CN113214229B - 芴基热活化延迟荧光材料及其制备方法和应用 - Google Patents
芴基热活化延迟荧光材料及其制备方法和应用 Download PDFInfo
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Abstract
Description
技术领域
本发明涉及一种芴基热活化延迟荧光材料及其制备方法和应用,属于有机半导体材料技术领域。
背景技术
近年来,平板显示技术与白光照明技术发展尤其迅速。其中,有机电致发光二极管(OLED,Organic Light-emitting Diodes)被认为是传统无机发光器件的良好替代品。基于有机电子材料的半导体器件,因其成本低、易制备、柔性可折叠和可大面积应用等优势,受到国内外科研学者的广泛关注。
OLED的器件结构相对复杂,包括载流子注入层、传输层、发光层以及电极层等,而其核心发光层的有机材料是电致发光器件的关键。根据自旋统计理论,电激发电子按1:3比例分别产生单线态和三线态激子,而选择规则使得常规荧光材料仅利用0.25的单线态激子,内量子效率限制在25%。为了将各态激子用于辐射发光,重金属配合物磷光和热活化延迟荧光材料分别通过系间窜越和反系间窜越,实现了理论100%内量子效率。其中,纯有机的热活化延迟荧光材料(TADF,Thermally Activated Delayed Fluorescence)不引入贵金属或稀土金属,从分子设计考虑HOMO和LUMO能级的有效分离,保证小的能级差的同时,还能提高发光量子效率,因而在合成成本上比磷光具有更大的优势。
目前,TADF-OLED的制备多采用真空蒸镀工艺,制程复杂,成本高,难以实现大面积应用,而溶液加工工艺能够克服这些问题,是柔性显示面板实现大规模生产的良好选择。众多研究者通过各自的努力,先后开发出各类树枝状和聚合物TADF材料,例如,Ban等人通过主客体一体化策略实现了22.6%高外量子效率蓝光OLED的制备(ACSAppl.Mater.Interfaces2020,12,1190-1200),Rao等人基于“TADF+接头”策略成功构建了共轭PLED达到23.5%的高外部量子效率(Angew.Chem.Int.Ed.2020,59,1320–1326)。
然而,可溶液加工TADF材料的设计开发,需要综合考虑合成成本、成膜性、热稳定性、电化学稳定性等多个因素,最终期望获得高外量子效率、高色纯度和低滚降效率等优异的器件性能。现有溶液法制备OLED,特别是蓝光OLED,由于自身短波所需的能量较高,依然存在很多问题,比如驱动电压高、主客体分离、电荷传输不平衡等,导致器件效率相对低下,工作寿命也难以延长。
有鉴于此,确有必要提出一种芴基热活化延迟荧光材料,以解决上述问题。
发明内容
本发明的目的在于提供一种芴基热活化延迟荧光材料及其制备方法和应用,该材料作为有机发光材料应用于有机电致发光器件中,能表现出较高的电流效率和功率效率,以及较低的工作电压和较长的发光寿命。
为实现上述目的,本发明提供了一种芴基热活化延迟荧光材料,包括电子给体单元、电子受体单元以及烷芳基芴单元,所述电子给体单元连接所述电子受体单元和烷芳基芴单元,所述芴基热活化延迟荧光材料的化学结构通式为:
作为本发明的进一步改进,所述芴基热活化延迟荧光材料包括以下四种结构:
为实现上述目的,本发明还提供了一种芴基热活化延迟荧光材料的制备方法,应用于前述的芴基热活化延迟荧光材料,包括以下步骤:
制备烷芳基芴单元;
制备电子给/受体单元;
制备芴基热活化延迟荧光材料。
作为本发明的进一步改进,所述芴基热活化延迟荧光材料包括V型、L型、U1型和U2型四种类型,制备L型、U1型和U2型芴基热活化延迟荧光材料的反应路线通式为:
作为本发明的进一步改进,制备V型芴基热活化延迟荧光材料的反应路线通式为:
为实现上述目的,本发明还提供了一种有机电致发光器件,包括自下而上层叠设置的ITO层、空穴注入层、发光层、电子传输层、电子注入层及阴极层,所述发光层由前述的芴基热活化延迟荧光材料制成。
作为本发明的进一步改进,所述ITO层为ITO玻璃基板,所述空穴注入层为PEDOT:PSS,所述电子传输层为TmPyPb,所述电子注入层为LiF,所述阴极层为Al。
本发明的有益效果是:本发明的芴基热活化延迟荧光材料使用溶液加工技术制备,成膜性好,表现出良好的稳定性,便于大规模应用;同时,该芴基热活化延迟荧光材料可应用于有机电致发光器件中,表现出较高的电流效率和功率效率,还具有较低的工作电压和较长的发光寿命,在有机发光显示和照明等领域具有良好的应用前景。
附图说明
图1是本发明中V型芴基热活化延迟荧光材料的核磁氢谱曲线图;
图2是本发明中V型芴基热活化延迟荧光材料的核磁碳谱曲线图;
图3是本发明中L型芴基热活化延迟荧光材料的核磁氢谱曲线图;
图4是本发明中L型芴基热活化延迟荧光材料的核磁碳谱曲线图;
图5是本发明中U1型芴基热活化延迟荧光材料的核磁氢谱曲线图;
图6是本发明中U1型芴基热活化延迟荧光材料的核磁碳谱曲线图;
图7是本发明中U2型芴基热活化延迟荧光材料的核磁氢谱曲线图;
图8是本发明中U2型芴基热活化延迟荧光材料的核磁碳谱曲线图;
图9是应用本发明芴基热活化延迟荧光材料的有机电致发光器件的结构示意图。
具体实施方式
为了使本发明的目的、技术方案和优点更加清楚,下面结合附图和具体实施例对本发明进行详细描述。
为实现上述芴基热活化延迟荧光材料的化学结构通式,本发明提供了芴基热活化延迟荧光材料的制备方法,根据的不同,将芴基热活化延迟荧光材料分为V型、L型、U1型和U2型芴基热活化延迟荧光材料,其中,V型、L型、U1型和U2型芴基热活化延迟荧光材料的具体结构为:
当制备V型芴基热活化延迟荧光材料时,V型芴基热活化延迟荧光材料的反应路线通式为:
具体步骤为:向混有9-(4-(4,6-二苯基-1,3,5-三嗪-2-基)苯基)-9H-咔唑(CzTrz,0.50g,1.00mmol)和BF3·Et2O(0.30g,0.32mL)的无水DCM(50mL)中,缓慢滴加50mL溶解有9-(4-(辛氧基)苯基)-9-芴醇(1.10g,3.00mmol)的无水DCM。滴加完成后,将混合物在室温下搅拌3小时。向混合物中加入水(100mL),用以淬灭该反应。淬灭完成后,水相用DCM萃取、分液。将萃取后的DCM溶液合并后,用饱和食盐水洗涤并使用MgSO4干燥。旋转蒸发除去DCM溶剂后,得到粗产物,使用二氯甲烷:石油醚=1:5的洗脱液,通过柱色谱法纯化该粗产物,旋转蒸发后得到淡黄色固体,通过核磁氢谱以及核磁碳谱的表征数据,确定该淡黄色固体即是V型芴基热活化延迟荧光材料(1.02g,产率:84.3%)。
请参阅图1所示,V型芴基热活化延迟荧光材料的核磁氢谱数据如下:
1H NMR(400MHz,Chloroform-d)δ8.99–8.92(m,2H),8.85–8.80(m,4H),7.89(d,J=1.9Hz,2H),7.80(d,J=7.5Hz,4H),7.76–7.70(m,2H),7.67–7.59(m,6H),7.47(d,J=7.7Hz,4H),7.38(td,J=7.6,1.2Hz,6H),7.33–7.29(m,3H),7.28–7.23(m,3H),7.22–7.14(m,4H),6.83–6.73(m,4H),3.92(t,J=6.5Hz,4H),1.77(p,J=6.6Hz,4H),1.44(d,J=8.1Hz,4H).
