WO2012138172A2 - 신규 유기금속 화합물 및 이를 이용한 유기 발광 소자 - Google Patents
신규 유기금속 화합물 및 이를 이용한 유기 발광 소자 Download PDFInfo
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- WO2012138172A2 WO2012138172A2 PCT/KR2012/002624 KR2012002624W WO2012138172A2 WO 2012138172 A2 WO2012138172 A2 WO 2012138172A2 KR 2012002624 W KR2012002624 W KR 2012002624W WO 2012138172 A2 WO2012138172 A2 WO 2012138172A2
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- 0 CCCCCC1*2C1C(CCCC*)CC2 Chemical compound CCCCCC1*2C1C(CCCC*)CC2 0.000 description 6
- IXPCGYRPYYJIEQ-UHFFFAOYSA-N C1=CO[C](c2ccccc2)O1 Chemical compound C1=CO[C](c2ccccc2)O1 IXPCGYRPYYJIEQ-UHFFFAOYSA-N 0.000 description 1
- TUBMGEQOUUYWDN-UHFFFAOYSA-N CC(CC(C)=[O]1)OC1=C Chemical compound CC(CC(C)=[O]1)OC1=C TUBMGEQOUUYWDN-UHFFFAOYSA-N 0.000 description 1
- GYHRAMLZCMFGFU-UHFFFAOYSA-N C[C]1OC=CO1 Chemical compound C[C]1OC=CO1 GYHRAMLZCMFGFU-UHFFFAOYSA-N 0.000 description 1
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Definitions
- the present invention relates to a novel organometallic compound, and more particularly, to a luminescent organometallic compound having improved luminescence properties by inhibiting intermolecular interactions by the introduction of germanium substituents, an organic electronic device using the same, and more particularly to an organic light emitting device will be.
- OLED Organic Light-Emitting Diode
- OLED is basically a structure in which an organic thin film including an organic light emitting layer is sandwiched between two electrodes, wherein at least one of the two electrodes is transparent and suitable between the two electrodes. It is a kind of organic electronic device that utilizes the light emitted from the visible light region from the organic light emitting layer when a voltage, generally, a voltage between 5 V and 10 V is applied.
- Such an organic light emitting device is basically a self-luminous device having a very thin thickness of several micrometers or less, including an electrode, and emitting light directly from the device itself.
- the response speed is high and the viewing angle is wide as a display device.
- the manufacturing process is simple and the flexible device using the organic thin film can be realized, and the device can be implemented not only in the vacuum process but also from the solution state in some cases, it can be realized in the next generation display device and lighting. Research is underway.
- the organic light emitting layer is composed of at least one organic and organometallic compound or an organic / inorganic hybrid material, and according to the light emitting mechanism, a fluorescent method due to the emission attenuation of the singlet excitons or a phosphorescent method using the emission attenuation of the triplet excitons. It can be divided into two.
- the most important key component of such a phosphorescent organic light emitting device is a phosphorescent material, and most organometallic compounds are well known, and among them, an organometallic compound mainly based on iridium occupies a large number.
- the optical and electrical properties of the final iridium organometallic compound can be controlled according to the chemical structure of the ligand that coordinates the iridium atom, thereby synthesizing the organometallic compound suitable for various requirements. There is an advantage to this.
- iridium organometallic compounds having phenylpyridine as the basic structure of the ligand for example tris (2-phenylpyridine) iridium (III) (hereinafter Ir (ppy) 3 ), are well known (see JP 3992929).
- the present inventors while conducting research to solve the above problems, introduces a germanium substituent to the iridium ligand to synthesize a novel organometallic compound with improved luminous efficiency by inhibiting the interaction of molecules, such a compound in the solution phase
- the present invention was completed by confirming that it can be dissolved well and use a solution process, and the luminescence property is improved to be equal to or higher than that of a conventional organometallic compound and can be usefully used in an organic light emitting device.
- Another object of the present invention to provide an organic light emitting device comprising the novel organometallic compound.
- the present invention provides a novel organometallic compound represented by the following formula (1).
- the present invention also provides an organic light emitting device comprising the novel organometallic compound.
- step 1 Dissolving the novel organometallic compound in an organic solvent to prepare a solution (step 1);
- step 2 After dropping the solution of the step 1 on the substrate and rotating the substrate, it provides a method for forming a thin film for an organic light emitting device comprising the step of drying to form a thin film on the substrate (step 2).
