CN107759624B - 不对称芳基硼有机光电功能材料及其制备方法与应用 - Google Patents
不对称芳基硼有机光电功能材料及其制备方法与应用 Download PDFInfo
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Abstract
一种不对称芳基硼有机光电功能材料及其制备方法与应用,该材料是以芳基硼化合物作为受体,以苯基咔唑、三苯胺、苯基吩噁嗪、苯基吩噻嗪或苯基吖啶作为给体,经Suzukit偶联反应制得。该类材料易于纯化,合成较简单、具有较好的溶解性、稳定性以及成膜性并且具有较高的三线态能级;通过引入芳基硼基团可以明显的改善材料的载流子传输能力,赋予其优异的空穴传输和电子传输能力,是一种具有双极传输性质的新型高性能光电功能材料;利用本发明材料制备的电致发光器件,具有高效率、较低的启亮电压以及稳定的电致发光性能,本发明对发展高效稳定的有机发光二极管具有重要意义。
Description
技术领域
本发明涉及有机光电材料技术领域,具体涉及一种新型不对称芳基硼化合物光电功能材料及其制备方法与应用。
背景技术
有机电致发光二极管(Organic light-emitting diodes,OLEDs)是在电场的作用下,以有机材料为活性层发光的器件。由于OLED具有视角宽,高亮度,响应快,工艺简单等优点,在现代科学研究中受到了广泛的关注。在电致发光(EL)中,由电子和空穴的复合而激发的有机分子,不受自旋规律的限制,理论上按照统计分布计算,产生激发三重态和激发单重态的比例是3:1。因此在电致发光中如果不考虑其它可能的能量损失,荧光电致发光只利用了输入能量的25%,这就导致其内量子效率(指辐射光子数占注入载流子数的比例)很难突破25%的理论极限,而其余处于激发三重态(75%)的能量并没有被利用,所以如何将激发三重态的能量转换为光的形式释放出来,提升器件的量子效率,是最近的研究热点之一。有机电致磷光器件 (Phosphorescent organic light-emitting diodes,PhOLEDs),由于在磷光材料中引入重原子,提高了自旋和轨道的耦合,缩短了磷光材料的寿命,使原来自旋禁阻的最低激发三重态到单重态的跃迁变为允许,因此75%的三重态的激子就可以被利用,这样其内量子效率理论上就有可能会达到100%。但是在PhOLEDs中,当激发三重态的浓度过高时,常常会出现三重态—三重态湮灭和高浓度的猝灭,这种现象的出现会使器件效率降低,为了避免这种现象的出现,常常采用主客体掺杂结构。为了获得高效的电致磷光器件,主体材料的发展是非常重要的。一个较好的主体材料必须满足以下几个条件:1)主体材料分子中有较大的吸收截面;2)主体材料与客体材料有良好的相容性,防止相分离从而导致浓度猝灭;3)主体材料需要有较高的三线态能级,可以防止能量从客体材料回传到主体材料;4)主体材料的发射光谱与客体材料的吸收光谱有一定的重叠,这样主体材料受到激发后,能量可以顺利的传递给客体分子;5) 主体材料的最高占有轨道(HOMO)和最低未占有轨道(LUMO)应该与相邻活性层匹配,这样可以减少空穴和电子的注入阻力,从而降低驱动电压;6)较好的载流子迁移率;7)较好的热稳定性和化学稳定性。
