WO2006051810A1 - 金属錯体化合物及びそれを用いた有機エレクトロルミネッセンス素子 - Google Patents
金属錯体化合物及びそれを用いた有機エレクトロルミネッセンス素子 Download PDFInfo
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Definitions
- the present invention relates to a novel metal complex compound and an organic electoluminescence device using the same, and in particular, an organic electoluminescence capable of obtaining blue light emission with high emission efficiency and short wavelength light emission and high color purity.
- the present invention relates to a device and a metal complex compound that realizes the device.
- Non-patent Document 1 Non-patent Document 1
- Non-patent document 2 Non-patent document 3
- the emission wavelength obtained from Compound C is 600 nm red light emission and not blue light emission. If such a complex using a tridentate chelate ligand can realize a blue-range light emission complex, there is a possibility of developing a new technology.
- Non-Patent B ⁇ l D.F. O'Brien and M.A.Baldo et al Improved energy transferin electro phosphorescent devices "Applied Physics letters Vol.74 No.3, pp442-444, January 18, 1999
- Non-Patent Document 2 M.A.Baldo et al "Very high-efficiencygreen organic light-emitting dev ices based on electrophosphorescence" Applied Physics letters Vol. 75 No. l, pp4-6, July 5, 1999
- Non-Patent Document 3 J-P. Collin et.al., J.Am.Chem.Soc, 121,5009 (1999)
- An object of the present invention is to provide an organic EL device capable of obtaining blue light emission with high color purity and a metal complex compound realizing the same.
- the present invention provides a metal complex compound having a partial structure represented by the following general formula (I) having a tridentate chelate ligand and a cyano group as a ligand.
- L is a compound or atomic group containing any atom of Groups 13 to 17 of the Periodic Table
- A is a nitrogen-containing heterocyclic group having 2 to 20 carbon atoms that may have a substituent, wherein the circle surrounding the symbol A represents a cyclic structure containing a nitrogen atom (N),
- n is:! ⁇ 3
- m is an integer of 0 ⁇ 2
- R 1 to R 4 may each independently have a hydrogen atom, a cyano group, a halogen atom, or a substituent, an alkynole group having carbon atoms:! To 12 or a substituent.
- Carbon number:! ⁇ 12 alkyl amino group, optionally having 6-20 carbon atoms aryl group, optionally having 1-12 carbon atoms alkoxy group, having substituents C1-C12 halogenated alkoxy group which may have, C6-C20 aryloxy group which may have a substituent, C6-C20 aromatic hydrocarbon which may have a substituent Group, optionally substituted heterocyclic group having 3 to 20 carbon atoms, optionally having 1 to 12 carbon atoms, halogenated alkyl group, substituted Group having 2 to 12 carbon atoms, an alkenyl group having 12 or more substituents, an alkynyl group having 2 to 12 carbons, or an optionally substituted carbon number 3 to 20 cycloalkyl groups, R
- the present invention provides an organic EL device having at least one organic thin film layer having at least one light emitting layer sandwiched between a pair of electrodes, and at least one layer of the organic thin film layer.
- the present invention provides an organic EL device that contains the metal complex compound and emits light when a voltage is applied between both electrodes.
- the present invention provides an organic EL device capable of obtaining blue light emission with high color purity by light emission at a short wavelength and a metal complex compound realizing the same.
- FIG. 1 is a diagram showing the measurement results of the emission spectrum of the metal complex compound produced in Synthesis Example 1.
- the metal complex compound of the present invention has a partial structure represented by the following general formula (I).
- M is a metal atom in Groups 7 to 12 of the Periodic Table, for example, Re (rhenium), Ir (iridium), Pt (platinum), Rh (rhodium) , Os (Osmium), Ru (Noretenium), Co (Cobalt), Cu (Copper), Zn (Zinc) atoms, etc.
- Re rhenium
- Ir iridium
- Pt platinum
- Rh rhodium
- Os Os
- Ru Noretenium
- Co Cobalt
- Cu Copper
- Zn (Zinc) atoms etc.
- Group 9 metal atoms, Re and Pt are preferred. Ir, Re, and Pt are particularly preferable.
