WO2014172951A1 - 有机电致发光二极管显示装置 - Google Patents

有机电致发光二极管显示装置 Download PDF

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WO2014172951A1
WO2014172951A1 PCT/CN2013/076305 CN2013076305W WO2014172951A1 WO 2014172951 A1 WO2014172951 A1 WO 2014172951A1 CN 2013076305 W CN2013076305 W CN 2013076305W WO 2014172951 A1 WO2014172951 A1 WO 2014172951A1
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light
sub
pixels
display device
emitting
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PCT/CN2013/076305
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French (fr)
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周莉
李玥
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京东方科技集团股份有限公司
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Priority to US14/345,721 priority Critical patent/US20150318506A1/en
Publication of WO2014172951A1 publication Critical patent/WO2014172951A1/zh

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/20Filters
    • G02B5/201Filters in the form of arrays
    • 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
    • H10K50/115OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers comprising active inorganic nanostructures, e.g. luminescent quantum dots
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/20Filters
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30Devices specially adapted for multicolour light emission
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30Devices specially adapted for multicolour light emission
    • H10K59/35Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30Devices specially adapted for multicolour light emission
    • H10K59/38Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00Constructional details relating to the organic devices covered by this subclass
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301Details of OLEDs
    • H10K2102/331Nanoparticles used in non-emissive layers, e.g. in packaging layer

