KR101219668B1 - Phosphorescent blue-emitting iridium complex organic electroluminescent device comprising same - Google Patents
Phosphorescent blue-emitting iridium complex organic electroluminescent device comprising same Download PDFInfo
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- 229910052741 iridium Inorganic materials 0.000 title claims abstract description 28
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 150000001875 compounds Chemical class 0.000 claims description 17
- 125000004432 carbon atom Chemical group C* 0.000 claims description 12
- 125000003118 aryl group Chemical group 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- 239000001257 hydrogen Substances 0.000 claims description 7
- 125000001072 heteroaryl group Chemical group 0.000 claims description 6
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 5
- 230000005525 hole transport Effects 0.000 claims description 5
- 125000003545 alkoxy group Chemical group 0.000 claims description 3
- 125000000217 alkyl group Chemical group 0.000 claims description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 3
- 125000004093 cyano group Chemical group *C#N 0.000 claims description 3
- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 150000002367 halogens Chemical class 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 claims description 3
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims description 3
- 239000002019 doping agent Substances 0.000 claims description 2
- 125000005842 heteroatom Chemical group 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 12
- 239000000126 substance Substances 0.000 abstract description 3
- 229920000642 polymer Polymers 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 239000003446 ligand Substances 0.000 description 10
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 9
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 8
- 239000002244 precipitate Substances 0.000 description 8
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 6
- 229940093475 2-ethoxyethanol Drugs 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000007810 chemical reaction solvent Substances 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 239000011541 reaction mixture Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 150000002503 iridium Chemical class 0.000 description 4
- 125000001424 substituent group Chemical group 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000004587 chromatography analysis Methods 0.000 description 3
- 239000000539 dimer Substances 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- FKNQCJSGGFJEIZ-UHFFFAOYSA-N 4-methylpyridine Chemical compound CC1=CC=NC=C1 FKNQCJSGGFJEIZ-UHFFFAOYSA-N 0.000 description 2
- MZYDBGLUVPLRKR-UHFFFAOYSA-N 9-(3-carbazol-9-ylphenyl)carbazole Chemical compound C12=CC=CC=C2C2=CC=CC=C2N1C1=CC(N2C3=CC=CC=C3C3=CC=CC=C32)=CC=C1 MZYDBGLUVPLRKR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 229960004132 diethyl ether Drugs 0.000 description 2
- 230000005283 ground state Effects 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000004020 luminiscence type Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000012046 mixed solvent Substances 0.000 description 2
- SIOXPEMLGUPBBT-UHFFFAOYSA-N picolinic acid Chemical compound OC(=O)C1=CC=CC=N1 SIOXPEMLGUPBBT-UHFFFAOYSA-N 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- FEKWWZCCJDUWLY-UHFFFAOYSA-N 3-methyl-1h-pyrrole Chemical compound CC=1C=CNC=1 FEKWWZCCJDUWLY-UHFFFAOYSA-N 0.000 description 1
- 125000001255 4-fluorophenyl group Chemical group [H]C1=C([H])C(*)=C([H])C([H])=C1F 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- VZJPWFTUVFCZHV-UHFFFAOYSA-N cyclohexene;pyridine Chemical group C1CCC=CC1.C1=CC=NC=C1 VZJPWFTUVFCZHV-UHFFFAOYSA-N 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- RHZWSUVWRRXEJF-UHFFFAOYSA-N indium tin Chemical compound [In].[Sn] RHZWSUVWRRXEJF-UHFFFAOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 150000002902 organometallic compounds Chemical class 0.000 description 1
- 229940081066 picolinic acid Drugs 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/30—Coordination compounds
- H10K85/341—Transition metal complexes, e.g. Ru(II)polypyridine complexes
- H10K85/342—Transition metal complexes, e.g. Ru(II)polypyridine complexes comprising iridium
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F15/00—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table
- C07F15/0006—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table compounds of the platinum group
- C07F15/0033—Iridium compounds
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
본 발명은 청색 인광 이리듐 착화합물 및 이를 포함하는 유기전기발광소자에 관한 것으로, 더욱 상세하게는 종래 이리듐 유기착화합물의 발광효율, 색 순도 및 전기적 안정성의 문제를 해결하기 위하여, 하기 화학식 1 및 화학식 2의 부분구조를 갖는 이리듐 착체로부터 도출되는 구조단위를 포함하므로써, 인광재료로 우수한 색순도 구현과 발광효율이 우수하여 유기전기발광소자의 발광물질로 유용하게 활용될 수 있는 중합체에 관한 것이다.
