WO2018232801A1 - 柔性显示装置及其白光有机电致发光器件 - Google Patents

柔性显示装置及其白光有机电致发光器件 Download PDF

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WO2018232801A1
WO2018232801A1 PCT/CN2017/093069 CN2017093069W WO2018232801A1 WO 2018232801 A1 WO2018232801 A1 WO 2018232801A1 CN 2017093069 W CN2017093069 W CN 2017093069W WO 2018232801 A1 WO2018232801 A1 WO 2018232801A1
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layer
light emitting
thickness
organic electroluminescent
electroluminescent device
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PCT/CN2017/093069
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English (en)
French (fr)
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涂爱国
李金川
姜亮
袁伟
刘扬
矫士博
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深圳市华星光电技术有限公司
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Priority to US15/553,544 priority Critical patent/US10424756B2/en
Publication of WO2018232801A1 publication Critical patent/WO2018232801A1/zh

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    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/10OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H10K50/125OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
    • H10K50/13OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light comprising stacked EL layers within one EL unit
    • H10K50/131OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light comprising stacked EL layers within one EL unit with spacer layers between the electroluminescent layers

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  • the present invention relates to the field of optical technologies, and in particular, to a flexible display device and a white organic electroluminescent device thereof.
  • OLED Organic electroluminescent diode
  • the OLED device structure is composed of an anode (ITO), a cathode, and an organic functional layer sandwiched therebetween.
  • the organic functional layer includes a layer structure such as an HIL (hole injection layer), an HTL (hole transport layer), an EML (light emitting layer), or an ETL (electron transport layer).
  • the red light component is insufficient, and when the white light OLED plus color filter is used as a display or a television, the display power consumption is too large due to the low red light efficiency.
  • the invention provides a flexible display device and a white organic electroluminescent device thereof, so as to solve the problem that the power consumption of the display is biased due to low red light efficiency when the white light OLED plus color filter is used as a display or a television in the prior art. Big problem.
  • one technical solution adopted by the present invention is to provide a white organic electroluminescent device, which includes an anode, a first blue light emitting unit, and a second yellow light, which are sequentially stacked. a light emitting unit and a third blue light emitting unit and a cathode, wherein the second yellow light emitting unit includes a red light emitting layer, and the red light emitting layer comprises a material comprising TCTA: 3% Ir(piq) 3, the red light emitting layer has a thickness of 5 nm or less.
  • a white organic electroluminescent device comprising an anode, a first blue light emitting unit, and a second yellow layer which are sequentially stacked. a light emitting unit and a third blue light emitting unit and a cathode, wherein the second yellow light emitting unit includes a red light emitting layer.
  • another technical solution adopted by the present invention is to provide a flexible display device using the above-described white organic electroluminescent device as a light source.
  • the invention has the beneficial effects that the flexible display device and the white organic electroluminescent device provided by the invention are enhanced in the three-layer white organic light-emitting device by adding a red light-emitting layer.
  • the luminous intensity of the red light band optimizes the spectrum of the white OLED device and reduces the power consumption of the display when used as a display device.
  • FIG. 1 is a simplified schematic diagram of a white organic electroluminescent device according to an embodiment of the present invention
  • FIG. 2 is a simplified schematic diagram of a flexible display device according to an embodiment of the present invention.
  • an embodiment of the present invention provides a white organic electroluminescent device, which includes an anode 101, a first blue light emitting unit 100, a second yellow light emitting unit 200, and a first layer.