- n is:! To 3
- m is an integer of 0 to 2
- L is a compound containing any atom of Group 13 to 17 of the Periodic Table or an atomic group containing any atom of Group 13 to 17 of the Periodic Table It is.
- Periodic Tables 13 to 17 included in this L B (boron), A1 (aluminum), C (carbon), N (nitrogen), ⁇ (oxygen), Si (caine) , P (phosphorus), S (sulfur), Ge (germanium), As (arsenic), Se (selenium), F (fluorine), C1 (chlorine), Br (bromine), I (iodine) atoms, etc.
- P, As, Sb, and N are preferable.
- the compound or atomic group represented by L includes PR, AsR, SbR, NR, OR, CO, a halogen atom, a substituent, a heterocycle having 2 to 20 carbon atoms, and It is preferable that they are at least one selected from the combination of these to form a bidentate chelate ligand.
- the halogen atom include fluorine, chlorine, bromine and iodine atoms.
- heterocyclic ring having 2 to 20 carbon atoms examples include imidazole, benzimidazole, pyrrole, furan, thiophene, benzothiophene, oxadiazoline, dipheninoleanthracene, indoline, carbazole, pyridine, quinoline, isoquinoline, benzoquinone, villa Examples include rosin, imidazolidine and piperidine.
- R is a hydrogen atom, a cyano group, a halogen atom, an optionally substituted alkyl group having 1 to 12 carbon atoms, an optionally substituted alkyl group having 1 to 12 carbon atoms, C6-C20 arylamino group which may have a substituent, Carbon number which may have a substituent:! -12 Alkoxy group, C1-C12 which may have a substituent A halogeno alkoxy group, an optionally substituted aryloxy group having 6 to 20 carbon atoms, an optionally substituted aromatic hydrocarbon group having 6 to 20 carbon atoms, and a substituent.
- C3-C20 heterocyclic group optionally having 1 to 12 carbon atoms, a halogenoalkyl group having 12 to 12 carbon atoms having a substituent: 12 to 12 anorekenino groups, substituents C2-C12 alkynyl group which may have, or C3-C20 cycloalkyl which may have a substituent
- the number of R may be plural, and the plural R may be the same or different.
- halogen atom examples include fluorine, chlorine, bromine and iodine atoms.
- alkyl group examples include methinole group, ethyl group, propyl group, isopropylinole group, n_butyl group, s_butyl group, isobutyl group, t_butyl group, n_pentyl group, n_hexyl group, n —Heptyl group, n —octyl group and the like can be mentioned.
- aromatic hydrocarbon group include residues such as benzene, naphthalene, anthracene, phenanthrene, pyrene, biphenyl, terphenyl, and fluoranthene.
- heterocyclic group examples include those having 2 to 20 carbon atoms. Residues of those listed in the ring are listed.
- alkylamino group examples include those in which a hydrogen atom of an amino group is substituted with the alkyl group.
- arylamino group examples include those in which a hydrogen atom of an amino group is replaced with the aromatic hydrocarbon group.
- the alkoxy group is represented as OY ′, and Y ′ includes the same as those mentioned for the alkyl group.
- halogenated alkoxy group examples include those in which a hydrogen atom of the alkoxy group is substituted with the halogen atom.
- the aryloxy group is represented as OY ′′, and Y ′′ includes the same groups as those described for the aromatic hydrocarbon group.
- halogenated alkyl group examples include those in which a hydrogen atom of the alkyl group is substituted with the halogen atom.
- alkenyl group examples include a bur group, a allyl group, a 2 butyr group, and a 3 pentenyl group.
- alkynyl group examples include an ether group, a methyl ether group, and the like.
- cycloalkyl group examples include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, and the like.
- substituents of these groups include halogen atoms, hydroxyl groups, substituted or unsubstituted amino groups, nitro groups, cyan groups, substituted or unsubstituted alkyl groups, fluorine-substituted alkyl groups, substituted or unsubstituted groups.
- Alkenyl group, substituted or unsubstituted cycloalkyl group, substituted or unsubstituted alkoxyl group, substituted or unsubstituted heterocyclic group, substituted or unsubstituted arylalkyl group, substituted or unsubstituted aryloxy group, substituted Or an unsubstituted alkoxycarbonyl group, a carboxy nole group, etc. are mentioned.
