WO2010052932A1 - トリフェニルシリル基とトリアリールアミン構造を有する化合物および有機エレクトロルミネッセンス素子 - Google Patents
トリフェニルシリル基とトリアリールアミン構造を有する化合物および有機エレクトロルミネッセンス素子 Download PDFInfo
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- WO2010052932A1 WO2010052932A1 PCT/JP2009/005953 JP2009005953W WO2010052932A1 WO 2010052932 A1 WO2010052932 A1 WO 2010052932A1 JP 2009005953 W JP2009005953 W JP 2009005953W WO 2010052932 A1 WO2010052932 A1 WO 2010052932A1
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- 125000001153 fluoro group Chemical group F* 0.000 claims description 21
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- 239000002184 metal Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- IBHBKWKFFTZAHE-UHFFFAOYSA-N n-[4-[4-(n-naphthalen-1-ylanilino)phenyl]phenyl]-n-phenylnaphthalen-1-amine Chemical compound C1=CC=CC=C1N(C=1C2=CC=CC=C2C=CC=1)C1=CC=C(C=2C=CC(=CC=2)N(C=2C=CC=CC=2)C=2C3=CC=CC=C3C=CC=2)C=C1 IBHBKWKFFTZAHE-UHFFFAOYSA-N 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 1
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- NTNWKDHZTDQSST-UHFFFAOYSA-N naphthalene-1,2-diamine Chemical class C1=CC=CC2=C(N)C(N)=CC=C21 NTNWKDHZTDQSST-UHFFFAOYSA-N 0.000 description 1
- 125000004593 naphthyridinyl group Chemical group N1=C(C=CC2=CC=CN=C12)* 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 150000004866 oxadiazoles Chemical class 0.000 description 1
- 150000007978 oxazole derivatives Chemical class 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 125000004625 phenanthrolinyl group Chemical group N1=C(C=CC2=CC=C3C=CC=NC3=C12)* 0.000 description 1
- 238000005424 photoluminescence Methods 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 125000003226 pyrazolyl group Chemical group 0.000 description 1
- 125000004076 pyridyl group Chemical group 0.000 description 1
- 125000000714 pyrimidinyl group Chemical group 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 125000005493 quinolyl group Chemical group 0.000 description 1
- 125000001567 quinoxalinyl group Chemical group N1=C(C=NC2=CC=CC=C12)* 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- YYMBJDOZVAITBP-UHFFFAOYSA-N rubrene Chemical class C1=CC=CC=C1C(C1=C(C=2C=CC=CC=2)C2=CC=CC=C2C(C=2C=CC=CC=2)=C11)=C(C=CC=C2)C2=C1C1=CC=CC=C1 YYMBJDOZVAITBP-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 125000003808 silyl group Chemical group [H][Si]([H])([H])[*] 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 229940042055 systemic antimycotics triazole derivative Drugs 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000001973 tert-pentyl group Chemical group [H]C([H])([H])C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000001544 thienyl group Chemical group 0.000 description 1
- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 description 1
- 150000003852 triazoles Chemical class 0.000 description 1
- 125000006617 triphenylamine group Chemical group 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
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Definitions
- the present invention relates to a compound and an element suitable for an organic electroluminescence element which is a self-luminous element suitable for various display devices, and more specifically, a compound having a triphenylsilyl group and a triarylamine structure, and the compound.
- the present invention relates to an organic electroluminescence element used.
- the organic electroluminescence element is a self-luminous element, it has been actively researched because it is brighter and more visible than a liquid crystal element and has a clear display.
- the phosphorescent emitter Since the phosphorescent emitter causes concentration quenching, it is supported by doping the phosphorescent emitter with a charge transporting compound generally called a host compound.
- the supported phosphorescent emitter is called a guest compound.
- a host compound 4,4′-di (N-carbazolyl) biphenyl (hereinafter abbreviated as CBP) represented by the following formula has been generally used (for example, see Non-patent Document 1).
