WO2018207135A1 - 有機化合物、発光素子、発光装置、電子機器、表示装置及び照明装置 - Google Patents
有機化合物、発光素子、発光装置、電子機器、表示装置及び照明装置 Download PDFInfo
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- WO2018207135A1 WO2018207135A1 PCT/IB2018/053271 IB2018053271W WO2018207135A1 WO 2018207135 A1 WO2018207135 A1 WO 2018207135A1 IB 2018053271 W IB2018053271 W IB 2018053271W WO 2018207135 A1 WO2018207135 A1 WO 2018207135A1
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D495/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms
- C07D495/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms in which the condensed system contains two hetero rings
- C07D495/04—Ortho-condensed systems
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D493/00—Heterocyclic compounds containing oxygen atoms as the only ring hetero atoms in the condensed system
- C07D493/02—Heterocyclic compounds containing oxygen atoms as the only ring hetero atoms in the condensed system in which the condensed system contains two hetero rings
- C07D493/04—Ortho-condensed systems
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
- C07F7/02—Silicon compounds
- C07F7/08—Compounds having one or more C—Si linkages
- C07F7/0803—Compounds with Si-C or Si-Si linkages
- C07F7/081—Compounds with Si-C or Si-Si linkages comprising at least one atom selected from the elements N, O, halogen, S, Se or Te
- C07F7/0812—Compounds with Si-C or Si-Si linkages comprising at least one atom selected from the elements N, O, halogen, S, Se or Te comprising a heterocyclic ring
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/40—Organosilicon compounds, e.g. TIPS pentacene
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Definitions
- One embodiment of the present invention relates to a light-emitting element, a display module, a lighting module, a display device, a light-emitting device, an electronic device, and a lighting device.
- a light-emitting element a display module, a lighting module, a display device, a light-emitting device, an electronic device, and a lighting device.
- the technical field of one embodiment of the invention disclosed in this specification and the like relates to an object, a method, or a manufacturing method.
- one embodiment of the present invention relates to a process, a machine, a manufacture, or a composition (composition of matter).
- the technical field of one embodiment of the present invention disclosed in this specification more specifically includes a semiconductor device, a display device, a liquid crystal display device, a light-emitting device, a lighting device, a power storage device, a memory device, an imaging device, A driving method or a manufacturing method thereof can be given as an example.
- the organic EL element has a function-separated configuration in which a plurality of functions are assigned to different substances, but among them, there is a demand for light emitting materials, particularly light emission efficiency that affects power consumption, and light emission color for improving display quality. Is big.
- Patent Document 1 discloses an organic compound having a naphthobisbenzofuran skeleton.
- An object of one embodiment of the present invention is to provide a novel organic compound. Another object is to provide an organic compound that emits light with favorable chromaticity. Alternatively, an object is to provide an organic compound that exhibits blue light emission with favorable chromaticity. Alternatively, an object is to provide an organic compound with favorable light emission efficiency. Alternatively, an object is to provide an organic compound with high carrier transportability. Another object is to provide a highly reliable organic compound.
- Another object of one embodiment of the present invention is to provide a novel light-emitting element. Another object is to provide a light-emitting element with favorable light emission efficiency. Another object is to provide a light-emitting element that emits light with favorable chromaticity. Another object is to provide a light-emitting element that emits blue light with favorable chromaticity. Another object is to provide a light-emitting element with favorable lifetime. Another object is to provide a light-emitting element with low driving voltage.
- the present invention should solve any one of the above-mentioned problems.
- One embodiment of the present invention is an organic compound represented by General Formula (G1) below.
- A is a group represented by the following general formula (g1)
- B is a substituted or unsubstituted naphthobisbenzofuran skeleton, a substituted or unsubstituted naphthobisbenzothiophene skeleton, and a substituted or unsubstituted naphthobenzo. It represents any one of the furanobenzothiophene skeleton.
- Q is 1 or 2.
- Ar 1 represents a substituted or unsubstituted aromatic hydrocarbon group having 6 to 25 carbon atoms
- Ar 2 represents a hydrocarbon group having 1 to 6 carbon atoms and a substituted or unsubstituted carbon number.
- R 1 to R 8 are each independently hydrogen, a hydrocarbon group having 1 to 10 carbon atoms, a cyclic hydrocarbon group having 3 to 10 carbon atoms, or a substituted or unsubstituted aromatic hydrocarbon having 6 to 14 carbon atoms.
- ⁇ 1 to ⁇ 4 are each independently a substituted or unsubstituted divalent aromatic hydrocarbon group having 6 to 25 carbon atoms.
- L, m, n and p each independently represent an integer of 0 to 2.
- Another embodiment of the present invention is an organic compound in which the Ar 2 is an aromatic hydrocarbon group having 6 to 12 carbon atoms in the above structure.
- Another embodiment of the present invention is an organic compound in which the p is 0 in the above structure.
- Another embodiment of the present invention is an organic compound having the above structure, in which the p is 1 and the ⁇ 4 is a phenylene group.
- Another embodiment of the present invention is the organic compound according to the above structure, wherein l, m, and n are each independently 0 or 1, and ⁇ 1 to ⁇ 3 are phenylene groups.
- Another embodiment of the present invention is an organic compound in which 1 is 0 in the above structure.
- Another embodiment of the present invention is an organic compound in which, in the above structure, the B is any one of skeletons represented by the following general formulas (B1) to (B4).
- any one or two of R 10 to R 21 represent a group represented by the general formula (g1), and the rest are each independently hydrogen and a group having 1 to 10 carbon atoms. It represents any one of a hydrocarbon group, a cyclic hydrocarbon group having 3 to 10 carbon atoms, and a substituted or unsubstituted aromatic hydrocarbon group having 6 to 14 carbon atoms.
- any one or 2 of R 30 to R 41 represents a group represented by the general formula (g1), and the rest are each independently hydrogen, having 1 to 10 carbon atoms.
- any one or 2 of R 50 to R 61 represents a group represented by the general formula (g1), and the rest are each independently hydrogen, having 1 to 10 carbon atoms. It represents any one of a hydrocarbon group, a cyclic hydrocarbon group having 3 to 10 carbon atoms, and a substituted or unsubstituted aromatic hydrocarbon group having 6 to 14 carbon atoms.
- any one or 2 of R 70 to R 81 represents a group represented by the general formula (g1), and the rest are each independently hydrogen, having 1 to 10 carbon atoms. It represents any one of a hydrocarbon group, a cyclic hydrocarbon group having 3 to 10 carbon atoms, and a substituted or unsubstituted aromatic hydrocarbon group having 6 to 14 carbon atoms.
- Another embodiment of the present invention is an organic compound in which, in the above structure, the B is any one of the skeletons represented by the general formulas (B1) to (B3).
- Another embodiment of the present invention is an organic compound in the above structure, in which the B is a skeleton represented by the following general formula (B1).
- X 2 and X 3 each independently represent an oxygen atom or a sulfur atom.
- R 10 to R 21 each represents a group represented by 1 or 2 of the above general formula (g1), and the rest each independently represents hydrogen, a hydrocarbon group having 1 to 10 carbon atoms, or 3 to 3 carbon atoms. It represents any one of 10 cyclic hydrocarbon groups and a substituted or unsubstituted aromatic hydrocarbon group having 6 to 14 carbon atoms.
- any one or two of R 11 , R 12 , R 17, and R 18 in the general formula (B1) are represented by the general formula (g1).
- q in the general formula (G1) is 2, and R 11 or R 12 and R 17 or R 18 in the general formula (B1) are the above general formula. It is an organic compound which is a group represented by (g1).
- Another embodiment of the present invention is that, in the above structure, q in the general formula (G1) is 2, and R 11 and R 17 in the general formula (B1) are represented by the general formula (g1). It is an organic compound that is a group.
- Another embodiment of the present invention is that, in the above structure, q in the general formula (G1) is 2, and R 12 and R 18 in the general formula (B1) are represented by the general formula (g1). It is an organic compound that is a group.
- Another embodiment of the present invention is an organic compound having the above structure, in which the B is a skeleton represented by the following general formula (B2).
- X 2 and X 3 each independently represent an oxygen atom or a sulfur atom.
- R 30 to R 41 each represents a group represented by 1 or 2 of the above general formula (g1), and the rest each independently represents hydrogen, a hydrocarbon group having 1 to 10 carbon atoms, or 3 to 3 carbon atoms. It represents any one of 10 cyclic hydrocarbon groups and a substituted or unsubstituted aromatic hydrocarbon group having 6 to 14 carbon atoms.
- any one or two of R 31 , R 32 , R 37 and R 38 in the general formula (B2) are represented by the general formula (g1).
- Another embodiment of the present invention is that in the above structure, q in the general formula (G1) is 2, and R 31 or R 32 and R 37 or R 38 in the general formula (B2) are the above general formulas. It is an organic compound which is a group represented by (g1).
- Another embodiment of the present invention is that, in the above structure, q in the general formula (G1) is 2, and R 31 and R 37 in the general formula (B2) are represented by the general formula (g1). It is an organic compound that is a group.
- Another embodiment of the present invention is that, in the above structure, q in the general formula (G1) is 2, and R 32 and R 38 in the general formula (B2) are represented by the general formula (g1). It is an organic compound that is a group.
- Another embodiment of the present invention is an organic compound in the above structure, in which the B is a skeleton represented by the following general formula (B3).
- X 2 and X 3 each independently represent an oxygen atom or a sulfur atom.
- R 50 to R 61 each represents 1 or 2 of the group represented by the general formula (G1), and the rest each independently represents hydrogen, a hydrocarbon group having 1 to 10 carbon atoms, or 3 to 3 carbon atoms. It represents any one of 10 cyclic hydrocarbon groups and a substituted or unsubstituted aromatic hydrocarbon group having 6 to 14 carbon atoms.
- any one or two of R 51 , R 52 , R 57, and R 58 in the general formula (B3) are represented by the general formula (g1).
- q in the general formula (G1) is 2, and R 51 or R 52 and R 57 or R 58 in the general formula (B3) are the above general formulas. It is an organic compound which is a group represented by (g1).
- Another embodiment of the present invention is that, in the above structure, q in the general formula (G1) is 2, and R 51 and R 57 in the general formula (B3) are represented by the general formula (g1). It is an organic compound that is a group.
- Another embodiment of the present invention is that, in the above structure, q in the general formula (G1) is 2, and R 52 and R 58 in the general formula (B3) are represented by the general formula (g1). It is an organic compound that is a group.
- Another embodiment of the present invention is an organic compound in which X 2 and X 3 are oxygen atoms in the above structure.
- Another embodiment of the present invention is an organic compound having a molecular weight of 1300 or less in the above structure.
- Another embodiment of the present invention is an organic compound having a molecular weight of 1000 or less in the above structure.
- Another embodiment of the present invention is a light-emitting element including the organic compound having the above structure.
- Another embodiment of the present invention is a light-emitting device including the light-emitting element having the above structure and a transistor or a substrate.
- Another embodiment of the present invention is an electronic device including the light-emitting device having the above structure and a sensor, an operation button, a speaker, or a microphone.
- Another embodiment of the present invention is a lighting device including the light-emitting device having the above structure and a housing.
- another embodiment of the present invention is a light-emitting device including the light-emitting element having the above structure, a substrate, and a transistor.
- another embodiment of the present invention is an electronic device including the light-emitting device having the above structure and a sensor, an operation button, a speaker, or a microphone.
- another embodiment of the present invention is a lighting device including the light-emitting device having the above structure and a housing.
- the light-emitting device in this specification includes an image display device using a light-emitting element.
- a connector for example, an anisotropic conductive film or TCP (Tape Carrier Package) attached to a light emitting element, a module provided with a printed wiring board at the end of TCP, or a COG (Chip On Glass) method for a light emitting element.
- a module on which an IC (integrated circuit) is directly mounted is included in the light emitting device.
- a lighting fixture or the like may include a light emitting device.
- a novel organic compound can be provided.
- an organic compound exhibiting light emission with favorable chromaticity can be provided.
- an organic compound that exhibits blue light emission with favorable chromaticity can be provided.
- an organic compound with favorable emission efficiency can be provided.
- an organic compound with high carrier transportability can be provided.
- an organic compound with favorable reliability can be provided.
- a novel light-emitting element can be provided.
- a light-emitting element with favorable light emission efficiency can be provided.
- a light-emitting element that emits light with favorable chromaticity can be provided.
- a light-emitting element that emits blue light with favorable chromaticity can be provided.
- a light-emitting element with favorable lifetime can be provided.
- a light-emitting element with low driving voltage can be provided.
- a light-emitting device, an electronic device, and a display device with low power consumption can be provided.
- a highly reliable light-emitting device, electronic device, and display device can be provided.
- a light-emitting device, an electronic device, and a display device each having favorable display quality can be provided.
- FIG. 10A and 10B illustrate an example of a method for manufacturing a light-emitting element.
- 1 is a conceptual diagram of an active matrix light-emitting device.
- 1 is a conceptual diagram of an active matrix light-emitting device.
- 1 is a conceptual diagram of a passive matrix light emitting device.
- FIG. 10 illustrates an electronic device.
- FIG. 10 illustrates an electronic device.
- FIG. 10 illustrates an electronic device.
- FIG. 10 illustrates an electronic device.
- FIG. 10 illustrates an electronic device.
- FIG. 10 illustrates an electronic device.
- FIG. 10 illustrates an electronic device.
- the luminance-voltage characteristics of the light-emitting element 1 and the comparative light-emitting element 1. 4 shows current-voltage characteristics of the light-emitting element 1 and the comparative light-emitting element 1.
- the external quantum efficiency-luminance characteristics of the light-emitting element 1 and the comparative light-emitting element 1. 2 shows emission spectra of the light-emitting element 1 and the comparative light-emitting element 1.
- FIG. 9 shows an emission spectrum of the light-emitting element 2.
- 1 H NMR spectrum of 3,10 mFLPA2Nbf (IV). The absorption spectrum and emission spectrum in the toluene solution of 3,10mFLPA2Nbf (IV).
