CN111040514A - 量子点墨水、显示面板制作方法及显示面板 - Google Patents
量子点墨水、显示面板制作方法及显示面板 Download PDFInfo
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Abstract
本发明提供一种量子点墨水、显示面板的制作方法及显示面板,所述量子点墨水包括有机溶剂、以及分散于所述有机溶剂中的量子点,所述量子点包括发光型量子点和阻挡型量子点;本发明通过在所述量子点墨水中添加阻挡型量子点,抑制所述量子点墨水在喷墨打印过程中的扩散作用,防止出现咖啡环效应,提高了量子点膜面的平整性和均一性,使所述显示面板表现出优异的显示品质。
Description
技术领域
本发明涉及显示技术领域,尤其涉及一种量子点墨水、显示面板制作方法及显示面板。
背景技术
量子点发光二极管显示装置是一种不需要背光源的自发光显示技术,不仅兼具有机发光二极管显示装置的能耗低、超薄、视角广、色彩表现力强、工作温度范围宽、易于实现柔性显示等优点,还具有更窄的发光峰、更高的色彩饱和度等优势,因而具有广泛的应用前景。
喷墨打印技术是量子点发光二极管显示装置制作过程中的关键技术,通过喷墨打印技术形成的量子点层的均一性的优劣直接影响显示装置的显示质量。在量子点层制作的过程中,包含量子点的墨水通过打印喷头滴入指定区域,由于液态墨水的流动性,量子点墨水会向周围扩散,并在扩散过程中不断固化,从而形成环状不平整的量子点层膜面,即出现“咖啡环效应”。现有技术采用改进喷墨打印的工艺参数的方法来改善“咖啡环效应”,但是由于不能从根本上抑制量子点墨水的流动性,而导致改善效果有限。
因此,为了制备高品质的量子点发光二极管显示装置,需要从根本上消除“咖啡环效应”。
发明内容
基于上述现有技术中的不足,本发明提供了一种量子点墨水,通过在所述量子点墨水中加入阻挡型量子点,抑制喷墨打印过程中量子点墨水的扩散作用,从而从根本上解决量子点膜面的“咖啡环效应”;基于所述量子点墨水,本发明还提供了一种显示面板的制作方法及显示面板。
本发明提供了一种量子点墨水,包括有机溶剂、以及分散于所述有机溶剂中的量子点,所述量子点包括发光型量子点和阻挡型量子点。
根据本发明一实施例,所述发光型量子点为球形量子点。
根据本发明一实施例,所述阻挡型量子点为椭球形量子点或圆柱体形量子点。
根据本发明一实施例,所述发光型量子点在所述量子点墨水中的质量分数为0.1%~10%,所述阻挡型量子点的质量占所述发光型量子点的质量的1%~20%。
根据本发明一实施例,所述有机溶剂为芳香烃类、醚类、醇类中的一种或多种,所述量子点的材料是Ⅱ-Ⅵ型量子点材料、Ⅲ-Ⅴ型量子点材料、Ⅳ-Ⅵ型量子点材料中的一种或多种。
根据本发明一实施例,所述量子点墨水还包括表面张力调节剂和粘度调节剂。
本发明还提供了一种显示面板制作方法,包括以下步骤:
在一基板上制作阵列层;
在所述阵列层上制作发光层,所述发光层包括量子点层,所述量子点层由本发明提供的量子点墨水通过喷墨打印制作而成;
在所述发光层上制作盖板。
根据本发明一实施例,所述在所述阵列层上制作发光层的步骤包括:
在所述阵列层上制作阳极层;
在所述阳极层上制作空穴注入层;
在所述空穴注入层上制作空穴传输层;
在所述空穴传输层上制作所述量子点层;
在所述量子点层上制作电子传输层;
在所述电子传输层上制作电子注入层;
在所述电子注入层上制作阴极。
根据本发明一实施例,所述量子点层的制作方法包括以下步骤:
配制本发明提供的量子点墨水;
使用喷墨打印设备将所述量子点墨水注入所述显示面板的指定区域;
对所述显示面板进行干燥处理,以去除所述量子点墨水中的所述有机溶剂,得到所述量子点层。
