CN113416214A - 一种聚集诱导发光材料及其制备方法 - Google Patents
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Abstract
本发明涉及光电显示器件技术领域,具体涉及一种聚集诱导发光材料及其制备方法。本发明提供了一种聚集诱导发光材料,其结构式如式(I)所示:本发明一种聚集诱导发光材料的制备方法,包括将式(II)所示化合物与(4‑溴苯基)二苯基氧化膦通过Suzuki偶联反应制得式(I)所示化合物;本发明提供了一种聚集诱导发光材料及其制备方法,解决了现有的有机发光材料性能不佳,且易产生聚集淬灭发光效应的技术问题。
Description
技术领域
本发明涉及光电显示器件技术领域,具体涉及一种聚集诱导发光材料及其 制备方法。
背景技术
在传统有机发光材料中,荧光材料的OLED性能稳定,但是效率比较低。 第二代有机磷光材料OLED器件效率较高,但是成本较大、污染环境和器件滚降 严重,很大程度上限制了OLED器件的发展。且有机发光材料大多具有共轭平面 结构,在稀溶液中,具有较强的发光性能,在聚集状态下却较易发生π-π堆积, 从而导致ACQ效应。
发明内容
本发明提供了一种聚集诱导发光材料及其制备方法,解决了现有的有机发 光材料性能不佳,且易产生聚集淬灭发光效应的技术问题。
本发明提供了一种聚集诱导发光材料,其结构式如式(I)所示:
本发明一种聚集诱导发光材料的制备方法,包括将式(II)所示化合物与 (4-溴苯基)二苯基氧化膦通过Suzuki偶联反应制得式(I)所示化合物;
优选的,所述Suzuki偶联反应的时间为24-28h。
本发明的有益效果如下:
本发明实施例成功制备出具有TADF效应的红光化合物。而延迟荧光是指处 于Tn态上的激子反系间窜跃到Sn态上,然后再回到S0态并发光的过程。这样 延迟荧光使Sn态和Tn态上的激子均能够充分利用,从而达到提升OLED效率 的作用,解决了现有的OLED器件效率低下的问题。本发明实施例中最佳电致发 光性能数据为:△EST为0.06eV,启亮电压为2.2V,亮度为14735cd/m2。且当 水含量(fW)超过70%时,发光强度迅速提升,具有典型的AIE效应。
附图说明
图1为本发明实施例的PL光谱;
图2为本发明实施例的外量子效率-亮度曲线图;
图3为本发明实施例的电流密度-电压-亮度曲线
图4为本发明实施例5在不同水含量的THF/水混合液中的荧光光谱;
图5为本发明实施例5制得的化合物在不同水含量的THF/水混合液中的荧 光光谱。
具体实施方式
下面结合具体实施例对本发明做进一步详细说明,但实施例并不对本发明 做任何形式的限定。除非特别说明,本发明采用的试剂、方法和设备为本技术 领域常规试剂、方法和设备。
实施例1
将三苯基氧化膦(5.56g,20mmol)溶解在50mlDMF中,并将液溴(4.78g, 30mmol),在0℃下搅拌12h,将得到产物在乙醇中重结晶得到产物(4-溴苯基) 二苯基氧化膦(5.36g,产率75%),其化学反应方程式为:
实施例2
向250mL三口烧瓶中加入式(III)所示化合物(5.45g,10mmol),异丙醇 频哪醇硼酸酯(2.14ml,10mmol)、100ml无水四氢呋喃和丁基锂(40mmol), 向其中通入氩气30min并干燥。氩气保护下向三口烧瓶中加入50mLK2CO3水溶 液,然后在0℃下保持30min后滴加丁基锂(0.35mL,40mmol)。然后转入-78℃ 条件中保持30min,在氩气的保护下搅拌反应10h。在0℃条件下加入1mL甲 醇淬灭反应。并用盐水溶液,水洗涤,用无水Na2SO4干燥,过滤,并真空除去 溶剂,旋干得粗品。经正己烷洗涤处理后得到式(II)所示化合物(6.49g,产 率81%),其化学反应方程式为:
实施例3
