CN111748347A - 量子点及光转换膜 - Google Patents
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Abstract
本申请公开了一种量子点及光转换膜。量子点含有Zn、Cd、Se、S四种元素，所述量子点的R450值在1～3之间；其中，R450值的定义为量子点在450nm处的吸光度与量子点在其荧光发射峰峰值波长处的吸光度的比值。在蓝光长时间照射下，本申请中量子点依然能保持极好的荧光发光强度。
Description
技术领域
本申请涉及纳米材料领域，尤其涉及一种量子点及光转换膜。
背景技术
量子点是一种三维尺寸均在1nm至100nm之间的半导体纳米晶体，其具备荧光发射峰半峰宽窄、稳定性好等优点，量子点被广泛的用于发光设备领域。
采用量子点作为光转换材料的显示装置中，量子点一般被分散在聚合物中作为光转换膜使用，在蓝光光源的激发下，量子点膜发射红光或者绿光，以此得到白光背光源。在蓝光照射下，提高量子点的使用稳定性对显示装置的发展具有重要意义。
发明内容
本申请的目的在于提供一种在蓝光照射下，使用稳定性好的量子点。
根据本申请的一个方面，提供一种量子点，所述量子点含有Zn、Cd、Se、S四种元素，所述量子点的R450值在1～3之间；
其中，
A450为所述量子点在450nm处的吸光度，APL为所述量子点在其荧光发射峰峰值波长处的吸光度。
在测试量子点的吸光度或者荧光发射光谱时，均将量子点分散在非极性溶剂中，非极性溶剂可以选自甲苯、氯仿等。且为了保证量子点溶液的吸光度测定的准确性，测试所选择的条件一般为量子点的浓度在0.1mg/ml～0.3mg/ml。
此外，在不同溶剂中，所得到的R450值可能略微有差别，本申请中，R450值优选根据在甲苯或者氯仿中的吸光度计算得到。
本申请通过选择含有上述元素组成，以及上述R450值范围的量子点时，发现量子点在蓝光照射下的使命稳定性极好。
可选地，所述量子点的R450值在1.5～2.5之间。R450值更优选在1.8～2.2之间。具体可以为1.8、1.9、2.0、2.1、2.2。
可选地，所述Cd元素占量子点的含量在0.5wt％～3wt％之间。
可选地，所述Cd元素占量子点的含量在1wt％～2wt％之间。具体可以为1.0wt％、1.1wt％、1.2wt％、1.3wt％、1.4wt％、1.5wt％、1.6wt％、1.7wt％、1.8wt％、1.9wt％、2.0wt％。
可选地，所述Zn元素占量子点的含量在50wt％～80wt％之间；所述S元素占量子点的含量在20wt％～40wt％之间；所述Se元素占量子点的含量在10wt％～30wt％之间。
可选地，所述量子点的荧光发射峰峰值波长在525nm～535nm之间。
可选地，所述量子点为合金结构。在从量子点的中心朝向外的方向上，元素组成可能具有梯度变化，而不是完全一样的成分；同样的，也不存在明显的核、壳界面层。可选地，所述量子点的最外表面层的组分基本为ZnS。
可选地，所述量子点的尺寸在8nm～12nm之间。
根据本申请的一个方面，提供一种光转换膜，光转换膜包括聚合物以及分散在所述聚合物中的如上所述的量子点。聚合物优选包括聚丙烯酸树脂、聚环氧树脂、聚苯乙烯等。
有益效果：本申请中提供一种含有Zn、Cd、Se、S四种元素，且R450值在1～3之间的量子点，该量子点在蓝光照射下的使用稳定性极好。
附图说明
图1为实施例1中所制备的量子点的HRTEM图；
图2为实施例1中所制备的量子点的荧光发射光谱图；
图3为实施例1中所制备的量子点的紫外-可见光吸收光谱图。
具体实施方式
下面将结合本申请实施方式，对本申请实施例中的技术方案进行详细地描述。应注意的是，所描述的实施方式仅仅是本申请一部分实施方式，而不是全部实施方式。
分析方法
[1]荧光分析
使用Hitachi F-7000光谱仪在365nm的辐射波长处获得所制造的纳米晶体的荧光发射光谱。
[2]紫外光谱法分析
使用Hitachi U-3310光谱仪进行紫外光谱法分析以获得紫外-可见光吸收光谱。
[3]HRTEM(高分辨透射电子显微镜)分析
使用TEM-Titan G2进行HRTEM分析。
[4]蓝光照射稳定性评价
采用发射447nm波长的蓝光LED灯进行照射。
[5]元素分析
