CN104051671B - 一种oled显示装置及其制备方法 - Google Patents
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Abstract
本发明涉及显示技术领域,提供一种有机水氧阻隔材料,还提供一种OLED显示装置及其制备方法,所述OLED显示装置在OLED发光层与光取出层之间设有水氧阻隔层,所述水氧阻隔层采用上述有机水氧阻隔材料形成。本发明除全玻璃封装对水汽和氧气良好的阻隔性能阻止水氧进入密闭容腔外,还引入了水氧阻隔层,进一步全面防止了水汽和氧气进入OLED发光层内,延长了OLED发光层的使用寿命;本发明在水氧阻隔层中进一步加入SiO2纳米颗粒,保证了高光出射效率和色彩均匀性。
Description
技术领域
本发明涉及显示技术领域,尤其涉及一种OLED显示装置及其制备方法。
背景技术
有机电致发光显示器件(OrganicElectroluminescenceDisplay,OLED)具有高亮度、宽视角、主动发光、高对比度、超薄便携等优点成为近年来研究和开发的新型平板显示器件。但是,OLED显示器件也存在一些致命的瓶颈,其中之一便是OLED显示器件的寿命问题。导致这一问题的主要原因有:
1)由于OLED显示面板的阴极通常采用的是功函数较低的金属,在有H2O和O2时,与金属反应而导致阴极隆起及器件性能变差;
2)O2本身就是三线态猝灭剂,同时有机发光材料被O2氧化生成羰基化合物(黑斑),从而导致发光量子效率显著降低;
3)对于OLED发光层中其它有机功能材料也可能会被O2氧化,导致OLED显示器件性能恶化。
因此,OLED显示面板的封装技术成为提高OLED显示器件寿命的关键制程,而研究和开发有效的封装技术来阻隔H2O和O2成为亟待解决的任务。
目前封装效果较好的封装方式为玻璃粉(Frit)封装,现有封装结构直接在OLED发光层表面设置光取出层。玻璃对于水蒸气和氧气有很好的隔离效果,但由于玻璃粉对于水蒸气和氧气的阻隔性能远低于玻璃的阻隔性,而且对于玻璃粉封装方式,封装过程中容易产生微裂纹和气泡,从而导致水氧阻隔性的下降。而当水氧进入到OLED发光层内部后,会和OLED发光层内的金属和有机材料发生化学反应,从而导致器件性能变差,并导致黑点的出现。
因此,如何提供一种能够阻止水汽和氧气渗入OLED发光层的显示装置依然是本领域技术人员亟待解决的技术问题。
发明内容
本发明的第一目的在于提供一种有机水氧阻隔材料,基于其组成的特殊性,其可在元件表面形成水氧阻隔层,能够获得理想的阻隔水氧的效果。
为实现上述目的,本发明采用如下技术方案:
一种有机水氧阻隔材料,由包括如下质量百分比的组分制得:聚对二甲苯15-25%、聚氯乙烯15-25%、丙酮5-15%、三氯乙烯5-15%、乙酸戊聚乙烯酯10-20%、聚乙烯醇5-15%、SiO2纳米颗粒0-5%和有机溶剂8-12%。
优选地,所述SiO2纳米颗粒的质量百分比为3-5%,所述有机溶剂为异丙醇或醋酸乙酯。
采用上述配方的原料作为有机水氧阻隔材料,具备极高的水氧阻隔性、原料来源广泛、价格低廉且易于制备的优点。
其中,所述SiO2纳米颗粒的平均粒径小于50nm,优选如30nm。在该范围内,能够确保有机水氧阻隔材料可以均匀成膜。同时,当其应用在部分领域,如OLED显示装置中阻隔水氧进入OLED发光层时,还能提高OLED发光层的光取出效率。
本发明所述的有机水氧阻隔材料可应用于多种需要阻隔水氧的具体情形,包括但并不局限于应用于OLED显示装置中,例如对OLED发光层的保护。
本发明的第二目的即为了增强OLED发光层对水氧阻隔的能力,提出一种结构经改进的OLED显示装置,具体通过在OLED发光层的出光侧增加水氧阻隔层(包括但并不局限于由上述有机水氧阻隔材料形成),从而达到提高OLED发光层寿命的目的。