- TCTA N-carbazolyl triphenylamine
- TCTA which is a hole transporting host compound
- TPBI represented by the following formula which is an electron transporting host compound
- High-efficiency and low-voltage driving is achieved by using a TCTA as an electron blocking layer for confining triplet excitons, using a light-emitting layer doped with a mixed host compound mixed with Nb (for example, non-patent literature). 4).
- blue phosphorescent emitter FIrpic represented by the following formula
- the external quantum efficiency of the phosphorescent light emitting device doped with CBP as a light emitting layer host compound remains at 6%.
- the reason is that the triplet level of FIrpic is 2.62 eV, whereas the triplet level of CBP is as low as 2.56 eV, so that the trapping of triplet excitons by FIrpic is insufficient. it was thought.
- the excited triplet level of TCTA used as the electron blocking layer of the green phosphorescent light emitting device is 2.60 eV, which is still insufficient to confine the FIrpic triplet exciton.
- a host compound and an electron blocking compound for the light emitting layer that completely confine triplet excitons of the phosphorescent emitter are required.
- Non-Patent Document 1 Appl. Phys. Lett. , 75, 4 (1999)
- Non-Patent Document 2 The 9th Workshop of the Japan Society of Applied Physics Organic Molecular Bioelectronics, 17 (2001)
- Non-patent document 3 Ohm Co., Ltd., organic EL display, 90 (2005)
- Non-Patent Document 4 SID07 DIGEST 837 (2007)
- Non-patent document 5 Journal of the Japan Society of Applied Physics, Organic Molecular Bioelectronics Subcommittee, 14 (1), 23 (2003)
- the object of the present invention is to provide a host compound and an electron blocking layer for a light-emitting layer having a high excited triplet level and capable of completely confining triplet excitons of a phosphorescent emitter as a material for a highly efficient organic electroluminescent device. It is another object of the present invention to provide a high-efficiency, high-brightness organic electroluminescence device using this compound.
- the physical properties of the organic compound to be provided by the present invention include (1) high excitation triplet level, (2) bipolar transportability, and (3) stable thin film state. I can give you.
- the physical characteristics that the organic electroluminescence device to be provided by the present invention should have include (1) high luminous efficiency, (2) high emission luminance, and (3) low practical driving voltage. I can give you something.
- the present inventors have determined that the triphenylsilyl group has an electron transport ability and the triarylamine structure has a hole transport ability. Focusing on the novel tripletylsilyl group and triarylamine that have characteristics suitable for phosphorescent devices by designing and chemically synthesizing compounds using the excited triplet level as an index and actually measuring the excited triplet level A compound having a structure was found. Then, various organic electroluminescence devices were prototyped using the compound, and the characteristics of the devices were intensively evaluated. As a result, the present invention was completed.
- the present invention is a compound having a triphenylsilyl group and a triarylamine structure represented by the following general formula (1), and having a pair of electrodes and at least one organic layer sandwiched therebetween,
- a compound having a triphenylsilyl group and a triarylamine structure represented by the following general formula (1) is used as a constituent material of at least one organic layer: .
- X and Y may be the same or different from each other and represent a divalent group of a substituted or unsubstituted aromatic hydrocarbon, and Ar1 and Ar2 may be the same or different from each other, and are substituted or unsubstituted.
- It represents a divalent group represented by structural formulas (B) to (H) or a single bond.
- R1 is a fluorine atom, a chlorine atom, a trifluoromethyl group, a linear or branched alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted group
- r 1 represents an integer of 0 to 4; When it is 0, it represents that it is not substituted with R1, and n1 represents an integer of 1 to 2.
- n1 is 2, a plurality of r1s may be different from each other. To do.
- R2 represents a fluorine atom, a chlorine atom, a trifluoromethyl group, a linear or branched alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted group; It represents an aromatic heterocyclic group or a substituted or unsubstituted condensed polycyclic aromatic group, and when two or more R2 are present, they may be different from each other, and n2 represents 0 or 1. Also, n2 represents 0. When r2 is 0, r2 represents an integer of 0 to 6, and when r2 is 0, it is not substituted with R2. When n2 is 1, r2 represents an integer of 0 to 8, and r2 is If it is 0, it is not substituted with R2.)