采用透射电子显微镜法-能量色散X射线(TEM-EDX)分析。
前驱体的配制
镉锌溶液配制：取1mmol的氧化镉、30mmol的氧化锌、30mmol的油酸、70mmol的十八烯置于250ml的三颈烧瓶中，升温至300℃溶解。
TOP-Se溶液的配制：称取硒粉40mmol置于20ml三辛基膦(TOP)中，超声溶解，得到无色透明液体。
TOP-S溶液的配制：称取硫粉40mmol置于20ml的TOP中，超声溶解，得到无色透明液体。
实施例1
量子点的制备：
取50ml如上配制的镉锌溶液，升温至310℃，注射1ml的TOP-Se溶液、1ml的TOP-S溶液，维持30min，降温至260℃后，滴加2.5ml的TOP-S溶液，维持60min，再滴加6mmol的正十二硫醇，维持40min，降温至室温得到量子点，将量子点纯化、分散在甲苯中待用，使得量子点的浓度在约0.1mg/ml。
图1为实施例1中制备的量子点的HRTEM图。从图中可以看出，量子点的尺寸约在10nm左右。
图2为实施例1中所制备的量子点的荧光发射光谱图。从图中可以看出，量子点的荧光发射峰峰值波长约在526nm。
图3为实施例1中所制备的量子点的紫外-可见光吸收光谱图。从图中可以看出，量子点在450nm处的吸光度(任意单位)约为0.06227，量子点在526nm处的吸光度(任意单位)约为0.03257，即可以计算得到量子点的R450值约在1.91。
下表为实施例1中制备的量子点的元素分析结果，对量子点的各个元素含量进行分析时，需要预先对量子点的表面配体进行多次清洗、去除配体，以确保表面配体的含量基本可以忽略不计。
| 元素 | Cd | Zn | Se | S |
| 含量(wt％) | 1.3 | 63.2 | 10.1 | 25.3 |
采用照射强度为300mW/cm2、发射447nm波长的蓝光LED灯对实施例1中量子点溶液进行照射，定期测试其荧光发射峰的峰值强度，测试结果表明，在蓝光持续照射100h后，荧光发射峰峰值强度保有率在95％左右，充分说明本申请中量子点在蓝光照射下的使用稳定性。
尽管发明人已经对本申请的技术方案做了较详细的阐述和列举，应当理解，对于本领域技术人员来说，对上述实施例作出修改和/或变通或者采用等同的替代方案是显然的，都不能脱离本申请精神的实质，本申请中出现的术语用于对本申请技术方案的阐述和理解，并不能构成对本申请的限制。
Claims (10)
1.一种量子点，其特征在于，所述量子点含有Zn、Cd、Se、S四种元素，所述量子点的R450值在1～3之间；
其中，R450值的定义为：
A450为所述量子点在450nm处的吸光度，APL为所述量子点在其荧光发射峰峰值波长处的吸光度。
2.根据权利要求1所述的量子点，其特征在于，所述量子点的R450值在1.5～2.5之间。
3.根据权利要求1所述的量子点，其特征在于，所述Cd元素占量子点的含量在0.5wt％～3wt％之间。
4.根据权利要求1所述的量子点，其特征在于，所述Cd元素占量子点的含量在1wt％～2wt％之间。
5.根据权利要求1所述的量子点，其特征在于，所述Zn元素占量子点的含量在50wt％～80wt％之间；所述S元素占量子点的含量在20wt％～40wt％之间；所述Se元素占量子点的含量在10wt％～30wt％之间。
6.根据权利要求1所述的量子点，其特征在于，所述量子点的荧光发射峰峰值波长在525nm～535nm之间。
7.根据权利要求1所述的量子点，其特征在于，所述量子点为合金结构。
8.根据权利要求1所述的量子点，其特征在于，所述量子点的最外表面层的组分基本上为ZnS。
9.根据权利要求1所述的量子点，其特征在于，所述量子点的尺寸在8nm～12nm之间。
10.一种光转换膜，其特征在于，包括聚合物以及分散在所述聚合物中的如上权利要求1至9中任一所述的量子点。
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| CN108264900A (zh) * | 2016-12-30 | 2018-07-10 | Tcl集团股份有限公司 | 一种量子点复合材料、制备方法及半导体器件 |
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