WO2017183625A1 - 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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- WO2017183625A1 WO2017183625A1 PCT/JP2017/015537 JP2017015537W WO2017183625A1 WO 2017183625 A1 WO2017183625 A1 WO 2017183625A1 JP 2017015537 W JP2017015537 W JP 2017015537W WO 2017183625 A1 WO2017183625 A1 WO 2017183625A1
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- 0 CN1Nc(c(*)c(*)c(*)c2*)c2N1 Chemical compound CN1Nc(c(*)c(*)c(*)c2*)c2N1 0.000 description 2
- JRAGBPIHECTEDS-UHFFFAOYSA-N c(cc1)ccc1-c1cc2n[n](-c(cc3)ccc3N(c(cc3)ccc3-c(cc3)ccc3N(c(cc3)ccc3-[n]3nc(cc(cc4)-c5ccccc5)c4n3)c3ccc(cccc4)c4c3)c3cc(cccc4)c4cc3)nc2cc1 Chemical compound c(cc1)ccc1-c1cc2n[n](-c(cc3)ccc3N(c(cc3)ccc3-c(cc3)ccc3N(c(cc3)ccc3-[n]3nc(cc(cc4)-c5ccccc5)c4n3)c3ccc(cccc4)c4c3)c3cc(cccc4)c4cc3)nc2cc1 JRAGBPIHECTEDS-UHFFFAOYSA-N 0.000 description 1
- BKJXCXQHDYAINY-UHFFFAOYSA-N c(cc1)ccc1N(c(cc1)ccc1-c(cc1)ccc1-c(cc1)ccc1N(c1ccccc1)c(cc1)ccc1-c(cc1)ccc1-[n]1nc(cccc2)c2n1)c(cc1)ccc1-c(cc1)ccc1-[n]1nc(cccc2)c2n1 Chemical compound c(cc1)ccc1N(c(cc1)ccc1-c(cc1)ccc1-c(cc1)ccc1N(c1ccccc1)c(cc1)ccc1-c(cc1)ccc1-[n]1nc(cccc2)c2n1)c(cc1)ccc1-c(cc1)ccc1-[n]1nc(cccc2)c2n1 BKJXCXQHDYAINY-UHFFFAOYSA-N 0.000 description 1
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- H10K85/636—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom
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Definitions
- the present invention relates to an organic electroluminescence element (hereinafter abbreviated as an organic EL element) which is a self-luminous element suitable for various display devices, and more particularly to an organic EL element using a specific arylamine compound.
- the present invention relates to an organic EL element having significantly improved light resistance.
- the organic EL element is a self-luminous element, it has been actively researched because it is brighter and more visible than a liquid crystal element and can be clearly displayed.
- a light emitting element having a top emission structure in which a metal having a high work function is used for an anode and light is emitted from the upper part has been used.
- a light emitting element having a bottom emission structure in which the area of the light emitting part is limited by the pixel circuit, a light emitting element having a top emission structure has an advantage that a wide light emitting part can be obtained.
- a semitransparent electrode such as LiF / Al / Ag (for example, see Non-Patent Document 2), Ca / Mg (for example, see Non-Patent Document 3), LiF / MgAg, or the like is used as a cathode.
- the effect of the capping layer in the light emitting device having the top emission structure is that a light emitting device using Ir (ppy) 3 as a light emitting material has a current efficiency of 38 cd / A when there is no capping layer.
- a light emitting device using Ir (ppy) 3 has a current efficiency of 38 cd / A when there is no capping layer.
- an efficiency improvement of about 1.7 times as 64 cd / A was recognized.
- the maximum point of transmittance and the maximum point of efficiency of the translucent electrode and the capping layer do not necessarily coincide with each other, and the maximum point of light extraction efficiency is determined by the interference effect. (For example, refer nonpatent literature 3).
- a metal mask with high definition for the formation of the capping layer, but such a metal mask has a problem that the alignment accuracy is deteriorated due to thermal distortion. That is, ZnSe has a high melting point of 1100 ° C. or higher (see, for example, Non-Patent Document 3), and cannot be deposited at an accurate position with a high-definition mask. Many inorganic substances have high deposition temperatures and are not suitable for use with high-definition masks, and may damage the light-emitting elements themselves. Further, in the film formation by the sputtering method, the light emitting element is damaged, and therefore a capping layer containing an inorganic material cannot be used.
- Alq 3 is a green light-emitting material or electron transport.
- organic EL material generally used as a material, it has weak absorption in the vicinity of 450 nm used for a blue light emitting element. Therefore, in the case of a blue light emitting element, there is a problem that both the color purity is lowered and the light extraction efficiency is lowered.
- the organic EL device In order to improve the device characteristics of the organic EL device, in particular, to absorb light of sunlight having a wavelength of 400 nm to 410 nm so as not to affect the material inside the device and to greatly improve the light extraction efficiency.
- a material for the capping layer a material having a high extinction coefficient, a high refractive index, and excellent thin film stability, durability, and light resistance is required.
- JP-A-8-048656 Japanese Patent No. 3194657 WO2013-038627
- An object of the present invention is to improve the device characteristics of an organic EL device, in particular, to absorb light having a wavelength of sunlight from 400 nm to 410 nm so as not to affect the material inside the device, and to improve the light extraction efficiency. Constructed from materials that have a high extinction coefficient, a high refractive index, excellent thin film stability, durability, and light resistance, as well as no absorption in the blue, green, and red wavelength regions for significant improvement An object of the present invention is to provide an organic EL device having a capping layer.
- the physical properties of the capping layer material suitable for the present invention are: (1) high extinction coefficient, (2) high refractive index, (3) vapor deposition is possible and no thermal decomposition, (4) It can be mentioned that the thin film state is stable and (5) the glass transition temperature is high.
- the physical characteristics of the element suitable for the present invention include (1) absorption of light from 400 nm to 410 nm, (2) high light extraction efficiency, and (3) no reduction in color purity. (4) Transmitting light without changing over time, (5) Long life.
- the present inventors pay attention to the fact that the arylamine-based material is excellent in the stability and durability of the thin film, and the concentration of a specific arylamine compound having a high refractive index is 10 ⁇ 5.
- the concentration of a specific arylamine compound having a high refractive index is 10 ⁇ 5.
- the following organic EL elements are provided.
- an organic electroluminescence device having at least an anode electrode, a hole transport layer, a light emitting layer, an electron transport layer, a cathode electrode, and a capping layer in this order, the extinction coefficient of the material of the capping layer is 0.000 at a wavelength of 400 nm to 410 nm.
- An organic electroluminescence device comprising a material having an absorbance of 0.2 or more at a wavelength of 400 nm to 410 nm in an absorption spectrum of 3 or more and a concentration of 10 ⁇ 5 mol / l.
- Ar 1 , Ar 2 , Ar 3 and Ar 4 may be the same or different from each other, and are substituted or unsubstituted aromatic hydrocarbon groups, substituted or unsubstituted aromatic heterocyclic groups, or substituted or Represents an unsubstituted condensed polycyclic aromatic group, and n represents an integer of 0 to 4.
- n represents an integer of 0 to 4.
- at least one of Ar 1 , Ar 2 , Ar 3 , and Ar 4 is represented by the following structural formula (B). Or a monovalent group as a substituent.
- R 1 , R 2 , R 3 and R 4 may be the same or different from each other, and may be a linking group, or a hydrogen atom, deuterium atom, fluorine atom, chlorine atom, cyano group, nitro group, substituent.
- Ar 5 represents a linking group, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed group.
- Ar 6 and Ar 7 may be the same as or different from each other, a linking group, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, Or A substituted or unsubstituted condensed polycyclic aromatic group, Y is an oxygen atom or a sulfur atom,, Y is assumed to no Ar 7, X and Y are nitrogen atom, Ar 5 , Ar 6 , Ar 7 is a linking group or a substituent, and when X is a nitrogen atom and Y is a carbon atom, X does not have Ar 6.
