CN104576702B - Oled彩色显示器件 - Google Patents
Oled彩色显示器件 Download PDFInfo
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Abstract
本发明提供一种OLED彩色显示器件,包括基板(1)、阳极(11)、薄膜晶体管阵列(21)、空穴注入层(22)、空穴传输层(23)、发光层(3)、电子传输层(24)、阴极(12)、封装盖板(2)、色彩转换层(4)、及密封胶框(5);所述发光层(3)包括第一发光层(31)、及第二发光层(32),所述第一发光层(31)、及第二发光层(32)均由主体材料掺杂客体材料制成,所述客体材料包括发光材料、与电子传输材料;所述第一发光层(31)为蓝光发光层,所述第二发光层(32)为红绿光共同发光层、黄光发光层、或绿光发光层;所述第一发光层(31)与所述第二发光层(32)发射的光共同合成白光或青色光,具有较高的能量效率与发光效率,能耗低。
Description
技术领域
本发明涉及显示技术领域,尤其涉及一种OLED彩色显示器件。
背景技术
有机发光二极管显示器件(Organic Light Emitting Diode,OLED)是一种极具发展前景的平板显示技术,它不仅具有十分优异的显示性能,还具有自发光、结构简单、超轻薄、响应速度快、宽视角、低功耗及可实现柔性显示等特性,被誉为“梦幻显示器”,再加上其生产设备投资远小于液晶显示器(LiquidCrystal Display,LCD),得到了各大显示器厂家的青睐,已成为显示技术领域中第三代显示器件的主力军。
OLED一般包括:基板、置于基板上的阳极(Anode)、置于阳极上的空穴注入层(HoleInjection Layer,HIL)、置于空穴注入层上的空穴传输层(HoleTransport Layer,HTL)、置于空穴传输层上的发光层(Emitter)、置于发光层上的电子传输层(Electron TransportLayer,ETL)、置于电子传输层上的电子注入层(Electron Injection Layer,EIL)以及置于电子注入层上的阴极(Cathode)。为了提高效率,发光层通常采用主/客体掺杂系统。目前,实现OLED的彩色化有几种技术路线:一种是红绿蓝(Red、Green、Blue,RGB)三基色发光,以三星公司为代表。该技术只适用于容易升华的有机小分子材料,其优点是工艺简单成熟,操作简便.但由于在制备高分辨率显示屏时需要高精度掩膜及精确的对位,导致产能较低、成本较高,而且由于三基色的寿命、激发率以及衰减度相差较大,容易造成OLED彩色显示器件的偏色。
另一种是白光+RGB滤光片(Color Filter,CF)技术,以LG公司为代表。由于可利用LCD成熟的CF技术,不需要掩膜对位,极大地简化了蒸镀过程,因而能降低生产成本,可用于制备大尺寸高分辨率OLED。
然而,在现有的白光+RGB滤光片的技术中,发光层均没有掺入电子传输材料以使发光位置远离发光层与电子传输层的界面,导致能量效率较低,能耗较高。
因此,有必要研发一种能量效率高、低能耗的OLED彩色显示器件。
发明内容
本发明的目的在于提供一种OLED彩色显示器件,具有较高的能量效率与发光效率,能耗低。
为实现上述目的,本发明提供一种OLED彩色显示器件,包括基板、形成于所述基板上的阳极、形成于所述阳极上的薄膜晶体管阵列、形成于所述薄膜晶体管阵列上的空穴注入层、形成于所述空穴注入层上的空穴传输层、形成于所述空穴传输层上的发光层、形成于所述发光层上的电子传输层、形成于所述电子传输层上的阴极、设于所述阴极上方并与所述基板相贴合的封装盖板、形成于所述封装盖板内侧的色彩转换层、及粘结所述基板与封装盖板的密封胶框;
所述发光层包括第一发光层、及第二发光层,所述第一发光层、及第二发光层均由主体材料掺杂客体材料制成,所述客体材料包括发光材料、与电子传输材料;所述第一发光层为蓝光发光层,所述第二发光层为红绿光共同发光层、黄光发光层、或绿光发光层;所述第一发光层与所述第二发光层发射的光共同合成白光或青色光;