- R3 represents a fluorine atom, a chlorine atom, a trifluoromethyl group, a linear or branched alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted group
- r 3 represents an integer of 0 to 10; If it is 0, it means that it is not substituted with R3.
- R4 and R5 may be the same or different from each other, and are a fluorine atom, a chlorine atom, a trifluoromethyl group, a linear or branched alkyl group having 1 to 6 carbon atoms, substituted or unsubstituted Represents an aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group or a substituted or unsubstituted condensed polycyclic aromatic group, and when there are a plurality of R4 or R5, each may be different from each other And r4 and r5 represent an integer of 0 to 4, and when r4 or r5 is 0, they are not substituted with R4 or R5.)
- R6 is a fluorine atom, a chlorine atom, a trifluoromethyl group, a linear or branched alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted group
- R7 is a fluorine atom, a chlorine atom, a trifluoromethyl group, a linear or branched alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted group; Represents an aromatic heterocyclic group or a substituted or unsubstituted condensed polycyclic aromatic group, and when a plurality of R7 are present, they may be different from each other; r7 represents an integer of 0 to 12; If it is 0, it means that it is not substituted with R7.)
- “aromatic hydrocarbon group” “aromatic heterocyclic group” or “fused polycyclic aromatic group” of the “aromatic heterocyclic group” or “substituted or unsubstituted condensed polycyclic aromatic group”
- examples of Ar1 to Ar2 bonded to each other to form a ring structure include carbazole ring, pyridoindole ring, dipyridopyrrole ring, dipyridoimidazole ring, and pyrimidobenzimidazole ring.
- Specific examples of the “substituent” in the “substituted condensed polycyclic aromatic group” include a fluorine atom, a chlorine atom, a trifluoromethyl group, a linear or branched alkyl group having 1 to 6 carbon atoms, and a phenyl group.
- substituted amino group the same “aromatic hydrocarbon group”, “aromatic heterocyclic group” or “condensed polycyclic aromatic” as those mentioned in the above R1 to R7 and Ar1 to Ar2 Group ”.
- linear or branched alkyl group having 1 to 6 carbon atoms represented by R1 to R7 present in the structural formulas (B) to (H) include a methyl group, ethyl Group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, t-butyl group, n-pentyl group, i-pentyl group, t-pentyl group, n-hexyl group, i-hexyl And t-hexyl group.
- substituted aromatic hydrocarbon group and “substituted aromatic heterocyclic group” represented by general formula (1) and R1 to R7 and Ar1 to Ar2 present in the structural formulas (B) to (H).
- substituted condensed polycyclic aromatic group “linear or branched alkyl group having 1 to 6 carbon atoms” includes the same ones as described above.
- the “divalent group of substituted or unsubstituted aromatic hydrocarbon” represented by X and Y in the general formula (1) is a divalent group formed by removing two hydrogen atoms from benzene, naphthalene, anthracene, etc. Group.
- the “substituent” of the “substituted aromatic hydrocarbon divalent group” includes the “substituted aromatic hydrocarbon group” and “substituted aromatic heterocyclic group” mentioned in the above R1 to R7 and Ar1 to Ar2. Or the thing similar to what was mention
- the compound represented by the general formula (1) of the present invention which has a triphenylsilyl group and a triarylamine structure, is a novel compound, and has an excited triplet level higher than that of a conventional electron blocking layer material, and an excellent triplet. It has the ability to confine the term exciton and the thin film state is stable.
- the compound having a triphenylsilyl group and a triarylamine structure represented by the general formula (1) of the present invention is used in the light-emitting layer or the electronic device layer of an organic electroluminescence device (hereinafter abbreviated as an organic EL device). It can be used as a constituent material.
- an organic EL device organic electroluminescence device
- the compound having a triphenylsilyl group and a triarylamine structure of the present invention is useful as an electron-blocking compound for an organic EL device or a host compound for a light-emitting layer, and an organic EL device is produced using the compound.
- an organic EL element having high luminous efficiency, high luminance, and low driving voltage can be obtained.