[화학식 1] [화학식 2]
The present invention relates to a blue phosphorescent iridium complex and an organic electroluminescent device comprising the same, and more particularly, to solve the problems of luminous efficiency, color purity and electrical stability of the conventional iridium organic complex, By including a structural unit derived from an iridium complex having a partial structure, the present invention relates to a polymer that can be usefully used as a light emitting material of an organic electroluminescent device because of excellent color purity and excellent luminous efficiency as a phosphorescent material.
[Chemical Formula 1] < EMI ID =
Description
본 발명은 종래 발광효율, 색 순도 및 전기적 안정성 등에 많은 문제를 갖고 있는 이리듐 유기착화합물의 기능을 개선한 청색 인광 이리듐 유기착화합물 및 이를 포함하는 유기전기발광소자에 관한 것이다.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blue phosphorescent iridium organic complex having an improved function of an iridium organic complex having many problems, such as luminous efficiency, color purity and electrical stability, and an organic electroluminescent device including the same.
정보화 사회로의 움직임이 가속화되면서 평판 디스플레이의 비중이 점차 증가하고 있다. 그 중 LCD(liquid crystal display)가 현재 가장 많이 쓰이고 있지만 액정에 전압을 가해 백라이트로부터의 빛을 컬러필터로 통과시켜 삼원색을 얻음으로써 화면을 만드는 방식이며, 유기EL(OLED; Organic Light Emitting Diodes)은 자체발광 소자로써 시야각 및 대조비 등이 우수하고, 경량 및 박형이 가능하며 휘는 성질의 기판에도 사용할 수 있어, 투명, 플렉서블 디스플레이가 가능하여 차세대 표시소자로서 주목을 받고 있다.As the movement to the information society accelerates, the proportion of flat panel displays is gradually increasing. Among them, liquid crystal display (LCD) is the most widely used, but it is a method of making a screen by applying voltage to the liquid crystal and passing the light from the backlight through a color filter to obtain three primary colors. As a self-luminous device, it has excellent viewing angle, contrast ratio, etc., is light and thin, and can be used for flexible substrates.
유기EL은 유기물 박막에 음극과 양극을 통하여 주입된 전자와 정공이 재결합을 통해 여기자(extion)를 형성하고, 형성된 그 여기자로부터 특정한 파장의 빛이 발생하는 현상으로 1963년 Pope 등에 의해 안트라센(anthracene)의 단결정으로부터 처음으로 발견되었고 이후 프린스턴 대학과 남 캘리포니아대학의 그룹이 인광 물질을 개발하였다.Organic EL is an phenomenon in which electrons and holes injected through a cathode and an anode are formed into an organic thin film by recombination, and light of a specific wavelength is generated from the formed excitons. Anthracene was produced by Pope et al. In 1963. It was first discovered from the single crystals of the group and later developed by a group at Princeton and the University of Southern California.
화합물 내 전자의 여기 상태는 일중항 대 삼중항의 비율이 1 : 3으로 삼중항 상태가 3배 정도 더 생성된다. 따라서, 일중항 상태에서 기저상태로 떨어지는 형광의 내부양자효율이 25%에 그치는 반면 삼중항 상태에서 기저상태로 떨어지는 인광의 내부양자효율은 75%이다. 또한 일중항 상태에서 삼중항 상태로 계간전이가 일어날 경우 내부양자효율의 이론적 한계치는 100%에 달한다. 이러한 점을 이용해 발광효율을 개선한 발광재료가 인광 발광재료이다.
The excited state of the former in the compound is 1: 3 of the singlet to triplet ratio, and about 3 times more triplet states are generated. Therefore, the internal quantum efficiency of fluorescence falling from the singlet state to the ground state is only 25%, while the internal quantum efficiency of phosphorescence falling from the triplet state to the ground state is 75%. In addition, the theoretical limit of the internal quantum efficiency reaches 100% in the case of a quarterly transition from singlet to triplet. Phosphorescent light emitting material is a light emitting material that improved the luminous efficiency by using this point.