- the intermolecular interaction in the solid state is suppressed by introducing germanium substituents into the iridium organometallic compound matrix, which can be usefully used in the solution process, and the luminous efficiency when used as part of the light emitting layer of the organic light emitting device. Since this is remarkably improved, it can be usefully used as a material for an organic light emitting device.
- FIG. 1 to 3 are schematic cross-sectional views of organic light emitting diodes according to the present invention, respectively.
- Example 5 is a graph showing current density-luminescence efficiency of organic light emitting diodes manufactured in Examples 4, 5, and Comparative Example 1 of the present invention.
- Example 6 is a voltage-brightness / voltage-current graph of the organic light emitting diodes manufactured in Examples 4, 5 and Comparative Example 1 of the present invention.
- Example 7 is a current density-luminescence efficiency graph of the multilayer organic light emitting device manufactured in Example 6 of the present invention.
- Example 8 is a voltage-brightness / voltage-current graph of the multilayer organic light emitting device manufactured in Example 6 of the present invention.
- the organometallic compound according to the present invention is characterized by represented by the following formula (1):
- At least one of R 1 to R 4 is a substituent represented by the following formula (2);
- R 1 to R 4 is not a substituent of Formula 2, independently of one another hydrogen, deuterium, halogen, cyano, C 1 -C 18 straight or branched chain alkyl, C 1 -C 18 straight or branched chain alkoxy, C 6 ⁇ C 18 aryl, C 3 -C 18 cycloalkyl, C 4 -C 18 heteroaryl or 5- to 6-membered heterocycloalkyl, wherein the alkyl or alkoxy is unsubstituted or substituted with halogen and the aryl, cyclo Alkyl, heteroaryl or heterocycloalkyl is unsubstituted or substituted with halogen or C 1 -C 18 straight or branched alkyl, said heteroaryl or heterocycloalkyl comprises at least one atom selected from N, O and S in the ring and;
- R 5 to R 8 are independently of each other hydrogen, deuterium, halogen, cyano, C 1 -C 18 straight or branched chain alkyl, C 1 -C 18 straight or branched chain alkoxy, C 6 -C 18 aryl, C 3 -C 18 Cycloalkyl, C 4 -C 18 heteroaryl or 5- to 6-membered heterocycloalkyl, wherein the alkyl or alkoxy is unsubstituted or substituted with halogen and the aryl, cycloalkyl, heteroaryl or heterocycloalkyl is Unsubstituted or substituted with halogen or C 1 -C 18 straight or branched alkyl, wherein said heteroaryl or heterocycloalkyl comprises one or more atoms selected from N, O and S in the ring;
- n 2 or 3.
- L 1 to L 3 are independently of each other hydrogen, deuterium, halogen, cyano, C 1 -C 18 straight or branched alkyl, C 1 -C 18 straight or branched alkoxy, C 6 -C 18 aryl, C 3 -C 18 Cycloalkyl, C 4 -C 18 heteroaryl or 5- to 6-membered heterocycloalkyl, wherein the alkyl or alkoxy is unsubstituted or substituted with halogen and the aryl, cycloalkyl, heteroaryl or heterocycloalkyl is Unsubstituted or substituted with halogen or C 1 -C 18 straight or branched alkyl, wherein said heteroaryl or heterocycloalkyl comprises one or more atoms selected from N, O and S in the ring).
- the organometallic compound according to the present invention is characterized in that the compound represented by the formula (1A).
- L 1 to L 3 is independently from each other is characterized in that methyl, ethyl, propyl, isopropyl, cyclohexyl, phenyl.
- R 5 to R 8 are independently of each other hydrogen, methyl, phenyl, methylphenyl. It is characterized by being dimethylphenyl.
- a and B are each independently one selected from the group consisting of N (nitrogen), O (oxygen), S (sulfur), P (phosphorus) and C (carbon).
- the bidentate ligand represented by is characterized in that it is selected from the group consisting of compounds of the following formula.
- organometallic compound according to Chemical Formula 1 include Ir (PhGe-ppy) 3 , Ir (MeGe-ppy) 3 , and Ir (MeGe-ppy) 2 (acac), but are not limited thereto. Do not.
- the present invention also provides a method for producing the novel organometallic compound.
- step 2 The compound of formula 6 and the iridium complex compound prepared in step 1 is mixed with glycerol to reflux to prepare an organometallic compound of formula 1a coordinated with the three saccharide compounds of formula (6) (step 2).
- Step 1 is a step of preparing a phenylpyridine compound substituted with a germanium substituent of Formula 4 by reacting a phenylpyridine compound of Formula 2 with a germanium containing compound of Formula 3 and a lithium salt.