请参阅图2所示,V型芴基热活化延迟荧光材料的核磁碳谱数据如下:
13C NMR(101MHz,CDCl3)δ171.80,170.92,157.94,152.21,141.63,139.99,139.62,138.34,138.22,136.15,134.75,132.66,130.55,129.16,129.03,128.72,127.73,127.32,126.81,126.42,126.25,123.66,120.19,119.87,114.16,109.62,77.37,77.05,76.73,67.93,64.96,31.85,29.41,29.36,29.28,26.13,22.69,14.13,1.06,0.03.
当制备L型、U1型和U2型芴基热活化延迟荧光材料时,L型、U1型和U2型芴基热活化延迟荧光材料的反应路线通式为:
S1:制备烷芳基芴单元,本实施例中,烷芳基芴单元分别为材料1、材料2和材料3。
制备材料1:
向反应瓶中加入2-溴9-芴酮(0.78g,3.00mmol)、辛氧基苯(1.85g,9.00mmol),密封、抽真空、充氮气。用注射器向反应瓶中加入CH3SO3H(6.00mg,6.00mL),将反应温度升高至80℃,在80℃的条件下搅拌反应12h,反应完成后,向反应液中加入碳酸氢钠水溶液以淬灭该反应。水相用二氯甲烷萃取,将萃取后的有机相合并后干燥,旋转蒸发除去溶剂得到粗产物,使用二氯甲烷:石油醚=1:8的洗脱液,通过柱层析进一步分离纯化该粗产物,得到无色透明液体,通过核磁氢谱的表征数据,确定该无色透明液体即为材料1(0.72g,产率:56.6%)。
材料1的核磁氢谱表征数据为:
1H NMR(400MHz,Chloroform-d)δ7.76–7.70(m,1H),7.62(dd,J=8.0,0.5Hz,1H),7.51(dd,J=1.8,0.5Hz,1H),7.48(dd,J=8.0,1.8Hz,1H),7.39–7.33(m,2H),7.30(dd,J=7.4,1.3Hz,1H),7.13–7.05(m,4H),6.81–6.74(m,4H),3.91(t,J=6.5Hz,4H),1.80–1.72(m,4H),1.43(q,J=6.9,6.3Hz,5H).
制备材料2:
向混有9-苯基-咔唑(1.80g,7.50mmol)和BF3·Et2O(1.40g,1.42mL)的无水DCM(100mL)中,缓慢滴加50mL溶解有2-溴-9-(4-(辛氧基)苯基)-9-芴醇(2.30g,5.00mmol)的无水DCM。将反应液在室温下搅拌3小时后。向反应液中加入水(100mL),用以淬灭该反应。淬灭完成后,水相用DCM萃取,将萃取后的DCM溶液合并后使用饱和食盐水洗涤并使用MgSO4干燥。旋转蒸发除去溶剂后得到粗产物,使用二氯甲烷:石油醚=1:8的洗脱液,通过柱色谱法纯化该粗产物,旋转蒸发后得到白色固体,通过核磁氢谱的表征数据,确定该白色固体即为材料2(2.43g,产率:69.5%)。
材料2的核磁氢谱表征数据为:
1H NMR(400MHz,Chloroform-d)δ8.00(dt,J=7.8,1.0Hz,1H),7.92(dd,J=1.9,0.7Hz,1H),7.81–7.76(m,1H),7.67(d,J=8.1Hz,1H),7.62–7.53(m,5H),7.50(dd,J=8.1,1.8Hz,1H),7.49–7.43(m,2H),7.41–7.36(m,3H),7.34–7.29(m,2H),7.27–7.21(m,2H),7.21–7.16(m,2H),6.83–6.77(m,2H),3.94(t,J=6.5Hz,2H),1.83–1.72(m,2H),1.44(q,J=7.2Hz,2H).
