CN110804047A - 热活化延迟荧光材料及其制备方法 - Google Patents
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Abstract
本发明公开一种热活化延迟荧光材料,包括具有如式(I)所示结构的化合物:A‑D(I),其中A是电子受体及D是电子给体。另外,本发明还公开热活化延迟荧光材料的制备方法和一种使用热活化延迟荧光材料作为荧光主体材料的有机发光二极管显示装置。有机发光二极管显示装置包括阳极、阴极以及位于阳极与阴极之间的有机功能层,有机功能层包括具有式(I)结构的热活化延迟荧光材料。
Description
技术领域
本发明是有关于一种有机光电材料技术领域,特别是有关于一种热活化延迟荧光材料及其制备方法。
背景技术
发光客体材料是影响有机发光二极管显示装置发光效率的主要因素之一。有机发光二极管显示装置使用的发光客体材料为荧光材料,通常在有机发光二极管显示装置中的单重态和三重态的激子比例为1:3,因此有机发光二极管显示装置的内量子效率(internalquantum efficiency,IQE)只能达到25%,荧光电致发光器件的应用受到限制。重金属配合物磷光材料基于重原子的自旋轨道耦合作用,因此能够同时利用单重态和三重态激子而实现100%的内量子效率。然而,通常使用的重金属都是铱(Ir)、铂(Pt)或锇(Os)等贵重金属具有高毒性及高成本。另外,纯有机热活化延迟荧光材料具有较低的最低单三重态的能级差(Lowest single-triplet energy gap(ΔEST)),三重态激子可以通过反向系间窜越(reverse intersystem crossing,RISC)回到单重态,再通过辐射跃迁至基态而发光,从而能够同时利用单重态激子及三重态激子,也可以实现100%的内量子效率。
针对热活化延迟荧光材料,高反向系间窜越常数以及高的光致发光量子产率是制备高效率有机发光二极管显示装置的必要条件。目前,具备上述条件的热活化延迟荧光材料相对于重金属配合物而言还是比较缺乏。
发明内容
本发明实施例提供一种热活化延迟荧光材料,此种热活化延迟荧光材料能够降低最低单三重态的能级差,从而获得具有高发光效率的有机发光二极管显示装置。
本发明实施例的一种热活化延迟荧光材料,包括如式(I)所示的结构:
A-D(I),
其中A是电子受体及D是电子给体,电子受体包括如下所示化学结构式的任意一种:
在本发明实施例中,热活化延迟荧光材料包括如下所示化学结构式的其中一种:
本发明另一实施例提供一种热活化延迟荧光材料的制备方法,包括:S1混合氟苯甲酰氯化物和具有卤素取代基的含氮杂环化合物,得到混合物;S2在所述混合物中添加第一化合物,反应后得到化合物A-X,其中所述第一化合物具有以下结构式:
A-D(I)。
在本发明实施例中,氟苯甲酰氯化物是4-氟苯甲酰氯。
在本发明实施例中,具有卤素取代基的含氮杂环化合物是4-氟-2-碘嘧啶。
在本发明实施例中,在步骤S2中,在添加第一化合物的同时还包括添加三氯化铝。
在本发明实施例中,在步骤S3中,萃取是使用二氯甲烷进行萃取。
在本发明实施例中,在步骤S3中,干燥使用的干燥剂包括无水硫酸镁及无水硫酸钠。
在本发明实施例中,热活化延迟荧光材料在有机发光二极管显示装置中作为荧光主体材料。
附图说明
图1是本发明实施例的热活化延迟荧光材料的荧光发射光谱图;以及
图2是本发明实施例的有机发光二极管显示装置的示意图。
具体实施方式
一般热活化延迟荧光材料具有电子给体和电子受体相结合的分子结构,本发明实施例通过具有不同的电子给体及电子受体的热活化延迟荧光材料,从而获得具有高发光效率的有机发光二极管显示装置。
在本发明实施例中,一种热活化延迟荧光材料包括如式(I)所示的结构:
A-D(I),
其中A是电子受体及D是电子给体,电子受体包括如下所示化学结构式的任意一种:
为使本领域的技术人员能明了本发明实施例热活化延迟荧光材料的合成过程,以下进一步描述本发明不同实施例的热活化延迟荧光材料的合成步骤,许多替代、修改及变化对于那些本领域的技术人员将是显而易见的。因此不会对本发明实施例的所有化合物作一一说明。
