benzidine (TPD), N, N′-diphenyl-N, N′-di ( ⁇ -naphthyl) benzidine (NPD), N, N, N ′, N′-tetrabiphenylylbenzidine; 1,1-bis [4- (di-4-tolylamino) phenyl] cyclohexane (TAPC);
- trisbromophenylamine hexachloroantimony, a P-doped radialene derivative (see International Publication No. 2014/009310) or a polymer compound having a partial structure of a benzidine derivative such as TPD is used in combination. Also good.
- the hole transport layer 5 includes, for example, as shown in FIG. 1, the first hole transport layer 5a located on the anode 2 side and the second hole transport located on the light emitting layer 6 side. It is preferable to have a two-layer structure with the layer 5b. The hole transport layer 5 having such a two-layer structure will be described later.
- the light-emitting layer 6 is an indenoindole derivative represented by the following general formula (2) (sometimes abbreviated as “indenoindole derivative of the general formula (2)” in this specification) or It is important to include a carbazole derivative represented by the following general formula (3) (sometimes abbreviated as “carbazole derivative of general formula (3)” in this specification).
- a 1 represents an aromatic hydrocarbon divalent group, an aromatic heterocyclic divalent group, a condensed polycyclic aromatic divalent group or a single bond.
- the aromatic hydrocarbon divalent group, aromatic heterocyclic divalent group or condensed polycyclic aromatic divalent group represented by A 1 is an aromatic hydrocarbon, aromatic heterocyclic ring or condensed polycyclic aromatic group. It is a divalent group formed by removing two hydrogen atoms from a hydrogen atom.
- aromatic hydrocarbon, aromatic heterocyclic ring or condensed polycyclic aromatic in this case include benzene, biphenyl, terphenyl, tetrakisphenyl, styrene, naphthalene, anthracene, acenaphthalene, fluorene, phenanthrene, indane, Pyrene, triphenylene, pyridine, pyrimidine, triazine, pyrrole, furan, thiophene, quinoline, isoquinoline, benzofuran, benzothiophene, indoline, carbazole, carboline, benzoxazole, benzothiazole, quinoxaline, benzimidazole, pyrazole, dibenzofuran, dibenzothiophene, naphthyridine , Phenanthroline, acridine and the like.
- Divalent aromatic hydrocarbon represented by A 1 divalent divalent group or condensed polycyclic aromatic-aromatic heterocyclic ring may be unsubstituted but may have a substituent.
- the aromatic hydrocarbon group, the aromatic heterocyclic group or the condensed polycyclic aromatic represented by Ar 1 to Ar 4 in the general formula (1) may be shown. The same thing can be given. The aspect which a substituent can take is also the same.
- a 1 is preferably an aromatic hydrocarbon divalent group, a condensed polycyclic aromatic divalent group or a single bond, and a divalent group or single bond formed by removing two hydrogen atoms from benzene, biphenyl or naphthalene. More preferred is a divalent group or a single bond formed by removing two hydrogen atoms from benzene.
- Ar 5 represents an aromatic hydrocarbon group, an aromatic heterocyclic group or a condensed polycyclic aromatic group.
- aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group represented by Ar 5 an aromatic hydrocarbon group represented by Ar 1 to Ar 4 in the general formula (1), The thing similar to what was shown regarding the aromatic heterocyclic group or condensed polycyclic aromatic group can be mention
- the aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group represented by Ar 5 may be unsubstituted or may have a substituent.
- the aromatic hydrocarbon group represented by Ar 1 to Ar 4 in the general formula (1), the aromatic heterocyclic group, or the condensed polycyclic aromatic group may have a substituent.
- the same thing can be given.
- the aspect which a substituent can take is also the same.
- a phenyl group, a biphenylyl group, a naphthyl group or an aromatic heterocyclic group is preferable, and an aromatic heterocyclic group is particularly preferable.
- aromatic heterocyclic groups triazinyl group, quinazolinyl group, naphthopyrimidinyl group, benzoimidazolyl group, pyridopyrimidinyl group, naphthyridinyl group, pyridyl group, quinolyl group, and isoquinolyl group are particularly preferable.
- R 1 to R 8 are each a hydrogen atom; a deuterium atom; a fluorine atom; a chlorine atom; a cyano group; a nitro group; an alkyl group having 1 to 6 carbon atoms; Cycloalkyl group having 10 to 6 carbon atoms; alkenyl group having 2 to 6 carbon atoms; alkyloxy group having 1 to 6 carbon atoms; cycloalkyloxy group having 5 to 10 carbon atoms; aromatic hydrocarbon group; aromatic heterocyclic group A condensed polycyclic aromatic group; an aryloxy group; or a disubstituted amino group having an aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group as a substituent.
- the alkyl group having 1 to 6 carbon atoms, the alkenyl group having 2 to 6 carbon atoms, and the alkyloxy group having 1 to 6 carbon atoms may be linear or branched.
- alkyl group having 1 to 6 carbon atoms, the cycloalkyl group having 5 to 10 carbon atoms or the alkenyl group having 2 to 6 carbon atoms represented by R 1 to R 8 include a 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, cyclopentyl group, cyclohexyl group, 1-adamantyl group, Examples thereof include 2-adamantyl group, vinyl group, allyl group, isopropenyl group, 2-butenyl group and the like.
- the alkyl group having 1 to 6 carbon atoms, the cycloalkyl group having 5 to 10 carbon atoms, or the alkenyl group having 2 to 6 carbon atoms represented by R 1 to R 8 may be unsubstituted but has a substituent. May be.
- substituents include the following groups in addition to a deuterium atom, a cyano group, and a nitro group.
- a halogen atom such as a fluorine atom, a chlorine atom, a bromine atom, an iodine atom;
- An alkenyl group such as a vinyl group, an allyl group;
- An aryloxy group such as a phenyloxy group, a tolyloxy group;
- Arylalkyloxy groups such as benzyloxy group, phenethyloxy group;
- Aromatic hydrocarbon group or condensed polycyclic aromatic group such as phenyl group, biphenylyl group, terphenylyl group, naphthyl group, anthracenyl group, phenanthrenyl group, fluorenyl group, indenyl group, pyrenyl group, perylenyl group, fluoranthenyl group A triphenyleny
- substituents may be further substituted with the substituents exemplified above. These substituents may be present independently of each other to form a ring, but are bonded to each other through a single bond, a substituted or unsubstituted methylene group, an oxygen atom or a sulfur atom. A ring may be formed.
- alkyloxy group having 1 to 6 carbon atoms or the cycloalkyloxy group having 5 to 10 carbon atoms represented by R 1 to R 8 include a methyloxy group, an ethyloxy group, and an n-propyloxy group. , Isopropyloxy group, n-butyloxy group, tert-butyloxy group, n-pentyloxy group, n-hexyloxy group, cyclopentyloxy group, cyclohexyloxy group, cycloheptyloxy group, cyclooctyloxy group, 1-adamantyloxy group , 2-adamantyloxy group and the like.
- the alkyloxy group having 1 to 6 carbon atoms or the cycloalkyloxy group having 5 to 10 carbon atoms represented by R 1 to R 8 may be unsubstituted or may have a substituent.
- the substituent include an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 5 to 10 carbon atoms, or a group having 2 to 6 carbon atoms represented by R 1 to R 8 in the general formula (2).
- lifted The aspect which a substituent can take is also the same.
- Examples of the aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group represented by R 1 to R 8 include aromatic carbon groups represented by Ar 1 to Ar 4 in the general formula (1).
- the thing similar to what was shown regarding the hydrogen group, the aromatic heterocyclic group, or the condensed polycyclic aromatic group can be mention
- the aromatic hydrocarbon group represented by Ar 1 to Ar 4 in the general formula (1), the aromatic heterocyclic group, or the condensed polycyclic aromatic group may have a substituent.
- the same thing can be given.
- the aspect which a substituent can take is also the same.
- aryloxy group represented by R 1 to R 8 include a phenyloxy group, a biphenylyloxy group, a terphenylyloxy group, a naphthyloxy group, an anthracenyloxy group, and a phenanthrenyloxy group. Fluorenyloxy group, indenyloxy group, pyrenyloxy group, perylenyloxy group, and the like.
- the aryloxy group represented by R 1 to R 8 may be unsubstituted or may have a substituent.
- the aromatic hydrocarbon group represented by Ar 1 to Ar 4 in the general formula (1), the aromatic heterocyclic group, or the condensed polycyclic aromatic group may have a substituent. The same thing can be given. The aspect which a substituent can take is also the same.
- the condensed polycyclic aromatic group includes those shown for the aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group represented by Ar 1 to Ar 4 in the general formula (1). The same can be mentioned.
- the disubstituted amino group represented by R 1 to R 8 may be unsubstituted or may further have a substituent.
- the aromatic hydrocarbon group represented by Ar 1 to Ar 4 in the general formula (1), the aromatic heterocyclic group, or the condensed polycyclic aromatic group may have a substituent.
- the same thing can be given.
- the aspect which a substituent can take is also the same.
- R 1 to R 4 may be present independently and do not form a ring, but are a single bond, a substituted or unsubstituted methylene group such as compound 2-14 and compound 2-15 in FIG. May be bonded to each other via an oxygen atom or a sulfur atom to form a ring.
- R 5 to R 8 may be independently present and may not form a ring, but may be 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. Further, for example, as in compounds 2-1 to 2-5 of FIG.
- R 1 to R 4 a part of R 1 to R 4 is eliminated, and other groups of R 1 to R 4 are present in the vacancies generated by this elimination. May be bonded via a substituted or unsubstituted methylene group, oxygen atom, sulfur atom or monoarylamino group to form a ring.
- R 5 to R 8 a part of R 5 to R 8 is eliminated, and another group of R 5 to R 8 is substituted with a substituted or unsubstituted methylene group, oxygen atom, sulfur atom or mono
- a ring may be formed by bonding via an arylamino group.
- R 1 ⁇ R 8 as described above forms a ring
- the embodiment contributes group in the ring formation is di-substituted amino group
- each other R 1 ⁇ R 8 is an aromatic having di-substituted amino group
- R 1 to R 4 a part of R 1 to R 4 is eliminated, and another group (disubstituted amino group) of R 1 to R 4 is an aromatic group having a disubstituted amino group at a vacancy generated by the elimination.
- a part of R 5 to R 8 is eliminated, and the other group (disubstituted amino group) of R 5 to R 8 is a fragrance possessed by the disubstituted amino group at the vacancy generated by this elimination.
- the aryl group in the monoarylamino group that serves as a linking group in ring formation includes an aromatic hydrocarbon group, an aromatic heterocyclic group, or a condensed group represented by Ar 1 to Ar 4 in the general formula (1).
- lifted The thing similar to what was shown regarding the polycyclic aromatic group can be mention
- these groups may have a substituent, and as the substituent, an aromatic hydrocarbon group, an aromatic heterocyclic group, or a condensed polyvalent group represented by Ar 1 to Ar 4 in the general formula (1).
- lifted The aspect which a substituent can take is also the same.
- any one of R 1 to R 4 is an aromatic hydrocarbon group, an aromatic heterocyclic group or a condensed polycyclic aromatic group, and these groups Are bonded to each other via a benzene ring to which R 1 to R 4 are bonded and a linking group such as a substituted or unsubstituted methylene group, oxygen atom, sulfur atom or monoarylamino group to form a ring. preferable.
- the aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group is preferably a phenyl group, an indenyl group, an indolyl group, a benzofuranyl group or a benzothienyl group, and these groups are R 1 to R 4 fluorene ring with a benzene ring which is bonded, a carbazole ring, a dibenzofuran ring, a dibenzothiophene ring, indeno indole ring, indeno benzofuran ring, indenobenzothiophene ring, benzo furo indole ring, benzo thieno indole ring, indolo
- An embodiment in which an indole ring is formed is preferred.
- the embodiments represented by the following general formulas (2a) to (2c) are particularly preferable.
- R 1 to R 4 are an alkenyl group having 2 to 6 carbon atoms, an aromatic hydrocarbon group, an aromatic heterocyclic group or a condensed polycyclic aromatic group, and two adjacent groups ( In a preferred embodiment, R 1 to R 4 ) are bonded to each other through a single bond, and these groups form a condensed ring together with the benzene ring to which R 1 to R 4 are bonded.
- the alkenyl group having 2 to 6 carbon atoms, aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group is preferably a vinyl group or a phenyl group, that is, R 1 to R 4 are
- R 1 to R 4 are
- An embodiment in which a naphthalene ring, a phenanthrene ring or a triphenylene ring is formed together with the bonded benzene ring is preferable.
- an embodiment represented by the following general formula (2d) or (2e) is particularly preferable.
- X represents a substituted or unsubstituted methylene group, oxygen atom, sulfur atom or monoarylamino group, and A 1 , Ar 5 and R 1 to R 10 are as shown in the general formula (2). Represents the meaning of
- R 5 to R 8 are vinyl groups and the two adjacent vinyl groups are bonded to each other via a single bond to form a condensed ring, that is, R 5 to
- An embodiment in which a naphthalene ring or a phenanthrene ring is formed together with a benzene ring to which R 8 is bonded is also preferred.
- R 9 and R 10 are each an alkyl group having 1 to 6 carbon atoms, an aromatic hydrocarbon group, an aromatic heterocyclic group, or a condensed polycyclic aromatic group.
- the alkyl group having 1 to 6 carbon atoms may be linear or branched.
- Examples of the alkyl group having 1 to 6 carbon atoms represented by R 9 and R 10 are the alkyl groups having 1 to 6 carbon atoms represented by R 1 to R 8 in the general formula (2). The same thing can be given.
- the alkyl group having 1 to 6 carbon atoms represented by R 9 and R 10 may be unsubstituted or may have a substituent.
- Examples of the substituent include an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 5 to 10 carbon atoms, or a group having 2 to 6 carbon atoms represented by R 1 to R 8 in the general formula (2).
- the thing similar to what was shown as a substituent which an alkenyl group may have can be mention
- the aspect which a substituent can take is also the same.
- Examples of the aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group represented by R 9 and R 10 include aromatic carbon groups represented by Ar 1 to Ar 4 in the general formula (1).
- the thing similar to what was shown regarding the hydrogen group, the aromatic heterocyclic group, or the condensed polycyclic aromatic group can be mention
- the aromatic hydrocarbon group represented by Ar 1 to Ar 4 in the general formula (1), the aromatic heterocyclic group, or the condensed polycyclic aromatic group may have a substituent.
- the same thing can be given.
- the aspect which a substituent can take is also the same.
- R 9 and R 10 an alkyl group having 1 to 6 carbon atoms is preferable, and a methyl group is particularly preferable.
- R 9 and R 10 may be independently present to form a ring, but are 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. May be.
- a 2 represents an aromatic hydrocarbon divalent group, an aromatic heterocyclic divalent group, a condensed polycyclic aromatic divalent group or a single bond.
- the divalent group of the aromatic hydrocarbon represented by A 2 , the divalent group of the aromatic heterocyclic ring or the divalent group of the condensed polycyclic aromatic is represented by A 1 in the general formula (2). Examples thereof include those similar to those shown for the aromatic hydrocarbon divalent group, aromatic heterocyclic divalent group or condensed polycyclic aromatic divalent group. These divalent groups may be unsubstituted or may have a substituent.
- the aromatic hydrocarbon group, the aromatic heterocyclic group or the condensed polycyclic aromatic represented by Ar 1 to Ar 4 in the general formula (1) may be shown. The same thing can be given. The aspect which a substituent can take is also the same.
- a 2 is preferably an aromatic hydrocarbon divalent group, a condensed polycyclic aromatic divalent group or a single bond, and a divalent group or single bond formed by removing two hydrogen atoms from benzene, biphenyl or naphthalene. More preferred is a divalent group or a single bond formed by removing two hydrogen atoms from benzene.
- Ar 6 represents an aromatic hydrocarbon group, an aromatic heterocyclic group or a condensed polycyclic aromatic group.
- aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group represented by Ar 6 an aromatic hydrocarbon group represented by Ar 1 to Ar 4 in the general formula (1).
- lifted These groups may be unsubstituted or may have a substituent.
- the aromatic hydrocarbon group represented by Ar 1 to Ar 4 in the general formula (1), the aromatic heterocyclic group, or the condensed polycyclic aromatic group may have a substituent.
- the same thing can be given.
- the aspect which a substituent can take is also the same.
- a phenyl group, a biphenylyl group, a naphthyl group or an aromatic heterocyclic group is preferable, and an aromatic heterocyclic group is particularly preferable.
- aromatic heterocyclic groups triazinyl group, quinazolinyl group, naphthopyrimidinyl group, benzoimidazolyl group, pyridopyrimidinyl group, naphthyridinyl group, pyridyl group, quinolyl group, and isoquinolyl group are particularly preferable.
- R 11 to R 18 are each a hydrogen atom; a deuterium atom; a fluorine atom; a chlorine atom; a cyano group; a nitro group; an alkyl group having 1 to 6 carbon atoms; Cycloalkyl group having 10 to 6 carbon atoms; alkenyl group having 2 to 6 carbon atoms; alkyloxy group having 1 to 6 carbon atoms; cycloalkyloxy group having 5 to 10 carbon atoms; aromatic hydrocarbon group; aromatic heterocyclic group A condensed polycyclic aromatic group; an aryloxy group; or a disubstituted amino group having an aromatic hydrocarbon group, an aromatic heterocyclic group or a condensed polycyclic aromatic group as a substituent.
- the alkyl group having 1 to 6 carbon atoms, the alkenyl group having 2 to 6 carbon atoms, and the alkyloxy group having 1 to 6 carbon atoms may be linear or branched
- Examples of the alkyl group having 1 to 6 carbon atoms, the cycloalkyl group having 5 to 10 carbon atoms, or the alkenyl group having 2 to 6 carbon atoms represented by R 11 to R 18 include those in the general formula (2). Examples of the alkyl group having 1 to 6 carbon atoms, the cycloalkyl group having 5 to 10 carbon atoms or the alkenyl group having 2 to 6 carbon atoms represented by R 1 to R 8 are the same. Can do. These groups may be unsubstituted or may have a substituent.
- substituents examples include an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 5 to 10 carbon atoms, or a group having 2 to 6 carbon atoms represented by R 1 to R 8 in the general formula (2).
- lifted The aspect which a substituent can take is also the same.
- the alkyloxy group having 1 to 6 carbon atoms or the cycloalkyloxy group having 5 to 10 carbon atoms represented by R 11 to R 18 is represented by R 1 to R 8 in the general formula (2).
