CN115322778B - 苯基三氟甲磺酸酯增强CsPb(Br/Cl)3纳米晶光电性能的方法 - Google Patents
苯基三氟甲磺酸酯增强CsPb(Br/Cl)3纳米晶光电性能的方法 Download PDFInfo
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Abstract
本发明涉及光电材料领域,为了解决现有的CsPb(Br/Cl)3纳米晶光电性能不佳的问题,公开了苯基三氟甲磺酸酯增强CsPb(Br/Cl)3纳米晶光电性能的方法,包括以下步骤:步骤1:将十八烯、油酸以及碳酸铯放在三颈瓶中,得到油酸铯溶液;步骤2:将溴化铅、氯化铅、苯基三氟甲磺酸酯、油酸、油胺以及十八烯倒入到三颈瓶中,并在高温下注入步骤1中的油酸铯溶液。本发明利用苯基三氟甲磺酸酯处理的CsPb(Br/Cl)3纳米晶的发光强度和薄膜电导率得到提升,且样品形貌尺寸均一,发光色纯度高,光致发光量子效率高,薄膜电导率提升;且本发明提供的方法,操作简单,耗时少。
Description
技术领域
本发明涉及光电材料技术领域,尤其涉及苯基三氟甲磺酸酯增强CsPb(Br/Cl)3纳米晶光电性能的方法。
背景技术
金属卤化物钙钛矿纳米晶(PeNC)具有高光致发光量子效率(PLQY)、宽发射可调谐性、窄发射线宽度和低成本的溶液加工性等优点,已成为发展下一代发光二极管(LED)的有希望的光电材料。在过去的几年中,金属卤化物钙钛矿型 LED (PeLED)的性能有了显著的提高。然而,为了满足宽色域和高清晰度显示的要求,稳定和高效的纯蓝色 PeLED 符合国家电视系统委员会(NTSC)标准,其相应的发射波长在460-470纳米之间是非常急需的。
对于纯蓝色的电致发光二极管,有两种常用的策略来获得纯蓝色的电致发光: 调整钙钛矿Br和 Cl阴离子的组成的化学计量学和结构维度工程。然而,结构维数的降低增加了比表面积,导致大量的表面缺陷,从而往往产生较低的 PLQY。而且发射的颜色很难通过这种方式精确地调整。相比之下,混合卤化物PeNC可以很容易地在整个蓝色光谱范围内实现精确的发射调谐,只需调整溴和氯阴离子的比例。然而,在混合卤化物(Br/Cl)中,高 Cl组分很容易形成 Cl空位,并产生深陷阱态,这极大地降低了 PLQY。此外,在PeLED中的电场下Br和Cl离子易于通过缺陷辅助的离子迁移通道分离成富含Br和Cl的结构域,导致光谱稳定性差和器件降解。
发明内容
本发明的目的是为了解决现有技术中存在的缺点,而提出的苯基三氟甲磺酸酯增强CsPb(Br/Cl)3纳米晶光电性能的方法。
为了实现上述目的,本发明采用了如下技术方案:
苯基三氟甲磺酸酯增强CsPb(Br/Cl)3纳米晶光电性能的方法,包括以下步骤:
步骤1:将十八烯、油酸以及碳酸铯放在容器中,在真空环境下,加热脱气干燥,然后在惰性气体氛围下升温,加热搅拌至溶液溶解,得到油酸铯溶液;
步骤2:将溴化铅、氯化铅、苯基三氟甲磺酸酯、油酸、油胺倒入到装有十八烯的容器中,在真空环境下,加热脱气干燥,然后在惰性气体氛围下升温,将油酸铯溶液注入,充分反应后将溶液水浴冷却到室温;
步骤3:将步骤2中的反应产物离心提纯,将离心后的沉淀物分散到甲苯中,然后继续离心提纯,最后将离心后的沉淀分散到甲苯溶液中,即得到的苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶;
步骤4:初步制备基于苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶的LED;
在紫外光处理的清洁的ITO 基底上旋涂PEDOT: PSS,之后进行退火处理;然后将底物转移到充满N2气体的手套箱中,在PEDOT: PSS薄膜上旋涂聚[双(4-苯基)(4-丁基苯基)胺](Poly-TPD),形成PEDOT:PSS/Poly-TPD层,之后再进行退火处理,将PEDOT:PSS/Poly-TPD层作为空穴注入层和传输层;
