WO2021065492A1 - 有機電界発光素子 - Google Patents

有機電界発光素子 Download PDF

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WO2021065492A1
WO2021065492A1 PCT/JP2020/034993 JP2020034993W WO2021065492A1 WO 2021065492 A1 WO2021065492 A1 WO 2021065492A1 JP 2020034993 W JP2020034993 W JP 2020034993W WO 2021065492 A1 WO2021065492 A1 WO 2021065492A1
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group
host
carbon atoms
aromatic
general formula
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French (fr)
Japanese (ja)
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淳也 小川
孝弘 甲斐
匡志 多田
和成 吉田
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Nippon Steel Chemical and Materials Co Ltd
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Nippon Steel Chemical and Materials Co Ltd
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Priority to JP2021550580A priority Critical patent/JP7491938B2/ja
Priority to CN202080067824.4A priority patent/CN114521299B/zh
Priority to KR1020227010779A priority patent/KR102850443B1/ko
Priority to EP20870973.3A priority patent/EP4039680A4/en
Priority to US17/641,882 priority patent/US12559673B2/en
Publication of WO2021065492A1 publication Critical patent/WO2021065492A1/ja
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Definitions

  • the present invention relates to an organic electroluminescent device (referred to as an organic EL device). More specifically, the present invention relates to an organic EL device using a material for an organic electroluminescent device composed of an oligopyridine compound.
  • Patent Document 1 discloses an organic EL device using a TTF (Triplet-Triplet Fusion) mechanism, which is one of the delayed fluorescence mechanisms.
  • TTF Triplet-Triplet Fusion
  • the TTF mechanism utilizes the phenomenon that singlet excitons are generated by the collision of two triplet excitons, and it is theoretically thought that the internal quantum efficiency can be increased to 40%.
  • Patent Document 2 discloses an organic EL device using a TADF (Thermally Activated Delayed Fluorescence) mechanism.
  • the TADF mechanism utilizes the phenomenon that inverse intersystem crossing from triplet excitons to singlet excitons occurs in materials with a small energy difference between singlet and triplet levels, and theoretically determines the internal quantum efficiency. It is believed that it can be increased to 100%. However, as with the phosphorescent light emitting device, further improvement in life characteristics is required.
  • Patent Documents 3 and 4 disclose that a biscarbazole compound is used as a mixed host.
  • Patent Document 5 discloses the use of a host material in which a plurality of hosts containing an indolocarbazole compound are premixed.
  • Patent Document 6 discloses that an indolocarbazole compound is used as a thermally activated delayed fluorescent dopant material.
  • Patent Document 7 discloses the use of a bipyridine compound as a host material.
  • Patent Document 8 discloses the use of a terpyridine compound as a host material.
  • Patent Document 9 discloses the use of a quaterpyridine compound as a host material. However, none of them can be said to be sufficient, and further improvement is desired.
  • An object of the present invention is to provide an organic EL element having high efficiency and high drive stability while having a low drive voltage, and a material for an organic electroluminescent element suitable therefor.
  • an organic electroluminescent element including one or more light emitting layers between an opposing anode and a cathode
  • at least one light emitting layer is selected from a compound represented by the following general formula (1).
  • An organic EL element characterized by containing a host and a second host selected from a compound represented by the following general formula (2), general formula (3), general formula (4) or general formula (5). is there.
  • L 1 to L 3 represent single-bonded, substituted or unsubstituted aromatic hydrocarbon groups having 6 to 30 carbon atoms, or linked aromatic groups in which they are linked by 2 to 10, and R 1 to R. 7 is independently hydrogen, hydrocarbon, an aliphatic hydrocarbon group having 1 to 10 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 10 carbon atoms, or an aromatic heterocyclic group having 3 to 12 carbon atoms.
  • Is. a, b, and c represent the number of repetitions, and a + b ⁇ 1.
  • p, q, r, s, t, u, v represent the number of substitutions, and each independently represents an integer of 1 to 3.
  • R 8 and R 9 independently represent hydrogen, an aromatic hydrocarbon group having 6 to 14 carbon atoms, or a group in which two aromatic hydrocarbon groups are linked.
  • L 4 and L 5 independently represent a phenylene group.
  • ring C is a heterocycle represented by the formula (3a), ring C is fused with an adjacent ring at an arbitrary position, and R 10 to R 12 are independently hydrogen, hydrocarbon, and carbon number 1 to 1. It is an aliphatic hydrocarbon group of 10 and an aromatic hydrocarbon group having 6 to 10 carbon atoms or an aromatic heterocyclic group having 3 to 12 carbon atoms, and L 6 is a single bond and an aromatic hydrocarbon group having 6 to 10 carbon atoms. Indicates a group, an aromatic heterocyclic group having 3 to 12 carbon atoms, or a linked aromatic group formed by linking them 2 to 10; Ar 1 is an aromatic hydrocarbon group having 6 to 10 carbon atoms or an aromatic hydrocarbon group having 3 to 10 carbon atoms. Twelve aromatic heterocyclic groups. x, y, and z each independently represent an integer of 0 to 3.
