CN112711154A - 量子点膜及其制作方法 - Google Patents
量子点膜及其制作方法 Download PDFInfo
- Publication number
- CN112711154A CN112711154A CN202011141668.XA CN202011141668A CN112711154A CN 112711154 A CN112711154 A CN 112711154A CN 202011141668 A CN202011141668 A CN 202011141668A CN 112711154 A CN112711154 A CN 112711154A
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- Prior art keywords
- quantum dot
- quantum
- quantum dots
- film
- dot layer
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Abstract
本发明揭露一种量子点膜,其包括:一黏合剂;以及多个量子点,分散在该黏合剂中,其中所述多个量子点能够耐水与耐氧。
Description
技术领域
本发明有关于一种光学膜,尤其涉及一种量子点光学膜。
背景技术
量子点是纳米大小的小型球形半导体粒子,其有一个特点就是当受到光或电的激发时,量子点会发出有色光谱,其颜色则由量子点本身的材料组成和尺寸大小所决定,通过此一特性量子点能够改变光源发出的光线颜色,因此可广泛运用在显示器,达到提升显示的色域空间(Color gamut),增强LCD的色彩和亮度,使LCD显示器的NTSC色域可达到~110%。
常见的量子点材料是由IV、II-VI,IV-VI或III-V元素组成,如有硅量子点、锗量子点、硫化镉量子点、硒化镉量子点、碲化镉量子点、硒化锌量子点、硫化铅量子点、硒化铅量子点、磷化铟量子点和砷化铟量子点等。目前被广泛使用的量子点材料主要有硒化镉(CdSe)系列和磷化铟(InP)系列两种,前者主要由QD Vision所采用,后者主要由Nanoco采用,而Nanosys采用磷化铟和镉混合量子点方案。两种量子点各有优劣,硒化镉胜在发光效率高、色域表现力更为宽广,但含有镉重金属问题;磷化铟则由于不含镉,故不受欧盟ROHS标准的限制。
目前市场上出售的所谓的「量子点电视」,均是搭载了量子点膜的液晶电视,主要分为管式量子点背光源和薄膜式量子点背光源,前者主要由美国的QD Vision生产,称为Color IQ光学元件;后者主要由美国的Nanosys公司生产,称为QDEF薄膜。由于三色光由蓝光直接转换而来,量子点背光源相比普通LED背光具有更高纯度的三基色,通过调整量子点材料大小分布,可以是创造出更真实、更均衡的色彩表现。
传统量子点光学膜产品,为上下具有一阻气膜(gas barrier film)设计,中间包夹量子点主结构层的三明治结构的量子点光学膜,该量子点主结构层一般为有含镉量子点光学膜,或是低镉量子点光学膜,或无镉量子点光学膜,其厚度一般为50~300um不等,该量子点光学膜在LCD显示器的运用上,目前皆是与增量膜经堆迭后再组装进背光膜组中。因此在背光膜组中将会增加整体的膜片厚度与组装流程时间,进而增加LCD显示器整体的厚度与制程及材料成本。
因此,本发明提出了一种克服上述缺点的新解决方案。
发明内容
量子点膜包括黏合剂和分散在所述黏合剂中的多个量子点,其中所述量子点能够具有足够的防水性和耐氧性,而在所述量子点膜上不形成阻挡层。为了简化量子点膜的制造复杂性并减小量子点膜的总厚度。
在一实施例中,本发明揭露一种量子点膜(quantum-dot film),其包括:量子点层(quantum-dot layer),其包括黏合剂和分散在所述黏合剂中的多个量子点(quantumdots),其中所述多个量子点能够耐水与耐氧气。
在一实施例中,在量子点层上方没有设置用于防止量子点受到水或氧气影响的阻挡层。