Definitions

  • Embodiments of the present invention relate to an organic electroluminescent diode (OLED) display device.
  • OLED organic electroluminescent diode
  • the existing OLED display device may include a transparent substrate and a plurality of light emitting units disposed on the transparent substrate, and the light emitting unit may include an anode, a hole transport layer, a light emitting module, an electron transport layer, and a cathode; each of the light emitting units is A corresponding TFT (Thin Film Transistor) drives illumination, and each of the illumination units corresponds to one sub-pixel. Since the OLED display device has a small hierarchical structure, it can be made lighter and thinner, and the light-emitting module can significantly save power by self-illumination, so that it gradually develops and matures, and gradually occupies the display market.
  • TFT Thin Film Transistor
  • the RGB three-color OLED manufacturing process is relatively complicated, and it is not easy to achieve high resolution; while the white OLED adopts a structure in which an RGB color film is added on the light-emitting module, it is relatively easy to achieve high resolution, but due to RGB The color film transmittance is low, which will affect the brightness of the display device.
  • the OLED using the RGBW color film increases the brightness of the display device by adding one pixel W, but this will affect the color gamut of the display device.
  • Embodiments of the present invention provide an OLED display device that can achieve high resolution and improve display quality of a display device.
  • An aspect of the invention provides an organic electroluminescent diode display device comprising a light emitting module and a color film layer, the color film layer comprising a plurality of sub-pixels, wherein at least one of the sub-pixels comprises a quantum dot material;
  • the light emitting module includes a plurality of light emitting units corresponding to the plurality of sub-pixels on the color film layer.
  • the sub-pixels have three colors of red, green, and blue;
  • a sub-pixel corresponding to red on the color film layer includes a quantum dot emitting red light
  • a sub-pixel corresponding to green on the color film layer includes a quantum dot emitting green light
  • the color film layer corresponds to a blue color.
  • the sub-pixels include quantum dots that emit blue light; the light-emitting unit in the light-emitting module emits light that excites the red-emitting quantum dots, the green-emitting quantum dots, and the blue-emitting quantum dots.
  • the sub-pixels are corresponding to three colors of red, green, and blue;
  • the light-emitting unit on the light-emitting module is a light-emitting unit that emits blue light;
  • the corresponding red sub-pixel on the color film layer includes a quantum dot that emits red light.
  • the sub-pixel corresponding to the green color on the color film layer includes a quantum dot emitting green light, and the sub-pixel corresponding to the blue color on the color film layer comprises a transparent material.
  • the blue light emitting unit on the light emitting module is an organic electroluminescent diode that emits blue light.
  • the quantum dot includes: a core; a shell formed outside the core; and an organic ligand formed outside the shell.
  • the core of the quantum dot is one of materials ZnS, ZnO, GaN, ZnSe, CdS, ZnTe, GaSe, CdSe, CdTe, GaAs, InP, GaSb, InAs, Te, PbS, InSb, PbTe, and PbSe or A variety of mixed.
  • the shell of the quantum dot is formed of any one of SiO, TiO, ZnO, SiO 2 and MgO.
  • the organic ligand includes S, P, COOH, and NH4 groups.
  • FIG. 1 is a schematic structural diagram of an OLED display device according to an embodiment of the present invention
  • FIG. 2 is a schematic top view of a substrate on which a color film is formed according to an embodiment of the present invention
  • a schematic diagram of a quantum dot structure is shown in FIG. 1 .
  • One embodiment of the present invention provides an OLED display device, as shown in FIG. 1, including a transparent substrate 11, and a color film layer 12 and a light emitting module 13 disposed on the transparent substrate 11.
  • the color film layer 12 includes a plurality of sub-pixels 1211, wherein at least one of the sub-pixels is formed of a quantum dot material.
  • FIG. 2 is a schematic top view of a substrate on which a color film is formed.
  • the color film layer 12 includes a plurality of pixel regions 121, and each of the pixel regions 121 includes three sub-pixels 1211.
  • the sub-pixel regions 1211 of the three sub-pixels respectively correspond to one color, for example, red, green, and blue, respectively; at least one of the sub-pixels is formed of a quantum dot material; and the light generated by the quantum dot material is excited
  • the color has the same color as the sub-pixel region; the other sub-pixel regions may be composed of a filter film of a corresponding color; the filter film described herein is a color filter film applied in the liquid crystal display panel.
  • the light emitting module 13 is disposed above the color film layer 12, and includes a plurality of light emitting units 131 corresponding to the sub-pixel regions 1211 on the color film layer 12, that is, how many colors on the color film layer 12
  • the sub-pixel area 1211 has a plurality of light-emitting units 131 corresponding to the light-emitting module 13 corresponding thereto.
  • the light emitting units 131 each include an anode, a hole transport layer, a light emitting layer, an electron transport layer, and a cathode.
  • Each of the light-emitting units is controlled by a corresponding TFT and can emit light alone.
  • the present invention is not limited to the specific configuration of the light emitting unit.
  • the color film layer 12 is disposed on the substrate 11 and the light emitting module 13 is disposed on the color film layer 12, the positions of the color film layer 12 and the light emitting module 13 are interchangeable, that is, in another In one embodiment, the light emitting module 13 is disposed on the substrate 11 and the color film layer 12 is disposed on the light emitting module 13.
  • the OLED display device of the embodiment of the present invention has different illumination directions in the two modes.
  • each sub-pixel region is controlled by its corresponding light-emitting unit, and each light-emitting unit is correspondingly disposed above one sub-pixel region, and each light-emitting unit is independently controlled by its corresponding TFT.
  • the driving light is emitted, and the luminous intensities may be different from each other. That is, the OLED can be driven in an active manner, but a passive driving method can also be employed.
  • the emitted light can have different colors after passing through the pixel area in the color film, thereby enabling the OLED display
  • the device can display an image.
  • the method of forming a quantum dot into a color film may be as follows. One is to dissolve the quantum dot in an organic solvent, and the quantum dot is sprayed on the substrate to form a color film by spraying (similar to inkjet printing). The other is by imprinting, similar to letterpress printing, engraving quantum dots on patterned silicon wafers, without the need for solvents, and transferring the quantum dots onto the substrate to form a color film.
  • An OLED display device includes a light emitting module and a color film layer. At least one sub-pixel of the color film includes a quantum dot material, and light emitted by the light emitting unit in the light emitting module can form each through the color film layer.
  • the color of the light realizes high resolution, and the color film formed by the quantum dot material also emits light after being excited by the light emitting unit, which can increase the brightness of the display device, and make the image displayed by the display device perform better and live more vividly. , improving the display quality of the display device.
  • each of the pixel regions includes three sub-pixel regions, and the three sub-pixel regions respectively correspond to three colors of red, green, and blue.
  • all the sub-pixels in the color film layer may contain quantum dots.
  • a material that is, a sub-pixel corresponding to red on the color film layer includes a quantum dot emitting red light, and a sub-pixel corresponding to green on the color film layer includes a quantum dot emitting green light, and the color film layer corresponds to a blue color
  • the sub-pixels contain quantum dots that emit blue light.
  • the light emitting unit in the light emitting module may emit light that excites the red light emitting quantum dot, the green light emitting quantum dot, and the blue light emitting quantum dot.
  • the light emitting unit in the light emitting module may be a light emitting unit that emits blue light; the corresponding red subpixel on the color film layer includes a quantum dot emitting red light, and the corresponding green subpixel on the color film layer includes A quantum dot emitting green light, wherein the sub-pixel corresponding to blue on the color film layer comprises a transparent material. Since the light-emitting unit in the light-emitting module is made of the same material that emits blue light, it is convenient to produce a high-resolution display device.
  • the quantum dot may include: a core 31; a shell 32 formed outside the core 31 and an organic ligand 33 formed outside the shell 32.
  • the core 31 of the quantum dot may be one or at least one of materials ZnS, ZnO, GaN, ZnSe, CdS, ZnTe, GaSe, CdSe, CdTe, GaAs, InP, GaSb, InAs, Te, PbS, InSb, PbTe, and PbSe.
  • the quantum The shell 32 of the dots may be formed of any one of SiO, TiO, ZnO, SiO 2 and MgO; the organic ligand 33 of the quantum dots includes S, P, COOH and NH 4 groups.
  • the core-shell structure of the quantum dot shown in Fig. 3 contributes to the quantum dot luminescence, and the organic ligand located outside the shell facilitates the quantum dot: in an organic solvent, facilitating the fabrication of the quantum dot color film.