为实现第二目的,本发明采用如下技术方案:
一种OLED显示装置,其在OLED发光层与光取出层之间设有水氧阻隔层,所述水氧阻隔层采用上述有机水氧阻隔材料形成。
本发明所述的水氧阻隔层还可以采用现有技术公开的多种材料来形成。本领域技术人员可以理解的是,只要具备阻隔水氧性能的层状结构均可以用于实现本发明。
本发明对OLED显示装置的其它结构(如背板等)并无改进,可沿用已有结构。例如,本发明所述OLED显示装置中的背板包括基板、在基板上形成的驱动电路、电路保护层等,所述的基板包括但并不局限于玻璃基板、塑料基板和石英基板等,优选本发明的背板包括底部的玻璃基板,以及在玻璃基板上形成的驱动电路、电路保护层等常规结构。由于仅仅通过玻璃粉封装方式对于水氧的阻隔性有限,本发明提出了在OLED发光层的出光侧增加水氧阻隔层的方案,从而进一步增强器件的水氧阻隔性,达到提高OLED发光层寿命的目的。
本发明所述的OLED显示装置中,光取出层是一层有机或无机材料蒸镀形成的薄膜,厚度为40-70nm,其组成及具体的形成工艺为现有技术,本发明对此不作特别限定。
更具体而言,本发明所述的显示装置还包括设于OLED发光层出光侧的电极,所述水氧阻隔层位于所述电极和所述光取出层之间。
其中,所述水氧阻隔层的厚度为15~20μm。
对于顶发光的OLED显示装置,需要该水氧阻隔层具有很好的光透过率,从而不会导致太多的光损失。另外,由于顶发光OLED发光层的阴极,一般采用具有较高的折射率和消光系数的金属材料,容易在金属阴极的界面处发生全反射,而造成大量的光损失。为了提高发光层的光取出效率,水氧阻隔层需选择高折射率材料,本发明优选在水氧阻隔层中均匀分散SiO2纳米颗粒,从而进一步提高OLED发光层的光取出效率并改善色彩均匀性。由于SiO2纳米颗粒的存在,光在射出时,穿过球形SiO2纳米颗粒时会发生散射,从而提高光取出效率和改善色彩均匀性(SiO2纳米颗粒对光线散射作用示意图参见图1)。
本发明所述的原料中SiO2纳米颗粒的平均粒径小于50nm,优选如30nm。在该范围内,能够确保有机水氧阻隔材料可以均匀成膜和提高光取出效率。
此外,本发明进一步提供了所述OLED显示装置的制备方法,具体包括:
在背板上形成OLED发光层;
在OLED发光层的出光侧形成水氧阻隔层;
在水氧阻隔层的出光侧形成光取出层;
封装。
进一步地,在OLED发光层的出光侧形成水氧阻隔层进一步包括:
将有机水氧阻隔材料涂覆或沉积在OLED发光层表面;
对所述有机水氧阻隔材料进行固化。
本领域技术人员可以理解的是,上述有机水氧阻隔材料在OLED发光层的出光侧形成水氧阻隔层时可以采用包括但不限于涂覆或沉积等方式,只要所采用的方式可以形成具备良好水氧阻隔性能的水氧阻隔层即可。
上述有机水氧阻隔材料形成在OLED发光层出光侧的水氧阻隔膜时可采用均匀涂覆的方式,所述均匀涂覆可采用现有技术公开的多种技术方案,包括但并不局限于旋转涂覆。
进一步地,所述固化可以采用包括但不限于干燥或加热等方式进行固化。
其中,所述光取出层厚度为40-70nm,是一层有机或无机材料蒸镀形成的薄膜,其组成及具体的形成工艺为现有技术,本发明对此不作特别限定。
上述制备方法中,需要注意:
1)水氧阻隔层必须处于金属电极(如阴极)外侧,位于光取出层内侧,若位于光取出层外侧容易发生全反射而降低出光率;
2)要先形成水氧阻隔层,然后再进行玻璃粉封装,须依顺序进行,不能同时进行;
3)在进行玻璃粉封装时,不能让激光照射到水氧阻隔层,避免激光对水氧阻隔层造成破坏;
4)SiO2纳米颗粒的加入量不宜过量,否则影响水氧阻隔层的形成和降低水氧阻隔层的水氧阻隔特性;
5)SiO2纳米颗粒的粒径需小于50nm,粒径太大会对水氧阻隔层的形成和水氧阻隔性能造成影响;
采用上述技术方案,本发明具有如下有益效果:
1)除全玻璃封装对水汽和氧气良好的阻隔性能阻止水氧进入密闭容腔外,本发明还引入了水氧阻隔层,进一步全面防止了水汽和氧气进入OLED发光层内,延长了OLED显示装置的使用寿命。
2)在水氧阻隔层中进一步加入SiO2纳米颗粒,保证了高光出射效率和色彩均匀性。
3)本发明结构简单,生产成本低,且提升水氧阻隔性能的效果显著,具有极高的可推广性。
附图说明
图1为SiO2纳米颗粒对光线散射作用示意图;
图2为本发明OLED显示面板结构示意图;
其中,1为玻璃基板、2为背板、3为玻璃粉、4为阳极ITO、5为OLED发光层、6为金属阴极、7为水氧阻隔层、8为光取出层、9为凹型盖板;
图3为两种OLED显示面板的寿命测试结果示意图。
具体实施方式
本发明实施例的百分比如无特殊说明均为质量百分比。
实施例1
本实施例涉及一种有机水氧阻隔材料,由包括如下质量百分比的组分制得:聚对二甲苯20%、聚氯乙烯20%、丙酮10%、三氯乙烯10%、乙酸戊聚乙烯酯15%、聚乙烯醇10%、SiO2纳米颗粒3%和有机溶剂异丙醇10%。
其中,SiO2纳米颗粒的平均粒径为30nm。
实施例2
本实施例涉及一种有机水氧阻隔材料,由包括如下质量百分比的组分制得:聚对二甲苯15%、聚氯乙烯15%、丙酮5%、三氯乙烯5%、乙酸戊聚乙烯酯10%、聚乙烯醇5%、SiO2纳米颗粒5%和有机溶剂醋酸乙酯8%。
其中,SiO2纳米颗粒的平均粒径为40nm。
实施例3
本实施例涉及一种有机水氧阻隔材料,由包括如下质量百分比的组分制得:聚对二甲苯25%、聚氯乙烯25%、丙酮15%、三氯乙烯15%、乙酸戊聚乙烯酯20%、聚乙烯醇15%、SiO2纳米颗粒3%和有机溶剂醋酸乙酯12%。
其中,SiO2纳米颗粒的平均粒径为50nm。
实施例4
本实施例涉及一种有机水氧阻隔材料,由包括如下质量百分比的组分制得:聚对二甲苯15%、聚氯乙烯25%、丙酮5%、三氯乙烯15%、乙酸戊聚乙烯酯10%、聚乙烯醇15%、SiO2纳米颗粒4%和有机溶剂醋酸乙酯8%。
其中,SiO2纳米颗粒的平均粒径为30nm。
实施例5
本实施例涉及一种有机水氧阻隔材料,由包括如下质量百分比的组分制得:聚对二甲苯25%、聚氯乙烯15%、丙酮15%、三氯乙烯5%、乙酸戊聚乙烯酯20%、聚乙烯醇10%和有机溶剂异丙醇10%。
实施例6
本实施例涉及一种OLED显示装置,具体包括如图2所示的OLED显示面板,该显示面板包括背板2(该背板2包括玻璃基板1,所述玻璃基板也可以为塑料基板或石英基板)、阳极ITO4、OLED发光层5、金属阴极6、水氧阻隔层7、光取出层8及凹型盖板9。其中,阳极ITO4位于OLED发光层5和背板2之间,即OLED发光层5底部(背板顶部),金属阴极6位于OLED发光层5和光取出层8之间。背板2与凹型盖板9通过玻璃粉3熔融封装形成密闭容腔,将OLED发光层5和阳极ITO4、金属阴极6收容于所述密闭容腔内。光取出层8包覆在OLED发光层5表面,在OLED发光层5于光取出层8之间还设有水氧阻隔层7,该水氧阻隔层7位于金属阴极6的外侧。
其中,水氧阻隔层7为一层水氧阻隔膜,其厚度为15μm;由实施例1所述有机水氧阻隔材料在金属阴极上形成。
本实施例中的阴极和阳极仅为示例,不作为对本发明保护范围的具体限制。
实施例7
本实施例提供一种OLED显示装置,其与实施例6相比,区别点仅在于:水氧阻隔层由实施例2所述的有机水氧阻隔材料形成,其厚度为20μm。
实施例8
本实施例提供一种OLED显示装置,其与实施例6相比,区别点仅在于:水氧阻隔层由实施例3所述的有机水氧阻隔材料形成,其厚度为16μm。
实施例9
本实施例提供一种OLED显示装置,其与实施例6相比,区别点仅在于:水氧阻隔层由实施例4所述的有机水氧阻隔材料形成,其厚度为18μm。
实施例10
本实施例提供一种OLED显示装置,其与实施例6相比,区别点仅在于:水氧阻隔层由实施例5所述的有机水氧阻隔材料形成,其厚度为15μm。
