CN111808603A - 一种量子点膜及其制备方法、显示装置 - Google Patents
一种量子点膜及其制备方法、显示装置 Download PDFInfo
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- CN111808603A CN111808603A CN202010669010.XA CN202010669010A CN111808603A CN 111808603 A CN111808603 A CN 111808603A CN 202010669010 A CN202010669010 A CN 202010669010A CN 111808603 A CN111808603 A CN 111808603A
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Abstract
本揭示提供一种量子点膜及其制备方法以及显示装置。所述量子点膜包括量子点层及沉积在量子点层上表面和下表面上的保护层。所述量子点层包括均匀分散在高分子聚合物基材中的红色量子点、绿色量子点及散射粒子。散射粒子为粒径在200纳米至1毫米之间的高折射率的无机半导体材料。通过在量子点层设置高折射率的散射粒子,以降低量子点之间的自吸收现象,提升光取出率。
Description
技术领域
本揭示涉及显示技术领域,尤其涉及一种量子点膜及其制备方法以及显示装置。
背景技术
量子点(Quantum Dots,QDs)是一种半导体纳米晶体,可以通过调节量子点的尺寸来改变它的能带结构,因而受到光源的激发后,可以发射出不同波长的光线。因此量子点作为一类发光效率高、色谱纯度高、发光波长可调的发光材料,受到人们广泛的关注。随着量子点合成技术的逐渐成熟,其应用也愈加广泛,例如,目前多将量子点与树脂混合制成量子点增亮膜,将其应用于薄膜晶体管液晶显示器件(Thin Film Transistor Liquid CrystalDisplay,TFT-LCD)中可以大幅度提高液晶显示器的色域和色彩表现力。可将一款NTSC为70%左右的液晶产品的色域提升至90%以上,甚至超过100%。但是由于量子点合成方面的多重因素导致量子点原料的成本较高,此外由于发光强度的要求,量子点增量膜中量子点的浓度较高,量子点间距较小,量子点受激发后的发光会被其他量子点吸收,即量子点自吸收现象,从而无法出射,导致能量的浪费,这些阻碍了量子点在产品上的应用。
因此,现有量子点膜存在量子点自吸收的问题需要解决。
发明内容
本揭示提供一种量子点膜及其制备方法以及显示装置,以缓解现有量子点膜存在量子点自吸收的技术问题。
为解决上述问题,本揭示提供的技术方案如下:
本揭示实施例提供一种量子点膜,其包括量子点层,所述量子点层包括量子点以及散射粒子。所述散射粒子分散于所述量子点之间。其中,所述散射粒子的粒径范围为200纳米至1微米。
在本揭示实施例提供的量子点膜中,所述散射粒子的材料包括二氧化钛、二氧化锆。
在本揭示实施例提供的量子点膜中,所述量子点包括红色量子点、绿色量子点。
在本揭示实施例提供的量子点膜中,所述量子点膜还包括保护层,所述保护层设置于所述量子点层的上表面和下表面。
本揭示实施例提供一种量子点膜制备方法,其包括以下步骤:步骤S10、制备量子点层,包括把量子点、散射粒子分散在高分子聚合物溶液中形成量子点胶液,并对所述量子点胶液进行固化成膜,形成量子点层。步骤S20、制备保护层,包括分别在所述量子点层的上表面和下表面沉积一层无机薄膜作为保护层。
在本揭示实施例提供的量子点膜制备方法中,所述量子点包括红色量子点、绿色量子点。
在本揭示实施例提供的量子点膜制备方法中,所述散射粒子的粒径范围为200纳米至1微米。
在本揭示实施例提供的量子点膜制备方法中,所述散射粒子的材料包括二氧化钛、二氧化锆。
在本揭示实施例提供的量子点膜制备方法中,所述高分子聚合物包括有机硅树脂、环氧树脂、聚丙烯酰胺、丙烯酸系树脂、光固化树脂、热固化树脂中的一种或多种。
本揭示实施例还提供一种显示装置,其包括前述实施例其中之一的量子点膜。
