CN117641965A - Organic electroluminescent device, preparation method and display device - Google Patents
Organic electroluminescent device, preparation method and display device Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000010410 layer Substances 0.000 claims abstract description 289
- 229910052751 metal Inorganic materials 0.000 claims abstract description 157
- 239000002184 metal Substances 0.000 claims abstract description 157
- 238000000605 extraction Methods 0.000 claims abstract description 85
- 238000000034 method Methods 0.000 claims abstract description 65
- 239000012044 organic layer Substances 0.000 claims abstract description 41
- 238000007639 printing Methods 0.000 claims abstract description 25
- 239000000758 substrate Substances 0.000 claims abstract description 23
- 238000001704 evaporation Methods 0.000 claims abstract description 15
- 230000008020 evaporation Effects 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims description 35
- 229910052709 silver Inorganic materials 0.000 claims description 22
- 239000004332 silver Substances 0.000 claims description 22
- 239000011777 magnesium Substances 0.000 claims description 17
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 16
- 229910052749 magnesium Inorganic materials 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000005538 encapsulation Methods 0.000 claims description 3
- 238000004544 sputter deposition Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- YVTHLONGBIQYBO-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O--].[Zn++].[In+3] YVTHLONGBIQYBO-UHFFFAOYSA-N 0.000 description 3
- 229910001111 Fine metal Inorganic materials 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
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- 230000003993 interaction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- SKEDXQSRJSUMRP-UHFFFAOYSA-N lithium;quinolin-8-ol Chemical compound [Li].C1=CN=C2C(O)=CC=CC2=C1 SKEDXQSRJSUMRP-UHFFFAOYSA-N 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
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Abstract
The embodiment of the application provides an organic electroluminescent device, a preparation method and a display device, wherein the organic electroluminescent device comprises a first electrode, an organic layer group, a second electrode, a light extraction layer and a metal reflecting layer which are sequentially stacked; the organic layer group is prepared by an evaporation process, and the light extraction layer is prepared by a printing process; the first electrode comprises a plurality of sub-electrodes corresponding to the sub-pixels respectively, the thicknesses of the sub-electrodes are the same, and a microcavity structure is formed on one side of the metal reflecting layer facing the substrate. According to the technology, the organic electroluminescent device can be prepared and finished without adopting FFM, the luminous efficiency of RGB light of the organic electroluminescent device is remarkably improved, and the power consumption is reduced.
Description
Technical Field
The application relates to the technical field of display products, in particular to an organic electroluminescent device, a preparation method and a display device.
Background
OLED (Organic Light Emitting Diode, organic light-emitting semiconductor) devices have the characteristics of full solid state, self-luminescence, high contrast, wide viewing angle and the like, and are the next generation flat panel display technology after LCD (Liquid Crystal Display ) devices are mainly realized through processes such as vacuum thermal evaporation, ink Jet Printing (IJP) and the like.
In the related art, the transparent OLED device generally adopts IZO (indium zinc oxide) as a cathode to form a weak microcavity structure, so that the efficiency is low, if Mg (magnesium) or Ag (silver) is used as an electrode, FMM (Fine Metal Mask) is required to improve the transparency, but the application of FMM is extremely difficult in the preparation of a large-size OLED device, so that it is important to improve the efficiency without reducing the transparency.
Disclosure of Invention
The embodiment of the application provides an organic electroluminescent device, a preparation method and a display device, which are used for solving or relieving one or more technical problems in the prior art.
In a first aspect, an embodiment of the present application provides an organic electroluminescent device, including a first electrode, an organic layer group, a second electrode, a light extraction layer, and a metal reflective layer that are sequentially stacked; the organic layer group is prepared by an evaporation process, and the light extraction layer is prepared by a printing process; the first electrode comprises a plurality of sub-electrodes corresponding to the sub-pixels respectively, the thicknesses of the sub-electrodes are the same, and a microcavity structure is formed on one side of the metal reflecting layer facing the substrate.