实施例11
实施例6所述OLED显示装置的制备方法,具体包括:
(1)在背板上形成待封装的OLED发光层;
(2)将制备有机水氧阻隔材料的原料(除SiO2纳米颗粒)混合均匀并在搅拌机上搅拌40min,加入SiO2纳米颗粒,搅拌混合均匀;
(3)将步骤(2)所得材料,通过旋转涂覆的方法均匀涂覆在OLED发光层的出光侧,形成水氧阻隔膜;其它形成水氧阻隔层的方法例如包括但不限于沉积的方式同样适用于本发明,只要通过该方法可以形成水氧阻隔层即可;
(4)完成步骤(3)后,将其置于80℃真空烘箱中30min,待其烘干后形成水氧阻隔层,其厚度约为15μm;其它固化方式例如包括但不限于其它干燥方式或其它加热等方式同样适用于本发明,只要通过该方式可以形成水氧阻隔层即可;
(5)完成步骤(4)后,制备厚度为50nm的光取出层;
(6)在盖板上涂覆玻璃粉,与背板对盒后进行激光照射,完成封装即得。
实施例12
实施例7所述显示装置的制备方法,具体包括:
(1)在背板上形成待封装的OLED发光层,备用;
(2)将制备有机水氧阻隔材料的原料(除SiO2纳米颗粒)混合均匀并在搅拌机上搅拌30min,加入SiO2纳米颗粒,搅拌混合均匀;
(3)将步骤(2)所得材料,通过旋转涂覆的方法均匀涂覆在OLED发光层的出光侧,形成水氧阻隔膜;
(4)完成步骤(3)后,将其置于90℃真空烘箱中20min,待其烘干后形成水氧阻隔层,其厚度约为20μm;
(5)完成步骤(4)后,制备厚度为70nm的光取出层;
(6)在盖板上涂覆玻璃粉,与背板对盒后进行激光照射,完成封装即得。
实施例13
实施例8所述显示装置的制备方法,具体包括:
(1)在背板上形成待封装的OLED发光层,备用;
(2)将制备有机水氧阻隔材料的原料(除SiO2纳米颗粒)混合均匀并在搅拌机上搅拌60min,加入SiO2纳米颗粒,搅拌混合均匀;
(3)将步骤(2)所得材料,通过旋转涂覆的方法均匀涂覆在OLED发光层的出光侧,形成水氧阻隔膜;
(4)完成步骤(3)后,将其置于70℃真空烘箱中40min,待其烘干后形成水氧阻隔层,其厚度约为16μm;
(5)完成步骤(4)后,制备厚度为60nm的光取出层;
(6)在盖板上涂覆玻璃粉,与背板对盒后进行激光照射,完成封装即得。
实施例14
实施例9所述显示装置的制备方法,具体包括:
(1)在背板上形成待封装的OLED发光层,备用;
(2)将制备有机水氧阻隔材料的原料(除SiO2纳米颗粒)混合均匀并在搅拌机上搅拌50min,加入SiO2纳米颗粒,搅拌混合均匀;
(3)将步骤(2)所得材料,通过旋转涂覆的方法均匀涂覆在OLED发光层的出光侧,形成水氧阻隔膜;
(4)完成步骤(3)后,将其置于70℃真空烘箱中40min,待其烘干后形成水氧阻隔层,其厚度约为18μm;
(5)完成步骤(4)后,制备厚度为40nm的光取出层;
(6)在盖板上涂覆玻璃粉,与背板对盒后进行激光照射,完成封装即得。
实施例15
实施例10所述显示装置的制备方法,具体包括:
(1)在背板上形成待封装的OLED发光层,备用;
(2)将制备有机水氧阻隔材料的原料混合均匀并在搅拌机上搅拌40min,搅拌混合均匀;
(3)将步骤(2)所得材料,通过旋转涂覆的方法均匀涂覆在OLED发光层的出光侧,形成水氧阻隔膜;
(4)完成步骤(3)后,将其置于80℃真空烘箱中30min,待其烘干后形成水氧阻隔层,其厚度约为15μm;
(5)完成步骤(4)后,制备厚度为50nm的光取出层;
(6)在盖板上涂覆玻璃粉,与背板对盒后进行激光照射,完成封装即得。
试验例1
试验对象:
器件Ⅰ
按实施例11所述的方法制备器件Ⅰ;
器件Ⅱ
(1)在背板上形成OLED发光层,备用;
(2)完成步骤(1)后,直接制备厚度为50nm的光取出层;
(3)盖板上涂覆玻璃粉,对盒后进行激光照射,完成封装即得。