인광 발광이 용이한 분자구조로는 계간전이가 용이한 분자 구조로 원자번호가 큰 전이금속이 중심원자로 있는 유기금속화합물이 바람직하며 그 중에서도 이리듐 유기착화합물이 각광받고 있으며, 이와 관련하여, 대한민국등록특허 10-0851519(등록일자 2008년08월05일)의 '발광 특성이 개선된 이리듐계 착화합물 및 이를 포함하는유기전계발광소자', 대한민국등록특허 10-0522784(등록일자 2005년10월12일)의 '고효율 적색 발광 재료 및 이를 도판트로서 채용하고 있는표시 소자', 대한민국등록특허 10-0705982(등록일자 2007년04월04일)의 '청색 발광 화합물 및 이를 발광재료로서 채용하고 있는 표시소자'를 개신한 바 있으나, 상기 제시한 등록특허를 포함한 종래 기술에서는 이리듐 유기착화합물의 발광효율, 색 순도 및 전기적 안정성 등에 많은 문제점이 있어 이에 대한 개선이 시급한 실정이다.
As the molecular structure for easy phosphorescence emission, an organometallic compound in which a transition metal having a large atomic number is a central atom is preferable, and among these, an iridium organic complex compound is in the spotlight. In this regard, the Republic of Korea Patent 10-0851519 (Registration date August 05, 2008) of 'Iridium complex compound with improved luminescence properties and organic light emitting device comprising the same', Republic of Korea Patent Registration 10-0522784 (Registration date October 12, 2005) 'High Efficiency Red Light Emitting Material and Display Device Employing It as Dopant', 'Blue Light Emitting Compound and Display Device Employing It as Light Emitting Material' of Korean Patent No. 10-0705982 (Dec. 04, 2007) Although it has been disclosed, there are many problems in the prior art including the above-mentioned patents, such as luminous efficiency, color purity and electrical stability of the iridium organic complex compound. Improved the situation is urgent.
상기 문제점을 해결하기 위해, 본 발명은 전기적 안정성 및 발광효율이 우수하며, 고휘도 발광 및 높은 색 순도 구현이 가능한 청색 인광 이리듐 유기착화합물 및 이를 포함하는 유기전기발광소자를 제공하고자 하는 것을 발명의 목적으로 한다.
In order to solve the above problems, the present invention is to provide a blue phosphorescent iridium organic complex compound which is excellent in electrical stability and luminous efficiency, high luminance and high color purity and an organic electroluminescent device comprising the same do.
상기 목적을 달성하기 위해, 본 발명은 하기 화학식 1의 청색 인광 이리듐 유기착화합물과 화학식 2의 청색 인광 이리듐 유기착화합물을 발명의 주요 기술적 구성으로 한다.
In order to achieve the above object, the present invention has a blue phosphorescent iridium organic complex of formula (1) and a blue phosphorescent iridium organic complex of formula (2) as the main technical configuration of the invention.
상기 화학식 1에서,In Formula 1,
R1, R2, R3, R4, R5는 각각 독립적으로 수소, 할로겐, 카복실, 아미노, 시아노, 니트로, C1-6의 직쇄형 또는 분지형의 알킬 또는 알콕시, C6-18의 치환되거나 비치환된 아릴이며, n은 2이상 m은 0이상의 정수이며 그 합은 3이다.R 1 , R 2 , R 3 , R 4 , R 5 are each independently hydrogen, halogen, carboxyl, amino, cyano, nitro, C 1-6 straight or branched alkyl or alkoxy, C 6-18 Is a substituted or unsubstituted aryl, n is at least 2 and m is an integer of at least 0 and the sum is 3.
L은 치환 또는 비치환된 탄소수 6 내지 30의 아릴기 또는 치환 또는 비치환된 탄소수 2 내지 30의 헤테로아릴기이다.
L is a substituted or unsubstituted aryl group having 6 to 30 carbon atoms or a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms.
상기 화학식 2에서 X1, X2, X3, X4는 각각 독립적으로 수소, 할로겐, 카복실, 아미노, 시아노, 니트로 C1-6의 직쇄형 또는 분자형의 알킬 또는 알콕시, C6-18의 치환되거나 비치환된 아릴 또는 C4-6의 헤테로 고리이거나, 서로 융화하여 융합고리 또는 다중융합고리이다. n은 2이상, m은 0이상의 정수이며 그 합은 3이다.X 1 , X 2 , X 3 , X 4 in Formula 2 are each independently hydrogen, halogen, carboxyl, amino, cyano, nitro C 1-6 linear or molecular alkyl or alkoxy, C 6-18 Or a substituted or unsubstituted aryl or a C 4-6 hetero ring, or a fused ring or a multifused ring in combination with each other. n is an integer of 2 or more, m is an integer of 0 or more, and the sum is 3.
L은 치환 또는 비치환된 탄소수 6 내지 30의 아릴기 또는 치환 또는 비치환된 탄소수 2 내지 30의 헤테로아릴기이다.
L is a substituted or unsubstituted aryl group having 6 to 30 carbon atoms or a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms.