- the germanium substituent of Chemical Formula 4 is substituted by adding the compound of Chemical Formula 2 to an organic solvent such as tetrahydrofuran (THF), diethan ether (diethyl ether), and adding a germanium-containing compound of Chemical Formula 3 and a lithium salt to react.
- organic solvent such as tetrahydrofuran (THF), diethan ether (diethyl ether), and adding a germanium-containing compound of Chemical Formula 3 and a lithium salt to react.
- Phenylpyridine compound can be prepared.
- the compound of formula (2) and the compound of formula (3) that is a starting material may be purchased by commercially available, or may be prepared by a manufacturing method commonly used in the art.
- n-BuLi, sec-BuLi, tert-BuLi, or the like may be used, and preferably n-BuLi may be used.
- the reaction is preferably carried out at a low temperature of -75 ⁇ -80 °C, after the reaction is completed may be further performed to perform a column chromatography to purify the product.
- step 2 is a step of preparing the organometallic compound of Formula 1a in which the compound of Formula 6 prepared in Step 1 and the iridium complex compound are mixed and refluxed to coordinate the three zuligand compounds of Formula 6.
- the compound of Formula 6 and the iridium complex compound is mixed with glycerol at a ratio of 2 to 3: 1 mol, stirred at reflux for 23 to 27 hours, cooled to room temperature, and then added with acid to add
- An organometallic compound of Formula 1a may be prepared in which a ligand compound of 6 is coordinated. Thereafter, the extraction of the organic solvent and column chromatography may be performed to further purify the product.
- step A Reacting a phenylpyridine compound of formula 4 with a germanium containing compound of formula 5 and a lithium salt to prepare a phenylpyridine compound substituted with a germanium substituent of formula 6 (step A);
- Step B Preparing a diiridium dimer of Chemical Formula 7 by mixing the compound of Chemical Formula 6 prepared in Step A with iridium trichloride (IrCl 3 ) and a solvent and reacting at reflux (step B); And
- step C The diiridium dimer compound and the secondary ligand compound of formula 7 prepared in step B ( -H) is added to an organic solvent and a coupling reaction is carried out to produce a compound of Formula 1b (step C).
- step A is a step of preparing a phenylpyridine compound substituted with a germanium substituent of Formula 6, it may be carried out in the same manner as step 1 of Scheme 1.
- step B is a step of preparing a diiridium dimer of formula (7) by mixing the compound of formula (6) prepared in step A with iridium trichloride (IrCl 3 ) and a solvent and reacting at reflux temperature.
- iridium trichloride IrCl 3
- iridium trichloride (IrCl 3 ) and the compound of formula (6), which is a ligand, are mixed in a solvent at a ratio of 1: 2 to 3 mol to reflux, and then diiridium dimer is separated.
- the solvent in the above step is preferably an alcohol or an alcohol / water mixed solvent, and examples thereof include 2-ethoxyethanol and 2-ethoxyethanol / water mixed solvent.
- step C is a diiridium dimer compound and the secondary ligand compound of Formula 7 prepared in step B ( -H) is a step of preparing a compound of Formula 1b by coupling into an organic solvent.
- the separated diiridium dimer is a secondary ligand compound ( -H) is mixed together with an organic solvent and heated to prepare an organometallic compound having a ligand: auxiliary ligand of 2: 1 as a final product.
- the main and secondary ligands of the final product are appropriately determined and used according to the composition ratio, wherein AgCF 3 SO 3 , Na 2 CO 3 , NaOH and the like are used as organic solvents 2-ethoxyethanol, 2-methoxy
- the mixture can be reacted with ethyl ether and 1,2-dichloroethane.
- the organometallic compound of Formula 1 according to the present invention includes at least one germanium substituent of Formula 2, thereby inhibiting the interaction between the organometallic compound molecules in the solid phase as compared with the unsubstituted compound, thus the performance of the organic light emitting device, in particular the luminous efficiency. Can improve.
- the organometallic compound of Formula 1 according to the present invention includes at least one germanium substituent of Formula 2, thereby increasing the solubility in organic solvents compared to the unsubstituted compound. Accordingly, in producing an organic thin film containing the organometallic compound of Formula 1 from the solution phase, the concentration of the compound of Formula 1 in the solution may be increased.
- the organometallic compound of the formula (1) according to the present invention by introducing a germanium substituent to the iridium organometallic compound matrix can inhibit the intermolecular interaction in the solid state can be usefully used in the solution process, the light emitting layer of the organic light emitting device When used as a part, since the luminous efficiency is remarkably improved, it can be usefully used as a material for an organic light emitting device.