在一实施例中,量子点层还包括多个扩散粒子(diffusion particles)。
在一实施例中,量子点包括Cd。
在一实施例中,量子点中Cd的浓度(concentration)为0.1-10%。
在一实施例中,量子点中Cd的浓度(concentration)为0.3-2%。
在一实施例中,量子点层中的量子点的浓度(concentration)为0.05-20%。
在一实施例中,量子点层中的量子点的浓度(concentration)为0.05-8%。
在一实施例中,量子点膜的厚度为25-350um。
在一实施例中,该材料是至少以下的一种:聚对苯二甲酸乙二酯(polyethyleneterephthalate,PET),聚萘二甲酸乙二酯(PEN),聚丙烯酸酯(PAR),聚碳酸酯(PC)或三乙酸纤维素(TAC)。
在一实施例中,量子点层具有第一主表面和与第一主表面相对的第二主表面,其中量子点层的第一主表面及/或第二主表面中包括一结构化的表面。
在一实施例中,本发明公开了一种光学膜,其包括:分散在其中的多个量子点,其中所述多个量子点能够耐水与耐氧。
在一实施例中,光学膜还包括多个扩散粒子。
在一实施例中,本发明揭露形成一种量子点膜的方法,该方法包括:在多个量子点上执行工艺,以使多个量子点能够防水和抗氧;以及形成包括黏合剂和分散在黏合剂中的多个量子点的量子点层,其中所述多个量子点能够耐水与耐氧。
在一实施例中,黏合剂由聚对苯二甲酸乙二酯(PET)材料制成,其中多个量子点通过微双螺杆挤出机纳米分散处理技术分散到聚对苯二甲酸乙二酯(PET)材料中。
在一实施例中,该方法还包括使用共挤出和双轴拉伸技术来形成聚对苯二甲酸乙二酯(PET)量子点光学膜。
在参阅接下来的段落及所附图式所描述的本发明的实施例及详细技术之后,本领域技术人员便可了解本发明的技术特征及实施方案。
附图说明
图1示出了本发明的一个实施例中的量子点膜的截面示意图。
图2示出了本发明的一个实施例中的量子点膜的截面示意图。
图3示出了本发明的一个实施例中的量子点膜的示意性截面图,其中,量子点层的第一主表面和第二主表面均具有一结构化表面。
图4示出了本发明的一个实施例中的量子点膜的形成方法的流程图。
图5A示出了本发明的一个实施例中的量子点膜的光亮度性能。
图5B示出了本发明的一个实施例中的量子点膜的光亮度性能。
附图标记列表:100-量子点膜;101A-量子点;102-第一阻挡层;103-第二阻挡层;101B-黏合剂;101A-多个量子点;200-量子点膜;201A-量子点;201B-黏合剂;211-第一主表面;212-第二主表面;213、214-结构化表面。
具体实施方式
本发明的详细说明于随后描述,这里所描述的较佳实施例是作为说明和描述的用途,并非用来限定本发明的范围。
量子点膜中的量子点对降解(degradation)高度敏感,因此量子点膜应具有优异的阻隔性能,以防止由氧或水引起的量子点膜中的量子点损坏而导致降解。量子点薄膜的性能。如图1所示,量子点膜100包括第一阻挡层102,第二阻挡层103和在第一阻挡层102和第二阻挡层103之间的黏合剂101B。多个量子点101A分散在黏合剂101B中。阻挡层102、103可以保护量子点101A可防止由氧气或水引起的损坏,然而,阻挡层102、103将增加量子点膜100的总厚度和制造复杂性。
图2示出了本发明中的量子点膜200的示意性截面图。量子点膜200包括量子点层201。量子点层201包括黏合剂201B和分散在黏合剂201B中的多个量子点201A。量子点层201的厚度可以在25μm至350μm的范围内。量子点层201具有第一主表面211和与第一主表面211相对的第二主表面212。
量子点201A在暴露于高温或高温时具有很高的稳定性,因此可以对量子点201A的表面进行特殊处理,以提高其抵抗水和氧气所引起的破坏;因此,量子点201A能够具有足够的防水性和抗氧性,而在量子点层201的第一主表面211和第二主表面212的每一个上/上均可以没有形成阻挡层。