- Luminance-current density characteristics of the light-emitting element 3. Current efficiency-luminance characteristics of the light-emitting element 3. Luminance-voltage characteristics of the light-emitting element 3. The current-voltage characteristic of the light emitting element 3. The external quantum efficiency-luminance characteristics of the light-emitting element 3. The emission spectrum of the light-emitting element 3. The normalized luminance-time change characteristic of the light-emitting element 3. The normalized luminance-time change characteristic of the light-emitting element 1.
- the organic compound of one embodiment of the present invention is an organic compound represented by the following general formula (G1).
- B represents any one of a substituted or unsubstituted naphthobisbenzofuran skeleton, a substituted or unsubstituted naphthbisbisbenzothiophene skeleton, and a substituted or unsubstituted naphthobenzofuranobenzothiophene skeleton. ing.
- A is a group represented by the following general formula (g1), and 1 or 2 of A is bonded to the skeleton B (that is, q is 1 or 2).
- Ar 1 represents a substituted or unsubstituted aromatic hydrocarbon group having 6 to 25 carbon atoms
- Ar 2 represents a hydrocarbon group having 1 to 6 carbon atoms, a substituted or unsubstituted carbon number.
- R 1 to R 8 are each independently hydrogen, a hydrocarbon group having 1 to 10 carbon atoms, a cyclic hydrocarbon group having 3 to 10 carbon atoms, or a substituted or unsubstituted aromatic hydrocarbon having 6 to 14 carbon atoms. Represents any one of the groups.
- ⁇ 1 , ⁇ 2 , ⁇ 3, and ⁇ 4 are each independently a substituted or unsubstituted divalent aromatic hydrocarbon group having 6 to 25 carbon atoms, and l, m , N and p each independently take a numerical value of 0, 1 or 2.
- An organic compound having a substituted or unsubstituted naphthobisbenzofuran skeleton or a substituted or unsubstituted naphthobisbenzothiophene skeleton is a very useful skeleton as a luminophore of a light-emitting element. Since the organic compound has high emission efficiency and exhibits good blue light emission, a light-emitting element using the organic compound can be a blue light-emitting element with high emission efficiency.
- Various materials have been developed for blue fluorescent materials, but since this organic compound emits blue light with very good chromaticity, ITU-R BT is an international standard for an ultra-wide color gamut that conforms to 8K displays. . It is a very promising material as a blue light emitting material for expressing a color gamut covering the 2020 standard.
- a light-emitting element using an organic compound having a special arylamine such as the above general formula (g1) in these skeletons can be a light-emitting element having further excellent characteristics. .
- a structure in which ⁇ 1 , ⁇ 2 , ⁇ 3, and ⁇ 4 are each independently 0 in the general formula (g1) described above is a preferable structure because the number of synthesis steps is small and the sublimation temperature is low.
- Ar 1 and Ar 2 are preferably aromatic hydrocarbon groups because of their high resistance to excitation, and more preferably substituted or unsubstituted phenyl groups.
- Ar 2 is preferably a substituted or unsubstituted aromatic hydrocarbon group because the synthesis is simple.
- Ar 2 is preferably a hydrocarbon group because it is more soluble in an organic solvent and can be easily purified. Moreover, it becomes easy to form a film by a wet method, which is preferable.
- q is preferably 2 because the quantum yield is high, and q is preferably 1 because the sublimation temperature is low.
- the two groups represented by the general formula (g1) bonded to B may have different structures.
- the general formula (g1) has a substituent and the substituent is a hydrocarbon group, it is preferable because the molecule becomes three-dimensional, the sublimation temperature is lowered, and an excimer is hardly formed. Moreover, since it becomes easy to melt
- the sublimation temperature includes the meaning of the evaporation temperature.
- Ar 1 in the general formula (g1) represents a substituted or unsubstituted aromatic hydrocarbon group having 6 to 25 carbon atoms.
- the substituted or unsubstituted aromatic hydrocarbon group having 6 to 25 carbon atoms include phenyl group, biphenyl group, terphenyl group, naphthyl group, fluorenyl group, dimethylfluorenyl group, and spirofluorenyl.
- Ar 1 is shown in the following structural formulas (Ar-100) to (Ar-119) and (Ar-130) to (Ar-140). These are further substituted with a hydrocarbon group having 1 to 10 carbon atoms, a cyclic hydrocarbon group having 3 to 10 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 14 carbon atoms, a trimethylsilyl group, or the like. You may have.
- a phenyl group is linked as in (Ar-100) to (Ar-108) because the conjugation is difficult to extend and the emission wavelength is short.
- a six-membered ring such as a benzene ring, a naphthalene ring, a fluorene ring or the like, or a six-membered condensed hydrocarbon or a phenanthrene ring.
- Ar 2 in the general formula (g1) represents any one of a hydrocarbon group having 1 to 6 carbon atoms and an aromatic hydrocarbon group having 6 to 25 carbon atoms.
- the hydrocarbon group having 1 to 6 carbon atoms include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a tertiary butyl group, a pentyl group, and a hexyl group.
- the aromatic hydrocarbon group having 6 to 25 carbon atoms is the same as Ar 1 .
- ⁇ 1 to ⁇ 4 in the general formula (g1) each independently represents a substituted or unsubstituted divalent aromatic hydrocarbon group having 6 to 25 carbon atoms, specifically, a phenylene group, a biphenylene group, Examples include a terphenylene group, a naphthylene group, a fluorenediyl group, and a dimethyl fluorenediyl group.
- two connected ⁇ s may be groups having different structures.
- ⁇ 1 to ⁇ 4 groups represented by the following structural formulas (Ar-1) to (Ar-33) can be given. These further have a substituent such as a hydrocarbon group having 1 to 10 carbon atoms, a cyclic hydrocarbon group having 3 to 10 carbon atoms, or a substituted or unsubstituted aromatic hydrocarbon group having 6 to 14 carbon atoms. You may do it.
- ⁇ 1 to ⁇ 4 are a group in which several phenylene groups and several phenylene groups are connected as in (Ar-1) to (Ar-11), the conjugation is difficult to extend, and the singlet excitation level is kept high. It is preferable because it sag. In particular, a configuration including a metaphenylene group is a preferable embodiment because the effect is remarkable. Moreover, since a molecule
- the substituted or unsubstituted naphthobisbenzofuran skeleton or the substituted or unsubstituted naphthobisbenzothiophene skeleton represented by B is represented by the following general formulas (B1) to (B4). It is preferably any one of the skeletons represented by
- ⁇ 1 , ⁇ 2 , ⁇ 3 and ⁇ 4 may be connected to different substituents.
- naphthylene and phenylene are linked.
- X 2 and X 3 each independently represent an oxygen atom or a sulfur atom. These two atoms are preferably the same atom for the convenience of synthesis.
- the structure in which both are oxygen atoms is easy to synthesize, has a high singlet excitation level, can emit light with a shorter wavelength, and has a high light emission yield. preferable.
- X 2 and X 3 emit light with a shorter wavelength as the number of oxygen atoms increases, and emit light with a longer wavelength as the number of sulfur atoms increases. Therefore, X 2 and X 3 can be arbitrarily set according to the target singlet excitation level or emission wavelength. The number of oxygen or sulfur atoms can be selected.
- the skeleton represented by B in the general formula (G1) tends to have a longer wavelength in the order of the general formula (B2), the general formula (B4), the general formula (B1), and the general formula (B3). Therefore, it may be selected from these according to the target emission color.
- the compound represented by the general formula (B2) is preferable.
- a compound represented by the general formula (B3) is preferable.
- any one or 2 of R 10 to R 21 is a group represented by the general formula (g1). Any one of hydrogen, a hydrocarbon group having 1 to 10 carbon atoms, a cyclic hydrocarbon group having 3 to 10 carbon atoms, and a substituted or unsubstituted aromatic hydrocarbon group having 6 to 14 carbon atoms. Represents one.
- the group represented by the general formula (g1) is preferably any one of R 11 , R 12 , R 17 and R 18 out of R 10 to R 21 because synthesis is simple. .
- any two of R 10 to R 21 are groups represented by the general formula (g1) ( That is, when q in General Formula (G1) is 2, R 11 or R 12 and R 17 or R 18 are preferably a group represented by General Formula (g1) from the viewpoint of ease of synthesis. .
- R 11 and R 17 are preferably groups represented by the general formula (g1) from the viewpoint of obtaining long-wavelength light emission
- R 12 and R 18 are represented by the general formula (g1).
- the group is preferable because it can emit light at a short wavelength, has good emission quantum efficiency, and has high reliability when emitting light.
- any one or 2 of R 30 to R 41 is a group represented by the general formula (g1). Any one of hydrogen, a hydrocarbon group having 1 to 10 carbon atoms, a cyclic hydrocarbon group having 3 to 10 carbon atoms, and a substituted or unsubstituted aromatic hydrocarbon group having 6 to 14 carbon atoms. Represents one.
- the group represented by the general formula (g1) is any one or two of R 31 , R 32 , R 37 and R 38 among R 30 to R 41 , it is preferable because the synthesis is simple. .
- any two of R 30 to R 41 are groups represented by the general formula (g1) ( That is, when q in General Formula (G1) is 2, R 31 or R 32 and R 37 or R 38 are preferably groups represented by General Formula (g1) from the viewpoint of ease of synthesis. .
- R 31 and R 37 are preferably groups represented by the above general formula (g1) from the viewpoint of obtaining long-wavelength emission
- R 32 and R 38 are represented by the above general formula (g1). It is preferable that short wavelength light emission is obtained, the quantum efficiency of light emission is good, and the reliability when light is emitted is good.
- any one or 2 of R 50 to R 61 is a group represented by the general formula (g1). Any one of hydrogen, a hydrocarbon group having 1 to 10 carbon atoms, a cyclic hydrocarbon group having 3 to 10 carbon atoms, and a substituted or unsubstituted aromatic hydrocarbon group having 6 to 14 carbon atoms. Represents one.
- the single bond is preferably any one or two of R 51 , R 52 , R 57 and R 58 among R 50 to R 61 .
- any two of R 50 to R 61 are groups represented by the general formula (g1) ( That is, when q in General Formula (G1) is 2, R 51 or R 52 and R 57 or R 58 are preferably a group represented by General Formula (g1) from the viewpoint of ease of synthesis. .
- R 51 and R 57 are preferably groups represented by the above general formula (g1) from the viewpoint of obtaining long-wavelength light emission
- R 52 and R 58 are represented by the above general formula (g1). It is preferable that short wavelength light emission is obtained, the quantum efficiency of light emission is good, and the reliability when light is emitted is good.
- any one or 2 of R 70 to R 81 is a group represented by the general formula (g1). Any one of hydrogen, a hydrocarbon group having 1 to 10 carbon atoms, a cyclic hydrocarbon group having 3 to 10 carbon atoms, and a substituted or unsubstituted aromatic hydrocarbon group having 6 to 14 carbon atoms. Represents one.
- the group represented by the general formula (g1) is any one or two of R 71 , R 72 , R 77 and R 78 among R 70 to R 81 .
- any two of R 70 to R 81 are a group represented by the general formula (g1) ( That is, when q in the above general formula (G1) is 2, R 71 or R 72 and R 77 or R 78 is a group represented by the above general formula (g1) for easy synthesis.
- R 71 and R 78 are preferably groups represented by the general formula (g1) from the viewpoint of obtaining long-wavelength emission
- R 72 and R 77 are represented by the general formula (g1).
- Such a group is preferable because it can emit light at a short wavelength, has good emission quantum efficiency, and has high reliability when emitted.
- the molecular weight of the organic compound represented by the general formula (G1) is preferably 1300 or less, more preferably 1000 or less, considering sublimation properties. In view of the film quality, the molecular weight is preferably 650 or more.
- the substituent is a hydrocarbon group having 1 to 10 carbon atoms, a cyclic hydrocarbon group having 3 to 10 carbon atoms, or 6 to 6 carbon atoms. It is preferably any one of 14 aromatic hydrocarbon groups and trimethylsilyl groups.
- Examples of the hydrocarbon group having 1 to 10 carbon atoms that can be selected as the substituent represented by R 1 to R 81 or the substituent further bonded to the substituent include a methyl group, an ethyl group, a propyl group, Examples include isopropyl group, butyl group, tertiary butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, icosyl group and the like.
- Examples of the cyclic hydrocarbon group having 3 to 10 carbon atoms include a cyclopropyl group and a cyclohexyl group.
- the aromatic hydrocarbon group having 6 to 14 carbon atoms examples include phenyl group, biphenyl group, naphthyl group, phenanthryl group, anthryl group, and fluorenyl group.
- the diarylamino group having 12 to 32 carbon atoms it is more preferable that the aryl group is independently an aromatic hydrocarbon group having 6 to 16 carbon atoms.
- the aromatic hydrocarbon group examples include a phenyl group, a biphenyl group, a naphthyl group, a phenanthryl group, an anthryl group, a fluorenyl group, and a naphthylphenyl group.
- the substituent represented by R 1 to R 81 may further have an aliphatic hydrocarbon group having 1 to 6 carbon atoms, an alicyclic hydrocarbon group having 3 to 6 carbon atoms, or the like as a substituent. good.
- ⁇ 1 , ⁇ 2 , ⁇ 3, and ⁇ 4 are different divalent aromatic carbonizations.
- a hydrogen group may be linked.
- n is 2 and ⁇ 3 is connected to paraphenylene and metaphenylene.
- B represents a substituted or unsubstituted naphthobisbenzofuran skeleton, a substituted or unsubstituted naphthobisbenzothiophene skeleton, or a substituted or unsubstituted naphthobenzofuranobenzothiophene skeleton.
- Ar 1 represents a substituted or unsubstituted aromatic hydrocarbon group having 6 to 25 carbon atoms
- Ar 2 represents a hydrocarbon group having 1 to 6 carbon atoms, or a substituted or unsubstituted aromatic group having 6 to 25 carbon atoms. Represents any one of hydrocarbon groups.
- R 1 to R 8 are each independently hydrogen, a hydrocarbon group having 1 to 10 carbon atoms, a cyclic hydrocarbon group having 3 to 10 carbon atoms, or a substituted or unsubstituted aromatic hydrocarbon having 6 to 14 carbon atoms. Represents any one of the groups.
- ⁇ 1 to ⁇ 4 are each independently a substituted or unsubstituted divalent aromatic hydrocarbon group having 6 to 25 carbon atoms.