但是,目前旋涂型的磷光有机发光二极管仍然存在效率低下,器件寿命较短的问题,尤其是蓝光器件,所以通过开发新型的蓝光双极性主体材料来改善器件性能是非常重要的。
发明内容
针对现有技术的不足,本发明的目的是提供一种新型不对称芳基硼化合物光电功能材料及其制备方法与应用。该材料具有良好的光电性能、稳定性、成膜性、溶解性等优点,该制备方法以成本低廉的芳基硼化合物作为受体基团,原材料成本低,制备方法简单高效。
为实现上述目的,具体技术方案如下:
一种新型不对称芳基硼有机光电功能材料,结构式如式1所示:
R1和R2为具有不同给电子能力的给体:苯基咔唑、三苯胺、苯基吩噁嗪、苯基吩噻嗪或苯基吖啶。
作为本申请的优选技术方案,所述的R1和R2为如下所述结构化合物中的任一种,其中, B为硼原子,N为氮原子,O为氧原子,S为硫原子。
具体的,所述的基新型不对称芳基硼有机光电功能材料可以是以下结构中的任一种:
一种新型不对称芳基硼有机光电功能材料的制备方法,包括如下步骤:
(1)将1,2,4,5,-四甲苯溶于二氯甲烷中,缓慢滴加液溴,控制温度在50-70℃反应,然后向反应体系滴加碱性溶液至反应体系为中性,过滤得到固体;
(2)在氮气保护下,将步骤(1)得到的产物溶解于干燥的无水乙醚中,将反应体系降至-78℃,再滴加正丁基锂反应1h,保持温度加入三氟化硼-乙醚络合物,升至室温反应12h,经萃取,旋蒸得到粗产物分离提纯得到固体;
(3)在氮气保护下,将步骤(2)得到的产物通过Suzuki偶联反应与给电子单元(Ⅰ-Ⅴ)相连接,得到新型不对称芳基硼有机光电功能材料。
作为本申请的一种优选技术方案,所述步骤(1)中,反应时间在1-3h。
作为本申请的一种优选技术方案,所述步骤(2)中,滴加操作时,步骤(1)所得产物与丁基锂的摩尔比为1:1,步骤(1)所得产物与乙醚的体积比为1mmol:10-12mL,步骤(1) 所得产物与三氟化硼乙醚络合物的摩尔比为3:1。
作为本申请的一种优选技术方案,所述步骤(3)中,Suzuki偶联反应的温度为80-90℃,反应时间为24-48h。
本发明所述的基于新型不对称芳基硼有机光电功能材料的电致发光器件。
本发明所述的基于新型不对称芳基硼有机光电功能材料在有机光电器件中的应用。
与现有技术相比,本发明具有如下有益效果:
(1)本发明中涉及的不对称含硼化合物的光电功能材料,合成较为简单且产率较高;
(2)这种功能材料是利用原子级别的受体构筑双极性主体材料,并且碳硼键之间的非共轭连接方式保证了材料具有较高的三线态能级,可以很好的抑制能量从客体材料回传到主体材料;
(3)具有较好的热稳定性,热分解温度都在330℃以上;
(4)发射光谱可以很好的和客体材料的吸收光谱重合,有利于能量传递,并且有着合适的 HOMO和LUMO值;
(5)制作的电致发光器件有着较低的启动电压(3.5V左右),和高的外量子效率(18%),有助于实现高效稳定的电致发光器件。
附图说明
图1为实施例2和实施例3中的DNPhCzB和NPhDCzB在二氯甲烷和薄膜状态下的紫外吸收(UV)光谱和荧光发射(PL)光谱;
图2为实施例2和实施例3的DNPhCzB和NPhDCzB电致发光器件的电流密度-电压-亮度曲线;
图3为实施例2和实施例3的DNPhCzB和NPhDCzB电致发光器件效率图。
具体实施方式