所述色彩转换层包括间隔设置的蓝色滤光单元、绿色滤光单元、及红色转换单元;所述白光或青色光经由所述蓝色滤光单元过滤成为蓝光,经由所述绿色滤光单元过滤成为绿光,经由所述红色转换单元转换成为红光,从而实现彩色显示。
所述主体材料与客体材料的比例为8:1~20:1,所述客体材料中的发光材料与电子传输材料的比例为1:1~10:1。
所述色彩转换层还包括一空白透光单元,所述白光或青色光透过所述空白透光单元后仍为白光或青色光。
在所述第一发光层中,所述主体材料为有机蓝光主体材料,所述客体材料中的发光材料、及电子传输材料分别为蓝色荧光掺杂剂、及电子传输掺杂剂;在所述第二发光层中,所述主体材料为有机蓝光主体材料或有机绿光主体材料,所述客体材料中的发光材料、及电子传输材料分别为磷光掺杂剂、及电子传输掺杂剂。
所述磷光掺杂剂为红、绿色磷光共掺杂剂或黄色磷光掺杂剂,使得所述第一发光层发射的蓝色荧光与第二发光层发射的红绿色磷光、或黄色磷光合成白光;或所述磷光掺杂剂为绿色磷光掺杂剂,使得所述第一发光层发射的蓝色荧光与第二发光层发射的绿色磷光合成青色光。
所述发光层还包括一设于所述第一发光层、及第二发光层之间的间隔层,所述间隔层由主体材料掺杂电子传输材料组成,所述主体材料为有机蓝光主体材料或有机绿光主体材料。
所述基板与封装盖板的材料为玻璃或柔性材料,所述基板与封装盖板中至少有一个透光。
所述有机蓝光主体材料为4,4',4″-三(咔唑-9-基)三苯胺、或2,4,6,-三(9H-咔唑-9-基)-1,3,5-三嗪;所述有机绿光主体材料为3,3’-(1,3-苯基)双(7-乙氧基-4-甲基香豆素);所述蓝色荧光掺杂剂为聚芴类、4,4’-双(2,2-二苯乙烯基)联苯、或FIr6;所述红、绿色磷光共掺杂剂包括红色磷光掺杂剂与绿色磷光掺杂剂;所述红色磷光掺杂剂为三(1-苯基-异喹啉)合铱(III);所述绿色磷光掺杂剂为三(2-苯基吡啶)合铱;所述黄色磷光掺杂剂为二(2,3-二苯基吡嗪)-乙酰丙酮合铱;所述电子传输掺杂剂为2-(4'-叔丁基苯)-5-(4″-联苯基)-1,3,4-噁二唑。
所述发光层采用真空热蒸镀或溶液成膜的方式形成。
所述电子传输层的材料为八羟基喹啉铝,所述空穴传输层的材料为聚三苯胺。
本发明的有益效果:本发明提供的一种的OLED彩色显示器件,其发光层包括第一发光层与第二发光层,将能量带隙大的蓝光发光材料与红绿光发光材料、黄光发光材料、或绿光发光材料分别设于第一、第二发光层中实现分层发光,再合成白光或青色光,具有较高的能量效率,并且分别在第一、第二发光层中掺入电子传输材料,帮助电子传输,同时使发光位置远离发光层与电子传输层的界面,避免激子的淬灭,有效提高了OLED彩色显示器件的发光效率,降低能耗。
为了能更进一步了解本发明的特征以及技术内容,请参阅以下有关本发明的详细说明与附图,然而附图仅提供参考与说明用,并非用来对本发明加以限制。
附图说明
下面结合附图,通过对本发明的具体实施方式详细描述,将使本发明的技术方案及其他有益效果显而易见。
附图中,
图1为本发明OLED彩色显示器件第一实施例的结构示意图;
图2为本发明OLED彩色显示器件中发光层的第一种结构示意图;
图3为本发明OLED彩色显示器件中发光层的第二种结构的示意图;
图4为图1中一个像素的驱动电路示意图;
图5为本发明OLED彩色显示器件第一实施例的像素排布示意图;
图6为本发明OLED彩色显示器件第二实施例的结构示意图;
图7为图6中一个像素的驱动电路示意图;
图8为本发明OLED彩色显示器件第二实施例的一种像素排布示意图;
图9为本发明彩色显示器件第二实施例的另一种像素排布示意图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果,以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图1,为本发明一种OLED彩色显示器件的第一实施例的结构示意图,包括基板1、形成于所述基板1上的阳极11、形成于所述阳极11上的薄膜晶体管阵列(Thin FilmTransistor,TFT)21、形成于所述薄膜晶体管阵列21上的空穴注入层22、形成于所述空穴注入层22上的空穴传输层23、形成于所述空穴传输层23上的发光层3、形成于所述发光层3上的电子传输层24、形成于所述电子传输层24上的阴极12、设于所述阴极12上方并与所述基板1相贴合的封装盖板2、形成于所述封装盖板2内侧的色彩转换层4、及粘结所述基板1与封装盖板2的密封胶框5。