- FIG. 1 is a 1H-NMR chart of the compound of Example 1 of the present invention (Compound 25).
- FIG. 5 is a diagram showing EL element configurations of Examples 5 to 7 and Comparative Example 1.
- the compound having a triphenylsilyl group and a triarylamine structure according to the present invention is a novel compound.
- These compounds include, for example, anticiann reaction of bis (iodophenyl) fluorene and a corresponding arylamine or an amino acid using a palladium catalyst.
- the corresponding [(arylamino) phenyl]-(iodophenyl) fluorene can be synthesized by, for example, a lithiation reaction, and further, after lithiation with n-butyllithium, triphenylsilyl chloride is reacted with triphenylsilyl chloride.
- a compound having a silyl group and a triarylamine structure can be synthesized.
- the melting point and glass transition point were measured using a powder and a high-sensitivity differential scanning calorimeter DSC3100S manufactured by Bruker AXS.
- the work function was measured using an atmospheric photoelectron spectrometer AC-3 manufactured by Riken Keiki Co., Ltd., by forming a 100 nm thin film on the ITO substrate.
- the work function is an index of hole transport ability and hole blocking ability.
- the excited triplet energy level of the compound of the present invention can be calculated from the measured phosphorescence spectrum.
- the phosphorescence spectrum can be measured using a commercially available spectrophotometer.
- As a general phosphorescence spectrum measurement method it is dissolved in a solvent and irradiated with excitation light at a low temperature (for example, see Non-Patent Document 6), or vapor deposited on a silicon substrate to form a thin film at a low temperature.
- a method of irradiating excitation light and measuring a phosphorescence spectrum see, for example, Patent Document 1).
- the excited triplet level can be calculated by reading the wavelength of the first peak on the short wavelength side of the phosphorescence spectrum or the wavelength of the rising position on the short wavelength side and converting it to the light energy value according to the following equation.
- the excited triplet level is an indicator of the confinement of triplet excitons in the phosphorescent emitter.
- E is the value of light energy
- h Planck's constant (6.63 ⁇ 10 ⁇ 34 Js)
- c is the speed of light (3.00 ⁇ 10 8 m / s)
- ⁇ is the short wavelength of the phosphorescence spectrum. This represents the wavelength (nm) of the rising position on the side.
- 1 eV becomes 1.60 ⁇ 10 ⁇ 19 J.
- an anode As the structure of the organic EL device of the present invention, on the substrate sequentially, an anode, a hole injection layer, a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer, a cathode, Further, there may be mentioned those having an electron injection layer between the electron transport layer and the cathode.
- an anode, a hole transport layer, a light emitting layer, an electron transport layer, and a cathode can be sequentially formed on the substrate.
- the light emitting layer, the hole transport layer, and the electron transport layer may have a structure in which two or more layers are stacked.
- the material usually used for the layer is further doped with trisbromophenylamine hexachloroantimony, or N, N′-diphenyl-N, N ′
- TPD trisbromophenylamine hexachloroantimony
- a material usually used for the layer and further doped with a metal such as cesium can be used.
- an electrode material having a large work function such as ITO or gold is used.
- a material such as a naphthalene diamine derivative or a starburst type triphenylamine derivative or a coating type material can be used for the hole injection layer.
- TPD in addition to a compound containing m-carbazolylphenyl group, TPD, N, N′-diphenyl-N, N′-di ( ⁇ -naphthyl) benzidine (abbreviated as NPD) Bis [N, N-di (p-tolyl) -4-aminophenyl] cyclohexane (abbreviated as TPAC) can be used.
- NPD N, N′-diphenyl-N, N′-di ( ⁇ -naphthyl) benzidine
- TPAC Bis [N, N-di (p-tolyl) -4-aminophenyl] cyclohexane
- a compound having a triphenylsilyl group and a triarylamine structure represented by the general formula (1) of the present invention can be used.
- the light emitting layer of the organic EL device of the present invention is produced by doping a hole injecting / transporting host material with a light emitter called a guest material.