- the solution process may use a spin coating method, inkjet printing, screen printing, gravure printing, etc.
- the compound of Formula 1 according to the present invention may be applied to a general thin film forming method such as vacuum thermal deposition, dip coating.
- the present invention provides an organic light emitting device including the organometallic compound of Formula 1 in a light emitting layer.
- the organic light emitting device is a monolayer comprising a light emitting layer including the compound of Formula 1 as a light emitting host material as one structural unit between an anode, a cathode, and two electrodes, or an anode together with a charge transport layer. It has a multi-layered structure in which the light emitting layer and the cathode containing a compound of the light emitting material in order.
- the first electrode Second electrode; And at least one organic material layer interposed between the first electrode and the second electrode, wherein the organic material layer may include at least one organometallic compound represented by Chemical Formula 1.
- a multilayer device having a combination of a light emitting layer and a charge transporting layer exhibits superior characteristics, rather than a single layered device consisting of only one light emitting layer, which is an energy barrier when charge is injected from an electrode by properly combining the light emitting material and the charge transporting material. This is because the charge transport layer binds the holes or electrons injected from the electrode to the light emitting layer region to balance the number density of the holes and electrons injected.
- the basic organic light emitting device of the present invention has a structure in which a transparent electrode (anode), a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, and a metal electrode (cathode) are sequentially stacked.
- a hole blocking layer is provided between the light emitting layer and the electron transporting layer as shown in FIG. 2, or as shown in FIG. 3, or a hole blocking layer between the light emitting layer and the electron transporting layer and between the light emitting layer and the hole transporting layer, respectively.
- an electron blocking layer is provided between the light emitting layer and the electron transporting layer.
- the transparent electrode (anode) and the metal electrode (cathode) are conventional electrode materials, for example, the transparent electrode is indium tin oxide (ITO) or SnO 2 , and the metal electrode is It may be formed of a metal such as Li, Mg, Ca, Ag, Al and In or an alloy thereof, and the metal electrode may have a single layer or a multilayer structure of two or more layers.
- the transparent electrode is indium tin oxide (ITO) or SnO 2
- the metal electrode is It may be formed of a metal such as Li, Mg, Ca, Ag, Al and In or an alloy thereof, and the metal electrode may have a single layer or a multilayer structure of two or more layers.
- the compound of Chemical Formula 1 of the present invention may be used as a dopant material, and may have a single layer or a multilayer structure of two or more layers.
- the compound of Formula 1 may further include a phosphorescent dopant, the phosphorescent dopant is commonly used in the art, tris (2-phenylpyridinato-N, C2) ruthenium, bis (2-phenyl Pyridinato-N, C2) palladium, bis (2-phenylpyridinato-N, C2) platinum, tris (2-phenylpyridinato-N, C2) osmium, tris (2-phenylpyridinato-N , C2) rhenium, octaethyl platinum porphyrin, octaphenyl platinum porphyrin, octaethyl palladium porphyrin, octaphenyl palladium porphyrin, irid
- the hole transport layer is a conventional hole transport material such as 4,4-bis [N- (1-naphthyl) -N-phenyl-amine] biphenyl ( ⁇ -NPD), N, N-diphenyl-N, N-bis (3-methylphenyl) -1,1-biphenyl-4,4-diamine (TPD) and poly- (N-vinylcarbazole) (PVCz) may be included alone or in combination of two or more thereof. It can also be laminated
- the hole blocking layer has a lower un °C cupied molecular orbital (LUMO) value of 5.5 to 7.0 and a hole transport capacity is remarkably decreased, and the hole blocking layer is composed of a material having excellent electron transport ability, such as bassocuproin (Bath °C uproine). , BCP), 3- (4-biphenylyl) -4-phenyl-5- (4-t-butylphenyl) -1,2,4-triazole (TAZ) and bis (8-hydroxy-2- Methylquinolinato) -aluminum biphenoxide (BAlq) and the like are suitable.
- a material having a large LUMO value is generally used as the electron blocking layer, and iridium (III) tris (1-phenylpyrazole-N, C 2 ′) (Ir (ppz) 3 ) is suitable.
- the electron transporting layer may be composed of a conventional electron transporting material such as tris (8-quinolinolato) aluminum (Alq 3) or rubrene alone or in combination of two or more thereof. Two or more separate layers may be stacked.
- a conventional hole injection layer including, for example, copper phthalocyanine (CuPc) may be inserted between the anode and the hole transport layer, and the cathode and the electron transport layer may be inserted.