本揭示的有益效果为:本揭示提供的量子点膜及其制备方法以及显示装置中,在量子点层中加入粒径为200纳米至1微米左右的高折射率的散射粒子。散射粒子可撑开量子点之间的相互距离,从而可以降低量子点之间的自吸收现象,提升光取出率。而且由于高折射率散射粒子的存在,蓝光在经过散射粒子时会被散射,从而增加了蓝光在量子点增亮膜中的光路,提升了蓝光的利用率,进而提升量子点光效,减少量子点用量,降低成本。同时由于蓝光受到散射粒子的散射作用,其光型被打散,从而提高了蓝光从量子点增亮膜中出射的角度,使蓝光光型增加,进而减小红绿蓝光型差异,减小色偏。
附图说明
为了更清楚地说明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单介绍,显而易见地,下面描述中的附图仅仅是发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1为本揭示实施例提供的量子点膜的侧视结构示意图;
图2为本揭示实施例提供的量子点膜改变光程的结构示意图;
图3为本揭示实施例提供的量子点膜制备方法的流程示意图;
图4为本揭示实施例提供的液晶显示装置的侧视结构示意图;
图5为本揭示实施例提供的OLED显示装置的侧视结构示意图。
具体实施方式
以下各实施例的说明是参考附加的图示,用以例示本揭示可用以实施的特定实施例。本揭示所提到的方向用语,例如[上]、[下]、[前]、[后]、[左]、[右]、[内]、[外]、[侧面]等,仅是参考附加图式的方向。因此,使用的方向用语是用以说明及理解本揭示,而非用以限制本揭示。在图中,结构相似的单元是用以相同标号表示。
在一种实施例中,提供一种量子点膜100,如图1所示,所述量子点膜100包括量子点层10及设置于所述量子点层10的上表面和下表面的保护层20。所述量子点层10包括高分子聚合物基材13及均匀分散在所述高分子聚合物基材13中的量子点11和散射粒子12。
具体的,所述量子点11是由半导体材料构成的核壳结构,包括量子点中心核和外层壳。量子点的材质包括MgS、CdTe、CdSe、CdS、CdZnS、ZnSe、ZnTe、ZnS、ZnO、GaAs、GaN、GaP、InP、InAs、InN、InSb、AlP、AlSb等中的一种或多种。例如中心核是CdSe核,外层壳是ZnS壳。量子点11的粒径一般在10纳米左右,由于量子点尺寸的不同,量子点11的发射光波长随粒径和组成成分的不同而产生变化。
进一步的,所述量子点11包括红色量子点112和绿色量子点111,绿色量子点111的粒径较小,红色量子点112的粒径较大。红色量子点112受光激发发射红光,绿色量子点111受光激发发射绿光。本揭示的使用的激发光包括蓝光,可以使用蓝光LED作为激发光光源。红光、绿光、蓝光混合成白光从量子点层出射。
需要说明的是,量子点11可以将吸收的短波长的光转换为较长波长的光,为得到预定颜色的量子点膜,量子层中的量子点可以包括一种或者多种,本揭示中量子点不仅限于发射红光、绿光的量子点,还包括发射位于可见光波长范围内任意波长的量子点。
进一步的,把粒径范围为200纳米至1微米的所述散射粒子12与所述量子点11一块混合在所述高分子聚合物溶液中,并经固化成膜形成量子点层10。所述散射粒子12可撑开所述量子点11之间的相互距离,从而可以降低量子点11之间的自吸收现象,提升光取出率。
进一步的,所述散射粒子12的材料包括二氧化钛、二氧化锆等高折射率的无机半导体材料。不同折射率的材料对光的散射强度不同,折射率越大,其散射强度越大。当激发光照射到高折射率的散射粒子时,激发光会被散射粒子散射,散射的光线可以再次去激发量子点,从而增加了激发光在量子点增亮膜中的光路,提升了蓝光的利用率,进而提升量子点光效,减少量子点用量,降低成本。
进一步的,所述高分子聚合物基材13是所述高分子聚合物溶液固化后形成。所述高分子聚合物溶液是高分子聚合物掺杂在有机溶剂中形成。所述高分子聚合物包括有机硅树脂、环氧树脂、聚丙烯酰胺、丙烯酸系树脂、光固化树脂、热固化树脂等高分子材料中的一种或多种。例如所述高分子聚合物基材可以为聚对苯二甲酸乙二醇酯(Poly ethyleneterephthalate,PET)、三醋酸纤维素(Triacetate cellulose,TAC)等。
进一步的,在所述量子点层10的上表面和下表面分别沉积一层保护层20,形成量子点膜100,所述保护层20用于阻隔水氧入侵所述量子点层10。所述保护层20的材料可以选用阻隔水氧能力强的无机材料等。无机材料在原子级别的致密排列能够有效阻挡水气和氧气。无机材料包括氮化铝、氮氧化铝、氮化钛、氮氧化钛、氮化锆、氮氧化锆、氧化硅、氮化硅、氮氧化硅、石墨烯等中的至少一种。