请参阅图2,所述发光层3包括第一发光层31、及第二发光层32。所述第一发光层31为蓝光发光层,所述第二发光层32为红绿光共同发光层、黄光发光层、或绿光发光层。所述第一发光层31与所述第二发光层32发射的光共同合成白光或青色光。
所述色彩转换层4包括间隔设置的蓝色滤光单元41、绿色滤光单元42、及红色转换单元43。所述蓝色滤光单元41、及绿色滤光单元42采用彩色滤光片(Color Filter,CF)原理进行滤光,得到蓝光、及绿光。所述红色转换单元43采用色转换材料(Color ChangeMaterial,CCM)进行光的色彩转换。所述白光或青色光经由所述蓝色滤光单元41过滤成为蓝光,经由所述绿色滤光单元42过滤成为绿光,经由所述红色转换单元43转换成为红光,从而实现彩色显示。
具体地,所述基板1与封装盖板2的材料可以是玻璃,也可以是柔性材料,其中至少一个要透光,优选的,所述基板1与封装盖板2均为玻璃板。所述密封胶框5能够防止外界的水汽、氧气进入,保护内部元件。
所述空穴传输层23的材料为聚三苯胺(poly-TPD),所述电子传输层24的材料为八羟基喹啉铝(Alq3)。
所述第一发光层31、及所述第二发光层32均由主体材料掺杂客体材料制成,所述客体材料包括发光材料、及电子传输材料,所述电子传输材料可以起到增大电子传输速率的作用。
优选的,所述主体材料与客体材料的比例为8:1~20:1,所述客体材料中的发光材料与电子传输材料的比例为1:1~10:1。
在所述第一发光层31中,所述主体材料为有机蓝光主体材料,所述客体材料中的发光材料、及电子传输材料分别为蓝色荧光掺杂剂、及电子传输掺杂剂。在所述第二发光层32中,所述主体材料为有机蓝光主体材料或有机绿光主体材料,所述客体材料中的发光材料、及电子传输材料分别为磷光掺杂剂、及电子传输掺杂剂。
所述磷光掺杂剂可以是红、绿色磷光共掺杂剂或黄色磷光掺杂剂,使得所述第一发光层31发射的蓝色荧光与第二发光层32发射的红绿色磷光、或黄色磷光合成白光。所述磷光掺杂剂也可以是绿色磷光掺杂剂,使得所述第一发光层31发射的蓝色荧光与第二发光层32发射的绿色磷光合成青色光。
所述发光层3也可以如图3所示,除包括所述第一发光层31、及第二发光层32外,还包括一设于所述第一发光层31、及第二发光层32之间的间隔层33。所述间隔层33由主体材料掺杂电子传输材料组成,所述主体材料可以是有机蓝光主体材料或有机绿光主体材料。所述间隔层33的作用是使所述第一发光层31与第二发光层32分开,使得具有蓝色荧光掺杂剂的第一发光层31中的激子与具有磷光掺杂剂的第二发光层32中的激子不会互相影响。
进一步地,所述有机蓝光主体材料可以是4,4',4″-三(咔唑-9-基)三苯胺(TCTA),其分子式为:
或2,4,6,-三(9H-咔唑-9-基)-1,3,5-三嗪(TRZ),其分子式为:
所述有机绿光主体材料可以是3,3’-(1,3-苯基)双(7-乙氧基-4-甲基香豆素)(mEMCB)其分子式为:
所述蓝色荧光掺杂剂可以是聚芴类、4,4’-双(2,2-二苯乙烯基)联苯(DPVBi)、或FIr6。
所述红、绿色磷光共掺杂剂包括红色磷光掺杂剂与绿色磷光掺杂剂。所述红色磷光掺杂剂可以是三(1-苯基-异喹啉)合铱(III)(Ir(piq)3),其分子式为:
所述绿色磷光掺杂剂可以是三(2-苯基吡啶)合铱(Ir(ppy)3),其分子式为:
所述黄色磷光掺杂剂可以是二(2,3-二苯基吡嗪)-乙酰丙酮合铱(Ir(dphp)2(acac)),其分子式为:
所述电子传输掺杂剂可以是2-(4'-叔丁基苯)-5-(4″-联苯基)-1,3,4-噁二唑(PBD),其分子式为:
所述发光层3可以采用真空热蒸镀或溶液成膜的方式形成。