  • the three blue light emitting unit 300 and the cathode 118 include a red light emitting layer 109 in the second yellow light emitting unit 200.
  • the anode 101 is made of ITO (indium tin oxide) and has a thickness of 70 nm; the cathode 118 is made of Al (aluminum) and has a thickness of 100 nm.
  • the red light emitting layer 109 is made of TCTA: 3% Ir(piq) 3, and the red light emitting layer 109 has a thickness of 5 nm or less, wherein Ir(piq) 3 is mixed in TCTA.
  • TCTA is 4,4',4''-tris(carbazol-9-yl)triphenylamine
  • Ir(piq)3 is Tris(1-phenyl-isoquinoline) Iridium (III); tris[1-phenylisoquinoline-C2,N]indole (III).
  • the first blue light emitting unit 100 includes a first hole injection layer 102, a first hole transport layer 103, a first blue light emitting layer 104, and a first electron transport layer which are sequentially stacked on the anode 101. 105. A first N-type charge generation layer 106.
  • the material of the first hole injection layer 102 is MoO3 (molybdenum trioxide) and has a thickness of 1 nm;
  • the material of the first hole transport layer 103 is ⁇ -NPB (N,N'-diphenyl-N,N'-bis(2-naphthyl)-1,1'-biphenyl-4,4'-di Amine) having a thickness of 160 nm;
  • the material of the first blue light emitting layer 104 is MADN: 3% DSA-ph, and the thickness is 25 nm, wherein the MADN is 2-Methyl-9, 10-bis (naphthalen-2-yl) anthracene; 9,10-bis(2-naphthyl)-2-methylindole; DSA-ph is 1-4-di-[4-(N,N-diphenyl)amino]styryl-benzene);
  • the material of the first electron transport layer 105 is BmPyPb (1,3-bis[3,5-di(pyridin-3-yl)phenyl] Benzene), having a thickness of 10 nm;
  • the material of the first N-type charge generating layer 106 is BmPyPb: 4% Li and has a thickness of 10 nm.
  • the second yellow light emitting unit 200 includes a second P-type charge generating layer 107, a second hole transport layer 108, and a second yellow light which are sequentially stacked on the first N-type charge generating layer 106.
  • the light emitting layer 110, the second electron transport layer 111, the second N type charge generating layer 112, and the red light emitting layer 109 are located on the second hole transport layer 108.
  • the material of the second P-type charge generating layer 107 is HATCN (2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazabenzophenanthrene) , thickness is 10nm;
  • the material of the second hole transport layer 108 is ⁇ -NPB and has a thickness of 30 nm;
  • the material of the second yellow light emitting layer 110 is DCZPPY: Ir(BT)2(acac), thickness 30nm, wherein DCZPPY is 2,6-double ( (9H-carbazol-9-yl)-3,1-phenylene)pyridine; Ir(BT)2(acac) is bis(2-phenylbenzothiazole) acetylacetonate;
  • the material of the second electron transport layer 111 is BmPyPb (1,3-bis[3,5-di(pyridin-3-yl)phenyl] Benzene), having a thickness of 20 nm;
  • the material of the second N-type charge generating layer 112 is BmPyPb: 4% Li and has a thickness of 20 nm.
  • the third blue light emitting unit 300 includes a third P type charge generating layer 113, a third hole transport layer 114, and a third blue light emitting layer which are sequentially stacked on the second N type charge generating layer 112. 115, a third electron transport layer 116, and a third electron injection layer 117.
  • the material of the third P-type charge generating layer 113 is HATCN (2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazabenzophenanthrene) , thickness is 10nm;
  • the material of the third hole transport layer 114 is ⁇ -NPB and has a thickness of 95 nm;
  • the material of the third blue light emitting unit 300 is MADN: 3% DSA-ph, and the thickness is 25 nm;
  • the material of the third electron transport layer 116 is BmPyPb and has a thickness of 20 nm;
  • the material of the third electron injection layer 117 is LiF (lithium fluoride) and has a thickness of 1 nm.
  • an embodiment of the present invention further provides a flexible display device 10 that uses the above-described white organic electroluminescent device as a light source.
  • the flexible display device and the white organic electroluminescent device thereof provided by the present invention enhance the red light in the three-layer white organic light-emitting device due to the addition of the red light-emitting layer 109.
  • the luminous intensity of the band optimizes the spectrum of the white OLED device and reduces the power consumption of the display when used as a display device.

Abstract

一种柔性显示装置及其白光有机电致发光器件,白光有机电致发光器件包括依次层叠设置的阳极(101)、第一蓝光发光单元(100)、第二黄光发光单元(200)以及第三蓝光发光单元(300)以及阴极(118),其中第二黄光发光单元(200)中包括红光发光层(109)。由于加入了红光发光层(109),增强了三叠层白光有机电致发光器件中红光波段的发光强度,优化了白光OLED器件的光谱,用作显示装置时,降低了显示器功耗。