- L, m, n and p each independently represents an integer of 0 to 2, and q is 1 or 2.
- the organic compound represented by the general formula (G1-1) can be obtained by a cross-coupling reaction between the compound (a1) and the arylamine compound (a2) as shown in the following synthesis scheme.
- Examples of X 1 include halogen groups such as chlorine, bromine and iodine, and sulfonyl groups.
- D 1 represents hydrogen when l is 0 (that is, compound (a2) is a secondary amine), and when it is 1 or more (that is, compound (a2) is a tertiary amine), boronic acid, dialkoxyboronic acid, arylaluminum , Arylzirconium, arylzinc, or aryltin.
- This reaction can proceed under various conditions.
- a synthesis method using a metal catalyst in the presence of a base can be applied.
- l is 0, Ullman coupling or Hartwig-Buchwald reaction can be used.
- l is 1 or more, the Suzuki-Miyaura reaction can be used.
- the compound (a2) is reacted with the compound (a2) by q equivalent, but q is 2 or more, that is, the substituent represented by the parenthesis of q with respect to B in the compound (G1) is 2
- the compound (a2) may be reacted with the compound (a1) one by one.
- the organic compound of one embodiment of the present invention can be synthesized.
- examples of the compound (a1) include compounds represented by the following general formulas (B1-a1) to (B4-a1). These are compounds useful for synthesizing the compound of one embodiment of the present invention. Similarly, the raw materials are useful as well. As for the synthesis method, it can be synthesized in the same manner as in the examples described later by appropriately changing the substitution position of the halogen.
- X 2 and X 3 each independently represent an oxygen atom or a sulfur atom.
- any one or two of R 10 to R 21 represent halogen, and the rest are each independently hydrogen, a hydrocarbon group having 1 to 10 carbon atoms, or 3 to 3 carbon atoms. It represents any one of 10 cyclic hydrocarbon groups and a substituted or unsubstituted aromatic hydrocarbon group having 6 to 14 carbon atoms.
- halogen is preferably any one or two of R 11 , R 12 , R 17, and R 18 among R 10 to R 21 because synthesis is simple.
- R 11 or R 12 and R 17 or R 18 halogen are preferable from the viewpoint of easy synthesis.
- R 11 and R 17 are preferably halogen
- R 12 and R 18 are preferably halogen.
- any one or two of R 30 to R 41 represent halogen, and the rest each independently represents hydrogen, a hydrocarbon group having 1 to 10 carbon atoms, or 3 to 3 carbon atoms. It represents any one of 10 cyclic hydrocarbon groups and a substituted or unsubstituted aromatic hydrocarbon group having 6 to 14 carbon atoms.
- halogen is preferably any one or two of R 31 , R 32 , R 37 and R 38 among R 30 to R 41 because synthesis is simple.
- R 31 or R 32 and R 37 or R 38 are a halogen.
- R 31 and R 37 are preferably halogen
- R 32 and R 38 are preferably halogen.
- any one or two of R 50 to R 61 represent a single bond, and the remaining are each independently hydrogen, a hydrocarbon group having 1 to 10 carbon atoms, or a carbon number of 3 Or a halogenated hydrocarbon group having 10 to 10 carbon atoms or a substituted or unsubstituted aromatic hydrocarbon group having 6 to 14 carbon atoms.
- the halogen is preferably any one or two of R 51 , R 52 , R 57 and R 58 among R 50 to R 61 .
- R 51 or R 52 and R 57 or R 58 are preferably halogen for ease of synthesis.
- R 51 and R 57 are preferably halogen
- R 52 and R 58 are preferably halogen.
- any one or two of R 70 to R 81 represent halogen, and the rest each independently represents hydrogen, a hydrocarbon group having 1 to 10 carbon atoms, or 3 to 3 carbon atoms. It represents any one of 10 cyclic hydrocarbon groups and a substituted or unsubstituted aromatic hydrocarbon group having 6 to 14 carbon atoms.
- the halogen is preferably any one or two of R 71 , R 72 , R 77 and R 78 among R 70 to R 81 .
- R 71 or R 72 and R 77 or R 78 are preferably halogen for ease of synthesis.
- R 71 and R 78 are preferably halogen
- R 72 and R 77 are preferably halogen.
- the light-emitting element in this embodiment includes a pair of electrodes including an anode 101 and a cathode 102, and an EL layer 103 provided between the anode 101 and the cathode 102.
- the EL layer 103 is configured by stacking several functional layers including at least the light emitting layer 113.
- Typical examples of the functional layer include a hole injection layer 111, a hole transport layer 112, a light emitting layer 113, an electron transport layer 114, an electron injection layer 115, and the like.
- An exciton blocking layer, a charge generation layer, and the like may be included.
- the anode 101 is preferably formed using a metal, an alloy, a conductive compound, a mixture thereof, or the like having a high work function (specifically, 4.0 eV or more).
- a metal an alloy, a conductive compound, a mixture thereof, or the like having a high work function (specifically, 4.0 eV or more).
- ITO Indium Tin Oxide
- IWZO indium oxide-tin oxide
- These conductive metal oxide films are usually formed by a sputtering method, but may be formed by applying a sol-gel method or the like.
- indium oxide-zinc oxide is formed by a sputtering method using a target in which 1 wt% or more and 20 wt% or less of zinc oxide is added to indium oxide.
- indium oxide (IWZO) containing tungsten oxide and zinc oxide uses a target containing 0.5 wt% to 5 wt% of tungsten oxide and 0.1 wt% to 1 wt% of zinc oxide with respect to indium oxide. It can also be formed by sputtering.
- Electrode materials other than the above can be selected regardless of the work function.
- the hole injection layer 111 may be formed using a first material having a relatively high acceptor property. Further, it is preferably formed using a composite material in which a first substance having acceptor properties and a second substance having hole transport properties are mixed. In the case where a composite material is used as the material for the hole injection layer 111, the first substance is a substance that has an acceptor property with respect to the second substance. When the first substance extracts electrons from the second substance, electrons are generated in the first substance, and holes are generated in the second substance from which the electrons have been extracted.
- the first substance is preferably a transition metal oxide, an oxide of a metal belonging to Groups 4 to 8 in the periodic table, an organic compound having an electron withdrawing group (halogen group or cyano group), or the like.
- transition metal oxides and oxides of metals belonging to Groups 4 to 8 of the periodic table include vanadium oxide, niobium oxide, tantalum oxide, chromium oxide, molybdenum oxide, and tungsten oxide.
- Manganese oxide, rhenium oxide, titanium oxide, ruthenium oxide, zirconium oxide, hafnium oxide and silver oxide are preferable because of their high acceptor properties.
- molybdenum oxide is especially preferable because it is stable in the air, has a low hygroscopic property, and is easy to handle.
- Examples of the organic compound having an electron withdrawing group include 7,7,8,8-tetracyano-2,3,5,6-tetrafluoroquinodimethane (abbreviation: F 4 -TCNQ), chloranil. 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazatriphenylene (approximately: HAT-CN), 1,3,4,5,7,8 -Hexafluorotetracyano-naphthoquinodimethane (abbreviation: F6-TCNNQ) etc. can be mentioned.
- a compound in which an electron withdrawing group is bonded to a condensed aromatic ring having a plurality of heteroatoms such as HAT-CN is preferable because it is thermally stable.
- the second substance is a substance having a hole transporting property, and preferably has a hole mobility of 10 ⁇ 6 cm 2 / Vs or higher.
- a material which can be used as the second substance N, N′-di (p-tolyl) -N, N′-diphenyl-p-phenylenediamine (abbreviation: DTDPPA), 4,4′-bis [N -(4-Diphenylaminophenyl) -N-phenylamino] biphenyl (abbreviation: DPAB), N, N′-bis ⁇ 4- [bis (3-methylphenyl) amino] phenyl ⁇ -N, N′-diphenyl- (1,1′-biphenyl) -4,4′-diamine (abbreviation: DNTPD), 1,3,5-tris [N- (4-diphenylaminophenyl) -N-phenylamino] benzene (abbreviation: DPA3
- the aromatic hydrocarbon may have a vinyl skeleton.
- the aromatic hydrocarbon having a vinyl group for example, 4,4′-bis (2,2-diphenylvinyl) biphenyl (abbreviation: DPVBi), 9,10-bis [4- (2,2- Diphenylvinyl) phenyl] anthracene (abbreviation: DPVPA) and the like.
- NPB N, N′-bis (3-methylphenyl) -N, N′-diphenyl- [ 1,1′-biphenyl] -4,4′-diamine
- TPD 1,1′-biphenyl] -4,4′-diamine
- BSPB 4,4′-bis [N- (spiro-9,9′-bifluoren-2-yl) -N-phenylamino] biphenyl
- BPAFLP 4-phenyl-4 ′-(9-phenylfluoren-9-yl) triphenylamine
- mBPAFLP 4-phenyl-3 ′-(9-phenylfluoren-9-yl) tri Phenylamine
- mBPAFLP 4-phenyl-4 ′-(9-phenyl-9H-carbazol-3-yl) tripheny
- the organic compound of one embodiment of the present invention is also a substance having a hole-transport property and can be used as the second substance.
- the hole injection layer 111 can also be formed by a wet method.
- PANI / PSS polyaniline / poly (styrene)
- a conductive polymer compound to which an acid such as sulfonic acid (PANI / PSS) is added can be used.
- the hole transport layer 112 is a layer containing a material having a hole transport property.
- the material having the hole-transport property the same material as the second substance mentioned as the substance constituting the hole-injecting layer 111 can be used.
- the hole transport layer 112 may be formed of a single layer or a plurality of layers. In the case of being formed of a plurality of layers, in order to facilitate the injection of holes, the HOMO level becomes deeper in a stepped manner from the layer on the hole injection layer 111 side to the layer on the light emitting layer 113 side. It is preferable that the configuration is long. Such a configuration is very suitable for a blue fluorescent light emitting element in which the host material in the light emitting layer 113 has a deep HOMO level.
- the hole transport layer 112 is formed of a plurality of layers whose HOMO levels are deepened stepwise toward the light-emitting layer 113.
- the hole injection layer 111 is formed using an organic acceptor (the above-described electron-withdrawing group (halogen)).
- an organic acceptor the above-described electron-withdrawing group (halogen)
- it is suitable for an element formed of an organic compound) having a group or a cyano group, and a very good element having a good carrier injection property and a low driving voltage can be obtained.
- the organic compound of one embodiment of the present invention is also a substance having a hole-transport property and can be used as a material having a hole-transport property.
- the hole-transport layer 112 can also be formed by a wet method.
- poly (N-vinylcarbazole) (abbreviation: PVK), poly (4-vinyltriphenylamine) (abbreviation: PVTPA), poly [N- (4- ⁇ N ′-[4- (4-diphenylamino) phenyl] phenyl-N′-phenylamino ⁇ phenyl) methacrylamide] (abbreviation: PTPDMA), poly [N, N′-bis (4-butylphenyl) -N, A high molecular compound such as N′-bis (phenyl) benzidine] (abbreviation: Poly-TPD) can be used.
- PVK poly (N-vinylcarbazole)
- PVTPA poly (4-vinyltriphenylamine)
- PTPDMA poly [N- (4- ⁇ N ′-[4- (4-diphenylamino) phenyl] phen
- the light-emitting layer 113 includes a layer containing a fluorescent material, a layer containing a phosphorescent material, a layer containing a material that emits thermally activated delayed fluorescence (TADF), a layer containing quantum dots, and a layer containing metal halogen perovskites.
- TADF thermally activated delayed fluorescence
- Any layer containing a light-emitting substance may be used, but the organic compound of one embodiment of the present invention described in Embodiment 1 is preferably included as a light-emitting substance.
- the light emitting layer 113 may be a single layer or a plurality of layers.
- a layer containing a phosphorescent material and a layer containing a fluorescent material may be stacked. At this time, it is preferable to use an exciplex described later in the layer containing the phosphorescent material.
- the organic compound of one embodiment of the present invention is also a substance having a favorable quantum yield and can be used as a light-emitting material.
- fluorescent light-emitting substance for example, the following substances can be used. In addition, fluorescent substances other than these can also be used. 5,6-bis [4- (10-phenyl-9-anthryl) phenyl] -2,2′-bipyridine (abbreviation: PAP2BPy), 5,6-bis [4 ′-(10-phenyl-9-anthryl) Biphenyl-4-yl] -2,2′-bipyridine (abbreviation: PAPP2BPy), (N, N′-diphenyl-N, N′-bis [4- (9-phenyl-9H-fluoren-9-yl) phenyl] ] Pyrene-1,6-diamine), N, N′-bis (3-methylphenyl) -N, N′-bis [3- (9-phenyl-9H-fluoren-9-yl) phenyl] pyrene-1 , 6-diamine (abbreviation: 1,6 mM emF
- Examples of materials that can be used as the phosphorescent material in the light-emitting layer 113 include the following. Tris ⁇ 2- [5- (2-methylphenyl) -4- (2,6-dimethylphenyl) -4H-1,2,4-triazol-3-yl- ⁇ N2] phenyl- ⁇ C ⁇ iridium (III) ( Abbreviations: [Ir (mpptz-dmp) 3 ]), tris (5-methyl-3,4-diphenyl-4H-1,2,4-triazolato) iridium (III) (abbreviation: [Ir (Mptz) 3 ]) 4H, such as Tris [4- (3-biphenyl) -5-isopropyl-3-phenyl-4H-1,2,4-triazolate] iridium (III) (abbreviation: [Ir (iPrptz-3b) 3 ]) An organometallic iridium complex having a triazole
- a rare earth metal complex such as tris (acetylacetonato) (monophenanthroline) terbium (III) (abbreviation: [Tb (acac) 3 (Phen)]) can be given. These are compounds which emit green phosphorescence mainly, and have a light emission peak at 500 nm to 600 nm. Note that an organometallic iridium complex having a pyrimidine skeleton is particularly preferable because of its outstanding reliability and luminous efficiency.
- various phosphorescent light emitting materials may be selected and used.
- TADF material fullerene and its derivatives, acridine and its derivatives, eosin derivatives and the like can be used.
- the metal-containing porphyrin include a protoporphyrin-tin fluoride complex (SnF 2 (Proto IX)), a mesoporphyrin-tin fluoride complex (SnF 2 (Meso IX)) represented by the following structural formula, and hematoporphyrin.
