CN110669018A - 一种n杂环平面状光耦输出材料及其制备方法 - Google Patents
一种n杂环平面状光耦输出材料及其制备方法 Download PDFInfo
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Abstract
Description
技术领域
本发明涉及光电技术领域,特别是涉及一种光耦输出材料及其制备方法。
背景技术
有机电致发光二极管(organic light-emitting diodes,OLEDs),其具有主动发光不需要背光源、发光效率高、可视角度大、响应速度快、温度适应范围大、生产加工工艺相对简单、驱动电压低,能耗小,更轻更薄,柔性显示等优点,以及巨大的应用前景,吸引了众多研究者的关注。在OLED中,起主导作用的发光客体材料至关重要。
对于目前使用的顶发射器件结构,其微腔效应能够极大地提高器件效率,窄化光谱,拓宽色域。在器件结构中,光耦合输出层材料(Coupling Layer,CPL)所发挥的作用巨大,高折射率(N)的材料不仅能够提高器件效率,同时能够减薄材料的厚度,达到节约材料降低成本的目的。
发明内容
为解决上述技术问题,本发明通过设计基于平面芳香基团连接作为桥连中心,在两端连接其他吸收波段很窄的N杂芳香基团进行排列,设计了一系列棒状CPL材料,提供了改性设的光耦输出材料,通过质谱分析对它们的结构进行确认,然后将这些CPL材料应用到发光层制备了一系列高性能的OLED。
本发明提供了一种N杂环平面状光耦输出材料,所述结构通式为:R1-R2-R1,其中,R1可选自以下结构中任一种,
R2可选自以下结构中任一种,
所述合成的输出材料结构式可选自以下结构中任选一种:
优选地,所述输出材料的合成原料中,包括有分别包含有R1基团的第一原料和包含有R2基团的第二原料,其中,R1基团的第一原料可选自以下组分中任选一种:
R2基团的第二原料可选自以下组分中任选一种:
本发明还提供了一种N杂环平面状光耦输出材料的制备方法,其包括以下步骤:
步骤1)加入含有R1基团的第一原料、包含有R2基团的第二原料,Pd(dppf)Cl2和醋酸钾,抽通多次;
步骤2)在氩气氛围下打入除氧的N,N’-二甲基甲酰胺,在70-100℃反应24小时,冷却至室温;
步骤3)将反应液倒入冰水中,二氯甲烷萃取三次,合并有机相,旋成硅胶;
步骤4)柱层析分离纯化,得淡蓝色粉末。
所述含有R1基团的第一原料可选自以下组分中任选一种:
所述含有R2基团的第二原料可选自以下组分中任选一种:
优选地,所述第一原料的投入重量配比为:2.6g-3.4g,摩尔量为:10mmol;所述第二原料的投入重量配比为:1.0g-2.1g,摩尔量为:5mmol。
在步骤2)中,在氩气氛围下打入100ml除氧的N,N’-二甲基甲酰胺,在80℃反应24小时,冷却至室温。
步骤4)中,加入二氯甲烷和正己烷进行柱层析分离纯化,二氯甲烷和正己烷的配比(体积比)为1:3,经过柱层析分离纯化。
步骤3)中,将反应液倒入200ml冰水中,二氯甲烷萃取三次,合并有机相,旋成硅胶。
与现有技术相比,一般CPL材料的n值较低,在蒸镀制程中使用的厚度超过80nm,本发明通过平面状的CPL分子设计,使得CPL材料在蒸镀过程中能够平躺的排列,这样CPL材料具有非常高的n值。最后,基于目标CPL材料的顶发射电致发光器件都取得了非常高的效率,与此同时,器件中CPL的厚度从85nm减少到65nm,节约了时间和资金成本。由于设计的分子排列更加有序,使得材料具有较高的折射率,这样在制备OLED器件时,CPL材料对应的厚度减薄到65nm,减少了材料的使用量,同时高折射率的CPL提高了器件效率。
附图说明
图1为本发明顶发射器件的结构示意图。
图2为本发明N杂环平面状光耦输出材料中目标化合物的n值的曲线变化图。
具体实施方式