本发明又提供了一种显示面板,包括阵列基板、设置于所述阵列基板上的发光层、以及设置于所述发光层上的盖板;
所述发光层包括量子点层,所述量子点层由本发明提供的量子点墨水通过喷墨打印制作而成。
本发明的有益效果是:本发明提供一种量子点墨水、及使用该量子点墨水制作显示面板的方法、以及使用该量子点墨水制作而成的显示面板,通过在所述量子点墨水中添加阻挡型量子点,抑制所述量子点墨水在喷墨打印过程中的扩散作用,防止出现咖啡环效应,提高了量子点膜面的平整性和均一性,使所述显示面板表现出优异的显示品质。
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是本发明实施例提供的使用喷墨打印设备打印量子点膜面的示意图,其中,喷墨打印设备中所使用的量子点墨水是本发明实施例提供的量子点墨水;
图2是本发明实施例提供的显示面板结构示意图;
图3是本发明实施例提供的显示面板制作方法流程图;
图4是本发明实施例提供的发光层的制作方法流程图。
具体实施方式
以下各实施例的说明是参考附加的图示,用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语,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发明,而非用以限制本发明。在图中,结构相似的单元是用以相同标号表示。
本发明实施例提供一种量子点墨水、及使用该量子点墨水制作显示面板的方法、以及使用该量子点墨水制作而成的显示面板。通过在所述量子点墨水中添加阻挡型量子点,抑制所述量子点墨水在喷墨打印过程中的扩散作用,从而消除最终形成的量子点膜面的咖啡环效应,提高量子点膜面的均一性。本发明实施例提供的显示面板制作方法可以制作出高品质的显示面板。
图1是本发明实施例提供的使用喷墨打印设备13打印量子点膜面的示意图,其中,喷墨打印设备13中所使用的量子点墨水是本发明实施例提供的量子点墨水11。参考图1所示,本发明实施例提供的量子点墨水11包括有机溶剂、以及分散于所述有机溶剂中的量子点12,所述量子点12包括发光型量子点121和阻挡型量子点122。需要说明的是,所述量子点12是一种尺寸在纳米或微米级别的可发光晶体,其具有独特的光电特性,在光或电的刺激作用下可以发射高品质光线;所述发光型量子点121可利用其本身的光电特性发射光线,是所述量子点墨水11中的发光晶体;所述阻挡型量子点122虽然本身也由量子点材料制成,但是所述阻挡型量子点122的能带宽于所述发光型量子点121的能带,因此用于激发所述发光型量子点121的能量无法激发所述阻挡型量子点122发光,即所述阻挡型量子点122不参与发光;所述阻挡型量子点122本身具有特殊的形状,在液体中流动的能力较差,因而可以阻挡所述量子点墨水11的扩散。
如图1所示,使用所述喷墨打印设备13向一基板14表面打印量子点膜层过程中,所述量子点墨水11滴落到所述基板14上后,由于液体的流动性,会产生向四周扩散的趋势,而位于墨滴边缘的所述阻挡型量子点122会限制液滴的扩散,从而将所述量子点墨水11固定在打印区域,消除因墨滴扩散而出现的咖啡环效应,进而制得平整均一的量子点膜面。应当理解的是,所述基板14可以是需要制作量子点膜面的任何表面,例如可以是量子点发光二极管中的发光层表面。
可选地,所述发光型量子点121为球形量子点,应当理解的是,具有球形结构的所述发光型量子点121在受到光或电的刺激下可以产生均匀高品质的光线。
可选地,所述阻挡型量子点122为椭球形量子点或圆柱体形量子点,应当理解的是,具有椭球形或圆柱体形结构的所述阻挡型量子点122,由于其结构上存在长轴和短轴的差异,在其沿长轴滚动的过程中会引起自身势能的增加,从最低能量原理出发,所述阻挡型量子点122不具有向四周扩散的趋势。所述量子点墨水11中的其它成分也会受到所述阻挡型量子点122的阻挡作用而无法扩散,从而消除所述量子点墨水11固化过程中的咖啡环效应。