Description

柔性显示装置及其白光有机电致发光器件
【技术领域】
本发明涉及光学技术领域,特别涉及一种柔性显示装置及其白光有机电致发光器件。
【背景技术】
有机电激发光二极管(OLED)由于同时具备自发光,不需背光源、对比度高、厚度薄、视角广、反应速度快、可用于挠曲性面板、使用温度范围广、构造及制程较简单等优异之特性,被认为是下一代的平面显示器新兴应用技术。
OLED器件结构是由阳极(ITO)、阴极以及夹在两者之间的有机功能层构成。其中的有机功能层包括HIL(空穴注入层)、HTL(空穴传输层)、EML(发光层)、ETL(电子传输层)等层构成。
现有的三叠层白光器件OLED器件中红光成分不足,用于白光OLED加彩色滤光片作为显示器或者电视时会因为红光效率较低而导致显示器功耗偏大。
【发明内容】
本发明提供一种柔性显示装置及其白光有机电致发光器件,以解决现有技术中用于白光OLED加彩色滤光片作为显示器或者电视时会因为红光效率较低而导致显示器功耗偏大的问题。
为解决上述技术问题,本发明采用的一个技术方案是:提供一种白光有机电致发光器件,所述白光有机电致发光器件包括依次层叠设置的阳极、第一蓝光发光单元、第二黄光发光单元以及第三蓝光发光单元以及阴极,其中所述第二黄光发光单元中包括红光发光层,所述红光发光层采用的材料包括为TCTA: 3%Ir(piq)3,所述红光发光层的厚度小于等于5纳米。
为解决上述技术问题,本发明采用的另一个技术方案是:提供一种白光有机电致发光器件,所述白光有机电致发光器件包括依次层叠设置的阳极、第一蓝光发光单元、第二黄光发光单元以及第三蓝光发光单元以及阴极,其中所述第二黄光发光单元中包括红光发光层。
为解决上述技术问题,本发明采用的另一个技术方案是:提供一种柔性显示装置,所述柔性显示装置采用上述的白光有机电致发光器件作为发光源。
本发明的有益效果是:区别于现有技术的情况,本发明提供的柔性显示装置及其白光有机电致发光器件中由于加入了红光发光层,增强了三叠白光有机电致发光器件中红光波段的发光强度,优化了白光OLED器件的光谱,用作显示装置时,降低了显示器功耗。
【附图说明】
为了更清楚地说明本发明实施例中的技术方案,下面将对实施例描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,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,其中:
图1是本发明实施例提供的白光有机电致发光器件的简化示意图;
图2是本发明实施例提供的柔性显示装置的简化示意图。
【具体实施方式】
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅是本发明的一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
请参阅图1,本发明实施例提供一种白光有机电致发光器件,该白光有机电致发光器件包括依次层叠设置的阳极101、第一蓝光发光单元100、第二黄光发光单元200以及第三蓝光发光单元300以及阴极118,其中第二黄光发光单元200中包括红光发光层109。其中,阳极101采用的材料为ITO(氧化铟锡),厚度可为70nm;阴极118采用的材料为Al(铝),厚度可为100nm。
在本发明实施例中,红光发光层109采用的材料包括为TCTA:3%Ir(piq)3,红光发光层109的厚度小于等于5纳米,其中,Ir(piq)3参杂在TCTA中,质量分数占3%3,TCTA为4,4',4''-三(咔唑-9-基)三苯胺;Ir(piq)3为Tris(1-phenyl-isoquinoline) iridium(III);三[1-苯基异喹啉-C2,N]铱(III)。