  • L 7 is an aromatic hydrocarbon group having an m-valent carbon number of 6 to 30, an aromatic heterocyclic group having 3 to 16 carbon atoms, or a linked aromatic group in which these aromatic rings are linked by 2 to 10. Although it is a group, it is not a group containing a carbazole ring.
  • R 13 is independently hydrogen, an alkyl group having 1 to 10 carbon atoms, or a cycloalkyl group having 3 to 11 carbon atoms.
  • m is the number of substitutions and indicates an integer of 1 to 3.
  • n is a repeat number, each independently an integer of 1 to 4, but at least one n is an integer of 2 to 4.
  • ring D is a heterocycle represented by the formula (5a), ring D is fused with an adjacent ring at an arbitrary position, and R 14 to R 16 are independently hydrogen, hydrocarbon, and carbon number 1 to 1. It is an aliphatic hydrocarbon group of 10 and an aromatic hydrocarbon group having 6 to 30 carbon atoms or an aromatic heterocyclic group having 3 to 12 carbon atoms, and L 8 is a single bond and an aromatic hydrocarbon group having 6 to 10 carbon atoms. It is a group or a linked aromatic group formed by linking them 2 to 10, and Ar 2 is an aromatic hydrocarbon group having 6 to 30 carbon atoms.
  • i, j, and k each independently represent an integer of 0 to 3.
  • the general formula (2) is the following formula (6).
  • R 8 , R 9 , L 4 , and L 5 agree with the general formula (2).
  • the general formula (3) is the following formula (7) or formula (8).
  • the rings C, R 10 , R 11 , Ar 1 , x, and y agree with the general formula (3).
  • the general formula (1) is one of the following formulas (9) to (11).
  • L 1 to L 3 , R 1 to R 7 , and c and p to v agree with the general formula (1).
  • the ratio of the 1st host to the total of the 1st host and the 2nd host is more than 20wt% and less than 55wt%.
  • the luminescent dopant material is an organic metal complex containing at least one metal selected from the group consisting of ruthenium, rhodium, palladium, silver, rhenium, osmium, iridium, platinum and gold, or a thermally activated delayed fluorescent luminescent dopant. Being a material.
  • a hole blocking layer is provided adjacent to the light emitting layer, and the hole blocking layer contains a compound represented by the general formula (1).
  • the present invention includes a step of mixing a first host and a second host to form a premixture, and then depositing a host material containing the host material to form a light emitting layer. This is a method for manufacturing an organic electroluminescent device.
  • the difference in 50% weight loss temperature between the first host and the second host is within 20 ° C.
  • the material used for the organic layer has high durability against electric charges, and it is particularly important to suppress leakage of excitons and electric charges to the peripheral layer in the light emitting layer.
  • it is effective to improve the bias of the light emitting region in the light emitting layer, and for that purpose, the amount of both charges (electrons / holes) injected into the light emitting layer or the transport of both charges in the light emitting layer. It is necessary to control the amount within a preferable range.
  • the oligopyridine compound represented by the formula (1) used in the present invention has a structure in which a plurality of pyridine rings are bonded and two or more carbazole rings are bonded to them.
  • the ability of the material used for the organic layer to inject and transport both charges is greatly influenced by the energy level of the molecular orbital of the material and the magnitude of the interaction between the molecules.
  • the oligopyridine compound has a particularly high electron injection transport ability, the introduction of the carbazole ring can suppress the proximity of the oligopyridine sites to each other due to its steric hindrance effect. Then, by changing the substituent type and bond position of the pyridine ring group, the intermolecular interaction of the molecular orbital that greatly contributes to the electron injection transport to the light emitting layer can be controlled at a high level.
  • the carbazole compounds represented by the general formulas (2) to (5) have a particularly high hole injection transport ability, and can be positively modified by changing the bonding mode of the carbazole ring and the type and number of substituents on the skeleton. Pore injection transportability can be controlled at a high level. Therefore, by using the oligopyridine compound and the carbazole compound in combination, the amount of both charges injected into the organic layer can be adjusted within a preferable range, and better device characteristics can be expected. In particular, in the case of a delayed fluorescence EL element or a phosphorescent EL element, since it has a sufficiently high minimum excitation triplet energy to confine the excitation energy generated in the light emitting layer, it can be seen from within the light emitting layer. There is no energy outflow, and high efficiency and long life can be achieved at low voltage.
  • the organic EL device of the present invention has a structure in which an anode, an organic layer, and a cathode are laminated on a substrate, and at least one layer of the organic layer contains the above-mentioned material for an organic electroluminescent device.
  • This organic EL device has an organic layer composed of a plurality of layers between the opposite anode and the cathode, and at least one of the plurality of layers is a light emitting layer, and there may be a plurality of light emitting layers. At least one of the light emitting layers is a light emitting layer composed of a first host, a second host, and a vapor-deposited layer containing a light-emitting dopant material.