可选地,所述量子点墨水11中的有机溶剂可以是芳香烃类、醚类、醇类中的一种或多种;所述量子点12的材料可以是Ⅱ-Ⅵ型量子点材料、Ⅲ-Ⅴ型量子点材料、Ⅳ-Ⅵ型量子点材料中的一种或多种,例如所述量子点12的材料可以是硒化镉、磷化铟、硫化铅等化合物中的一种或多种。所述发光型量子点121的材料与所述阻挡型量子点122的材料可以相同,也可以不同。
可选地,所述量子点墨水11中还包括表面张力调节剂和粘度调节剂,其中表面张力调节剂用于调节所述量子点墨水11对所述基板14表面的润湿性,使所述量子点墨水11可以很好的铺展于所述基板14的表面;粘度调节剂用于调节所述量子点墨水11的自身粘度,以保证所述喷墨打印设备13喷出墨滴的连续性和稳定性。
可选地,在所述量子点墨水中,所述发光型量子点121的质量分数为0.1%~10%,所述阻挡型量子点122的质量占所述发光型量子点的质量的1%~20%。上述成分配比可以在保证最终形成的量子点膜层功能最优的前提下,充分发挥所述阻挡型量子点122对墨滴扩散的阻挡作用。
综上所述,本发明实施例提供的量子点墨水包括发光型量子点和阻挡型量子点,在喷墨打印过程中,所述阻挡型量子点可以抑制所述量子点墨水的扩散作用,从而从根本上消除最终制得的量子点膜面的咖啡环效应,提高量子点膜面的均一性。
本发明实施例还提供了一种显示面板的制作方法,如图3所示,所述显示面板的制作方法包括以下步骤:
步骤S1、参考图2所示,在一基板上制作阵列层,形成阵列基板21。
可选地,所述基板可以是玻璃基板或聚酰亚胺基板,所述阵列层可以包括用于信号传输和控制的数据线、扫描线、薄膜晶体管和控制电极等元件;制作所述阵列基板21的工艺包括化学气相沉积工艺和干法/湿法刻蚀工艺。所述阵列基板21用于为最终制得的所述显示面板提供数据信号和控制信号。
步骤S2、参考图2所示,在所述阵列层上制作发光层22,所述发光层22包括量子点层224,所述量子点层224通过喷墨打印制作而成。
具体地,采用喷墨打印的方法制作所述量子点层224所使用的墨水为上述实施例提供的量子点墨水。由于所述量子点墨水包括发光型量子点和阻挡型量子点,在喷墨打印过程中,所述阻挡型量子点可以抑制所述量子点墨水的扩散作用,提高制得的所述量子点层的平整性和均一性。
进一步地,参考图2和图4所示,制作所述发光层22的方法包括以下步骤:
步骤S201.在所述阵列层上制作阳极层221。
可选地,所述阳极层221通过化学气相沉积工艺制得,所述阳极层221可以是氧化铟锡电极,所述阳极层221用于产生所述发光层22发光所需的空穴粒子。
步骤S202.在所述阳极层221上制作空穴注入层222。
可选地,所述空穴注入层222的材料可以是氧化钼,应当理解的是,所述空穴注入层222用于匹配所述阳极层221与空穴传输层223之间的势垒,保证空穴粒子顺利传输至所述空穴传输层223。
步骤S203.在所述空穴注入层222上制作所述空穴传输层223。
所述空穴传输层223由具有高空穴迁移率的材料制作而成,所述空穴传输层223用于将空穴粒子传输至所述量子点层224中。
步骤S204.在所述空穴传输层223上制作所述量子点层224。
具体地,制作所述量子点层224的方法包括以下步骤:
配制本发明上述实施例所述的量子点墨水;所述量子点墨水包括发光型量子点和阻挡型量子点,所述发光型量子点用于在光或电的诱发下发光,所述阻挡型量子点用于在喷墨打印过程中阻挡量子点液滴的扩散,防止出现咖啡环效应。