- Examples of the alkyloxy group having 1 to 6 carbon atoms or the cycloalkyloxy group having 5 to 10 carbon atoms are the same as those described above. These groups may be unsubstituted or may have a substituent.
- Examples of the substituent include an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 5 to 10 carbon atoms, or a group having 2 to 6 carbon atoms represented by R 1 to R 8 in the general formula (2).
- the thing similar to what was shown as a substituent which an alkenyl group may have can be mention
- the aspect which a substituent can take is also the same.
- the aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group represented by R 11 to R 18 is an aromatic carbon group represented by R 1 to R 8 in the general formula (2).
- lifted These groups may be unsubstituted or may have a substituent.
- the aromatic hydrocarbon group represented by Ar 1 to Ar 4 in the general formula (1), the aromatic heterocyclic group, or the condensed polycyclic aromatic group may have a substituent.
- the same thing can be given.
- the aspect which a substituent can take is also the same.
- Examples of the aryloxy group represented by R 11 to R 18 include the same aryloxy groups represented by R 1 to R 8 in the general formula (2).
- the aryloxy group represented by R 11 to R 18 may be unsubstituted or may have a substituent.
- the aromatic hydrocarbon group represented by Ar 1 to Ar 4 in the general formula (1), the aromatic heterocyclic group, or the condensed polycyclic aromatic group may have a substituent. The same thing can be given. The aspect which a substituent can take is also the same.
- Examples of the disubstituted amino group represented by R 11 to R 18 include the same ones as shown for the disubstituted amino group represented by R 1 to R 8 in the general formula (2). .
- the disubstituted amino group represented by R 11 to R 18 may be unsubstituted or may further have a substituent.
- the substituent which the aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group represented by Ar 1 to Ar 4 in the general formula (1) may have The thing similar to what was shown as can be mention
- R 11 to R 14 may be independently present to form a ring, but are bonded to each other through a single bond, a substituted or unsubstituted methylene group, an oxygen atom or a sulfur atom to form a ring. May be.
- R 15 to R 18 may be independently present and do not form a ring, but may be 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. Further, for example, as in compounds 3-1 to 3-6 in FIG.
- a ring may be formed by bonding via a substituted or unsubstituted methylene group, oxygen atom, sulfur atom or monoarylamino group.
- R 15 to R 18 is eliminated, and another group of R 15 to R 18 is substituted with a substituted or unsubstituted methylene group, oxygen atom, sulfur atom or mono
- a ring may be formed by bonding via an arylamino group.
- each other R 11 ⁇ R 18 is an aromatic having di-substituted amino group A mode in which a ring is bonded to each other via a single bond, a substituted or unsubstituted methylene group, an oxygen atom or a sulfur atom through an aromatic hydrocarbon group, an aromatic heterocyclic group or a condensed polycyclic aromatic group. included.
- R 11 to R 14 a part of R 11 to R 14 is eliminated, and another group (disubstituted amino group) of R 11 to R 14 is an aromatic hydrocarbon having a disubstituted amino group at a vacancy generated by the elimination. Also included is a mode in which a ring is bonded to each other via a substituted or unsubstituted methylene group, oxygen atom, sulfur atom or monoarylamino group via a group, aromatic heterocyclic group or condensed polycyclic aromatic group It is.
- R 15 to R 18 Furthermore, a part of R 15 to R 18 is eliminated, and another group (disubstituted amino group) of R 15 to R 18 is substituted with an aromatic carbon atom possessed by the disubstituted amino group at the vacancy generated by the elimination.
- Examples of the monoarylamino group that plays a role as a linking group in ring formation include the same monoarylamino groups as the linking group in the general formula (2). Moreover, this monoarylamino group may be unsubstituted or may have a substituent. As the substituent, the aromatic hydrocarbon group, the aromatic heterocyclic group or the condensed polycyclic aromatic group represented by Ar 1 to Ar 4 in the general formula (1) may be shown. The same thing can be given. The aspect which a substituent can take is also the same.
- two adjacent R 15 to R 18 are alkenyl groups having 2 to 6 carbon atoms, aromatic hydrocarbon groups
- An embodiment in which a condensed ring is formed with a benzene ring is preferred.
- the alkenyl group having 2 to 6 carbon atoms, the aromatic hydrocarbon group, the aromatic heterocyclic group or the condensed polycyclic aromatic group is preferably a vinyl group or a phenyl group, that is, R 15 to R 18 are
- R 15 to R 18 are An embodiment in which a naphthalene ring, a phenanthrene ring or a triphenylene ring is formed together with the bonded benzene ring is preferable.
- any one of R 11 to R 14 is an aromatic hydrocarbon group, an aromatic heterocyclic group or a condensed polycyclic aromatic group, and a benzene ring to which R 11 to R 14 are bonded to a substituted or
- a ring is bonded to each other via a linking group such as an unsubstituted methylene group, oxygen atom, sulfur atom or monoarylamino group is preferred.
- the aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group is preferably a phenyl group, an indenyl group, an indolyl group, a benzofuranyl group or a benzothienyl group.
- the benzene ring to which R 11 to R 14 and R 11 to R 14 are bonded includes a fluorene ring, a carbazole ring, a dibenzofuran ring, a dibenzothiophene ring, an indenoindole ring, an indenobenzofuran ring, an inde It is preferable to form a nobenzothiophene ring, a benzofuroindole ring, a benzothienoindole ring, or an indoloindole ring.
- X represents a substituted or unsubstituted methylene group, oxygen atom, sulfur atom or monoarylamino group, and A 2 , Ar 6 and R 11 to R 18 are as shown in the general formula (3). Represents the meaning of
- R 11 to R 14 are vinyl groups and the two adjacent vinyl groups are bonded to each other via a single bond to form a condensed ring, that is, R 11 to R 14 are
- R 11 to R 14 are
- a naphthalene ring or a phenanthrene ring is formed with a bonded benzene ring is also preferable.
- any one of R 15 to R 18 is an aromatic hydrocarbon group, an aromatic heterocyclic group or a condensed polycyclic aromatic group, and any one of R 15 to R 18 is a fluorenyl group, a carbazolyl group. More preferably a group selected from a dibenzofuranyl group or a dibenzothienyl group, wherein R 16 is a fluorenyl group, a carbazolyl group, a dibenzofuranyl group or a dibenzothienyl group, and R 15 , R 17 and R 18 are Particularly preferred is a hydrogen atom.
- FIGS. 20 to 22 Specific examples of preferable compounds among the indenoindole derivatives of the general formula (2) are shown in FIGS. 20 to 22.
- the indenoindole derivatives of the general formula (2) are limited to these exemplified compounds. It is not a thing.
- the compounds corresponding to the formula (2a) are (2-1) to (2-4) and (2-9) to (2-10).
- the compounds corresponding to the formula (2b) are (2-5) to (2-6) and (2-11) to (2-12).
- the compounds corresponding to the formula (2c) are (2-7) to (2-8).
- the compound corresponding to the formula (2d) is (2-14).
- the compound corresponding to the formula (2e) is (2-15).
- compounds corresponding to the formula (3a-1) are (3-1) to (3-6), (3-8) to (3-10), (3- 12) and (3-15).
- the compound corresponding to the formula (3a-2) is (3-14).
- the compound corresponding to the formula (3a-3) is (3-7).
- the compound corresponding to the formula (3a-4) is (3-11).
- the compound corresponding to the formula (3b-1) is (3-13).
- the indenoindole derivative of the general formula (2) and the carbazole derivative of the general formula (3) are superior in luminous efficiency as compared with conventional materials, and emit light containing a host material of the light emitting layer, particularly a phosphorescent light emitting material. Preferred compounds as the layer host material.
- the light emitting layer in the organic EL device of the present invention has Alq 3 within the range where the excellent properties of the above-described indenoindole derivative of the general formula (2) or the carbazole derivative of the general formula (3) are not impaired.
- Various metal complexes such as metal complexes of quinolinol derivatives including: anthracene derivatives; bisstyrylbenzene derivatives; pyrene derivatives; oxazole derivatives; polyparaphenylene vinylene derivatives;
- the light emitting layer may be composed of a host material and a dopant material.
- the host material include the indenoindole derivative of the general formula (2); the carbazole derivative of the general formula (3); the luminescent material; the thiazole derivative; the benzimidazole derivative; the polydialkylfluorene derivative; The indenoindole derivative of the general formula (2) or the carbazole derivative of the general formula (3) is preferable.
- quinacridone As the dopant material, quinacridone, coumarin, rubrene, perylene, pyrene and derivatives thereof; benzopyran derivatives; indenophenanthrene derivatives; rhodamine derivatives; aminostyryl derivatives;
- a phosphorescent light-emitting material is preferably used as the light-emitting material.
- a phosphorescent light emitting material a phosphorescent material of a metal complex containing iridium, platinum or the like can be used.
- a green phosphorescent material such as Ir (ppy) 3
- a blue phosphorescent material such as FIrpic or FIr6 A phosphor
- a red phosphorescent emitter such as Btp 2 Ir (acac) is used.
- the indenoindole derivative of the general formula (2) or the carbazole derivative of the general formula (3) can be used.
- the following hole injection / transport host materials can also be used.
- Carbazole derivatives such as 4,4′-di (N-carbazolyl) biphenyl (CBP), TCTA, mCP;
- the following electron transporting host material can also be used.
- the doping of the phosphorescent light-emitting material into the host material is preferably performed by co-evaporation in the range of 1 to 30 weight percent with respect to the entire light-emitting layer in order to avoid concentration quenching.
- a material that emits delayed fluorescence such as CDCB derivatives such as PIC-TRZ, CC2TA, PXZ-TRZ, and 4CzIPN, can be used as the light-emitting material.
- a red light-emitting material is preferably used as the light-emitting material used in combination with the indenoindole derivative represented by the general formula (2) or the carbazole derivative represented by the general formula (3).
- the electron transport layer 7 is provided on the light emitting layer 6 described above.
- the electron transport layer 7 may be formed of a known electron transport material, for example, various metal complexes such as metal complexes of quinolinol derivatives including Alq 3 and BAlq; triazole derivatives; triazine derivatives; oxadiazole derivatives; pyridine Anthracene derivatives; benzimidazole derivatives; thiadiazole derivatives; benzotriazole derivatives; carbodiimide derivatives; quinoxaline derivatives; pyridoindole derivatives; phenanthroline derivatives;
- a pyrimidine derivative represented by the following general formula (4) (sometimes abbreviated as “pyrimidine derivative of general formula (4)” in this specification) is used as an electron transporting material. It is preferable to form an electron transport layer, and it is more preferable to form an electron transport layer using a pyrimidine derivative represented by the following general formula (4a) or (4b) as an electron transport material.
- a pyrimidine derivative represented by the following general formula (4a) or (4b) as an electron transport material.
- Such pyrimidine derivatives have excellent electron injection and transport capabilities, and also have excellent thin film stability and durability. Therefore, in an electron transport layer containing such a pyrimidine derivative, electrons from the electron transport layer to the light-emitting layer are used. This is because the transportation efficiency is improved.
- Ar 7 represents an aromatic hydrocarbon group, an aromatic heterocyclic group or a condensed polycyclic aromatic group
- Ar 8 and Ar 9 are A hydrogen atom, an aromatic hydrocarbon group, an aromatic heterocyclic group or a condensed polycyclic aromatic group is represented.
- Ar 8 and Ar 9 are not hydrogen atoms at the same time.
- aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group represented by Ar 7 to Ar 9 include a phenyl group, a biphenylyl group, a terphenylyl group, a tetrakisphenyl group, a styryl group, Naphthyl, anthracenyl, acenaphthenyl, phenanthrenyl, fluorenyl, indenyl, pyrenyl, perylenyl, fluoranthenyl, triphenylenyl, spirobifluorenyl, furyl, thienyl, benzofuranyl, benzothienyl Group, dibenzofuranyl group, dibenzothienyl group and the like.
- the aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group represented by Ar 7 to Ar 9 may be unsubstituted or may have a substituent.
- substituents include the following groups in addition to a deuterium atom, a cyano group, and a nitro group.
- a halogen atom such as a fluorine atom, a chlorine atom, a bromine atom, an iodine atom
- Alkyl groups having 1 to 6 carbon atoms such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl An n-hexyl group
- An alkenyl group such as a vinyl group, an allyl group
- An aryloxy group such as a phenyloxy group, a tolyloxy group
- Arylalkyloxy groups such as benzyloxy group, phenethyloxy group
- Aromatic hydrocarbon group or condensed polycyclic aromatic group such as
- substituents may be further substituted with the above-exemplified substituents. These substituents may be present independently and do not form a ring, but are bonded to each other through a single bond, a substituted or unsubstituted methylene group, an oxygen atom or a sulfur atom to form a ring. These substituents and Ar 7 , Ar 8 or Ar 9 to which the substituent is bonded may be bonded to each other via an oxygen atom or a sulfur atom to form a ring.
- Ar 7 includes: phenyl group; biphenylyl group; naphthyl group; anthracenyl group; acenaphthenyl group; phenanthrenyl group; fluorenyl group; indenyl group; pyrenyl group; perylenyl group; fluoranthenyl group; triphenylenyl group; Preferred are oxygen-containing aromatic heterocyclic groups such as furyl group, benzofuranyl group, dibenzofuranyl group; or sulfur-containing aromatic heterocyclic groups such as thienyl group, benzothienyl group, dibenzothienyl group; phenyl group, biphenylyl group, A naphthyl group, a phenanthrenyl group, a fluorenyl group, a pyrenyl group, a fluoranthenyl group, a triphenylenyl group, a spirobifluorenyl group, a dibenzofuranyl
- the phenyl group preferably has a substituted or unsubstituted condensed polycyclic aromatic group or a phenyl group as a substituent, and includes a naphthyl group, a phenanthrenyl group, a pyrenyl group, a fluoran group. More preferably, it has a substituent selected from a tenenyl group, a triphenylenyl group, a spirobifluorenyl group or a phenyl group. It is also preferred that the substituent of the phenyl group and the phenyl group are bonded to each other via an oxygen atom or a sulfur atom to form a ring.
- Ar 8 includes a phenyl group having a substituent; a substituted or unsubstituted spirobifluorenyl group; an oxygen-containing aromatic heterocyclic group such as a furyl group, a benzofuranyl group, a dibenzofuranyl group; or a sulfur-containing aromatic complex.
- a cyclic group such as a thienyl group, a benzothienyl group, or a dibenzothienyl group is preferable.
- the substituent of the phenyl group includes an aromatic hydrocarbon group such as a phenyl group, a biphenylyl group, and a terphenyl group; a condensed polycyclic aromatic group such as a naphthyl group, an acenaphthenyl group, a phenanthrenyl group, a fluorenyl group, and an indenyl group.
- Ar 9 includes a hydrogen atom; a substituted phenyl group; a substituted or unsubstituted spirobifluorenyl group; an oxygen-containing aromatic heterocyclic group such as a furyl group, a benzofuranyl group, a dibenzofuranyl group; or a sulfur-containing group.
- Aromatic heterocyclic groups such as thienyl, benzothienyl, dibenzothienyl are preferred.
- the substituent of the phenyl group includes an aromatic hydrocarbon group such as a phenyl group, a biphenylyl group, and a terphenyl group; a condensed polycyclic aromatic group such as a naphthyl group, an acenaphthenyl group, a phenanthrenyl group, a fluorenyl group, and an indenyl group.
- one of Ar 8 and Ar 9 is a hydrogen atom.
- B represents a monovalent group represented by the following structural formula (5), and from the viewpoint of thin film stability, preferably, the following structural formula The monovalent group represented by (5a) is represented.
- the Ar 10 bonding position on the benzene ring is the meta position with respect to the bonding position with the pyrimidine ring represented by the general formula (4).
- Ar 10 represents an aromatic heterocyclic group.
- Specific examples of the aromatic heterocyclic group represented by Ar 10 include triazinyl group, pyridyl group, pyrimidinyl group, furyl group, pyrrolyl group, thienyl group, quinolyl group, isoquinolyl group, benzofuranyl group, benzothienyl group, indolyl group.
- the aromatic heterocyclic group represented by Ar 10 may be unsubstituted or may have a substituent.
- an aromatic hydrocarbon group represented by Ar 7 to Ar 9 in the general formula (4), an aromatic heterocyclic group or a condensed polycyclic aromatic group may be shown. The same thing can be given. The aspect which a substituent can take is also the same.
- Ar 10 includes a nitrogen-containing heterocyclic group such as a triazinyl group, pyridyl group, pyrimidinyl group, pyrrolyl group, quinolyl group, isoquinolyl group, indolyl group, carbazolyl group, benzoxazolyl group, benzothiazolyl group, quinoxalinyl group, benzoimidazolyl group , A pyrazolyl group, an azafluorenyl group, a diazafluorenyl group, a naphthyridinyl group, a phenanthrolinyl group, an acridinyl group, a carbolinyl group, an azaspirobifluorenyl group or a diazaspirobifluorenyl group, and a triazinyl group , Pyridyl group, pyrimidinyl group, quinolyl group, isoquinolyl group, indolyl group, quinoxalinyl
- R 19 to R 22 are each a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, or an alkyl having 1 to 6 carbon atoms.
- the alkyl group having 1 to 6 carbon atoms may be linear or branched.
- R 19 to R 22 and Ar 10 may be present independently and do not form a ring, but 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.
- alkyl group having 1 to 6 carbon atoms represented by R 19 to R 22 include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, and 2-methylpropyl.
- the alkyl group having 1 to 6 carbon atoms represented by R 19 to R 22 may be unsubstituted or may have a substituent.
- the substituent include an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 5 to 10 carbon atoms, or a group having 2 to 6 carbon atoms represented by R 1 to R 8 in the general formula (2).
- lifted The aspect which a substituent can take is also the same.
- aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group represented by R 19 to R 22 include a phenyl group, a biphenylyl group, a terphenylyl group, a tetrakisphenyl group, a styryl group, Naphtyl group, Anthracenyl group, Acenaphthenyl group, Phenanthrenyl group, Fluorenyl group, Indenyl group, Pyrenyl group, Perylenyl group, Fluoranthenyl group, Triphenylenyl group, Spirobifluorenyl group, Triazinyl group, Pyridyl group, Pyrimidinyl group, Furyl group , Pyrrolyl group, thienyl group, quinolyl group, isoquinolyl group, benzofuranyl group, benzothienyl group, indolyl group, carbazolyl group, benzoxazolyl
- the aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group represented by R 19 to R 22 may be unsubstituted or may have a substituent.