- Ar 8 is A substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group, provided that R 1 , R 2 , R 3 , R 4 , Ar 5 , Ar 6 , Ar 7 is a linking group, except that X is a nitrogen atom and Y is an oxygen atom or a sulfur atom.
- R 1 , R 2 , R 3 and R 4 may be the same or different from each other and have a hydrogen atom, deuterium atom, fluorine atom, chlorine atom, cyano group, nitro group or substituent.
- An optionally substituted linear or branched alkyl group having 1 to 6 carbon atoms, an optionally substituted cycloalkyl group having 5 to 10 carbon atoms, and an optionally substituted carbon A linear or branched alkenyl group having 2 to 6 atoms, an optionally substituted linear or branched alkyloxy group having 1 to 6 carbon atoms, or a substituent.
- R 1 , R 3 and R 4 may be the same or different from each other, and may have a hydrogen atom, deuterium atom, fluorine atom, chlorine atom, cyano group, nitro group or substituent.
- R 3 and R 4 is a single bond, a substituted or unsubstituted methylene group, an oxygen atom, through a sulfur atom or N-Ar 8 may be bonded to each other to form a ring .
- Ar 6, Ar 8 May be the same or different from each other, and each represents a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group.
- R 1 , R 2 , R 3 and R 4 may be the same or different from each other and have a hydrogen atom, deuterium atom, fluorine atom, chlorine atom, cyano group, nitro group or substituent.
- An optionally substituted linear or branched alkyl group having 1 to 6 carbon atoms, an optionally substituted cycloalkyl group having 5 to 10 carbon atoms, and an optionally substituted carbon A linear or branched alkenyl group having 2 to 6 atoms, an optionally substituted linear or branched alkyloxy group having 1 to 6 carbon atoms, or a substituent.
- R 1 , R 2 , R 3 and R 4 may be the same or different from each other and have a hydrogen atom, deuterium atom, fluorine atom, chlorine atom, cyano group, nitro group or substituent.
- An optionally substituted linear or branched alkyl group having 1 to 6 carbon atoms, an optionally substituted cycloalkyl group having 5 to 10 carbon atoms, and an optionally substituted carbon A linear or branched alkenyl group having 2 to 6 atoms, an optionally substituted linear or branched alkyloxy group having 1 to 6 carbon atoms, or a substituent.
- R 3 , R 4 , R 5 , R 6 , R 7 and R 8 may be the same or different from each other, and may be a linking group, or a hydrogen atom, deuterium atom, fluorine atom, chlorine atom, cyano group.
- Ar 8 to having no 6 represents a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group.
- R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , Ar 5 , Ar 6 , Ar 7 only one is a linking group, X is a nitrogen atom, and Y is an oxygen Except for atoms or sulfur atoms.
- any two of Ar 1 , Ar 2 , Ar 3 , Ar 4 are a monovalent group represented by the structural formula (B), or substituted for the monovalent group
- the organic EL device according to 1) which is a group.
- Ar 1 and Ar 4 are a monovalent group represented by the structural formula (B) or have the monovalent group as a substituent.
- the organic EL element of description is a monovalent group represented by the structural formula (B) or have the monovalent group as a substituent.
- aromatic hydrocarbon group aromatic heterocyclic group or “fused polycyclic aromatic group” in the “ring aromatic group”
- phenyl group, biphenylyl group, terphenylyl group, naphthyl group, anthracenyl group Group phenanthryl group, fluorenyl group, indenyl group, pyrenyl group, perylenyl group, fluoranthenyl group, triphenylenyl group, pyridyl group, furyl group, pyrrolyl group, thienyl group, quinolyl group, isoquinolyl group, benzofuranyl group, benzothienyl group, Indolyl group, carb
- Ar 1 and Ar 2 , or Ar 3 and Ar 4 may be bonded to each other via a single bond, a substituted or unsubstituted methylene group, an oxygen atom, a sulfur atom, or N—Ar 8 to form a ring.
- N in “N—Ar 8 ” represents a nitrogen atom
- Ar 8 represents “substituted or unsubstituted aromatic hydrocarbon group”, “substituted or unsubstituted aromatic heterocyclic group” or Examples of the “substituted or unsubstituted condensed polycyclic aromatic group” include the same groups as those exemplified above, and the substituents that these groups may have are also exemplified below. Substituents can be mentioned.
- substituted aromatic hydrocarbon group “substituted aromatic heterocyclic group” or “substituted condensed polycyclic aromatic group” represented by Ar 1 to Ar 4 in the general formula (1), Specifically, deuterium atom, trifluoromethyl group, cyano group, nitro group; halogen atom such as fluorine atom, chlorine atom, bromine atom, iodine atom; methyl group, ethyl group, n-propyl group, isopropyl group, a linear or branched alkyl group having 1 to 6 carbon atoms such as n-butyl group, isobutyl group, tert-butyl group, n-pentyl group, isopentyl group, neopentyl group, n-hexyl group; methyloxy group A linear or branched alkyloxy group having 1 to 6 carbon atoms such as ethyloxy group
- N—Ar 8 means “substituted or unsubstituted aromatic hydrocarbon group” represented by Ar 1 to Ar 4 in the above general formula (1), “substituted or unsubstituted aromatic complex”. It means the same as “N—Ar 8 ” defined for “ring group” or “substituted or unsubstituted condensed polycyclic aromatic group”.
- R 1 to R 8 A linear or branched alkyl group having 1 to 6 carbon atoms which may have ", a" cycloalkyl group having 5 to 10 carbon atoms which may have a substituent "or" a substituent.
- “Straight or branched alkenyl group having 2 to 6 carbon atoms” which may have “straight or branched alkyl group having 1 to 6 carbon atoms”, “5 to 10 carbon atoms”
- Specific examples of the cycloalkyl group or the linear or branched alkenyl group having 2 to 6 carbon atoms include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an 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, 2-adamantyl group, vinyl group, allyl group, isopropenyl group and 2-butenyl group.
- N—Ar 8 means “substituted or unsubstituted aromatic hydrocarbon group” represented by Ar 1 to Ar 4 in the above general formula (1), “substituted or unsubstituted aromatic complex”. It means the same as “N—Ar 8 ” defined for “ring group” or “substituted or unsubstituted condensed polycyclic aromatic group”.
- “substituents” are represented by R 1 to R 8. Having a straight or branched alkyl group having 1 to 6 carbon atoms "," a cycloalkyl group having 5 to 10 carbon atoms having a substituent "or” straight chain having 2 to 6 carbon atoms having a substituent "
- the “substituent” in the “like or branched alkenyl group” is the “substituted aromatic hydrocarbon group” or “substituted aromatic heterocyclic group” represented by Ar 1 to Ar 4 in the general formula (1).
- lifted, and the aspect which can be taken can also mention the same thing.
- “substituents” are represented by R 1 to R 8.
- Specific examples of the “linear or branched alkyloxy group having 1 to 6 atoms” or “cycloalkyloxy group having 5 to 10 carbon atoms” specifically include a methyloxy group, an ethyloxy group, and an n-propyloxy group.
- N—Ar 8 means “substituted or unsubstituted aromatic hydrocarbon group” represented by Ar 1 to Ar 4 in the above general formula (1), “substituted or unsubstituted aromatic complex”. It means the same as “N—Ar 8 ” defined for “ring group” or “substituted or unsubstituted condensed polycyclic aromatic group”.
- “substituents” are represented by R 1 to R 8.