将发光层3设置为第一发光层31与第二发光层32,将能量带隙大的蓝光发光材料与红绿光发光材料、黄光发光材料、或绿光发光材料分别设于第一、第二发光层31、32中能够实现分层发光,再合成白光或青色光,具有较高的能量效率,并且分别在第一、第二发光层31、32中掺入了电子传输材料,能够帮助电子传输,同时使发光位置远离发光层3与电子传输层24的界面,避免激子的淬灭,有效提高OLED彩色显示器件的发光效率,降低能耗。
请参阅图4,在该第一实施例中,所述蓝色滤光单元41、绿色滤光单元42、及红色转换单元43对应一像素,所述像素包括红色子像素83、绿色子像素82、及蓝色子像素81。所述红色转换单元43对应像素中的红色子像素83,所述绿色滤光单元42对应像素中的绿色子像素82、所述蓝色滤光单元41对应像素中的蓝色子像素81。所述红色子像素83、绿色子像素82、及蓝色子像素81分别对应一个TFT,以控制每个子像素分别对应的发光层3的区域是否发光。
当TFT控制对应于蓝色子像素81的发光层3的区域发光时,该发光层3发出的白光或青色光经由蓝色滤光单元41过滤成为蓝光;当TFT控制对应于绿色子像素82的发光层3的区域发光时,该发光层3区域发出的白光或青色光经由绿色滤光单元42过滤成为绿光;当TFT控制对应于红色子像素83的发光层3的区域发光时,该发光层3区域发出的白光或青色光经由红色转换单元43转换成为红光,从而实现了红、绿、蓝三基色的显示,并能叠加出各种色彩,实现彩色显示。
请参阅图5,为本发明OLED彩色显示器件第一实施例的像素排布示意图,每相邻上下两行的像素排布方式完全相同,所述红色子像素83、绿色子像素82、与蓝色子像素81沿水平方向从左至右依次间隔设置。
请参阅图6,为本发明OLED彩色显示器件第二实施例的结构示意图。该第二实施例与上述第一实施例的区别在于,所述色彩转换层4还包括一空白透光单元40,所述白光或青色光透过所述空白透光单元40后仍为白光或青色光,可以增大OLED彩色显示器件的亮度。
请参阅图7,在该第二实施例中,所述蓝色滤光单元41、绿色滤光单元42、红色转换单元43、及空白透光单元40对应一像素,所述像素包括红色子像素83、绿色子像素82、蓝色子像素81、及白色或青色子像素80。所述红色转换单元43对应像素中的红色子像素83,所述绿色滤光单元42对应像素中的绿色子像素82、所述蓝色滤光单元41对应像素中的蓝色子像素81,所述空白透光单元40对应像素中的白色或青色子像素80。所述红色子像素83、绿色子像素82、蓝色子像素81、及白色或青色子像素80分别对应一个TFT,以控制每个子像素分别对应的发光层3的区域是否发光。
请参阅图8,为本发明OLED彩色显示器件第二实施例的一种像素排布示意图,每相邻上下两行的像素排布方式完全相同,所述红色子像素83、绿色子像素82、蓝色子像素81、及白色或青色子像素80沿水平方向从左至右依次间隔设置。
请参阅图9,为该第二实施例的另一种像素排布示意图,所述红色子像素83、绿色子像素82、蓝色子像素81、及白色或青色子像素80沿顺时针方向依次间隔设置。由此说明,本发明的技术效果与像素的各子像素的排布方式无关,可应用于不同像素排布方式的OLED彩色显示器件。
综上所述,本发明的OLED彩色显示器件,其发光层包括第一发光层与第二发光层,将能量带隙大的蓝光发光材料与红绿光发光材料、黄光发光材料、或绿光发光材料分别设于第一、第二发光层中实现分层发光,再合成白光或青色光,具有较高的能量效率,并且分别在第一、第二发光层中掺入电子传输材料,帮助电子传输,同时使发光位置远离发光层与电子传输层的界面,避免激子的淬灭,有效提高了OLED彩色显示器件的发光效率,降低能耗。
以上所述,对于本领域的普通技术人员来说,可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形,而所有这些改变和变形都应属于本发明后附的权利要求的保护范围。
Claims (10)