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  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Nanotechnology (AREA)
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Abstract

一种有机电致发光二极管显示装置,包括发光模块(13)和彩膜层(12),所述彩膜层(12)包括多个子像素(1211),其中,至少一个所述子像素包含量子点材料;所述发光模块(13)包括与所述彩膜层(12)上的多个子像素(1211)对应的多个发光单元(131)。

Description

有机电致发光二极管显示装置 技术领域
本发明的实施例涉及一种有机电致发光二极管 (OLED )显示装置。 背景技术
近来, 由于信息技术的迅速发展, 用于各种电子设备的显示器件变得非 常重要。现有的 OLED显示装置可以包括透明基板和设于透明基板上的多个 发光单元, 所述发光单元可以包括阳极、 空穴传输层、 发光模块、 电子传输 层及阴极; 每个发光单元都由其对应的一个 TFT (薄膜晶体管)驱动发光, 每个发光单元对应一个子像素。 由于 OLED显示装置的层级结构少, 可以制 作得更加轻薄, 且所述发光模块能够自发光显著节省电能, 故逐渐发展和成 熟起来, 逐渐占据显示市场。
在现有的各种 OLED中, RGB三色 OLED制作工艺比较复杂, 且不容 易实现高分辨率; 而白光 OLED采用在发光模块上面加 RGB彩膜的结构比 较容易实现高分辨率, 但由于 RGB彩膜透过率较低, 会影响显示装置的亮 度; 采用 RGBW彩膜的 OLED,通过增加一个像素 W来增加显示装置亮度, 但这样会影响显示装置色域。 发明内容
本发明的实施例提供一种 OLED显示装置, 可以实现高分辨率, 提高显 示装置的显示品质。
本发明的一个方面提供了一种有机电致发光二极管显示装置, 包括发光 模块和彩膜层, 所述彩膜层包括多个子像素, 其中, 至少一个所述子像素包 含量子点材料; 所述发光模块包括与所述彩膜层上的多个子像素对应的多个 发光单元。
例如, 所述子像素对应有红、 绿、 蓝三种颜色;
例如, 所述彩膜层上对应红色的子像素包含发红色光的量子点, 所述彩 膜层上对应绿色的子像素包含发绿色光的量子点, 所述彩膜层上对应蓝色的 子像素包含发蓝色光的量子点; 所述发光模块中的发光单元发射可激发所述 发红光的量子点、 所述发绿光的量子点和所述发蓝光的量子点的光。
例如, 所述子像素对应有红、 绿、 蓝三种颜色; 所述发光模块上的发光 单元为发射蓝光的发光单元; 所述彩膜层上对应红色的子像素包含发红色光 的量子点, 所述彩膜层上对应绿色的子像素包含发绿色光的量子点, 所述彩 膜层上对应蓝色的子像素包含透明材料。
例如, 所述发光模块上的蓝光发光单元为可发蓝色光的有机电致发光二 极管。
例如, 所述量子点包括: 核; 形成在所述核外的壳以及形成于壳外部的 有机配位体。
例如, 所述量子点的核由材料 ZnS、 ZnO、 GaN、 ZnSe、 CdS、 ZnTe、 GaSe、 CdSe、 CdTe、 GaAs、 InP、 GaSb、 InAs、 Te、 PbS、 InSb、 PbTe 和 PbSe中的一种或多种混合而成。
例如, 所述量子点的壳由 SiO、 TiO、 ZnO、 Si02和 MgO中的任意一种 形成。
例如, 所述有机配位体包括 S、 P、 COOH和 NH4基团。 附图说明
为了更清楚地说明本发明实施例的技术方案, 下面将对实施例的附图作 筒单地介绍,显而易见地,下面描述中的附图仅仅涉及本发明的一些实施例, 而非对本发明的限制。
图 1为本发明实施例提供的一种 OLED显示装置的结构示意图; 图 2为本发明实施例提供的一种制作有彩膜的基板的俯视结构示意图; 图 3为本发明实施例提供的一种量子点结构示意图。
附图说明:
11-透明基板; 12-彩膜层, 121-像素区域, 1211-子像素; 13-发光模块, 131-发光单元。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚, 下面将结合本发 明实施例的附图,对本发明实施例的技术方案进行清楚、 完整地描述。显然, 所描述的实施例是本发明的一部分实施例, 而不是全部的实施例。 基于所描 述的本发明的实施例, 本领域普通技术人员在无需创造性劳动的前提下所获 得的所有其他实施例, 都属于本发明保护的范围。
本发明的一个实施例提供了一种 OLED显示装置, 如图 1所示, 包括透 明基板 11 , 以及设置在透明基板 11上的彩膜层 12和发光模块 13。