将步骤3中制备好的苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶溶液旋涂在PEDOT:PSS/Poly-TPD层上,作为发光层;
步骤5:将步骤4中获得的产物最后转移到真空腔内,通过热蒸发依次沉积1,3,5-三[(3-吡啶基)-苯-3-基]苯(TmPyPB)、LiF/Al层,其中TmPyPB层作为电子传输层和电子阻挡层,LiF/Al层作为顶部电极;由此获得基于苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶的LED。
优选的,在步骤1中所述油酸与十八烯的体积比为1:12。
优选的,在步骤1和步骤2中,通入的惰性气体为氮气。
优选的,在步骤2中,十八烯、油酸和油胺的体积比为 10:1:1。
优选的,在步骤3中,所述离心转速为5000-10000r/min。
优选的,在步骤4中,所述旋涂PEDOT: PSS的转速为4000 r/min,旋涂Poly-TPD的转速为4000 r/min,纳米晶旋涂在PEDOT: PSS/Poly-TPD层上的转速为1000 r/min。
优选的,在步骤4中,所述PEDOT: PSS的退火处理具体为140℃的温度下退火15min,Poly-TPD的退火处理具体为在140℃的温度下退火15min。
本发明的有益效果为:
本发明利用苯基三氟甲磺酸酯处理的CsPb(Br/Cl)3纳米晶的发光强度和薄膜电导率得到提升。将其作为发光层制备的LED具有在469nm发射波长下的高光谱稳定性和355cd cm−2的高亮度,外量子效率由0.35%提升至1.2%,操作半衰期(T50)由12s提升至42s。
本发明提供的苯基三氟甲磺酸酯增强CsPb(Br/Cl)3纳米晶薄膜的光电性能的方法,此方法操作简单,耗时少;本发明方法所制备的苯基三氟甲磺酸酯处理的CsPb(Br/Cl)3纳米晶的样品形貌尺寸均一,发光色纯度高,光致发光量子效率高,薄膜电导率提升。
附图说明
图1为加入不同苯基三氟甲磺酸酯量的CsPb(Br/Cl)3纳米晶的吸收光谱和光致发光光谱;
图2为基于原始和苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶的纯电子器件的电流密度-电压曲线;
图3为纯苯基三氟甲磺酸酯,原始和苯基三氟甲磺酸酯优化后的 CsPb(Br/Cl)3纳米晶的傅里叶红外图谱;
图4为基于原始和苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶的LED的器件结构图;
图5 为基于原始和苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶的LED的亮度-电压曲线;
图6 为基于原始和苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶的LED的电流密度-外量子效率曲线;
图 7 为基于原始和苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶的类电容器器件的电流-电压曲线;
图8 为基于原始和苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶的LED的在4V-8V电压变化下的光谱稳定性;
图9为基于原始和苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶的LED在5V持续电压下的工作稳定性。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。
苯基三氟甲磺酸酯增强CsPb(Br/Cl)3纳米晶薄膜光电性能的方法,该方法包括以下步骤:
1)首先将0.814 g的碳酸铯,2.5 mL油酸和30 mL十八烯装入100mL的三颈烧瓶中,先在真空、120℃下脱气干燥1h,然后混合溶液在氮气氛围下,加热至150℃,搅拌3h直到形成澄清的溶液,即得到前驱体溶液。