상기 청색 인광 이리듐 유기착화합물의 제조는 다음의 과정을 거쳐 이루어진다.Preparation of the blue phosphorescent iridium organic complex is carried out through the following process.
이리듐에 2개의 리간드를 붙이는 합성으로 IrCl3·nH2O에 리간드를 2.5 ~ 3당량과, 물과 2-ethoxyethanol을 3:1부피비로 혼합하여 조성된 용매를 IrCl3·nH2O g당 50 ~ 60㎖를 넣고 4시간 이상 질소하에서 환류한다.Synthesis of two ligands on iridium was performed by mixing 2.5 to 3 equivalents of the ligand with IrCl 3 · nH 2 O, and water and 2-ethoxyethanol in a 3: 1 volume ratio to 50 solvents per g of IrCl 3 · nH 2 O. Add ~ 60ml and reflux under nitrogen for at least 4 hours.
반응 혼합물을 냉각시킨 후 물을 반응용매량 만큼 첨가하여 침전물을 수득하고, 침전물은 물(반응용매량과 동일한 양으로 3 ~ 5회)과 메탄올(반응 용매량과 동일한 양으로 2 ~ 3회)로 충분히 세척한 후 건조하여 다이머를 수득한다.
After cooling the reaction mixture, water was added as much as the amount of reaction solvent to obtain a precipitate, and the precipitate was water (3 to 5 times the same amount as the reaction solvent) and methanol (2 to 3 times the same amount as the reaction solvent). After washing sufficiently with dryness to obtain a dimer.
그리고 최종 종결 반응으로서, 상기 합성한 다이머에 결합하고자 하는 리간드 2 ~ 3당량과, 다이머 g당 15 ~ 20㎖의 2-ethoxyethanol 및 베이즈(Na2CO3) 10당량을 넣고 질소 분위기 하에서 12시간 이상 환류시킨다.As a final termination reaction, 2 to 3 equivalents of the ligand to be bound to the synthesized dimer, and 15 to 20 ml of 2-ethoxyethanol and 10 equivalents of Bayes (Na 2 CO 3 ) per g of the dimer were added thereto for 12 hours under a nitrogen atmosphere. It is refluxed more than.
다음으로, 합성혼합물을 냉각시킨 후 물을 반응 용매량 만큼 첨가하여 침전물을 여과하고, 반응 용매량 만큼의 물로 여러 번 교반 세척한 다음, 다시 헥산과 에테르로 세척해 준 후 dichloromethane에 완전히 녹인 후 silica chromatography을 수행한 여과액을 재결정 정제하여 화합물을 얻는다.
Next, after cooling the synthetic mixture, the water is added as much as the amount of the reaction solvent, and the precipitate is filtered. The precipitate is filtered and washed several times with the amount of the reaction solvent, and then washed with hexane and ether again, and then completely dissolved in dichloromethane, and then silica. The filtrate subjected to chromatography is recrystallized and purified to obtain a compound.
상기 화학식 1에서 나타낸 바와 같이 이리듐(3가) 유기착화합물의 리간드 두 개는 주요부가 1사이클로헥센 피리딘과 수소 및 그 치환체 구조로 구성되며, 나머지 하나의 주요 보조 리간드는 주요 리간드와 같거나 치환 또는 비치환된 탄소수 6 내지 30의 아릴기 또는 치환 또는 비치환된 탄소수 2 내지 30의 헤테로아릴기로 구성된다.As shown in Formula 1, the two ligands of the iridium (trivalent) organic complex are composed of monocyclohexene pyridine, hydrogen, and a substituent structure thereof, and the other main auxiliary ligand is the same as or substituted or unsubstituted. A aryl group having 6 to 30 ring carbon atoms or a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms.
상기 화학식 2는 주요 구성부가 피롤페닐과 수소 및 그 치환체로 구성되며 보조 리간드는 주요 리간드와 같거나 치환 또는 비치환된 탄소수 6 내지 30의 아릴기 또는 치환 또는 비치환된 탄소수 2 내지 30의 헤테로아릴기로 구성된다.Formula (2) is composed of a principal component pyrrolephenyl and hydrogen and its substituents and the auxiliary ligand is the same or substituted or unsubstituted aryl group of 6 to 30 carbon atoms or substituted or unsubstituted heteroaryl of 2 to 30 carbon atoms It is composed of groups.
일반적으로 이리듐 유기착화합물의 발광특성은 리간드에 의해 결정되고 그 특성을 발휘하기 위해서는 호스트 물질로부터 전하의 공급이 원활하여야 한다.
