CN114058067A - 一种制备钙钛矿量子点-聚合物多孔复合材料的方法 - Google Patents

一种制备钙钛矿量子点-聚合物多孔复合材料的方法 Download PDF

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CN114058067A
CN114058067A CN202111392804.7A CN202111392804A CN114058067A CN 114058067 A CN114058067 A CN 114058067A CN 202111392804 A CN202111392804 A CN 202111392804A CN 114058067 A CN114058067 A CN 114058067A
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李璠
郭威
王晓峰
夏雪峰
徐翼飞
徐光勇
李样生
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Abstract

本发明公开了一种制备高亮度高稳定性钙钛矿量子点‑聚合物多孔复合材料的方法，包括以下步骤：S1.含铅前驱体溶液的制备，S2.卤化甲胺、卤化甲脒、卤化铯的溶液制备，S3.含铅多孔聚合物材料的制备，S4.多孔钙钛矿量子点‑聚合物复合材料的制备；依照本发明的方法，能够得到具有发光亮度高、稳定性好的多孔钙钛矿量子点‑聚合物复合材料。

Description

一种制备钙钛矿量子点-聚合物多孔复合材料的方法
技术领域
本发明属于复合材料领域，具体涉及一种制备高亮度高稳定性钙钛矿量子点-聚合物多孔复合材料的方法。
背景技术
钙钛矿量子点是一种十分具有潜力的材料，由于其具有窄的发射光谱、宽的可调荧光发射、高的发光效率等优异的光学性能以及其较低的成本，使其在发光二极管、激光器等高性能光电器件领域备受关注。但是钙钛矿材料的形成能较低，且钙钛矿量子点具有大的比表面积、表面能高，同时表面配体处于动态平衡，从而存在大量的表面缺陷，导致其对外界环境高度敏感，表现出较低的稳定性，严重制约了其实际应用。
针对这一问题，提出一种制备高亮度高稳定性钙钛矿量子点-聚合物多孔复合材料的方法，即首先以方糖为牺牲模板，将含铅离子的甲基丙烯酸铅和聚合物单体引入到方糖中，通过自由基热交联聚合方式，形成热交联的含铅聚合物。再将方糖置于水中溶解，得到多孔的含铅离子的热交联有机聚合物多孔材料。之后，将该多孔含铅有机聚合物材料置于卤化甲胺（或卤化甲脒、卤化铯）溶液中，经反复真空处理排出气体，再经加热烘干，制备得到钙钛矿量子点-聚合物多孔复合材料。研究表明，该多孔复合材料具有高的荧光量子产率和优异的稳定性。
发明内容
本发明的目的是提供了一种制备高亮度高稳定性钙钛矿量子点-聚合物多孔复合材料的方法。
为实现上述目的，本发明采用以下技术方案：
一种制备钙钛矿量子点-聚合物多孔复合材料的方法，包括以下步骤：
S1.含铅前驱体溶液的制备：将甲基丙烯酸铅溶于聚合物单体中，配制浓度为(2.25~10)×10-5 mol/mL的溶液，同时加入自由基引发剂，充分搅拌混合，再用滤头过滤，备用；
S2.卤化甲胺、卤化甲脒、卤化铯的溶液制备：将卤化甲胺或卤化甲脒或卤化铯溶于二甲基亚砜溶剂中，配制浓度为(5~10)×10-5 mol/mL的溶液中，充分搅拌，备用；
S3.含铅多孔聚合物材料的制备：将S1中配置的含铅前驱体溶液滴加在方糖中，经真空处理，使方糖中的空气排出，重复多次使方糖中的空气排尽，使含铅前驱体溶液充满方糖空隙中；再用铝箔将充满溶液的方糖包裹好，避免溶液挥发造成损失，放置于烘箱中加热交联，将交联完成的方糖浸置于大量蒸馏水中，将其中的糖分溶解，再将其进行真空干燥，得到含铅离子的多孔聚合物材料；
S4. 多孔钙钛矿量子点-聚合物复合材料的制备：将S2中配置的卤化甲胺、卤化甲脒、卤化铯的溶液滴至含铅离子的多孔聚合物材料中，用热风枪加热，制备得到多孔钙钛矿量子点-聚合物复合材料。
步骤S1中的自由基引发剂加入量为0.02~0.04g/mL。
步骤S3中烘箱的温度为60~70℃，加热时间为10~15h。
本发明结果表明，所制备的多孔钙钛矿量子点-聚合物复合材料具有发光亮度高、稳定性好的特点。本发明为制备具有高效荧光、稳定的多孔钙钛矿量子点-聚合物复合材料提供了一种新的工艺和方法。
本发明的有益效果是：本发明的工艺过程简单，制备参数易于控制，重复性好，为制备具有高效荧光、稳定的多孔钙钛矿量子点-聚合物复合材料提供了一种新的工艺和方法。
附图说明
图1为实施例1中所制备的CsPbBr3量子点/PMMA多孔复合材料在紫外灯下的照片。
图2为实施例1中所制备的CsPbBr3量子点/PMMA多孔复合材料的荧光光谱。
图3为实施例1中所制备的CsPbBr3量子点/PMMA多孔复合材料的X射线衍射图谱。
图4为实施例1中所制备的CsPbBr3量子点/PMMA多孔复合材料的湿度稳定性。
具体实施方式
下面结合附图和实施例对本发明作进一步说明。
实施例：参见图1-图4。
一种制备钙钛矿量子点-聚合物多孔复合材料的方法，包括以下步骤：
S1.含铅前驱体溶液的制备：将甲基丙烯酸铅溶于聚合物单体中，配制浓度为(2.25~10)×10-5 mol/mL的溶液，同时加入自由基引发剂，充分搅拌混合，再用滤头过滤，备用；
S2.卤化甲胺、卤化甲脒、卤化铯的溶液制备：将卤化甲胺或卤化甲脒或卤化铯溶于二甲基亚砜溶剂中，配制浓度为(5~10)×10-5 mol/mL的溶液中，充分搅拌，备用；
S3.含铅多孔聚合物材料的制备：将S1中配置的含铅前驱体溶液滴加在方糖中，经真空处理，使方糖中的空气排出，重复多次使方糖中的空气排尽，使含铅前驱体溶液充满方糖空隙中；再用铝箔将充满溶液的方糖包裹好，避免溶液挥发造成损失，放置于烘箱中加热交联，将交联完成的方糖浸置于大量蒸馏水中，将其中的糖分溶解，再将其进行真空干燥，得到含铅离子的多孔聚合物材料；
S4. 多孔钙钛矿量子点-聚合物复合材料的制备：将S2中配置的卤化甲胺、卤化甲脒、卤化铯的溶液滴至含铅离子的多孔聚合物材料中，用热风枪加热，制备得到多孔钙钛矿量子点-聚合物复合材料。
步骤S3中烘箱的温度为60~70℃，加热时间为10~15h。
实施例1：
将甲基丙烯酸铅溶于甲基丙烯酸甲酯 (MMA)中，配制浓度为6×10-5 mol/mL的溶液1mL，同时加入0.03 g的2-2偶氮二异丁腈(AIBN)，充分混合后并用滤头过滤掉大颗粒，将溶液滴加在方糖中并真空处理，使方糖中的空气排出，重复多次使方糖中的空气排尽，溶液充满方糖空隙中。用铝箔将充满溶液的方糖包裹好，避免溶液挥发造成损失。放置于烘箱中65℃加热交联12 h。将交联完成的方糖浸置于大量蒸馏水中将其中的糖分溶解得到聚合物，再将方糖溶解后的聚合物通过真空干燥获得热交联的聚甲基丙烯酸甲酯共聚甲基丙烯酸铅多孔复合材料。之后，将溴化铯溶于二甲基亚砜溶剂中，配制浓度为5×10-5 mol/mL的溶液1mL，将配制的溶液滴至多孔复合材料中，用热烘枪加热获得内部生长CsPbBr3量子点的CsPbBr3/PMMA多孔复合物。图1-4分别为所制备的CsPbBr3/PMMA杂化薄膜在紫外灯下的照片、荧光光谱、X射线衍射图谱和湿度稳定性。从图中可以看出，所制备的CsPbBr3/PMMA杂化薄膜中CsPbBr3量子点的发光峰位于518nm，为立方晶体结构，荧光量子产率为45%。该CsPbBr3/PMMA杂化薄膜具有良好的稳定性。
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该理解，对本发明的技术方案进行修改或者等同替换，都不脱离本发明技术方案的精神和范围，其均应涵盖在本发明的权利要求范围当中。