- the “substituent” in the “straight-chain or branched alkyloxy group having 1 to 6 carbon atoms” or “cycloalkyloxy group having 5 to 10 carbon atoms having a substituent” includes the above general formula (1
- R 1 to R 8 Represented by R 1 to R 8 in the structural formulas (B), (B-1), (B-2), (B-3), (B-4), (B ′), "Aromatic hydrocarbon group”, “Aromatic heterocyclic group” in “Substituted aromatic hydrocarbon group”, “Substituted or unsubstituted aromatic heterocyclic group” or “Substituted or unsubstituted condensed polycyclic aromatic group”
- a “condensed polycyclic aromatic group” is a “substituted or unsubstituted aromatic hydrocarbon group” represented by Ar 1 to Ar 4 in the general formula (1), “substituted or unsubstituted aromatic group”
- Ar 1 to Ar 4 in the general formula (1)
- the “substituent” in the “hydrocarbon group”, “substituted aromatic heterocyclic group” or “substituted condensed polycyclic aromatic group” is the “substituted” represented by Ar 1 to Ar 4 in the above general formula (1).
- the “aryloxy group” in the “substituted aryloxy group” specifically includes phenyloxy group, tolyloxy group, biphenylyloxy group, terphenylyloxy group, naphthyloxy group, anthryloxy group, phenanthryloxy group.
- N—Ar 8 means “substituted or unsubstituted aromatic hydrocarbon group” represented by Ar 1 to Ar 4 in the above general formula (1), “substituted or unsubstituted aromatic complex”. It means the same as “N—Ar 8 ” defined for “ring group” or “substituted or unsubstituted condensed polycyclic aromatic group”.
- Substituted aryloxy represented by R 1 to R 8 in the structural formulas (B), (B-1), (B-2), (B-3), (B-4), and (B ′)
- the “substituent” in the “group” is the “substituted aromatic hydrocarbon group”, “substituted aromatic heterocyclic group” or “substituted condensed polycycle” represented by Ar 1 to Ar 4 in the general formula (1).
- n represents an integer of 0 to 4, and n is preferably 0, 1 or 2, and more preferably 0 or 1.
- at least one of Ar 1 , Ar 2 , Ar 3 , Ar 4 is the structural formula (B), or at least one of Ar 1 , Ar 2 , Ar 3 , Ar 4 is the structure
- An embodiment having the formula (B) as a substituent, or at least one of Ar 1 , Ar 2 , Ar 3 , Ar 4 is the structural formula (B), and Ar 1 , Ar 2 , Ar 3 , Ar 4
- Ar 1 , Ar 2 , Ar 3 , Ar 4 Or at least one of Ar 1 , Ar 2 , Ar 3 , Ar 4 is the above-described structural formula (B), or Ar 1 , Ar 2 , Ar 3 , or Ar 4 has the structural formula (B) as a substituent, or any one of Ar 1 , Ar 2 , Ar 3 , Ar 4 is the structural formula (B)
- Ar 1 and Ar 4 have the structural formula (B-1), (B-3) or (B-4) as a substituent.
- the embodiment or the embodiment represented by the structural formula (B-2) is more preferable.
- Ar 1 , Ar 2 , Ar 3 , Ar 4 in the general formula (1) include an aromatic hydrocarbon group, a condensed polycyclic aromatic group, the structural formula (B), a thienyl group, a benzothienyl group, and a dibenzofura.
- Nyl group and dibenzothienyl group are preferable, and phenyl group, biphenylyl group, terphenylyl group, naphthyl group, phenanthryl group, fluorenyl group, the structural formula (B), thienyl group, benzothienyl group, dibenzofuranyl group, dibenzothienyl group are More preferred are a phenyl group, a biphenylyl group, a fluorenyl group, the structural formula (B), a dibenzofuranyl group, and a dibenzothienyl group.
- Ar 6 in Structural Formula (B-2), Ar 5 , Ar 6 , and Ar 7 in Structural Formulas (B) and (B ′) are an aromatic hydrocarbon group, a condensed polycyclic aromatic group, a thienyl group.
- Benzothienyl group, dibenzofuranyl group and dibenzothienyl group are preferable, and phenyl group, biphenylyl group, terphenylyl group, naphthyl group, phenanthryl group, fluorenyl group, thienyl group, benzothienyl group, dibenzofuranyl group, dibenzothienyl group More preferred.
- R 1 , R 2 , R 3 , R 4 , Ar 5 , Ar 6 , Ar 7 is a linking group.
- X represents a carbon atom or a nitrogen atom
- Y represents a carbon atom, an oxygen atom, a sulfur atom, or a nitrogen atom.
- Y when Y is an oxygen atom or a sulfur atom, Y has no Ar 7 linking group or substituent (Ar 7 does not exist), and when X and Y are nitrogen atoms, Any one of Ar 5 , Ar 6 , Ar 7 is a linking group or a substituent (no two of Ar 5 , Ar 6 , Ar 7 exist), X is a nitrogen atom and Y is a carbon atom In this case, any one of Ar 5 and Ar 6 is a linking group or a substituent (any of Ar 5 and Ar 6 does not exist).
- Y when X is a nitrogen atom, Y is preferably a nitrogen atom.
- the linking group of Ar 5 , Ar 6 or Ar 7 is Ar 1 , It is bonded to the carbon atom of Ar 2 , Ar 3 , Ar 4 (the structural formula (B) or (B ′) becomes a substituent of Ar 1 , Ar 2 , Ar 3 or Ar 4 ).
- the structural formulas (B) and (B ′) when X is a carbon atom, Y is preferably a carbon atom, an oxygen atom, or a sulfur atom, and more preferably an oxygen atom or a sulfur atom.
- the case where X is a nitrogen atom and Y is an oxygen atom or a sulfur atom is excluded from the present invention.
- the extinction coefficient of the capping layer is preferably 0.30 or more and preferably 0.40 or more when the wavelength of light transmitted through the capping layer is in the range of 400 nm to 410 nm. It is more preferable.
- the arylamine compound represented by the general formula (1) that is preferably used in the organic EL device of the present invention is a hole injection layer, a hole transport layer, a light emitting layer, an electron blocking layer, or a capping layer of the organic EL device. It can be used as a constituent material.
- the thickness of the capping layer is preferably in the range of 30 nm to 120 nm, and more preferably in the range of 40 nm to 80 nm.
- the refractive index of the capping layer is 1.85 or more when the wavelength of light transmitted through the capping layer is in the range of 450 nm to 750 nm. More preferably.
- the capping layer may be produced by laminating two or more different constituent materials.
- the organic EL element of the present invention has a capping layer having a refractive index higher than that of the semi-transparent electrode provided outside the transparent or semi-transparent electrode, an organic EL element capable of greatly improving the light extraction efficiency is provided. can get.
- the arylamine compound represented by the general formula (1) for the capping layer a film can be formed at a temperature of 400 ° C. or lower, so that the light emitting element is not damaged.
- the light extraction efficiency of each color can be optimized using the fine mask, and can be suitably applied to a full color display, and a clear and bright image with good color purity can be displayed.
- the organic EL element of the present invention uses a material for an organic EL element that has a high extinction coefficient, a high refractive index, excellent thin film stability, durability, and light resistance as a material for the capping layer. Compared to the organic EL element, it is not affected by sunlight, can maintain color purity, and can greatly improve the light extraction efficiency. Furthermore, it has become possible to realize an organic EL element with high efficiency and long life.
- the arylamine compound represented by the general formula (1) that is suitably used in the organic EL device of the present invention is a novel compound, and these compounds can be synthesized, for example, as follows.
- a 2-aminoarylazobenzene derivative is synthesized from a 1,2-diaminobenzene derivative and a nitroaryl derivative by a known method, and an oxidative cyclization reaction with bis (acetato-O) phenyliodine is performed.
- a benzotriazole derivative having a group can be synthesized (see, for example, Non-Patent Document 4).
- a bromo-substituted product of a benzotriazole derivative having an aryl group can be synthesized.
- an arylamine compound represented by the general formula (1) of the present invention can be synthesized by performing a condensation reaction such as an Ullmann reaction or a Buchwald-Hartwig reaction between the bromo-substituted product and diarylamine. .
- the brominated benzotriazole derivative can also be synthesized by brominating the synthesized benzotriazole derivative having an aryl group with N-bromosuccinimide or the like.
- bromo-substituted products having different substitution positions can be obtained by changing the bromination reagent and conditions.