- a compound having a triphenylsilyl group and a triarylamine structure represented by the general formula (1) of the present invention, TPBI exhibiting electron transport properties, and a triazole compound PyTAZ-02 represented by the following formula are used as a host material of a light emitting layer. Can be used.
- the guest material used for the light emitting layer of the organic EL device of the present invention may be a fluorescent light emitter or a phosphorescent light emitter.
- a fluorescent light emitter such as a rubrene derivative, anthracene derivative, or coumarin derivative can be used.
- phosphorescent emitters include green phosphorescent emitters such as iridium complexes of phenylpyridine (Ir (ppy) 3), blue phosphorescent emitters such as FIrpic and FIr6, and red phosphorescent emitters such as Btp2Ir (acac). Can be used.
- the guest material which is a phosphorescent material causes concentration quenching, it is preferably doped by co-evaporation in the range of 1 to 30 weight percent with respect to the entire light emitting layer.
- an element having a structure in which a light-emitting layer manufactured using a compound having a different work function as a host material is stacked adjacent to a light-emitting layer manufactured using the compound of the present invention can be manufactured (for example, non-patented). Reference 7).
- a phenanthroline derivative such as BCP, aluminum (III) bis (2-methyl-8-quinolinato) -4-phenylphenolate (hereinafter abbreviated as BAlq)
- BAlq aluminum (III) bis (2-methyl-8-quinolinato) -4-phenylphenolate
- the electron injection layer of the organic EL device of the present invention includes, for example, lithium fluoride, but this can be omitted in the preferred selection of the electron transport layer and the cathode.
- an electrode material having a low work function such as aluminum or an alloy of magnesium and silver is used.
- the compound of the present invention exhibits a glass transition point of 100 ° C. or higher and is stable in a thin film state.
- the compound of the present invention has a suitable energy level as compared with CBP generally used as a host compound in the light emitting layer.
- a 1.0 ⁇ 10 ⁇ 5 mol / L 2-methyltetrahydrofuran solution was prepared for the compound of the present invention.
- the prepared solution was put into a dedicated quartz tube, pure oxygen was passed through to remove oxygen, and a septum rubber stopper was used to prevent further oxygen contamination.
- a phosphorescence spectrum was measured by irradiating excitation light using a fluorescent phosphorescence spectrophotometer (manufactured by Horiba, Ltd., FluoroMax-4 type). The wavelength at the rising position on the short wavelength side of the phosphorescence spectrum was read, and the excited triplet level was calculated by converting the wavelength value into light energy.
- Excited triplet level Compound of Example 1 of the invention 3.06 eV CBP 2.56eV FIrpic 2.62eV
- the compound of the present invention has a value larger than the triplet energy of commonly used blue phosphorescent materials such as FIrpic and CBP, and sufficiently confines the triplet energy excited in the light emitting layer. Has the ability.
- the organic EL element has a hole transport layer 3, an electron blocking layer 4, a light emitting layer 5, and an electron transport layer 6 on a glass substrate 1 on which an ITO electrode is previously formed as a transparent electrode 2.
- the electron injection layer 7 and the cathode (aluminum electrode) 8 were deposited in this order.
- the glass substrate 1 having a 150 nm-thick ITO film formed thereon was washed with an organic solvent, the surface was washed by oxygen plasma treatment. Then, this glass substrate with an ITO electrode was mounted in a vacuum vapor deposition machine and the pressure was reduced to 0.001 Pa or less.
- NPD was formed as a hole transport layer 3 so as to cover the transparent electrode 2 so as to have a film thickness of 40 nm at a deposition rate of 1.0 cm / sec.
- the compound (compound 25) of Example 1 of the present invention was formed as the electron blocking layer 4 so as to have a film thickness of 10 nm at a deposition rate of 1.0 kg / sec.
- Binary vapor deposition was performed at a vapor deposition rate to form a film thickness of 20 nm.
- Alq was formed as the electron transport layer 6 so as to have a film thickness of 45 nm at a deposition rate of 1.0 ⁇ / sec.
- lithium fluoride was formed as the electron injection layer 7 so as to have a film thickness of 0.5 nm at a deposition rate of 0.1 ⁇ / sec.