- X and Y are independently 0 (oxygen), S (sulfur), N (nitrogen), P (phosphorus) ), As (arsenic) or Sb (antimony) atoms.
- T and E are each independently N, P, As, or Sb atoms.
- R 5 to R 28 are each independently a hydrogen atom, a cyan group, a halogen atom, or a carbon number that may have a substituent:! Alkyl group, may have a substituent, carbon number:!
- To 12 anolequinolamino group may have a substituent, 6 to 20 carbon atom arylamino group, substituent C1-C12 alkoxy group which may have, C1-C12 halogenated alkoxy group which may have a substituent, C6-C20 which may have a substituent
- C1-C12 halogenated alkyl group C2-C12 alkenyl group which may have a substituent
- Examples of the cyclic structure that may be bonded to each other among R 5 to R 28 to form a cyclic structure include, for example, cycloalkane (for example, cyclopropane, cyclobutane, cyclopropane, cyclopropane). Hexane, cycloheptane, etc.), aromatic hydrocarbon rings (eg benzene, naphthalene, anthracene, phenanthrene, pyrene, biphenyl, terphenyl, fluoranthene, etc.) and heterocycles (eg imidazole, benzimidazole, pyrrole, furan).
- cycloalkane for example, cyclopropane, cyclobutane, cyclopropane, cyclopropane.
- aromatic hydrocarbon rings eg benzene, naphthalene, anthracene,
- Ph is a phenyl group.
- A represents a cyclic structure containing a nitrogen atom (N) indicated by a circle surrounding symbol A, and may have a substituent.
- N nitrogen atom
- 20 nitrogen-containing heterocyclic groups include imidazole, benzimidazole, pyrrole, indoline, carbazole, pyridine, quinoline, isoquinoline, pyrarodine, imidazolidine, piperidine and the like, with pyridine being preferred.
- R 1 to R 4 are each independently the same as the above to R 28, and specific examples and substituents of these groups are the same as those described for R above. It is.
- examples of the cyclic structure in which R 1 , R 3 and R 4 may be bonded to each other to form a cyclic structure are the same as those described for R 5 to R 28 above.
- the tridentate chelate ligand is preferably a compound represented by the following general formula (7) or (8).
- R 29 to R 35 and R 36 to R 46 are each independently the same as the above R 1 to R 4, and specific examples and substitutions of these groups The group is the same as described for R above.
- Examples of the cyclic structure that may be bonded to each other among R 29 to R 35 and R 36 to R 46 to form a cyclic structure are those described in R 5 to R 28 above. Is the same as
- the tridentate chelate ligand is preferably any of the following compounds.
- the metal complex compound of the present invention is preferably one represented by the following general formula (I 1) or (I 2).
- metal complex compound of the present invention is illustrated below, but are not limited to these exemplary compounds.
- the organic EL device of the present invention is an organic EL device in which an organic thin film layer comprising at least one light emitting layer or a plurality of layers is sandwiched between a pair of electrodes comprising an anode and a cathode. At least one layer contains the metal complex compound of the present invention, and emits light when a voltage is applied between both electrodes.
- the light emitting layer contains 1 to 30% by weight of the metal complex compound of the present invention, which is preferable if the light emitting layer contains the metal complex compound of the present invention.
- the light emitting layer is usually thinned by vacuum deposition or coating, but since the manufacturing process can be simplified by coating, the layer containing the metal complex compound of the present invention is formed by coating. This is preferable.
- the element structure of the organic EL element in the present invention is a structure in which one or two or more organic layers are laminated between electrodes. Examples thereof include (i) an anode, a light emitting layer, a cathode, and ( ⁇ ) Anode, hole injection 'transport layer, light emitting layer, electron injection ⁇ transport layer, cathode, (iii) anode, hole injection ⁇ transport layer, light emitting layer, cathode, (iv) anode, light emitting layer, electron injection ⁇ transport layer And a structure such as a cathode.
- the compound in the present invention can be doped into other hole transport materials, light emitting materials, and electron transport materials which may be used in any of the above organic layers.