量子点层201也可被自身支撑,而无需在量子点层201上形成支撑层。因此,黏合剂的材料应该选择量子点层201的201B,使得量子点层201能够被自身支撑而无需在量子点的第一主表面211和第二主表面212上形成支撑层。另外,应该选择量子点层201的黏合剂201B的材料,以保护量子点膜200中的量子点201A不受氧或水的损害。黏合剂201B的材料可以包括以下材料的至少一种:聚对苯二甲酸乙二酯(PET),聚萘二甲酸乙二酯(PEN),聚丙烯酸酯(PAR),聚碳酸酯(PC)和三乙酸纤维素(TAC)。优选地,该材料是聚对苯二甲酸乙二酯(PET)。黏合剂201B的材料可以可以是纯聚对苯二甲酸乙二酯(PET)。黏合剂201B的材料可以是单一的或均质的。
量子点201A可以包括绿色量子点和红色量子点。量子点201A的材料可以包括CdS,CdSe,CdTe,ZnSe,PbS,PbSe,InP,InAs,InGaP,ZnS或ZnTe,但是本发明不限于此。量子点201A的材料可以包括Cd(例如,CdSe)或不含Cd(例如,InP)。量子点201A的浓度可以在0.1%至20%的范围内,优选在0.3%至8%的范围内。
在一实施例中,量子点包括Cd。
在一实施例中,量子点中Cd的浓度为0.1-10%。
在一实施例中,量子点中Cd的浓度为0.3-2%。
在一实施例中,量子点层中的量子点的浓度为0.05-20%。
在一实施例中,量子点层中的量子点的浓度为0.05-8%。
在一实施例中,量子点膜的厚度为25-350um。
可选地,量子点膜200可以包括多个扩散粒子(未示出);进一步提供扩散颗粒以增加分散在黏合剂201B中的量子点201A的均匀性。扩散粒子的材料可以是有机的(例如,PMMA(聚甲基丙烯酸甲酯),PS的(聚苯乙烯),三聚氰胺)或无机的(例如,硅,SiO2,TiO2,CaCO3,Al2O3,ZrO2)。扩散颗粒的浓度可以在2%至40%的范围内,优选在5%至15%的范围内。
量子点层201的第一主表面211和第二主表面212中的每一个可以是结构化表面213、214(参见图3中的量子点膜250)。结构化表面213、214可用于减少不期望的光现象,例如牛顿环。哑光结构可以用于形成量子点层201的第一主表面211和第二主表面212中的每一个。
以下描述用于形成量子点膜200的制造方法。
用于形成量子点膜200的方法包括形成包括黏合剂201B和分散在黏合剂201B中的多个量子点201A的量子点层201。形成量子点层201包括对量子点201A和材料进行处理,使得多个量子点201A分散在黏合剂201B中。该过程可以是共挤出过程。
黏合剂201B的材料可包括第一部分和第二部分,其中量子点201A和黏合剂201B材料的第一部分被组合成第一组分,并且黏合剂201B材料的第二部分被形成第二组分,其中,对第一组分和第二组分进行处理,以使量子点201A分散在黏合剂201B中。该过程可以是共挤出过程。
为了便于说明,在本发明的实施方式A1中,黏合剂201B的材料可为聚对苯二甲酸乙二酯(PET),然而,本发明不限于此。在通过分散工艺将量子点201A均匀地分散之后,可以将量子点201A和PET的第一部分组合成第一组分(例如,通过双螺杆挤出机或微双螺杆挤出机)。第一组分(即,PET中的QD)可以是多个第一碎片的形式。第一组分可以具有高浓度的量子点201A。第一组分可以具有更好的发光效果和更好的发光均匀性。第二组分可以由纯PET或具有高浓度的PET制成。第二组分(即,PET)可以是多个第二碎片(即,PET碎片)的形式。可以基于它们的合适的质量比(例如,通过共挤出工艺)将第一组分和第二组分形成为量子点膜200。