需要说明的是,所述量子点层10的上表面指量子点层10的出光面,所述量子点层10的下表面指量子点层10的入光面,也即激发光光源照射的一面。
进一步的,如图2所示,蓝色LED发射的蓝光以一定的视角a入射到量子点膜100,量子点膜中红色量子点受蓝光的激发,发射出红光,所述红光以一定的视角b从量子点膜的出光面出射。量子点膜中绿色量子点受蓝光的激发,发射出绿光,所述绿光也以一定的视角c从量子点膜的出光面出射。同时蓝光受到量子点膜中散射粒子的散射作用,其光型被打散,以一定的视角d从量子点层的出光面出射,其中视角b大于视角a,视角c大于视角a,视角d大于视角a。由于高折射率的散射粒子的存在,使蓝光经过量子点膜后的出射角大于入射角,从而提高了蓝光从量子点增亮膜中出射的角度,使蓝光光型增加,进而减小红绿蓝光型差异,减小色偏。
在一种实施例中,提供一种量子点膜的制备方法,如图3所示,其包括以下步骤:
步骤S10、制备量子点层,包括把量子点、散射粒子分散在高分子聚合物溶液中形成量子点胶液,并对所述量子点胶液进行固化成膜,形成量子点层。
具体的,所述量子点包括红色量子点和绿色量子点等。所述散射粒子包括粒径范围在200纳米至1毫米之间的高折射率的无机半导体材料,例如可以为二氧化钛、二氧化锆等高折射率的无机半导体材料。
进一步的,把所述量子点和所述散射粒子混合在高分子聚合物溶液中形成量子点胶液。
具体的,高分子聚合物溶液是把高分子聚合物掺杂在有机溶剂中形成。所述所述高分子聚合物包括有机硅树脂、环氧树脂、聚丙烯酰胺、丙烯酸系树脂、光固化树脂、热固化树脂等高分子材料中的一种或多种。
进一步的,对所述量子点胶液进行固化处理,形成量子点膜。具体的,可以通过紫外光照射、加热、蒸发溶剂或者添加固化剂等方式固化。例如,当高分子聚合物溶液为环氧树脂时,量子点胶液一般通过添加酸酐类、酸类或者胺类固化剂固化。当高分子聚合物溶液为丙烯酸树脂时,量子点胶液一般通过紫外光照射或者加热的方式固化。
可以理解的是,在对所述量子点胶液进行固化时需借助辅助基材,把混合后的量子点胶液通过涂布等方式涂覆在所述辅助基材上,然后进行固化成膜。最后在剥离掉辅助基材,制得需要的量子点层。所述辅助基材可以选用易剥离的离型膜基材,例如可以为PET离型膜、PC离型膜等。
步骤S20、制备保护层,包括分别在所述量子点层的上表面和下表面沉积一层无机薄膜作为保护层。
具体的,采用化学气相沉积法(Chemical Vapor Deposition,CVD)、等离子体增强化学气相沉积法(Plasma Enhance Chemical Vapor Deposition,PECVD)、原子层沉积法(Atomic layer deposition,ALD)等沉积工艺在所述量子点层的上表面和下表面各沉积一层无机薄膜作为保护层。
具体的,所述无机薄膜的材料包括氮化铝、氮氧化铝、氮化钛、氮氧化钛、氮化锆、氮氧化锆、氧化硅、氮化硅、氮氧化硅、石墨烯等中的至少一种。所述无机薄膜能够有效阻挡水气和氧气入侵所述量子点层。
在一种实施例中,提供一种液晶显示装置1000,如图4所示,所述液晶显示装置1000包括背光模组200、位于背光模组200上的液晶显示面板300、设置于所述背光模组200及所述液晶显示面板300之间且贴附于所述液晶面板300下表面的下偏光片400以及贴附在所述液晶显示面板300上表面的上偏光片500。
具体的,所述背光模组200包括背板201、反射片202、导光板203、光源204、光学膜片205以及上述实施例其中之一的量子点膜100。所述背板201形成有容纳腔。所述容纳腔用于容纳所述反射片202、所述导光板203、所述光源204、所述光学膜片205以及所述量子点膜100。所述光源204包括蓝光LED等,且所述光源204设置于所述导光板203的一侧。所述量子点膜100设置于所述导光板203的上方,也即设置于所述导光板203的出光面。所述光学膜片205设置于所述量子点膜100的上方。所述反射片102设置于所述导光板203的下表面。
具体的,所述蓝光LED发出的蓝光射向所述导光板203,在所述导光板203中经过反射、折射等从所述导光板203的出光面射出。从所述导光板203出射的光线在经过所述量子点膜100,所述量子点膜100中的红色量子点受蓝光激发发射出红光,绿色量子点受蓝光激发发射出绿光,红光、绿光、蓝光混合成白光从所述量子点膜100的出光面射出。