- the method for forming each layer of the organic EL element is not particularly limited.
- the light emitting composition of the present invention is dissolved, or the compound forming the composition is dissolved.
- a light emitting medium or a light emitting layer can be formed by the method. It can be formed by a known method such as a solution dating method, a spin coating method, a casting method, a bar coating method, a roll coating method, or an ink jet method.
- each organic layer of the organic EL device of the present invention is not particularly limited, but in general, if the film thickness is too thin, defects such as pinholes occur, and conversely, if it is too thick, a high applied voltage is required, resulting in poor efficiency. Therefore, the range of several nm to 1 ⁇ m is usually preferable.
- solvents used in preparing a luminescent solution for forming a luminescent layer include dichloromethane, dichloroethane, chlorophenol, carbon tetrachloride, tetrachloroethane, trichloroethane, black benzene, dichlorobenzene, black chlorotoluene, and the like.
- Halogenated hydrocarbon solvents such as dibutyl ether, tetrahydrofuran, dioxane, and anisole, methanol and ethanol, propanol, butanol, pentanole, hexanol, cyclohexanol, methyl cepsolvol, and ethylcylsolve , Alcohol solvents such as ethylene glycol, hydrocarbon solvents such as benzene, toluene, xylene, ethylbenzene, hexane, octane, decane, ester solvents such as ethyl acetate, butyl acetate, amyl acetate, etc. And the like.
- ether solvents such as dibutyl ether, tetrahydrofuran, dioxane, and anisole, methanol and ethanol, propanol, butanol, pentanole, hexanol, cyclo
- halogenated hydrocarbon solvents and hydrocarbon solvents are preferable. These solvents may be used alone or in combination. Note that usable solvents are not limited to these. Further, the dopant may be dissolved in advance in the luminescent solution containing the above compound.
- the electron injecting / transporting material used in the present invention is not particularly limited, and any compound that is usually used as an electron injecting / transporting material may be used.
- any compound that is usually used as an electron injecting / transporting material may be used.
- Examples thereof include oxadiazole derivatives such as phenylene, triazole derivatives, and quinolinol-based metal complexes.
- the electron injection 'transport layer is made of an insulator or a semiconductor, current leakage can be effectively prevented and the electron injection property can be improved.
- insulators include alkali metal chalcogenides, alkaline earth metal chalcogenides, and alkali metal halides. And at least one metal compound selected from the group consisting of alkaline earth metal halides. If the electron injecting / transporting layer is composed of these alkali metal chalcogenides or the like, it is preferable in that the electron injecting property can be further improved.
- preferable alkali metal chalcogenides include, for example, Li 0, Na S and Na Se
- preferable alkaline earth metal chalcogenides include, for example, C aO, BaO, SrO, BeO, BaS. And CaSe.
- preferred alkali metal halides include, for example, LiF, NaF, KF, LiCl, KC1, and NaCl.
- preferred alkaline earth metal halides include, for example, CaF, BaF
- Fluorides such as SrF, MgF and BeF, and halides other than fluorides.
- the electron injection 'transport layer at least one of Ba, Ca, Sr, Yb, Al, Ga, In, Li, Na, Cd, Mg, Si, Ta, Sb, and Zn is used.
- the inorganic compound constituting the electron injection / transport layer is preferably a microcrystalline or amorphous insulating thin film. If the electron transport layer is composed of these insulating thin films, a more uniform thin film is formed, and pixel defects such as dark spots can be reduced. Examples of such inorganic compounds include the alkali metal chalcogenides, alkali earth metal chalcogenides, alkali metal halides and alkaline earth metal halides described above.
- the electron injection / transport layer may contain a reducing dopant having a work function of 2.9 eV or less.
- the reducing dopant is defined as a substance capable of reducing the electron transporting compound.
- various materials can be used as long as they have a certain reducibility, for example, alkali metals, alkaline earth metals, rare earth metals, alkali metal oxides, alkali metal halides, alkaline earth metals. At least selected from the group consisting of oxides, alkaline earth metal halides, rare earth metal oxides or rare earth metal halides, alkali metal organic complexes, alkaline earth metal organic complexes, rare earth metal organic complex forces One substance can be preferably used.