- the arylamine compound represented by General formula (1) of this invention is compoundable by performing the same reaction.
- Suzuki coupling of a boronic acid or a boronic acid ester derivative see, for example, Non-Patent Document 5 synthesized by reacting various aryl halides with pinacol borane or bis (pinacolato) diboron, for this bromo-substituted product.
- the arylamine compound represented by the general formula (1) of the present invention can also be synthesized by performing a cross coupling reaction such as (see, for example, Non-Patent Document 6). Further, a boronic acid or a boronic acid ester (for example, see Non-Patent Document 5) derivative is synthesized from the bromo-substituted product, and a cross-coupling reaction such as Suzuki coupling with an aryl halide having various diarylamino groups (for example, The arylamine compound represented by the general formula (1) of the present invention can also be synthesized by performing Non-Patent Document 6).
- a cross coupling reaction such as (see, for example, Non-Patent Document 6).
- a boronic acid or a boronic acid ester for example, see Non-Patent Document 5
- a cross-coupling reaction such as Suzuki coupling with an aryl halide having various diarylamino groups
- a benzothiazole group, a benzothiazole group, a benzothiazole derivative, a benzoxazole derivative, or a bromo substituent of an indole derivative having a corresponding substituent, or a bromo substituent after bromination An arylamine compound represented by the general formula (1) of the present invention having a benzoxazole group or an indole group can be synthesized.
- Tg glass transition point
- refractive index is an index for improving the light extraction efficiency.
- the glass transition point (Tg) was measured with a high sensitivity differential scanning calorimeter (manufactured by Bruker AXS, DSC3100S) using powder.
- the refractive index and extinction coefficient were measured using a spectrophotometer (F10-RT-UV, manufactured by Filmetrics Co., Ltd.) by preparing a thin film of 80 nm on a silicon substrate.
- the absorbance is adjusted to a concentration of 10 -5 mol / l with a toluene solution, and the extinction coefficient is 5 ⁇ 10 -6 mol / l, 1 ⁇ 10 -5 mol / l, 1.5 ⁇ 10 -5 mol / l with a toluene solution.
- the concentration was adjusted to four concentrations of l and 2.0 ⁇ 10 ⁇ 5 mol / l, and the measurement was performed using an ultraviolet-visible near-infrared spectrophotometer (manufactured by JASCO Corporation, V-650).
- the structure of the organic EL device of the present invention is a light emitting device having a top emission structure, and is sequentially formed on a glass substrate with a metal anode, a hole transport layer, a light emitting layer, an electron transport layer, a translucent cathode, and a capping.
- a metal anode a hole transport layer between the anode and the hole transport layer, one having an electron blocking layer between the hole transport layer and the light emitting layer, and between the light emitting layer and the electron transport layer
- Examples thereof include those having a hole blocking layer and those having an electron injection layer between the electron transport layer and the cathode.
- each layer of the organic EL element is preferably about 200 nm to 750 nm, and more preferably about 350 nm to 600 nm.
- the film thickness of the capping layer is preferably 30 nm to 120 nm, for example, and more preferably 40 nm to 80 nm. In this case, good light extraction efficiency can be obtained. Note that the thickness of the capping layer can be changed as appropriate depending on the type of the light emitting material used for the light emitting element, the thickness of the organic EL element other than the capping layer, and the like.
- an electrode material having a large work function such as ITO or gold is used.
- an arylamine compound having a structure in which three or more triphenylamine structures are connected by a divalent group not containing a single bond or a hetero atom in the molecule for example, starburst Materials such as triphenylamine derivatives of various types, various triphenylamine tetramers, porphyrin compounds represented by copper phthalocyanine, acceptor heterocyclic compounds such as hexacyanoazatriphenylene, and coating-type polymer materials are used. be able to.
- These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used.
- These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- N, N′-diphenyl-N, N′-di (m-tolyl) benzidine hereinafter abbreviated as TPD
- NPD N, N′-diphenyl- N, N'-di ( ⁇ -naphthyl) benzidine
- TAPC 1,1-bis [4- (di-4-tolylamino) phenyl] cyclohexane
- N, N, N ′, N′-tetrabiphenylylbenzidine especially two triphenylamine structures in the molecule
- an arylamine compound having a structure in which a single bond or a divalent group not containing a hetero atom is connected, for example, N, N, N ′, N′-tetrabiphenylylbenzidine.
- arylamine compounds having a structure in which three or more triphenylamine structures in the molecule are linked by a divalent group not containing a single bond or a hetero atom such as various triphenylamine trimers and tetramers Is preferably used.
- These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used.
- These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- the material usually used for the layer is further P-doped with trisbromophenylamine hexachloroantimony or the structure of a benzidine derivative such as TPD.
- TPD a benzidine derivative
- TCTA N-carbazolyl triphenylamine
- mCP 1,3-bis (carbazol-9-yl) benzene
- Ad-Cz 2,2-bis (4-carbazol-9-ylphenyl) adamantane
- Carbazole derivatives such as 9- [4- (carbazol-9-yl) phenyl] -9- [4- (triphenylsilyl) phenyl] -9H-fluorene and triarylamine structures
- a compound having an electron-blocking action such as a compound having an electron can be used.
- These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used.
- These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- the light emitting layer of the organic EL device of the present invention metal complexes of quinolinol derivatives such as Alq 3 , various metal complexes, anthracene derivatives, bisstyrylbenzene derivatives, pyrene derivatives, oxazole derivatives, polyparaphenylene vinylene derivatives, and the like are used. be able to.
- the light-emitting layer may be composed of a host material and a dopant material.
- a thiazole derivative, a benzimidazole derivative, a polydialkylfluorene derivative, or the like can be used in addition to the light-emitting material.
- quinacridone coumarin, rubrene, perylene, and derivatives thereof
- benzopyran derivatives rhodamine derivatives, aminostyryl derivatives, and the like
- These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used.
- a phosphorescent material can be used as the light emitting material.
- a phosphorescent emitter of a metal complex such as iridium or platinum can be used.
- Green phosphorescent emitters such as Ir (ppy) 3
- blue phosphorescent emitters such as FIrpic and FIr6, red phosphorescent emitters such as Btp 2 Ir (acac), and the like are used as the host material.
- carbazole derivatives such as 4,4′-di (N-carbazolyl) biphenyl (CBP), TCTA, and mCP can be used.
- p-bis (triphenylsilyl) benzene (UGH2) and 2,2 ′, 2 ′′-(1,3,5-phenylene) -tris (1-phenyl-1H-benzimidazole) ) (TPBI) or the like, and a high-performance organic EL element can be manufactured.
- the phosphorescent light-emitting material into the host material by co-evaporation in the range of 1 to 30 weight percent with respect to the entire light-emitting layer.
- Non-Patent Document 7 a material that emits delayed fluorescence such as CDCB derivatives such as PIC-TRZ, CC2TA, PXZ-TRZ, and 4CzIPN as a light emitting material.
- CDCB derivatives such as PIC-TRZ, CC2TA, PXZ-TRZ, and 4CzIPN
- These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- a phenanthroline derivative such as bathocuproine (BCP) or aluminum (III) bis (2-methyl-8-quinolinato) -4-phenylphenolate (hereinafter abbreviated as BAlq).
- BCP bathocuproine
- BAlq aluminum (III) bis (2-methyl-8-quinolinato) -4-phenylphenolate
- BAlq aluminum (III) bis (2-methyl-8-quinolinato) -4-phenylphenolate
- BAlq aluminum (III) bis (2-methyl-8-quinolinato) -4-phenylphenolate
- BAlq aluminum (III) bis (2-methyl-8-quinolinato) -4-phenylphenolate
- BAlq aluminum (III) bis (2-methyl-8-quinolinato) -4-phenylphenolate
- BAlq aluminum (III) bis (2-methyl-8-quinolinato) -4-phenylphenolate
- BAlq aluminum (III) bis (2-methyl-8-quinolinato) -4-phenylphenolate
- metal complexes of quinolinol derivatives such as Alq 3 and BAlq, various metal complexes, triazole derivatives, triazine derivatives, oxadiazole derivatives, thiadiazole derivatives, pyridoindole derivatives, carbodiimides Derivatives, quinoxaline derivatives, phenanthroline derivatives, silole derivatives, and the like can be used.