- an aromatic hydrocarbon group represented by Ar 7 to Ar 9 in the general formula (4), an aromatic heterocyclic group or a condensed polycyclic aromatic group may be shown. The same thing can be given. The aspect which a substituent can take is also the same.
- compounds corresponding to the formula (4a) are (4-1) to (4-49), (4-66) to (4-99), and (4-103). To (4-105) and (4-107) to (4-126).
- Compounds corresponding to formula (4b) are (4-50) to (4-65).
- those in which the group B is a monovalent group represented by the structural formula (5a) are (4-1) to (4-66), (4-68), (4-71) to (4-72) , (4-105) to (4-107) and (4-112) to (4-122).
- the above-described electron transport material may be used alone for film formation, or may be mixed with other materials for film formation.
- the organic EL device of the present invention may have an electron injection layer 8 between the electron transport layer 7 and the cathode 9.
- the electron injection layer 8 may contain alkali metal salts such as lithium fluoride and cesium fluoride; alkaline earth metal salts such as magnesium fluoride; metal oxides such as aluminum oxide; This can be omitted in the preferred choice of transport layer and cathode.
- an electrode material having a low work function such as aluminum, or an alloy having a lower work function such as a magnesium silver alloy, a magnesium indium alloy, or an aluminum magnesium alloy is used as the electrode material. It is done.
- the organic EL device of the present invention may have other layers as necessary.
- an electron blocking layer can be provided between the hole transport layer 5 and the light emitting layer 6, and a hole between the light emitting layer 6 and the electron transport layer 7.
- a blocking layer can also be provided.
- Electron blocking layer A known compound having an electron blocking action can be used for the electron blocking layer.
- Carbazole derivatives such as 4,4 ′, 4 ′′ -tri (N-carbazolyl) triphenylamine (TCTA); 9,9-bis [4- (carbazol-9-yl) phenyl] fluorene; 1,3-bis (carbazol-9-yl) benzene (mCP); 2,2-bis (4-carbazol-9-ylphenyl) adamantane (Ad-Cz); Compounds having a triphenylsilyl group and a triarylamine structure, such as 9- [4- (carbazol-9-yl) phenyl] -9- [4- (triphenylsilyl) phenyl] -9H-fluorene;
- the arylamine compound represented by the general formula (1) can be suitably used for the electron blocking layer. This is because the electron blocking performance is high.
- the composition of the electron blocking layer and the composition of the hole transport layer must be different. These materials may be used alone for film formation, or may be mixed with other materials for film formation.
- Hole blocking layer in addition to metal complexes of phenanthroline derivatives such as bathocuproine (BCP), quinolinol derivatives such as aluminum (III) bis (2-methyl-8-quinolinato) -4-phenylphenolate (BAlq), Various kinds of rare earth complexes, triazole derivatives, triazine derivatives, oxadiazole derivatives, and other compounds having a hole blocking action can be used. These materials may be used alone for film formation, but may be mixed with other materials for film formation. These materials may also serve as the material for the electron transport layer.
- phenanthroline derivatives such as bathocuproine (BCP)
- quinolinol derivatives such as aluminum (III) bis (2-methyl-8-quinolinato) -4-phenylphenolate (BAlq)
- Various kinds of rare earth complexes, triazole derivatives, triazine derivatives, oxadiazole derivatives, and other compounds having a hole blocking action can be used. These materials may
- each layer constituting the organic EL element may have a single layer structure or a multi-layer structure.
- the hole transport layer 5 in order to exhibit the excellent characteristics of the arylamine compound of the general formula (1) described above, the hole transport layer 5 is replaced with the first hole transport layer 5a as shown in FIG. And a second hole transport layer 5b.
- the hole transport layer 5 having the two-layer structure will be described.
- the arylamine compound represented by the general formula (1) is used for forming the hole transport layer 5.
- a layer structure is preferred. That is, as shown in FIG. 1, the hole transport layer 5 includes a first hole transport layer 5a located on the anode 2 side and a second hole transport located on the light emitting layer 6 side. A two-layer structure divided into the layer 5b is preferable.
- the second hole transport layer 5b preferably contains the arylamine compound of the general formula (1). This is because the electron blocking performance is high. In this case, the second hole transport layer 5b may be used in combination with the above-described hole transport material.
- the composition of the first hole transport layer 5a is different from the composition of the second hole transport layer 5b.
- the first hole transport layer 5a is a triarylamine compound having 2 to 6 triarylamine structures in the molecule in addition to the above-described hole transporting material, A triarylamine compound having a structure linked by a single bond or a divalent group containing no hetero atom can be used. This is because the arylamine skeleton exhibits excellent hole transport properties.
- triarylamine compound having 2 to 6 triarylamine structures described above examples include a triarylamine compound having two triarylamine structures represented by the following general formula (6). (Sometimes abbreviated as “triarylamine compound of (6)”) or a triarylamine compound having four triarylamine structures represented by the following general formula (7) (herein “general formula ( 7) is sometimes abbreviated as “triarylamine compound”.
- a triarylamine compound of the general formula (6) A triarylamine compound of the general formula (6);
- r 23 to r 28 are each an integer indicating the number of groups R 23 to R 28 bonded to the benzene ring.
- r 23 , r 24 , r 27 and r 28 each represents an integer of 0 to 5
- r 25 and r 26 each represents an integer of 0 to 4.
- r 23 to r 28 an integer of 0 to 3 is preferable, and an integer of 0 to 2 is more preferable.
- R 23 to R 28 are not present on the benzene ring, that is, the benzene ring is not substituted with a group represented by R 23 to R 28. .
- a plurality of R 23 to R 28 are present in the same benzene ring.
- a plurality of substituents may be present independently of each other to form a ring, but may be mutually connected via a single bond, a substituted or unsubstituted methylene group, an oxygen atom or a sulfur atom. They may combine to form a ring.
- substituents may be bonded to form a naphthalene ring.
- R 23 to R 28 are a deuterium atom, a fluorine atom, a chlorine atom, a cyano group, a nitro group, an alkyl group having 1 to 6 carbon atoms, and a cycloalkyl group having 5 to 10 carbon atoms.
- the alkyl group having 1 to 6 carbon atoms, the alkenyl group having 2 to 6 carbon atoms, and the alkyloxy group having 1 to 6 carbon atoms may be linear or branched.
- alkyl group having 1 to 6 carbon atoms, the cycloalkyl group having 5 to 10 carbon atoms or the alkenyl group having 2 to 6 carbon atoms represented by R 23 to R 28 include a 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, cyclopentyl group, cyclohexyl group, 1-adamantyl group, Examples thereof include 2-adamantyl group, vinyl group, allyl group, isopropenyl group, 2-butenyl group and the like.
- the alkyl group having 1 to 6 carbon atoms, the cycloalkyl group having 5 to 10 carbon atoms, or the alkenyl group having 2 to 6 carbon atoms represented by R 23 to R 28 may be unsubstituted but has a substituent. May be.
- substituents include the following groups in addition to a deuterium atom, a cyano group, and a nitro group.
- a halogen atom such as a fluorine atom, a chlorine atom, a bromine atom, an iodine atom;
- An alkenyl group such as a vinyl group, an allyl group;
- An aryloxy group such as a phenyloxy group, a tolyloxy group;
- Arylalkyloxy groups such as benzyloxy group, phenethyloxy group;
- Aromatic hydrocarbon group or condensed polycyclic aromatic group such as phenyl group, biphenylyl group, terphenylyl group, naphthyl group, anthracenyl group, phenanthrenyl group, fluorenyl group, indenyl group, pyrenyl group, perylenyl group, fluoranthenyl group A triphenyleny
- substituents may be further substituted with the above-exemplified substituents. These substituents may be present independently and do not form a ring, but are bonded to each other via a single bond, a substituted or unsubstituted methylene group, an oxygen atom or a sulfur atom. May be formed.
- alkyloxy group having 1 to 6 carbon atoms or the cycloalkyloxy group having 5 to 10 carbon atoms represented by R 23 to R 28 include a methyloxy group, an ethyloxy group, and an n-propyloxy group. , Isopropyloxy group, n-butyloxy group, tert-butyloxy group, n-pentyloxy group, n-hexyloxy group, cyclopentyloxy group, cyclohexyloxy group, cycloheptyloxy group, cyclooctyloxy group, 1-adamantyloxy group , 2-adamantyloxy group and the like.
- the alkyloxy group having 1 to 6 carbon atoms or the cycloalkyloxy group having 5 to 10 carbon atoms represented by R 23 to R 28 may be unsubstituted or may have a substituent.
- the substituent include an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 5 to 10 carbon atoms, and a C 2 to 6 carbon atom represented by R 23 to R 28 in the general formula (6).
- the thing similar to what was shown as a substituent which an alkenyl group may have can be mention
- Examples of the aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group represented by R 23 to R 28 include aromatic carbon groups represented by Ar 1 to Ar 4 in the general formula (1).
- the thing similar to what was shown regarding the hydrogen group, the aromatic heterocyclic group, or the condensed polycyclic aromatic group can be mention
- the aromatic hydrocarbon group represented by Ar 1 to Ar 4 in the general formula (1), the aromatic heterocyclic group, or the condensed polycyclic aromatic group may have a substituent.
- the same thing can be given.
- the aspect which a substituent can take is also the same.
- aryloxy group represented by R 23 to R 28 include a phenyloxy group, a biphenylyloxy group, a terphenylyloxy group, a naphthyloxy group, an anthracenyloxy group, and a phenanthrenyloxy group. Fluorenyloxy group, indenyloxy group, pyrenyloxy group, perylenyloxy group and the like.
- the aryloxy group represented by R 23 to R 28 may be unsubstituted or may have a substituent.
- the aromatic hydrocarbon group represented by Ar 1 to Ar 4 in the general formula (1), the aromatic heterocyclic group, or the condensed polycyclic aromatic group may have a substituent. The same thing can be given. The aspect which a substituent can take is also the same.
- R 23 to R 28 are preferably a deuterium atom, an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aromatic hydrocarbon group or a condensed polycyclic aromatic group, and a deuterium atom More preferred are a phenyl group, a biphenylyl group, a naphthyl group, and a vinyl group. It is also preferred that R 23 to R 28 are bonded to each other through a single bond to form a condensed aromatic ring. In particular, a deuterium atom, a phenyl group, and a biphenylyl group are preferable.
- L 1 is a bridging group that bonds two triarylamine structures, and represents a divalent group or a single bond represented by the following structural formulas (B) to (G).
- n1 represents an integer of 1 to 4.
- L 1 is preferably a divalent group or a single bond represented by the structural formula (B), (D) or (G), and a divalent group or a single bond represented by the structural formula (D) or (G). Is more preferable.
- N1 in the structural formula (B) is preferably 1 or 2.
- a triarylamine compound of the general formula (7) A triarylamine compound of the general formula (7);
- r 29 to r 40 are each an integer indicating the number of groups R 29 to R 40 bonded to the benzene ring.
- r 29 , r 30 , r 33 , r 36 , r 39 , r 40 represent an integer of 0 to 5
- r 31 , r 32 , r 34 , r 35 , r 37 , r 38 represent an integer of 0 to 4 To express.
- r 29 to r 40 an integer of 0 to 3 is preferable, and an integer of 0 to 2 is more preferable.
- R 29 to R 40 are not present on the benzene ring, that is, the benzene ring is not substituted with a group represented by R 29 to R 40 .
- r 29 , r 30 , r 33 , r 36 , r 39 , r 40 are integers of 2 to 5, or r 31 , r 32 , r 34 , r 35 , r 37 , r 38 are 2 to 4
- a plurality of R 29 to R 40 are bonded to the same benzene ring.
- a plurality of substituents may be present independently of each other to form a ring, but may be mutually connected via a single bond, a substituted or unsubstituted methylene group, an oxygen atom or a sulfur atom. They may combine to form a ring.
- a plurality of substituents may be bonded to form a naphthalene ring.
- R 29 to R 40 are a deuterium atom, a fluorine atom, a chlorine atom, a cyano group, a nitro group, an alkyl group having 1 to 6 carbon atoms, and a cycloalkyl group having 5 to 10 carbon atoms.
- the alkyl group having 1 to 6 carbon atoms, the alkenyl group having 2 to 6 carbon atoms, and the alkyloxy group having 1 to 6 carbon atoms may be linear or branched.
- Examples of the alkyl group having 1 to 6 carbon atoms, the cycloalkyl group having 5 to 10 carbon atoms, or the alkenyl group having 2 to 6 carbon atoms represented by R 29 to R 40 include those in the general formula (6). Examples of the alkyl group having 1 to 6 carbon atoms, the cycloalkyl group having 5 to 10 carbon atoms, or the alkenyl group having 2 to 6 carbon atoms represented by R 23 to R 28 are the same. Can do. These groups may be unsubstituted or may have a substituent.
- substituents examples include an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 5 to 10 carbon atoms, and a C 2 to 6 carbon atom represented by R 23 to R 28 in the general formula (6).
- lifted The aspect which a substituent can take is also the same.
- the alkyloxy group having 1 to 6 carbon atoms or the cycloalkyloxy group having 5 to 10 carbon atoms represented by R 29 to R 40 is represented by R 23 to R 28 in the general formula (6).
- Examples of the alkyloxy group having 1 to 6 carbon atoms or the cycloalkyloxy group having 5 to 10 carbon atoms are the same as those described above. These groups may be unsubstituted or may have a substituent. Examples of the substituent include an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 5 to 10 carbon atoms, and a C 2 to 6 carbon atom represented by R 23 to R 28 in the general formula (6).
- the thing similar to what was shown regarding the substituent in an alkenyl group can be mention
- the aspect which these groups can take is also the same.
- Examples of the aromatic hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group represented by R 29 to R 40 include aromatic carbon groups represented by Ar 1 to Ar 4 in the general formula (1).
- the thing similar to what was shown regarding the hydrogen group, the aromatic heterocyclic group, or the condensed polycyclic aromatic group can be mention
- the aromatic hydrocarbon group represented by Ar 1 to Ar 4 in the general formula (1), the aromatic heterocyclic group, or the condensed polycyclic aromatic group may have a substituent.
- the same thing can be given.
- the aspect which a substituent can take is also the same.
- Examples of the aryloxy group represented by R 29 to R 40 include the same aryloxy groups represented by R 23 to R 28 in the general formula (6).
- the aryloxy group represented by R 29 to R 40 may be unsubstituted or may have a substituent.
- the aromatic hydrocarbon group represented by Ar 1 to Ar 4 in the general formula (1), the aromatic heterocyclic group, or the condensed polycyclic aromatic group may have a substituent. The same thing can be given. The aspect which a substituent can take is also the same.
- R 29 to R 40 are preferably a deuterium atom, an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aromatic hydrocarbon group or a condensed polycyclic aromatic group, and a deuterium atom More preferred are a phenyl group, a biphenylyl group, a naphthyl group, and a vinyl group.
- R 29 to R 40 may be present independently and do not form a ring, but are preferably bonded to each other via a single bond to form a condensed aromatic ring.
- a deuterium atom, a phenyl group, and a biphenylyl group are preferable.
- L 2 ⁇ L 4 is a bridge ⁇ joining two triarylamine skeleton, respectively, by the following structural formula (B ') or the structural formula (C) ⁇ (G) Represents the divalent group or single bond shown.
- the divalent group represented by the following structural formula (B ′) may be unsubstituted, or may be substituted with deuterium as in the example compound 7-17 of FIG.
- n2 represents an integer of 1 to 3.
- L 2 to L 4 are preferably a divalent group or a single bond represented by the structural formula (B ′) or (D), more preferably a divalent group or a single bond represented by the structural formula (B ′).
- n2 is preferably 1 or 2, and more preferably 1.
- FIGS. 55 to 59 Specific examples of preferable compounds among the triarylamine compounds of the general formula (6) are shown in FIGS. 55 to 59, but the triarylamine compounds of the general formula (6) are limited to these exemplified compounds. It is not a thing. Further, regarding the triarylamine compound having two triarylamine structures among the triarylamine compounds having 2 to 6 triarylamine structures described above, suitable compounds other than the triarylamine compounds of the general formula (6) are preferred. A specific example is shown in FIG. However, the triarylamine compound having two triarylamine structures is not limited to these exemplified compounds. Note that D in the structural formula represents deuterium.
- FIGS. 61 to 64 Specific examples of preferred compounds among the arylamine compounds of the general formula (7) are shown in FIGS. 61 to 64.
- the triarylamine compounds of the general formula (7) are limited to these exemplified compounds. It is not something. Note that D in the structural formula represents deuterium.
- Triarylamine compounds having 2 to 6 triarylamine structures such as the triarylamine compound of the general formula (6) and the triarylamine compound of the general formula (7) can be synthesized according to a known method ( (See Patent Document 1, 8-9).
- the mixture was allowed to cool, methanol was added, and the precipitate was collected by filtration.
- the precipitate was heated and dissolved in chlorobenzene and subjected to adsorption purification using silica gel. Subsequently, adsorption purification using activated clay was performed. Then, crystallization was performed using a mixed solvent of chlorobenzene / methanol. Thereafter, reflux washing using methanol was performed.
- Compound of Synthesis Example 9 (Compound 1-39) 106 ° C.
- Compound of Synthesis Example 10 (Compound 1-41) 127 ° C.
- Compound of Synthesis Example 11 (Compound 1-42) 111 ° C.
- Compound of Synthesis Example 12 (Compound 1-45) 122 ° C
- Compound of Synthesis Example 13 (Compound 1-47) 116 ° C.
- Compound of Synthesis Example 14 (Compound 1-49) 117 ° C Compound of Synthesis Example 15 (Compound 1-88) 163 ° C.
- the arylamine compound represented by the general formula (1) has a glass transition point of 100 ° C. or higher, indicating that the thin film state is stable.
- a deposited film having a film thickness of 100 nm was prepared on the ITO substrate, and the work function was measured by an ionization potential measuring apparatus (PYS-202, manufactured by Sumitomo Heavy Industries, Ltd.). Was measured.
- the arylamine compound represented by the general formula (1) exhibits a suitable energy level as compared with a work function of 5.4 eV possessed by a general hole transport material such as NPD or TPD. It had a hole transport capability.
- a hole injection layer 3, a first hole transport layer 5a, a second hole transport layer 5b, and a light emitting layer are formed on a glass substrate 1 on which an ITO electrode is previously formed as a transparent anode 2.
- an ITO electrode is previously formed as a transparent anode 2.