- the heterocyclic compound has a ⁇ -electron rich heteroaromatic ring and a ⁇ -electron deficient heteroaromatic ring, both the electron transport property and the hole transport property are high, which is preferable.
- a substance in which a ⁇ -electron rich heteroaromatic ring and a ⁇ -electron deficient heteroaromatic ring are directly bonded increases both the donor property of the ⁇ -electron rich heteroaromatic ring and the acceptor property of the ⁇ -electron deficient heteroaromatic ring. Since the energy difference between the S 1 level and the T 1 level is small, it is particularly preferable because thermally activated delayed fluorescence can be obtained efficiently.
- an aromatic ring to which an electron withdrawing group such as a cyano group is bonded may be used.
- CdZnSe A compound of indium, arsenic and phosphorus (InAsP), a compound of cadmium, selenium and sulfur (CdSeS), a compound of cadmium, selenium and tellurium (CdSeTe), a compound of indium, gallium and arsenic (InGaAs), indium, gallium and A compound of selenium (InGaSe), a compound of indium, selenium, and sulfur (InSeS), a compound of copper, indium, and sulfur (for example, CuInS 2 ), and combinations thereof can be exemplified, but not limited thereto.
- an alloy type quantum dot whose composition is represented by arbitrary ratios.
- an alloy type quantum dot represented by CdS x Se 1-x (x is an arbitrary number from 0 to 1) can change the emission wavelength by changing the ratio of x, and thus obtains blue light emission. Is one of the effective means.
- the structure of the quantum dot includes a core type, a core-shell type, and a core-multishell type, and any of them may be used, but the shell is covered with another inorganic material that covers the core and has a wider band gap.
- the shell material include zinc sulfide (ZnS) and zinc oxide (ZnO).
- Quantum dots also have high reactivity because of a high proportion of surface atoms, and aggregation is likely to occur. Therefore, it is preferable that a protective agent is attached or a protective group is provided on the surface of the quantum dots. Aggregation can be prevented and solubility in a solvent can be increased by attaching the protective agent or providing a protective group. It is also possible to reduce the reactivity and improve the electrical stability.
- Examples of the protecting agent include polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, tripropylphosphine, tributylphosphine, trihexylphosphine, Trialkylphosphines such as octylphosphine, polyoxyethylene alkylphenyl ethers such as polyoxyethylene n-octylphenyl ether, polyoxyethylene n-nonylphenyl ether, tri (n-hexyl) amine, tri (n-octyl) Tertiary amines such as amine and tri (n-decyl) amine, tripropylphosphine oxide, tributylphosphine oxide, trihexylphosphine oxide, trioctylphosphite Organic phosphorus compounds such as oxides and tridecylphosphine
- the quantum dots may be rod-like quantum rods. Since the quantum rod exhibits light having directivity polarized in the c-axis direction, a light-emitting element with better external quantum efficiency can be obtained by using the quantum rod as a light-emitting material.
- the quantum dots are dispersed in the host material, or the host material and the quantum dots are dissolved or dispersed in an appropriate liquid medium.
- spin coating method casting method, die coating method, blade coating method, roll coating method, ink jet method, printing method, spray coating method, curtain coating method, Langmuir / Blodgett method, etc.
- it may be formed by firing.
- liquid medium used in the wet process examples include ketones such as methyl ethyl ketone and cyclohexanone, fatty acid esters such as ethyl acetate, halogenated hydrocarbons such as dichlorobenzene, and aromatic carbonization such as toluene, xylene, mesitylene, and cyclohexyl benzene. Hydrogen, aliphatic hydrocarbons such as cyclohexane, decalin, and dodecane, and organic solvents such as dimethylformamide (DMF) and dimethyl sulfoxide (DMSO) can be used.
- ketones such as methyl ethyl ketone and cyclohexanone
- fatty acid esters such as ethyl acetate
- halogenated hydrocarbons such as dichlorobenzene
- aromatic carbonization such as toluene, xylene, mesitylene, and cyclohexyl benzene.
- CzPA cgDBCzPA, 2mBnfPPA, and PCzPA are preferable choices because they exhibit very good characteristics.
- various carrier transport materials such as a material having an electron transport property and a material having a hole transport property can be used.
- bis (10-hydroxybenzo [h] quinolinato) beryllium (II) (abbreviation: BeBq 2 ), bis (2-methyl-8-quinolinolato) (4-phenylphenolato) Aluminum (III) (abbreviation: BAlq), bis (8-quinolinolato) zinc (II) (abbreviation: Znq), bis [2- (2-benzoxazolyl) phenolato] zinc (II) (abbreviation: ZnPBO), Metal complexes such as bis [2- (2-benzothiazolyl) phenolato] zinc (II) (abbreviation: ZnBTZ), 2- (4-biphenylyl) -5- (4-tert-butylphenyl) -1,3,4 -Oxadiazole (abbreviation: PBD), 3- (4-biphenylyl) -4-phenyl-5- (4-tert-butylpheny
- a heterocyclic compound having a diazine skeleton and a heterocyclic compound having a pyridine skeleton are preferable because of their good reliability.
- a heterocyclic compound having a diazine (pyrimidine or pyrazine) skeleton has a high electron transporting property and contributes to a reduction in driving voltage.
- NPB 4,4′-bis [N- (1-naphthyl) -N-phenylamino] biphenyl
- TPD 4,4′-bis [N- (spiro-9,9′-bifluoren-2-yl) ) -N-phenylamino] biphenyl
- BSPB 4,4′-bis [N- (spiro-9,9′-bifluoren-2-yl) ) -N-phenylamino] biphenyl
- BSPB 4,4′-bis [N- (spiro-9,9′-bifluoren-2-yl) ) -N-phenylamino] biphenyl
- BPAFLP 4-phenyl-4 '-(9-phenylfluoren-9-yl) triphenylamine
- mBPAFLP 4-phenyl-4 ′-(9-phenyl-9H-carbamate
- CzPA cgDBCzPA, 2mBnfPPA, and PCzPA are preferable choices because they exhibit very good characteristics.
- the host material may be a material in which a plurality of types of substances are mixed.
- a mixed host material it is preferable to mix a material having an electron transporting property and a material having a hole transporting property. .
- energy transfer can be performed. Smooth and efficient light emission can be obtained.
- this structure is a preferable structure because the driving voltage can be reduced.
- the light emitting layer 113 having the above structure is manufactured by co-evaporation using a vacuum evaporation method, a gravure printing method, an offset printing method, an ink jet method, a spin coating method, a dip coating method, or the like using a mixed solution. Can do.
- the electron transport layer 114 is a layer containing a substance having an electron transport property.
- the substance having an electron transporting property the materials mentioned as the material having an electron transporting property that can be used for the host material or a material having an anthracene skeleton can be used.
- a layer for controlling the movement of electron carriers may be provided between the electron transport layer and the light emitting layer.
- This is a layer obtained by adding a small amount of a substance having a high electron trapping property to a material having a high electron transporting property as described above. By suppressing the movement of electron carriers, the carrier balance can be adjusted. Such a configuration is very effective in suppressing problems that occur when electrons penetrate through the light emitting layer (for example, a reduction in device lifetime).
- an electron injection layer 115 may be provided between the electron transport layer 114 and the cathode 102 in contact with the cathode 102.
- an alkali metal or an alkaline earth metal such as lithium fluoride (LiF), cesium fluoride (CsF), calcium fluoride (CaF 2 ), or a compound thereof can be used.
- a layer in which an alkali metal, an alkaline earth metal, or a compound thereof is contained in a layer formed of a substance having an electron transporting property can be used.
- electride may be used for the electron injection layer 115. Examples of the electride include a substance obtained by adding a high concentration of electrons to a mixed oxide of calcium and aluminum.
- a charge generation layer 116 may be provided instead of the electron injection layer 115 (FIG. 1B).
- the charge generation layer 116 is a layer that can inject holes into a layer in contact with the cathode side of the layer and inject electrons into a layer in contact with the anode side by applying a potential.
- the charge generation layer 116 includes at least a P-type layer 117.
- the P-type layer 117 is preferably formed using the composite material mentioned as the material that can form the hole injection layer 111 described above. Further, the P-type layer 117 may be formed by stacking the above-described film containing an acceptor material and a film containing a hole transport material as a material constituting the composite material.
- the P-type layer 117 By applying a potential to the P-type layer 117, electrons are injected into the electron transport layer 114 and holes are injected into the cathode 102, whereby the light emitting element operates. At this time, the presence of the layer containing the organic compound of one embodiment of the present invention at a position in contact with the charge generation layer 116 of the electron transport layer 114 suppresses a decrease in luminance due to accumulation of driving time of the light-emitting element, thereby reducing the lifetime. A long light emitting element can be obtained.
- the charge generation layer 116 is preferably provided with one or both of an electron relay layer 118 and an electron injection buffer layer 119 in addition to the P-type layer 117.
- the electron relay layer 118 includes at least a substance having an electron transporting property, and has a function of smoothly transferring electrons by preventing the interaction between the electron injection buffer layer 119 and the P-type layer 117.
- the LUMO level of the substance having an electron transporting property contained in the electron relay layer 118 is the LUMO level of the acceptor substance in the P-type layer 117 and the substance contained in the layer in contact with the charge generation layer 116 in the electron transporting layer 114. It is preferably between the LUMO levels.
- the specific energy level of the LUMO level in the substance having an electron transporting property used for the electron relay layer 118 is ⁇ 5.0 eV or more, preferably ⁇ 5.0 eV or more and ⁇ 3.0 eV or less. Note that as the substance having an electron transporting property used for the electron relay layer 118, a phthalocyanine-based material or a metal complex having a metal-oxygen bond and an aromatic ligand is preferably used.
- the electron injection buffer layer 119 includes an alkali metal, an alkaline earth metal, a rare earth metal, and a compound thereof (including an alkali metal compound (including an oxide such as lithium oxide, a halide, and a carbonate such as lithium carbonate and cesium carbonate).
- Alkaline earth metal compounds (including oxides, halides, carbonates) or rare earth metal compounds (including oxides, halides, carbonates) can be used. It is.
- the electron injection buffer layer 119 is formed to include an electron transporting substance and a donor substance, an alkali metal, an alkaline earth metal, a rare earth metal, or a compound thereof (as a donor substance)
- Alkali metal compounds including oxides such as lithium oxide, halides, carbonates such as lithium carbonate and cesium carbonate
- alkaline earth metal compounds including oxides, halides, carbonates
- rare earth metal compounds In addition to (including oxides, halides, and carbonates), organic compounds such as tetrathianaphthacene (abbreviation: TTN), nickelocene, and decamethyl nickelocene can also be used.
- TTN tetrathianaphthacene
- nickelocene nickelocene
- decamethyl nickelocene can also be used as the substance having an electron transporting property.
- a metal, an alloy, an electrically conductive compound, a mixture thereof, or the like having a low work function (specifically, 3.8 eV or less) can be used as a material for forming the cathode 102.
- a metal, an alloy, an electrically conductive compound, a mixture thereof, or the like having a low work function (specifically, 3.8 eV or less) can be used.
- cathode materials include alkali metals such as lithium (Li) and cesium (Cs), and group 1 of the periodic table of elements such as magnesium (Mg), calcium (Ca), and strontium (Sr) Examples include elements belonging to Group 2, and alloys containing these (MgAg, AlLi), europium (Eu), ytterbium (Yb), and other rare earth metals, and alloys containing these.
- a conductive material can be used as the cathode 102.
- These conductive materials can be formed by a dry method such as a vacuum evaporation method or a sputtering method, an inkjet method, a spin coating method, or the like.
- a sol-gel method may be used for a wet method, or a metal material paste may be used for a wet method.
- Various methods can be used for forming the EL layer 103 regardless of a dry method or a wet method.
- vacuum deposition method wet process method (spin coating method, casting method, die coating method, blade coating method, roll coating method, ink jet method, printing method (gravure printing method, offset printing method, screen printing method, etc.), spray coating Method, curtain coating method, Langmuir / Blodgett method, etc.).
- each electrode or each layer described above may be formed by using different film forming methods.
- FIGS. 2A to 2D are cross-sectional views illustrating a method for manufacturing the layer 786 including a light-emitting substance.
- the conductive film 772 is formed over the planarization insulating film 770, and the insulating film 730 is formed so as to cover part of the conductive film 772 (see FIG. 2A).
- a droplet 784 is discharged from a droplet discharge device 783 to an exposed portion of the conductive film 772 which is an opening of the insulating film 730, so that a layer 785 containing a composition is formed.
- the droplet 784 is a composition containing a solvent and adheres to the conductive film 772 (see FIG. 2B).
- step of discharging the droplet 784 may be performed under reduced pressure.
- the solvent is removed from the layer 785 containing the composition and solidified to form a layer 786 containing a light-emitting substance (see FIG. 2C).
- a drying step or a heating step may be performed.
- a conductive film 788 is formed over the layer 786 containing a light-emitting substance, so that a light-emitting element 782 is formed (see FIG. 2D).
- the layer 786 including a light-emitting substance is formed by a droplet discharge method, a composition can be selectively discharged, so that loss of materials can be reduced.
- a lithography process or the like for processing the shape is not necessary, the process can be simplified and cost reduction can be achieved.
- the droplet discharge method described above is a general term for a device having means for discharging droplets such as a nozzle having a composition discharge port or a head having one or a plurality of nozzles.
- FIG. 3 is a conceptual diagram illustrating the droplet discharge device 1400.
- the droplet discharge device 1400 includes a droplet discharge unit 1403.
- the droplet discharge unit 1403 includes a head 1405, a head 1412, and a head 1416.
- the head 1405, the head 1412, and the head 1416 are connected to the control means 1407, and can be drawn with a pre-programmed pattern by being controlled by the computer 1410.
- the drawing timing may be performed based on, for example, the marker 1411 formed on the substrate 1402.
- the reference point may be determined based on the outer edge of the substrate 1402.
- the marker 1411 is detected by the image pickup means 1404, the digital signal converted by the image processing means 1409 is recognized by the computer 1410, a control signal is generated and sent to the control means 1407.
- an image sensor using a charge coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) can be used as the imaging unit 1404.