- quinolinol derivatives such as Alq 3 and BAlq
- various metal complexes such as Alq 3 and BAlq
- triazole derivatives triazine derivatives
- oxadiazole derivatives oxadiazole derivatives
- thiadiazole derivatives pyridoindole derivatives
- carbodiimides Derivatives quinoxaline derivatives, phenanthroline derivatives, silole derivatives, and the like
- These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone,
- an alkali metal salt such as lithium fluoride and cesium fluoride
- an alkaline earth metal salt such as magnesium fluoride
- a metal oxide such as aluminum oxide
- a material usually used for the layer and further doped with a metal such as cesium can be used.
- an electrode material having a low work function such as aluminum, an alloy having a lower work function such as a magnesium silver alloy, a magnesium calcium alloy, a magnesium indium alloy, an aluminum magnesium alloy, ITO, IZO or the like is used as an electrode material.
- an arylamine compound represented by the general formula (1) may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used. These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- the organic EL element having the top emission structure has been described.
- the present invention is not limited to this, and the organic EL element having the bottom emission structure or the dual emission structure that emits light from both the top and bottom directions is used.
- organic EL elements In these cases, an electrode in a direction in which light is extracted from the light emitting element to the outside needs to be transparent or translucent.
- the refractive index of the material constituting the capping layer is preferably larger than the refractive index of the adjacent electrode.
- the refractive index of the material constituting the capping layer is preferably larger than the refractive index of the adjacent electrode, and the refractive index may be 1.70 or more, more preferably 1.80 or more, and 1.85. The above is particularly preferable.
- the glass transition point was calculated
- the compound of the present invention has a glass transition point of 100 ° C. or higher. This indicates that the thin film state is stable in the compound of the present invention.
- a deposited film having a film thickness of 80 nm is formed on a silicon substrate, and a refractive index n at wavelengths of 400 nm and 410 nm using a spectroscopic measurement device (F10-RT-UV, manufactured by Filmetrics).
- the extinction coefficient k was measured.
- the comparative compounds (2-1) and (2-2) having the following structural formulas were also measured (for example, see Patent Document 3). The measurement results are summarized in Table 1.
- the compound of the present invention has a value equal to or higher than the refractive index of the comparative compounds (2-1) and (2-2), which is expected to improve the light extraction efficiency in the organic EL device. it can.
- the extinction coefficients at wavelengths from 400 nm to 410 nm are 0.3 or less for the comparative compounds (2-1) and (2-2), whereas the compound of the present invention has a large value. This means that the sunlight having a wavelength of 400 nm to 410 nm is well absorbed and does not affect the material inside the element.
- the absorbance was adjusted to a concentration of 10 ⁇ 5 mol / l with a toluene solution and the absorbance at wavelengths of 400 nm and 410 nm was measured, and the extinction coefficient was 5 ⁇ 10 ⁇ 6 mol / l with a toluene solution. Adjusted to four concentrations of 1 ⁇ 10 -5 mol / l, 1.5 ⁇ 10 -5 mol / l, 2.0 ⁇ 10 -5 mol / l, an ultraviolet-visible near-infrared spectrophotometer (manufactured by JASCO, V The extinction coefficient was calculated from the calibration curve. For comparison, the comparative compound (2-2) having the above structural formula was also measured. The measurement results are summarized in Table 2.
- the absorbance at a wavelength of 400 nm to 410 nm is 0.1 or less for the comparative compound (2-2), whereas the compound of the present invention has a large value of 0.2 or more.
- Both the compounds of the present invention have a large value with respect to the absorption coefficient 48856 of the comparative compound (2-2) with respect to the light absorption wavelength of 400 nm to 410 nm. If it is, it will show that light will be absorbed well, and also about the thin film, it will show that it absorbs light so that it is thick, and it is the material excellent in light resistance.
- the organic EL element has a hole injection layer 3, a hole transport layer 4, a light emitting layer 5, an electron transport on a glass substrate 1 on which a reflective ITO electrode is previously formed as a metal anode 2.
- the layer 6, the electron injection layer 7, the cathode 8, and the capping layer 9 were deposited in this order.
- the glass substrate 1 on which ITO with a film thickness of 50 nm, a reflective film of a silver alloy with a film thickness of 100 nm, and ITO with a film thickness of 5 nm were sequentially formed was performed. Drying was performed for 10 minutes on a hot plate heated to 250 ° C. Then, after performing UV ozone treatment for 2 minutes, this glass substrate with ITO was attached in a vacuum evaporation machine, and pressure was reduced to 0.001 Pa or less.
- an electron acceptor (Acceptor-1) having the following structural formula and a compound (3-1) having the following structural formula are formed as the hole injection layer 3 so as to cover the transparent anode 2, and the deposition rate ratio is Acceptor-1: compound.
- a compound (3-1) having the following structural formula was formed as the hole transport layer 4 so as to have a film thickness of 140 nm.
- a compound (3-2) having the following structural formula and a compound (3-3) having the following structural formula are formed as the light emitting layer 5 with a deposition rate ratio of (3-2) :( 3- 3) Dual vapor deposition was performed at a vapor deposition rate of 5:95 to form a film thickness of 20 nm.
- lithium fluoride was formed as the electron injection layer 7 so as to have a film thickness of 1 nm.
- a magnesium silver alloy was formed as a cathode 8 so as to have a film thickness of 12 nm.
- the compound (1-22) of Example 3 was formed to a thickness of 60 nm as the capping layer 9.
- the characteristic measurement was performed at normal temperature in air
- Example 10 the organic layer was formed under the same conditions except that the compound (1-23) of Example 4 was formed to a thickness of 60 nm instead of the compound (1-22) of Example 3 as the capping layer 9.
- An EL element was produced. About the produced organic EL element, the characteristic measurement was performed at normal temperature in air
- Example 10 For comparison, in Example 10, except that the capping layer 9 was formed by replacing the compound (1-23) of Example 4 with a comparative compound (2-2) having the above structural formula so as to have a film thickness of 60 nm.
- An organic EL element was produced under the same conditions. About the produced organic EL element, the characteristic measurement was performed at normal temperature in air
- Table 3 summarizes the results of measuring the element lifetime using the organic EL elements produced in Example 10, Example 11 and Comparative Example 1.
- the lifetime of the element was measured as the time to decay to 95% attenuation when the constant current drive of 10 mA / cm 2 was performed and the initial luminance was 100%.
- the driving voltage at a current density of 10 mA / cm 2 is almost the same for the device of Comparative Example 1 using Comparative Compound (2-2) and the devices of Example 10 and Example 11.
- the devices of Example 10 and Example 11 were improved over the device of Comparative Example 1 using Comparative Compound (2-2). This indicates that the light extraction efficiency can be significantly improved by including a material having a high refractive index suitable for the organic EL device of the present invention in the capping layer.
- the arylamine compound represented by the general formula (1) suitably used in the organic EL device of the present invention has a high absorption coefficient, a high refractive index, and can greatly improve the light extraction efficiency. Since the thin film state is stable, it is excellent as a compound for an organic EL device. By producing an organic EL device using the compound, high efficiency can be obtained, and durability and light resistance are improved so that sunlight is absorbed and the material inside the device is not affected. be able to.
- the use of the compound having no absorption in each of the blue, green, and red wavelength regions is particularly suitable for displaying a clear and bright image with good color purity. For example, it has become possible to develop home appliances and lighting.