- preferable reducing dopants include Na (work function: 2.36 eV), K (work function: 2.28 eV), Rb (work function: 2.16 eV) and Cs (work Function: 1. 95 eV) Force At least one alkali metal selected from the group consisting of Ca (work function: 2.9 eV), Sr (work function: 2.0 to 2.5 eV) and Ba (work function: 2 52eV) at least one alkaline earth metal selected from the group of forces, with a work function of 2.9 eV is particularly preferred.
- a more preferable reducing dopant is at least one alkali metal selected from the group force consisting of K, Rb and Cs, more preferably Rb and Cs, and most preferably Cs. .
- alkali metals can improve the emission brightness and extend the lifetime of organic EL devices by adding a relatively small amount to the electron injection region, which has a particularly high reducing ability.
- a combination of two or more alkali metals is also preferable.
- a combination containing Cs for example, Cs and Na, Cs and K, Cs and Rb.
- a combination of Cs, Na and K is preferred.
- the anode of the organic EL element plays a role of injecting holes into the hole injection and transport layer and / or the light emitting layer, and it is effective to have a work function of 4.5 eV or more.
- Specific examples of the anode material used in the present invention include indium tin oxide alloy (ITO), tin oxide (NE SA), gold, silver, platinum, copper and the like.
- the cathode is preferably a material having a low work function for the purpose of injecting electrons into the electron injection / transport layer and / or the light emitting layer.
- a hole injection (transport) layer may be used on the anode.
- the hole injecting / transporting layer include various organic compounds generally used in organic EL devices described in, for example, JP-A-63-295695 and JP-A-2-191694. Products and polymers can be used. Examples thereof include aromatic tertiary amines, hydrazone derivatives, force rubazole derivatives, triazole derivatives, imidazole derivatives, polybutcarbazole, polyethylene dioxythiophene 'polysulfonic acid (PEDOT-PSS), and the like.
- the cathode material of the organic EL element is not particularly limited.
- aluminum, magnesium, magnesium indium alloy, magnesium-anoremium alloy, aluminum lithium alloy, aluminum scandium lithium alloy, or magnesium silver alloy can be used.
- the metal complex compound 2 was synthesized by the following route.
- the flask was placed in a 100 ml eggplant-shaped flask, and irradiated with microwaves intermittently in 4 minutes for 3 minutes using a 650 W microwave irradiation device (ZMW-007 type, manufactured by Shikoku Seikan Co., Ltd.). After allowing to cool to room temperature, 100 ml of pure water was added and stirred for 30 minutes. Thereafter, the supernatant was removed by centrifugation, and the precipitate was collected by filtration. After washing with black mouth form and jetyl ether, it was dried to obtain 0.05 g of Compound 2 as a yellow powder (yield 58%). The obtained compound was subjected to FD-MS (field desorption mass spectrum) measurement and confirmed to be the target compound. The results of FD-MS are shown below.
- Example 1 (Production of organic EL device)
- a glass substrate with a 25 mm ⁇ 75 mm ⁇ l. 1 mm thick IT ⁇ transparent electrode (Zomatic Co., Ltd.) was ultrasonically cleaned in isopropyl alcohol for 5 minutes, followed by UV ozone cleaning for 30 minutes.
- PED ⁇ T polyethylenedioxythiophene
- Complex compound 2 was mixed with 7% by weight of the following host material H, and nitrogen solution was published for 15 minutes.
- a film was formed by spin coating. This layer functions as a light emitting layer. The film thickness at this time was 50 nm.
- the following B Alq film having a thickness of 25 nm was formed on this film.
- This BAlq film functions as a hole barrier layer.
- the following Alq film having a thickness of 5 nm was formed on this film.
- This Alq film functions as an electron injection layer.
- lithium fluoride was evaporated to a thickness of 0.1 nm and then aluminum was evaporated to a thickness of 150 nm.
- This Al / LiF functions as a cathode. In this way, an organic EL device was produced. When the obtained device was sealed, an energization test was conducted.