  • the first host contained in the light emitting layer is selected from the compounds represented by the general formula (1), and the second host is the general formula (2), the general formula (3), the general formula (4) or the general formula.
  • the first host is selected from the oligopyridine compounds represented by the above general formula (1).
  • R 1 to R 7 are independently hydrogen, hydrocarbon, an aliphatic hydrocarbon group having 1 to 10 carbon atoms, an aromatic hydrocarbon group having 6 to 30 carbon atoms, or an aromatic hydrocarbon group having 3 to 12 carbon atoms. Indicates an aromatic heterocyclic group of. Preferably, it is an aliphatic hydrocarbon group having 1 to 8 carbon atoms, a phenyl group, or an aromatic heterocyclic group having 3 to 12 carbon atoms. More preferably, it is an aliphatic hydrocarbon group having 1 to 6 carbon atoms, a phenyl group, or a carbazole ring group.
  • an aromatic hydrocarbon group, an aromatic heterocyclic group, and a linked aromatic group formed by connecting these aromatic rings in a single bond have a substituent unless otherwise specified as unsubstituted. It is understood that it can be done. The same applies to aliphatic hydrocarbon groups.
  • aliphatic hydrocarbon group examples include methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl and the like. It is preferably an alkyl group having 1 to 4 carbon atoms.
  • aromatic hydrocarbon group or aromatic heterocyclic group examples include benzene, naphthalene, pyridine, pyrimidine, triazine, thiophene, isothiazole, thiazole, pyridazine, pyrrole, pyrazole, imidazole, triazole, thiadiazole, and pyrazine.
  • aromatic groups derived from benzene, pyridine, pyrimidine, triazine, thiophene, isothiazole, thiazole, pyridazine, pyrrole, pyrazole, imidazole, triazole, thiadiazole, pyrazine, furan, isoxazole, oxazole, or oxadiazole can be mentioned. Be done.
  • L 1 to L 3 independently represent single-bonded, substituted or unsubstituted aromatic hydrocarbon groups having 6 to 10 carbon atoms, or linked aromatic groups in which they are linked by 2 to 10.
  • aromatic hydrocarbon groups include divalent groups derived from benzene and naphthalene.
  • Preferred examples of the linked aromatic group include a divalent group derived from biphenyl, terphenyl.
  • a, b, and c represent the number of repetitions, and each independently represents an integer of 0 to 3, preferably an integer of 0 or 1. However, a + b ⁇ 1.
  • p to v represent the number of substitutions, each independently representing an integer of 1 to 3, preferably an integer of 1 or 2.
  • the compound represented by the general formula (1) there is a compound represented by any of the above general formulas (9) to (11).
  • the symbols common to the general formula (1) have the same meaning.
  • the second host is selected from the compounds represented by the above general formulas (2), (3), (4) or (5).
  • R 8 and R 9 independently represent hydrogen, an aromatic hydrocarbon group having 6 to 14 carbon atoms, or a linked aromatic group in which two aromatic rings of the aromatic hydrocarbon group are linked. It is preferably an aromatic hydrocarbon group having hydrogen and 6 to 12 carbon atoms, and more preferably an aromatic hydrocarbon group having 6 to 10 carbon atoms. It R 8 is hydrogen, or R 8 is a hydrogen, it is preferred embodiment R 9 is the above aromatic hydrocarbon group, or a linking aromatic groups.
  • R 8 and R 9 are aromatic hydrocarbon groups or linked aromatic groups are aromatic hydrocarbons such as benzene, naphthalene, anthracene, phenanthrene, fluorene, and biphenyl, or the aroma of these aromatic hydrocarbons.
  • aromatic hydrocarbons such as benzene, naphthalene, anthracene, phenanthrene, fluorene, and biphenyl
  • examples thereof include an aromatic group or a linked aromatic group formed by taking one H from a compound in which two group rings are linked.
  • Preferred are aromatic groups derived from benzene, naphthalene, anthracene and phenanthrene, or linked aromatic groups in which two of these aromatic groups are linked, and more preferably aromatic groups derived from benzene, naphthalene, phenanthrene or biphenyl. is there.
  • R 8 and R 9 are phenyl groups.
  • R 8 and R 9 may be hydrogen, in which case one may be the above aromatic group or linked aromatic group. It is more preferred that R 8 is hydrogen and R 9 is a phenyl group.
  • the above aromatic group or linked aromatic group may have a substituent, and a preferable substituent is an alkyl group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms.
  • L 4 and L 5 are phenylene groups, but the phenylene group may be any of an o-phenylene group, an m-phenylene group and a p-phenylene group. Preferably, it is a p-phenylene group or an m-phenylene group. And it is preferable that L 4 and L 5 are different. In this case, if R 8 and R 9 are hydrogen, they are treated as phenyl groups and different from phenylene groups.