在本发明另一实施例中,本发明另一实施例提供一种热活化延迟荧光材料的制备方法,包括:
S1混合氟苯甲酰氯化物和具有卤素取代基的含氮杂环化合物,得到混合物;
S2在所述混合物中添加第一化合物,反应后得到化合物A-X,其中所述第一化合物具有以下结构式:
A-D(I)。
热活化延迟荧光材料包括及再者,热活化延迟荧光材料在有机发光二极管显示装置中作为荧光主体材料。详言之,在步骤S2中,在添加第一化合物的同时还包括添加三氯化铝。在步骤S3中,萃取是使用二氯甲烷进行萃取。在步骤S3中,干燥使用的干燥剂包括无水硫酸镁及无水硫酸钠。
以下更进一步描述本发明实施例的热活热活化延迟荧光材料的合成步骤。
首先在反应瓶中加入4-氟苯甲酰氯(1摩尔)、4-氟-2-碘嘧啶(1摩尔)、5%Pd2dba3·CHCl3(0.05摩尔),、10%Xantphos(0.1摩尔)及C6D6,并在110℃下反应20小时,形成中间产物
接着加入三氯化铝(1.60,12毫摩尔)及化合物加入持续搅拌的脱水二氯甲烷的溶液中(50mL),且在冰浴中保持15分钟。然后将反应混合物加热回到室温并搅拌3小时。同时用冰水和盐酸(30mL,体积比2:1)进行淬灭反应,并用二氯甲烷萃取数次。将合并的有机层用水洗涤两次,然后经无水硫酸镁进行干燥。过滤并减压蒸发溶剂后,得到残余物,接着通过硅胶柱色谱法进行纯化(二氯甲烷:石油醚,体积比1:3),得到3.51克的白色固体,白色固体是(4-溴嘧啶-2-基)(5,5-二氧二苯并[b,d]噻吩-2-基)甲酮产率是96%。
接着加入(4-溴嘧啶-2-基)(5,5-二氧二苯并[b,d]噻吩-2-基)甲酮(3.208克,8毫摩尔)、10H-吩恶(1.61克,8.8毫摩尔)、Pd2(dba)3(0.15克,0.16毫摩尔)、tPBu3 HBF4(0.18克,0.64毫摩尔)和叔丁醇钠(1.92克,20毫摩尔)到100mL的反应瓶中,用氩气进行抽换气,然后加入无水无氧甲苯(40mL)。在氩气保护下,回流反应过夜。冷却后,用二氯甲烷(DCM)反复萃取三次以及水洗三次,然后用无水硫酸钠进行干燥,接着进行过滤和浓缩。最后以硅胶柱层析,并以石油醚/二氯甲烷(体积比8:1)作为淋洗剂,最后得到3.42g白色固体化合物I产率是85%。产物鉴定数据:HRMS[M+H]+calcd.forC29H17N3O4S:503.09;found:504.08。
首先在反应瓶中加入4-氟苯甲酰氯(1摩尔)、4-氟-2-碘嘧啶(1摩尔)、5%Pd2dba3·CHCl3(0.05摩尔),、10%Xantphos(0.1摩尔)及C6D6,并在110℃下反应20小时,形成中间产物
接着加入三氯化铝(1.60,12毫摩尔)及化合物加入持续搅拌的脱水二氯甲烷的溶液中(50mL),且在冰浴中保持15分钟。然后将反应混合物加热回到室温并搅拌3小时。同时用冰水和盐酸(30mL,体积比2:1)进行淬灭反应,并用二氯甲烷萃取数次。将合并的有机层用水洗涤两次,然后经无水硫酸镁进行干燥。过滤并减压蒸发溶剂后,得到残余物,接着通过硅胶柱色谱法进行纯化(二氯甲烷:石油醚,体积比1:3),得到3.51克的白色固体,白色固体是(4-溴嘧啶-2-基)(5,5-二氧二苯并[b,d]噻吩-2-基)甲酮产率是96%。
接着加入(4-溴嘧啶-2-基)(5,5-二氧二苯并[b,d]噻吩-2-基)甲酮(3.208克,8毫摩尔)、9,9-二苯基-9,10-二氢吖啶(2.93克,8.8毫摩尔)、Pd2(dba)3(0.15克,0.16毫摩尔)、tPBu3 HBF4(0.18克,0.64毫摩尔)和叔丁醇钠(1.92克,20毫摩尔)到100mL的反应瓶中,用氩气进行抽换气,然后加入无水无氧甲苯(40mL)。在氩气保护下,回流反应过夜。冷却后,用二氯甲烷(DCM)反复萃取三次以及水洗三次,然后用无水硫酸钠进行干燥,接着进行过滤和浓缩。最后以硅胶柱层析,并以石油醚/二氯甲烷(体积比8:1)作为淋洗剂,最后得4.34g白色固体化合物化合物II产率是83%。产物鉴定数据:HRMS[M+H]+calcd.for C42H27N3O3S:654.18;found:654.16。