- a conventional electron injection layer containing LiF can be inserted.
- the anode, cathode, light emitting layer, transport layer, injection layer and blocking layer may be formed by a conventional deposition method.
- Step 1 Preparing a solution by dissolving the organometallic compound of Formula 1 in an organic solvent (step 1);
- step 2 After dropping the solution of the step 1 on the substrate and rotating the substrate, it provides a method for forming a thin film for an organic light emitting device comprising the step of drying to form a thin film on the substrate (step 2).
- the organometallic compound of Formula 1 according to the present invention includes at least one germanium substituent of Formula 2, thereby increasing the solubility in organic solvents as compared to the unsubstituted compound. Accordingly, in producing an organic thin film containing the organometallic compound of Formula 1 from the solution phase, the concentration of the compound of Formula 1 in the solution may be increased.
- 1,2-dichloroethane, chlorobenzene, toluene, etc. may be used as the organic solvent, but is not limited thereto.
- Step 1 Preparation of 3- (triphenyllow mille) -6-phenylpyridine
- 3-Bromo-6-phenylpyridine (0.86 g, 3.67 mmol) prepared in Preparation Example 1 was dissolved in anhydrous tetrahydrofuran (20 mL) and stirred at -78 ° C. Normal-butyllithium (1.76 mL, 4.41 mmol, 2.5 M hexane solution) was added dropwise to this solution over about 20 minutes. After stirring for an additional 1 hour, triphenylgermanium chloride (1.5 gm 4.41 mmol) was added and the reaction proceeded at room temperature overnight. Then water (100 mL) was added and the water and organic layers were separated.
- Steps B and C Ir (MeGe-ppy) 2 manufacture of (acac)
- step A 3- (trimethyllow density) -6-phenylpyridine (1.61 g, 5.91 mmol) and iridium (III) acetylacetonate (0.53 g, 1.77 mmol) prepared in step A were mixed with 2-ethoxyethanol (30 mL). Dissolved in water (10 mL) and stirred at 125 ° C for 12 h. After cooling to room temperature, excess water was added and the precipitate was filtered to give a cyclometalated Ir (III) ⁇ -chloro bridged dimer (0.60 g, yield 44%) (step B).
- step B In the dimer compound obtained in step B without further purification, acetylacetone (0.10 g, 1.00 mmol) and sodium carbonate (0.41 g, 3.9 mmol) were dissolved in 2-ethoxyethanol (10 mL) and heated to reflux at 170 ° C. for 12 hours. After the completion of the reaction, the solid formed while cooling to room temperature was filtered, washed with water, and the final product was purified by column chromatography on silica gel with dichloromethane as a developing solution to obtain the target compound (0.19 g, yield 30%) as a yellow solid.
- the patterned ITO substrate was ultrasonically cleaned with acetone and isopropanol for 10 minutes each, followed by drying with blowing nitrogen, followed by dry cleaning for 20 minutes in an ultraviolet-ozone cleaning apparatus.
- PEDOT: PSS (CLEVIOS TM P VP AI 4083) was spin-coated at 4200 rpm for 30 seconds on the cleaned ITO substrate, and dried at 120 ° C. in a vacuum oven for 1 hour to form a thin film of 40 nm.
- 50:10:31 of PVK Sigma-Aldrich Cat. No. 368350
- TPD Sigma-Aldrich Cat. No. 443263
- PBD Sigma-Aldrich Cat. No.
- Example 2 B8378 and Ir (PhGe-ppy) 3 synthesized in Example 1 It mixed at the ratio of: 9 (mass ratio), 1,2-dichloroethane was added so that total solid concentration might be 1.3 mass%, and the organic light emitting layer composition was prepared.
- the organic light emitting layer composition solution thus prepared was spin coated on the PEDOT: PSS coated ITO substrate at 1500 rpm for 30 seconds, and dried on a 55 ° C. hot plate to form a thin film of 80 nm. Spin coating and drying of the organic light emitting layer composition solution were all carried out in a glove box under a nitrogen atmosphere.
- the ITO substrate coated with PEDOT: PSS and the organic light emitting layer composition was transferred to a metal vacuum deposition chamber, and cesium fluoride and aluminum were vacuum-deposited 1 nm and 120 nm, respectively, under 10 -7 Torr vacuum.
- the organic light emitting device was encapsulated with a glass cover and an epoxy sealant in a glove box, and then the characteristics of the organic light emitting device were evaluated using a PR-650 spectra calorimeter and Keithley 2400 source measuring unit.