在本发明实施例中,第一蓝光发光单元100包括依次层叠设置在阳极101上的第一空穴注入层102、第一空穴传输层103、第一蓝光发光层104、第一电子传输层105、第一N型电荷产生层106。
其中,第一空穴注入层102的材料为MoO3(三氧化钼),厚度为1nm;
第一空穴传输层103的材料为β-NPB(N,N'-二苯基-N,N'-二(2-萘基)-1,1’-联苯-4,4'-二胺),厚度为160nm;
第一蓝光发光层104的材料为MADN:3%DSA-ph,厚度为25nm,其中,MADN为2-Methyl-9,10-bis(naphthalen-2-yl)anthracene; 9,10-二(2-萘基)-2-甲基蒽;DSA-ph为1-4-di-[4-(N,N-diphenyl)amino]styryl-benzene);
第一电子传输层105的材料为BmPyPb(1,3-bis[3,5-di(pyridin-3-yl)phenyl] benzene),厚度为10nm;
第一N型电荷产生层106的材料为BmPyPb:4%Li,厚度为10nm。
在本发明实施例中,第二黄光发光单元200包括依次层叠设置在第一N型电荷产生层106上的第二P型电荷产生层107、第二空穴传输层108、第二黄光发光层110、第二电子传输层111、第二N型电荷产生层112,红光发光层109位于第二空穴传输层108。
其中,第二P型电荷产生层107的材料为HATCN(2,3,6,7,10,11-六氰基-1,4,5,8,9,12-六氮杂苯并菲),厚度为10nm;
第二空穴传输层108的材料为β-NPB,厚度为30nm;
第二黄光发光层110的材料为DCZPPY: Ir(BT)2(acac),厚度为30nm,其中,DCZPPY为2,6-双( (9H-咔唑-9-基)-3,1-亚苯基)吡啶;Ir(BT)2(acac)为乙酰丙酮酸二(2-苯基苯并噻唑);
第二电子传输层111的材料为BmPyPb(1,3-bis[3,5-di(pyridin-3-yl)phenyl] benzene),厚度为20nm;
第二N型电荷产生层112的材料为BmPyPb: 4%Li,厚度为20nm。
在本发明实施例中,第三蓝光发光单元300包括依次层叠设置在第二N型电荷产生层112上的第三P型电荷产生层113、第三空穴传输层114、第三蓝光发光层115、第三电子传输层116、第三电子注入层117。
其中,第三P型电荷产生层113的材料为HATCN(2,3,6,7,10,11-六氰基-1,4,5,8,9,12-六氮杂苯并菲),厚度为10nm;
第三空穴传输层114的材料为β-NPB,厚度为95nm;
第三蓝光发光单元300的材料为MADN:3%DSA-ph,厚度为25nm;
第三电子传输层116的材料为BmPyPb,厚度为20nm;
第三电子注入层117的材料为LiF(氟化锂),厚度为1nm。
请一并参阅图2,本发明实施例还提供一种柔性显示装置10,该柔性显示装置10采用上述的白光有机电致发光器件作为发光源。
综上所述,本领域技术人员容易理解,本发明提供的柔性显示装置及其白光有机电致发光器件中由于加入了红光发光层109,增强了三叠白光有机电致发光器件中红光波段的发光强度,优化了白光OLED器件的光谱,用作显示装置时,降低了显示器功耗。
以上所述仅为本发明的实施例,并非因此限制本发明的专利范围,凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换,或直接或间接运用在其他相关的技术领域,均同理包括在本发明的专利保护范围内。