在一实施例中,也可以将第一组分和第二组分组合成复合混合物(例如,通过双螺杆挤出机或微双螺杆挤出机),并对复合混合物进行该工艺,以使得量子点201A分散在黏合剂201B中。该复合混合物可以具有更好的发光效果和更好的发光均匀性。该过程可以是共挤出过程。黏合剂201B的材料可包括第一部分,第二部分和第三部分,其中量子点201A和材料的第一部分结合成第一组分,形成材料的第二组分后,将扩散粒子和材料的第三部分合并为第三组分,其中,对第一组分,第二组分和第三组分进行处理,以使量子点201A均匀分散在黏合剂201B中。该过程可以是共挤出过程。黏合剂201B的材料可为PET,然而,本发明不限于这种情况。在通过分散工艺将扩散颗粒均匀地分散之后,可以将扩散颗粒和PET的第三部分结合成第三组分(例如,通过双螺杆挤出机或微双螺杆挤出机)。第三组分(即,PET中的扩散颗粒)可以是多个第三碎片的形式。第三组分可以具有高浓度的扩散颗粒。基于其合适的质量比(例如,通过共挤出工艺),可以在本发明中将第一组分,第二组分和第三组分形成量子点膜200。将第一组分,第二组分和第三组分合并到复合混合物中(例如,通过双螺杆挤出机或微双螺杆挤出机),其中对复合混合物进行处理以使得量子点201A均匀地分散在黏合剂201B中。该复合混合物可以具有更好的发光效果和更好的发光均匀性。该过程可以是共挤出过程。
量子点201A可以包括绿色量子点和红色量子点。可以将绿色量子点和一部分PET组合成第一组分(例如,通过双螺杆挤出机或微双螺杆挤出机)。可以将红色量子点和另一部分PET合并为第二组分(例如,通过双螺杆挤出机或微双螺杆挤出机)。该过程可以是共挤压过程,该共挤压过程是用于膜形成的拉伸形成技术之一。拉伸成形技术可以是双轴拉伸成形技术。共挤出是将两种或多种各自具有特性Xi的塑料材料挤出并组合以形成具有特性X1,X2,…XN的组合的结构的过程(N为整数且大于1)两种或多种塑料材料。当在实施例A1中通过使用两种塑料材料执行共挤出工艺时,一种塑料材料可以是第一组分,另一种塑料材料可以是第二组分。
扩散颗粒的材料可以是PMMA;然而,本发明不限于这种情况。将PET碎片放在烤箱中,并在100℃下干燥PET碎片24小时。将PMMA珠放入烤箱中,并在100℃下干燥PMMA珠24小时。准备具有绿色量子点和PET碎片的第一混合物。绿色量子点的质量为8g,PET碎片的质量为72g。将第一混合物预均匀,然后将第一混合物放入双螺杆挤出机(或微型双螺杆挤出机或微型挤出机)中。在双螺杆挤出机中(在高剪切力下)于280℃下对第一混合物进行热分散(或纳米分散)过程10分钟,以形成第一组分(即PET中的GQD)。第一组分可以具有高浓度的绿色量子点。准备具有红色量子点和PET碎片的第二种混合物。红色量子点的质量为20g,PET碎片的质量为72g。将第二种混合物预均匀,然后将第二种混合物放入双螺杆挤出机(或微型双螺杆挤出机或微型挤出机)中。在双螺杆挤出机中于280℃下对第二混合物进行热分散(或纳米分散)过程(通过高剪切力)达10分钟,以形成第二组分(即PET中的RQD)。第二组分可以具有高浓度的红色量子点。准备具有PMMA珠粒和PET碎片的第三种混合物。PMMA珠的质量为32g,PET碎片的质量为48g。将第三种混合物预均匀,然后将第三种混合物放入双螺杆挤出机(或微型双螺杆挤出机或微型挤出机)中。在双螺杆挤出机中(在高剪切力下)于280℃下对第三种混合物进行热分散(或纳米分散)过程10分钟,以形成第三组分(即PET中的PMMA)。制备具有第一组分(即PET中的GQD),第二组分(即PET中的RQD),第三组分(即PET中的PMMA)和第二组分(即PET碎片)的第四混合物。第一组分的质量为13g,第二组分的质量为6g,第三组分的质量为16g,第二组分的质量为30g。将第四种混合物放入双螺杆挤出机(或微型双螺杆挤出机或微型挤出机)中。在双螺杆挤出机中于280℃下对第四种混合物进行热分散(或纳米分散)过程(由于高剪切力),持续10分钟以形成复合混合物。最终,通过热板将复合混合物形成为量子点膜200。
在一实施例中,通过微双螺杆挤出机纳米分散处理技术将多个量子点分散到PET的颗粒之间的空间中。
在一实施例中,使用PET共挤出和双轴拉伸技术来形成PET量子点光学膜。PET量子点光学膜不需要额外的阻气膜(阻气膜),并且仍可以达到相同的抗环境测试水平。