In general, the luminescence properties of the iridium organic complex compound are determined by the ligand, and in order to exhibit the properties, supply of charge from the host material should be smooth.
본 발명에서는 주요 리간드로 1사이클로헥센피리딘과 수소 및 치환체(화학식1)와 피롤페닐과 수소 및 그 치환체로 하며 보조 리간드는 주요 리간드와 같거나 치환 또는 비치환된 탄소수 6 내지 30의 아릴기 또는 치환 또는 비치환된 탄소수 2 내지 30의 헤테로아릴기로 도입함으로써 색 순도 및 발광효율을 향상시킨다.
In the present invention, as the main ligand, 1 cyclohexenepyridine, hydrogen, and a substituent (Formula 1), pyrrolephenyl, hydrogen, and a substituent thereof, the auxiliary ligand is the same or substituted or unsubstituted aryl group having 6 to 30 carbon atoms or substituted with the main ligand. Or by introducing an unsubstituted heteroaryl group having 2 to 30 carbon atoms to improve color purity and luminous efficiency.
상기 청색 인광 이리듐 유기착화합물의 대표적 예는 하기의 화학식 1a, 2a에 나타내었다.
Representative examples of the blue phosphorescent iridium organic complex compounds are shown in the following Chemical Formulas 1a and 2a.
[화학식 1a][Formula 1a]
[화학식 2a][Formula 2a]
그리고 본 발명은 상기 청색 인광 이리듐 유기착화합물을 발광물질로 하는 발광층을 포함하여 유기전기발광소자를 이루게 되는 것으로, 상기 유기전기발광소자는 상기 화학식 1, 2의 청색 인광 이리듐 유기착화합물을 발광물질로 포함하는 발광층, 전하(전자, 정공) 주입, 전하(전자, 정공) 수송층과 함께 음극, 양극을 포함하여 도 1에 도시된 바와 같은 다층형 구조를 갖는다.
The present invention provides an organic electroluminescent device including a light emitting layer using the blue phosphorescent iridium organic complex as a light emitting material, and the organic electroluminescent device includes the blue phosphorescent iridium organic complex of Formulas 1 and 2 as a light emitting material. In addition to the light emitting layer, the charge (electron, hole) injection, the charge (electron, hole) transport layer, and has a multilayer structure as shown in FIG.
상기 유기전기발광소자의 양극(투명전극) 또는 음극(금속전극) 성분은, 양극의 경우 인듐주석화합물 또는 주석산화물이고, 음극의 경우 알루미늄, 리튬, 마그네슘, 칼슘 중 선택되는 어느 1종 또는 2종 이상의 금속 또는 이들의 합금으로 각각 이루어진다.The positive electrode (transparent electrode) or negative electrode (metal electrode) component of the organic electroluminescent device is an indium tin compound or tin oxide in the case of a positive electrode, and any one or two kinds selected from aluminum, lithium, magnesium, and calcium in the case of a negative electrode. It consists of the above metals or their alloys, respectively.
또한, 상기 발광층은 공지의 화합물인 하기 화학식 3의 1,3-다이-9-카바졸릴벤젠(MCP)를 호스트로 하여 여기에 화학식 1, 2의 화합물을 도핑시켜 포함할 수도 있다.
In addition, the light emitting layer may be included by doping the compound of Formula 1, 2 to a known compound 1,3-di-9-carbazolylbenzene (MCP) of the formula (3) as a host.
이상에서 살펴본 바와 같이, 본 발명에 따른 청색 인광 이리듐 유기착화합물 및 이를 포함하는 유기전기발광소자는 상기 화학식 1 및 화학식 2를 발광소자에 적용시킴으로써 우수한 색순도 구현과 발광효율이 우수하여 유기전기발광소자의 발광물질로 유용하게 활용할 수 있다는 장점을 갖는다.
As described above, the blue phosphorescent iridium organic complex compound and the organic electroluminescent device comprising the same according to the present invention are applied to the light emitting device of Formula 1 and Formula 2 to achieve excellent color purity and excellent luminous efficiency of the organic electroluminescent device It has the advantage that it can be usefully used as a light emitting material.
도 1은 본 발명에 따른 청색 인광 이리듐 유기착화합물을 포함하는 유기전기발광소자의 구조를 보인 단면도.
도 2는 본 발명의 실시 예에 따른 유기전기발광소자의 구조를 보인 단면도.
도 3은 본 발명의 다른 실시 예에 따른 유기전기발광소자의 구조를 보인 단면도.1 is a cross-sectional view showing the structure of an organic electroluminescent device comprising a blue phosphorescent iridium organic complex compound according to the present invention.