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Abstract
Description
また、これらの置換基同士が単結合、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N-Ar8を介して互いに結合して環を形成していてもよい。ここで、「N-Ar8」は、上記一般式(1)中のAr1~Ar4で表される「置換もしくは無置換の芳香族炭化水素基」、「置換もしくは無置換の芳香族複素環基」または「置換もしくは無置換の縮合多環芳香族基」に関して規定した「N-Ar8」と同じものを意味する。
一般式(1)において、Ar1、Ar2、Ar3、Ar4の少なくとも1つが前記構造式(B)である態様か、Ar1、Ar2、Ar3、Ar4の少なくとも1つが前記構造式(B)をその置換基として有する態様、もしくは、Ar1、Ar2、Ar3、Ar4の少なくとも1つが前記構造式(B)であり、かつAr1、Ar2、Ar3、Ar4の少なくとも1つが前記構造式(B)をその置換基として有する態様であるものとし、Ar1、Ar2、Ar3、Ar4のいずれか2つが前記構造式(B)である態様か、Ar1、Ar2、Ar3、Ar4のいずれか2つが前記構造式(B)をその置換基として有する態様、もしくは、Ar1、Ar2、Ar3、Ar4のいずれか1つが前記構造式(B)であり、かつ前記構造式(B)ではないAr1、Ar2、Ar3、Ar4のいずれか1つが前記構造式(B)をその置換基として有する態様であることが好ましく、Ar1およびAr4が前記構造式(B)である態様か、Ar1およびAr4が前記構造式(B)をその置換基として有する態様、もしくは、Ar1が前記構造式(B)であり、Ar4が前記構造式(B)をその置換基として有する態様であることがより好ましく、Ar1およびAr4が前記構造式(B-1)、(B-3)または(B-4)を置換基として有する態様、もしくは、前記構造式(B-2)である態様がより好ましい。
一般式(1)中のAr1、Ar2、Ar3、Ar4としては、芳香族炭化水素基、縮合多環芳香族基、前記構造式(B)、チエニル基、ベンゾチエニル基、ジベンゾフラニル基、ジベンゾチエニル基が好ましく、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、フェナントリル基、フルオレニル基、前記構造式(B)、チエニル基、ベンゾチエニル基、ジベンゾフラニル基、ジベンゾチエニル基がより好ましく、フェニル基、ビフェニリル基、フルオレニル基、前記構造式(B)、ジベンゾフラニル基、ジベンゾチエニル基が特に好ましい。
構造式(B-2)中のAr6、構造式(B)、(B’)中のAr5、Ar6、Ar7としては、芳香族炭化水素基、縮合多環芳香族基、チエニル基、ベンゾチエニル基、ジベンゾフラニル基、ジベンゾチエニル基が好ましく、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、フェナントリル基、フルオレニル基、チエニル基、ベンゾチエニル基、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。
一般式(1)において、R1、R2、R3、R4、Ar5、Ar6、Ar7のいずれか1つのみが連結基であるものとする。
構造式(B)、(B’)において、Xは炭素原子または窒素原子を表し、Yは炭素原子、酸素原子、硫黄原子、または窒素原子を表す。ここで、Yが酸素原子、もしくは硫黄原子である場合、YはAr7の連結基、もしくは置換基を有さない(Ar7が存在しない)ものとし、XおよびYが窒素原子である場合、Ar5、Ar6、Ar7のいずれかひとつが連結基、もしくは置換基である(Ar5、Ar6、Ar7のいずれかふたつが存在しない)ものとし、Xが窒素原子かつYが炭素原子である場合、Ar5、Ar6のいずれかが連結基、もしくは置換基である(Ar5、Ar6のいずれかが存在しない)ものとする。
構造式(B)、(B’)において、Xが窒素原子である場合、Yは窒素原子であることが好ましく、この場合において、Ar5、Ar6もしくはAr7の連結基は、Ar1、Ar2、Ar3、Ar4の炭素原子と結合する(構造式(B)もしくは(B’)が、Ar1、Ar2、Ar3もしくはAr4の置換基となる)のが、化合物の安定性の観点から好ましい。
構造式(B)、(B’)において、Xが炭素原子である場合、Yは炭素原子、酸素原子、または硫黄原子であることが好ましく、酸素原子、または硫黄原子であることがより好ましい。
構造式(B)、(B’)において、Xが窒素原子、かつYが酸素原子もしくは硫黄原子である場合は本発明から除かれる。
ここでハロゲン原子、例えばブロモ原子を置換基として有する、1,2-ジアミノベンゼン誘導体もしくはニトロアリール誘導体を用いることによって、アリール基を有するベンゾトリアゾール誘導体のブロモ置換体を合成することができる。続いて、このブロモ置換体とジアリールアミンとのウルマン反応、ブッフバルド・ハートウィッグ反応などによる縮合反応を行うことによって、本発明の一般式(1)で表されるアリールアミン化合物を合成することができる。
また、前記合成したアリール基を有するベンゾトリアゾール誘導体に対して、N-ブロモコハク酸イミドなどによるブロモ化を行うことによっても、ブロモ化されたベンゾトリアゾール誘導体を合成することができる。ここで、ブロモ化の試薬、条件を変更することによって、置換位置の異なるブロモ置換体を得ることができる。そして、同様の反応を行うことによって、本発明の一般式(1)で表されるアリールアミン化合物を合成することができる。
また、このブロモ置換体に対し、種々のアリールハライドとピナコールボランやビス(ピナコラート)ジボロンとの反応で合成されたボロン酸またはボロン酸エステル誘導体(例えば、非特許文献5参照)とをSuzukiカップリングなどのクロスカップリング反応(例えば、非特許文献6参照)を行うことによっても、本発明の一般式(1)で表されるアリールアミン化合物を合成することができる。
また、前記ブロモ置換体からボロン酸またはボロン酸エステル(例えば、非特許文献5参照)誘導体を合成し、種々のジアリールアミノ基を有するアリールハライドとのSuzukiカップリングなどのクロスカップリング反応(例えば、非特許文献6参照)を行うことによっても、本発明の一般式(1)で表されるアリールアミン化合物を合成することができる。
ここで、相当する置換基を有するベンゾチアゾール誘導体、ベンゾオキサゾール誘導体、もしくはインドール誘導体のブロモ置換体、もしくはブロモ化を行った後のブロモ置換体に対し、同様の反応を行うことによって、ベンゾチアゾール基、ベンゾオキサゾール基、もしくはインドール基を有する本発明の一般式(1)で表されるアリールアミン化合物を合成することができる。
窒素置換した反応容器に、2-(4-ブロモフェニル)-2H-ベンゾ[1,2,3]トリアゾール4.2g、N,N’-ジフェニルベンジジン2.3g、tert-ブトキシナトリウム2.0g、トルエン50mlを加え、30分間超音波を照射しながら窒素ガスを通気した。酢酸パラジウム62.0mg、トリ-tert-ブチルホスフィン0.2mlを加えて加熱し、91℃で5時間攪拌した。室温まで冷却した後、トルエン50mlを加え、抽出操作を行うことによって有機層を採取した。有機層を濃縮した後、カラムクロマトグラフ(担体:NHシリカゲル、溶離液:トルエン/n-ヘキサン)によって精製し、さらに、n-ヘキサン100mlを用いた分散洗浄を行うことによって、N,N’-ビス{4-(2H-ベンゾ[1,2,3]トリアゾール-2-イル)フェニル}-N,N’-ジフェニル-4,4’-ジアミノ-1,1’-ビフェニル(化合物(1-1))の黄色粉体3.3g(収率66%)を得た。
1H-NMR(THF-d8)で以下の34個の水素のシグナルを検出した。
δ(ppm)=8.26(4H)、7.89(4H)、7.60(4H)、7.39(4H)、7.33(4H)、7.24(4H)、7.21(8H)、7.10(2H)。
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14.0g、{4-(2H-ベンゾ[1,2,3]トリアゾール-2-イル)フェニル}フェニルアミン18.3g、炭酸カリウム13.2g、銅粉0.3g、亜硫酸水素ナトリウム0.9g、3,5-ジ-tert-ブチルサリチル酸0.7g、ドデシルベンゼン30mlを加えて加熱し、210℃で44時間撹拌した。室温まで放冷した後、トルエン50mlを加え、析出物をろ過によって採取した。析出物に1,2-ジクロロベンゼン230mlを加え、加熱することによって溶解し、熱時ろ過によって不溶物を除去した。ろ液を濃縮し、1,2-ジクロロベンゼンを用いた晶析精製を行った後、メタノールを用いた分散洗浄を行うことによって、N,N’-ビス{4-(2H-ベンゾ[1,2,3]トリアゾール-2-イル)フェニル}-N,N’-ジフェニル-4,4’’-ジアミノ-1,1’:4’,1’’-ターフェニル(化合物(1-2))の黄色粉体22.2g(収率96%)を得た。
1H-NMR(CDCl3)で以下の38個の水素のシグナルを検出した。