在氩气气氛下,向150ml的三口反应瓶内依次加入式(II)所示化合物 (8.01g,10mmol),(4-溴苯基)二苯基氧化膦(4.82g,10mmol),Pd(PPh3)4 (0.58g,0.5mmol),TBAB(0.16g,0.5mmol),溶剂80ml甲苯,15分钟后加 入50wt%的K2CO3水溶液,反应24h。待反应结束后,分离有机相,浓缩。粗产品 通过柱层析的方式提纯,PE/DCM为4/1(体积比)作为淋洗剂。最终得到产物 化合物1(6.4g,产率78%),其化学反应方程式为:
实施例4
本实施例与实施例3的区别为:实施例4的反应时间为24h,本实施例的反 应时间为26h,最终制得化合物2(5.9g,产率62%)。
实施例5
本实施例与实施例3的区别为:实施例4的反应时间为24h,本实施例的反 应时间为28h,最终制得化合物3(6.0g,产率63%)。
图1为本发明实施例3-5的PL光谱,本发明采用HIACHI F-7000荧光分光 光度计测定其PL光谱,由图1可知,本发明实施例制得的化合物的发光波长均 位于600-630nm之间,为红光区域,表明本发明成功制备出长波长发射化合物。
图2为本发明实施例制得的化合物的外量子效率-亮度曲线,本发明采用计 算机集成控制的BM-7A型光度计和Keithley2400数字源表测定电流-电压-亮度 的数据,并通过电压-电流-亮度的数据计算得到EQE数值,由图2可知,本发 明实施例制得的化合物1-3的外量子效率依次为16.5%,17.8%,18.6%,均超过 了15%,而通常荧光材料在不具备反系间窜跃特性时,其外量子效率大多低于5%,表明本发明实施例制得的化合物具有延迟发光效应。
图3为本发明实施例的瞬态PL光谱曲线,本发明实施例采用稳态瞬态荧光 /磷光光谱仪FLS920测定其瞬态PL光谱曲线,由图可知,本发明实施例均具有 延迟部分和瞬态部分,具有典型的TADF效应。
本发明以PEDOT:PSS为空穴注入层,NPB作为空穴传输层(HTL),以制得 的化合物作为发光层(EML),TPBi作为电子传输层(ETL),制备器件 ITO/PEDOT:PSS(40nm)/NPB(60nm)/EML(20nm)/TPBi(40nm)/LiF(1.5nm)/Al(100 nm),图4为本发明实施例的电流密度-电压-亮度曲线,其中,本发明实施例的 电致发光性能数据具体如表1所示。
表1本发明实施例3-5制得化合物的电致发光性能数据
实施例 | PL | S<sub>1</sub>(eV) | T<sub>1</sub>(eV)) | △E<sub>ST</sub>(eV) | V<sub>on</sub> | L(cd/m<sup>2</sup>) |
实施例3 | 612 | 2.96 | 2.79 | 0.17 | 2.8 | 2978 |
实施例4 | 618 | 2.89 | 2.79 | 0.10 | 2.4 | 4265 |
实施例5 | 621 | 2.87 | 2.81 | 0.06 | 2.2 | 14735 |
由表1可知,本发明实施例的△EST远小于0.2eV,且具有较低的启亮电压 和较高的亮度,且化合物都位于红光区域,其中,本发明实施例中最佳电致发 光性能数据为:△EST为0.06eV,启亮电压为2.2V,亮度为14735cd/m2。
图5为本发明实施例5制得的化合物在不同水含量的THF/水混合液中的荧 光光谱,由图5可知,当水含量(fW)超过70%时,发光强度迅速提升,可归因 于随着水体积含量百分比的增多,化合物的溶解度逐渐降低,分子逐渐成为聚 集状态,其荧光也随之增强,具有典型的AIE效应。
上述实施例为本发明较佳的实施方式,但本发明的实施方式并不受上述实 施例的限制,其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、 替代、组合、简化,均应为等效的置换方式,都包含在本发明的保护范围之内。
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