CN108264485B - 一种基于螺[芴-9,2’-咪唑]的双极性主体材料、合成方法及应用 - Google Patents
一种基于螺[芴-9,2’-咪唑]的双极性主体材料、合成方法及应用 Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 50
- 150000002220 fluorenes Chemical class 0.000 title claims abstract description 17
- 238000010189 synthetic method Methods 0.000 title abstract description 3
- UJOBWOGCFQCDNV-UHFFFAOYSA-N 9H-carbazole Chemical compound C1=CC=C2C3=CC=CC=C3NC2=C1 UJOBWOGCFQCDNV-UHFFFAOYSA-N 0.000 claims abstract description 18
- 150000001875 compounds Chemical class 0.000 claims abstract description 15
- 125000004178 (C1-C4) alkyl group Chemical group 0.000 claims abstract description 13
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 13
- 150000002367 halogens Chemical class 0.000 claims abstract description 13
- 125000001484 phenothiazinyl group Chemical group C1(=CC=CC=2SC3=CC=CC=C3NC12)* 0.000 claims abstract description 13
- 125000003545 alkoxy group Chemical group 0.000 claims abstract description 12
- 125000000641 acridinyl group Chemical group C1(=CC=CC2=NC3=CC=CC=C3C=C12)* 0.000 claims abstract description 10
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- 239000001257 hydrogen Substances 0.000 claims abstract description 5
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- -1 alkoxy Acridine Chemical compound 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
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- BWHDROKFUHTORW-UHFFFAOYSA-N tritert-butylphosphane Chemical compound CC(C)(C)P(C(C)(C)C)C(C)(C)C BWHDROKFUHTORW-UHFFFAOYSA-N 0.000 description 4
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- 238000001644 13C nuclear magnetic resonance spectroscopy Methods 0.000 description 2
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
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- 239000003480 eluent Substances 0.000 description 2
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
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- 230000027756 respiratory electron transport chain Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 2
- MFRIHAYPQRLWNB-UHFFFAOYSA-N sodium tert-butoxide Chemical compound [Na+].CC(C)(C)[O-] MFRIHAYPQRLWNB-UHFFFAOYSA-N 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