制备材料3:
向混有9-(4-(4,6-二苯基-1,3,5-三嗪-2-基)苯基)-9H-咔唑(CzTrz,1.42g,3.00mmol)和BF3·Et2O(0.60g,0.60mL)的无水DCM(100mL)中,缓慢滴加50mL溶解有2-溴-9-(4-(辛氧基)苯基)-9-芴醇(0.93g,2.00mmol)的无水DCM。将混合物在室温下搅拌3小时。向混合物中加入水(100mL),用以淬灭该反应。淬灭完成后,水相用DCM萃取,将萃取后的有机层合并后,使用饱和食盐水洗涤并经MgSO4干燥后。旋转蒸发除去溶剂得到粗产物,使用二氯甲烷:石油醚=1:5的洗脱液,通过柱色谱法纯化该粗产物,旋转蒸发后得到淡黄色固体,通过核磁氢谱的表征数据,确定该淡黄色固体即是材料3(1.16g,产率:63.2%)。
材料3的核磁氢谱表征数据为:
1H NMR(400MHz,Chloroform-d)δ9.05–8.99(m,2H),8.87–8.81(m,4H),8.03(dd,J=7.9,1.2Hz,1H),7.95(d,J=1.8Hz,1H),7.83–7.76(m,3H),7.70–7.60(m,8H),7.57–7.47(m,3H),7.47–7.38(m,3H),7.37–7.29(m,3H),7.23–7.18(m,2H),6.85–6.79(m,2H),3.94(t,J=6.5Hz,2H),1.78(p,J=6.7Hz,2H),1.50–1.41(m,3H).
S2:制备电子给/受体单元,本实施例中,电子给/受体单元为材料6,而合成材料6则需要先合成材料4以及材料5。
制备材料4:
向混有3-溴咔唑(1.80g,7.50mmol)和BF3·Et2O(1.40g,1.40mL)的无水DCM(50mL)中,缓慢滴加50mL溶解有9-(4-(辛氧基)苯基)-9-芴醇(1.90g,5.00mmol)的无水DCM。将反应混合物在室温下搅拌3小时。向混合物中加入水(100mL)以淬灭反应。淬灭完成后,水相用DCM萃取。将萃取后的DCM溶液合并后,用饱和食盐水洗涤并经MgSO4干燥。旋转蒸发除去溶剂后,得到粗产物,使用二氯甲烷:石油醚=1:3的洗脱液,通过柱色谱法纯化粗产物,旋转蒸发后得到白色固体,通过核磁氢谱的表征数据,确定该白色固体即是材料4(2.68g,产率:86.3%)。
材料4的核磁氢谱表征数据为:
1H NMR(400MHz,Chloroform-d)δ8.05–7.99(m,2H),7.81(dt,J=7.3,1.0Hz,3H),7.50–7.43(m,3H),7.39(td,J=7.5,1.1Hz,2H),7.35–7.29(m,4H),7.28–7.25(m,1H),7.22–7.16(m,2H),6.83–6.74(m,2H),3.93(t,J=6.5Hz,2H),1.84–1.69(m,2H),1.44(d,J=9.0Hz,2H).
制备材料5:
将FTrz(1.00g,3.00mmol)、材料4(1.50g,2.50mmol)、K2CO3(2.50g,12.50mmol)依次加入反应瓶中,将装置密封。将装置抽真空3-4次(换气N2),将装置放到油浴锅中,并将DMF注入反应瓶中,体系在150℃的条件下搅拌反应12小时左右,停止反应。向反应液中加水以淬灭该反应,抽滤除去混合溶剂,柱层析使用二氯甲烷:石油醚=1:5的洗脱液,通过柱层析分离纯化,旋转蒸发后得到淡黄色化合物,通过核磁氢谱的表征数据,确定该淡黄色化合物即是材料5(6.5g,产率:74.7%)。
材料5的核磁氢谱表征数据为:
1H NMR(400MHz,Chloroform-d)δ9.01(d,J=8.3Hz,2H),8.87–8.79(m,4H),8.11(d,J=1.9Hz,1H),7.91(d,J=1.6Hz,1H),7.83(d,J=7.5Hz,2H),7.75(d,J=8.4Hz,2H),7.69–7.60(m,6H),7.53–7.47(m,3H),7.44–7.36(m,6H),7.33(t,J=7.4Hz,2H),7.22(d,J=8.7Hz,2H),6.81(d,J=8.6Hz,2H),3.93(t,J=6.5Hz,2H),1.77(p,J=6.8Hz,2H),1.45(s,3H).