- aluminum was deposited to a thickness of 150 nm to form the cathode 8.
- the characteristic measurement was performed at normal temperature in air
- Table 1 summarizes the measurement results of the light emission characteristics when a DC voltage was applied to the organic EL device produced using the compound of Example 1 (Compound 25) of the present invention.
- the external quantum efficiency when a current density of 100 mA / cm 2 was passed was 3.0%.
- the external quantum efficiency when a current having a current density of 2.0 mA / cm 2 was passed was 14.7%.
- Example 1 For comparison, an organic EL element was produced under the same conditions as in Example 5 by replacing the material of the electron blocking layer 4 in Example 5 with CBP. About the produced organic EL element, the characteristic measurement was performed at normal temperature in air
- Example 5 the compound of Example 1 of the present invention (Compound 25) and the blue phosphor phosphor FIrpic were deposited on the electron blocking layer 4, and the compound of the Example 1 of the present invention (Compound 25):
- FIrpic Binary vapor deposition is performed at a vapor deposition rate of 94: 6, a thin film is formed to a thickness of 10 nm, and the triazole compound PyTAZ-02 (compound 41) and the blue phosphor phosphor FIrpic are further deposited thereon.
- An organic EL element was produced in the same manner. About the produced organic EL element, the characteristic measurement was performed at normal temperature in air
- Example 5 an organic EL device was produced in the same manner as in Example 5 except that the TPBI was formed as the electron transport layer 6 so as to have a film thickness of 45 nm at a deposition rate of 1.0 ⁇ / sec.
- the characteristic measurement was performed at normal temperature in air
- the compound of the present invention has a high excited triplet level, transfers energy well to the phosphorescent emitter, completely confines the triplet excitons of the phosphorescent emitter, and the host compound of the emitting layer It can also be said that it is excellent as an electron blocking compound.
- the compound having a triphenylsilyl group and a triarylamine structure of the present invention has a high excited triplet level and completely confines the triplet exciton of the phosphorescent emitter. Excellent as a compound.
- the luminance and light emission efficiency of the conventional organic EL element can be remarkably improved, and thus the performance of the mobile electronic product can be improved.
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Abstract
Description
1993年にプリンストン大学のM.A.Baldoらは、イリジウム錯体を用いた燐光発光素子によって8%の外部量子効率を実現させた。