- Example 1 an organic EL device was prepared in the same manner except that the metal complex compound D1 described in the publicly known document Inog.Chem., 6513 (2004) was used instead of the metal complex compound 2. After sealing the resulting device was subjected to a current test, the voltage 8. 8V, current density 0.1 at 68 mA / cm 2, CIE chromaticity emission luminance 101cd / m 2 (0. 51, 0. 48) orange light emission was obtained, and the light emission efficiency was 6.5 cd / A.
- Example 1 in place of the metal complex compound 2, except that the Ir (ttpy) Cl was used.
- the color is more blue. It becomes an organic EL device with high luminous efficiency.
- the organic EL device using the metal complex compound of the present invention can emit blue light with high color purity by light emission with a short wavelength with high luminous efficiency. Therefore, it can be applied to fields such as various display elements, displays, knock lights, illumination light sources, signs, signboards, interiors, etc., and is particularly suitable as a display element for color displays.
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JP2004326093A JP2006137676A (ja) | 2004-11-10 | 2004-11-10 | 金属錯体化合物及びそれを用いた有機エレクトロルミネッセンス素子 |
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DE102007024153A1 (de) * | 2007-04-23 | 2008-10-30 | Osram Opto Semiconductors Gmbh | Elektrisches organisches Bauelement und Verfahren zu seiner Herstellung |
CN110129034B (zh) * | 2019-05-24 | 2020-08-11 | 武汉华星光电半导体显示技术有限公司 | 蓝荧光材料及显示面板 |
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JP2002512729A (ja) * | 1997-05-07 | 2002-04-23 | エコール ポリテクニーク フェデラル ドゥ ローザンヌ | 金属複合体光増感剤および光起電力セル |
CN1359901A (zh) * | 2000-12-21 | 2002-07-24 | 中国科学院感光化学研究所 | 钌多吡啶配合物及其合成方法和用途 |
JP2003073355A (ja) * | 2001-09-04 | 2003-03-12 | Toyota Central Res & Dev Lab Inc | 金属錯体化合物及びこれを用いた有機電界発光素子 |
JP2003146996A (ja) * | 2000-09-26 | 2003-05-21 | Canon Inc | 発光素子、表示装置及び発光素子用金属配位化合物 |
JP2003147345A (ja) * | 2001-11-09 | 2003-05-21 | Takeko Matsumura | 高輝度有機イリジウム錯体を用いた有機エレクトロルミネッセンス材料及び有機エレクトロルミネッセンス素子 |
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US6548836B1 (en) * | 1999-04-29 | 2003-04-15 | Massachusetts Institute Of Technology | Solid state light-emitting device |
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JP2002512729A (ja) * | 1997-05-07 | 2002-04-23 | エコール ポリテクニーク フェデラル ドゥ ローザンヌ | 金属複合体光増感剤および光起電力セル |
JP2003146996A (ja) * | 2000-09-26 | 2003-05-21 | Canon Inc | 発光素子、表示装置及び発光素子用金属配位化合物 |
CN1359901A (zh) * | 2000-12-21 | 2002-07-24 | 中国科学院感光化学研究所 | 钌多吡啶配合物及其合成方法和用途 |
JP2003073355A (ja) * | 2001-09-04 | 2003-03-12 | Toyota Central Res & Dev Lab Inc | 金属錯体化合物及びこれを用いた有機電界発光素子 |
JP2003147345A (ja) * | 2001-11-09 | 2003-05-21 | Takeko Matsumura | 高輝度有機イリジウム錯体を用いた有機エレクトロルミネッセンス材料及び有機エレクトロルミネッセンス素子 |
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INDELLI M.T. ET AL: "Design of Long-Lived Ru(II) Terpyridine MLCT States. Tricyano Terpyridine Complexes", INORGANIC CHEMISTRY, vol. 37, no. 23, 16 November 1998 (1998-11-16), pages 6084 - 6089, XP002995289 * |
JING B.-W. ET AL: "Polypyridine ruthenium(II) complexes containing mixed ligands. Synthesis, spectroscopic and photophysical and electrochemical properties", DYES AND PIGMENTS, vol. 37, no. 2, 15 April 1998 (1998-04-15), pages 177 - 186, XP004115905 * |
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