δ(ppm)=8.24(4H)、7.99-7.92(4H)、7.72-7.58(7H)、7.50-7.12(23H)。
実施例1において、{4-(2H-ベンゾ[1,2,3]トリアゾール-2-イル)フェニル}フェニルアミンに代えて、{4-(ベンゾオキサゾール-2-イル)フェニル}フェニルアミンを用い、同様の条件で反応を行うことによって、N,N’-ビス{4-(ベンゾオキサゾール-2-イル)フェニル}-N,N’-ジフェニル-4,4’’-ジアミノ-1,1’:4’,1’’-ターフェニル(化合物(1-22))の黄色粉体12.4g(収率47%)を得た。
1H-NMR(CDCl3)で以下の38個の水素のシグナルを検出した。
δ(ppm)=8.13(4H)、7.80-7.55(11H)、7.50-7.16(23H)。
実施例1において、2-(4-ブロモフェニル)-2H-ベンゾ[1,2,3]トリアゾールに代えて、2-(4-ブロモフェニル)-ベンゾオキサゾールを用い、同様の条件で反応を行うことによって、N,N’-ビス{4-(ベンゾオキサゾール-2-イル)フェニル}-N,N’-ジフェニル-4,4’-ジアミノ-1,1’-ビフェニル(化合物(1-23))の淡黄色粉体8.8g(収率54%)を得た。
1H-NMR(CDCl3)で以下の34個の水素のシグナルを検出した。
δ(ppm)=8.12(4H)、7.80-7.72(2H)、7.60-7.53(5H)、7.41-7.14(23H)。
実施例1において、2-(4-ブロモフェニル)-2H-ベンゾ[1,2,3]トリアゾールに代えて、2-(4-ブロモフェニル)-ベンゾチアゾールを用い、同様の条件で反応を行うことによって、N,N’-ビス{4-(ベンゾチアゾール-2-イル)フェニル}-N,N’-ジフェニル-4,4’-ジアミノ-1,1’-ビフェニル(化合物(1-25))の淡黄色粉体9.3g(収率62%)を得た。
1H-NMR(CDCl3)で以下の34個の水素のシグナルを検出した。
δ(ppm)=8.10-7.88(8H)、7.60-7.13(26H)。
窒素置換した反応容器に、N-{4-(ベンゾチアゾール-2-イル)フェニル}フェニルアミン9.3g、4,4’’-ジヨード-1,1’:4’,1’’-ターフェニル7.1g、tert-ブトキシナトリウム4.6g、トルエン140mlを加え、30分間超音波を照射しながら窒素を通気した。酢酸パラジウム0.20g、tert-ブチルホスフィンの50%(v/v)トルエン溶液0.5gを加えて加熱し、攪拌しながら3時間加熱還流した。室温まで冷却し、ろ過によって析出物を採取した後、1,2-ジクロロベンゼン/メタノールの混合溶媒を用いた晶析精製を繰り返すことによって、N,N’-ビス{4-(ベンゾチアゾール-2-イル)フェニル}-N,N’-ジフェニル-4,4’’-ジアミノ-1,1’:4’,1’’-ターフェニル(化合物(1-27))の黄色粉体7.0g(収率58%)を得た。
1H-NMR(THF-d8)で以下の38個の水素のシグナルを検出した。
δ(ppm)=8.07-7.88(8H)、7.70-7.60(8H)、7.54-7.46(2H)、7.40-7.15(20H)。
ガラス転移点
例示化合物(1-1) 125℃
例示化合物(1-2) 135℃
例示化合物(1-22) 137℃
例示化合物(1-23) 128℃
例示化合物(1-25) 127℃
例示化合物(1-27) 137℃
この電子注入層7の上に、陰極8としてマグネシウム銀合金を膜厚12nmとなるように形成した。最後に、キャッピング層9として実施例3の化合物(1-22)を膜厚60nmとなるように形成した。作製した有機EL素子について、大気中、常温で特性測定を行った。
作製した有機EL素子に直流電圧を印加した発光特性の測定結果を表3にまとめて示した。
比較のために、実施例10において、キャッピング層9として実施例4の化合物(1-23)に代えて上記構造式の比較化合物(2-2)を膜厚60nmとなるように形成した以外は、同様の条件で有機EL素子を作製した。作製した有機EL素子について、大気中、常温で特性測定を行った。作製した有機EL素子に直流電圧を印加した発光特性の測定結果を表3にまとめて示した。
2 金属陽極
3 正孔注入層
4 正孔輸送層
5 発光層
6 電子輸送層
7 電子注入層
8 陰極
9 キャッピング層
Claims (16)
- 少なくとも陽極電極、正孔輸送層、発光層、電子輸送層、陰極電極およびキャッピング層をこの順に有する有機エレクトロルミネッセンス素子において、前記キャッピング層の材料の消衰係数が波長400nmから410nmで0.3以上であり、かつ、濃度10-5mol/lの吸収スペクトルにおいて波長400nmから410nmにおける吸光度が0.2以上である材料を含む、有機エレクトロルミネッセンス素子。
- 前記キャッピング層の材料の消衰係数が波長410nmから430nmで0.1以上である請求項1に記載の有機エレクトロルミネッセンス素子。
- 前記キャッピング層が下記一般式(1)で表されるアリールアミン化合物を含む、請求項1に記載の有機エレクトロルミネッセンス素子。
(式中、Ar1、Ar2、Ar3、Ar4は相互に同一でも異なってもよく、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、または置換もしくは無置換の縮合多環芳香族基を表し、nは0~4の整数を表す。ここで、Ar1、Ar2、Ar3、Ar4の少なくとも1つは、下記構造式(B)で示される1価基であるか、もしくは、該1価基を置換基として有するものとする。)
(式中、R1、R2、R3、R4は相互に同一でも異なってもよく、連結基、もしくは水素原子、重水素原子、フッ素原子、塩素原子、シアノ基、ニトロ基、置換基を有していてもよい炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換基を有していてもよい炭素原子数5ないし10のシクロアルキル基、置換基を有していてもよい炭素原子数2ないし6の直鎖状もしくは分岐状のアルケニル基、置換基を有していてもよい炭素原子数1ないし6の直鎖状もしくは分岐状のアルキルオキシ基、置換基を有していてもよい炭素原子数5ないし10のシクロアルキルオキシ基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、置換もしくは無置換の縮合多環芳香族基、または置換もしくは無置換のアリールオキシ基であって、単結合、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N-Ar8を介して互いに結合して環を形成していてもよい。Ar8は置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、または置換もしくは無置換の縮合多環芳香族基を表す。Xは炭素原子または窒素原子を表し、Yは炭素原子、酸素原子、硫黄原子、または窒素原子を表し、Ar5は連結基、または、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、または置換もしくは無置換の縮合多環芳香族基を表し、Ar6、Ar7は相互に同一でも異なってもよく、連結基、または、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、または置換もしくは無置換の縮合多環芳香族基であって、Yが酸素原子、もしくは硫黄原子である場合、YはAr7を有さないものとし、XおよびYが窒素原子である場合、Ar5、Ar6、Ar7のいずれかひとつが連結基、もしくは置換基であるものとし、Xが窒素原子かつYが炭素原子である場合、XはAr6を有さないものとする。Ar8は置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、または置換もしくは無置換の縮合多環芳香族基を表す。但し、R1、R2、R3、R4、Ar5、Ar6、Ar7のいずれか1つのみが連結基であるものとし、Xが窒素原子、かつYが酸素原子、もしくは硫黄原子である場合を除く。) - 前記構造式(B)が下記構造式(B-1)で示される1価基である、請求項1記載の有機エレクトロルミネッセンス素子。
(式中、R1、R2、R3、R4は相互に同一でも異なってもよく、水素原子、重水素原子、フッ素原子、塩素原子、シアノ基、ニトロ基、置換基を有していてもよい炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換基を有していてもよい炭素原子数5ないし10のシクロアルキル基、置換基を有していてもよい炭素原子数2ないし6の直鎖状もしくは分岐状のアルケニル基、置換基を有していてもよい炭素原子数1ないし6の直鎖状もしくは分岐状のアルキルオキシ基、置換基を有していてもよい炭素原子数5ないし10のシクロアルキルオキシ基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、置換もしくは無置換の縮合多環芳香族基、または置換もしくは無置換のアリールオキシ基であって、単結合、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N-Ar8を介して互いに結合して環を形成してもよい。Ar8は置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、または置換もしくは無置換の縮合多環芳香族基を表す。) - 前記構造式(B)が下記構造式(B-2)で示される1価基である、請求項1記載の有機エレクトロルミネッセンス素子。