2 is a cross-sectional view illustrating a structure of an organic electroluminescent device according to an embodiment of the present invention.
3 is a cross-sectional view illustrating a structure of an organic electroluminescent device according to another embodiment of the present invention.
실시 예 1: 화학식 1a [Ir(chmpy)Example 1 Formula 1a [Ir (chmpy)
22
(pic)]의 합성(pic)] 's synthesis
IrCl3·nH2O 35g(99.263mmol)과 2-(1cyclohexne-1en)4-methylpyridine 39.325g(228.304mmol)을 2-ethoxyethanol과 물 3:1의 혼합용매 200mL에 혼합하여 질소하에서 78℃에서 5시간 동안 환류하였다. 반응 혼합물을 냉각 후에 물 200mL을 첨가한 후 침전물을 여과하여 150㎖ 물에 3회, 150㎖ methanol에 2회 세척하여 이리듐 다이머 60.883g(수율 98.3%)을 수득하였다. 35 g (99.263 mmol) of IrCl 3 nH 2 O and 39.325 g (228.304 mmol) of 2- (1cyclohexne-1en) 4-methylpyridine were mixed with 200 mL of a mixed solvent of 2-ethoxyethanol and water 3: 1 at 5 ° C under 78 ° C under nitrogen. Reflux for hours. After the reaction mixture was cooled, 200 mL of water was added, and then the precipitate was filtered and washed three times with 150 mL of water and twice with 150 mL of methanol to obtain 60.883 g (yield 98.3%) of iridium dimer.
제조된 이리듐 다이머 20g(15.427mmol)과 piclinic acid 11.39g(92.561mmol)과 Na2CO3 16.351g(154.269mmol)을 2-ethoxyethanol 300mL에 혼합하여 질소하에서 135℃에서 18시간 동안 환류하였다. 반응 혼합물을 냉각 후에 물 300mL를 첨가한 후 침전물을 여과하여 물(300mL, 교반세척 5회)과 Hexane(300mL, 1회)과 diethylether(100mL, 3회)로 세척하고 2L의 dichloromethane에 녹여 silica chromatography를 수행한 여과액을 재결정으로 정제하여 13.428g(수율 61.2%)을 수득하였다.(화학식 1a)
20 g (15.427 mmol) of iridium dimer, 11.39 g (92.561 mmol) of piclinic acid, and 16.351 g (154.269 mmol) of Na 2 CO 3 were mixed in 300 mL of 2-ethoxyethanol and refluxed at 135 ° C. for 18 hours under nitrogen. After cooling the reaction mixture, 300 mL of water was added, and then the precipitate was filtered and washed with water (300 mL, stirred and washed 5 times), Hexane (300 mL, 1 time), diethylether (100 mL, 3 times), and dissolved in 2 L of dichloromethane, followed by silica chromatography. The filtrate was purified by recrystallization to give 13.428 g (yield 61.2%).
[화학식 1a][Formula 1a]
실시 예 2: 화학식 2a [Ir(dfphpy)Example 2: Formula 2a [Ir (dfphpy)
22
(pic)]의 합성(pic)] 's synthesis
IrCl3·nH2O 35g(99.263mmol)과 2-(2,4fluorophenyl)3methylpyrrole 44.106g(228.304mmol)을 2-ethoxyethanol과 물 3:1의 혼합용매 200mL에 혼합하여 질소하에서 78℃에서 5시간 동안 환류하였다. 반응 혼합물을 냉각 후에 물 200mL을 첨가한 후 침전물을 여과하여 150㎖ 물에 3회, 150㎖ methanol에 2회 세척하여 이리듐 다이머 62.72g(수율 98.3%)을 수득하였다.35 g (99.263 mmol) of IrCl 3 nH 2 O and 44.106 g (228.304 mmol) of 2- (2,4fluorophenyl) 3 methylpyrrole were mixed with 200 mL of a mixed solvent of 2-ethoxyethanol and water 3: 1 for 5 hours at 78 ° C. under nitrogen. It was refluxed. After the reaction mixture was cooled, 200 mL of water was added, and then the precipitate was filtered and washed three times with 150 mL of water and twice with 150 mL of methanol to obtain 62.72 g (yield 98.3%) of iridium dimer.