下面通过具体实施方式对本发明作进一步详细说明。但本领域技术人员将会理解,下列实施例仅用于说明本发明,而不应视为限定本发明的范围。实施例中未注明具体技术或条件者,按照本领域内的文献所描述的技术或条件或者按照产品说明书进行。所用试剂或仪器未注明生产厂商者,均为可以通过市购获得的常规产品。
实施例1:光电功能材料TPhB的合成
取单口反应瓶,加入10g 1,2,4,5-四甲基苯,加入30mL二氯甲烷,取恒压滴液漏斗置于单口瓶上方,量取10mL液溴,并加入30mL二氯甲烷置于恒压滴液漏斗中,接尾气回收装置,逐滴将液溴的二氯甲烷溶液滴加入反应体系中,滴加完毕后,恒压滴液漏斗移除,并在单口瓶上接上冷凝管,将反应体系升至55℃,反应1.5h。反应结束后将体系将至室温,向反应体系中滴加氢氧化钾水溶液至反应体系呈中性,将固体过滤并干燥。将部分粗产物(4.6g)加入两口瓶中,抽真空,鼓氮气反复三次,氮气保护下加入150mL的无水乙醚,然后将装置放入到-78℃的干冰/丙酮浴中冷却10min。用注射器量取6.3mL的正丁基锂的正己烷溶液,逐滴加入到反应瓶中,氮气保护下-78℃反应1h,然后加入三氟化硼-乙醚络合物0.66mL,然后室温反应12h。反应液用100mL的水猝灭反应,用3×50mL的二氯甲烷溶液萃取,有机相收集并用无水硫酸钠干燥,浓缩得粗产物,经柱层析分离纯化得到2.8g白色固体,产率82.3%。结构如下:
实施例2:光电功能材料DNPhCzB的合成
取干净两口瓶称取TPhB(0.8g),4-硼酸酯苯基咔唑(0.45g),四三苯基膦钯(0.32g),相转移催化剂1mL,抽真空,鼓氮气反复三次,氮气保护下加入去除氧气的甲苯(30mL),2M的碳酸钾水溶液(15mL),将反应体系的温度升高至85℃,反应48h。反应液用50mL的水猝灭反应,用3×40mL的二氯甲烷溶液萃取,有机相收集并用无水硫酸钠干燥,浓缩得到粗产物,经硅胶层析柱分离纯化得到的0.3g白色固体产物(CzBDBr),产率48%。
取干净两口瓶称取CzBDBr(0.3g),4-硼酸三苯胺(0.63g),四三苯基膦钯(0.108g),相转移催化剂0.6mL,抽真空,鼓氮气反复三次,氮气保护下加入去除氧气的甲苯(24mL),2M的碳酸钾水溶液(12mL),将反应体系的温度升高至85℃,反应48h。反应液用50mL的水猝灭反应,用3×40mL的二氯甲烷溶液萃取,有机相收集并用无水硫酸钠干燥,浓缩得到粗产物,经硅胶层析柱分离纯化得到的0.2g白色固体产物(DNPhCzB)。产率:48%。1H NMR(400MHz, d-DMSO,ppm):δ.25(s,2H),7.67(s,2H),7.45-7.30(m,16H),7.07-7.01(t,J=24Hz,20H),2.07 (s,18H),1.93(d,J=20Hz,18H).13C NMR(100MHz,CDCl3,ppm):δ149.37,148.85,148.02, 145.83,142.88,142.82,142.20,141.03,137.88,135.95,135.81,135.74,131.52,131.24,131.05, 130.40,129.24,126.80,125.92,124.14,123.86,123.40,122.58,120.34,119.89,109.90,20.33, 18.10.HRMS(EI):m/z calcd forC84H76BN3[M+H]+:1137.6247;found:1137.6246.