- An organic light emitting device was manufactured in the same manner as in Example 4, except that Ir (MeGe-ppy) 3 synthesized in Example 2 was used instead of Ir (PhGe-ppy) 3 as a component of the organic light emitting layer composition solution. And its properties were evaluated.
- the germanium-substituted Ir (PhGe-ppy) 3 and Ir (MeGe-ppy) 3 organic compounds of the organic light-emitting device As shown in FIGS. 4 to 6 and Table 1, compared to Ir (ppy) 3 as a comparative material, the germanium-substituted Ir (PhGe-ppy) 3 and Ir (MeGe-ppy) 3 organic compounds of the organic light-emitting device It was confirmed that the light emitting layer exhibited superior performance as the light emitting material, and it was confirmed that the emission efficiency of the organic light emitting device using the same was introduced by introducing germanium substituents into the organic light emitting material.
- the compound according to the present invention when used as part of the light emitting layer of the organic light emitting device, the light emission efficiency is remarkably improved, and thus, the compound according to the present invention may be usefully used as a material for an organic light emitting device.
- the poly (triphenylamine) solution (0.12 mass%, solvent: chlorobenzene) was spin-coated at 1500 rpm for 30 seconds, and then heated at 100 ° C. It was dried at to form a hole transport layer thin film of 10 nm. 73:10:10 of PVK (Sigma-Aldrich Cat. No. 368350), TPD (Sigma-Aldrich Cat. No. 443263), PBD (Sigma-Aldrich Cat. No.
- Example 2 B8378 and Ir (MeGe-ppy) 3 synthesized in Example 2 It mixed at the ratio of: 7 (mass ratio), and 1,2- dichloroethane was added so that total solid concentration might be 0.64 mass%, and the organic light emitting layer composition was prepared.
- the organic light emitting layer composition solution thus prepared was spin coated on the PEDOT: PSS and poly (triphenylamine) coated ITO substrate at 1800 rpm for 30 seconds, and dried on a 55 ° C. hot plate to form a 50 nm organic light emitting layer thin film. Spin coating and drying of the hole transport layer and the organic light emitting layer composition solution were all carried out in a glove box under a nitrogen atmosphere.
- the ITO substrate coated with the PEDOT: PSS, hole transporting layer and organic light emitting layer composition was transferred to a vacuum deposition chamber and TPBi (1,3,5-Tri (1-phenyl-1H-benzo [d] imidazol-) under 10 -7 Torr vacuum.
- 2-yl) phenyl and Lumtec Catalog No. LT-E302 were vacuum-evaporated to 57 nm to form an electron transport layer, and cesium fluoride and aluminum were then vacuum-deposited to 1 nm and 120 nm, respectively, under 10 -7 Torr vacuum.
- the organic light emitting device was encapsulated with a glass cover and an epoxy sealant in a glove box, and then the characteristics of the organic light emitting device were evaluated using a PR-650 spectra calorimeter and Keithley 2400 source measuring unit.
- the current density-luminescence efficiency graph of the organic light emitting diode of Example 6 was measured, and a voltage-brightness / voltage-current graph is shown in FIG. 8.
- the multilayer organic light emitting device manufactured by using the germanium-substituted Ir (MeGe-ppy) 3 showed excellent characteristics.
- germanium-substituted Ir (MeGe-ppy) 3 according to the present invention can be usefully used as an organic light emitting device.