(式中、R1、R3、R4は相互に同一でも異なってもよく、水素原子、重水素原子、フッ素原子、塩素原子、シアノ基、ニトロ基、置換基を有していてもよい炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換基を有していてもよい炭素原子数5ないし10のシクロアルキル基、置換基を有していてもよい炭素原子数2ないし6の直鎖状もしくは分岐状のアルケニル基、置換基を有していてもよい炭素原子数1ないし6の直鎖状もしくは分岐状のアルキルオキシ基、置換基を有していてもよい炭素原子数5ないし10のシクロアルキルオキシ基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、置換もしくは無置換の縮合多環芳香族基、または置換もしくは無置換のアリールオキシ基であって、R3とR4は単結合、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N-Ar8を介して互いに結合して環を形成してもよい。Ar6、Ar8は相互に同一でも異なってもよく、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、または置換もしくは無置換の縮合多環芳香族基を表す。) - 前記構造式(B)が下記構造式(B-3)で示される1価基である、請求項1記載の有機エレクトロルミネッセンス素子。
(式中、R1、R2、R3、R4は相互に同一でも異なってもよく、水素原子、重水素原子、フッ素原子、塩素原子、シアノ基、ニトロ基、置換基を有していてもよい炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換基を有していてもよい炭素原子数5ないし10のシクロアルキル基、置換基を有していてもよい炭素原子数2ないし6の直鎖状もしくは分岐状のアルケニル基、置換基を有していてもよい炭素原子数1ないし6の直鎖状もしくは分岐状のアルキルオキシ基、置換基を有していてもよい炭素原子数5ないし10のシクロアルキルオキシ基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、置換もしくは無置換の縮合多環芳香族基、または置換もしくは無置換のアリールオキシ基であって、単結合、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N-Ar8を介して互いに結合して環を形成してもよい。Ar8は置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、または置換もしくは無置換の縮合多環芳香族基を表す。) - 前記構造式(B)が下記構造式(B-4)で示される1価基である、請求項1記載の有機エレクトロルミネッセンス素子。
(式中、R1、R2、R3、R4は相互に同一でも異なってもよく、水素原子、重水素原子、フッ素原子、塩素原子、シアノ基、ニトロ基、置換基を有していてもよい炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換基を有していてもよい炭素原子数5ないし10のシクロアルキル基、置換基を有していてもよい炭素原子数2ないし6の直鎖状もしくは分岐状のアルケニル基、置換基を有していてもよい炭素原子数1ないし6の直鎖状もしくは分岐状のアルキルオキシ基、置換基を有していてもよい炭素原子数5ないし10のシクロアルキルオキシ基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、置換もしくは無置換の縮合多環芳香族基、または置換もしくは無置換のアリールオキシ基であって、単結合、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N-Ar8を介して互いに結合して環を形成してもよい。Ar8は置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、または置換もしくは無置換の縮合多環芳香族基を表す。) - 前記構造式(B)が下記構造式(B’)で示される1価基である、請求項1記載の有機エレクトロルミネッセンス素子。
(式中、R3、R4、R5、R6、R7、R8は相互に同一でも異なってもよく、連結基、もしくは水素原子、重水素原子、フッ素原子、塩素原子、シアノ基、ニトロ基、置換基を有していてもよい炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換基を有していてもよい炭素原子数5ないし10のシクロアルキル基、置換基を有していてもよい炭素原子数2ないし6の直鎖状もしくは分岐状のアルケニル基、置換基を有していてもよい炭素原子数1ないし6の直鎖状もしくは分岐状のアルキルオキシ基、置換基を有していてもよい炭素原子数5ないし10のシクロアルキルオキシ基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、置換もしくは無置換の縮合多環芳香族基、または置換もしくは無置換のアリールオキシ基であって、単結合、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N-Ar8を介して互いに結合して環を形成していてもよい。Xは炭素原子または窒素原子を表し、Yは炭素原子、酸素原子、硫黄原子、または窒素原子を表し、Ar5は連結基、または、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、または置換もしくは無置換の縮合多環芳香族基を表し、Ar6、Ar7は相互に同一でも異なってもよく、連結基、または、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、または置換もしくは無置換の縮合多環芳香族基であって、Yが酸素原子、もしくは硫黄原子である場合、YはAr7を有さないものとし、XおよびYが窒素原子である場合、Ar5、Ar6、Ar7のいずれかひとつが連結基、もしくは置換基であるものとし、Xが窒素原子かつYが炭素原子である場合、XはAr6を有さないものとする。Ar8は置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、または置換もしくは無置換の縮合多環芳香族基を表す。但し、R3、R4、R5、R6、R7、R8、Ar5、Ar6、Ar7のいずれか1つのみが連結基であるものとし、Xが窒素原子、かつYが酸素原子、もしくは硫黄原子である場合を除く。) - 前記一般式(1)において、nが0である、請求項1記載の有機エレクトロルミネッセンス素子。
- 前記一般式(1)において、nが1である、請求項1記載の有機エレクトロルミネッセンス素子。
- 前記一般式(1)において、nが2である、請求項1記載の有機エレクトロルミネッセンス素子。
- 前記一般式(1)において、Ar1、Ar2、Ar3、Ar4のいずれか2つが、前記構造式(B)で示される1価基であるか、もしくは、該1価基を置換基として有するものである、請求項1記載の有機エレクトロルミネッセンス素子。
- 前記一般式(1)において、Ar1およびAr4が、前記構造式(B)で示される1価基であるか、もしくは、該1価基を置換基として有するものである、請求項1記載の有機エレクトロルミネッセンス素子。
- 前記キャッピング層の厚さが、30nm~120nmの範囲内である、請求項1記載の有機エレクトロルミネッセンス素子。
- 前記キャッピング層の屈折率が、該キャッピング層を透過する光の波長が400nm~750nmの範囲内において、1.85以上である、請求項1記載の有機エレクトロルミネッセンス素子。
- 前記一般式(1)で表される化合物を有機エレクトロルミネッセンス素子のキャッピング層に用いる方法。
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EP3432688A4 (en) | 2019-11-27 |
KR20180134331A (ko) | 2018-12-18 |
US20200328353A1 (en) | 2020-10-15 |
JPWO2017183625A1 (ja) | 2019-02-28 |
EP3432688B1 (en) | 2023-12-20 |
EP3432688A1 (en) | 2019-01-23 |
CN109076658A (zh) | 2018-12-21 |
US11056653B2 (en) | 2021-07-06 |
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