- the electron carrying layer 7, the electron injection layer 8, and the cathode (aluminum electrode) 9 were vapor-deposited in order, and the organic EL element was produced.
- the glass substrate 1 on which ITO having a thickness of 150 nm was formed was subjected to ultrasonic cleaning in isopropyl alcohol for 20 minutes, and then dried on a hot plate heated to 200 ° C. for 10 minutes. Thereafter, UV ozone treatment was performed for 15 minutes. Next, this ITO-attached glass substrate was mounted in a vacuum vapor deposition machine, and the pressure was reduced to 0.001 Pa or less. Subsequently, a hole injection layer 3 was formed. Specifically, HIM-1 having the following structural formula was deposited so as to cover the transparent anode 2 to form a hole injection layer 3 having a thickness of 5 nm. Subsequently, a first hole transport layer 5a was formed.
- a triarylamine compound 6-1 represented by the following structural formula was deposited on the hole injection layer 3 to form a first hole transport layer 5a having a thickness of 60 nm. Subsequently, a second hole transport layer 5b was formed. Specifically, the compound 1-5 of Synthesis Example 1 was deposited on the first hole transport layer 5a to form the second hole transport layer 5b having a thickness of 5 nm. Subsequently, the light emitting layer 6 was formed.
- Binary vapor deposition was performed at a vapor deposition rate to form an electron transport layer 7 having a thickness of 30 nm.
- an electron injection layer 8 was formed.
- lithium fluoride was deposited on the electron transport layer 7 to form an electron injection layer 8 having a thickness of 1 nm.
- aluminum was deposited to 100 nm to form the cathode 9.
- the layer structure is shown in Table 1, and the measurement results are shown in Table 2.
- Example 2 An organic EL device was produced under the same conditions as in Example 1, except that Compound 1-34 of Synthesis Example 6 was used instead of Compound 1-5 of Synthesis Example 1 as the material for the second hole transport layer 5b. .
- the layer structure is shown in Table 1, and the measurement results are shown in Table 2.
- Example 3 An organic EL device was produced under the same conditions as in Example 1, except that instead of the pyrimidine derivative 4-123, a pyrimidine derivative 4-125 having the following structural formula was used as the material for the electron transport layer 7. About the produced organic EL element, the light emission characteristic when a DC voltage was applied at normal temperature in air
- Example 4 An organic EL device was produced under the same conditions as in Example 3, except that Compound 1-34 of Synthesis Example 6 was used instead of Compound 1-5 of Synthesis Example 1 as the material for the second hole transport layer 5b. .
- the layer structure is shown in Table 1, and the measurement results are shown in Table 2.
- Example 5 An organic EL device was produced under the same conditions as in Example 1, except that Compound 3-14 of Synthesis Example 45 was used instead of Compound 2-4 of Synthesis Example 23 as the material of the light-emitting layer 6. About the produced organic EL element, the light emission characteristic when a DC voltage was applied at normal temperature in air
- Example 6 An organic EL device was produced under the same conditions as in Example 5, except that Compound 1-34 of Synthesis Example 6 was used instead of Compound 1-5 of Synthesis Example 1 as the material for the second hole transport layer 5b. .
- the layer structure is shown in Table 1, and the measurement results are shown in Table 2.
- Example 7 An organic EL device was produced under the same conditions as in Example 5 except that the pyrimidine derivative 4-125 was used instead of the pyrimidine derivative 4-123 as the material for the electron transport layer 7. About the produced organic EL element, the light emission characteristic when a DC voltage was applied at normal temperature in air
- Example 8 An organic EL device was produced under the same conditions as in Example 7, except that Compound 1-34 of Synthesis Example 6 was used instead of Compound 1-5 of Synthesis Example 1 as the material for the second hole transport layer 5b. .
- the layer structure is shown in Table 1, and the measurement results are shown in Table 2.
- Example 9 An organic EL device was produced under the same conditions as in Example 1, except that the carbazole derivative 3-16 having the following structural formula was used as the material of the light-emitting layer 6 instead of the compound 2-4 of Synthesis Example 23. About the produced organic EL element, the light emission characteristic when a DC voltage was applied at normal temperature in air
- Example 10 An organic EL device was produced under the same conditions as in Example 9, except that Compound 1-34 of Synthesis Example 6 was used instead of Compound 1-5 of Synthesis Example 1 as the material for the second hole transport layer 5b. .
- the layer structure is shown in Table 1, and the measurement results are shown in Table 2.
- Example 11 An organic EL device was produced under the same conditions as in Example 9, except that pyrimidine derivative 4-125 was used instead of pyrimidine derivative 4-123 as the material for electron transport layer 7. About the produced organic EL element, the light emission characteristic when a DC voltage was applied at normal temperature in air
- Example 12 An organic EL device was produced under the same conditions as in Example 11 except that Compound 1-34 of Synthesis Example 6 was used instead of Compound 1-5 of Synthesis Example 1 as the material for the second hole transport layer 5b. .
- the layer structure is shown in Table 1, and the measurement results are shown in Table 2.
- Example 3 a triarylamine compound 6′-2 represented by the following structural formula was used instead of the compound 6-1 as the material of the first hole transport layer 5a, and the second hole transport layer 5b
- An organic EL device was produced under the same conditions except that the triarylamine compound 6′-2 represented by the following structural formula was used instead of the compound 1-5 of Synthesis Example 1 as a material.
- the first hole transport layer 5a and the second hole transport layer 5b functioned as an integral hole transport layer (film thickness 65 nm).
- the compound (6′-2) was a triarylamine compound having two triarylamine structures in the molecule.
- the layer structure is shown in Table 1, and the measurement results are shown in Table 2.
- Example 7 the triarylamine compound 6′-2 represented by the above structural formula was used instead of the compound 6-1 as the material of the first hole transport layer 5a, and the material of the second hole transport layer 5b was used.
- An organic EL device was produced under the same conditions except that the triarylamine compound 6′-2 represented by the structural formula was used in place of the compound 1-5 of Synthesis Example 1.
- the first hole transport layer 5a and the second hole transport layer 5b functioned as an integral hole transport layer (film thickness 65 nm).
- atmosphere was measured.
- the layer structure is shown in Table 1, and the measurement results are shown in Table 2.
- Example 11 the triarylamine compound 6′-2 represented by the above structural formula was used instead of the compound 6-1 as the material of the first hole transport layer 5a, and the second hole transport layer 5b
- An organic EL device was produced under the same conditions except that the triarylamine compound 6′-2 represented by the structural formula was used instead of the compound 1-5 of Synthesis Example 1 as a material.
- atmosphere was measured.
- the layer structure is shown in Table 1, and the measurement results are shown in Table 2.
- the device lifetime is the time when constant current driving was performed using the organic EL device produced in each Example and Comparative Example, with the light emission luminance (initial luminance) at the start of light emission being 7000 cd / m 2.
- the emission luminance was measured as the time until it attenuated to 6790 cd / m 2 (equivalent to 97% when the initial luminance was 100%: 97% attenuation).
- an arylamine compound having a specific structure and a heterocyclic compound (and a specific pyrimidine derivative) having a specific condensed ring structure improve the carrier balance inside the organic EL device, and further, a light emitting material It is combined to achieve a carrier balance that matches the characteristics of Therefore, compared with the conventional organic EL element, an organic EL element with high luminous efficiency and long life can be realized.
- the organic EL device of the present invention in which an arylamine compound having a specific structure and a heterocyclic compound having a specific condensed ring structure (and a specific pyrimidine derivative) are combined, luminous efficiency is improved and durability of the organic EL device is improved. Sex has been improved. For this reason, the organic EL element of the present invention can be used for home appliances and lighting applications, for example.