本发明的目的是实现平面状高n值CPL材料的合成以及其在发光器件中的应用。为了达到上述效果,本发明提供了一种N杂环平面状光耦输出材料,所述结构通式为:R1-R2-R1,其中,R1可选自以下结构中任一种,
R2可选自以下结构中任一种,
所述合成的输出材料结构式可选自以下结构中任选一种:
优选地,所述输出材料的合成原料中,包括有分别包含有R1基团的第一原料和包含有R2基团的第二原料,其中,R1基团的第一原料可选自以下组分中任选一种:
R2基团的第二原料可选自以下组分中任选一种:
原料(11)、(12)、(13)与原料(21)、(22)或(23)可以任意排列排列组合。
另外,第一原料为含溴的吸电子杂环,第二原料为含有大共轭基团的硼酸化合物,这样可以进行C-C偶联。
本发明还提供了一种N杂环平面状光耦输出材料的制备方法,其包括以下步骤:
步骤1)加入含有R1基团的第一原料、包含有R2基团的第二原料,Pd(dppf)Cl2和醋酸钾,抽通多次;
步骤2)在氩气氛围下,打入除氧的N,N’-二甲基甲酰胺,在70-100℃反应24小时,冷却至室温;
步骤3)将反应液倒入冰水中,二氯甲烷萃取三次,合并有机相,旋成硅胶;
步骤4)柱层析分离纯化,得淡蓝色粉末。
所述含有R1基团的第一原料可选自以下组分中任选一种:
所述含有R2基团的第二原料可选自以下组分中任选一种:
所述合成的输出材料结构式可选自以下结构中任选一种:
优选地,所述第一原料的投入重量配比为:2.6g-3.4g,摩尔量为:10mmol;所述第二原料的投入重量配比为:1.0g-2.1g,摩尔量为:5mmol。
在步骤2)中,在氩气氛围下打入100ml除氧的N,N’-二甲基甲酰胺,在80℃反应24小时,冷却至室温。
步骤4)中,加入二氯甲烷和正己烷进行柱层析分离纯化,二氯甲烷和正己烷的配比(体积比)为1:3,经过柱层析分离纯化。
步骤3)中,将反应液倒入200ml冰水中,二氯甲烷萃取三次,合并有机相,旋成硅胶。
实施例一
目标化合物1的合成路线:
合成步骤:
向250mL二口瓶中加入原料(11)(重量配比3.39g,10mmol),原料(12)(重量配比1.08g,5mmol),Pd(dppf)Cl2(重量配比0.36g,0.4mmol)和醋酸钾(重量配比0.12g,1.2mmol),抽通三次,在氩气氛围下打入100mL事先除氧的N,N’-二甲基甲酰胺,在80℃反应24小时;冷却至室温,将反应液倒入200mL冰水中,二氯甲烷萃取三次,合并有机相,旋成硅胶,柱层析(二氯甲烷:正己烷,v:v,1:3)分离纯化,得白色粉末2.17g,产率67%。MS(EI)m/z:646.18。
实施例二
目标化合物2的合成路线:
合成步骤:
向250mL二口瓶中加入原料(12)(重量配比3.09g,10mmol),原料(22)(重量配比1.33g,5mmol),Pd(dppf)Cl2(重量配比0.36g,0.4mmol)和醋酸钾(重量配比0.12g,1.2mmol),抽通三次,在氩气氛围下打入100mL事先除氧的N,N’-二甲基甲酰胺,在80℃反应24小时;冷却至室温,将反应液倒入200mL冰水中,二氯甲烷萃取三次,合并有机相,旋成硅胶,柱层析(二氯甲烷:正己烷,v:v,1:3)分离纯化,得白色粉末2.00g,产率63%。MS(EI)m/z:638.21。
实施例三
目标化合物3的合成路线:
合成步骤:
向250mL二口瓶中加入原料(13)(重量配比2.62g,摩尔量10mmol),原料(23)(重量配比2.09g,摩尔量5mmol),Pd(dppf)Cl2(重量配比0.36g,摩尔量0.4mmol)和醋酸钾(重量配比0.12g,摩尔量1.2mmol),抽通三次,在氩气氛围下打入100mL事先除氧的N,N’-二甲基甲酰胺,在80℃反应24小时;冷却至室温,将反应液倒入200mL冰水中,二氯甲烷萃取三次,合并有机相,旋成硅胶,柱层析(二氯甲烷:正己烷,v:v,1:3)分离纯化,得白色粉末2.11g,产率61%。MS(EI)m/z:694.89.