  • the ring C is a heterocycle represented by the formula (3a), and the ring C is condensed with an adjacent ring at an arbitrary position.
  • R 10 to R 12 are independently hydrogens, hydrocarbons, aliphatic hydrocarbon groups having 1 to 10 carbon atoms, aromatic hydrocarbon groups having 6 to 10 carbon atoms, or aromatic heterocyclic groups having 3 to 12 carbon atoms. ..
  • it is an aliphatic hydrocarbon group having 1 to 8 carbon atoms, a phenyl group, or an aromatic heterocyclic group having 3 to 9 carbon atoms. More preferably, it is an aliphatic hydrocarbon group having 1 to 6 carbon atoms, a phenyl group, or an aromatic heterocyclic group having 3 to 6 carbon atoms.
  • aliphatic hydrocarbon group examples include methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl and the like. It is preferably an alkyl group having 1 to 4 carbon atoms.
  • aromatic hydrocarbon group or aromatic heterocyclic group examples include benzene, naphthalene, pyridine, pyrimidine, triazine, thiophene, isothiazole, thiazole, pyridazine, pyrrole, pyrazole, imidazole, triazole, thiadiazole, and pyrazine.
  • aromatic groups derived from benzene, pyridine, pyrimidine, triazine, thiophene, isothiazole, thiazole, pyridazine, pyrrole, pyrazole, imidazole, triazole, thiadiazole, pyrazine, furan, isoxazole, oxazole, or oxadiazole can be mentioned. Be done.
  • L 6 is an independently single-bonded aromatic hydrocarbon group having 6 to 10 carbon atoms, an aromatic heterocyclic group having 3 to 12 carbon atoms, or a linked aromatic group in which 2 to 10 of them are linked.
  • Preferred examples of the aromatic hydrocarbon group or an aromatic heterocyclic group, R 10 except that these groups are divalent groups are the same as the case of those groups.
  • Ar 1 is an aromatic hydrocarbon group having 6 to 10 carbon atoms or an aromatic heterocyclic group having 3 to 12 carbon atoms.
  • Preferred examples of aromatic hydrocarbon groups or aromatic heterocyclic groups are the same as for R 10 being these groups, except that these groups are divalent groups.
  • f, g, and h each independently represent an integer of 0 to 3.
  • the compound represented by the general formula (3) is preferably a compound represented by the above formula (7) or formula (8).
  • rings B, R 10 to R 13 , Ar 1 , x, y agree with general formula (3).
  • indolocarbazole compound represented by the general formula (3) Specific examples of the indolocarbazole compound represented by the general formula (3) are shown below, but the present invention is not limited thereto.
  • L 7 is an aromatic hydrocarbon group having 6 to 30 carbon atoms, an aromatic heterocyclic group having 3 to 30 carbon atoms, or a linked aromatic group in which these aromatic rings are linked.
  • a linked aromatic group is a group having a structure in which 2 to 10 aromatic rings of an aromatic hydrocarbon group or an aromatic heterocyclic group are linked by a single bond.
  • L 7 is an m-valent group, and the aromatic hydrocarbon group, aromatic heterocyclic group, or linked aromatic group may have a substituent.
  • L 7 is not a group containing a carbazole ring.
  • aromatic hydrocarbon group or the aromatic heterocyclic group examples include benzene, pentalene, inden, naphthalene, azulene, heptalene, octalene, indacene, acenaphthylene, phenalene, phenanthrene, anthracene, trinden, fluorantene, acephenanthrylene, etc.
  • the number of linked aromatic groups is preferably 2 to 10, more preferably 2 to 7, and the linked aromatic rings may be the same or different.
  • the bonding position at which the m carbazolyl groups are bonded is not limited, and it may be the terminal ring or the central ring of the linked aromatic rings.
  • the aromatic ring is a general term for an aromatic hydrocarbon ring and an aromatic heterocycle.
  • linked aromatic groups include groups formed by removing hydrogen from biphenyl, terphenyl, quaterphenyl, binaphthalene, phenyltriphenylene, phenyldibenzofuran, phenyldibenzothiophene, bisdibenzofuran, bisdibenzothiophene and the like.
  • preferred L 7 include groups derived from benzene, naphthalene, anthracene, biphenyl, terphenyl, dibenzofuran, dibenzothiophene, phenyldibenzofuran, or phenyldibenzothiophene. More preferably, groups derived from benzene, biphenyl, or terphenyl can be mentioned.
  • n represents an integer of 1 to 3.
  • M is preferably 1 or 2, and more preferably 1.
  • n is the number of repetitions, and each independently represents an integer of 1 to 4.
  • n is 1 to 3.
  • at least one n is an integer of 2-4.