Abstract
Description
また、特許文献1および2に記載の芳香族アミン誘導体の中には、正孔の移動度が10-3cm2/Vs以上と優れた移動度を有する化合物もある。しかし、かかる芳香族アミン誘導体は、電子阻止性が不十分であるため、電子の一部が発光層を通り抜けてしまい、発光効率の向上が期待できない。よって、更なる高効率化のため、より電子阻止性が高く、薄膜がより安定で耐熱性の高い材料が求められている。
更に、特許文献3には、耐久性の高い芳香族アミン誘導体が報告されている。しかし、特許文献3の芳香族アミン誘導体は、電子写真感光体の電荷輸送材料として用いられるものであり、有機EL素子として用いた例については全く検討されていなかった。
前記正孔輸送層が、下記一般式(1)で表されるアリールアミン化合物を含有し、
前記発光層が、下記一般式(2)で表されるインデノインドール誘導体または下記一般式(3)で表されるカルバゾール誘導体を含有することを特徴とする有機EL素子が提供される。
Ar1~Ar4は、それぞれ、芳香族炭化水素基、芳香族複素環基ま
たは縮合多環芳香族基を表す。
A1は、芳香族炭化水素の2価基、芳香族複素環の2価基、縮合多環
芳香族の2価基または単結合を表し、
Ar5は、芳香族炭化水素基、芳香族複素環基または縮合多環芳香族
基を表し、
R1~R8は、それぞれ、水素原子;重水素原子;フッ素原子;塩素
原子;シアノ基;ニトロ基;炭素原子数1~6のアルキル基;炭素原子
数5~10のシクロアルキル基;炭素原子数2~6のアルケニル基;炭
素原子数1~6のアルキルオキシ基;炭素原子数5~10のシクロアル
キルオキシ基;芳香族炭化水素基;芳香族複素環基;縮合多環芳香族基
;アリールオキシ基;または置換基として芳香族炭化水素基、芳香族複
素環基もしくは縮合多環芳香族基を有するジ置換アミノ基;であり、
R1~R4は、単結合、置換もしくは無置換のメチレン基、酸素原子
または硫黄原子を介して互いに結合して環を形成してもよく、
R5~R8は、単結合、置換もしくは無置換のメチレン基、酸素原子
または硫黄原子を介して互いに結合して環を形成してもよく、
R1~R4の一部が脱離し、この脱離により生じた空位に、R1~R4
の他の基が、置換もしくは無置換のメチレン基、酸素原子、硫黄原子ま
たはモノアリールアミノ基を介して結合して環を形成してもよく、
R5~R8の一部が脱離し、この脱離により生じた空位に、R5~R8
の他の基が、置換もしくは無置換のメチレン基、酸素原子、硫黄原子ま
たはモノアリールアミノ基を介して結合して環を形成してもよい。
R9とR10は、それぞれ、炭素原子数1~6のアルキル基、芳香族
炭化水素基、芳香族複素環基または縮合多環芳香族基であり、R9とR
10は、単結合、置換もしくは無置換のメチレン基、酸素原子または硫
黄原子を介して互いに結合して環を形成してもよい。
A2は、芳香族炭化水素の2価基、芳香族複素環の2価基、縮合多環
芳香族の2価基または単結合を表し、
Ar6は、芳香族炭化水素基、芳香族複素環基または縮合多環芳香族
基を表し、
R11~R18は、それぞれ、水素原子;重水素原子;フッ素原子;塩
素原子;シアノ基;ニトロ基;炭素原子数1~6のアルキル基;炭素原
子数5~10のシクロアルキル基;炭素原子数2~6のアルケニル基;
炭素原子数1~6のアルキルオキシ基;炭素原子数5~10のシクロア
ルキルオキシ基;芳香族炭化水素基;芳香族複素環基;縮合多環芳香族
基;アリールオキシ基;または置換基として芳香族炭化水素基、芳香族
複素環基もしくは縮合多環芳香族基を有するジ置換アミノ基;であり、
R11~R14は、単結合、置換もしくは無置換のメチレン基、酸素原
子又は硫黄原子を介して互いに結合して環を形成してもよく、
R15~R18は、単結合、置換もしくは無置換のメチレン基、酸素原
子又は硫黄原子を介して互いに結合して環を形成してもよく、
R11~R14の一部が脱離し、この脱離により生じた空位に、R11
~R14の他の基が、置換もしくは無置換のメチレン基、酸素原子、硫
黄原子またはモノアリールアミノ基を介して結合して環を形成してもよ
く、
R15~R18の一部が脱離し、この脱離により生じた空位に、R15
~R18の他の基が、置換もしくは無置換のメチレン基、酸素原子、硫
黄原子またはモノアリールアミノ基を介して結合して環を形成してもよ
い。
2)前記電子輸送層が、下記一般式(4)で表されるピリミジン誘導体を含有すること、
Ar7は、芳香族炭化水素基、芳香族複素環基または縮合多環芳香族
基を表し、
Ar8、Ar9は、それぞれ、水素原子、芳香族炭化水素基、芳香族
複素環基または縮合多環芳香族基を表し、Ar8とAr9は同時に水素
原子となることはなく、
Bは、下記構造式(5)で示される1価基を表す、
Ar10は、芳香族複素環基を表し、
R19~R22は、それぞれ、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1~6
のアルキル基、芳香族炭化水素基、芳香族複素環基または縮合多環
芳香族基を表し、
R19~R22とAr10が、単結合、置換もしくは無置換のメチ
レン基、酸素原子または硫黄原子を介して互いに結合して環を形成
していてもよい、
3)前記ピリミジン誘導体が、下記一般式(4a)で表されること、
Ar7~Ar9およびBは、前記一般式(4)に示す通りである、
4)前記ピリミジン誘導体が、下記一般式(4b)で表されること、
Ar7~Ar9およびBは、前記一般式(4)に示す通りである、
5)前記一般式(4)において、Bが下記構造式(5a)で示される1価基であること、
Ar10およびR19~R22は前記構造式(5)に示す通りである、
6)前記正孔輸送層が、第一正孔輸送層および第二正孔輸送層の2層構造を有しており、該第二正孔輸送層が発光層側に位置しており且つ前記一般式(1)で表されるアリールアミン化合物を含有すること、
7)前記発光層が、赤色の発光材料を含有すること、
8)前記発光層が、燐光性の発光材料を含有すること、
9)前記した燐光性の発光材料が、イリジウムまたは白金を含む金属錯体であること、
が好ましい。
以下、本発明の有機EL素子を構成する各層について説明する。
陽極2は、ITOや金のような仕事関数の大きな電極材料の蒸着により、透明基板1上に設けられるものである。
陽極2と正孔輸送層5との間には、必要に応じて、正孔注入層3を設けてもよい。正孔注入層3には、公知の材料、例えば、スターバースト型のトリフェニルアミン誘導体;種々のトリフェニルアミン4量体;銅フタロシアニンに代表されるポルフィリン化合物;ヘキサシアノアザトリフェニレンのようなアクセプター性の複素環化合物;塗布型の高分子材料;などを用いることができる。また、後述する一般式(1)のアリールアミン化合物、一般式(6)のトリアリールアミン化合物または一般式(7)のトリアリールアミン化合物を用いることもできる。正孔注入層3には、一般式(6)または一般式(7)のトリアリールアミン化合物を用いることが好ましい。これらの(トリ)アリールアミン化合物は、正孔の移動度が高いからである。但し、正孔注入層3に一般式(1)、(6)または(7)の(トリ)アリールアミン化合物を用いる場合、正孔注入層3の組成と正孔輸送層5の組成とは異なっていなければならない。
正孔輸送層5は、上記の陽極2と発光層6との間に設けられるものであり、本発明では、この正孔輸送層5に、下記一般式(1)で表されるアリールアミン化合物(本明細書では「一般式(1)のアリールアミン化合物」と略称することがある。)が含まれている。一般式(1)のアリールアミン化合物は、正孔の移動度が高いため、正孔輸送層から発光層への正孔輸送効率を向上させることができるからである。
ハロゲン原子、例えばフッ素原子、塩素原子、臭素原子、ヨウ素原子;
炭素原子数1~6のアルキル基、例えばメチル基、エチル基、n-プロ
ピル基、イソプロピル基、n-ブチル基、イソブチル基、tert-ブチ
ル基、n-ペンチル基、イソペンチル基、ネオペンチル基、n-ヘキシル
基;
炭素原子数1~6のアルキルオキシ基、例えばメチルオキシ基、エチル
オキシ基、プロピルオキシ基;
アルケニル基、例えばビニル基、アリル基;
アリールオキシ基、例えばフェニルオキシ基、トリルオキシ基;
アリールアルキルオキシ基、例えばベンジルオキシ基、フェネチルオキ
シ基;
芳香族炭化水素基もしくは縮合多環芳香族基、例えばフェニル基、ビフ
ェニリル基、ターフェニリル基、ナフチル基、アントラセニル基、フェナ
ントレニル基、フルオレニル基、インデニル基、ピレニル基、ペリレニル
基、フルオランテニル基、トリフェニレニル基;
芳香族複素環基、例えばピリジル基、ピリミジニル基、トリアジニル基
、チエニル基、フリル基、ピロリル基、キノリル基、イソキノリル基、ベ
ンゾフラニル基、ベンゾチエニル基、インドリル基、カルバゾリル基、ベ
ンゾオキサゾリル基、ベンゾチアゾリル基、キノキサリニル基、ベンゾイ
ミダゾリル基、ピラゾリル基、ジベンゾフラニル基、ジベンゾチエニル基
、カルボリニル基;
アリールビニル基、例えばスチリル基、ナフチルビニル基;
アシル基、例えばアセチル基、ベンゾイル基;
炭素数1~6のアルキル基、炭素数1~6のアルキルオキシ基およびアルケニル基は、直鎖状であっても分枝状であってもよい。これらの置換基には、さらに前記例示した置換基が置換していても良い。また、これらの置換基同士は、互いに独立して存在して環を形成していなくてもよいが、単結合、置換もしくは無置換のメチレン基、酸素原子または硫黄原子を介して互いに結合して環を形成していてもよい。
4,4’’-ジアミノ-[1,1’;3’,1’’]ターフェニル骨格;
3,3’’-ジアミノ-[1,1’;3’,1’’]ターフェニル骨格;
2,2’’-ジアミノ-[1,1’;3’,1’’]ターフェニル骨格;
4,4’’-ジアミノ-[1,1’;2’,1’’]ターフェニル骨格;
3,3’’-ジアミノ-[1,1’;2’,1’’]ターフェニル骨格;
2,2’’-ジアミノ-[1,1’;2’,1’’]ターフェニル骨格;
2,4’’-ジアミノ-[1,1’;4’,1’’]ターフェニル骨格;
2,2’’-ジアミノ-[1,1’;4’,1’’]ターフェニル骨格;
3,3’’-ジアミノ-[1,1’;4’,1’’]ターフェニル骨格;
特に、下記一般式(1a-a)、(1a-b)、(1b-a)、(1c-a)、(1c-b)または(1c-c)で表されるアリールアミン化合物が好ましい。
ベンジジン誘導体、例えば
N,N’-ジフェニル-N,N’-ジ(m-トリル)ベンジジン
(TPD)、
N,N’-ジフェニル-N,N’-ジ(α-ナフチル)ベンジジン
(NPD)、
N,N,N’,N’-テトラビフェニリルベンジジン;
1,1-ビス[4-(ジ-4-トリルアミノ)フェニル]シクロヘキサ
ン(TAPC);
分子中にトリアリールアミン構造を2個有するトリアリールアミン化合
物であって、該トリアリールアミン構造が、ヘテロ原子を含まない2価基
または単結合で連結しているトリアリールアミン化合物、例えば
後述の一般式(6)で表されるトリアリールアミン化合物;
分子中にトリアリールアミン構造を4個有するトリアリールアミン化合
物であって、該トリアリールアミン構造が、ヘテロ原子を含まない2価基
または単結合で連結しているトリアリールアミン化合物、例えば
後述の一般式(7)で表されるトリアリールアミン化合物;
種々のトリフェニルアミン3量体;
本発明においては、発光層6が、下記一般式(2)で表されるインデノインドール誘導体(本明細書では「一般式(2)のインデノインドール誘導体」と略称することがある。)または下記一般式(3)で表されるカルバゾール誘導体(本明細書では「一般式(3)のカルバゾール誘導体」と略称することがある。)を含んでいることが重要である。
一般式(2)において、A1は、芳香族炭化水素の2価基、芳香族複素環の2価基、縮合多環芳香族の2価基または単結合を表す。A1で表される芳香族炭化水素の2価基、芳香族複素環の2価基または縮合多環芳香族の2価基は、芳香族炭化水素、芳香族複素環または縮合多環芳香族から水素原子を2個取り除いてできる2価基である。この場合の芳香族炭化水素、芳香族複素環または縮合多環芳香族としては、具体的に、ベンゼン、ビフェニル、ターフェニル、テトラキスフェニル、スチレン、ナフタレン、アントラセン、アセナフタレン、フルオレン、フェナントレン、インダン、ピレン、トリフェニレン、ピリジン、ピリミジン、トリアジン、ピロール、フラン、チオフェン、キノリン、イソキノリン、ベンゾフラン、ベンゾチオフェン、インドリン、カルバゾール、カルボリン、ベンゾオキサゾール、ベンゾチアゾール、キノキサリン、ベンゾイミダゾール、ピラゾール、ジベンゾフラン、ジベンゾチオフェン、ナフチリジン、フェナントロリン、アクリジンなどをあげることができる。
一般式(2)においてAr5は、芳香族炭化水素基、芳香族複素環基または縮合多環芳香族基を表す。Ar5で表される芳香族炭化水素基、芳香族複素環基または縮合多環芳香族基としては、前記一般式(1)中のAr1~Ar4で表される芳香族炭化水素基、芳香族複素環基または縮合多環芳香族基に関して示したものと同様のものをあげることができる。
一般式(2)において、R1~R8は、それぞれ、水素原子;重水素原子;フッ素原子;塩素原子;シアノ基;ニトロ基;炭素原子数1~6のアルキル基;炭素原子数5~10のシクロアルキル基;炭素原子数2~6のアルケニル基;炭素原子数1~6のアルキルオキシ基;炭素原子数5~10のシクロアルキルオキシ基;芳香族炭化水素基;芳香族複素環基;縮合多環芳香族基;アリールオキシ基;または置換基として芳香族炭化水素基、芳香族複素環基もしくは縮合多環芳香族基を有するジ置換アミノ基;である。尚、炭素原子数1~6のアルキル基、炭素原子数2~6のアルケニル基、炭素原子数1~6のアルキルオキシ基は、直鎖状でも分枝状でもよい。
ハロゲン原子、例えばフッ素原子、塩素原子、臭素原子、ヨウ素原子;
炭素原子数1~6のアルキルオキシ基、例えばメチルオキシ基、エチル
オキシ基、プロピルオキシ基;
アルケニル基、例えばビニル基、アリル基;
アリールオキシ基、例えばフェニルオキシ基、トリルオキシ基;
アリールアルキルオキシ基、例えばベンジルオキシ基、フェネチルオキ
シ基;
芳香族炭化水素基または縮合多環芳香族基、例えばフェニル基、ビフェ
ニリル基、ターフェニリル基、ナフチル基、アントラセニル基、フェナン
トレニル基、フルオレニル基、インデニル基、ピレニル基、ペリレニル基
、フルオランテニル基、トリフェニレニル基;
芳香族複素環基、例えばピリジル基、ピリミジニル基、トリアジニル基
、チエニル基、フリル基、ピロリル基、キノリル基、イソキノリル基、ベ
ンゾフラニル基、ベンゾチエニル基、インドリル基、カルバゾリル基、ベ
ンゾオキサゾリル基、ベンゾチアゾリル基、キノキサリニル基、ベンゾイ
ミダゾリル基、ピラゾリル基、ジベンゾフラニル基、ジベンゾチエニル基
、カルボリニル基;
芳香族炭化水素基で置換されたジ置換アミノ基、例えばジフェニルアミ
ノ基;
縮合多環芳香族基で置換されたジ置換アミノ基、例えばジナフチルアミ
ノ基;
芳香族複素環基で置換されたジ置換アミノ基、例えばジピリジルアミノ
基、ジチエニルアミノ基;
芳香族炭化水素基、縮合多環芳香族基または芳香族複素環基から選択さ
れる置換基で置換されたジ置換アミノ基;
尚、アルケニル基、炭素原子数1~6のアルキルオキシ基は、直鎖状でも分枝状でもよい。これらの置換基には、さらに、前記例示した置換基が置換していても良い。また、これらの置換基同士は、互いに独立して存在して環を形成していなくてもよいが、単結合、置換もしくは無置換のメチレン基、酸素原子または硫黄原子を介して互いに結合して環を形成していてもよい。
一般式(2)において、R9とR10は、それぞれ、炭素原子数1~6のアルキル基、芳香族炭化水素基、芳香族複素環基または縮合多環芳香族基である。尚、炭素原子数1~6のアルキル基は、直鎖状でも分枝状でもよい。
一般式(3)において、A2は、芳香族炭化水素の2価基、芳香族複素環の2価基、縮合多環芳香族の2価基または単結合を表す。A2で表される芳香族炭化水素の2価基、芳香族複素環の2価基または縮合多環芳香族の2価基としては、前記一般式(2)中のA1で表される芳香族炭化水素の2価基、芳香族複素環の2価基または縮合多環芳香族の2価基に関して示したものと同様のものをあげることができる。これらの2価基は、無置換でもよいが置換基を有していてもよい。置換基としては、前記一般式(1)中のAr1~Ar4で表される芳香族炭化水素基、芳香族複素環基または縮合多環芳香族が有してもよい置換基として示したものと同じものをあげることができる。置換基がとりうる態様も同様である。
一般式(3)において、Ar6は、芳香族炭化水素基、芳香族複素環基または縮合多環芳香族基を表す。Ar6で表される芳香族炭化水素基、芳香族複素環基または縮合多環芳香族基としては、前記一般式(1)中のAr1~Ar4で表される芳香族炭化水素基、芳香族複素環基または縮合多環芳香族基に関して示したものと同様のものをあげることができる。これらの基は、無置換でもよいが置換基を有していてもよい。置換基としては、前記一般式(1)中のAr1~Ar4で表される芳香族炭化水素基、芳香族複素環基または縮合多環芳香族基が有してもよい置換基として示したものと同様のものをあげることができる。置換基がとりうる態様も同様である。
一般式(3)において、R11~R18は、それぞれ、水素原子;重水素原子;フッ素原子;塩素原子;シアノ基;ニトロ基;炭素原子数1~6のアルキル基;炭素原子数5~10のシクロアルキル基;炭素原子数2~6のアルケニル基;炭素原子数1~6のアルキルオキシ基;炭素原子数5~10のシクロアルキルオキシ基;芳香族炭化水素基;芳香族複素環基;縮合多環芳香族基;アリールオキシ基;または置換基として芳香族炭化水素基、芳香族複素環基もしくは縮合多環芳香族基を有するジ置換アミノ基;を表す。尚、炭素原子数1~6のアルキル基、炭素原子数2~6のアルケニル基、炭素原子数1~6のアルキルオキシ基は、直鎖状でも分枝状でもよい。
カルバゾール誘導体、例えば
4,4’-ジ(N-カルバゾリル)ビフェニル(CBP)、
TCTA、
mCP;
更にまた、以下の電子輸送性のホスト材料を用いることもできる。
p-ビス(トリフェニルシリル)ベンゼン(UGH2);
2,2’,2’’-(1,3,5-フェニレン)-トリス(1-フェニ
ル-1H-ベンズイミダゾール)(TPBI);
このようなホスト材料を用いると、高性能の有機EL素子を作製することができる。
本発明において、上述した発光層6の上には電子輸送層7が設けられている。電子輸送層7は、公知の電子輸送材料から形成されていてよく、例えばAlq3、BAlqをはじめとするキノリノール誘導体の金属錯体などの各種金属錯体;トリアゾール誘導体;トリアジン誘導体;オキサジアゾール誘導体;ピリジン誘導体;アントラセン誘導体;ベンズイミダゾール誘導体;チアジアゾール誘導体;ベンゾトリアゾール誘導体;カルボジイミド誘導体;キノキサリン誘導体;ピリドインドール誘導体;フェナントロリン誘導体;シロール誘導体;などから形成されていてよい。
上記一般式(4)、(4a)および(4b)において、Ar7は、芳香族炭化水素基、芳香族複素環基または縮合多環芳香族基を表し、Ar8、Ar9は、それぞれ、水素原子、芳香族炭化水素基、芳香族複素環基または縮合多環芳香族基を表す。Ar8とAr9は同時に水素原子となることはない。
ハロゲン原子、例えばフッ素原子、塩素原子、臭素原子、ヨウ素原子;
炭素原子数1~6のアルキル基、例えばメチル基、エチル基、n-プロ
ピル基、イソプロピル基、n-ブチル基、イソブチル基、tert-ブチ
ル基、n-ペンチル基、イソペンチル基、ネオペンチル基、n-ヘキシル
基;
炭素原子数1~6のアルキルオキシ基、例えばメチルオキシ基、エチル
オキシ基、プロピルオキシ基;
アルケニル基、例えばビニル基、アリル基;
アリールオキシ基、例えばフェニルオキシ基、トリルオキシ基;
アリールアルキルオキシ基、例えばベンジルオキシ基、フェネチルオキ
シ基;
芳香族炭化水素基または縮合多環芳香族基、例えばフェニル基、ビフェ
ニリル基、ターフェニリル基、ナフチル基、アントラセニル基、フェナン
トレニル基、フルオレニル基、インデニル基、ピレニル基、ペリレニル基
、フルオランテニル基、トリフェニレニル基、スピロビフルオレニル基、
アセナフテニル基;
芳香族複素環基、例えばピリジル基、チエニル基、フリル基、ピロリル
基、キノリル基、イソキノリル基、ベンゾフラニル基、ベンゾチエニル基
、インドリル基、カルバゾリル基、ベンゾオキサゾリル基、ベンゾチアゾ
リル基、キノキサリニル基、ベンゾイミダゾリル基、ピラゾリル基、ジベ
ンゾフラニル基、ジベンゾチエニル基、アザフルオレニル基、ジアザフル