如图 1所示, 所述彩膜层 12包括多个子像素 1211 , 其中, 至少一个所 述子像素由量子点材料形成。
示例的, 如图 2为制作有彩膜的基板的俯视结构示意图, 所述彩膜层 12 包括多个像素区域 121 , 每个像素区域 121均包括三个子像素 1211。 所述三 个子像素中的子像素区域 1211分别对应一种颜色,例如分别为红、绿和蓝色; 至少一个所述子像素由量子点材料形成; 所述量子点材料被激发后产生的光 具有的颜色与所述子像素区域对应的颜色相同; 其他所述子像素区域可以由 对应颜色的滤光膜组成; 这里所述的滤光膜是液晶显示面板中应用的彩色滤 光膜。
所述发光模块 13, 设置在所述彩膜层 12上方, 包括与所述彩膜层 12上 的子像素区域 1211——对应的多个发光单元 131 , 即所述彩膜层 12上有多 少个子像素区域 1211 , 所述发光模块 13中就有多少个发光单元 131与之对 应。 例如, 所述发光单元 131均包括阳极、 空穴传输层、 发光层、 电子传输 层及阴极。 每个发光单元都由相应的 TFT控制, 可以单独发光。 本发明不限 于发光单元的具体构造。
虽然在图 1中,彩膜层 12设置在基板 11之上而发光模块 13设置在彩膜 层 12之上,但是彩膜层 12和发光模块 13的位置是可以互换的, 即, 在另一 个实施例中发光模块 13设置在基板 11之上而彩膜层 12设置在发光模块 13 之上。 本发明实施例的 OLED显示装置在这两种方式中发光方向不同。
所述 OLED显示装置中没有液晶层,每个子像素区域的发光亮度就由其 对应的发光单元来控制, 每个发光单元对应设置在一个子像素区域上方, 每 个发光单元由其对应的 TFT独立驱动发光, 发光强度可以彼此不同。 即, 该 OLED可以采用有源驱动的方式, 但是也可以采用无源驱动方式。 所发出的 光通过所述彩膜中的像素区域后就可以具有不同的色彩,从而使 OLED显示 装置可以显示图像。
在本发明实施例中,所述彩膜层 12中的至少一个所述子像素区域是由量 子点材料形成, 其他所述子像素区域由对应颜色的滤光膜组成。 所述量子点 材料被激发后产生的光具有的颜色, 与所述子像素区域对应的颜色相同。 例 如, 将量子点制作成彩膜的方法可以有如下两种, 一种是将量子点溶解在有 机溶剂中, 采用喷涂的方式(类似于喷墨打印)将量子点喷在基板上形成彩 膜; 另一种是通过压印的方法, 类似于凸版印刷, 将量子点印刻在有图案的 硅片上, 不需要溶剂, 再将量子点转印在基板上形成彩膜。
本发明实施例提供的 OLED显示装置, 包括发光模块和彩膜层, 所述彩 膜中的至少一个子像素包含量子点材料, 发光模块中的发光单元发出的光通 过彩膜层后可以形成各种颜色的光, 实现高分辨率, 且由量子点材料形成的 彩膜通过发光单元的激发后也会发光, 可以增加显示装置的亮度, 使显示装 置显示的图像色彩表现更好, 更加鲜活, 提高了显示装置的显示品质。
在本发明的另一个实施例中, 每个像素区域包括三个子像素区域, 所述 三个子像素区域分别对应红、 绿、 蓝三种颜色。 由于所述量子点材料的发光 光语较锐, 色度纯正, 因此为了使 OLED显示装置具有高分辨率且显示的图 像更好, 可以使所述彩膜层中所有的子像素都包含量子点材料, 即所述彩膜 层上对应红色的子像素包含发红色光的量子点, 所述彩膜层上对应绿色的子 像素包含发绿色光的量子点, 所述彩膜层上对应蓝色的子像素包含发蓝色光 的量子点。所述发光模块中的发光单元可以发射出激发所述发红光的量子点、 所述发绿光的量子点和所述发蓝光的量子点的光。
优选的, 所述发光模块中的发光单元可以为发射蓝光的发光单元; 所述 彩膜层上对应红色的子像素包含发红色光的量子点 , 所述彩膜层上对应绿色 的子像素包含发绿色光的量子点, 所述彩膜层上对应蓝色的子像素包含透明 材料。 由于所述发光模块中的发光单元由同一种发射蓝光的材料制成, 所以 方便制作高分辨率的显示器件。
如图 3所示, 所述量子点可以包括: 核 31; 形成在所述核 31外的壳 32 以及形成于壳 32外部的有机配位体 33。所述量子点的核 31可以由材料 ZnS、 ZnO、 GaN、 ZnSe、 CdS、 ZnTe、 GaSe、 CdSe、 CdTe、 GaAs、 InP、 GaSb、 InAs、 Te、 PbS、 InSb、 PbTe和 PbSe中一种或至少两种混合形成; 所述量子 点的壳 32可以由 SiO、 TiO、 ZnO、 Si02和 MgO中的任意一种形成; 所述 量子点的有机配位体 33包括 S、 P、 COOH和 NH4基团。 图 3所示的量子 点的核壳结构有助于量子点发光, 位于壳外部的有机配位体有利于将量子点 ^:在有机溶剂中, 有利于量子点彩膜的制作。
以上所述仅是本发明的示范性实施方式, 而非用于限制本发明的保护范 围, 本发明的保护范围由所附的权利要求确定。