制备材料6:
向100mL反应瓶中依次加入联硼酸频那醇酯(0.76g,3.00mmol)、材料5(1.84g,2.00mmol)和KOAc(0.59mg,6.00mmol),密封、抽真空、充氮气。在氮气的环境中快速加入Pd(DPPF)Cl2(0.07g,0.10mmol),再次抽真空、充氮气。向反应瓶中加入1,4-二氧六环(60mL)溶剂,并用锡纸避光,将反应温度升高至110℃,搅拌反应24h左右,使用薄层层析监测原料基本反应完全后,加水猝灭该反应。水相用二氯甲烷萃取,收集萃取后的有机相,旋转蒸发除去溶剂后得到粗产物,使用二氯甲烷:石油醚=1:4的洗脱液,通过柱层析分离纯化,旋转蒸发后得到黄色固体粉末,通过核磁氢谱的表征数据,确定该黄色固体粉末即是材料6(1.53g,产率:78.8%)。
材料6的核磁氢谱表征数据为:
1H NMR(400MHz,Chloroform-d)δ9.01(d,J=8.5Hz,2H),8.89–8.80(m,4H),8.48(s,1H),8.09(d,J=1.8Hz,1H),7.89(dd,J=8.3,1.1Hz,1H),7.83(d,J=7.6Hz,2H),7.78(d,J=8.5Hz,2H),7.69–7.59(m,6H),7.51(d,J=7.9Hz,3H),7.43–7.36(m,3H),7.32(td,J=7.4,1.2Hz,3H),7.23(d,J=8.7Hz,2H),6.81(d,J=8.8Hz,2H),3.95(t,J=6.5Hz,2H),1.78(p,J=6.6Hz,2H).
S3:制备L型芴基热活化延迟荧光材料。
向反应瓶中加入材料1(327mg,0.50mmol)和材料6(390mg,0.4mmol),密封、抽真空、充氮气。在氮气的环境中快速加入Pd(PPh3)4(30mg,0.02mmol),再次抽真空、充氮气。向反应瓶中加入甲苯和四氢呋喃混合溶剂(30mL,甲苯:四氢呋喃=1:1)、2mol的K2CO3和KF水溶液(5mL)。使用锡纸避光,将反应温度升高至90℃,搅拌反应24h,使用薄层层析监测原料基本反应完全,加水猝灭该反应。水相使用二氯甲烷萃取,收集萃取后的有机相,旋转蒸发除去溶剂,并用二氯甲烷:石油醚=1:4的洗脱液,通过柱层析分离纯化,旋转蒸发后得到黄色固体粉末,通过核磁氢谱以及核磁碳谱的表征数据,确定该黄色固体粉末即是L型芴基热活化延迟荧光材料(383mg,产率:67.7%)。
请参阅图3所示,L型芴基热活化延迟荧光材料的核磁氢谱表征数据为:
1H NMR(400MHz,Chloroform-d)δ9.02(d,J=8.5Hz,2H),8.88–8.79(m,4H),8.15(d,J=1.7Hz,1H),7.99(d,J=1.8Hz,1H),7.87–7.77(m,6H),7.72–7.59(m,9H),7.57–7.51(m,3H),7.48–7.29(m,9H),7.25–7.16(m,6H),6.84–6.73(m,6H),3.92(q,J=6.8Hz,6H),1.77(q,J=7.0Hz,6H).
请参阅图4所示,L型芴基热活化延迟荧光材料的核磁碳谱表征数据为:
13C NMR(101MHz,CDCl3)δ171.82,170.92,157.98,153.01,152.55,152.12,141.59,141.40,141.17,140.07,140.04,139.87,139.76,139.70,138.70,138.61,138.37,138.28,137.92,137.79,136.16,134.84,134.15,132.68,130.64,129.83,129.40,129.25,129.05,128.73,127.80,127.59,127.40,127.08,127.00,126.85,126.75,126.41,126.26,125.85,125.07,124.25,123.72,123.42,123.17,120.47,120.23,119.82,119.68,119.58,118.99,114.18,110.09,109.85,109.71,109.65,77.38,77.07,76.75,67.94,65.10,64.96,31.86,29.41,29.37,29.28,26.15,26.13,22.69,14.15,1.08,0.05.