オレニル基、カルボリニル基、アザスピロビフルオレニル基、ジアザスピ
ロビフルオレニル基;
アリールビニル基、例えばスチリル基、ナフチルビニル基;
アシル基、例えばアセチル基、ベンゾイル基;
炭素原子数1~6のアルキル基、アルケニル基、炭素原子数1~6のアルキルオキシ基は、直鎖状でも分枝状でもよい。これらの置換基にはさらに、前記例示した置換基が置換していても良い。また、これらの置換基は、独立して存在して環を形成していなくてもよいが、単結合、置換もしくは無置換のメチレン基、酸素原子または硫黄原子を介して互いに結合して環を形成していてもよく、これらの置換基と当該置換基が結合しているAr7、Ar8またはAr9が酸素原子または硫黄原子を介して互いに結合して環を形成していてもよい。
Ar7がフェニル基の場合、このフェニル基は、置換もしくは無置換の縮合多環芳香族基またはフェニル基を置換基として有していることが好ましく、ナフチル基、フェナントレニル基、ピレニル基、フルオランテニル基、トリフェニレニル基、スピロビフルオレニル基またはフェニル基から選ばれる置換基を有していることがより好ましい。フェニル基が有する置換基とフェニル基とが酸素原子または硫黄原子を介して互いに結合して環を形成することも好ましい。
この場合のフェニル基の置換基としては、芳香族炭化水素基、例えばフェニル基、ビフェニリル基、ターフェニル基;縮合多環芳香族基、例えばナフチル基、アセナフテニル基、フェナントレニル基、フルオレニル基、インデニル基、ピレニル基、ペリレニル基、フルオランテニル基、トリフェニレニル基、スピロビフルオレニル基;含酸素芳香族複素環基、例えばフリル基、ベンゾフラニル基、ジベンゾフラニル基;または含硫黄芳香族複素環基、例えばチエニル基、ベンゾチエニル基、ジベンゾチエニル基;が好ましく、フェニル基、ナフチル基、フェナントレニル基、フルオレニル基、ピレニル基、フルオランテニル基、トリフェニレニル基、スピロビフルオレニル基、ジベンゾフラニル基、ジベンゾチエニル基がより好ましい。フェニル基が有する置換基とフェニル基とが酸素原子または硫黄原子を介して互いに結合して環を形成することも好ましい。
この場合のフェニル基の置換基としては、芳香族炭化水素基、例えばフェニル基、ビフェニリル基、ターフェニル基;縮合多環芳香族基、例えばナフチル基、アセナフテニル基、フェナントレニル基、フルオレニル基、インデニル基、ピレニル基、ペリレニル基、フルオランテニル基、トリフェニレニル基、スピロビフルオレニル基;含酸素芳香族複素環基、例えばフリル基、ベンゾフラニル基、ジベンゾフラニル基;または含硫黄芳香族複素環基、例えばチエニル基、ベンゾチエニル基、ジベンゾチエニル基;が好ましく、フェニル基、ナフチル基、フェナントレニル基、フルオレニル基、ピレニル基、フルオランテニル基、トリフェニレニル基、スピロビフルオレニル基、ジベンゾフラニル基、ジベンゾチエニル基がより好ましい。フェニル基が有する置換基とフェニル基とが酸素原子または硫黄原子を介して互いに結合して環を形成することも好ましい。
上記一般式(4)、(4a)および(4b)において、Bは、下記構造式(5)で表される1価基を表し、薄膜の安定性の観点から、好適には、下記構造式(5a)で表される1価基を表す。構造式(5a)は、ベンゼン環におけるAr10の結合位置が、一般式(4)に示されるピリミジン環との結合位置に対し、メタ位となっている。
本発明の有機EL素子は、電子輸送層7と陰極9の間に電子注入層8を有してもよい。電子注入層8には、フッ化リチウム、フッ化セシウムなどのアルカリ金属塩;フッ化マグネシウムなどのアルカリ土類金属塩;酸化アルミニウムなどの金属酸化物;などが含まれていてもよいが、電子輸送層と陰極の好ましい選択においては、これを省略することができる。
本発明の有機EL素子の陰極9としては、アルミニウムのような仕事関数の低い電極材料や、マグネシウム銀合金、マグネシウムインジウム合金、アルミニウムマグネシウム合金のような、より仕事関数の低い合金が電極材料として用いられる。
本発明の有機EL素子は、必要に応じてその他の層を有していてもよい。例えば、図1には示されていないが、正孔輸送層5と発光層6との間には電子阻止層を設けることができ、発光層6と電子輸送層7との間には正孔阻止層を設けることもできる。
電子阻止層には、電子阻止作用を有する公知の化合物を用いることができる。公知の化合物としては、以下を例示することができる。
カルバゾール誘導体、例えば
4,4’,4’’-トリ(N-カルバゾリル)トリフェニルアミン
(TCTA);
9,9-ビス[4-(カルバゾール-9-イル)フェニル]フルオレ
ン;
1,3-ビス(カルバゾール-9-イル)ベンゼン(mCP);
2,2-ビス(4-カルバゾール-9-イルフェニル)アダマンタン
(Ad-Cz);
トリフェニルシリル基とトリアリールアミン構造を有する化合物、例え
ば
9-[4-(カルバゾール-9-イル)フェニル]-9-[4-(ト
リフェニルシリル)フェニル]-9H-フルオレン;
正孔阻止層には、バソクプロイン(BCP)などのフェナントロリン誘導体や、アルミニウム(III)ビス(2-メチル-8-キノリナート)-4-フェニルフェノレート(BAlq)などのキノリノール誘導体の金属錯体の他、各種の希土類錯体、トリアゾール誘導体、トリアジン誘導体、オキサジアゾール誘導体など、正孔阻止作用を有する化合物を用いることができる。これらの材料は単独で成膜に供してもよいが、他の材料とともに混合して成膜に供してもよい。また、これらの材料は電子輸送層の材料を兼ねてもよい。
本発明の有機EL素子においては、正孔輸送層5の形成に一般式(1)で表されるアリールアミン化合物が使用されるが、このようなアリールアミン化合物を含む正孔輸送層5が二層構造であることが好ましい。即ち、図1に示されているように、正孔輸送層5を、陽極2側に位置している第一正孔輸送層5aと、発光層6側に位置している第二正孔輸送層5bとに分割した2層構造とすることが好ましい。
上記一般式(6)において、r23~r28は、それぞれ、ベンゼン環に結合している基R23~R28の数を示す整数である。r23、r24、r27、r28は0~5の整数を表し、r25、r26は0~4の整数を表す。r23~r28としては、0~3の整数が好ましく、0~2の整数がより好ましい。
一般式(6)において、R23~R28は、重水素原子、フッ素原子、塩素原子、シアノ基、ニトロ基、炭素原子数1~6のアルキル基、炭素原子数5~10のシクロアルキル基、炭素原子数2~6のアルケニル基、炭素原子数1~6のアルキルオキシ基、炭素原子数5~10のシクロアルキルオキシ基、芳香族炭化水素基、芳香族複素環基、縮合多環芳香族基またはアリールオキシ基を表す。尚、炭素原子数1~6のアルキル基、炭素原子数2~6のアルケニル基、炭素原子数1~6のアルキルオキシ基は、直鎖状でも分枝状でもよい。
ハロゲン原子、例えばフッ素原子、塩素原子、臭素原子、ヨウ素原子;
炭素原子数1~6のアルキルオキシ基、例えばメチルオキシ基、エチル
オキシ基、プロピルオキシ基;
アルケニル基、例えばビニル基、アリル基;
アリールオキシ基、例えばフェニルオキシ基、トリルオキシ基;
アリールアルキルオキシ基、例えばベンジルオキシ基、フェネチルオキ
シ基;
芳香族炭化水素基または縮合多環芳香族基、例えばフェニル基、ビフェ
ニリル基、ターフェニリル基、ナフチル基、アントラセニル基、フェナン
トレニル基、フルオレニル基、インデニル基、ピレニル基、ペリレニル基
、フルオランテニル基、トリフェニレニル基;
芳香族複素環基、例えばピリジル基、ピリミジニル基、トリアジニル基
、チエニル基、フリル基、ピロリル基、キノリル基、イソキノリル基、ベ
ンゾフラニル基、ベンゾチエニル基、インドリル基、カルバゾリル基、ベ
ンゾオキサゾリル基、ベンゾチアゾリル基、キノキサリニル基、ベンゾイ
ミダゾリル基、ピラゾリル基、ジベンゾフラニル基、ジベンゾチエニル基
、カルボリニル基;
アルケニル基および炭素原子数1~6のアルキルオキシ基は、直鎖状でも分枝状でもよい。これらの置換基にはさらに、前記例示した置換基が置換していても良い。また、これらの置換基同士は、独立して存在して環を形成していなくてもよいが、単結合、置換もしくは無置換のメチレン基、酸素原子または硫黄原子を介して互いに結合して環を形成していてもよい。
一般式(7)において、r29~r40は、それぞれ、ベンゼン環に結合している基R29~R40の数を示す整数である。r29、r30、r33、r36、r39、r40は0~5の整数を表し、r31、r32、r34、r35、r37、r38は0~4の整数を表す。r29~r40としては、0~3の整数が好ましく、0~2の整数がより好ましい。
一般式(7)において、R29~R40は、重水素原子、フッ素原子、塩素原子、シアノ基、ニトロ基、炭素原子数1~6のアルキル基、炭素原子数5~10のシクロアルキル基、炭素原子数2~6のアルケニル基、炭素原子数1~6のアルキルオキシ基、炭素原子数5~10のシクロアルキルオキシ基、芳香族炭化水素基、芳香族複素環基、縮合多環芳香族基またはアリールオキシ基を表す。尚、炭素原子数1~6のアルキル基、炭素原子数2~6のアルケニル基、炭素原子数1~6のアルキルオキシ基は、直鎖状でも分枝状でもよい。
一般式(7)において、L2~L4は、2つのトリアリールアミン骨格を結合する橋絡基であり、それぞれ、下記構造式(B’)もしくは前記構造式(C)~(G)で示される2価基または単結合を表す。尚、下記構造式(B’)で表される2価基は、無置換でもよいが、図64の例示化合物7-17のように、重水素で置換されていてもよい。
4-{(ビフェニル-4-イル)-フェニルアミノ)-4’’-{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニルアミノ}-1,1’:3’,1’’-ターフェニルの合成;
窒素置換した反応容器に、
N-(ビフェニル-4-イル)-N-(4-ブロモフェニル)アニリ
ン 8.0g、
N-(9,9-ジメチル-9H-フルオレン-2-イル)-N-{3
’-(4,4,5,5-テトラメチル-[1,3,2]ジオキサボラン
-2-イル)ビフェニル-4-イル}アニリン 11.4g、
炭酸カリウム 7.5g、
水 64ml、
トルエン 64ml、
エタノール 16mlおよび
テトラキス(トリフェニルホスフィン)パラジウム 0.8g
を加えて加熱し、70℃で16時間撹拌して、混合液を調整した。混合液を室温まで冷却し、酢酸エチルと水を加えた後、分液操作によって有機層を採取した。有機層を濃縮した後、THF/アセトンの混合溶媒を用いての再結晶を行った。その結果、4-{(ビフェニル-4-イル)-フェニルアミノ)-4’’-{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニルアミノ}-1,1’:3’,1’’-ターフェニル(化合物1-5)の白色粉体9.54g(収率69%)を得た。
δ(ppm)=7.86(1H)
7.68-6.97(37H)
1.41(6H)
4-{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニルアミノ}-4’’-{(ナフタレン-1-イル)-フェニルアミノ}-1,1’:3’,1’’-ターフェニルの合成;
合成例1において、
N-(ビフェニル-4-イル)-N-(4-ブロモフェニル)アニリ
ン
に代えて
N-(3’-ブロモビフェニル-4-イル)-N-(ナフタレン-1
-イル)アニリン
を用い、
N-(9,9-ジメチル-9H-フルオレン-2-イル)-N-{3
’-(4,4,5,5-テトラメチル-[1,3,2]ジオキサボラン
-2-イル)ビフェニル-4-イル}アニリン
に代えて
4-{N-(9,9-ジメチル-9H-フルオレン-2-イル)-フ
ェニルアミノ}-フェニルボロン酸
を用い、同様の条件で反応を行った。その結果、4-{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニルアミノ}-4’’-{(ナフタレン-1-イル)-フェニルアミノ}-1,1’:3’,1’’-ターフェニル(化合物1-6)の淡黄白色粉体7.88g(収率62%)を得た。
δ(ppm)=7.98(1H)
7.92(1H)
7.84-7.75(2H)
7.70-6.94(32H)
1.49(6H)
3、3’’-ビス{(ビフェニル-4-イル)-フェニルアミノ}-1,1’:4’,1’’-ターフェニルの合成;
窒素置換した反応容器に、
1,4-ジブロモベンゼン 6.20g、
N-(ビフェニル-4-イル)-N-{3-(4,4,5,5-テト
ラメチル-[1,3,2]ジオキサボラン-2-イル)フェニル}アニ
リン 25.1g、
炭酸カリウム 10.8g、
水 39ml、
トルエン 380mlおよび
エタノール 95ml
を加え、30分間超音波を照射しながら窒素ガスを通気し、混合液を調整した。かかる混合液に、テトラキス(トリフェニルホスフィン)パラジウム0.95gを加えて加熱し、18時間還流撹拌した。その後、混合液を室温まで冷却し、水200mlおよびヘプタン190mlを加えた後、析出物をろ過によって採取した。析出物を1,2-ジクロロベンゼン1200mlに加熱溶解し、シリカゲル39gを用いた吸着精製を行い、続いて、活性白土19gを用いた吸着精製を行った。その後、メタノール725mlを加え、析出する粗製物をろ過によって採取した。粗製物について、1,2-ジクロロメタン/メタノールの混合溶媒を用いた晶析を繰り返した後、メタノール300mlを用いた還流洗浄を行った。その結果、3、3’’-ビス{(ビフェニル-4-イル)-フェニルアミノ}-1,1’:4’,1’’-ターフェニル(化合物1-21)の白色粉体15.22g(収率81%)を得た。
δ(ppm)=7.61(2H)
7.56-6.83(38H)
2、2’’-ビス{(ビフェニル-4-イル)-フェニルアミノ}-1,1’:4’,1’’-ターフェニルの合成;
合成例3において、
N-(ビフェニル-4-イル)-N-{3-(4,4,5,5-テト
ラメチル-[1,3,2]ジオキサボラン-2-イル)フェニル}アニ
リン
に代えて
N-(ビフェニル-4-イル)-N-{2-(4,4,5,5-テト
ラメチル-[1,3,2]ジオキサボラン-2-イル)フェニル}アニ
リン
を用い、同様の条件で反応を行った。その結果、2、2’’-ビス{(ビフェニル-4-イル)-フェニルアミノ}-1,1’:4’,1’’-ターフェニル(化合物1-22)の白色紛体11.11g(収率58%)を得た。
δ(ppm)=7.52(4H)
7.40-7.20(18H)
7.03(8H)
6.90-6.75(10H)
4-{(ビフェニル-4-イル)-フェニルアミノ}-2’’-{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニルアミノ}-1,1’:4’,1’’-ターフェニルの合成;
窒素置換した反応容器に、
N-(ビフェニル-4-イル)-N-(2’’-ブロモ-1,1’:
4’,1’’-ターフェニル-4-イル)アニリン
10.0g、
2-(フェニルアミノ)-9,9-ジメチル-9H-フルオレン
6.2g、
酢酸パラジウム 0.081g、
t-ブトキシナトリウム 3.5g、
トリ-t-ブチルホスフィンの50%(w/v)トルエン溶液
0.146gおよび
トルエン 100ml
を加えて加熱し、一夜、100℃で撹拌して、混合液を調整した。ろ過によって混合液から不溶物を除き、濃縮をした。次いで、カラムクロマトグラフ(担体:シリカゲル、溶離液:ヘプタン/ジクロロメタン)を用いた精製を行った。その結果、4-{(ビフェニル-4-イル)-フェニルアミノ}-2’’-{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニルアミノ}-1,1’:4’,1’’-ターフェニル(化合物1-32)の白色紛体4.77g(収率35%)を得た。
δ(ppm)=7.61-7.48(4H)
7.42-6.92(32H)
6.81(1H)
6.76(1H)
1.28(6H)
4,4’’-ビス{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニルアミノ}-1,1’:3’,1’’-ターフェニルの合成;
窒素置換した反応容器に、
4,4’’-ジブロモ-1,1’:3’,1’’-ターフェニル
8.81g、
2-(フェニルアミノ)-9,9-ジメチル-9H-フルオレン
13.6g、
t-ブトキシナトリウム 5.12g、
トリス(ジベンジリデンアセトン)ジパラジウム 0.33gおよび
トリ-t-ブチルホスフィンの50%(w/v)トルエン溶液
0.63ml
を加えて加熱し、2時間還流撹拌し、混合液を調整した。かかる混合液を放冷した後、メタノールを加え、析出物をろ過によって採取した。析出物をクロロベンゼンに加熱溶解し、シリカゲルを用いた吸着精製を行った。続いて、活性白土を用いた吸着精製を行った。次いで、クロロベンゼン/メタノールの混合溶媒を用いた晶析を行った。その後、メタノールを用いた還流洗浄を行った。その結果、4,4’’-ビス{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニルアミノ}-1,1’:3’,1’’-ターフェニル(化合物1-34)の白色粉体16.25g(収率90%)を得た。
δ(ppm)=7.84(1H)
7.70-7.03(35H)
1.48(12H)
2-{(ビフェニル-4-イル)-フェニルアミノ}-4’’-{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニルアミノ}-1,1’:4’,1’’-ターフェニルの合成;
合成例5において、
N-(ビフェニル-4-イル)-N-(2’’-ブロモ-1,1’:
4’,1’’-ターフェニル-4-イル)アニリン
に代えて
N-(9,9-ジメチル-9H-フルオレン-2-イル)-N-(2
’’-ブロモ-1,1’:4’,1’’-ターフェニル-4-イル)ア
ニリン
を用い、
2-(フェニルアミノ)-9,9-ジメチル-9H-フルオレン
に代えて
N-(ビフェニル-4-イル)アニリン
を用い、同様の条件で反応を行った。その結果、2-{(ビフェニル-4-イル)-フェニルアミノ}-4’’-{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニルアミノ}-1,1’:4’,1’’-ターフェニル(化合物1-37)の白色粉体11.7g(収率73%)を得た。
δ(ppm)=7.68(1H)
7.64-6.84(37H)
1.48(6H)
4,4’’-ビス{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニルアミノ}-1,1’:2’,1’’-ターフェニルの合成;
合成例3において、
1,4-ジブロモベンゼン
に代えて
1,2-ジヨードベンゼン
を用い、
N-(ビフェニル-4-イル)-N-{3-(4,4,5,5-テト
ラメチル-[1,3,2]ジオキサボラン-2-イル)フェニル}アニ
リン
に代えて
4-{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニ
ルアミノ}-フェニルボロン酸
を用い、同様の条件で反応を行った。その結果、4,4’’-ビス{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニルアミノ}-1,1’:2’,1’’-ターフェニル(化合物1-38)の白色粉体6.6g(収率39%)を得た。
δ(ppm)=7.64(2H)
7.58(2H)
7.45-6.99(32H)
1.38(12H)
4,4’’-ビス{ビス(ビフェニル-4-イル)アミノ}-1,1’:2’,1’’-ターフェニルの合成;
合成例3において、
1,4-ジブロモベンゼン
に代えて
1,2-ジヨードベンゼン
を用い、
N-(ビフェニル-4-イル)-N-{3-(4,4,5,5-テト
ラメチル-[1,3,2]ジオキサボラン-2-イル)フェニル}アニ
リン
に代えて
4-{ビス(ビフェニル-4-イル)アミノ}-フェニルボロン酸
を用い、同様の条件で反応を行った。その結果、4,4’’-ビス{ビス(ビフェニル-4-イル)アミノ}-1,1’:2’,1’’-ターフェニル(化合物1-39)の白色粉体4.6g(収率24%)を得た。
δ(ppm)=7.57-7.28(32H)
7.21(8H)
7.11(8H)
4,4’’-ビス{(ビフェニル-4-イル)-(ナフタレン-1-イル)アミノ}-1,1’:2’,1’’-ターフェニルの合成;
合成例6において、
4,4’’-ジブロモ-1,1’:3’,1’’-ターフェニル
に代えて
4,4’’-ジブロモ-1,1’:2’,1’’-ターフェニル
を用い、
2-(フェニルアミノ)-9,9-ジメチル-9H-フルオレン
に代えて