제조된 이리듐 다이머 20g(15.427mmol)과 picolinic acid 11.39g(92.561mmol)과 Na2CO3 16.351g(154.269mmol)을 2-ethoxyethanol 300mL에 혼합하여 질소하에서 135℃에서 18시간 동안 환류하였다. 반응 혼합물을 냉각 후에 물 300mL를 첨가한 후 침전물을 여과하여 물(300mL, 교반세척 5회)과 Hexane(300mL, 1회)과 diethylether(100mL, 3회)로 세척하고 2L의 dichloromethane에 녹여 silica chromatography를 수행한 여과액을 재결정으로 정제하여 14.568g (수율 59.2%)을 수득하였다. (화학식 2a)
20 g (15.427 mmol) of iridium dimer, 11.39 g (92.561 mmol) of picolinic acid, and 16.351 g (154.269 mmol) of Na 2 CO 3 were mixed with 300 mL of 2-ethoxyethanol and refluxed at 135 ° C. for 18 hours under nitrogen. After cooling the reaction mixture, 300 mL of water was added, and then the precipitate was filtered and washed with water (300 mL, stirred and washed 5 times), Hexane (300 mL, 1 time), diethylether (100 mL, 3 times), and dissolved in 2 L of dichloromethane, followed by silica chromatography. The filtrate was purified by recrystallization to give 14.568 g (59.2% yield). (Formula 2a)
[화학식 2a](2a)
실시 예 3: 화학식 1a와 화학식 2a의 화합물을 이용한 유기전기발광소자의 제조Example 3 Fabrication of Organic Electroluminescent Device Using Compound of Formula 1a and Formula 2a
상기 실시 예1로부터 얻어진 유기발광화합물을 발광물질로 사용하여 유기전기발광소자를 제조하였다.An organic electroluminescent device was manufactured using the organic light emitting compound obtained in Example 1 as a light emitting material.
도 2 또는 도 3의 유기전기발광소자의 구조를 참고하여 살펴보면,Referring to the structure of the organic electroluminescent device of FIG. 2 or FIG. 3,
ITO로 코팅된 유리기판 위에 2-TNATA을 증착하여 40nm의 정공주입층(12)을 형성한 후, 그 위에 NPB를 증착하여 40nm의 정공수송층(13)을 형성하였으며, 이어서 MCP를 호스트로 하여 실시 예 1에서 얻은 화학식 1a의 화합물을 MCP의 9% 속도(rate)로 도핑하여 정공수송층(13) 위에 발광층(15)을 30nm 형성하였다. 그 위에 Balq를 10nm을 증착하여 정공이 발광층(15)을 지나 전자수송층(17)으로 이동하는 것을 방지하는 정공차단층(16)을 형성하고, Alq3를 증착하여 40nm의 전자수송층(17)을 형성하였고 LiF를 증착하여 1nm의 전자주입층(18)을 형성하였다. 그 전자주입층(18) 위에 Al을 증착하여 120nm의 음극(19)을 형성하여 유기전계발광소자를 제조하였다.After depositing 2-TNATA on ITO-coated glass substrate to form a
각 물질의 증착속도는 유기물질인 2-TNATA(화학식 4), NPB(화학식 5), CBP, Alq3(화학식 6), Balq(화학식 7)는 0.1 nm/초의 속도로 증착하였고 LiF는 0.01 nm/초, 알루미늄은 0.5 nm/초의 속도로 증착하였다
The deposition rate of each material was 2-TNATA (Formula 4), NPB (Formula 5), CBP, Alq 3 (Formula 6), Balq (Formula 7) at 0.1 nm / sec and LiF was 0.01 nm. / Second, aluminum was deposited at a rate of 0.5 nm / second
이를 대상으로 소자의 특성을 측정한 결과,As a result of measuring the characteristics of the device,
화학식 1a는 초기 구동 전압이 5.7V에서 휘도가 100cd/㎡이고 발광효율은 8.9 cd/A임을 확인하였으며, 구동전압 11V에서 휘도가 1,000cd/㎡, 발광효율이 7.46 cd/A 이고, 이때 색 좌표는 (x,y) = (0.20, 0.21)이었다.Formula 1a confirms that the luminance is 100cd / m2 and the luminous efficiency is 8.9 cd / A at the initial driving voltage of 5.7V. The luminance is 1,000cd / m2 and the luminous efficiency is 7.46 cd / A at the driving voltage of 11V. Was (x, y) = (0.20, 0.21).
화학식 2a는 초기 구동 전압이 6.1V에서 휘도가 100cd/㎡ 이고 발광효율은 10.9 cd/A임을 확인하였으며, 구동전압 12.5에서 휘도가 1,000cd/㎡, 발광효율이 8.46 cd/A 이고, 이때 색 좌표는 (x,y) = (0.16, 0.19)이었다.