  • n total number of carbazolyl groups
  • R 13 independently represents a hydrogen, an alkyl group having 1 to 10 carbon atoms, or a cycloalkyl group having 3 to 11 carbon atoms, respectively. It is preferably a hydrogen, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 3 to 8 carbon atoms, and more preferably a hydrogen, an alkyl group having 1 to 4 carbon atoms or a cycloalkyl group having 5 to 7 carbon atoms. ..
  • alkyl group examples include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group and a decyl group, preferably a methyl group, an ethyl group and a propyl group.
  • Examples thereof include a group, a butyl group, a pentyl group, a hexyl group, a heptyl group and an octyl group.
  • the alkyl group may be linear or branched.
  • cycloalkyl group examples include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group and a methylcyclohexyl group, and preferably a cyclohexyl group and a methylcyclohexyl group.
  • the ring D is a heterocycle represented by the formula (5a), and the ring D is condensed with an adjacent ring at an arbitrary position.
  • R 14 to R 16 are independently hydrogens, hydrocarbons, aliphatic hydrocarbon groups having 1 to 10 carbon atoms, aromatic hydrocarbon groups having 6 to 30 carbon atoms, or aromatic heterocyclic groups having 3 to 12 carbon atoms. .. These aliphatic hydrocarbon groups, aromatic hydrocarbon groups or aromatic heterocyclic groups are the same as in the case where R 10 to R 12 of the general formula (3) are these groups, and the preferable range is also the same. ..
  • L 8 is an independently single-bonded aromatic hydrocarbon group having 6 to 10 carbon atoms or a linked aromatic group in which 2 to 10 of them are linked. These aromatic hydrocarbon groups are the same as in the case where L 6 of the general formula (3) is these groups, and the preferable range is also the same.
  • Ar 2 is an aromatic hydrocarbon group having 6 to 30 carbon atoms. Examples of aromatic hydrocarbon groups are the same as when L 7 of the general formula (4) is these groups, and the preferred range is also the same.
  • i, j, and k each independently represent an integer of 0 to 3.
  • a light emitting layer comprises a first host selected from the compound represented by the general formula (1) and a second host selected from the compounds represented by the general formulas (2), (3), (4) or (5). It is possible to provide an excellent organic EL element by using it as a host material of.
  • the first host and the second host can be used by vapor deposition from different vapor deposition sources individually, but they are premixed before vapor deposition to form a premixture, and the premixture is simultaneously vapor-deposited from one vapor deposition source to emit light. It is preferable to form a layer.
  • the premix may be mixed with the luminescent dopant material required to form the light emitting layer or other hosts used as needed, but there is a large difference in the temperature at which the desired vapor pressure is achieved. In that case, it is preferable to vapor-deposit from another vapor deposition source.
  • the ratio of the first host to the total of the first host and the second host is preferably 20 to 60%, preferably more than 20%. , 55%, more preferably 40-50%.
  • FIG. 1 is a cross-sectional view showing a structural example of a general organic EL device used in the present invention, in which 1 is a substrate, 2 is an anode, 3 is a hole injection layer, 4 is a hole transport layer, and 5 is a light emitting layer. , 6 represent an electron transport layer, and 7 represents a cathode.
  • the organic EL device of the present invention may have an exciton blocking layer adjacent to the light emitting layer, or may have an electron blocking layer between the light emitting layer and the hole injection layer.
  • the exciton blocking layer can be inserted into either the anode side or the cathode side of the light emitting layer, and both can be inserted at the same time.
  • the organic EL device of the present invention has an anode, a light emitting layer, and a cathode as essential layers, but it is preferable to have a hole injection transport layer and an electron injection transport layer in addition to the essential layers, and further, a light emitting layer and an electron injection. It is preferable to have a hole blocking layer between the transport layers.
  • the hole injection transport layer means either or both of the hole injection layer and the hole transport layer
  • the electron injection transport layer means either or both of the electron injection layer and the electron transport layer.
  • the structure opposite to that of FIG. 1, that is, the cathode 7, the electron transport layer 6, the light emitting layer 5, the hole transport layer 4, and the anode 2 can be laminated in this order on the substrate 1, and in this case as well, the layers can be laminated in this order. It can be added or omitted.
  • the organic EL device of the present invention is preferably supported by a substrate.
  • the substrate is not particularly limited as long as it is conventionally used for an organic EL element, and for example, a substrate made of glass, transparent plastic, quartz or the like can be used.
  • anode material in the organic EL device a material having a large work function (4 eV or more), an alloy, an electrically conductive compound, or a mixture thereof is preferably used.
  • electrode materials include metals such as Au, and conductive transparent materials such as CuI, indium tin oxide (ITO), SnO 2, and ZnO.
  • conductive transparent materials such as CuI, indium tin oxide (ITO), SnO 2, and ZnO.
  • an amorphous material such as IDIXO (In 2 O 3- ZnO) capable of producing a transparent conductive film may be used.