- Information on the pattern to be formed on the substrate 1402 is stored in the storage medium 1408.
- a control signal is sent to the control means 1407, and the individual heads 1405 of the droplet discharge means 1403 are sent.
- the head 1412 and the head 1416 can be individually controlled.
- the material to be discharged is supplied from a material supply source 1413, a material supply source 1414, and a material supply source 1415 to a head 1405, a head 1412, and a head 1416 through piping.
- the inside of the head 1405 has a structure having a space filled with a liquid material as indicated by a dotted line 1406 and a nozzle that is a discharge port.
- the head 1412 and the head 1416 also have the same internal structure as the head 1405.
- the nozzles of the head 1405, the head 1412, and the head 1416 are provided with different sizes, different materials can be drawn simultaneously with different widths.
- a single head can discharge and draw multiple types of light emitting materials, and when drawing over a wide area, the same material can be simultaneously discharged and drawn from multiple nozzles to improve throughput. it can.
- the head 1405, the head 1412, and the head 1416 can freely scan the substrate in the directions of arrows X, Y, and Z shown in FIG. A plurality of the same patterns can be drawn on one substrate.
- the step of discharging the composition may be performed under reduced pressure.
- the substrate may be heated at the time of discharge.
- steps of drying and baking are performed.
- the drying and firing steps are both heat treatment steps, but their purpose, temperature and time are different.
- the drying process and the firing process are performed under normal pressure or reduced pressure by laser light irradiation, rapid thermal annealing, a heating furnace, or the like. Note that the timing of performing this heat treatment and the number of heat treatments are not particularly limited. In order to satisfactorily perform the drying and firing steps, the temperature at that time depends on the material of the substrate and the properties of the composition.
- the layer 786 containing a light-emitting substance can be manufactured using a droplet discharge apparatus.
- the layer 786 containing a light-emitting substance is formed using a droplet discharge device
- various kinds of organic materials and organic inorganic halogen perovskites are formed by a wet method using a composition in which a solvent is dissolved or dispersed in a solvent. It can be set as the composition for application
- organic solvent examples include benzene, toluene, xylene, mesitylene, tetrahydrofuran, dioxane, ethanol, methanol, n-propanol, isopropanol, n-butanol, t-butanol, acetonitrile, dimethyl sulfoxide, and dimethylformamide.
- organic solvents such as chloroform, methylene chloride, carbon tetrachloride, ethyl acetate, hexane, and cyclohexane can be used.
- the boiling point is preferably 100 ° C. or higher, and toluene, xylene, and mesitylene are more preferable.
- This light emitting element is a light emitting element having a plurality of light emitting units between an anode and a cathode.
- One light-emitting unit has a structure similar to that of the EL layer 103 illustrated in FIG. That is, the light-emitting element illustrated in FIG. 1A or 1B is a light-emitting element having one light-emitting unit, and the light-emitting element illustrated in FIG. 1C is a light-emitting element having a plurality of light-emitting units. It can be said that.
- an EL layer 503 including a first light-emitting unit 511 and a second light-emitting unit 512 is stacked between the first electrode 501 and the second electrode 502.
- a charge generation layer 513 is provided between the first light emitting unit 511 and the second light emitting unit 512.
- the first electrode 501 and the second electrode 502 correspond to the anode 101 and the cathode 102 in FIG. 1A, respectively, and the description of FIG. 1A can be applied.
- the first light emitting unit 511 and the second light emitting unit 512 may have the same configuration or different configurations.
- the charge generation layer 513 has a function of injecting electrons into one light-emitting unit and injecting holes into the other light-emitting unit when voltage is applied to the first electrode 501 and the second electrode 502. That is, in FIG. 1C, in the case where a voltage is applied so that the potential of the first electrode is higher than the potential of the second electrode, the charge generation layer 513 supplies electrons to the first light-emitting unit 511. As long as it injects holes into the second light emitting unit 512.
- the charge generation layer 513 is preferably formed with a structure similar to that of the charge generation layer 116 described with reference to FIG. Since the composite material of an organic compound and a metal oxide is excellent in carrier injecting property and carrier transporting property, low voltage driving and low current driving can be realized. Note that in the case where the anode side surface of the light emitting unit is in contact with the charge generation layer 513, the charge generation layer 513 can also serve as a hole injection layer of the light emission unit. Is not required.
- the electron injection buffer layer 119 is provided in the charge generation layer 513, since the layer serves as an electron injection buffer layer in the light emitting unit on the anode side, it is not always necessary to form the electron injection layer in the light emitting unit. .
- FIG. 1C illustrates a light-emitting element having two light-emitting units
- the present invention can be similarly applied to a light-emitting element in which three or more light-emitting units are stacked.
- a plurality of light-emitting units are partitioned and arranged between the pair of electrodes by the charge generation layer 513, thereby enabling high-luminance light emission while keeping the current density low.
- a long-life device can be realized.
- a light-emitting device that can be driven at a low voltage and has low power consumption can be realized.
- FIGS. 4A is a top view illustrating the light-emitting device
- FIG. 4B is a cross-sectional view taken along lines AB and CD of FIG. 4A.
- This light-emitting device includes a drive circuit portion (source line drive circuit) 601, a pixel portion 602, and a drive circuit portion (gate line drive circuit) 603 indicated by dotted lines, which control light emission of the light-emitting elements.
- Reference numeral 604 denotes a sealing substrate
- reference numeral 605 denotes a sealing material
- the inside surrounded by the sealing material 605 is a space 607.
- the lead wiring 608 is a wiring for transmitting a signal input to the source line driver circuit 601 and the gate line driver circuit 603, and a video signal, a clock signal, an FPC (flexible printed circuit) 609 serving as an external input terminal, Receives start signal, reset signal, etc.
- FPC flexible printed circuit
- a printed wiring board PWB
- the light-emitting device in this specification includes not only a light-emitting device body but also a state in which an FPC or a PWB is attached thereto.
- a driver circuit portion and a pixel portion are formed over the element substrate 610.
- a source line driver circuit 601 that is a driver circuit portion and one pixel in the pixel portion 602 are shown.
- the source line driver circuit 601 is a CMOS circuit in which an n-channel FET 623 and a p-channel FET 624 are combined.
- the drive circuit may be formed of various CMOS circuits, PMOS circuits, or NMOS circuits.
- CMOS circuits complementary metal-oxide-semiconductor
- PMOS circuits PMOS circuits
- NMOS circuits NMOS circuits.
- a driver integrated type in which a driver circuit is formed over a substrate is shown; however, this is not necessarily required, and the driver circuit can be formed outside the substrate.
- the pixel portion 602 is formed by a plurality of pixels including the switching FET 611, the current control FET 612, and the first electrode 613 electrically connected to the drain thereof, but is not limited thereto.
- the pixel portion may be a combination of two or more FETs and a capacitor.
- the type and crystallinity of the semiconductor used for the FET are not particularly limited, and an amorphous semiconductor or a crystalline semiconductor may be used.
- a semiconductor used for the FET a Group 13 semiconductor, a Group 14 semiconductor, a compound semiconductor, an oxide semiconductor, or an organic semiconductor can be used, but an oxide semiconductor is particularly preferable.
- the oxide semiconductor include In—Ga oxide and In—M—Zn oxide (M is Al, Ga, Y, Zr, La, Ce, or Nd). Note that the use of an oxide semiconductor material with an energy gap of 2 eV or more, preferably 2.5 eV or more, more preferably 3 eV or more can reduce the off-state current of the transistor, which is a preferable structure.
- an insulator 614 is formed so as to cover an end portion of the first electrode 613.
- a positive photosensitive acrylic resin film can be used.
- a curved surface having a curvature is formed at the upper end or the lower end of the insulator 614.
- a curvature radius 0.2 ⁇ m to 3 ⁇ m.
- the insulator 614 either a negative photosensitive resin or a positive photosensitive resin can be used.
- An EL layer 616 and a second electrode 617 are formed over the first electrode 613. These correspond to the anode 101, the EL layer 103, and the cathode 102 described in FIG. 1A, respectively, or the first electrode 501, the EL layer 503, and the second electrode 502 described in FIG.
- the EL layer 616 preferably contains an organometallic complex.
- the organometallic complex is preferably used as an emission center substance in the emission layer.
- the sealing substrate 604 is attached to the element substrate 610 with the sealant 605, whereby the light-emitting element 618 is provided in the space 607 surrounded by the element substrate 610, the sealing substrate 604, and the sealant 605. Yes.
- the space 607 is filled with a filler, and may be filled with a sealant 605 in addition to an inert gas (such as nitrogen or argon).
- an inert gas such as nitrogen or argon
- an epoxy resin or glass frit for the sealant 605. Moreover, it is desirable that these materials are materials that do not transmit moisture and oxygen as much as possible. Further, as a material used for the element substrate 610 and the sealing substrate 604, a plastic substrate made of FRP (Fiber Reinforced Plastics), PVF (polyvinyl fluoride), polyester, acrylic, or the like can be used in addition to a glass substrate or a quartz substrate.
- FRP Fiber Reinforced Plastics
- PVF polyvinyl fluoride
- polyester acrylic, or the like
- transistors and light-emitting elements can be formed using various substrates.
- substrate is not limited to a specific thing.
- the substrate include a semiconductor substrate (for example, a single crystal substrate or a silicon substrate), an SOI substrate, a glass substrate, a quartz substrate, a plastic substrate, a metal substrate, a stainless steel substrate, a substrate having stainless steel foil, and a tungsten substrate.
- the glass substrate include barium borosilicate glass, aluminoborosilicate glass, and soda lime glass.
- Examples of the flexible substrate, the laminated film, and the base film include the following.
- plastics represented by polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polyethersulfone (PES).
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- PES polyethersulfone
- Another example is a synthetic resin such as acrylic.
- examples include polytetrafluoroethylene (PTFE), polypropylene, polyester, polyvinyl fluoride, and polyvinyl chloride.
- PTFE polytetrafluoroethylene
- polypropylene polypropylene
- polyester polyvinyl fluoride
- polyvinyl chloride polyvinyl chloride
- polyamide polyimide
- aramid epoxy
- an inorganic vapor deposition film papers, and the like.
- a transistor with small variation in characteristics, size, or shape, high current capability, and small size can be manufactured.
- the power consumption of the circuit can be reduced or the circuit can be highly integrated.
- a flexible substrate may be used as a substrate, and a transistor or a light-emitting element may be formed directly over the flexible substrate.
- a separation layer may be provided between the substrate and the transistor or between the substrate and the light-emitting element. The separation layer can be used to separate a semiconductor device from another substrate and transfer it to another substrate after a semiconductor device is partially or entirely completed thereon. At that time, the transistor can be transferred to a substrate having poor heat resistance or a flexible substrate.
- a structure of a laminated structure of an inorganic film of a tungsten film and a silicon oxide film or a structure in which an organic resin film such as polyimide is formed over a substrate can be used for the above-described release layer.
- a transistor or a light-emitting element may be formed using a certain substrate, and then the transistor or the light-emitting element may be transferred to another substrate, and the transistor or the light-emitting element may be disposed on another substrate.
- substrates on which transistors and light-emitting elements are transferred include paper substrates, cellophane substrates, aramid film substrates, polyimide film substrates, stone substrates, wood substrates, and cloth substrates in addition to the above-described substrates on which transistors can be formed. (Natural fibers (silk, cotton, hemp), synthetic fibers (nylon, polyurethane, polyester) or recycled fibers (including acetate, cupra, rayon, recycled polyester), leather substrate, rubber substrate, etc.). By using these substrates, it is possible to form a transistor with good characteristics, a transistor with low power consumption, manufacture a device that is not easily broken, impart heat resistance, reduce weight, or reduce thickness.
- FIG. 5 shows an example of a light-emitting device in which a light-emitting element that emits white light is formed and a full color is obtained by providing a colored layer (color filter) or the like.
- FIG. 5A shows a substrate 1001, a base insulating film 1002, a gate insulating film 1003, gate electrodes 1006, 1007, and 1008, a first interlayer insulating film 1020, a second interlayer insulating film 1021, a peripheral portion 1042, and a pixel portion.
- a driver circuit portion 1041 light emitting element first electrodes 1024W, 1024R, 1024G, and 1024B, a partition wall 1025, an EL layer 1028, a light emitting element cathode 1029, a sealing substrate 1031, a sealant 1032, and the like are illustrated.
- colored layers are provided over a transparent base material 1033.
- a black layer (black matrix) 1035 may be further provided.
- the transparent base material 1033 provided with the coloring layer and the black layer is aligned and fixed to the substrate 1001.
- the colored layer and the black layer are covered with an overcoat layer.
- FIG. 5B illustrates an example in which a colored layer (a red colored layer 1034R, a green colored layer 1034G, or a blue colored layer 1034B) is formed between the gate insulating film 1003 and the first interlayer insulating film 1020.
- the coloring layer may be provided between the substrate 1001 and the sealing substrate 1031.
- a light-emitting device having a structure in which light is extracted to the substrate 1001 side where the FET is formed bottom emission type
- a structure in which light is extracted to the sealing substrate 1031 side top-emission type
- FIG. 1 A cross-sectional view of a top emission type light emitting device is shown in FIG.
- a substrate that does not transmit light can be used as the substrate 1001.
- the connection electrode for connecting the FET and the anode of the light emitting element is manufactured, it is formed in the same manner as the bottom emission type light emitting device.
- a third interlayer insulating film 1037 is formed so as to cover the electrode 1022. This insulating film may play a role of planarization.
- the third interlayer insulating film 1037 can be formed using various other materials in addition to the same material as the second interlayer insulating film.
- the first electrodes 1024W, 1024R, 1024G, and 1024B of the light-emitting element are anodes here, but may be cathodes. In the case of a top emission type light emitting device as shown in FIG. 6, the first electrode is preferably a reflective electrode.
- the EL layer 1028 has a structure as described for the EL layer 103 in FIG. 1A or the EL layer 503 in FIG. 1B and has an element structure in which white light emission can be obtained.
- sealing can be performed with a sealing substrate 1031 provided with colored layers (red colored layer 1034R, green colored layer 1034G, and blue colored layer 1034B).
- a black layer (black matrix) 1035 may be provided on the sealing substrate 1031 so as to be positioned between the pixels.