试验方法:通过业内已知加速老化测试方法对器件Ⅰ和器件Ⅱ的水透过率和寿命进行测试,对比器件特性差异,结果如下;
试验结果Ⅰ:
器件Ⅰ | 器件Ⅱ | |
水蒸气透过率(WVTR)/(g/m2-day) | <10-6 | 10-3~10-5 |
寿命(亮度百分比,测试13h) | 96% | 88% |
试验结果Ⅱ:
器件Ⅰ | 器件Ⅱ | |
亮度/(cd/m2)(电流10mA) | 6100 | 3400 |
电流效率/(cd/A) | 55.1 | 46.8 |
色彩均匀性/(%) | 91 | 85 |
可视角/(°) | 41 | 35 |
本试验结果表明,本发明仅通过在OLED发光层除紧贴背板的底面外的表面设置水氧阻隔层,即能够解决显示器件中水汽和氧气渗入OLED发光层的问题,设置了水氧阻隔层的OLED显示面板较未设置水氧阻隔层的OLED显示面板取得了显著的延缓器件老化的效果(如图3所示)。
本发明实施例12-15制备的器件也获得了与器件I相似的试验结果。
上述实施例中的实施方案可以进一步组合或者替换,且实施例仅仅是对本发明的优选实施例进行描述,并非对本发明的构思和范围进行限定,在不脱离本发明设计思想的前提下,本领域中专业技术人员对本发明的技术方案作出的各种变化和改进,均属于本发明的保护范围。
Claims (9)
1.一种有机水氧阻隔材料,其特征在于:由包括如下质量百分比的组分制得:聚对二甲苯15-25%、聚氯乙烯15-25%、丙酮5-15%、三氯乙烯5-15%、乙酸戊聚乙烯酯10-20%、聚乙烯醇5-15%、SiO2纳米颗粒0-5%和有机溶剂8-12%。
2.根据权利要求1所述的有机水氧阻隔材料,其特征在于:其中SiO2纳米颗粒的质量百分比为3-5%,有机溶剂为异丙醇或醋酸乙酯。
3.根据权利要求1或2所述的有机水氧阻隔材料,其特征在于:所述SiO2纳米颗粒的平均粒径小于50nm。
4.一种OLED显示装置,其特征在于:在OLED发光层与光取出层之间设有水氧阻隔层,所述水氧阻隔层采用如权利要求1-3任一项所述的有机水氧阻隔材料形成。
5.根据权利要求4所述的OLED显示装置,其特征在于:所述显示装置还包括设于所述OLED发光层出光侧的电极,所述水氧阻隔层位于所述电极和所述光取出层之间。
6.根据权利要求4或5所述的OLED显示装置,其特征在于:所述水氧阻隔层的厚度为15~20μm。
7.一种如权利要求4-6任一项所述OLED显示装置的制备方法,其特征在于:包括:
在背板上形成OLED发光层;
在OLED发光层的出光侧形成水氧阻隔层;
在水氧阻隔层的出光侧形成光取出层;
封装。
8.根据权利要求7所述的制备方法,其特征在于:在OLED发光层的出光侧形成水氧阻隔层进一步包括:
将有机水氧阻隔材料涂覆或沉积在OLED发光层表面;
对所述有机水氧阻隔材料进行固化。
9.根据权利要求8所述的制备方法,其特征在于,所述固化可以采用干燥或加热的方式进行固化。
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US9768412B2 (en) | 2017-09-19 |
WO2015192480A1 (zh) | 2015-12-23 |
EP3155671B1 (en) | 2019-04-17 |
WO2015192723A1 (en) | 2015-12-23 |
EP3155671A1 (en) | 2017-04-19 |
EP3155671A4 (en) | 2018-02-21 |
US20160181569A1 (en) | 2016-06-23 |
CN104051671A (zh) | 2014-09-17 |
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