进一步的,当从所述导光板203出射的蓝光照射到量子点膜100中的高折射率的散射粒子时,蓝光会被散射粒子散射,散射的光线可以再次去激发量子点,从而增加了蓝光在量子点膜中的光路,提升了蓝光的利用率,进而提升量子点光效,减少量子点用量,降低成本。同时蓝光受到量子点层中散射粒子的散射作用,其光型被打散,以一定的视角从量子点层的出光面出射,从而提高了蓝光从量子点增亮膜中出射的角度,使蓝光光型增加,进而减小红绿蓝光型差异,减小液晶显示面板的色偏。
需要说明的是,所述背光模组200也可以采用直下式背光,且所述量子点膜100不限于设置在所述导光板203上,所述量子点膜还可以与所述光源相对设置、或贴附在所述下偏光片上等。
在另一种实施例中,提供一种OLED显示装置1001,如图5所示,所述OLED显示装置1001包括基板600、驱动电路层700、发光功能层800、封装层900、彩色滤光片110、以及上述实施例其中之一的量子点膜100。其中所述驱动电路层700设置于所述基板600上。所述发光功能层800设置于所述驱动电路层700上,所述发光功能层800的发光材料为蓝色发光材料,用于发射蓝光。所述量子点膜100设置于所述发光功能层800上。所述彩色滤光片110设置于所述量子点膜100上。所述封装层900设置于所述彩色偏光片110上方。
具体的,所述发光功能层发出的蓝光在经过所述量子点膜时,所述量子点膜中的红色量子点受蓝光激发发射出红光,绿色量子点受蓝光激发发射出绿光,红光、绿光、蓝光混合成白光从所述量子点膜的出光面射出。从所述量子点膜的出光面出射的白光再经过彩色偏光片以呈现各种色彩。
根据上述实施例可知:
本揭示提供一种量子点膜及其制备方法以及显示装置,所述量子点膜包括量子点层及沉积在量子点层上表面和下表面上的保护层。所述量子点层包括均匀分散在高分子聚合物基材中的红色量子点、绿色量子点及散射粒子。散射粒子为粒径在200纳米至1毫米之间的高折射率的无机半导体材料。散射粒子可撑开量子点之间的相互距离,从而可以降低量子点之间的自吸收现象,提升光取出率。而且由于高折射率的散射粒子的存在,蓝光在经过散射粒子时会被散射,从而增加了蓝光在量子点增亮膜中的光路,提升了蓝光的利用率,进而提升量子点光效,减少量子点用量,降低成本。同时由于蓝光受到散射粒子的散射作用,其光型被打散,从而提高了蓝光从量子点增亮膜中出射的角度,使蓝光光型增加,进而减小红绿蓝光型差异,减小色偏。
综上所述,虽然本揭示已以优选实施例揭露如上,但上述优选实施例并非用以限制本揭示,本领域的普通技术人员,在不脱离本揭示的精神和范围内,均可作各种更动与润饰,因此本揭示的保护范围以权利要求界定的范围为准。
Claims (10)
1.一种量子点膜,其特征在于,包括量子点层,所述量子点层包括:
量子点;以及
散射粒子,所述散射粒子分散于所述量子点之间;
其中,所述散射粒子的粒径范围为200纳米至1微米。
2.根据权利要求1所述的量子点膜,其特征在于,所述散射粒子的材料包括二氧化钛、二氧化锆。
3.根据权利要求1所述的量子点膜,其特征在于,所述量子点包括红色量子点、绿色量子点。
4.根据权利要求1所述的量子点膜,其特征在于,所述量子点膜还包括保护层,所述保护层设置于所述量子点层的上表面和下表面。
5.一种量子点膜的制备方法,其特征在于,包括以下步骤:
步骤S10、制备量子点层,包括把量子点、散射粒子分散在高分子聚合物溶液中形成量子点胶液,并对所述量子点胶液进行固化成膜,形成量子点层;以及
步骤S20、制备保护层,包括分别在所述量子点层的上表面和下表面沉积一层无机薄膜作为保护层。
6.根据权利要求5所述的量子点膜的制备方法,其特征在于,所述量子点包括红色量子点、绿色量子点。
7.根据权利要求5所述的量子点膜的制备方法,其特征在于,所述散射粒子的粒径范围为200纳米至1微米。
8.根据权利要求6所述的量子点膜的制备方法,其特征在于,所述散射粒子的材料包括二氧化钛、二氧化锆。
9.根据权利要求5所述的量子点膜的制备方法,其特征在于,所述高分子聚合物包括有机硅树脂、环氧树脂、聚丙烯酰胺、丙烯酸系树脂、光固化树脂、热固化树脂中的一种或多种。
10.一种显示装置,其特征在于,包括如权利要求1至4任一项所述的量子点膜。
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