2)其次将0.225 mmol的溴化铅、0.150 mmol的氯化铅、苯基三氟甲磺酸酯、10mL的ODE、1mL的油胺和1mL的油酸装入到50 mL的三颈烧瓶中,先在真空、120℃下脱气干燥1h,随后在氮气氛围下,在溶液升温至170℃后,将0.8mL前驱体溶液迅速注入,反应5s后迅速将溶液水浴冷却到室温;
3)最后将反应产物离心提纯,将离心后的沉淀分散到甲苯中,然后继续离心提纯,最后将离心后的沉淀分散到甲苯中,即得到苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶;
4):初步制备基于苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶的LED;
在紫外光处理的清洁的ITO 基底上旋涂PEDOT: PSS,以4000r/min的转速旋涂60秒,之后在140℃的温度下退火15分钟;然后将底物转移到充满N2气体的手套箱中,在PEDOT: PSS薄膜上旋涂[双(4-苯基)(4-丁基苯基)胺](Poly-TPD),以4000r/min的转速旋涂50秒,之后在140℃的温度下退火15分钟,形成PEDOT:PSS/Poly-TPD层,将PEDOT:PSS/Poly-TPD层作为空穴注入层和传输层;
将步骤3)中制备好的苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶溶液以1000r/min的转速旋涂在PEDOT:PSS/Poly-TPD层上40s,作为发光层;
5):将步骤4)中获得的产物最后转移到真空腔内,通过热蒸发依次沉积1,3,5-三[(3-吡啶基)-苯-3-基]苯(TmPyPB)、LiF/Al层,其中TmPyPB层作为电子传输层和电子阻挡层,LiF/Al层作为顶部电极;由此获得基于苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶的LED。
如图1所示,加入苯基三氟甲磺酸酯可以提高CsPb(Br/Cl)3纳米晶的发光强度,并且150ul的苯基三氟甲磺酸酯溶液是最佳的添加量。
如图2所示,通过空间电荷限制电流(SCLC)法可知,陷阱填充极限电压 VTFL的下降表明了优化的CsPb(Br/Cl)3纳米晶中缺陷态密度的减少。
如图3所示,在苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶中新出现了来自苯基三氟甲磺酸酯的S=O特征峰,在优化的CsPb(Br/Cl)3纳米晶中观察到1437 cm-1的额外信号,但在对照的CsPb(Br/Cl)3纳米晶中没有观察到,这可归因于苯基三氟甲磺酸酯中磺酸基团S=O键的拉伸振动,证实优化的CsPb(Br/Cl)3纳米晶中存在苯基三氟甲磺酸酯。此外,与苯基三氟甲磺酸酯相比,优化后的CsPb(Br/Cl)3纳米晶在较低的波数下表现出S=O键的特征峰,表明苯基三氟甲磺酸酯与CsPb(Br/Cl)3纳米晶之间存在较强的相互作用。
进一步地,如图4所示,利用苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶作为发光层,PEDOT:PSS/Poly-TPD层作为空穴注入层和传输层,TmPyPB层作为电子传输层和电子阻挡层,LiF/Al层作为顶部电极,制备了LED。如图5,6所示,该LED实现355 cd/m2的最大亮度和1.2%的峰值外量子效率。
如图7所示,制备了具有ITO/钙钛矿/银结构的类电容器器件,以测试优化前后的钙钛矿薄膜的电导率。由于厚度和器件面积相同,较大的1/R表示较高的电导率。
如图8,9所示,该LED的光谱和运行稳定性得到提升。
本发明利用苯基三氟甲磺酸酯处理的CsPb(Br/Cl)3纳米晶的发光强度和薄膜电导率得到提升。将其作为发光层制备的LED具有在469nm发射波长下的高光谱稳定性和355cd cm−2的高亮度,外量子效率由0.35%提升至1.2%,操作半衰期(T50)由12s提升至42s。