使用喷墨打印设备将所述量子点墨水注入所述空穴传输层223上的指定区域;应当理解的是,在喷墨打印过程中,所述量子点墨水以液滴的状态滴入所述空穴传输层223上的确定位置,因为所述量子点墨水中包含所述阻挡型量子点,量子点液滴在到达所述空穴传输层223后,会保持稳定的聚集状态而不发生扩散。
对所述显示面板进行干燥处理,以去除所述量子点墨水中的所述有机溶剂,得到所述量子点层224;其中干燥处理可以是常温干燥处理或高温干燥处理,经过干燥处理后,液态的量子点墨水固化,得到所述量子点层224。
步骤S205.在所述量子点层224上制作电子传输层225。
所述电子传输层225由具有高电子迁移率的电子传输材料制作而成,所述电子传输层225用于将电子粒子传输至所述量子点层224。
步骤S206.在所述电子传输层225上制作电子注入层226。
可选地,所述电子注入层226的材料可以是氧化锂、氧化铯等低功函数材料,所述电子注入层226用于匹配阴极层227与所述电子传输层225之间的势垒,保证电子粒子顺利传输至所述电子传输层225。
步骤S207.在所述电子注入层226上制作阴极227。
可选地,所述阴极227由锂、镁、铝等低功函数金属制作而成,所述阴极227用于产生所述发光层22发光所需的电子粒子。
步骤S3、在所述发光层22上制作盖板23。
可选地,所述盖板23可以是所述显示面板的封装层,包括无机膜层和有机膜层;所述盖板23还可以是所述显示面板的顶层玻璃盖板,用于防止所述显示面板的内部器件遭受磨损。
可选地,所述盖板23覆盖所述显示面板的整个显示面,从而对所述显示面板的整个显示面进行封装或保护。
综上所述,本发明实施例提供的显示面板制作方法,使用喷墨打印技术,将包含阻挡型量子点的量子点墨水打印形成量子点层,利用所述阻挡型量子点对液滴的阻碍作用,将量子点液滴限制在指定区域而不发生扩散,从而避免出现咖啡环效应;通过该方法制作的量子点层具有良好的平整性和均一性,所制作的显示面板表现出较高的显示品质。
本发明实施例还提供了一种显示面板,参考图2所示,所述显示面板包括阵列基板21、设置于所述阵列基板21上的发光层22、以及设置于所述发光层22上的盖板23。
所述发光层22包括量子点层224,所述量子点层224由本发明实施例提供的量子点墨水通过喷墨打印技术制作而成。具体地,所述量子点墨水包括发光型量子点和阻挡型量子点,所述发光型量子点用于在光或电的诱发下发光,所述阻挡型量子点用于在喷墨打印过程中阻挡量子点液滴的扩散,防止出现咖啡环效应,所述量子点层224具有良好的平整性和均一性,所述显示面板可表现出优异的显示质量。
可选地,所述发光层22还包括设置于所述阵列基板21上的阳极层221、设置于所述阳极层221上的空穴注入层222、设置于所述空穴注入层222上的空穴传输层223、设置于所述量子点层224上的电子传输层225、设置于所述电子传输层225上的电子注入层226、以及设置于所述电子注入层226上的阴极227,所述量子点层224设置于所述空穴传输层223和所述电子传输层225之间。应当理解的是,在所述显示面板显示过程中,所述阳极层221发出的空穴粒子和所述阴极227发出的电子粒子经过中间各层的传递汇聚于所述量子点层224,空穴粒子和电子粒子相遇会产生光电效应,并诱发所述量子点层224中的发光型量子点发光。
综上所述,本发明实施例提供的显示面板包括使用本发明实施例提供的量子点墨水制作而成的量子点层,在所述量子点层中的阻挡型量子点的作用下,所述量子点层具有良好的平整性和均一性,所述显示面板表现出优异的显示品质。
需要说明的是,虽然本发明以具体实施例揭露如上,但上述实施例并非用以限制本发明,本领域的普通技术人员,在不脱离本发明的精神和范围内,均可作各种更动与润饰,因此本发明的保护范围以权利要求界定的范围为准。