1.一种OLED彩色显示器件,其特征在于,包括基板(1)、形成于所述基板(1)上的阳极(11)、形成于所述阳极(11)上的薄膜晶体管阵列(21)、形成于所述薄膜晶体管阵列(21)上的空穴注入层(22)、形成于所述空穴注入层(22)上的空穴传输层(23)、形成于所述空穴传输层(23)上的发光层(3)、形成于所述发光层(3)上的电子传输层(24)、形成于所述电子传输层(24)上的阴极(12)、设于所述阴极(12)上方并与所述基板(1)相贴合的封装盖板(2)、形成于所述封装盖板(2)内侧的色彩转换层(4)、及粘结所述基板(1)与封装盖板(2)的密封胶框(5);
所述发光层(3)包括第一发光层(31)、及第二发光层(32),所述第一发光层(31)、及第二发光层(32)均由主体材料掺杂客体材料制成,所述客体材料包括发光材料、与电子传输材料;所述第一发光层(31)为蓝光发光层,所述第二发光层(32)为红绿光共同发光层、黄光发光层、或绿光发光层;所述第一发光层(31)与所述第二发光层(32)发射的光共同合成白光或青色光;
所述色彩转换层(4)包括间隔设置的蓝色滤光单元(41)、绿色滤光单元(42)、及红色转换单元(43);所述白光或青色光经由所述蓝色滤光单元(41)过滤成为蓝光,经由所述绿色滤光单元(42)过滤成为绿光,经由所述红色转换单元(43)转换成为红光,从而实现彩色显示。
2.如权利要求1所述的OLED彩色显示器件,其特征在于,所述主体材料与客体材料的比例为8:1~20:1,所述客体材料中的发光材料与电子传输材料的比例为1:1~10:1。
3.如权利要求1所述的OLED彩色显示器件,其特征在于,所述色彩转换层(4)还包括一空白透光单元(40),所述白光或青色光透过所述空白透光单元(40)后仍为白光或青色光。
4.如权利要求2所述的OLED彩色显示器件,其特征在于,在所述第一发光层(31)中,所述主体材料为有机蓝光主体材料,所述客体材料中的发光材料、及电子传输材料分别为蓝色荧光掺杂剂、及电子传输掺杂剂;在所述第二发光层(32)中,所述主体材料为有机蓝光主体材料或有机绿光主体材料,所述客体材料中的发光材料、及电子传输材料分别为磷光掺杂剂、及电子传输掺杂剂。
5.如权利要求4所述的OLED彩色显示器件,其特征在于,所述磷光掺杂剂为红、绿色磷光共掺杂剂或黄色磷光掺杂剂,使得所述第一发光层(31)发射的蓝色荧光与第二发光层(32)发射的红绿色磷光、或黄色磷光合成白光;或所述磷光掺杂剂为绿色磷光掺杂剂,使得所述第一发光层(31)发射的蓝色荧光与第二发光层(32)发射的绿色磷光合成青色光。
6.如权利要求1所述的OLED彩色显示器件,其特征在于,所述发光层(3)还包括一设于所述第一发光层(31)与第二发光层(32)之间的间隔层(33),所述间隔层(33)由主体材料掺杂电子传输材料组成,所述主体材料为有机蓝光主体材料或有机绿光主体材料。
7.如权利要求1所述的OLED彩色显示器件,其特征在于,所述基板(1)与封装盖板(2)的材料为玻璃或柔性材料,所述基板(1)与封装盖板(2)中至少有一个透光。
8.如权利要求5所述的OLED彩色显示器件,其特征在于,所述有机蓝光主体材料为4,4',4″-三(咔唑-9-基)三苯胺、或2,4,6,-三(9H-咔唑-9-基)-1,3,5-三嗪;所述有机绿光主体材料为3,3’-(1,3-苯基)双(7-乙氧基-4-甲基香豆素);所述蓝色荧光掺杂剂为聚芴类、4,4’-双(2,2-二苯乙烯基)联苯、或FIr6;所述红、绿色磷光共掺杂剂包括红色磷光掺杂剂与绿色磷光掺杂剂;所述红色磷光掺杂剂为三(1-苯基-异喹啉)合铱(III);所述绿色磷光掺杂剂为三(2-苯基吡啶)合铱;所述黄色磷光掺杂剂为二(2,3-二苯基吡嗪)-乙酰丙酮合铱;所述电子传输掺杂剂为2-(4'-叔丁基苯)-5-(4″-联苯基)-1,3,4-噁二唑。
9.如权利要求1所述的OLED彩色显示器件,其特征在于,所述发光层(3)采用真空热蒸镀或溶液成膜的方式形成。
10.如权利要求1所述的OLED彩色显示器件,其特征在于,所述电子传输层(24)的材料为八羟基喹啉铝,所述空穴传输层(23)的材料为聚三苯胺。
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