非特許文献2:応用物理学会有機分子バイオエレクトロニクス分科会第9回講習会、17(2001)
非特許文献3:株式会社オーム社、有機ELディスプレイ、90(2005)
非特許文献4:SID07DIGEST 837(2007)
非特許文献5:応用物理学会有機分子バイオエレクトロニクス分科会会誌,14(1),23(2003)
また、一般式(1)および前記構造式(B)~(H)中に存在するR1~R7およびAr1~Ar2で表される、「置換芳香族炭化水素基」、「置換芳香族複素環基」または「置換縮合多環芳香族基」の「置換基」である「炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基」として、前記したものと同様のものがあげられる。
窒素雰囲気下、反応容器に9,9-ビス(4-ヨードフェニル)-9H-フルオレン27.0g、カルバゾール8.0g、銅粉1.5g、炭酸カリウム13.1g、ジメチルスルホキシド0.7ml、o-ジクロロベンゼン200mlを加えて加熱し、160℃で2時間攪拌した。室温まで冷却し、トルエン300mlを加えた後、再び加熱し、80℃で1時間攪拌した。不溶物をろ過によって除き、ろ液を減圧下濃縮して粗製物を得た。粗製物をカラムクロマトグラフ(担体:シリカゲル、溶離液:ヘキサン/クロロホルム)によって精製し、9-[4-(カルバゾール-9-イル)フェニル]-9-(4-ヨードフェニル)-9H-フルオレン12.2g(収率42%)の白色粉体を得た。
融点 ガラス転移点
本発明実施例1の化合物 339℃ 142℃
仕事関数
本発明実施例1の化合物 5.80eV
CBP 6.00eV
励起三重項レベル
本発明実施例1の化合物 3.06eV
CBP 2.56eV
FIrpic 2.62eV
また、電流密度100mA/cm2の電流を流したときの外部量子効率は3.0%であった。
そして、電流密度2.0mA/cm2の電流を流したときの外部量子効率は14.7%であった。
比較のために、実施例5における電子阻止層4の材料をCBPに代え、実施例5と同様の条件で有機EL素子を作製した。作製した有機EL素子について、大気中、常温で特性測定を行なった。
作製した有機EL素子に直流電圧を印加したときの発光特性の測定結果を表1にまとめて示した。
2 透明電極
3 正孔輸送層
4 電子阻止層
5 発光層
6 電子輸送層
7 電子注入層
8 陰極
Claims (7)
- 下記一般式(1)で表されるトリフェニルシリル基とトリアリールアミン構造を有する化合物。
(式中、X、Yは相互に同一でも異なってもよく、置換もしくは無置換の芳香族炭化水素の2価基を表し、Ar1、Ar2は相互に同一でも異なってもよく、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基であって、互いに結合して環構造を形成していてもよい。Aは下記構造式(B)~(H)で示される2価基、または単結合を表す。)
(式中、R1はフッ素原子、塩素原子、トリフルオロメチル基、炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基を表し、R1が複数個存在する場合は相互に異なっていてもよいものとし、r1は0~4の整数を表し、r1が0である場合はR1で置換されていないことを表す。n1は1ないし2の整数を表す。ここで、n1が2である場合、複数個存在するr1は相互に異なっていてもよいものとする。)
(式中、R2はフッ素原子、塩素原子、トリフルオロメチル基、炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基を表し、R2が複数個存在する場合は相互に異なっていてもよいものとし、n2は0または1を表す。またn2が0である場合、r2は0~6の整数を表し、r2が0である場合はR2で置換されていないことを表す。n2が1である場合、r2は0~8の整数を表し、r2が0である場合はR2で置換されていないことを表す。)
(式中、R3はフッ素原子、塩素原子、トリフルオロメチル基、炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基を表し、R3が複数個存在する場合は相互に異なっていてもよいものとし、r3は0~10の整数を表し、r3が0である場合はR3で置換されていないことを表す。)
(式中、R4およびR5は相互に同一でも異なってもよく、フッ素原子、塩素原子、トリフルオロメチル基、炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基を表し、R4またはR5が複数個存在する場合はそれぞれが相互に異なっていてもよいものとし、r4およびr5は0~4の整数を表し、r4またはr5が0である場合はR4またはR5で置換されていないことを表す。)
(式中、R6はフッ素原子、塩素原子、トリフルオロメチル基、炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基を表し、R6が複数個存在する場合は相互に異なっていてもよいものとし、r6は0~5の整数を表し、r6が0である場合はR6で置換されていないことを表す。)
(式中、R7はフッ素原子、塩素原子、トリフルオロメチル基、炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基を表し、R7が複数個存在する場合は相互に異なっていてもよいものとし、r7は0~12の整数を表し、r7が0である場合はR7で置換されていないことを表す。) - 前記一般式(1)においてAが下記一般式(E)で表される、請求項1記載のトリフェニルシリル基とトリアリールアミン構造を有する化合物。
(式中、R4およびR5は相互に同一でも異なってもよく、フッ素原子、塩素原子、トリフルオロメチル基、炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基を表し、R4またはR5が複数個存在する場合はそれぞれが相互に異なっていてもよいものとし、r4およびr5は0~4の整数を表し、r4またはr5が0である場合はR4またはR5で置換されていないことを表す。) - 一対の電極とその間に挟まれた少なくとも一層の有機層を有する有機エレクトロルミネッセンス素子において、下記一般式(1)で表されるトリフェニルシリル基とトリアリールアミン構造を有する化合物が、少なくとも1つの有機層の構成材料として用いられていることを特徴とする有機エレクトロルミネッセンス素子。