  • a thin film may be formed by forming a thin film of these electrode materials by a method such as vapor deposition or sputtering, and a pattern of a desired shape may be formed by a photolithography method, or when pattern accuracy is not required so much (about 100 ⁇ m or more). May form a pattern through a mask having a desired shape during vapor deposition or sputtering of the electrode material.
  • a coatable substance such as an organic conductive compound
  • a wet film forming method such as a printing method or a coating method can also be used.
  • the sheet resistance as the anode is preferably several hundred ⁇ / ⁇ or less.
  • the film thickness depends on the material, but is usually selected in the range of 10 to 1000 nm, preferably 10 to 200 nm.
  • the cathode material a material having a small work function (4 eV or less) (electron-injectable metal), an alloy, an electrically conductive compound, or a mixture thereof is used.
  • electrode materials include sodium, sodium-potassium alloy, magnesium, lithium, magnesium / copper mixture, magnesium / silver mixture, magnesium / aluminum mixture, magnesium / indium mixture, aluminum / aluminum oxide (Al 2 O). 3 ) Examples thereof include a mixture, an indium, a lithium / aluminum mixture, and a rare earth metal.
  • a mixture of an electron injectable metal and a second metal which is a stable metal having a larger work function value than this for example, magnesium / silver mixture, magnesium / Aluminum mixture, magnesium / indium mixture, aluminum / aluminum oxide mixture, lithium / aluminum mixture, aluminum and the like are suitable.
  • the cathode can be produced by forming a thin film of these cathode materials by a method such as vapor deposition or sputtering.
  • the sheet resistance of the cathode is preferably several hundred ⁇ / ⁇ or less, and the film thickness is usually selected in the range of 10 nm to 5 ⁇ m, preferably 50 to 200 nm.
  • the emission brightness is improved, which is convenient.
  • a transparent or translucent cathode can be produced. By applying this, it is possible to manufacture an element in which both the anode and the cathode are transparent.
  • the light emitting layer is a layer that emits light after excitons are generated by recombination of holes and electrons injected from each of the anode and the cathode, and the light emitting layer contains an organic light emitting dopant material and a host.
  • the first host and the second host are used.
  • the compound represented by the general formula (1) as the first host one kind may be used, or two or more kinds may be used.
  • one kind of carbazole compound or indolocarbazole compound represented by the general formulas (2) to (5) as the second host may be used, or two or more kinds may be used.
  • one or a plurality of known host materials may be used in combination, but the amount used may be 50 wt% or less, preferably 25 wt% or less, based on the total amount of the host materials. Other materials may be used as hosts.
  • the first host and the second host can be vapor-deposited from different vapor deposition sources, or the first host and the second host can be vapor-deposited from one vapor deposition source at the same time by premixing them before vapor deposition to form a premixture. ..
  • the 50% weight loss temperature is the temperature at which the weight is reduced by 50% when the temperature is raised from room temperature to 550 ° C at a rate of 10 ° C per minute in TG-DTA measurement under nitrogen airflow decompression (50 Pa). .. It is considered that vaporization by evaporation or sublimation occurs most actively in the vicinity of this temperature.
  • the difference between the 50% weight loss temperature of the first host and the second host is preferably within 20 ° C, more preferably within 15 ° C.
  • a known method such as pulverization and mixing can be adopted, but it is desirable to mix as uniformly as possible.
  • the phosphorescent dopant When a phosphorescent dopant is used as the luminescent dopant material, the phosphorescent dopant contains an organic metal complex containing at least one metal selected from ruthenium, rhodium, palladium, silver, rhenium, osmium, iridium, platinum and gold. What to do is good. Specifically, the iridium complexes described in J.Am.Chem.Soc.2001,123,4304 and JP-A-2013-53051 are preferably used, but are not limited thereto.
  • the phosphorescent dopant material only one type may be contained in the light emitting layer, or two or more types may be contained.
  • the content of the phosphorescent dopant material is preferably 0.1 to 30 wt% and more preferably 1 to 20 wt% with respect to the host material.
  • the phosphorescent dopant material is not particularly limited, but specific examples include the following.
  • the fluorescent light emitting dopant is not particularly limited, and is, for example, a benzoxazole derivative, a benzothiazole derivative, a benzoimidazole derivative, a styrylbenzene derivative, a polyphenyl derivative, a diphenylbutadiene derivative, or a tetraphenyl.
  • polymer compounds such as polyphenylene and polyphenylene vinylene, and organic silane derivatives.
  • Preferred are condensed aromatic derivatives, styryl derivatives, diketopyrrolopyrrole derivatives, oxazine derivatives, pyromethene metal complexes, transition metal complexes, or lanthanoid complexes, and more preferably naphthalene, pyrene, chrysene, triphenylene, benzo [c] phenanthrene.
  • the fluorescent light emitting dopant material only one kind may be contained in the light emitting layer, or two or more kinds may be contained.
  • the content of the fluorescent dopant material is preferably 0.1 to 20%, more preferably 1 to 10% with respect to the host material.