图4示出了形成量子点膜的方法,在步骤S401中,对多个量子点进行处理以使多个量子点具有耐水与耐氧性。在步骤S402中,形成包括黏合剂和分散在该黏合剂中的多个量子点的量子点层,其中该多个量子点能够耐水与耐氧。
图5A至图5B示出了本发明中的量子点膜200的光致发光性能。
表1(如下所示)示出了现有技术中的量子点膜100(参见图1)与本发明的量子点膜200(请参见图2)。
表1
本发明具有以下优点:
1.当拉伸并形成PET时,将具有高的热稳定性和具有耐水与耐氧性的表面改性的QD颗粒分散到PET中以产生PET量子点。光学膜材料,达到有效简化生产工艺并减薄的目的;
2.由于对QD颗粒进行了耐水和抗氧的表面改性,因此无需使用昂贵的阻气膜即可降低总体成本,并扩大了量子点光学膜材料在不同领域的应用。
虽然本发明以前述的较佳实施例揭露如上,然其并非用以限定本发明,任何本领域技术人员,在不脱离本发明的精神和范围内,当可作些许的更动与润饰。虽然在上述描述说明中并无完全揭露这些可能的更动与替代,而接着本说明书所附的专利保护范围实质上已经涵盖所有这些方案。
Claims (19)
1.一种量子点膜,包括一量子点层,其特征在于,该量子点层包括多个量子点,其中,所述多个量子点分散在所述量子点层中,其中所述多个量子点能够耐水与耐氧。
2.根据权利要求1所述的量子点膜,其特征在于,在所述量子点层的上方没有设置用于保护所述多个量子点不受水或氧影响的阻挡层。
3.根据权利要求1所述的量子点膜,其特征在于,所述量子点层还包含多个扩散粒子。
4.根据权利要求1所述的量子点膜,其特征在于,所述量子点层的量子点的浓度为0.05-20%。
5.根据权利要求1所述的量子点膜,其特征在于,所述量子点层中的量子点的浓度为0.05-8%。
6.根据权利要求1所述的量子点膜,其特征在于,所述量子点层的厚度为25-350μm。
7.根据权利要求1所述的量子点膜,其特征在于,所述黏合剂包括以下材料的至少一种:聚对苯二甲酸乙二酯(PET),聚萘二甲酸乙二酯(PEN),聚丙烯酸酯(PAR),聚碳酸酯(PC)和三乙酸纤维素(TAC)。
8.根据权利要求1所述的量子点膜,其特征在于,所述量子点膜的上表面具有包括一结构化表面。
9.根据权利要求1所述的量子点膜,其特征在于,所述多个量子点均匀分散在所述量子点层中。
10.一种光学膜,包括一量子点层,其特征在于,该量子点层包括多个量子点,其中,所述多个量子点分散在所述量子点层中,其中所述多个量子点能够耐水与耐氧。
11.根据权利要求10所述的光学膜,其特征在于,在所述量子点层上没有设置用于保护所述多个量子点不受水或氧影响的阻挡层。
12.根据权利要求10所述的光学膜,其特征在于,所述量子点层还包含多个扩散粒子。
13.根据权利要求10所述的光学膜,其特征在于,所述量子点层中的量子点的浓度为0.05-20%。
14.根据权利要求10所述的光学膜,其特征在于,所述量子点层中的量子点的浓度为0.05-8%。
15.根据权利要求10所述的光学膜,其特征在于,所述量子点膜的厚度厚度为25-350μm。
16.根据权利要求10所述的光学膜,其特征在于,所述量子点层包括以下材料的至少一种:聚对苯二甲酸乙二酯(PET),聚萘二甲酸乙二酯(PEN),聚丙烯酸酯(PAR),聚碳酸酯(PC)或三乙酸纤维素(TAC)。
17.一种形成量子点膜的方法,其特征在于,包括以下步骤:
对多个量子点进行处理,以使多个量子点具有耐水和抗氧性;以及
形成一量子点层,其中包括一黏合剂和分散在黏合剂中的该多个量子点量,其中该多个量子点能够耐水与耐氧。
18.根据权利要求17所述的方法,其特征在于,所述黏合剂包括聚对苯二甲酸乙二酯(PET),其中,所述多个量子点通过微双螺杆挤出机纳米分散处理技术分散在所述聚对苯二甲酸乙二酯(PET)中,以形成一聚对苯二甲酸乙二酯(PET)量子点光学膜。
19.根据权利要求17所述的方法,其特征在于,所述方法还包括使用共挤出和双轴拉伸技术以形成一聚对苯二甲酸乙二酯(PET)量子点光学膜。
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