- the colored layer (red colored layer 1034R, green colored layer 1034G, blue colored layer 1034B) or black layer may be covered with an overcoat layer.
- the sealing substrate 1031 is a light-transmitting substrate.
- full-color display is performed with four colors of red, green, blue, and white
- full-color is displayed with three colors of red, green, and blue and four colors of red, green, blue, and yellow. Display may be performed.
- FIG. 7 illustrates a passive matrix light-emitting device which is one embodiment of the present invention.
- 7A is a perspective view illustrating the light-emitting device
- FIG. 7B is a cross-sectional view taken along line XY in FIG. 7A.
- an EL layer 955 is provided between the electrode 952 and the electrode 956 over the substrate 951.
- An end portion of the electrode 952 is covered with an insulating layer 953.
- a partition layer 954 is provided over the insulating layer 953.
- the side wall of the partition wall layer 954 has an inclination such that the distance between one side wall and the other side wall becomes narrower as it approaches the substrate surface.
- the cross section in the short side direction of the partition wall layer 954 has a trapezoidal shape, and the bottom side (the side facing the insulating layer 953 in the same direction as the surface direction of the insulating layer 953) is the top side (the surface of the insulating layer 953).
- the direction is the same as the direction and is shorter than the side not in contact with the insulating layer 953. In this manner, by providing the partition layer 954, defects in the light-emitting element due to static electricity or the like can be prevented.
- the light-emitting device described above can control a large number of minute light-emitting elements arranged in a matrix with FETs formed in a pixel portion, it is suitable as a display device that expresses an image. It is a light emitting device that can be used.
- FIG. 8B is a top view of the lighting device
- FIG. 8A is a cross-sectional view taken along line ef in FIG. 8B.
- a first electrode 401 is formed over a light-transmitting substrate 400 which is a support.
- the first electrode 401 corresponds to the anode 101 in FIGS.
- the first electrode 401 is formed using a light-transmitting material.
- a pad 412 for supplying a voltage to the second electrode 404 is formed on the substrate 400.
- An EL layer 403 is formed over the first electrode 401.
- the EL layer 403 corresponds to the EL layer 103 or the EL layer 503 in FIGS. For these configurations, refer to the description.
- a second electrode 404 is formed so as to cover the EL layer 403.
- the second electrode 404 corresponds to the cathode 102 in FIG.
- the second electrode 404 is formed including a material having high reflectivity.
- a voltage is supplied to the second electrode 404 by being connected to the pad 412.
- the first electrode 401, the EL layer 403, and the second electrode 404 form a light-emitting element.
- the lighting device is completed by fixing the light-emitting element to the sealing substrate 407 using the sealing materials 405 and 406 and sealing the light-emitting element. If the sealing material is formed in a double layer, a desiccant can be mixed in the inner sealing material, so that moisture can be adsorbed, leading to improvement in reliability.
- an external input terminal can be obtained.
- an IC chip 420 mounted with a converter or the like may be provided thereon.
- a television device also referred to as a television or a television receiver
- a monitor for a computer a digital camera, a digital video camera, a digital photo frame
- a mobile phone also referred to as a mobile phone or a mobile phone device
- large game machines such as portable game machines, portable information terminals, sound reproduction apparatuses, and pachinko machines. Specific examples of these electronic devices are shown below.
- FIG. 9A illustrates an example of a television device.
- a display portion 7103 is incorporated in a housing 7101.
- a structure in which the housing 7101 is supported by a stand 7105 is shown.
- An image can be displayed on the display portion 7103, and the display portion 7103 is formed by arranging light-emitting elements in a matrix.
- the television device can be operated with an operation switch included in the housing 7101 or a separate remote controller 7110.
- Channels and volume can be operated with an operation key 7109 provided in the remote controller 7110, and an image displayed on the display portion 7103 can be operated.
- the remote controller 7110 may be provided with a display portion 7107 for displaying information output from the remote controller 7110.
- the television device is provided with a receiver, a modem, and the like.
- General TV broadcasts can be received by a receiver, and connected to a wired or wireless communication network via a modem, so that it can be unidirectional (sender to receiver) or bidirectional (sender and receiver). It is also possible to perform information communication between each other or between recipients).
- FIG. 9B1 illustrates a computer, which includes a main body 7201, a housing 7202, a display portion 7203, a keyboard 7204, an external connection port 7205, a pointing device 7206, and the like. Note that this computer is manufactured by using light-emitting elements arranged in a matrix in the display portion 7203.
- the computer shown in FIG. 9B1 may have a form as shown in FIG. 9B2.
- a computer in FIG. 9B2 is provided with a second display portion 7210 instead of the keyboard 7204 and the pointing device 7206.
- the second display portion 7210 is a touch panel type, and input can be performed by operating a display for input displayed on the second display portion 7210 with a finger or a dedicated pen.
- the second display portion 7210 can display not only an input display but also other images.
- the display portion 7203 may also be a touch panel.
- the portable information terminal includes a display portion 7402 incorporated in a housing 7401, operation buttons 7403, an external connection port 7404, a speaker 7405, a microphone 7406, and the like. Note that the portable information terminal includes a display portion 7402 manufactured by arranging light-emitting elements in a matrix.
- the portable information terminal illustrated in FIGS. 9C and 9D can have a structure in which information can be input by touching the display portion 7402 with a finger or the like. In this case, operations such as making a call or creating a mail can be performed by touching the display portion 7402 with a finger or the like.
- the first mode is a display mode mainly for displaying an image.
- the first is a display mode mainly for displaying images, and the second is an input mode mainly for inputting information such as characters.
- the third is a display + input mode in which the display mode and the input mode are mixed.
- the display portion 7402 may be set to a character input mode mainly for inputting characters, and an operation for inputting characters displayed on the screen may be performed. In this case, it is preferable to display a keyboard or number buttons on most of the screen of the display portion 7402.
- the orientation (portrait or horizontal) of the mobile phone is determined, and the screen display of the display portion 7402 is automatically displayed. Can be switched automatically.
- the screen mode is switched by touching the display portion 7402 or operating the operation button 7403 of the housing 7401. Further, switching can be performed depending on the type of image displayed on the display portion 7402. For example, if the image signal to be displayed on the display unit is video data, the mode is switched to the display mode, and if it is text data, the mode is switched to the input mode.
- the screen mode is switched from the input mode to the display mode. You may control.
- the display portion 7402 can function as an image sensor. For example, personal authentication can be performed by touching the display portion 7402 with a palm or a finger and capturing an image of a palm print, a fingerprint, or the like. In addition, if a backlight that emits near-infrared light or a sensing light source that emits near-infrared light is used for the display portion, finger veins, palm veins, and the like can be imaged.
- the light-emitting element of one embodiment of the present invention is preferably used for the display portion.
- the light-emitting element can be a light-emitting element with favorable emission efficiency. Further, a light-emitting element with low driving voltage can be obtained. Therefore, an electronic device including the light-emitting element of one embodiment of the present invention can be an electronic device with low power consumption.
- FIG. 10 illustrates an example of a liquid crystal display device in which a light-emitting element is used for a backlight.
- the liquid crystal display device illustrated in FIG. 10 includes a housing 901, a liquid crystal layer 902, a backlight unit 903, and a housing 904, and the liquid crystal layer 902 is connected to a driver IC 905.
- a light emitting element is used for the backlight unit 903, and current is supplied from a terminal 906.
- the light-emitting element of one embodiment of the present invention is preferably used as the light-emitting element, and by using the light-emitting element for a backlight of a liquid crystal display device, a backlight with reduced power consumption can be obtained.
- FIG. 11 illustrates an example of a table lamp which is one embodiment of the present invention.
- the desk lamp illustrated in FIG. 11 includes a housing 2001 and a light source 2002, and a lighting device using a light-emitting element as the light source 2002 is used.
- FIG. 12 illustrates an example of an indoor lighting device 3001.
- the light-emitting element of one embodiment of the present invention is preferably used for the lighting device 3001.
- FIG. 13 illustrates an automobile which is one embodiment of the present invention.
- the automobile has a light emitting element mounted on a windshield or a dashboard.
- Display regions 5000 to 5005 are display regions provided using light-emitting elements.
- the light-emitting element of one embodiment of the present invention is preferably used, and thus the display region 5000 to the display region 5005 can be used in a vehicle because power consumption can be suppressed.
- a display area 5000 and a display area 5001 are display devices using light emitting elements provided on a windshield of an automobile.
- a so-called see-through display device in which the opposite side can be seen can be obtained. If it is a see-through display, it can be installed without obstructing the field of view even if it is installed on the windshield of an automobile.
- a light-transmitting transistor such as an organic transistor using an organic semiconductor material or a transistor using an oxide semiconductor is preferably used.
- a display region 5002 is a display device using a light emitting element provided in a pillar portion.
- the display area 5002 can complement the field of view blocked by the pillar by projecting an image from an imaging unit provided on the vehicle body.
- the display area 5003 provided in the dashboard portion compensates for the blind spot by projecting an image from the imaging means provided outside the automobile from the field of view blocked by the vehicle body, thereby improving safety. Can do. By displaying the video so as to complement the invisible part, it is possible to check the safety more naturally and without a sense of incongruity.
- the display area 5004 and the display area 5005 can provide various other information such as navigation information, a speedometer, a rotation speed, a travel distance, an oil supply amount, a gear state, and an air conditioning setting.
- the display items and layout can be appropriately changed according to the user's preference. Note that these pieces of information can also be displayed in the display area 5000 to the display area 5003.
- the display region 5000 to the display region 5005 can be used as a lighting device.
- FIG. 14A and FIG. 14B illustrate an example of a tablet terminal that can be folded.
- FIG. 14A shows an open state in which the tablet terminal includes a housing 9630, a display portion 9631a, a display portion 9631b, a display mode switching switch 9034, a power switch 9035, a power saving mode switching switch 9036, and a fastener 9033.
- the tablet terminal is manufactured using the light-emitting device including the light-emitting element of one embodiment of the present invention for one or both of the display portion 9631a and the display portion 9631b.
- Part of the display portion 9631 a can be a touch panel region 9632 a and data can be input when a displayed operation key 9637 is touched.
- a structure in which half of the regions have a display-only function and a structure in which the other half has a touch panel function is shown, but the structure is not limited thereto.
- the entire region of the display portion 9631a may have a touch panel function.
- the entire surface of the display portion 9631a can display keyboard buttons to serve as a touch panel, and the display portion 9631b can be used as a display screen.
- part of the display portion 9631b can be a touch panel region 9632b.
- a keyboard button can be displayed on the display portion 9631b by touching a position where the keyboard display switching button 9639 on the touch panel is displayed with a finger, a stylus, or the like.
- touch input can be performed on the touch panel region 9632a and the touch panel region 9632b at the same time.
- a display mode switching switch 9034 can select a display direction such as a vertical display or a horizontal display, a monochrome display or a color display.
- the power saving mode change-over switch 9036 can optimize the display luminance in accordance with the amount of external light during use detected by an optical sensor built in the tablet terminal.
- the tablet terminal may include not only an optical sensor but also other detection devices such as a gyroscope, an acceleration sensor, and other sensors that detect inclination.
- FIG. 14A shows an example in which the display areas of the display portion 9631b and the display portion 9631a are the same, but there is no particular limitation.
- One size and the other size may be different, and the display quality is also high. May be different.
- one display panel may be capable of displaying images with higher definition than the other.
- FIG. 14B illustrates a closed state in which the tablet terminal in this embodiment includes a housing 9630, a solar cell 9633, a charge / discharge control circuit 9634, a battery 9635, and a DCDC converter 9636. Note that FIG. 14B illustrates a structure including a battery 9635 and a DCDC converter 9636 as an example of the charge / discharge control circuit 9634.
- the tablet terminal can be folded in two, the housing 9630 can be closed when not in use. Therefore, since the display portion 9631a and the display portion 9631b can be protected, a tablet terminal that is excellent in durability and excellent in reliability from the viewpoint of long-term use can be provided.
- the tablet terminal shown in FIGS. 14A and 14B has a function for displaying various information (still images, moving images, text images, etc.), a calendar, a date, or a time.
- a function for displaying on the display unit, a touch input function for performing touch input operation or editing of information displayed on the display unit, a function for controlling processing by various software (programs), and the like can be provided.
- Electric power can be supplied to the touch panel, the display unit, the video signal processing unit, or the like by the solar battery 9633 mounted on the surface of the tablet terminal. Note that it is preferable that the solar battery 9633 be provided on one or two surfaces of the housing 9630 because the battery 9635 can be efficiently charged.
- FIG. 14C illustrates the solar battery 9633, the battery 9635, the DCDC converter 9636, the converter 9638, the switches SW1 to SW3, and the display portion 9631.
- the battery 9635, the DCDC converter 9636, the converter 9638, and the switches SW1 to SW3 are illustrated. This corresponds to the charge / discharge control circuit 9634 shown in FIG.
- the power generated by the solar battery is boosted or lowered by the DCDC converter 9636 so as to be a voltage for charging the battery 9635.
- the switch SW1 is turned on, and the converter 9638 increases or decreases the voltage required for the display portion 9631.
- the battery 9635 may be charged by turning off SW1 and turning on SW2.
- the solar cell 9633 is shown as an example of the power generation unit, the power generation unit is not particularly limited, and the battery 9635 is charged by another power generation unit such as a piezoelectric element (piezo element) or a thermoelectric conversion element (Peltier element). The structure which performs this may be sufficient.
- a non-contact power transmission module that wirelessly (contactlessly) transmits and receives power for charging and a combination of other charging means may be used, and the power generation means may not be provided.
- the tablet terminal is not limited to the shape illustrated in FIG.
- FIG. 15A to 15C show a foldable portable information terminal 9310.
- FIG. 15A illustrates the portable information terminal 9310 in a developed state.
- FIG. 15B illustrates the portable information terminal 9310 in a state in which the state is changing from one of the developed state or the folded state to the other.
- FIG. 15C illustrates the portable information terminal 9310 in a folded state.
- the portable information terminal 9310 is excellent in portability in the folded state and excellent in display listability due to a seamless wide display area in the expanded state.
- the display panel 9311 is supported by three housings 9315 connected by hinges 9313.