(式中、X、Yは相互に同一でも異なってもよく、置換もしくは無置換の芳香族炭化水素の2価基を表し、Ar1、Ar2は相互に同一でも異なってもよく、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基であって、互いに結合して環構造を形成していてもよい。Aは下記構造式(B)~(H)で示される2価基、または単結合を表す。)
(式中、R1はフッ素原子、塩素原子、トリフルオロメチル基、炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基を表し、R1が複数個存在する場合は相互に異なっていてもよいものとし、r1は0~4の整数を表し、r1が0である場合はR1で置換されていないことを表す。n1は1ないし2の整数を表す。ここで、n1が2である場合、複数個存在するr1は相互に異なっていてもよいものとする。)
(式中、R2はフッ素原子、塩素原子、トリフルオロメチル基、炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基を表し、R2が複数個存在する場合は相互に異なっていてもよいものとし、n2は0または1を表す。またn2が0である場合、r2は0~6の整数を表し、r2が0である場合はR2で置換されていないことを表す。n2が1である場合、r2は0~8の整数を表し、r2が0である場合はR2で置換されていないことを表す。)
(式中、R3はフッ素原子、塩素原子、トリフルオロメチル基、炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基を表し、R3が複数個存在する場合は相互に異なっていてもよいものとし、r3は0~10の整数を表し、r3が0である場合はR3で置換されていないことを表す。)
(式中、R4およびR5は相互に同一でも異なってもよく、フッ素原子、塩素原子、トリフルオロメチル基、炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基を表し、R4またはR5が複数個存在する場合はそれぞれが相互に異なっていてもよいものとし、r4およびr5は0~4の整数を表し、r4またはr5が0である場合はR4またはR5で置換されていないことを表す。)
(式中、R6はフッ素原子、塩素原子、トリフルオロメチル基、炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基を表し、R6が複数個存在する場合は相互に異なっていてもよいものとし、r6は0~5の整数を表し、r6が0である場合はR6で置換されていないことを表す。)
(式中、R7はフッ素原子、塩素原子、トリフルオロメチル基、炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基または置換もしくは無置換の縮合多環芳香族基を表し、R7が複数個存在する場合は相互に異なっていてもよいものとし、r7は0~12の整数を表し、r7が0である場合はR7で置換されていないことを表す。) - 前記有機層が電子阻止層であり、前記一般式(1)で表される化合物が、該電子阻止層中に、少なくとも一つの構成材料として用いられていることを特徴とする請求項3記載の有機エレクトロルミネッセンス素子。
- 前記有機層が発光層であり、前記一般式(1)で表される化合物が、該発光層中に、少なくとも一つの構成材料として用いられていることを特徴とする請求項3記載の有機エレクトロルミネッセンス素子。
- 少なくとも2種類の発光層を順次積層してなる有機エレクトロルミネッセンス素子において、前記一般式(1)で表される化合物が、前記発光層の一方に、少なくとも一つの構成材料として用いられていることを特徴とする請求項3または6記載の有機エレクトロルミネッセンス素子。
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JP2010536703A JPWO2010052932A1 (ja) | 2008-11-07 | 2009-11-09 | トリフェニルシリル基とトリアリールアミン構造を有する化合物および有機エレクトロルミネッセンス素子 |
EP09824632A EP2351760A4 (en) | 2008-11-07 | 2009-11-09 | CONNECTION WITH TRIPHENYLSILYLGRUPPE AND TRIARYLAMINE STRUCTURE AND ORGANIC ELECTROLUMINESCENE ELEMENT |
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KR20200104977A (ko) * | 2019-02-27 | 2020-09-07 | 삼성디스플레이 주식회사 | 화합물 및 이를 포함하는 유기 발광 소자 |
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Also Published As
Publication number | Publication date |
---|---|
CN102203105A (zh) | 2011-09-28 |
TW201026643A (en) | 2010-07-16 |
EP2351760A1 (en) | 2011-08-03 |
US10059725B2 (en) | 2018-08-28 |
KR20110081274A (ko) | 2011-07-13 |
US20110220881A1 (en) | 2011-09-15 |
JPWO2010052932A1 (ja) | 2012-04-05 |
EP2351760A4 (en) | 2012-03-21 |
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