结构如下:
实施例3:光电功能材料NPhDCzB的合成
取干净两口瓶称取TPhB(0.8g),4-硼酸酯苯基咔唑(0.9g),四三苯基膦钯(0.32g),相转移催化剂1mL,抽真空,鼓氮气反复三次,氮气保护下加入去除氧气的甲苯(30mL),2M的碳酸钾水溶液(15mL),将反应体系的温度升高至85℃,反应48h。反应液用50mL的水猝灭反应,用3×40mL的二氯甲烷溶液萃取,有机相收集并用无水硫酸钠干燥,浓缩得到粗产物,经硅胶层析柱分离纯化得到的0.3g白色固体产物(DCzBBr),产率48%。
取干净两口瓶称取DCzBBr(0.3g),4-硼酸三苯胺(0.32g),四三苯基膦钯(0.11g),相转移催化剂0.3mL,抽真空,鼓氮气反复三次,氮气保护下加入去除氧气的甲苯(24mL),2M的碳酸钾水溶液(12mL),将反应体系的温度升高至85℃,反应48h。反应液用50mL的水猝灭反应,用3×40mL的二氯甲烷溶液萃取,有机相收集并用无水硫酸钠干燥,浓缩得到粗产物,经硅胶层析柱分离纯化得到的0.2g白色固体产物(NPhDCzB)。产率:48%。1H NMR(400MHz,d-DMSO,ppm):δ8.27(d,J=8.0Hz,4H),7.70(d,J=8.0Hz,4H),7.46(s,8H),7.40-7.28(m,12H), 7.07-7.02(m,10H),2.09(s,18H),1.95(d,J=24Hz,18H).13C NMR(100MHz,CDCl3,ppm):δ 149.27,148.76,148.00,145.84,142.78,142.28,141.01,137.82,136.00,135.92,135.78,135.72, 131.58,131.30 131.03,130.37,129.23,126.81,125.91,124.13,123.85,123.39,122.58,120.34, 119.88,109.88,20.34,18.12.HRMS(EI):m/z calcd forC84H74BN3[M+H]+:1135.6090;found: 1135.6093.
结构如下:
有机电致发光的性能表征
本发明以配合物作为发光层的器件可包括:1.导电玻璃层(ITO);2.空穴注入层PEDOT:PSS;3.发光层;4.电子传输层(TmPyPB);5.电子注入层(Liq);6.阴极Al。
电致发光器件的制作方法为:使用旋涂技术,在经过清洗的玻璃衬底(ITO)上依次旋涂 ITO/PEDOT:PSS(80nm)/host:15wt%FIrpic(35nm)/TmPyPB(40nm)/Liq(1nm)/Al(100nm),其中Host为实施例2和实施例3中制备得到的DNPhCzB或NPhDCzB和一定比例的TAPC 材料共混。电致发光器件的电流密度-电压-亮度曲线如图2所示。本发明提供的光电材料的电流效率如图3所示。
试验结果如下表所示:
a数据顺序为亮度为1cd m-2,亮度为100cd m-2,亮度为1000cd m-2时的电压值。
b数据顺序为电流效率,功率效率,外量子效率。
c数据顺序为亮度为100cd m-2,亮度为1000cd m-2。
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,其它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。
Claims (3)
2.权利要求1所述的不对称芳基硼有机光电功能材料的制备方法,其特征在于,包括如下步骤:
(1)将1,2,4,5-四甲苯溶于二氯甲烷中,缓慢滴加液溴,控制温度在50-70℃反应1-3h,然后向反应体系滴加碱性溶液至反应体系为中性,过滤得到固体;
(2)在氮气保护下,将步骤(1)得到的产物溶解于干燥的无水乙醚中,将反应体系降至-78℃,再滴加正丁基锂反应1h,保持温度加入三氟化硼-乙醚络合物,升至室温反应12h,经萃取,旋蒸得到粗产物分离提纯得到固体,所述步骤(1)所得产物与正丁基锂的摩尔比为1:1,步骤(1)所得产物与乙醚的体积比为1mmol:10-12mL,步骤(1)所得产物与三氟化硼-乙醚络合物的摩尔比为3:1;
(3)在氮气保护下,将步骤(2)得到的产物通过Suzuki偶联反应与权利要求1中所述的R1、R2对应的给电子单元相连接,得到不对称芳基硼有机光电功能材料,所述Suzuki偶联反应的温度为80-90℃,反应时间为24-48h。
3.权利要求1所述的不对称芳基硼有机光电功能材料在有机电致发光器件主体材料中的应用。
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