Claims (3)

1.一种制备钙钛矿量子点-聚合物多孔复合材料的方法，其特征在于，包括以下步骤：
S1.含铅前驱体溶液的制备：将甲基丙烯酸铅溶于聚合物单体中，配制浓度为(2.25~10)×10-5 mol/mL的溶液，同时加入自由基引发剂，充分搅拌混合，再用滤头过滤，备用；
S2.卤化甲胺、卤化甲脒、卤化铯的溶液制备：将卤化甲胺或卤化甲脒或卤化铯溶于二甲基亚砜溶剂中，配制浓度为(5~10)×10-5 mol/mL的溶液中，充分搅拌，备用；
S3.含铅多孔聚合物材料的制备：将S1中配置的含铅前驱体溶液滴加在方糖中，经真空处理，使方糖中的空气排出，重复多次使方糖中的空气排尽，使含铅前驱体溶液充满方糖空隙中；再用铝箔将充满溶液的方糖包裹好，避免溶液挥发造成损失，放置于烘箱中加热交联，将交联完成的方糖浸置于大量蒸馏水中，将其中的糖分溶解，再将其进行真空干燥，得到含铅离子的多孔聚合物材料；
S4. 多孔钙钛矿量子点-聚合物复合材料的制备：将S2中配置的卤化甲胺、卤化甲脒、卤化铯的溶液滴至含铅离子的多孔聚合物材料中，用热风枪加热，制备得到多孔钙钛矿量子点-聚合物复合材料。
2.根据权利要求1所述的一种制备钙钛矿量子点-聚合物多孔复合材料的方法，其特征在于：步骤S1中的自由基引发剂加入量为0.02~0.04g/mL。
3.根据权利要求1所述的一种制备钙钛矿量子点-聚合物多孔复合材料的方法，其特征在于：步骤S3中烘箱的温度为60~70℃，加热时间为10~15h。
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