- the display panel 9311 may be a touch panel (input / output device) equipped with a touch sensor (input device).
- the display panel 9311 can be reversibly deformed from a developed state to a folded state by bending the two housings 9315 via the hinge 9313.
- the light-emitting device of one embodiment of the present invention can be used for the display panel 9311.
- a display region 9312 in the display panel 9311 is a display region located on a side surface of the portable information terminal 9310 in a folded state. In the display area 9312, information icons, frequently used applications, program shortcuts, and the like can be displayed, so that information can be confirmed and applications can be activated smoothly.
- the organic compound of one embodiment of the present invention can be used for an electronic device such as an organic thin film solar cell. More specifically, since it has carrier transportability, it can be used for a carrier transport layer and a carrier injection layer. Further, by using a mixed film with an acceptor substance, it can be used as a charge generation layer. Further, since it is optically excited, it can be used as a power generation layer.
- Step 1 Synthesis of 3,7-bis (4-chloro-2-fluorophenyl) -2,6-dimethoxynaphthalene>
- 11 g (24 mmol) 3,7-diiodo-2,6-dimethoxynaphthalene, 14 g (78 mmol) 4-chloro-2-fluorophenylboronic acid, 22 g (0.16 mol) potassium carbonate, 0.74 g (2.4 mmol) of tris (2-methylphenyl) phosphine was added.
- 120 mL of toluene was added.
- the mixture was degassed by stirring it under reduced pressure.
- 0.11 g (0.49 mmol) of palladium (II) acetate was added, and the mixture was stirred at 110 ° C. for 50.5 hours under a nitrogen stream.
- the synthesis scheme of Step 1 is shown below.
- Step 2 Synthesis of 3,7-bis (4-chloro-2-fluorophenyl) -2,6-dihydroxynaphthalene> 5.7 g (13 mmol) of 3,7-bis (4-chloro-2-fluorophenyl) -2,6-dimethoxynaphthalene was placed in a 200 mL three-necked flask, and the atmosphere in the flask was replaced with nitrogen. 32 mL of dichloromethane was added to the flask. To this solution, 28 mL (28 mmol) of boron tribromide (about 1.0 mol / L dichloromethane solution) and 20 mL of dichloromethane were added dropwise. After completion of dropping, the solution was stirred at room temperature.
- FIG. 17 shows 1 H NMR data of the obtained solid, and numerical data are shown below.
- Step 3 Synthesis of 3,10-dichloronaphtho [2,3-b; 6,7-b ′] bisbenzofuran>
- a 200 mL three-necked flask 5.4 g (13 mmol) of 3,7-bis (4-chloro-2-fluorophenyl) -2,6-dihydroxynaphthalene and 7.1 g (52 mmol) of potassium carbonate were placed.
- 130 mL of N-methyl-2-pyrrolidone was added, and the mixture was degassed by stirring it under reduced pressure. After degassing, the mixture was stirred at 120 ° C. for 7 hours under a nitrogen stream.
- Step 3 The synthesis scheme of Step 3 is shown below.
- Step 4 Sublimation purification of 1.1 g of the obtained solid was performed by a train sublimation method. The sample was heated at 390 ° C. under conditions of a pressure of 1.1 ⁇ 10 ⁇ 2 Pa and an argon flow rate of 0 mL / min. After purification by sublimation, 0.52 g of a yellow solid was obtained with a recovery rate of 42%.
- the synthesis scheme of Step 4 is shown below.
- FIG. 1 The absorption spectrum and emission spectrum of the thin film are shown in FIG.
- the solid thin film was produced on a quartz substrate by a vacuum deposition method.
- the absorption spectrum of the toluene solution was measured using an ultraviolet-visible spectrophotometer (model V550 manufactured by JASCO Corporation), and the spectrum measured by placing only toluene in a quartz cell was subtracted. Further, a spectrophotometer (Spectrophotometer U4100 manufactured by Hitachi High-Technologies Corporation) was used for measuring the absorption spectrum of the thin film.
- a fluorometer (FS920 manufactured by Hamamatsu Photonics Co., Ltd.) was used for measurement of the emission spectrum of the thin film.
- An absolute PL quantum yield measuring device (Quantaurus-QY manufactured by Hamamatsu Photonics) was used for measurement of the emission spectrum of the solution and measurement of the quantum yield.
- the 3,10 mM emFLPA2Nbf (IV) thin film has absorption peaks at around 428 nm, around 406 nm, around 307 nm, around 275 nm, and around 262 nm, and the emission wavelength peaks are around 454 nm and 482 nm (excitation wavelength: 410 nm). ) From this result, it was confirmed that 3,10 mM emFLPA2Nbf (IV) emits blue light, and it was found that it can be used as a host of a luminescent substance or a fluorescent substance in the visible region.
- EmFLPA2Nbf (IV) obtained in this example was analyzed by liquid chromatography mass spectrometry (Liquid Chromatography Mass Spectrometry, abbreviated as LC / MS analysis).
- the column temperature is set to 40 ° C. using an arbitrary column, the solvent is appropriately selected as the liquid feeding condition, and the sample is prepared by dissolving an arbitrary concentration of 3,10 mM emFLPA2Nbf (IV) in an organic solvent and injecting it. The amount was 5.0 ⁇ L.
- MS2 measurement of m / z 1150.45, which is an ion derived from 3,10 mM emFLPA2Nbf (IV), was performed by the Targeted-MS2 method.
- the energy NCE (Normalized Collision Energy) for accelerating the target ions in the collision cell was measured as 50.
- the obtained MS spectrum is shown in FIG.
- a light-emitting element 1 which is a light-emitting element of one embodiment of the present invention described in Embodiment Mode and a comparative light-emitting element 1 which is a light-emitting element of a comparative example will be described in detail.
- Structural formulas of organic compounds used in the light-emitting element 1 and the comparative light-emitting element 1 are shown below.
- indium tin oxide containing silicon oxide (ITSO) was formed over a glass substrate by a sputtering method, whereby the anode 101 was formed.
- the film thickness was 70 nm
- the electrode area was 4 mm 2 (2 mm ⁇ 2 mm).
- the surface of the substrate was washed with water, baked at 200 ° C. for 1 hour, and then subjected to UV ozone treatment for 370 seconds.
- the substrate is introduced into a vacuum vapor deposition apparatus whose internal pressure is reduced to about 10 ⁇ 4 Pa, vacuum baking is performed at 170 ° C. for 30 minutes in a heating chamber in the vacuum vapor deposition apparatus, and then the substrate is released for about 30 minutes. Chilled.
- the substrate on which the anode 101 is formed is fixed to a substrate holder provided in the vacuum deposition apparatus so that the surface on which the anode 101 is formed is downward, and vapor deposition using resistance heating is performed on the anode 101.
- PCPPn -9-phenyl-9H-carbazole
- VI molybdenum oxide
- cgDBCzPA was deposited on the light emitting layer 113 so as to have a film thickness of 15 nm, and 2,9-bis (naphthalen-2-yl) -4,7-diphenyl-1 represented by the above structural formula (iv) was obtained.
- 10-phenanthroline (abbreviation: NBPhen) was deposited to a thickness of 10 nm to form the electron transport layer 114.
- lithium fluoride (LiF) is deposited to a thickness of 1 nm to form an electron injection layer 115, and then aluminum is deposited to a thickness of 200 nm to form a cathode. 102 was formed to manufacture the light-emitting element 1.
- 3,10DPhA2Nbf (IV) used in Comparative Light-Emitting Element 1 and 3,10mMemFLPA2Nbf (IV) used in Light-Emitting Element 1 have the same structure of naphthobisbenzofuran as the main skeleton, but the structure of the amine to be bonded is It is a different substance.
- the luminance-current density characteristics of the light-emitting element 1 and the comparative light-emitting element 1 are shown in FIG. 23, the current efficiency-luminance characteristics in FIG. 24, the brightness-voltage characteristics in FIG. 25, and the current-voltage characteristics in FIG.
- the luminance characteristics are shown in FIG. 27, and the emission spectrum is shown in FIG.
- Table 2 summarizes element characteristics in the vicinity of luminance of 1000 cd / m 2 .
- the light-emitting element 1 showed a very good result with an external quantum efficiency of 10.7% at 1000 cd / m 2 .
- the light-emitting element 1 was a light-emitting element having better efficiency than the comparative light-emitting element 1.
- the chromaticity of the comparative light-emitting element 1 was smaller than that of the comparative light-emitting element 1, and the spectrum was narrowed. Thus, it was found that the luminescence was very good blue light emission. .
- FIG. 47 shows a graph showing a change in luminance with respect to driving time under the condition where the current value is 2 mA and the current density is constant. As shown in FIG. 47, it was found that the light-emitting element having the above structure is a light-emitting element with favorable lifetime.
- 3,10 mM emFLPA2Nbf (IV) which is one embodiment of the present invention is suitable as a blue light-emitting material with high emission efficiency, high color purity, and good reliability.
- a light-emitting element 2 which is a light-emitting element of one embodiment of the present invention described in Embodiment Mode will be described in detail. Structural formulas of organic compounds used in the light-emitting element 2 are shown below.
- indium tin oxide containing silicon oxide (ITSO) was formed over a glass substrate by a sputtering method, whereby the anode 101 was formed.
- the film thickness was 70 nm
- the electrode area was 4 mm 2 (2 mm ⁇ 2 mm).
- the surface of the substrate was washed with water, baked at 200 ° C. for 1 hour, and then subjected to UV ozone treatment for 370 seconds.
- the substrate is introduced into a vacuum vapor deposition apparatus whose internal pressure is reduced to about 10 ⁇ 4 Pa, vacuum baking is performed at 170 ° C. for 30 minutes in a heating chamber in the vacuum vapor deposition apparatus, and then the substrate is released for about 30 minutes. Chilled.
- the substrate on which the anode 101 is formed is fixed to a substrate holder provided in the vacuum deposition apparatus so that the surface on which the anode 101 is formed is downward, and vapor deposition using resistance heating is performed on the anode 101.
- PCPPn -9-phenyl-9H-carbazole
- VI molybdenum oxide
- 2- [3 ′-(dibenzothiophen-4-yl) biphenyl-3-yl] dibenzo [f, h] quinoxaline (abbreviation: 2mDBTBPDBq ⁇ ) represented by the above structural formula (viii) is formed over the light-emitting layer 113.
- II) is deposited to a thickness of 15 nm
- lithium fluoride (LiF) is deposited to a thickness of 1 nm to form an electron injection layer 115, and then aluminum is deposited to a thickness of 200 nm to form a cathode. 102 was formed to manufacture the light-emitting element 2 of this example.
- the element structure of the light-emitting element 2 is summarized in the following table.
- the luminance-current density characteristics of the light-emitting element 2 are shown in FIG. 29, the current efficiency-luminance characteristics in FIG. 30, the brightness-voltage characteristics in FIG. 31, the current-voltage characteristics in FIG. 32, and the xy chromaticity coordinate diagram in FIG. FIG. 34 shows the external quantum efficiency-luminance characteristics, and FIG. 35 shows the emission spectrum.
- Table 4 summarizes element characteristics around a luminance of 1000 cd / m 2 .
- the light-emitting element 2 was a light-emitting element exhibiting very good characteristics with an external quantum efficiency of 11.3% at 1000 cd / m 2 . It was also found that the light-emitting element 2 is an element that emits light with good efficiency. It was also found that the chromaticity was very good blue light emission.
- Step 1 Synthesis of 3,7-bis (4-chloro-2-fluorophenyl) -2,6-dimethoxynaphthalene> The compound was synthesized in the same manner as in Step 1 in Synthesis Example 1 of Example 1.
- Step 2 Synthesis of 3,7-bis (4-chloro-2-fluorophenyl) -2,6-dihydroxynaphthalene> Synthesis was performed in the same manner as in Step 2 in Synthesis Example 1 of Example 1.
- Step 3 Synthesis of 3,10-dichloronaphtho [2,3-b; 6,7-b ′] bisbenzofuran> Synthesis was performed in the same manner as in Step 3 in Synthesis Example 1 of Example 1.
- FIG. 36 shows the 1 H NMR data of the obtained solid, and the numerical data are shown below. Note that FIG. 36B is a graph in which the range of 6.5 ppm to 8.5 ppm in FIG. Thus, it was found that 3,10 mFLPA2Nbf (IV), which is an organic compound of one embodiment of the present invention, was obtained in this synthesis example.
- FIG. 37 shows the results of measuring the absorption spectrum and emission spectrum of a toluene solution of 3,10 mFLPA2Nbf (IV), and FIG. 38 shows the absorption spectrum and emission spectrum of the thin film.
- the solid thin film was produced on a quartz substrate by a vacuum deposition method.
- the absorption spectrum of the toluene solution was measured using an ultraviolet-visible spectrophotometer (V550, manufactured by JASCO Corporation), and the spectrum obtained by putting only toluene in a quartz cell and subtracting the measured spectrum was shown. Further, a spectrophotometer (Spectrophotometer U4100 manufactured by Hitachi High-Technologies Corporation) was used for measuring the absorption spectrum of the thin film.
- a fluorometer (FS920 manufactured by Hamamatsu Photonics Co., Ltd.) was used for measurement of the emission spectrum of the thin film.
- An absolute PL quantum yield measuring device (Quantaurus-QY, manufactured by Hamamatsu Photonics) was used to measure the emission spectrum and quantum yield of the toluene solution.
- the toluene solution of 3,10 mFLPA2Nbf (IV) showed absorption peaks at 424 nm, 401 nm, 308 nm, and 282 nm, and the emission wavelength peaks were 437 nm and 464 nm (excitation wavelength 410 nm).
- the 3,10 mFLPA2Nbf (IV) thin film showed absorption peaks at 427 nm, 406 nm, 308 nm, 278 nm and 260 nm, and the emission wavelength peak was found at 453 nm and 480 nm (excitation wavelength 400 nm). From this result, it was confirmed that 3,10mFLPA2Nbf (IV) emits blue light, and it was found that it can be used as a host of a luminescent substance or a fluorescent luminescent substance in the visible region.
- the quantum yield in the toluene solution was measured, it was as high as 96%, and it was found that it was suitable as a light emitting material.