Claims (19)

  1. 一种白光有机电致发光器件,其中,所述白光有机电致发光器件包括依次层叠设置的阳极、第一蓝光发光单元、第二黄光发光单元以及第三蓝光发光单元以及阴极,其中所述第二黄光发光单元中包括红光发光层,所述红光发光层采用的材料包括为TCTA: 3%Ir(piq)3,所述红光发光层的厚度小于等于5纳米。
  2. 一种白光有机电致发光器件,其中,所述白光有机电致发光器件包括依次层叠设置的阳极、第一蓝光发光单元、第二黄光发光单元以及第三蓝光发光单元以及阴极,其中所述第二黄光发光单元中包括红光发光层。
  3. 根据权利要求2所述的白光有机电致发光器件,其中,所述红光发光层采用的材料包括为TCTA: 3%Ir(piq)3。
  4. 根据权利要求2所述的白光有机电致发光器件,其中,所述红光发光层的厚度小于等于5纳米。
  5. 根据权利要求2所述的白光有机电致发光器件,其中,所述第一蓝光发光单元包括依次层叠设置在所述阳极上的第一空穴注入层、第一空穴传输层、第一蓝光发光层、第一电子传输层、第一N型电荷产生层。
  6. 根据权利要求5所述的白光有机电致发光器件,其中,所述第二黄光发光单元包括依次层叠设置在所述第一N型电荷产生层上的第二P型电荷产生层、第二空穴传输层、第二黄光发光层、第二电子传输层、第二N型电荷产生层,所述红光发光层位于所述第二空穴传输层。
  7. 根据权利要求6所述的白光有机电致发光器件,其中,所述第三蓝光发光单元包括依次层叠设置在所述第二N型电荷产生层上的第三P型电荷产生层、第三空穴传输层、第三蓝光发光层、第三电子传输层、第三电子注入层。
  8. 根据权利要求5所述的白光有机电致发光器件,其中,
    所述第一空穴注入层的材料为MoO3,厚度为1nm;
    所述第一空穴传输层的材料为β-NPB,厚度为160nm;
    所述第一蓝光发光层的材料为MADN:3%DSA-ph,厚度为25nm;
    所述第一电子传输层的材料为BmPyPb,厚度为10nm;
    所述第一N型电荷产生层的材料为BmPyPb:4%Li,厚度为10nm。
  9. 根据权利要求6所述的白光有机电致发光器件,其中,
    所述第二P型电荷产生层的材料为HATCN,厚度为10nm;
    所述第二空穴传输层的材料为β-NPB,厚度为30nm;
    所述第二黄光发光层的材料为DCZPPY: Ir(BT)2(acac) ,厚度为30nm;
    所述第二电子传输层的材料为BmPyPb,厚度为20nm;
    所述第二N型电荷产生层的材料为BmPyPb: 4%Li,厚度为20nm。
  10. 根据权利要求7所述的白光有机电致发光器件,其中,
    所述第三P型电荷产生层的材料为HATCN,厚度为10nm;
    所述第三空穴传输层的材料为β-NPB,厚度为95nm;
    所述第三蓝光发光单元的材料为MADN:3%DSA-ph,厚度为25nm;
    所述第三电子传输层的材料为BmPyPb,厚度为20nm;
    所述第三电子注入层的材料为LiF,厚度为1nm。
  11. 一种柔性显示装置,其中,所述柔性显示装置采用白光有机电致发光器件作为发光源,所述白光有机电致发光器件包括依次层叠设置的阳极、第一蓝光发光单元、第二黄光发光单元以及第三蓝光发光单元以及阴极,其中所述第二黄光发光单元中包括红光发光层。
  12. 根据权利要求11所述的白光有机电致发光器件,其中,所述红光发光层采用的材料包括为TCTA: 3%Ir(piq)3。
  13. 根据权利要求11所述的白光有机电致发光器件,其中,所述红光发光层的厚度小于等于5纳米。
  14. 根据权利要求11所述的白光有机电致发光器件,其中,所述第一蓝光发光单元包括依次层叠设置在所述阳极上的第一空穴注入层、第一空穴传输层、第一蓝光发光层、第一电子传输层、第一N型电荷产生层。
  15. 根据权利要求14所述的白光有机电致发光器件,其中,所述第二黄光发光单元包括依次层叠设置在所述第一N型电荷产生层上的第二P型电荷产生层、第二空穴传输层、第二黄光发光层、第二电子传输层、第二N型电荷产生层,所述红光发光层位于所述第二空穴传输层。
  16. 根据权利要求15所述的白光有机电致发光器件,其中,所述第三蓝光发光单元包括依次层叠设置在所述第二N型电荷产生层上的第三P型电荷产生层、第三空穴传输层、第三蓝光发光层、第三电子传输层、第三电子注入层。
  17. 根据权利要求14所述的白光有机电致发光器件,其中,
    所述第一空穴注入层的材料为MoO3,厚度为1nm;
    所述第一空穴传输层的材料为β-NPB,厚度为160nm;
    所述第一蓝光发光层的材料为MADN:3%DSA-ph,厚度为25nm;
    所述第一电子传输层的材料为BmPyPb,厚度为10nm;
    所述第一N型电荷产生层的材料为BmPyPb:4%Li,厚度为10nm。
  18. 根据权利要求15所述的白光有机电致发光器件,其中,
    所述第二P型电荷产生层的材料为HATCN,厚度为10nm;
    所述第二空穴传输层的材料为β-NPB,厚度为30nm;
    所述第二黄光发光层的材料为DCZPPY: Ir(BT)2(acac) ,厚度为30nm;
    所述第二电子传输层的材料为BmPyPb,厚度为20nm;
    所述第二N型电荷产生层的材料为BmPyPb: 4%Li,厚度为20nm。
  19. 根据权利要求16所述的白光有机电致发光器件,其中,
    所述第三P型电荷产生层的材料为HATCN,厚度为10nm;
    所述第三空穴传输层的材料为β-NPB,厚度为95nm;
    所述第三蓝光发光单元的材料为MADN:3%DSA-ph,厚度为25nm;
    所述第三电子传输层的材料为BmPyPb,厚度为20nm;
    所述第三电子注入层的材料为LiF,厚度为1nm。
PCT/CN2017/093069 2017-06-22 2017-07-17 柔性显示装置及其白光有机电致发光器件 WO2018232801A1 (zh)

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