参考图1,图1是本发明实施例的热活化延迟荧光材料(化合物I及化合物II)的荧光发射光谱。
化合物I及目标化合物II的最低单重态(S1)、最低三重态能级(T1)、最低单三重态的能级差(ΔEST)、最高占据分子轨域(Highest Occupied Molecular Orbital,HOMO)和最低未占分子轨域(Lowest Unoccupied Molecular Orbital,LUMO)如下表1所示:
表1
PL Peak(nm) | S<sub>1</sub>(eV) | T<sub>1</sub>(eV) | ΔE<sub>ST</sub>(eV) | HOMO(eV) | LUMO(eV) | |
化合物I | 447 | 2.78 | 2.66 | 0.12 | -5.97 | -2.39 |
化合物II | 449 | 2.76 | 2.96 | 0.07 | -5.97 | -2.37 |
在本发明另一实施例中,一种有机发光二极管显示装置包括阳极、阴极以及位于阳极与阴极之间的有机功能层,有机功能层包括热活化延迟荧光材料,热活化延迟荧光材料包括如式(I)所示的结构:
A-D(I),
其中A是电子受体及D是电子给体,电子受体包括如下所示化学结构式的任意一种:
参考图2,本发明实施例的热活化延迟荧光材料作为有机发光二极管显示装置的发光层。有机发光二极管显示装置包括玻璃和导电玻璃(ITO)层10、空穴注入层20、空穴传输层30、发光层40、电子传输层50及阴极层60。具体而言,空穴注入层20是由聚3,4-乙撑二氧噻吩:聚苯乙烯磺酸盐(PEDOT:PS)组成;空穴传输层30是由4,4'-环己基二[N,N-二(4-甲基苯基)苯胺]-TAPC组成;发光层40是由前述热活化延迟荧光材料组成;电子传输层50是由1,3,5-三(3-(3-吡啶基)苯基)苯组成;阴极层60由氟化锂及铝组成。有机发光二极管显示装置可按本发明技术领域已知的方法完成,故不再赘述。
优选地,荧光主体材料的化学结构式如下化合物I所示:
更优选地,荧光主体材料的化学结构式如下化合物II所示:
有机发光二极管显示装置的电流、亮度及电压特性是由带有校正过的硅光电二极管的Keithley源测量系统(Keithley 2400Sourcemeter、Keithley 2000Currentmeter)完成的,电致发光光谱是由法国JY公司SPEX CCD3000光谱仪测量的,所有测量均在正常大气压及室温中完成。
有机发光二极管显示装置I及有机发光二极管显示装置II分别使用含有化合物I及化合物II,其性能数据如下表2所示:
本发明实施例提供的热活化延迟荧光材料能够降低最低单三重态的能级差,从而获得具有高发光效率的有机发光二极管显示装置。
虽然本发明结合其具体实施例而被描述,应该理解的是,许多替代、修改及变化对于那些本领域的技术人员将是显而易见的。因此,其意在包含落入所附权利要求书的范围内的所有替代、修改及变化。
Claims (10)
4.如权利要求3所述热活化延迟荧光材料的制备方法,其特征在于,所述氟苯甲酰氯化物是4-氟苯甲酰氯。
5.如权利要求3所述热活化延迟荧光材料的制备方法,其特征在于,所述具有卤素取代基的含氮杂环化合物是4-氟-2-碘嘧啶。
6.如权利要求3所述热活化延迟荧光材料的制备方法,其特征在于,在所述步骤S2中,在添加所述第一化合物的同时还包括添加三氯化铝。
8.如权利要求3所述热活化延迟荧光材料的制备方法,其特征在于,在所述步骤S3中,所述萃取是使用二氯甲烷进行萃取。
9.如权利要求3所述热活化延迟荧光材料的制备方法,其特征在于,在所述步骤S3中,所述干燥使用的干燥剂包括无水硫酸镁及无水硫酸钠。
10.如权利要求3所述热活化延迟荧光材料的制备方法,其特征在于,所述热活化延迟荧光材料在有机发光二极管显示装置中作为荧光主体材料。
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