(ビフェニル-4-イル)-(ナフタレン-1-イル)アミン
を用い、同様の条件で反応を行った。その結果、4,4’’-ビス{(ビフェニル-4-イル)-(ナフタレン-1-イル)アミノ}-1,1’:2’,1’’-ターフェニル(化合物1-41)の白色粉体5.0g(収率30%)を得た。
δ(ppm)=7.93-7.84(4H)
7.79(2H)
7.60-7.26(24H)
7.25-6.92(14H)
4,4’’-ビス[{4-(ナフタレン-1-イル)フェニル}-フェニルアミノ]-1,1’:2’,1’’-ターフェニルの合成;
合成例6において、
4,4’’-ジブロモ-1,1’:3’,1’’-ターフェニル
に代えて
4,4’’-ジブロモ-1,1’:2’,1’’-ターフェニル
を用い、
2-(フェニルアミノ)-9,9-ジメチル-9H-フルオレン
に代えて
N-{4-(ナフタレン-1-イル)フェニル}アニリン
を用い、同様の条件で反応を行った。その結果、4,4’’-ビス[{4-(ナフタレン-1-イル)フェニル}-フェニルアミノ]-1,1’:2’,1’’-ターフェニル(化合物1-42)の白色粉体7.3g(収率43%)を得た。
δ(ppm)=8.01(2H)
7.91(2H)
7.84(2H)
7.53-6.98(38H)
4,4’’-ビス[{4-(ナフタレン-1-イル)フェニル}-フェニルアミノ]-1,1’:3’,1’’-ターフェニルの合成;
合成例6において、
2-(フェニルアミノ)-9,9-ジメチル-9H-フルオレン
に代えて
N-{4-(ナフタレン-1-イル)フェニル}アニリン
を用い、同様の条件で反応を行った。その結果、4,4’’-ビス[{4-(ナフタレン-1-イル)フェニル}-フェニルアミノ]-1,1’:3’,1’’-ターフェニル(化合物1-45)の白色粉体16.7g(収率79%)を得た。
δ(ppm)=8.08(2H)
7.94(2H)
7.90-7.80(3H)
7.65-7.00(37H)
2,2’’-ビス{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニルアミノ}-1,1’:3’,1’’-ターフェニルの合成;
合成例3において、
1,4-ジブロモベンゼン
に代えて
1,3-ジヨードベンゼン
を用い、
N-(ビフェニル-4-イル)-N-{3-(4,4,5,5-テト
ラメチル-[1,3,2]ジオキサボラン-2-イル)フェニル}アニ
リン
に代えて
2-{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニ
ルアミノ}-フェニルボロン酸
を用い、同様の条件で反応を行った。その結果、2,2’’-ビス{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニルアミノ}-1,1’:3’,1’’-ターフェニル(化合物1-47)の白色粉体4.2g(収率25%)を得た。
δ(ppm)=7.60(2H)
7.38-7.09(14H)
6.95-6.71(14H)
6.66-6.56(4H)
6.35(2H)
1.26(12H)
2,2’’-ビス{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニルアミノ}-1,1’:4’,1’’-ターフェニルの合成;
合成例3において、
N-(ビフェニル-4-イル)-N-{3-(4,4,5,5-テト
ラメチル-[1,3,2]ジオキサボラン-2-イル)フェニル}アニ
リン
に代えて
2-{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニ
ルアミノ}-フェニルボロン酸
を用い、同様の条件で反応を行った。その結果、2,2’’-ビス{(9,9-ジメチル-9H-フルオレン-2-イル)-フェニルアミノ}-1,1’:4’,1’’-ターフェニル(化合物1-49)の白色粉体13.7g(収率76%)を得た。
δ(ppm)=7.53(2H)
7.35-6.81(30H)
6.76(2H)
6.67(2H)
1.29(12H)
4,4’’-ビス{(トリフェニレン-2-イル)-フェニルアミノ}-1,1’;4’,1’’-ターフェニルの合成;
合成例6において、
4,4’’-ジブロモ-1,1’:3’,1’’-ターフェニル
に代えて
4,4’’-ジヨード-1,1’;4’,1’’-ターフェニル
を用い、
2-(フェニルアミノ)-9,9-ジメチル-9H-フルオレン
に代えて
N-(トリフェニレン-2-イル)アニリン
を用い、同様の条件で反応を行った。その結果、4,4’’-ビス{(トリフェニレン-2-イル)-フェニルアミノ}-1,1’;4’,1’’-ターフェニル(化合物1-88)の白色粉体11.4g(収率74%)を得た。
δ(ppm)=8.72-8.62(8H)
8.45(2H)
8.36(2H)
7.75(4H)
7.70-7.21(26H)
7.09(2H)
4-{(ビフェニル-4-イル)-フェニルアミノ}-4’’-[{4-(1-フェニル-インドール-4-イル)フェニル}-フェニルアミノ]-1,1’;4’,1’’-ターフェニルの合成;
合成例1において、
N-(ビフェニル-4-イル)-N-(4-ブロモフェニル)アニリ
ン
に代えて
N-(4’-ブロモ-1,1’-ビフェニル-4-イル)-{4-(
1-フェニル-インドール-4-イル)フェニル}アニリン
を用い、
N-(9,9-ジメチル-9H-フルオレン-2-イル)-N-{3
’-(4,4,5,5-テトラメチル-[1,3,2]ジオキサボラン
-2-イル)ビフェニル-4-イル}アニリン
に代えて
N-{4-(4,4,5,5-テトラメチル-1,3,2-ジオキサ
ボロラン-2-イル)フェニル}-(1,1’-ビフェニル-4-イル
)アニリン
を用い、同様の条件で反応を行った。その結果、4-{(ビフェニル-4-イル)-フェニルアミノ}-4’’-[{4-(1-フェニル-インドール-4-イル)フェニル}-フェニルアミノ]-1,1’;4’,1’’-ターフェニル(化合物1-91)の淡黄色粉体6.80g(収率67%)を得た。
δ(ppm)=7.70(4H)
7.68-7.50(16H)
7.42-7.11(23H)
7.05(1H)
6.88(1H)
4,4’’-ビス{N-フェニル-N-(2-フェニルビフェニル-4-イル)アミノ}-1,1’;4’,1’’-ターフェニルの合成;
窒素置換した反応容器に、
4,4’’-ジヨード-1,1’;4’,1’’-ターフェニル
13.0g、
N-(2-フェニルビフェニル-4-イル)アニリン
20.0g、
銅粉 0.18g、
炭酸カリウム 11.3g、
3,5-ジ-tert-ブチルサリチル酸 0.7g、
亜硫酸水素ナトリウム 0.86gおよび
ドデシルベンゼン 30ml
を加えて加熱し、210℃で24時間撹拌し、混合液を調整した。かかる混合液を冷却した後、キシレン30mlおよびメタノール60mlを加え、ろ過によって析出物を採取した。析出物にトルエン250mlおよびシリカ20gを加え、90℃まで加熱し、析出物溶解液を調整した。次いで、析出物溶解液から熱ろ過によって不溶物を除去し、その後、析出物溶解液を濃縮した。次いで、析出物濃縮液に酢酸エチルおよびメタノールを加えることによって析出する粗製物をろ過によって採取した。得られた粗製物について、クロロベンゼンを用いての再結晶を行い、続いて、メタノールを用いた還流洗浄操作を行った。その結果、4,4’’-ビス{N-フェニル-N-(2-フェニルビフェニル-4-イル)アミノ}-1,1’;4’,1’’-ターフェニル(化合物1-101)の白色粉体16.9g(収率72%)を得た。
δ(ppm)=7.68(4H)
7.62-7.55(4H)
7.39-7.06(40H)
4,4’’-ビス{(2-フェニルビフェニル-4-イル)-フェニルアミノ}-1,1’;2’,1’’-ターフェニルの合成;
合成例6において、
4,4’’-ジブロモ-1,1’:3’,1’’-ターフェニル
に代えて
4,4’’-ジブロモ-1,1’;2’,1’’-ターフェニル
を用い、
2-(フェニルアミノ)-9,9-ジメチル-9H-フルオレン
に代えて
N-(2-フェニルビフェニル-4-イル)アニリン
を用い、同様の条件で反応を行った。その結果、4,4’’-ビス{(2-フェニルビフェニル-4-イル)-フェニルアミノ}-1,1’;2’,1’’-ターフェニル(化合物1-103)の白色粉体4.3g(収率42%)を得た。
δ(ppm)=7.50-7.39(4H)
7.31-6.97(44H)
4,4’’-ビス{(2-フェニルビフェニル-4-イル)-フェニルアミノ}-1,1’;3’,1’’-ターフェニルの合成;
合成例6において、
2-(フェニルアミノ)-9,9-ジメチル-9H-フルオレン
に代えて
N-(2-フェニルビフェニル-4-イル)アニリン
を用い、同様の条件で反応を行った。その結果、4,4’’-ビス{(2-フェニルビフェニル-4-イル)-フェニルアミノ}-1,1’;3’,1’’-ターフェニル(化合物1-104)の白色粉体7.7g(収率53%)を得た。
δ(ppm)=7.81(2H)
7.61-7.48(14H)
7.39-7.06(32H)
ガラス転移点
合成例1の化合物(化合物1-5) 117℃
合成例2の化合物(化合物1-6) 117℃
合成例3の化合物(化合物1-21) 103℃
合成例5の化合物(化合物1-32) 115℃
合成例6の化合物(化合物1-34) 124℃
合成例7の化合物(化合物1-37) 114℃
合成例8の化合物(化合物1-38) 119℃
合成例9の化合物(化合物1-39) 106℃
合成例10の化合物(化合物1-41) 127℃
合成例11の化合物(化合物1-42) 111℃
合成例12の化合物(化合物1-45) 122℃
合成例13の化合物(化合物1-47) 116℃
合成例14の化合物(化合物1-49) 117℃
合成例15の化合物(化合物1-88) 163℃
合成例16の化合物(化合物1-91) 125℃
合成例17の化合物(化合物1-101) 124℃
合成例18の化合物(化合物1-103) 115℃
合成例19の化合物(化合物1-104) 122℃
仕事関数
合成例1の化合物(化合物1-5) 5.68eV
合成例2の化合物(化合物1-6) 5.65eV
合成例3の化合物(化合物1-21) 5.79eV
合成例4の化合物(化合物1-22) 5.83eV
合成例5の化合物(化合物1-32) 5.69eV
合成例6の化合物(化合物1-34) 5.65eV
合成例7の化合物(化合物1-37) 5.67eV
合成例8の化合物(化合物1-38) 5.64eV
合成例9の化合物(化合物1-39) 5.66eV
合成例10の化合物(化合物1-41) 5.69eV
合成例11の化合物(化合物1-42) 5.75eV
合成例12の化合物(化合物1-45) 5.76eV
合成例13の化合物(化合物1-47) 5.72eV
合成例14の化合物(化合物1-49) 5.72eV
合成例15の化合物(化合物1-88) 5.62eV
合成例16の化合物(化合物1-91) 5.67eV
合成例17の化合物(化合物1-101) 5.67eV
合成例18の化合物(化合物1-103) 5.75eV
合成例19の化合物(化合物1-104) 5.76eV
7,7-ジメチル-12-(4-フェニルキナゾリン-2-イル)-7,12-ジヒドロベンゾ[4,5]チエノ[3,2-g]インデノ[1,2-b]インドールの合成;
窒素置換した反応容器に、
7,7-ジメチル-7,12-ジヒドロベンゾ[4,5]チエノ[3
,2-g]インデノ[1,2-b]インドール 4.9g、
2-クロロ-4-フェニルキナゾリン 5.7g、
トリス(ジベンジリデンアセトン)ジパラジウム 0.3g、
トリ-tert-ブチルホスホニウムテトラフルオロボレート
0.4g、
tert-ブトキシナトリウム 4.0gおよび
キシレン 74ml
を加えて加熱し、12時間還流撹拌して混合液を調整した。かかる混合液を室温まで冷却した後、酢酸エチルおよび水を加え、分液操作によって有機層を採取した。有機層を濃縮し、カラムクロマトグラフによる精製を行った。その結果、7,7-ジメチル-12-(4-フェニルキナゾリン-2-イル)-7,12-ジヒドロベンゾ[4,5]チエノ[3,2-g]インデノ[1,2-b]インドール(化合物2-1)の粉体3.0g(収率38%)を得た。
7,7-ジメチル-12-(4-フェニルベンゾ[h]キナゾリン-2-イル)-7,12-ジヒドロベンゾ[4,5]チエノ[3,2-g]インデノ[1,2-b]インドールの合成;
合成例20において、
2-クロロ-4-フェニルキナゾリン
に代えて
2-クロロ-4-フェニルベンゾ[h]キナゾリン
を用い、同様の条件で反応を行った。その結果、7,7-ジメチル-12-(4-フェニルベンゾ[h]キナゾリン-2-イル)-7,12-ジヒドロベンゾ[4,5]チエノ[3,2-g]インデノ[1,2-b]インドール(化合物2-2)の粉体3.2g(収率38%)を得た。
12-(4,7-ジフェニルキナゾリン-2-イル)-7,7-ジメチル-7,12-ジヒドロベンゾ[4,5]チエノ[3,2-g]インデノ[1,2-b]インドールの合成;
合成例20において、
2-クロロ-4-フェニルキナゾリン
に代えて
2-クロロ-4,7-ジフェニルキナゾリン
を用い、同様の条件で反応を行った。その結果、12-(4,7-ジフェニルキナゾリン-2-イル)-7,7-ジメチル-7,12-ジヒドロベンゾ[4,5]チエノ[3,2-g]インデノ[1,2-b]インドール(化合物2-3)の粉体3.3g(収率38%)を得た。
12-(4,6-ジフェニルキナゾリン-2-イル)-7,7-ジメチル-7,12-ジヒドロベンゾ[4,5]チエノ[3,2-g]インデノ[1,2-b]インドールの合成;
合成例20において、
2-クロロ-4-フェニルキナゾリン
に代えて
2-クロロ-4,6-ジフェニルキナゾリン
を用い、同様の条件で反応を行った。その結果、12-(4,6-ジフェニルキナゾリン-2-イル)-7,7-ジメチル-7,12-ジヒドロベンゾ[4,5]チエノ[3,2-g]インデノ[1,2-b]インドール(化合物2-4)の粉体3.3g(収率38%)を得た。
13,13-ジメチル-8-(4-フェニルキナゾリン-2-イル)-8,13-ジヒドロベンゾ[4,5]チエノ[3,2-e]インデノ[1,2-b]インドール;
合成例20において、
7,7-ジメチル-7,12-ジヒドロベンゾ[4,5]チエノ[3
,2-g]インデノ[1,2-b]インドール
に代えて
13,13-ジメチル-8,13-ジヒドロベンゾ[4,5]チエノ
[3,2-e]インデノ[1,2-b]インドール
を用い、同様の条件で反応を行った。その結果、13,13-ジメチル-8-(4-フェニルキナゾリン-2-イル)-8,13-ジヒドロベンゾ[4,5]チエノ[3,2-e]インデノ[1,2-b]インドール(化合物2-5)の粉体3.0g(収率38%)を得た。
8-(4,6-ジフェニルキナゾリン-2-イル)-13,13-ジメチル-8,13-ジヒドロベンゾ[4,5]チエノ[3,2-e]インデノ[1,2-b]インドールの合成;
合成例24において、
2-クロロ-4-フェニルキナゾリン
に代えて
2-クロロ-4,6-ジフェニルキナゾリン
を用い、同様の条件で反応を行った。その結果、8-(4,6-ジフェニルキナゾリン-2-イル)-13,13-ジメチル-8,13-ジヒドロベンゾ[4,5]チエノ[3,2-e]インデノ[1,2-b]インドール(化合物2-6)の粉体3.3g(収率38%)を得た。
7,7,13,13-テトラメチル-5-(4-フェニルキナゾリン-2-イル)-7,13-ジヒドロ-5H-ジインデノ[1,2-b:1’,2’-f]インドールの合成;
合成例20において、
7,7-ジメチル-7,12-ジヒドロベンゾ[4,5]チエノ[3
,2-g]インデノ[1,2-b]インドール
に代えて
7,7,13,13-テトラメチル-7,13-ジヒドロ-5H-ジ
インデノ[1,2-b:1’,2’-f]インドール
を用い、同様の条件で反応を行った。その結果、7,7,13,13-テトラメチル-5-(4-フェニルキナゾリン-2-イル)-7,13-ジヒドロ-5H-ジインデノ[1,2-b:1’,2’-f]インドール(化合物2-7)の粉体3.0g(収率38%)を得た。
7,7,13,13-テトラメチル-5-[3-(4-フェニルキナゾリン-2-イル)フェニル]-7,13-ジヒドロ-5H-ジインデノ[1,2-b:1’,2’-f]インドールの合成;
合成例26において、
2-クロロ-4-フェニルキナゾリン
に代えて
2-(3-ブロモフェニル)-4-フェニルキナゾリン
を用い、同様の条件で反応を行った。その結果、7,7,13,13-テトラメチル-5-[3-(4-フェニルキナゾリン-2-イル)フェニル]-7,13-ジヒドロ-5H-ジインデノ[1,2-b:1’,2’-f]インドール(化合物2-8)の粉体3.4g(収率38%)を得た。
7,7-ジメチル-12-(4-フェニルベンゾ[h]キナゾリン-2-イル)-7,12-ジヒドロベンゾフロ[3,2-g]インデノ[1,2-b]インドールの合成;
合成例21において、
7,7-ジメチル-7,12-ジヒドロベンゾ[4,5]チエノ[3
,2-g]インデノ[1,2-b]インドール
に代えて
7,7-ジメチル-7,12-ジヒドロベンゾフロ[3,2-g]イ
ンデノ[1,2-b]インドール
を用い、同様の条件で反応を行った。その結果、7,7-ジメチル-12-(4-フェニルベンゾ[h]キナゾリン-2-イル)-7,12-ジヒドロベンゾフロ[3,2-g]インデノ[1,2-b]インドール(化合物2-9)の粉体3.0g(収率38%)を得た。
12-(4,6-ジフェニルベンゾ[h]キナゾリン-2-イル)-7,7-ジメチル-7,12-ジヒドロベンゾフロ[3,2-g]インデノ[1,2-b]インドールの合成;
合成例28において、
2-クロロ-4-フェニルベンゾ[h]キナゾリン
に代えて
2-クロロ-4,6-ジフェニルベンゾ[h]キナゾリン
を用い、同様の条件で反応を行った。その結果、12-(4,6-ジフェニルベンゾ[h]キナゾリン-2-イル)-7,7-ジメチル-7,12-ジヒドロベンゾフロ[3,2-g]インデノ[1,2-b]インドール(化合物2-10)の粉体3.5g(収率38%)を得た。
13,13-ジメチル-8-(4-フェニルキナゾリン-2-イル)-8,13-ジヒドロベンゾフロ[3,2-e]インデノ[1,2-b]インドールの合成;
合成例20において、
7,7-ジメチル-7,12-ジヒドロベンゾ[4,5]チエノ[3
,2-g]インデノ[1,2-b]インドール
に代えて
13,13-ジメチル-8,13-ジヒドロベンゾフロ[3,2-e
]インデノ[1,2-b]インドール
を用い、同様の条件で反応を行った。その結果、13,13-ジメチル-8-(4-フェニルキナゾリン-2-イル)-8,13-ジヒドロベンゾフロ[3,2-e]インデノ[1,2-b]インドール(化合物2-11)の粉体3.0g(収率38%)を得た。
13,13-ジメチル-8-(4,6-ジフェニルキナゾリン-2-イル)-8,13-ジヒドロベンゾフロ[3,2-e]インデノ[1,2-b]インドールの合成;
合成例30において、
2-クロロ-4-フェニルキナゾリン
に代えて
2-クロロ-4,6-ジフェニルキナゾリン
を用い、同様の条件で反応を行った。その結果、13,13-ジメチル-8-(4,6-ジフェニルキナゾリン-2-イル)-8,13-ジヒドロベンゾフロ[3,2-e]インデノ[1,2-b]インドール(化合物2-12)の粉体3.2g(収率38%)を得た。
13-(4,6-ジフェニルキナゾリン-2-イル)-7,7-ジメチル-7,13-ジヒドロインデノ[2’,1’:4,5]チエノ[2,3-a]カルバゾールの合成;
合成例31において、
13,13-ジメチル-8,13-ジヒドロベンゾフロ[3,2-e
]インデノ[1,2-b]インドール
に代えて
7,7-ジメチル-7,13-ジヒドロインデノ[2’,1’:4,
5]チエノ[2,3-a]カルバゾール
を用い、同様の条件で反応を行った。その結果、13-(4,6-ジフェニルキナゾリン-2-イル)-7,7-ジメチル-7,13-ジヒドロインデノ[2’,1’:4,5]チエノ[2,3-a]カルバゾール(化合物3-1)の粉体7.0g(収率38%)を得た。
13-[4-(ビフェニル-4-イル)キナゾリン-2-イル]-7,7-ジメチル-7,13-ジヒドロインデノ[2’,1’:4,5]チエノ[2,3-a]カルバゾールの合成;
合成例32において、
2-クロロ-4,6-ジフェニルキナゾリン
に代えて
4-(ビフェニル-4-イル)-2-クロロキナゾリン
を用い、同様の条件で反応を行った。その結果、13-[4-(ビフェニル-4-イル)キナゾリン-2-イル]-7,7-ジメチル-7,13-ジヒドロインデノ[2’,1’:4,5]チエノ[2,3-a]カルバゾール(化合物3-2)の粉体6.7g(収率37%)を得た。