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- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- YOXUOHDHFCBGHY-UHFFFAOYSA-N 1-bromofluoren-9-one Chemical compound C12=CC=CC=C2C(=O)C2=C1C=CC=C2Br YOXUOHDHFCBGHY-UHFFFAOYSA-N 0.000 description 1
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- JSEQNGYLWKBMJI-UHFFFAOYSA-N 9,9-dimethyl-10h-acridine Chemical compound C1=CC=C2C(C)(C)C3=CC=CC=C3NC2=C1 JSEQNGYLWKBMJI-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- HJCUTNIGJHJGCF-UHFFFAOYSA-N acridan acid Natural products C1=CC=C2CC3=CC=CC=C3NC2=C1 HJCUTNIGJHJGCF-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 150000003851 azoles Chemical class 0.000 description 1
- 235000010290 biphenyl Nutrition 0.000 description 1
- 239000004305 biphenyl Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 150000004696 coordination complex Chemical class 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 125000003963 dichloro group Chemical group Cl* 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- 238000001938 differential scanning calorimetry curve Methods 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- YLQWCDOCJODRMT-UHFFFAOYSA-N fluoren-9-one Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3C2=C1 YLQWCDOCJODRMT-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
- 230000005525 hole transport Effects 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
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- 125000005647 linker group Chemical group 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 229940079827 sodium hydrogen sulfite Drugs 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D209/00—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
- C07D209/56—Ring systems containing three or more rings
- C07D209/96—Spiro-condensed ring systems
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D235/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings
- C07D235/02—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings condensed with carbocyclic rings or ring systems
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
- C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
- C07D401/10—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a carbon chain containing aromatic rings
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- C07D401/14—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing three or more hetero rings