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Abstract
Description
| 최대발광파장 (nm) | CIE 색좌표 (x,y) | 최대전류효율 (cd/A) | |
| 실시예 4 | 524 | (0.35, 0.61) | 20.9 |
| 실시예 5 | 520 | (0.33, 0.62) | 23.0 |
| 비교예 1 | 512 | (0.31, 0.61) | 17.0 |
Claims (11)
- 하기 화학식 1로 표시되는 유기금속 화합물:[화학식 1](상기 화학식 1에서,R1 내지 R4 중에서 적어도 하나는 하기 화학식 2로 표시되는 치환체이고;R1 내지 R4 중에서 하기 화학식 2의 치환체가 아닌 경우, 서로 독립적으로 수소, 중수소, 할로겐, 시아노, C1-C18 직쇄 또는 측쇄 알킬, C1-C18 직쇄 또는 측쇄 알콕시, C6-C18 아릴, C3-C18 시클로알킬, C4-C18 헤테로아릴 또는 5원 내지 6원의 헤테로시클로알킬이고, 이때, 상기 알킬 또는 알콕시는 비치환 또는 할로겐으로 치환되고, 상기 아릴, 시클로알킬, 헤테로아릴 또는 헤테로시클로알킬은 비치환 또는 할로겐 또는 C1-C18 직쇄 또는 측쇄 알킬로 치환되고, 상기 헤테로아릴 또는 헤테로시클로알킬은 고리 내 N, O 및 S로부터 선택되는 하나 이상의 원자를 포함하고;R5 내지 R8은 서로 독립적으로 수소, 중수소, 할로겐, 시아노, C1-C18 직쇄 또는 측쇄 알킬, C1-C18 직쇄 또는 측쇄 알콕시, C6-C18 아릴, C3-C18 시클로알킬, C4-C18 헤테로아릴 또는 5원 내지 6원의 헤테로시클로알킬이고, 이때, 상기 알킬 또는 알콕시는 비치환 또는 할로겐으로 치환되고, 상기 아릴, 시클로알킬, 헤테로아릴 또는 헤테로시클로알킬은 비치환 또는 할로겐 또는 C1-C18 직쇄 또는 측쇄 알킬로 치환되고, 상기 헤테로아릴 또는 헤테로시클로알킬은 고리 내 N, O 및 S로부터 선택되는 하나 이상의 원자를 포함하고;m은 2 또는 3이다).[화학식 2](상기 화학식 2에서,L1 내지 L3는 서로 독립적으로 수소, 중수소, 할로겐, 시아노, C1-C18 직쇄 또는 측쇄 알킬, C1-C18 직쇄 또는 측쇄 알콕시, C6-C18 아릴, C3-C18 시클로알킬, C4-C18 헤테로아릴 또는 5원 내지 6원의 헤테로시클로알킬이고, 이때, 상기 알킬 또는 알콕시는 비치환 또는 할로겐으로 치환되고, 상기 아릴, 시클로알킬, 헤테로아릴 또는 헤테로시클로알킬은 비치환 또는 할로겐 또는 C1-C18 직쇄 또는 측쇄 알킬로 치환되고, 상기 헤테로아릴 또는 헤테로시클로알킬은 고리 내 N, O 및 S로부터 선택되는 하나 이상의 원자를 포함한다).
- 제2항에 있어서, 상기 L1 내지 L3는 서로 독립적으로 메틸, 에틸, 프로필, 이소프로필, 시클로헥실, 페닐인 것을 특징으로 하는 유기금속 화합물.
- 제1항 또는 제2항에 있어서, 상기 R5 내지 R8는 서로 독립적으로 수소, 메틸, 페닐, 메틸페닐. 디메틸페닐인 것을 특징으로 하는 유기금속 화합물.
- 제1항 또는 제2항에 있어서, 상기 A 및 B는 각각 독립적으로 N(질소), O(산소), S(황), P(인) 및 C(탄소)로 이루어지는 군으로부터 선택되는 1종인 것을 특징으로 하는 유기금속 화합물.
- 제1항 또는 제2항의 유기금속 화합물을 포함하는 유기 발광 소자.
- 제8항에 있어서, 상기 유기금속 화합물은 발광층의 도판트 물질로 사용되는 것을 특징으로 하는 유기 발광 소자.
- 제1전극;제2전극; 및상기 제1전극 및 제2전극 사이에 개재되는 1층 이상의 유기물층으로 이루어진 유기 발광 소자에 있어서,상기 유기물층은 제1항 또는 제2항의 유기금속 화합물을 하나 이상 포함하는 것을 특징으로 하는 유기 발광 소자.
- 제1항 또는 제2항의 유기금속 화합물을 유기용매에 용해시켜 용액을 제조하는 단계(단계 1); 및상기 단계 1의 용액을 기판 위에 떨어뜨리고 기판을 회전시킨 후, 건조하여 기판상에 박막을 형성시키는 단계(단계 2)를 포함하는 유기 발광 소자용 박막 형성 방법.