7,7-ジメチル-13-[4-(フェニル-d5)キナゾリン-2-イル]-7,13-ジヒドロインデノ[2’,1’:4,5]チエノ[2,3-a]カルバゾールの合成;
合成例32において、
2-クロロ-4,6-ジフェニルキナゾリン
に代えて
2-クロロ-4-(フェニル-d5)キナゾリン
を用い、同様の条件で反応を行った。その結果、7,7-ジメチル-13-[4-(フェニル-d5)キナゾリン-2-イル]-7,13-ジヒドロインデノ[2’,1’:4,5]チエノ[2,3-a]カルバゾール(化合物3-3)の粉体8.4g(収率32%)を得た。
7,7-ジメチル-13-[4-(4-フェニルキナゾリン-2-イル)フェニル]-7,13-ジヒドロインデノ[2’,1’:4,5]チエノ[2,3-a]カルバゾールの合成;
合成例32において、
2-クロロ-4,6-ジフェニルキナゾリン
に代えて
2-(4-ブロモフェニル)-4-フェニルキナゾリン
を用い、同様の条件で反応を行った。その結果、7,7-ジメチル-13-[4-(4-フェニルキナゾリン-2-イル)フェニル]-7,13-ジヒドロインデノ[2’,1’:4,5]チエノ[2,3-a]カルバゾール(化合物3-4)の粉体5.2g(収率28%)を得た。
7,7-ジメチル-13-[3-(4-フェニルキナゾリン-2-イル)フェニル]-7,13-ジヒドロインデノ[2’,1’:4,5]チエノ[2,3-a]カルバゾールの合成;
合成例32において、
2-クロロ-4,6-ジフェニルキナゾリン
に代えて
2-(3-ブロモフェニル)-4-フェニルキナゾリン
を用い、同様の条件で反応を行った。その結果、7,7-ジメチル-13-[3-(4-フェニルキナゾリン-2-イル)フェニル]-7,13-ジヒドロインデノ[2’,1’:4,5]チエノ[2,3-a]カルバゾール(化合物3-5)の粉体8.4g(収率32%)を得た。
7,7-ジメチル-13-(4-フェニルベンゾ[h]キナゾリン-2-イル)-7,13-ジヒドロインデノ[2’,1’:4,5]チエノ[2,3-a]カルバゾールの合成;
合成例32において、
2-クロロ-4,6-ジフェニルキナゾリン
に代えて
2-クロロ-4-フェニルベンゾ[h]キナゾリン
を用い、同様の条件で反応を行った。その結果、7,7-ジメチル-13-(4-フェニルベンゾ[h]キナゾリン-2-イル)-7,13-ジヒドロインデノ[2’,1’:4,5]チエノ[2,3-a]カルバゾール(化合物3-6)の粉体8.4g(収率32%)を得た。
8,8-ジメチル-5-(4-フェニルベンゾ[h]キナゾリン-2-イル)-5,8-ジヒドロインデノ[2’,1’:4,5]チエノ[3,2-c]カルバゾールの合成;
合成例37において、
7,7-ジメチル-7,13-ジヒドロインデノ[2’,1’:4,
5]チエノ[2,3-a]カルバゾール
に代えて
8,8-ジメチル-5,8-ジヒドロインデノ[2’,1’:4,5
]チエノ[3,2-c]カルバゾール
を用い、同様の条件で反応を行った。その結果、8,8-ジメチル-5-(4-フェニルベンゾ[h]キナゾリン-2-イル)-5,8-ジヒドロインデノ[2’,1’:4,5]チエノ[3,2-c]カルバゾール(化合物3-7)の粉体9.3g(収率35%)を得た。
7,7-ジメチル-13-(4-フェニルキナゾリン-2-イル)-7,13-ジヒドロインデノ[2’,1’:4,5]フロ[2,3-a]カルバゾールの合成;
合成例20において、
7,7-ジメチル-7,12-ジヒドロベンゾ[4,5]チエノ[3
,2-g]インデノ[1,2-b]インドール
に代えて
7,7-ジメチル-7,13-ジヒドロインデノ[2’,1’:4,
5]フロ[2,3-a]カルバゾール
を用い、同様の条件で反応を行った。その結果、7,7-ジメチル-13-(4-フェニルキナゾリン-2-イル)-7,13-ジヒドロインデノ[2’,1’:4,5]フロ[2,3-a]カルバゾール(化合物3-8)の粉体6.2g(収率32%)を得た。
7,7-ジメチル-13-(4-フェニルベンゾ[h]キナゾリン-2-イル)-7,13-ジヒドロインデノ[2’,1’:4,5]フロ[2,3-a]カルバゾールの合成
合成例39において、
2-クロロ-4-フェニルキナゾリン
に代えて
2-クロロ-4-フェニルベンゾ[h]キナゾリン
を用い、同様の条件で反応を行った。その結果、7,7-ジメチル-13-(4-フェニルベンゾ[h]キナゾリン-2-イル)-7,13-ジヒドロインデノ[2’,1’:4,5]フロ[2,3-a]カルバゾール(化合物3-9)の粉体8.6g(収率30%)を得た。
13-(4,6-ジフェニルキナゾリン-2-イル)-7,7-ジメチル-7,13-ジヒドロインデノ[2’,1’:4,5]フロ[2,3-a]カルバゾールの合成;
合成例39において、
2-クロロ-4-フェニルキナゾリン
に代えて
2-クロロ-4,6-ジフェニルキナゾリン
を用い、同様の条件で反応を行った。その結果、13-(4,6-ジフェニルキナゾリン-2-イル)-7,7-ジメチル-7,13-ジヒドロインデノ[2’,1’:4,5]フロ[2,3-a]カルバゾール(化合物3-10)の粉体7.2g(収率29%)を得た。
7,7-ジフェニル-13-(4-フェニルキナゾリン-2-イル)-7,13-ジヒドロインデノ[2’,1’:4,5]チエノ[2,3-a]カルバゾールの合成;
合成例20において、
7,7-ジメチル-7,12-ジヒドロベンゾ[4,5]チエノ[3
,2-g]インデノ[1,2-b]インドール
に代えて
7,7-ジフェニル-7,13-ジヒドロインデノ[2’,1’:4
,5]チエノ[2,3-a]カルバゾール
を用い、同様の条件で反応を行った。その結果、7,7-ジフェニル-13-(4-フェニルキナゾリン-2-イル)-7,13-ジヒドロインデノ[2’,1’:4,5]チエノ[2,3-a]カルバゾール(化合物3-11)の粉体6.7g(収率37%)を得た。
9,9-ジメチル-15-(4-フェニルキナゾリン-2-イル)-9,15-ジヒドロベンゾ[a]インデノ[2’,1’:4,5]チエノ[3,2-i]カルバゾールの合成;
合成例20において、
7,7-ジメチル-7,12-ジヒドロベンゾ[4,5]チエノ[3
,2-g]インデノ[1,2-b]インドール
に代えて
9,9-ジメチル-9,15-ジヒドロベンゾ[a]インデノ[2’
,1’:4,5]チエノ[3,2-i]カルバゾール
を用い、同様の条件で反応を行った。その結果、9,9-ジメチル-15-(4-フェニルキナゾリン-2-イル)-9,15-ジヒドロベンゾ[a]インデノ[2’,1’:4,5]チエノ[3,2-i]カルバゾール(化合物3-12)の粉体4.8g(収率42%)を得た。
7-フェニル-13-(4-フェニルキナゾリン-2-イル)-7,13-ジヒドロインドロ[2’,3’:4,5]チエノ[2,3-a]カルバゾールの合成;
合成例20において、
7,7-ジメチル-7,12-ジヒドロベンゾ[4,5]チエノ[3
,2-g]インデノ[1,2-b]インドール
に代えて
7-フェニル-7,13-ジヒドロインドロ[2’,3’:4,5]
チエノ[2,3-a]カルバゾール
を用い、同様の条件で反応を行った。その結果、7-フェニル-13-(4-フェニルキナゾリン-2-イル)-7,13-ジヒドロインドロ[2’,3’:4,5]チエノ[2,3-a]カルバゾール(化合物3-13)の粉体4.3g(収率43%)を得た。
12,12-ジメチル-1-(4-フェニルキナゾリン-2-イル)-1,12-ジヒドロインデノ[1’,2’:4,5]チエノ[2,3-a]カルバゾールの合成;
合成例20において、
7,7-ジメチル-7,12-ジヒドロベンゾ[4,5]チエノ[3
,2-g]インデノ[1,2-b]インドール
に代えて
12,12-ジメチル-1,12-ジヒドロインデノ[1’,2’:
4,5]チエノ[2,3-a]カルバゾール
を用い、同様の条件で反応を行った。その結果、12,12-ジメチル-1-(4-フェニルキナゾリン-2-イル)-1,12-ジヒドロインデノ[1’,2’:4,5]チエノ[2,3-a]カルバゾール(化合物3-14)の粉体6.3g(収率44%)を得た。
7,7-ジメチル-13-(ナフタレン-2-イル)-7,13-ジヒドロインデノ[2’,1’:4,5]チエノ[2,3-a]カルバゾールの合成;
合成例32において、
2-クロロ-4,6-ジフェニルキナゾリン
に代えて
2-ブロモナフタレン
を用い、同様の条件で反応を行った。その結果、7,7-ジメチル-13-(ナフタレン-2-イル)-7,13-ジヒドロインデノ[2’,1’:4,5]チエノ[2,3-a]カルバゾール(化合物3-15)の粉体5.4g(収率47%)を得た。
図1に示すように、ガラス基板1上に透明陽極2としてITO電極をあらかじめ形成したものの上に、正孔注入層3、第一正孔輸送層5a、第二正孔輸送層5b、発光層6、電子輸送層7、電子注入層8、陰極(アルミニウム電極)9の順に蒸着して有機EL素子を作製した。
続いて正孔注入層3を形成した。具体的には、透明陽極2を覆うように、下記構造式のHIM-1を蒸着し、膜厚5nmの正孔注入層3を形成した。
最後に、アルミニウムを100nm蒸着して陰極9を形成した。
作製した有機EL素子について、大気中、常温で直流電圧を印加したときの発光特性を測定した。層構成を表1に示し、測定結果を表2に示した。
実施例1において、第二正孔輸送層5bの材料として合成例1の化合物1-5に代えて合成例6の化合物1-34を用いた以外は、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、常温で直流電圧を印加したときの発光特性を測定した。層構成を表1に示し、測定結果を表2に示した。
実施例1において、電子輸送層7の材料としてピリミジン誘導体4-123に代えて下記構造式のピリミジン誘導体4-125を用いた以外は、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、常温で直流電圧を印加したときの発光特性を測定した。層構成を表1に示し、測定結果を表2に示した。
実施例3において、第二正孔輸送層5bの材料として合成例1の化合物1-5に代えて合成例6の化合物1-34を用いた以外は、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、常温で直流電圧を印加したときの発光特性を測定した。層構成を表1に示し、測定結果を表2に示した。
実施例1において、発光層6の材料として合成例23の化合物2-4に代えて合成例45の化合物3-14を用いた以外は、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、常温で直流電圧を印加したときの発光特性を測定した。層構成を表1に示し、測定結果を表2に示した。
実施例5において、第二正孔輸送層5bの材料として合成例1の化合物1-5に代えて合成例6の化合物1-34を用いた以外は、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、常温で直流電圧を印加したときの発光特性を測定した。層構成を表1に示し、測定結果を表2に示した。
実施例5において、電子輸送層7の材料としてピリミジン誘導体4-123に代えてピリミジン誘導体4-125を用いた以外は、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、常温で直流電圧を印加したときの発光特性を測定した。層構成を表1に示し、測定結果を表2に示した。
実施例7において、第二正孔輸送層5bの材料として合成例1の化合物1-5に代えて合成例6の化合物1-34を用いた以外は、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、常温で直流電圧を印加したときの発光特性を測定した。層構成を表1に示し、測定結果を表2に示した。
実施例1において、発光層6の材料として合成例23の化合物2-4に代えて下記構造式のカルバゾール誘導体3-16を用いた以外は、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、常温で直流電圧を印加したときの発光特性を測定した。層構成を表1に示し、測定結果を表2に示した。
実施例9において、第二正孔輸送層5bの材料として合成例1の化合物1-5に代えて合成例6の化合物1-34を用いた以外は、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、常温で直流電圧を印加したときの発光特性を測定した。層構成を表1に示し、測定結果を表2に示した。
実施例9において、電子輸送層7の材料としてピリミジン誘導体4-123に代えてピリミジン誘導体4-125を用いた以外は、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、常温で直流電圧を印加したときの発光特性を測定した。層構成を表1に示し、測定結果を表2に示した。
実施例11において、第二正孔輸送層5bの材料として合成例1の化合物1-5に代えて合成例6の化合物1-34を用いた以外は、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、常温で直流電圧を印加したときの発光特性を測定した。層構成を表1に示し、測定結果を表2に示した。
実施例3において、第一正孔輸送層5aの材料として化合物6-1に代えて下記構造式で表されるトリアリールアミン化合物6’-2を用い、更に、第二正孔輸送層5bの材料として合成例1の化合物1-5に代えて下記構造式で表されるトリアリールアミン化合物6’-2を用いた以外は、同様の条件で有機EL素子を作製した。この場合、第一正孔輸送層5aと第二正孔輸送層5bは一体の正孔輸送層(膜厚65nm)として機能した。構造式から明らかな通り、化合物(6’-2)は、その分子中にトリアリールアミン構造を2個有するトリアリールアミン化合物であった。作製した有機EL素子について、大気中、常温で直流電圧を印加したときの発光特性を測定した。層構成を表1に示し、測定結果を表2に示した。
実施例7において、第一正孔輸送層5aの材料として化合物6-1に代えて前記構造式で表されるトリアリールアミン化合物6’-2を用い、第二正孔輸送層5bの材料として合成例1の化合物1-5に代えて前記構造式で表されるトリアリールアミン化合物6’-2を用いた以外は、同様の条件で有機EL素子を作製した。この場合、第一正孔輸送層5aと第二正孔輸送層5bは一体の正孔輸送層(膜厚65nm)として機能した。作製した有機EL素子について、大気中、常温で直流電圧を印加したときの発光特性を測定した。層構成を表1に示し、測定結果を表2に示した。
実施例11において、第一正孔輸送層5aの材料として化合物6-1に代えて前記構造式で表されるトリアリールアミン化合物6’-2を用い、更に、第二正孔輸送層5bの材料として合成例1の化合物1-5に代えて前記構造式で表されるトリアリールアミン化合物6’-2を用いた以外は、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、常温で直流電圧を印加したときの発光特性を測定した。層構成を表1に示し、測定結果を表2に示した。
2 透明陽極
3 正孔注入層
5 正孔輸送層
5a 第一正孔輸送層
5b 第二正孔輸送層
6 発光層
7 電子輸送層
8 電子注入層
9 陰極
Claims (9)
- 少なくとも陽極、正孔輸送層、発光層、電子輸送層および陰極をこの順で有する有機エレクトロルミネッセンス素子において、
前記正孔輸送層が、下記一般式(1)で表されるアリールアミン化合物を含有し、
前記発光層が、下記一般式(2)で表されるインデノインドール誘導体または下記一般式(3)で表されるカルバゾール誘導体を含有することを特徴とする有機エレクトロルミネッセンス素子。
Ar1~Ar4は、それぞれ、芳香族炭化水素基、芳香族複素
環基または縮合多環芳香族基を表す。
A1は、芳香族炭化水素の2価基、芳香族複素環の2価基、縮
合多環芳香族の2価基または単結合を表し、
Ar5は、芳香族炭化水素基、芳香族複素環基または縮合多環
芳香族基を表し、
R1~R8は、それぞれ、水素原子;重水素原子;フッ素原子
;塩素原子;シアノ基;ニトロ基;炭素原子数1~6のアルキル
基;炭素原子数5~10のシクロアルキル基;炭素原子数2~6
のアルケニル基;炭素原子数1~6のアルキルオキシ基;炭素原
子数5~10のシクロアルキルオキシ基;芳香族炭化水素基;芳
香族複素環基;縮合多環芳香族基;アリールオキシ基;または置
換基として芳香族炭化水素基、芳香族複素環基もしくは縮合多環
芳香族基を有するジ置換アミノ基;であり、
R1~R4は、単結合、置換もしくは無置換のメチレン基、酸
素原子または硫黄原子を介して互いに結合して環を形成してもよ
く、
R5~R8は、単結合、置換もしくは無置換のメチレン基、酸
素原子または硫黄原子を介して互いに結合して環を形成してもよ
く、
R1~R4の一部が脱離し、この脱離により生じた空位に、R1
~R4の他の基が、置換もしくは無置換のメチレン基、酸素原子
、硫黄原子またはモノアリールアミノ基を介して結合して環を形
成してもよく、
R5~R8の一部が脱離し、この脱離により生じた空位に、R5
~R8の他の基が、置換もしくは無置換のメチレン基、酸素原子
、硫黄原子またはモノアリールアミノ基を介して結合して環を形
成してもよい。
R9とR10は、それぞれ、炭素原子数1~6のアルキル基、芳
香族炭化水素基、芳香族複素環基または縮合多環芳香族基であり
、R9とR10は、単結合、置換もしくは無置換のメチレン基、酸
素原子または硫黄原子を介して互いに結合して環を形成してもよ
い。
A2は、芳香族炭化水素の2価基、芳香族複素環の2価基、縮
合多環芳香族の2価基または単結合を表し、
Ar6は、芳香族炭化水素基、芳香族複素環基または縮合多環
芳香族基を表し、
R11~R18は、それぞれ、水素原子;重水素原子;フッ素原
子;塩素原子;シアノ基;ニトロ基;炭素原子数1~6のアルキ
ル基;炭素原子数5~10のシクロアルキル基;炭素原子数2~
6のアルケニル基;炭素原子数1~6のアルキルオキシ基;炭素
原子数5~10のシクロアルキルオキシ基;芳香族炭化水素基;
芳香族複素環基;縮合多環芳香族基;アリールオキシ基;または
置換基として芳香族炭化水素基、芳香族複素環基もしくは縮合多
環芳香族基を有するジ置換アミノ基;であり、
R11~R14は、単結合、置換もしくは無置換のメチレン基、
酸素原子または硫黄原子を介して互いに結合して環を形成しても
よく、
R15~R18は、単結合、置換もしくは無置換のメチレン基、
酸素原子または硫黄原子を介して互いに結合して環を形成しても
よく、
R11~R14の一部が脱離し、この脱離により生じた空位に、
R11~R14の他の基が、置換もしくは無置換のメチレン基、酸
素原子、硫黄原子またはモノアリールアミノ基を介して結合して
環を形成してもよく、
R15~R18の一部が脱離し、この脱離により生じた空位に、
R15~R18の他の基が、置換もしくは無置換のメチレン基、酸
素原子、硫黄原子またはモノアリールアミノ基を介して結合して
環を形成してもよい。 - 前記電子輸送層が、下記一般式(4)で表されるピリミジン誘導体を含有する、請求項1記載の有機エレクトロルミネッセンス素子。
Ar7は、芳香族炭化水素基、芳香族複素環基または縮合多環
芳香族基を表し、
Ar8、Ar9は、それぞれ、水素原子、芳香族炭化水素基、
芳香族複素環基または縮合多環芳香族基を表し、Ar8とA
r9は同時に水素原子となることはなく、
Bは、下記構造式(5)で示される1価基を表す。
Ar10は、芳香族複素環基を表し、
R19~R22は、それぞれ、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1~6のアルキル基、芳香族炭化水素基、芳香
族複素環基または縮合多環芳香族基を表し、
R19~R22とAr10は、単結合、置換もしくは無置換
のメチレン基、酸素原子または硫黄原子を介して互いに結
合して環を形成していてもよい。 - 前記正孔輸送層が、第一正孔輸送層および第二正孔輸送層の2層構造を有しており、該第二正孔輸送層が前記発光層側に位置しており且つ前記一般式(1)で表されるアリールアミン化合物を含有する、請求項1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、赤色の発光材料を含有する、請求項1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、燐光性の発光材料を含有する、請求項1記載の有機エレクトロルミネッセンス素子。
- 前記燐光性の発光材料が、イリジウムまたは白金を含む金属錯体である、請求項8記載の有機エレクトロルミネッセンス素子。
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