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- C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
- C07D403/14—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing three or more hetero rings
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- H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
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- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
- H10K85/6572—Polycyclic condensed heteroaromatic hydrocarbons comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
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- H10K50/00—Organic light-emitting devices
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Abstract
本发明涉及一种基于螺[芴‑9,2’‑咪唑]的双极性主体材料、合成方法及应用,属于有机电子材料领域。双极性主体材料,具有式(I)所述结构的化合物,其中,R1‑R3为示为C1-C4烷基或烷氧基取代或未取代的吖啶基、吩噻嗪基、咔唑、二苯胺,氢,卤素。实验表明,本发明的双极主体材料具有较高的玻璃化转变温度,双极主体材料有利于载流子注入和传输平衡。
Description
技术领域
本发明涉及新型的双极主体材料,属于有机发光材料技术领域,具体涉及一种以螺[芴-9,2’-咪唑]为中心核的双极材料及其应用。
背景技术
有机发光二极管(OLED)具有相应速度快、耗能低、亮度高、视角广、可弯曲、主动发光等特性,受到了科学界和产业界的高度重视。其在显示、照明等方面的应用具有较大的潜力。电致荧光和电致磷光分别被称为第一代和第二代OLED。基于荧光材料的OLED具有稳定性高的特点,但受限于量子统计学定律,在电激活作用下,产生的单线态激子和三线态激子的比例为1:3,所以荧光材料电致发光内量子效率最大仅有25%。而磷光材料具有重原子的自旋轨道耦合作用,可以综合利用单线态激子和三线态激子,理论的内量子效率可达100%。磷光材料已经成为市场中主要应用的发光材料。但是基于磷光的OLED具有明显的效率滚降效应,在高亮度应用中有一定的阻碍。另外,磷光材料需用使用Pt,Ir等贵价金属,因此磷光材料价格较高。一般,OLED器件中磷光材料掺杂于有机主体材料中。
磷光材料可以综合利用单线态激子和三线态激子,实现100%的内量子效率。然而,由于过渡金属配合物的激发态激子寿命相对过长,导致三线态-三线态(T1-T1)在器件实际工作中淬灭。为了克服这个问题,研究者们常将磷光材料掺杂于有机主体材料中。因此,对于高效有机发光二极管,开发高性能的主体材料以及客体材料十分重要。
目前,广泛应用于磷光器件的主体材料为CBP(4,4’-二(9-咔唑基)联苯),但是它要求的驱动电压较高、玻璃化转变温度(Tg)低(Tg=62℃),易于结晶。另外,CBP是一种P型材料,空穴迁移率远高于电子迁移率,不利于载流子注入和传输平衡,且发光效率低。
发明内容
针对现有主体(CBP)材料要求的驱动电压较高、玻璃化转变温度易于结晶、载流子注入和传输不平衡等问题,本发明提供一种双极性主体材料,该材料以螺[芴-9,2’-咪唑]作为强拉电子中心核,具有强给电子能力的二苯胺类、咔唑、吖啶等衍生物作为连接基团,形成D-A型、D-A-D型双极性主体材料。
基于螺[芴-9,2’-咪唑]的双极性主体材料,具有式(I)所述结构的化合物,
其中,R1、R2、R3表示为C1-C4烷基或烷氧基取代或未取代的吖啶基、吩噻嗪基、咔唑、二苯胺,氢,卤素,R1、R2、R3至少一个为C1-C4烷基或烷氧基取代或未取代的吖啶基、吩噻嗪基、咔唑、二苯胺。
优选:R1表示为C1-C4烷基或烷氧基取代或未取代的吖啶基、吩噻嗪基、咔唑、二苯胺,R2、R3中至少一个为C1-C4烷基或烷氧基取代或未取代的吖啶基、吩噻嗪基、咔唑、二苯胺,其余为氢。
优选:R1、R3为C1-C4烷基或烷氧基取代或者未取代的吖啶基、吩噻嗪基、咔唑、二苯胺。
优选:R1、R3相同。
式(I)所述的化合物具有下列结构:
有机半导体二极管器件,包括阴极、阳极和有机层,所述有机层为空穴传输层、空穴阻挡层、电子传输层、发光层中的一层或多层。需要特别指出,上述有机层可以根据需要,这些有机层不必每层都存在。
所述式(I)所述的化合物为发光层的材料。
本发明的电子器件有机层的总厚度为1-1000nm,优选1-500nm,更优选5-300nm。
所述有机层可以通过蒸渡或旋涂形成薄膜。
如上面提到,本发明的式(I)所述的化合物如下,但不限于所列举的结构:
上述双极材料的制备方法,包括以下制备步骤:
首先将卤素取代芳基乙二酮(a)与卤素取代或未取代的9-芴酮(b)在醋酸铵和乙酸条件下反应,得到卤素取代的4’,5’-二芳基螺(芴-9,2’-咪唑)(c),最后卤素取代的4’,5’-二芳基螺(芴-9,2’-咪唑)(c)与C1-C4烷基或烷氧基取代或未取代的吖啶、吩噻嗪基、咔唑、二苯胺(d)通过钯催化的Buchwald反应,得到所述的双极性主体材料。
实验表明,本发明的双极主体材料具有较高的玻璃化转变温度(Tg=158℃),双极主体材料有利于载流子注入和传输平衡。
化合物a是由苯乙炔与对碘卤素苯通过Sonogashira偶联反应,再氧化所得;化合物b为市售所得;化合物d为市售所得。
附图说明
图1为化合物2的DSC曲线;
图2为本发明的器件结构图,其中10代表为玻璃基板,20代表为阳极,30代表为空穴注入层,40代表为空穴传输层,50代表发光层,60代表为空穴阻挡,70代表为电子传输,80代表为电子注入层,90代表为阴极。
具体实施方式
下面结合实施例对本发明作进一步详细的描述,但本发明的实施方式不限于此。
实施例1
(1)4’-(4-溴苯基)-5’-苯基螺(芴-9,2’-咪唑)(c1)的合成
合成路线如下所示:
具体合成步骤为:
称取1-(4-溴苯基)-2-苯基乙基-1,2-二酮(14.5g,50mmol)(a1)(通过Sonogashira偶联反应,再氧化制备),9-芴酮(7.2g,40mmol)(b1),醋酸铵(19.2g,250mmol),150mL冰醋酸于250mL的圆底烧瓶中,升温至回流反应搅拌16小时。反应结束后,自然冷却至室温,倒入200mL纯净水中,析出黄色固体。砂芯漏斗抽滤,水洗。硅胶柱层析分离得到9.9g黄色固体。产率:55%。
(2)9,9-二甲基-10-[4-[4’-苯基螺(芴-9,2’-咪唑)-5’-基]苯基]-9,10-二氢吖啶(1)的合成
合成路线如下所示:
具体合成步骤为:
称取4’-(4-溴苯基)-5’-苯基螺(芴-9,2’-咪唑)(0.9g,2mmol)(c1),9,9-二甲基-9,10-二氢吖啶(0.46g,2.2mmol)(d1),Pd2(dba)3(0.18g,0.2mmol),NaOtBu(0.39g,4mmol)于25mL三口烧瓶中,换氮气三次。三叔丁基膦甲苯溶液(0.15g,0.42mmol)溶于10mL干燥的甲苯中,注入到反应瓶中。升温回流16小时。反应结束后,加入5%的亚硫酸氢钠溶液,二氯甲烷萃取,合并有机层,无水硫酸镁干燥。砂芯漏斗过滤,旋干溶剂,以正己烷:乙酸乙酯=10:1为洗脱剂,硅胶层析柱提纯,分离得到1.03g黄色粉末固体。再用4mL二氯甲烷溶解,加入20mL甲醇,放置于5℃冰箱析晶,得到0.85g黄色晶体。产率:73%。产物鉴定数据如下:
1H NMR(400MHz,CDCl3)δ=8.02-7.94(m,J=8.3Hz,2H),7.80(d,J=7.1Hz,2H),7.83(d,J=7.8Hz,2H),7.53(d,J=7.3Hz,1H),7.51-7.37(m,8H),7.30-7.22(m,2H),7.05-6.90(m,6H),6.37-6.31(m,J=8.1Hz,2H).13C NMR(100MHz,CDCl3)δ=168.5,167.9,143.7,142.4,140.6,138.7,132.2,132.1,131.9,131.5,131.0,130.3,129.8,129.2,128.6,128.0,126.4,125.4,123.2,121.0,121.0,114.1,110.3,53.5,36.1,31.2ppm.Ms(ESI:Mz577)(M+1)
实施例2
(1)2-溴-4’-(4-溴苯基)-5’-苯基螺(芴-9,2’-咪唑)(c2)的合成
合成路线如下所示:
称取1-(4-溴苯基)-2-苯基乙基-1,2-二酮(4.34g,15mmol)(a1)(通过Sonogashira偶联反应,再氧化制备),2-溴-9-芴酮(3.89g,15mmol),醋酸铵(5.8g,75mmol),30mL冰醋酸于50mL的圆底烧瓶中,升温至回流反应搅拌16小时。反应结束后,自然冷却至室温,倒入100mL纯净水中,析出黄色固体。砂芯漏斗抽滤,水洗。硅胶柱层析分离得到4.1g黄色固体。产率:52%。
(2)10-(4-(2-(9,9-二甲基吖啶-10(9H)-基)-4’-苯基螺(芴-9,2’-咪唑)-5’-基]苯基]-9,9-二甲基-9,10-二氢吖啶(2)的合成
合成路线如下所示:
具体合成步骤为:
称取2-溴-4’-(4-溴苯基)-5’-苯基螺(芴-9,2’-咪唑)(1g,1.9mmol)(c2),9,9-二甲基-9,10-二氢吖啶(0.79g,3.8mmol)(d1),Pd2(dba)3(0.18g,0.2mmol),NaOtBu(0.73g,7.6mmol)于25mL三口烧瓶中,换氮气三次。三叔丁基膦甲苯溶液(0.12g,0.6mmol)溶于10mL干燥的甲苯中,注入到反应瓶中。升温回流16小时。反应结束后,加入5%的亚硫酸氢钠溶液,二氯甲烷萃取,合并有机层,无水硫酸镁干燥。砂芯漏斗过滤,旋干溶剂,以正己烷:乙酸乙酯=10:1为洗脱剂,硅胶层析柱提纯,分离得到1.35g黄色粉末固体。再用4mL二氯甲烷溶解,加入20mL甲醇,放置于5℃冰箱析晶,得到1.1g黄色晶体。产率:73%。产物鉴定数据如下:
1H NMR(400MHz,CDCl3)δ=8.08(d,J=7.9Hz,1H),7.95-7.87(m,3H),7.72(d,J=7.2Hz,2H),7.56-7.48(m,2H),7.48-7.41(m,7H),7.38(d,J=8.3Hz,2H),7.32(s,1H),7.04-6.86(m,10H),6.43-6.36(m,2H),6.34-6.27(m,2H),1.67(s,12H)ppm.13C NMR(100MHz,CDCl3)δ=168.9,168.3,143.8,142.5,141.7,141.5,140.8,140.7,140.5,139.1,133.1,131.9,131.7,131.5,131.1,130.3,130.1,129.9,129.2,128.6,128.4,126.5,126.5,126.4,125.4,125.3,123.3,123.1,121.3,120.9,120.7,114.3,114.1,110.0,,53.5,36.0,36.0,31.6,31.2ppm.Ms(ESI:Mz 784)(M+1)。Tg=158℃。
实施例3
玻璃化转变温度测试
氮气保护下,以20℃/min的加热和冷却速率用示差扫描量热法(DSC)测试化合物2的玻璃化转变温度。测得化合物2的玻璃化转变温度Tg为158℃(图1)。而文献所报道的CBP的玻璃化转变温度仅为62℃。
可见,本发明中的化合物比常用主体材料CBP具有更高的玻璃化转变温度,本发明显著提高了主体材料的热稳定性。
实施例4
电致发光器件的制备
器件结构为ITO/MoO3(10nm)/NPB(40nm)/化合物2:Ir(ppy):(7wt%,30nm)/BCP(10nm)/Alq3(30nm)/LiF(1nm)/AL(100nm)(见图2)
器件制备方式描述如下:
首先,将透明导电ITO玻璃基板(包含10和20)按照以下步骤处理:预先用洗涤剂溶液、去离子水,乙醇,丙酮,去离子水洗净,再经氧等离子处理30秒。
然后,在ITO上蒸渡10nm厚的MoO3作为空穴注入层30。
然后,在空穴注入层上蒸渡40nm厚的NPB作为空穴传输层40。
然后,在空穴传输层上蒸渡30nm厚的化合物2:Ir(ppy):(7wt%)作为发光层50。
然后,在发光层上蒸渡10nm厚的BCP作为空穴阻挡层60。
然后,在空穴阻挡层上蒸渡30nm厚的Alq3作为电子传输层70。
然后,在电子传输层上蒸渡1nm厚的Alq3作为电子注入层80。
最后,在电子注入层上蒸渡100nm厚的铝作为器件阴极90。
所制备的器件在20mA/cm2的工作电流密度下,亮度5224cd/m2,电流效率为26.12cd/A,发射绿光CIEx为0.307,CIEy为0.620。
比较例
电致发光器件的制备
器件结构为ITO/MoO3(10nm)/NPB(40nm)/CBP:Ir(ppy):(7wt%,30nm)/BCP(10nm)/Alq3(30nm)/LiF(1nm)/AL(100nm)
方法同实施例4,但使用常用市售化合物CBP作为主体材料,制作对比用电致发光有机半导体二极管器件。
所制备的器件在20mA/cm2的工作电流密度下,亮度3875cd/m2,电流效率为19.38cd/A,发射绿光CIEx为0.312,CIEy为0.620。
通过对比实施例4和比较例的实验结果可见,本发明中的双极主体材料相比于广泛使用的主体材料CBP,更利于载流子注入和传输平衡,使用本发明的有机材料制备的器件具有更好的电致发光性能,更符合高性能有机半导体器件对主体材料的要求。
Claims (10)
1.一种双极性主体材料,为具有式(I)所述结构的化合物,
其中,R1、R2、R3独立选自C1-C4烷基或烷氧基取代或未取代的吖啶基、吩噻嗪基、咔唑基或二苯胺基以及氢、卤素;R1、R2、R3至少一个为C1-C4烷基或烷氧基取代或未取代的吖啶基、吩噻嗪基、咔唑基或二苯胺基。
2.根据权利要求1所述的双极性主体材料,R1表示为C1-C4烷基或烷氧基取代或未取代的吖啶基、吩噻嗪基、咔唑基或二苯胺基,R2、R3中至少一个为C1-C4烷基或烷氧基取代或未取代的吖啶基、吩噻嗪基、咔唑基或二苯胺基,其余为氢。
3.根据权利要求2所述的双极性主体材料,R1、R3为C1-C4烷基或烷氧基取代或者未取代的吖啶基、吩噻嗪基、咔唑基或二苯胺基。
4.根据权利要求3所述的双极性主体材料,其中R1、R3相同。
5.根据权利要求4所述的双极性主体材料,为下列结构化合物之一:
6.根据权利要求5所述的双极性主体材料,为下列结构的化合物:
7.一种根据权利要求2-6任一项所述的双极性主体材料的制备方法,采用以下步骤制得:
(1)提供卤素取代的4’,5’-二芳基螺(芴-9,2’-咪唑)化合物,
(2)卤素取代的4’,5’-二芳基螺(芴-9,2’-咪唑)与C1-C4烷基或烷氧基取代或未取代的吖啶、吩噻嗪基、咔唑、二苯胺通过钯催化的布赫瓦尔德反应,得到所述的双极性主体材料。
8.根据权利要求7所述的制备方法,其中步骤(1)中化合物制备方法为:将卤素取代芳基乙二酮与卤素取代或未取代的9-芴酮在醋酸铵和乙酸条件下反应,得到卤素取代的4’,5’-二芳基螺(芴-9,2’-咪唑)。
9.根据权利要求8所述的制备方法,其制备反应步骤为:
10.权利要求1-6任一项所述的双极性主体材料在有机电致发光器件中的应用。
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