S4:制备U1型芴基热活化延迟荧光材料。
合成方法同S3,将S3中的材料1更换为材料2(345mg,0.50mmol),其他投料量、反应条件以及处理方法不变,得到淡黄色固体粉末,通过核磁氢谱以及核磁碳谱的表征数据,确定该淡黄色固体粉末即是U1型芴基热活化延迟荧光材料(424mg,产率:72.9%)。
请参阅图5所示,U1型芴基热活化延迟荧光材料的核磁氢谱表征数据为:
1H NMR(400MHz,Chloroform-d)δ9.03–8.97(m,2H),8.87–8.80(m,4H),8.17(d,J=1.7Hz,1H),8.05–7.97(m,3H),7.87(dd,J=13.7,7.7Hz,2H),7.83–7.76(m,5H),7.73(dd,J=7.9,1.6Hz,1H),7.69–7.48(m,16H),7.47–7.29(m,14H),7.28(d,J=1.2Hz,1H),7.22(dd,J=8.2,5.5Hz,3H),6.80(dd,J=8.9,7.6Hz,4H),3.93(q,J=7.0Hz,4H),1.76(p,J=7.5Hz,4H).
请参阅图6所示,U1型芴基热活化延迟荧光材料的核磁碳谱表征数据为:
13C NMR(101MHz,CDCl3)δ171.83,170.93,157.98,157.92,152.67,152.14,152.11,141.58,141.33,140.06,139.79,139.70,138.63,138.59,138.27,137.98,136.15,134.87,134.11,132.69,130.65,129.25,129.04,128.73,127.81,127.42,127.32,127.12,126.68,126.43,126.26,126.11,125.76,124.90,124.26,123.67,120.36,120.24,120.12,119.64,119.01,114.17,114.11,110.07,109.86,77.36,77.04,76.73,67.93,67.91,64.95,64.33,31.83,29.73,29.39,29.36,29.26,26.12,22.67,14.12,1.06,0.03.
S5:制备U2型芴基热活化延迟荧光材料。
合成方法同S3,将S3中的材料1更换为材料3(461mg,0.50mmol),其他投料量、反应条件以及处理方法不变,得到淡黄色固体粉末,通过核磁氢谱以及核磁碳谱的表征数据,确定该淡黄色固体粉末即是U2型芴基热活化延迟荧光材料(406mg,产率:60.3%)。
请参阅图7所示,U2型芴基热活化延迟荧光材料的核磁氢谱表征数据为:
1H NMR(400MHz,Chloroform-d)δ9.00(dd,J=8.6,3.2Hz,4H),8.86–8.79(m,8H),8.18(d,J=1.7Hz,1H),8.08–7.98(m,3H),7.88(dd,J=13.2,7.7Hz,2H),7.79(dd,J=8.5,5.7Hz,7H),7.75–7.72(m,1H),7.67–7.58(m,13H),7.53(td,J=8.0,4.2Hz,5H),7.47–7.29(m,13H),7.26(d,J=7.2Hz,1H),7.21(d,J=8.8Hz,2H),6.81(dd,J=15.5,8.8Hz,4H),3.93(dt,J=15.4,6.5Hz,4H),1.77(dt,J=15.1,7.7Hz,4H).
请参阅图8所示,U2型芴基热活化延迟荧光材料的核磁碳谱表征数据为:
13C NMR(101MHz,CDCl3)δ171.80,170.93,170.90,158.03,157.98,152.92,152.45,152.11,141.69,141.57,141.45,140.71,140.08,140.03,139.88,139.70,139.29,138.70,138.61,138.54,138.27,136.15,134.84,134.81,134.13,132.66,130.62,129.40,129.24,129.03,128.71,127.79,127.62,127.40,127.07,126.80,126.53,126.41,126.24,126.10,125.85,125.07,124.24,123.85,123.72,123.63,120.63,120.49,120.35,120.23,119.70,119.00,114.23,114.17,110.10,109.85,77.37,77.06,76.74,67.92,65.11,64.95,31.84,29.41,29.39,29.35,29.28,29.26,26.15,26.11,22.68,14.13,1.07,0.04.