参照图1所示,本发明还提供了一种顶发射器件,其采用N杂环平面状光耦输出材料作为光耦合输出层,其中:包括依次层叠设置:基板层1、空穴注入层2、传输层3,电子阻挡层4,发光层5,空穴阻挡层6,电子传输层7,电子注入层8,半透明电极9,光耦合输出层10。
所述基板层1为玻璃和全反射(ITO/Ag/ITO)衬底层,其中Ag是反射面,使得器件的出光从顶部发射;
所述空穴注入层2,用于将空穴从ITO注入到OLED器件由MoO3制成;
所述空穴传输层3,用于将注入的空穴进行传输,同时通过调节它的厚度,可以起到调节微腔的谐振波长的作用。
所述电子阻挡层4,是将注入到发光层的电子阻挡在发光层,防止其向空穴传输层传输,限制激子的复合区域在发光层。
所述发光层5,用于将所述空穴和电子复合产生激子,使所,荧光材料在激子的作用下发光。
所述空穴阻挡层6,是将注入到发光层的空穴阻挡在发光层,防止其向电子传输层传输,限制激子的复合区域在发光层。
所述电子传输层7,是将注入的电子进行传输。
所述电子注入层8,是对OLED器件进行注入电子,一般为Yb或者LIF。
所述半透明阴极层9,用于半透明发射和透射作用,可调节微腔的强弱,由镁/银半透明电极制成;
所述耦合输出层,即为本发明设计的材料所构建的,是用来对光进行耦合粹取,提高光的出光率的。
器件的性能数据见下表:
器件 | CPL材料 | 最高电流效率(cd/A) | (CIEx,CIEy) | 最大外量子效率(%) |
器件1 | 化合物1 | 6.8 | (0.13,0.048) | 14.3% |
器件2 | 化合物2 | 6.7 | (0.13,0.046) | 14.1% |
器件3 | 化合物3 | 7.2 | (0.13,0.047) | 14.9% |
参照图2,以上数据说明N值越高,体现在OLED器件中则是对应的最高电流效率越高。n值为折射率,目标化合物的平面性是化合物3>化合物1>化合物2,n值关系与平面性吻合,说明高平面性对应的分子具有高的折射率。
现有的光耦合输出材料的N值在460nm处一般在1.9以下,本发明的材料其N值在460nm处大于1.95,因为提高了n值,在制备器件时光耦合输出层的的厚度减薄,同时器件效率提升。
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明技术原理的前提下,还可以做出若干改进和变型,这些改进和变型也应视为本发明的保护范围。
Claims (10)
4.一种N杂环平面状光耦输出材料的制备方法,其特征在于:包括以下步骤:
步骤1)加入含有R1基团的第一原料、包含有R2基团的第二原料,Pd(dppf)Cl2和醋酸钾,抽通多次;
步骤2)在氩气氛围下打入除氧的N,N’-二甲基甲酰胺,在70-100℃反应24小时,冷却至室温;
步骤3)将反应液倒入冰水中,二氯甲烷萃取三次,合并有机相,旋成硅胶;
步骤4)柱层析分离纯化,得淡蓝色粉末。
7.根据权利要求4所述的N杂环平面状光耦输出材料的制备方法,其特征在于:所述第一原料的投入重量配比为:2.6g-3.4g,摩尔量为:10mmol;所述第二原料的投入重量配比为:1.0g-2.1g,摩尔量为:5mmol。
8.根据权利要求4所述的N杂环平面状光耦输出材料的制备方法,其特征在于:在步骤2)中,在氩气氛围下打入100ml除氧的N,N’-二甲基甲酰胺,在80℃反应24小时,冷却至室温。
9.根据权利要求4所述的N杂环平面状光耦输出材料的制备方法,其特征在于:步骤4)中,加入二氯甲烷和正己烷进行柱层析分离纯化,二氯甲烷和正己烷的配比(体积比)为1:3,经过柱层析分离纯化。
10.根据权利要求4所述的N杂环平面状光耦输出材料的制备方法,其特征在于:步骤3)中,将反应液倒入200ml冰水中,二氯甲烷萃取三次,合并有机相,旋成硅胶。
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