  • the heat-activated delayed fluorescence light-emitting dopant is not particularly limited, but is described in a metal complex such as a tin complex or a copper complex, or as described in WO2011 / 070963.
  • the thermally activated delayed fluorescence dopant material is not particularly limited, but specific examples include the following.
  • the thermally activated delayed fluorescent dopant material may contain only one type or two or more types in the light emitting layer. Further, the thermally activated delayed fluorescence dopant may be mixed with a phosphorescence light emitting dopant or a fluorescence emission dopant. The content of the thermally activated delayed fluorescent dopant material is preferably 0.1 to 50%, more preferably 1 to 30% with respect to the host material.
  • the injection layer is a layer provided between the electrode and the organic layer in order to reduce the driving voltage and improve the emission brightness.
  • the injection layer can be provided as needed.
  • the hole blocking layer has the function of an electron transporting layer in a broad sense, and is made of a hole blocking material having a function of transporting electrons and a significantly small ability to transport holes. It is possible to improve the recombination probability of electrons and holes in the light emitting layer by blocking the above.
  • a known hole blocking layer material can be used for the hole blocking layer, but it is preferable to contain a compound represented by the general formula (1).
  • the electron blocking layer has a function of a hole transporting layer in a broad sense, and by blocking electrons while transporting holes, the probability of recombination of electrons and holes in the light emitting layer can be improved. ..
  • the material of the electron blocking layer a known electron blocking layer material can be used, and a hole transporting layer material described later can be used as needed.
  • the film thickness of the electron blocking layer is preferably 3 to 100 nm, more preferably 5 to 30 nm.
  • the exciton blocking layer is a layer for preventing excitons generated by the recombination of holes and electrons in the light emitting layer from diffusing into the charge transport layer, and the exciton is inserted by inserting this layer. It is possible to efficiently confine it in the light emitting layer, and it is possible to improve the light emitting efficiency of the element.
  • the exciton blocking layer can be inserted between two adjacent light emitting layers in an element in which two or more light emitting layers are adjacent to each other.
  • exciton blocking layer As the material of the exciton blocking layer, a known exciton blocking layer material can be used. For example, 1,3-dicarbazolylbenzene (mCP) and bis (2-methyl-8-quinolinolato) -4-phenylphenylatoaluminum (III) (BAlq) can be mentioned.
  • mCP 1,3-dicarbazolylbenzene
  • BAlq bis (2-methyl-8-quinolinolato) -4-phenylphenylatoaluminum
  • the hole transport layer is made of a hole transport material having a function of transporting holes, and the hole transport layer may be provided as a single layer or a plurality of layers.
  • the hole transport material has either injection or transport of holes or an electron barrier property, and may be either an organic substance or an inorganic substance. Any compound can be selected and used for the hole transport layer from conventionally known compounds. Examples of such hole transporting materials include porphyrin derivatives, arylamine derivatives, triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives and pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, and amino-substituted chalcone derivatives.
  • the electron transport layer is made of a material having a function of transporting electrons, and the electron transport layer may be provided with a single layer or a plurality of layers.
  • the electron transporting material (which may also serve as a hole blocking material) may have a function of transmitting electrons injected from the cathode to the light emitting layer.
  • any conventionally known compound can be selected and used.
  • a polycyclic aromatic derivative such as naphthalene, anthracene or phenanthroline, tris (8-quinolinolate) aluminum (III).
  • Derivatives phosphine oxide derivatives, nitro-substituted fluorene derivatives, diphenylquinone derivatives, thiopyrandioxide derivatives, carbodiimide, fluorenylidene methane derivatives, anthracinodimethane and antron derivatives, bipyridine derivatives, quinoline derivatives, oxadiazole derivatives, benzoimidazole Derivatives, benzothiazole derivatives, indolocarbazole derivatives and the like can be mentioned. Further, a polymer material in which these materials are introduced into a polymer chain or these materials are used as a polymer main chain can also be used.
  • Example 1 Each thin film was laminated with a vacuum degree of 4.0 ⁇ 10 -5 Pa by a vacuum vapor deposition method on a glass substrate on which an anode made of ITO having a film thickness of 110 nm was formed.
  • HAT-CN was formed on the ITO to a thickness of 25 nm as a hole injection layer, and then NPD was formed to a thickness of 30 nm as a hole transport layer.
  • HT-1 was formed to a thickness of 10 nm as an electron blocking layer.
  • compound 1-1 as the first host, compound 2-4 as the second host, and Ir (ppy) 3 as the light emitting dopant are co-deposited from different vapor deposition sources to form a light emitting layer with a thickness of 40 nm. did. At this time, co-deposited under the vapor deposition conditions where the concentration of Ir (ppy) 3 was 10 wt% and the weight ratio between the first host and the second host was 30:70.
  • ET-1 was formed to a thickness of 20 nm as an electron transport layer.
  • LiF was formed on the electron transport layer as an electron injection layer to a thickness of 1 nm.