本发明提供的苯基三氟甲磺酸酯增强CsPb(Br/Cl)3纳米晶薄膜的光电性能的方法,此方法操作简单,耗时少;本发明方法所制备的苯基三氟甲磺酸酯处理的CsPb(Br/Cl)3纳米晶的样品形貌尺寸均一,发光色纯度高,光致发光量子效率高,薄膜电导率提升。
以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。
Claims (7)
1.苯基三氟甲磺酸酯增强CsPb(Br/Cl)3纳米晶光电性能的方法,其特征在于,包括以下步骤:
步骤1:将十八烯、油酸以及碳酸铯放在容器中,在真空环境下,加热脱气干燥,然后在惰性气体氛围下升温,加热搅拌至溶液溶解,得到油酸铯溶液;
步骤2:将溴化铅、氯化铅、苯基三氟甲磺酸酯、油酸、油胺倒入到装有十八烯的容器中,在真空环境下,加热脱气干燥,然后在惰性气体氛围下升温,将油酸铯溶液注入,充分反应后将溶液水浴冷却到室温;
步骤3:将步骤2中的反应产物离心提纯,将离心后的沉淀物分散到甲苯中,然后继续离心提纯,最后将离心后的沉淀分散到甲苯溶液中,即得到的苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶;
步骤4:初步制备基于苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶的LED;
在紫外光处理的清洁的ITO 基底上旋涂PEDOT: PSS,之后进行退火处理;然后将底物转移到充满N2气体的手套箱中,在PEDOT: PSS薄膜上旋涂聚[双(4-苯基)(4-丁基苯基)胺](Poly-TPD),形成PEDOT:PSS/Poly-TPD层,之后再进行退火处理,将PEDOT:PSS/Poly-TPD层作为空穴注入层和传输层;
将步骤3中制备好的苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶溶液旋涂在PEDOT:PSS/Poly-TPD层上,作为发光层;
步骤5:将步骤4中获得的产物最后转移到真空腔内,通过热蒸发依次沉积1,3,5-三[(3-吡啶基)-苯-3-基]苯(TmPyPB)、LiF/Al层,其中TmPyPB层作为电子传输层和电子阻挡层,LiF/Al层作为顶部电极;由此获得基于苯基三氟甲磺酸酯优化后的CsPb(Br/Cl)3纳米晶的LED。
2.根据权利要求1所述的苯基三氟甲磺酸酯增强CsPb(Br/Cl)3纳米晶光电性能的方法,其特征在于,在步骤1中所述油酸与十八烯的体积比为1:12。
3.根据权利要求1所述的苯基三氟甲磺酸酯增强CsPb(Br/Cl)3纳米晶光电性能的方法,其特征在于,在步骤1和步骤2中,通入的惰性气体为氮气。
4.根据权利要求1所述的苯基三氟甲磺酸酯增强CsPb(Br/Cl)3纳米晶光电性能的方法,其特征在于,在步骤2中,十八烯、油酸和油胺的体积比为 10:1:1。
5.根据权利要求1所述的苯基三氟甲磺酸酯增强CsPb(Br/Cl)3纳米晶光电性能的方法,其特征在于,在步骤3中,所述离心转速为5000-10000 r/min。
6.根据权利要求1所述的苯基三氟甲磺酸酯增强CsPb(Br/Cl)3纳米晶光电性能的方法,其特征在于,在步骤4中,所述旋涂PEDOT: PSS的转速为4000 r/min,旋涂Poly-TPD的转速为4000 r/min,纳米晶旋涂在PEDOT: PSS/Poly-TPD层上的转速为1000 r/min。
7.根据权利要求1所述的苯基三氟甲磺酸酯增强CsPb(Br/Cl)3纳米晶光电性能的方法,其特征在于,在步骤4中,所述PEDOT: PSS的退火处理具体为140℃的温度下退火15min,Poly-TPD的退火处理具体为在140℃的温度下退火15min。
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