Claims (10)
1.一种量子点墨水,其特征在于,包括有机溶剂、以及分散于所述有机溶剂中的量子点,所述量子点包括发光型量子点和阻挡型量子点。
2.根据权利要求1所述的量子点墨水,其特征在于,所述发光型量子点为球形量子点。
3.根据权利要求1所述的量子点墨水,其特征在于,所述阻挡型量子点为椭球形量子点或圆柱体形量子点。
4.根据权利要求1所述的量子点墨水,其特征在于,所述发光型量子点在所述量子点墨水中的质量分数为0.1%~10%,所述阻挡型量子点的质量占所述发光型量子点的质量的1%~20%。
5.根据权利要求1所述的量子点墨水,其特征在于,所述有机溶剂为芳香烃类、醚类、醇类中的一种或多种,所述量子点的材料是Ⅱ-Ⅵ型量子点材料、Ⅲ-Ⅴ型量子点材料、Ⅳ-Ⅵ型量子点材料中的一种或多种。
6.根据权利要求1所述的量子点墨水,其特征在于,所述量子点墨水还包括表面张力调节剂和粘度调节剂。
7.一种显示面板制作方法,其特征在于,包括以下步骤:
在一基板上制作阵列层;
在所述阵列层上制作发光层,所述发光层包括量子点层,所述量子点层由权利要求1-6中任一权利要求所述的量子点墨水通过喷墨打印制作而成;
在所述发光层上制作盖板。
8.根据权利要求7所述的显示面板制作方法,其特征在于,所述在所述阵列层上制作发光层的步骤包括:
在所述阵列层上制作阳极层;
在所述阳极层上制作空穴注入层;
在所述空穴注入层上制作空穴传输层;
在所述空穴传输层上制作所述量子点层;
在所述量子点层上制作电子传输层;
在所述电子传输层上制作电子注入层;
在所述电子注入层上制作阴极。
9.根据权利要求7所述的显示面板制作方法,其特征在于,所述量子点层的制作方法包括以下步骤:
配制权利要求1-6中任一权利要求所述的量子点墨水;
使用喷墨打印设备将所述量子点墨水注入所述显示面板的指定区域;
对所述显示面板进行干燥处理,以去除所述量子点墨水中的所述有机溶剂,得到所述量子点层。
10.一种显示面板,其特征在于,包括阵列基板、设置于所述阵列基板上的发光层、以及设置于所述发光层上的盖板;
所述发光层包括量子点层,所述量子点层由权利要求1-5中任一权利要求所述的量子点墨水通过喷墨打印制作而成。
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CN102629667A (zh) * | 2012-04-25 | 2012-08-08 | 上海大学 | 硅基顶发射有机发光微显示器及其制备方法 |
CN109251589A (zh) * | 2017-07-14 | 2019-01-22 | Tcl集团股份有限公司 | 无机纳米材料油墨及其制备方法和应用、qled器件 |
CN109181413A (zh) * | 2018-07-13 | 2019-01-11 | 苏州星烁纳米科技有限公司 | 墨水组合物、纳米颗粒膜及光电子器件 |
CN110484058A (zh) * | 2019-08-20 | 2019-11-22 | 深圳市华星光电半导体显示技术有限公司 | 墨水组合物 |
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CN114420879A (zh) * | 2021-11-30 | 2022-04-29 | 长沙惠科光电有限公司 | 显示面板的制备方法及显示面板 |
CN114420879B (zh) * | 2021-11-30 | 2023-02-07 | 长沙惠科光电有限公司 | 显示面板的制备方法及显示面板 |
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