Formula 2a confirms that the luminance is 100 cd / m2 and the luminous efficiency is 10.9 cd / A at an initial driving voltage of 6.1V. The luminance is 1,000 cd / m2 and the luminous efficiency is 8.46 cd / A at a driving voltage of 12.5. Was (x, y) = (0.16, 0.19).
본 발명에 따른 청색 인광 이리듐 유기착화합물 및 이를 포함하는 유기전기발광소자는 전기적 안정성 및 발광효율이 우수하며, 고휘도 발광 및 높은 색 순도 구현이 가능하여 높은 산업상 이용가능성을 갖는다.
The blue phosphorescent iridium organic complex according to the present invention and the organic electroluminescent device including the same have excellent electrical stability and luminous efficiency, and have high industrial applicability since high luminance and high color purity can be realized.
1 : 유기전기발광소자
11: 양극
12: 정공주입층
13: 정공수송층
14: 전자차단층
15: 발광층
16: 정공차단층
17: 전자수송층
18: 전자주입층
19: 음극1: Organic electroluminescent device
11: anode
12: hole injection layer
13: hole transport layer
14: electronic blocking layer
15: light emitting layer
16: hole blocking layer
17: electron transport layer
18: electron injection layer
19: cathode
Claims (6)
[화학식 2]
상기 식에서 X1, X2, X3, X4는 각각 독립적으로 수소, 할로겐, 카복실, 아미노, 시아노, 니트로, C1-6의 직쇄형 또는 분자형의 알킬 또는 알콕시, C6-18의 치환되거나 비치환된 아릴 또는 C4-6의 헤테로 고리이거나, 서로 융화하여 융합고리 또는 다중융합고리이다.
n은 2이상, m은 0이상의 정수이며 그 합은 3이다.
L은 치환 또는 비치환된 탄소수 6 내지 30의 아릴기 또는 치환 또는 비치환된 탄소수 2 내지 30의 헤테로아릴기이다.
Blue phosphorescent iridium organic complex of formula (2).
(2)
Wherein X 1 , X 2 , X 3 , X 4 are each independently hydrogen, halogen, carboxyl, amino, cyano, nitro, C 1-6 linear or molecular alkyl or alkoxy, C 6-18 Substituted or unsubstituted aryl or a C 4-6 hetero ring, or a fused ring or a multifused ring which are mutually fused together.
n is an integer of 2 or more, m is an integer of 0 or more, and the sum is 3.
L is a substituted or unsubstituted aryl group having 6 to 30 carbon atoms or a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms.
[화학식 2a]
Blue phosphorescent iridium complex of formula (2a).
(2a)
상기 발광층(15)은 청구항 2의 청색 인광 이리듐 착화합물을 도펀트로 포함하는 것임을 특징으로 하는 청색 인광 이리듐 착화합물을 포함하는 유기전기발광소자.
In the light emitting device comprising the light emitting layer 15 between the positive electrode 11 and the positive electrode 11 of the negative electrode 19,
The light emitting layer 15 is an organic electroluminescent device comprising a blue phosphorescent iridium complex of claim 2 comprising a blue phosphorescent iridium complex as a dopant.
발광소자는 양극(11)의 상부로 정공주입층(12), 정공수송층(13), 발광층(15), 전자수송층(17), 전자주입층(18) 및 음극(19)이 순차적으로 적층되어 다층의 일체 구조를 갖는 것임을 특징으로 하는 청색 인광 이리듐 착화합물을 포함하는 유기전기발광소자.
The method of claim 4,
In the light emitting device, a hole injection layer 12, a hole transport layer 13, a light emitting layer 15, an electron transport layer 17, an electron injection layer 18, and a cathode 19 are sequentially stacked on the anode 11. An organic electroluminescent device comprising a blue phosphorescent iridium complex compound, characterized in that it has a multi-layered integral structure.
정공수송층(13)과 발광층(15) 사이, 또는 발광층(15)과 전자수송층(17) 사이로 전자차단층(14) 또는 정공차단층(16)이 추가로 적층되어 구성되는 것임을 특징으로 하는 청색 인광 이리듐 착화합물을 포함하는 유기전기발광소자.The method according to claim 5,
Blue phosphorescence, characterized in that the electron blocking layer 14 or the hole blocking layer 16 is further stacked between the hole transport layer 13 and the light emitting layer 15, or between the light emitting layer 15 and the electron transport layer 17. An organic electroluminescent device comprising an iridium complex.
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