- the column temperature is set to 40 ° C. using any column, the solvent is appropriately selected as the liquid feeding condition, and the sample is adjusted by dissolving 3,10 mFLPA2Nbf (IV) of an arbitrary concentration in an organic solvent and injected. The amount was 5.0 ⁇ L.
- MS 2 measurement of m / z 11122.42, which is an ion derived from 3,10 mFLPA2Nbf (IV), was performed by the Targeted-MS 2 method.
- the energy NCE (Normalized Collision Energy) for accelerating the target ions in the collision cell was measured as 50.
- the obtained MS spectrum is shown in FIG.
- the result shown in FIG. 39 shows the characteristic result derived from 3,10mFLPA2Nbf (IV)
- 10mFLPA2Nbf (IV) contains a 3- (9-phenyl-9H-fluoren-9-yl) diphenylamino group.
- a light-emitting element 3 which is a light-emitting element of one embodiment of the present invention described in Embodiment Mode will be described in detail. Structural formulas of organic compounds used in the light-emitting element 3 are shown below.
- indium tin oxide containing silicon oxide (ITSO) was formed over a glass substrate by a sputtering method, whereby the anode 101 was formed.
- the film thickness was 70 nm
- the electrode area was 4 mm 2 (2 mm ⁇ 2 mm).
- the surface of the substrate was washed with water, baked at 200 ° C. for 1 hour, and then subjected to UV ozone treatment for 370 seconds.
- the substrate is introduced into a vacuum vapor deposition apparatus whose internal pressure is reduced to about 10 ⁇ 4 Pa, vacuum baking is performed at 170 ° C. for 30 minutes in a heating chamber in the vacuum vapor deposition apparatus, and then the substrate is released for about 30 minutes. Chilled.
- the substrate on which the anode 101 is formed is fixed to a substrate holder provided in the vacuum deposition apparatus so that the surface on which the anode 101 is formed is downward, and vapor deposition using resistance heating is performed on the anode 101.
- PCPPn -9-phenyl-9H-carbazole
- VI molybdenum oxide
- cgDBCzPA was deposited on the light emitting layer 113 so as to have a film thickness of 15 nm, and 2,9-bis (naphthalen-2-yl) -4,7-diphenyl-1 represented by the above structural formula (iv) was obtained.
- 10-phenanthroline (abbreviation: NBPhen) was deposited to a thickness of 10 nm to form the electron transport layer 114.
- lithium fluoride (LiF) is deposited to a thickness of 1 nm to form an electron injection layer 115, and then aluminum is deposited to a thickness of 200 nm to form a cathode. 102 was formed to manufacture the light-emitting element 3.
- the element structure of the light-emitting element 3 is summarized in the following table.
- the luminance-current density characteristics of the light-emitting element 3 are shown in FIG. 40, the current efficiency-luminance characteristics in FIG. 41, the brightness-voltage characteristics in FIG. 42, the current-voltage characteristics in FIG. 43, and the external quantum efficiency-luminance characteristics. 44 shows the emission spectrum.
- Table 6 summarizes element characteristics around a luminance of 1000 cd / m 2 .
- the light-emitting element 3 showed very good results with an external quantum efficiency of 9.8% at 1000 cd / m 2 .
- the chromaticity was found to be very good blue light emission because the peak on the long wavelength side was small and the half width of the spectrum was narrow.
- FIG. 46 shows a graph showing a change in luminance with respect to driving time under the condition that the current value is 2 mA and the current density is constant. As shown in FIG. 46, it was found that the light-emitting element 3 maintained 85% or more of the initial luminance even after 100 hours had elapsed, and had a good lifetime.
- 3,10 mFLPA2Nbf (IV) which is one embodiment of the present invention is suitable as a blue light-emitting material with high emission efficiency, high color purity, and good reliability.
- Electron injection buffer layer 400: Substrate, 401: First electrode, 403: EL layer, 404: Second electrode, 405: Seal material, 406: Seal 407: sealing substrate, 412: pad, 420: IC chip, 501: first electrode, 502: second electrode, 503: EL layer, 511: first light emitting unit, 512: second light emitting Unit: 513: charge generation layer, 601: drive circuit portion (source line drive circuit), 602: pixel portion, 603: drive circuit portion (gate line drive circuit), 604: sealing substrate, 605: sealing material, 607: Space, 6 8: wiring, 609: FPC (flexible printed circuit), 610: element
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Abstract
Description
本発明の一態様の有機化合物は、下記一般式(G1)で表される有機化合物である。
本発明の一態様である発光素子の例について図1(A)を用いて以下、詳細に説明する。
本実施の形態では、実施の形態1に記載の発光素子を用いた発光装置について説明する。
本発明の一態様である照明装置を図8を参照しながら説明する。図8(B)は照明装置の上面図、図8(A)は図8(B)におけるe−f断面図である。
本発明の一態様である電子機器の例について説明する。電子機器として、例えば、テレビジョン装置(テレビ、またはテレビジョン受信機ともいう)、コンピュータ用などのモニタ、デジタルカメラ、デジタルビデオカメラ、デジタルフォトフレーム、携帯電話機(携帯電話、携帯電話装置ともいう)、携帯型ゲーム機、携帯情報端末、音響再生装置、パチンコ機などの大型ゲーム機などが挙げられる。これらの電子機器の具体例を以下に示す。
本合成例では、実施の形態1で構造式(102)として示したN,N’−ビス(3−メチルフェニル)−N,N’−ビス[3−(9−フェニル−9H−フルオレン−9−イル)フェニル]−ナフト[2,3−b;6,7−b’]ビスベンゾフラン−3,10−ジアミン(略称:3,10mMemFLPA2Nbf(IV))の合成方法について詳細に説明する。3,10mMemFLPA2Nbf(IV)の構造式を以下に示す。
500mL三口フラスコに11g(24mmol)の3,7−ジヨード−2,6−ジメトキシナフタレンと、14g(78mmol)の4−クロロ−2−フルオロフェニルボロン酸と、22g(0.16mol)の炭酸カリウムと、0.74g(2.4mmol)のトリス(2−メチルフェニル)ホスフィンを入れた。この混合物に、120mLのトルエンを加えた。この混合物を減圧しながら攪拌することで脱気した。この混合物に0.11g(0.49mmol)の酢酸パラジウム(II)を加え、窒素気流下、110℃で50.5時間攪拌した。
1H NMR(CDCl3,300MHz):δ=3.88(s,6H),7.18−7.24(m,6H),7.37(t,J1=7.2Hz,2H),7.65(s,2H).
200mL三口フラスコに5.7g(13mmol)の3,7−ビス(4−クロロ−2−フルオロフェニル)−2,6−ジメトキシナフタレンを入れ、フラスコ内を窒素置換した。このフラスコに32mLのジクロロメタンを加えた。この溶液に28mL(28mmol)の三臭化ホウ素(約1.0mol/Lジクロロメタン溶液)と20mLのジクロロメタンを滴下した。滴下終了後、この溶液を室温で攪拌した。
1H NMR(DMSO−d6,300MHz):δ=7.20(s,2H),7.37(dd,J1=8.4Hz,J2=1.8Hz,2H),7.46−7.52(m,4H),7.59(s,2H),9.71(s,2H).
200mLの三口フラスコに5.4g(13mmol)の3,7−ビス(4−クロロ−2−フルオロフェニル)−2,6−ジヒドロキシナフタレンと7.1g(52mmol)の炭酸カリウムを入れた。この混合物に、N−メチル−2−ピロリドン130mLを加え、この混合物を減圧しながら攪拌することで脱気した。脱気後、この混合物を、窒素気流下、120℃で7時間攪拌した。撹拌後、この混合物に水を加え、析出した固体を濾取した。この固体を水、エタノールで洗浄した。得られた固体にエタノールを加え、加熱撹拌後、濾過し固体を得た。得られた固体に酢酸エチルを加え、加熱撹拌後、濾過して淡黄色固体を4.5g、収率92%で得た。ステップ3の合成スキームを以下に示す。
1H NMR(1,1,2,2−Tetrachloroethane−D2,300MHz):δ=7.44(dd,J1=8.1Hz,J2=1.5Hz,2H),7.65(d,J1=1.8Hz,2H),8.05(d,J1=8.4Hz,2H),8.14(s,2H),8.52(s,2H).
200mL三口フラスコに0.82g(2.2mmol)の3,10−ジクロロナフト[2,3−b;6,7−b’]ビスベンゾフランと、2.8g(6.5mmol)のN−(3−メチルフェニル)−3−(9−フェニル−9H−フルオレン−9−イル)フェニルアミンと、78mg(0.22mmol)のジ(1−アダマンチル)−n−ブチルホスフィンと、1.3g(13mmol)のナトリウムtert−ブトキシドを入れた。この混合物に、25mLのキシレンを加えた。この混合物を減圧しながら攪拌することで脱気した。この混合物に25mg(43μmol)のビス(ジベンジリデンアセトン)パラジウム(0)を加え、窒素気流下、150℃で9.5時間攪拌した。
1H NMR(1,1,2,2−Tetrachloroethane−D2,300MHz):δ=2.30(s,6H),6.74(d,J1=7.8Hz,2H),6.90−7.00(m,8H),7.05−7.32(m,24H),7.36−7.41(m,8H),7.76−7.79(m,4H),7.85(d,J1=8.1Hz,2H),8.02(s,2H),8.37(s,2H).
まず、ガラス基板上に、酸化珪素を含むインジウム錫酸化物(ITSO)をスパッタリング法にて成膜し、陽極101を形成した。なお、その膜厚は70nmとし、電極面積は4mm2(2mm×2mm)とした。
比較発光素子1は、発光素子1における発光層113に用いた3,10mMemFLPA2Nbf(IV)を上記構造式(v)で表される3,10−ビス(ジフェニルアミノ)ナフト[2,3−b;6,7−b’]ビスベンゾフラン(略称:3,10DPhA2Nbf(IV))に変えて発光層113を形成し、また、電子輸送層114に用いたNBPhenを上記構造式(vi)で表されるバソフェナントロリン(略称:BPhen)に変えて電子輸送層114を形成することによって作製した。比較発光素子1で用いた3,10DPhA2Nbf(IV)と、発光素子1で用いた3,10mMemFLPA2Nbf(IV)は、主骨格であるナフトビスベンゾフランの構造は同一であるが、結合するアミンの構造が異なる物質である。
まず、ガラス基板上に、酸化珪素を含むインジウム錫酸化物(ITSO)をスパッタリング法にて成膜し、陽極101を形成した。なお、その膜厚は70nmとし、電極面積は4mm2(2mm×2mm)とした。
本合成例では、N,N’−ジフェニル−N,N’−ビス[3−(9−フェニル−9H−フルオレン−9−イル)フェニル]−ナフト[2,3−b;6,7−b’]ビスベンゾフラン−3,10−ジアミン(略称:3,10mFLPA2Nbf(IV))の合成方法について詳細に説明する。3,10mFLPA2Nbf(IV)の構造式を以下に示す。
実施例1の合成例1におけるステップ1と同様に合成した。
実施例1の合成例1におけるステップ2と同様に合成した。
実施例1の合成例1におけるステップ3と同様に合成した。
200mL三口フラスコに、0.84g(2.2mmol)の3,10−ジクロロナフト[2,3−b;6,7−b’]ビスベンゾフランと、2.7g(6.7mmol)の3−(9−フェニル−9H−フルオレン−9−イル)ジフェニルアミンと、80mg(0.22mmol)のジ(1−アダマンチル)−n−ブチルホスフィンと、1.3g(13mmol)のナトリウム tert−ブトキシドを入れた。この混合物に、25mLのキシレンを加えた。この混合物を減圧しながら攪拌することで脱気した。この混合物に26mg(45μmol)のビス(ジベンジリデンアセトン)パラジウム(0)を加え、窒素気流下、150℃で7時間攪拌した。
1H NMR(1,1,2,2−Tetrachloroethane−D2,300MHz):δ=6.76(d,J1=8.1Hz,2H),6.98−7.33(m,32H),7.36−7.40(m,8H),7.76−7.79(m,4H),7.85(d,J1=8.4Hz,2H),8.02(s,2H),8.38(s,2H).
まず、ガラス基板上に、酸化珪素を含むインジウム錫酸化物(ITSO)をスパッタリング法にて成膜し、陽極101を形成した。なお、その膜厚は70nmとし、電極面積は4mm2(2mm×2mm)とした。
Claims (20)
- 下記一般式(G1)で表される有機化合物。
- 請求項1において、前記Ar2が炭素数6乃至12の芳香族炭化水素基である有機化合物。
- 請求項1または請求項2において、前記pが0である有機化合物。
- 請求項1または請求項2において、前記pが1であり、前記α4がフェニレン基である有機化合物。
- 請求項1または請求項2において、前記l、前記mおよび前記nがそれぞれ独立に0または1であり、前記α1乃至α3がフェニレン基である有機化合物。
- 請求項1または請求項2において、前記lが0である有機化合物。
- 請求項7において、前記一般式(B1)におけるR11、R12、R17およびR18のいずれか1または2が前記一般式(g1)で表される基を表す有機化合物。
- 請求項9において、前記一般式(B2)におけるR31、R32、R37およびR38のいずれか1または2が前記一般式(g1)で表される基を表す有機化合物。
- 請求項11において、前記一般式(B3)におけるR51、R52、R57およびR58のいずれか1または2が前記一般式(g1)で表される基を表す有機化合物。
- 請求項7、請求項9および請求項11のいずれか一項において、前記X2およびX3が酸素原子である有機化合物。
- 請求項1、請求項7、請求項9および請求項11のいずれか一項において、分子量が1300以下である有機化合物。
- 請求項1、請求項7、請求項9および請求項11のいずれか一項において、分子量が1200以下である有機化合物。
- 請求項1、請求項7、請求項9および請求項11のいずれか一項に記載の有機化合物を含む発光素子。
- 請求項16に記載の発光素子と、トランジスタ、または、基板と、を有する発光装置。
- 請求項17に記載の発光装置と、センサ、操作ボタン、スピーカ、または、マイクと、を有する電子機器。
- 請求項17に記載の発光装置と、筐体と、を有する照明装置。
- 請求項1、請求項7、請求項9および請求項11のいずれか一項に記載の有機化合物を含む電子デバイス。
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