Claims

权利要求书
1、 一种有机电致发光二极管显示装置, 包括发光模块和彩膜层, 其中, 所述彩膜层包括多个子像素, 至少一个所述子像素包含量子点材料; 所述发光模块包括与所述彩膜层上的多个子像素对应的多个发光单元。
2、 根据权利要求 1所述的显示装置, 其中, 所述子像素对应有红、 绿、 蓝三种颜色;
所述彩膜层上对应红色的子像素包含发红色光的量子点, 所述彩膜层上 对应绿色的子像素包含发绿色光的量子点 , 所述彩膜层上对应蓝色的子像素 包含发蓝色光的量子点;
所述发光模块中的发光单元发射出激发所述发红光的量子点、 所述发绿 光的量子点和所述发蓝光的量子点的光。
3、 根据权利要求 1所述的显示装置, 其中, 所述子像素对应有红、 绿、 蓝三种颜色;
所述发光模块中的发光单元为发射蓝光的发光单元;
所述彩膜层上对应红色的子像素包含发红色光的量子点, 所述彩膜层上 对应绿色的子像素包含发绿色光的量子点 , 所述彩膜层上对应蓝色的子像素 包含透明材料。
4、根据权利要求 3所述的显示装置, 其中, 所述发光模块上发蓝光的发 光单元包括发蓝色光的有机电致发光二极管。
5、根据权利要求 1-4任一所述的显示装置,其中,所述量子点包括: 核; 形成在所述核外的壳以及形成于壳外部的有机配位体。
6、根据权利要求 5所述的显示装置,其中,所述量子点的核由材料 ZnS、 ZnO、 GaN、 ZnSe、 CdS、 ZnTe、 GaSe、 CdSe、 CdTe、 GaAs、 InP、 GaSb、 InAs、 Te、 PbS、 InSb、 PbTe和 PbSe中的一种或多种混合形成;
所述量子点的壳由 SiO、 TiO、 ZnO、 Si02和 MgO中的任意一种形成; 所述有机配位体包括 S、 P、 COOH和 NH4基团。
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