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| KR102860028B1 (ko) * | 2021-11-15 | 2025-09-12 | 삼성전자주식회사 | 유기금속 화합물, 이를 포함한 발광 소자 및 상기 발광 소자를 포함한 전자 장치 |
| US12509628B2 (en) | 2021-12-16 | 2025-12-30 | Universal Display Corporation | Organic electroluminescent materials and devices |
| EP4231804A3 (en) | 2022-02-16 | 2023-09-20 | Universal Display Corporation | Organic electroluminescent materials and devices |
| US20230292592A1 (en) | 2022-03-09 | 2023-09-14 | Universal Display Corporation | Organic electroluminescent materials and devices |
| KR102845986B1 (ko) * | 2022-03-23 | 2025-08-13 | 삼성전자주식회사 | 유기금속 화합물, 이를 포함한 발광 소자 및 상기 발광 소자를 포함한 전자 장치 |
| US20230337516A1 (en) | 2022-04-18 | 2023-10-19 | Universal Display Corporation | Organic electroluminescent materials and devices |
| US20230389421A1 (en) | 2022-05-24 | 2023-11-30 | Universal Display Corporation | Organic electroluminescent materials and devices |
| EP4293001A1 (en) | 2022-06-08 | 2023-12-20 | Universal Display Corporation | Organic electroluminescent materials and devices |
| US20240016051A1 (en) | 2022-06-28 | 2024-01-11 | Universal Display Corporation | Organic electroluminescent materials and devices |
| US20240107880A1 (en) | 2022-08-17 | 2024-03-28 | Universal Display Corporation | Organic electroluminescent materials and devices |
| US20240188419A1 (en) | 2022-10-27 | 2024-06-06 | Universal Display Corporation | Organic electroluminescent materials and devices |
| US20240196730A1 (en) | 2022-10-27 | 2024-06-13 | Universal Display Corporation | Organic electroluminescent materials and devices |
| US20240188319A1 (en) | 2022-10-27 | 2024-06-06 | Universal Display Corporation | Organic electroluminescent materials and devices |
| US20240180025A1 (en) | 2022-10-27 | 2024-05-30 | Universal Display Corporation | Organic electroluminescent materials and devices |
| US20240188316A1 (en) | 2022-10-27 | 2024-06-06 | Universal Display Corporation | Organic electroluminescent materials and devices |
| US20240247017A1 (en) | 2022-12-14 | 2024-07-25 | Universal Display Corporation | Organic electroluminescent materials and devices |
| US20250204239A1 (en) | 2023-12-15 | 2025-06-19 | Universal Display Corporation | Organic electroluminescent materials and devices |
| US20250204238A1 (en) | 2023-12-15 | 2025-06-19 | Universal Display Corporation | Organic electroluminscent materials and devices |
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| US6303238B1 (en) | 1997-12-01 | 2001-10-16 | The Trustees Of Princeton University | OLEDs doped with phosphorescent compounds |
| EP1729327B2 (en) | 1999-05-13 | 2022-08-10 | The Trustees Of Princeton University | Use of a phosphorescent iridium compound as emissive molecule in an organic light emitting device |
| JP2002008860A (ja) * | 2000-04-18 | 2002-01-11 | Mitsubishi Chemicals Corp | 有機電界発光素子 |
| KR101074418B1 (ko) * | 2004-02-09 | 2011-10-17 | 엘지디스플레이 주식회사 | Oled 제조용 인광 발광 물질 및 이를 포함하는 oled |
| TWI398188B (zh) * | 2004-08-31 | 2013-06-01 | 昭和電工股份有限公司 | A luminous body, and a lighting and display device using the luminous body |
| KR100880220B1 (ko) * | 2004-10-04 | 2009-01-28 | 엘지디스플레이 주식회사 | 유기 실리콘을 갖는 페닐 피리딘기를 포함하는 이리듐화합물계 발광 화합물 및 이를 발색 재료로서 사용하는유기전계발광소자 |
| JP5043329B2 (ja) * | 2005-12-13 | 2012-10-10 | 昭和電工株式会社 | 高分子発光材料、有機エレクトロルミネッセンス素子および表示装置 |
| JP5043332B2 (ja) * | 2005-12-15 | 2012-10-10 | 昭和電工株式会社 | 高分子発光材料、有機エレクトロルミネッセンス素子および表示装置 |
| WO2008153088A1 (ja) * | 2007-06-13 | 2008-12-18 | Ube Industries, Ltd. | 有機エレクトロルミネッセンス素子及び素子用材料 |
| JP2010070488A (ja) * | 2008-09-18 | 2010-04-02 | Sumitomo Chemical Co Ltd | 遷移金属錯体、遷移金属錯体結合ポリマー及びその製造方法 |
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| US20130334521A1 (en) | 2013-12-19 |
| US9478756B2 (en) | 2016-10-25 |
| WO2012138172A3 (ko) | 2013-01-10 |
| JP5655165B2 (ja) | 2015-01-14 |
| KR101298735B1 (ko) | 2013-08-21 |
| KR20120114030A (ko) | 2012-10-16 |
| JP2014509587A (ja) | 2014-04-21 |
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