需要说明的是:为了描述方便,本发明对L型、U1型和U2型芴基热活化延迟荧光材料的制备步骤进行了S1、S2、S3、S4以及S5的划分,但是在实际的制备过程中,步骤S1、S2没有前后顺序的限制,步骤S3-S5也没有前后顺序的限制,本领域技术人员可以根据实际情况对L型、U1型以及U2型芴基热活化延迟荧光材料的制备顺序进行调整,此处不作任何限制。
请参阅图9所示,本发明还提供了一种有机电致发光器件,将前述芴基热活化延迟荧光材料用于构筑有机电致发光器件的发光层,该有机电致发光器件包括:ITO阳极层、空穴注入层、发光层、电子传输层、电子注入层和阴极层。器件制备方法如下:首先用去污剂和去离子水反复清洗ITO玻璃基板,接着依次用乙醇和丙酮分别超声处理20分钟,而后将其暴露在UV-O3照射10分钟,得到ITO阳极层。将PEDOT:PSS溶液旋涂在清洁的ITO玻璃基板上,在120℃下退火20分钟,以将空穴注入层覆盖在ITO阳极层上。在氮气流中冷却5分钟后,将TADF(V型、L型、U1型和U2型芴基热活化延迟荧光材料)溶解在10mg/mL的氯苯溶液中,继续以2000rpm的转速旋涂30秒以形成40nm厚的发光层,并在90℃下退火20分钟以去除残留溶剂,随后在一定压力(<10-4Pa)下,将电子传输层(TmPyPb)、电子注入层(LiF)和阴极层(Al)按顺序沉积到基板上,得到含有芴基热活化延迟荧光材料的有机电致发光器件,该有机电致发光器件从下往上的结构依次为:ITO、PEDOT:PSS、TADF、TmPyPb、LiF和Al。
对上述制备的有机电致发光器件进行如下性能测定:在同样亮度下,使用数字源表及亮度计测定器件的开启电压、最大亮度并计算出最大的外量子效率。具体是以每秒0.1V的速率提升电压,测定当亮度达到1cd/m2是的电压即开启电压,同时测出此时的电流密度并依据光谱等数据计算出最大的外量子效率,测试结果如下表所示。
从表中可以看出,采用本发明的芴基热活化延迟荧光材料作为有机电致发光器件的TADF发光材料时,有机电致发光器件性能表现优异,具有较低的开启电压,最大亮度均超过10000cd/m2,最大外量子效率均超过5%。
综上所述,本发明提供了一种芴基热活化延迟荧光材料,通过Suzuki反应制备得到,该反应具有条件温和、操作简单和成本低的优点;同时,芴基热活化延迟荧光材料的成膜性好,可以采用溶液法制备,便于大规模的应用;进一步的,芴基热活化延迟荧光材料可作为发光材料应用于有机电致发光器件中,使有机电致发光材料具有电流效率高、功率效率高、工作电压低和发光寿命长等优点。
以上实施例仅用以说明本发明的技术方案而非限制,尽管参照较佳实施例对本发明进行了详细说明,本领域的普通技术人员应当理解,可以对本发明的技术方案进行修改或者等同替换,而不脱离本发明技术方案的精神和范围。
Claims (5)
4.一种有机电致发光器件,其特征在于:包括自下而上层叠设置的ITO层、空穴注入层、发光层、电子传输层、电子注入层及阴极层,所述发光层为权利要求1或2所述的芴基热活化延迟荧光材料。
5.根据权利要求4所述的有机电致发光器件,其特征在于:所述ITO层为ITO玻璃基板,所述空穴注入层为PEDOT:PSS,所述电子传输层为TmPyPb,所述电子注入层为LiF,所述阴极层为Al。
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