  • Al was formed as a cathode on the electron injection layer to a thickness of 70 nm to fabricate an organic EL device.
  • Example 1 an organic EL device was produced in the same manner as in Example 1 except that the compounds shown in Tables 1 and 2 were used as the first host and the second host.
  • Example 89-96 The first host and the second host were mixed in advance to form a premixture, which was then co-deposited from one vapor deposition source.
  • the organic EL is the same as in Example 1 except that the premix obtained by weighing the first host (0.30 g) and the second host (0.70 g) and mixing them while grinding in a mortar was used. The element was created.
  • the evaluation results of the produced organic EL device are shown in Tables 1 to 4.
  • the brightness, drive voltage, and luminous efficiency are the values when the drive current is 20 mA / cm 2 and are the initial characteristics.
  • LT70 is the time required for the initial brightness to decay to 70%, and represents the life characteristic.
  • Example 1 an organic EL device was produced in the same manner as in Example 1 except that Compound 1-1 was used alone as a host.
  • the thickness of the light emitting layer and the concentration of the light emitting dopant are the same as in Example 1.
  • Comparative Examples 2 to 15 An organic EL device was produced in the same manner as in Comparative Example 1 except that the compounds shown in Table 5 were used alone as the host.
  • Example 1 Comparative Examples 16 to 24 In Example 1, compound A is used as the first host, and compound 2-5, compound 2-6, compound 3-24, compound 3-33, compound 3-45, compound 4-3, compound 4-3, compound as the second host.
  • An organic EL device was produced in the same manner as in Example 1 except that 4-22, compound 5-3, or compound 5-19 was used.
  • Comparative Examples 25 to 33 an organic EL device was produced in the same manner as in Comparative Examples 16 to 24 except that Compound B was used as the first host.
  • Comparative Examples 34 to 42 an organic EL device was produced in the same manner as in Comparative Examples 16 to 24 except that Compound C was used as the first host.
  • Tables 5 to 6 show the evaluation results of the manufactured organic EL device.
  • Examples 1 to 96 have improved power efficiency and life characteristics, and exhibit good characteristics.
  • Example 97 Each thin film was laminated with a vacuum degree of 4.0 ⁇ 10 -5 Pa by a vacuum vapor deposition method on a glass substrate on which an anode made of ITO having a film thickness of 110 nm was formed.
  • HAT-CN was formed on the ITO to a thickness of 25 nm as a hole injection layer, and then NPD was formed to a thickness of 45 nm as a hole transport layer.
  • HT-1 was formed to a thickness of 10 nm as an electron blocking layer.
  • compound 1-1 as the first host, compound 2-4 as the second host, and Ir (piq) 2 acac as the light emitting dopant were co-deposited from different vapor deposition sources to form a light emitting layer with a thickness of 40 nm. Formed. At this time, co-deposited under the vapor deposition conditions where the concentration of Ir (piq) 2 acac was 6.0 wt%.
  • ET-1 was formed to a thickness of 37.5 nm as an electron transport layer.
  • LiF was formed on the electron transport layer as an electron injection layer to a thickness of 1 nm.
  • Al was formed as a cathode on the electron injection layer to a thickness of 70 nm to fabricate an organic EL device.
  • Example 97 an organic EL device was produced in the same manner as in Example 97 except that the compounds shown in Tables 7 to 9 were used as the first host and the second host.
  • Tables 7 to 9 show the evaluation results of the manufactured organic EL device.
  • LT95 is the time required for the initial brightness to be attenuated to 95%, and represents the life characteristic.
  • Example 97 an organic EL device was produced in the same manner as in Example 97 except that Compound 1-1 was used alone as a host.
  • the thickness of the light emitting layer and the concentration of the light emitting dopant are the same as in Example 97.
  • Comparative Examples 44 to 57 An organic EL device was produced in the same manner as in Comparative Example 43 except that the compounds shown in Table 10 were used alone as the host.
  • Example 97 Comparative Examples 58-66
  • Compound A is used as the first host, and Compound 2-5, Compound 2-6, Compound 3-24, Compound 3-33, Compound 3-45, Compound 4-3, and Compound 4-3 are used as the second host.
  • An organic EL device was produced in the same manner as in Example 97 except that compound 5-3 or compound 5-19 was used.
  • Comparative Examples 67-75 In Comparative Examples 58 to 66, organic EL devices were produced in the same manner as in Comparative Examples 58 to 66 except that Compound B was used as the first host.
  • Comparative Examples 76-84 In Comparative Examples 58 to 66, organic EL devices were produced in the same manner as in Comparative Examples 58 to 66 except that Compound C was used as the first host.
  • Tables 10 to 11 show the evaluation results of the manufactured organic EL device.
  • Examples 97 to 182 have improved power efficiency and life characteristics, and exhibit good characteristics.
  • the organic EL device of the present invention can be driven at a low voltage, and can achieve high efficiency and long life.

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