In one embodiment, the light extraction layer includes a red light extraction layer, a green light extraction layer, a blue light extraction layer, and a white light extraction layer corresponding to the red, green, blue, and white sub-pixels, respectively, and the thicknesses of any two of the red, green, blue, and white light extraction layers are different.
In one embodiment, the organic electroluminescent device further comprises a bonding layer, the bonding layer is arranged between the second electrode and the light extraction layer, the bonding layer is prepared through an evaporation process, and the material of the bonding layer comprises NaF or LiF.
In one embodiment, the bonding layer has a thickness of 0.1 to 10 nanometers.
In one embodiment, the metal reflective layer is prepared by an open mask process, and the material of the metal reflective layer includes silver or silver and magnesium.
In one embodiment, the metal reflective layer is prepared by a printing process, and the material of the metal reflective layer comprises silver; the metal reflecting layer comprises a red light metal reflecting layer, a green light metal reflecting layer and a blue light metal reflecting layer which respectively correspond to the red sub-pixel, the green sub-pixel and the blue sub-pixel.
In one embodiment, the metal reflective layer includes a first metal reflective layer and a second metal reflective layer; the first metal reflecting layer is prepared through an open mask process, and the material of the metal reflecting layer comprises magnesium; the first metal reflecting layer comprises a red light metal reflecting layer, a green light metal reflecting layer and a blue light metal reflecting layer which respectively correspond to the red sub-pixel, the green sub-pixel and the blue sub-pixel; the second metal reflecting layer is prepared by a printing process, and the material of the second metal reflecting layer comprises LiQ; the second metal reflecting layer is arranged corresponding to the white sub-pixel.
In a second aspect, an embodiment of the present application further provides a method for preparing an organic electroluminescent device, including:
preparing an organic layer group by utilizing an evaporation process, wherein a first electrode is arranged on one side of the organic layer group; the first electrode comprises a plurality of sub-electrodes respectively corresponding to the plurality of sub-pixels, and the thicknesses of the plurality of sub-electrodes are the same;
preparing a second electrode on the surface of the organic layer group, which is far away from the first electrode, by utilizing a sputtering process;
preparing a light extraction layer on one side of the second electrode far from the organic layer group by using a printing process;
preparing a metal reflecting layer on one side of the light extraction layer far away from the organic layer group;
and preparing an encapsulation layer on one side of the metal reflection layer far away from the organic layer group.
In one embodiment, a metal reflective layer is prepared on a side of the light extraction layer remote from the organic layer group, comprising any one of the following:
preparing a metal reflecting layer through an open mask process, wherein the material of the metal reflecting layer comprises silver or silver and magnesium;
preparing a metal reflecting layer by a printing process, wherein the material of the metal reflecting layer comprises silver; the metal reflecting layer comprises a red light metal reflecting layer, a green light metal reflecting layer and a blue light metal reflecting layer which respectively correspond to the red sub-pixel, the green sub-pixel and the blue sub-pixel;
preparing a first metal reflecting layer by an open mask process, wherein the material of the first metal reflecting layer comprises magnesium, and the first metal reflecting layer comprises a red light metal reflecting layer, a green light metal reflecting layer and a blue light metal reflecting layer which respectively correspond to a red sub-pixel, a green sub-pixel and a blue sub-pixel; and preparing a second metal reflecting layer by a printing process, wherein the material of the second metal reflecting layer comprises LiQ, and the second metal reflecting layer is arranged corresponding to the white sub-pixel.
In a third aspect, the embodiment of the present application further provides a display device, including the organic electroluminescent device according to any one of the embodiments of the present application.
According to the technology of the embodiment of the application, the organic layer group arranged in a laminated mode is prepared through the evaporation process, the light extraction layer is prepared through the printing process, the thickness of the light extraction layer can be correspondingly set according to the wavelength of target light of each sub-pixel, and therefore the length of the microcavity structure of the metal reflection layer facing the side of the substrate is adjusted, and the strong microcavity structure is formed on the side of the metal reflection layer facing the substrate. Therefore, the organic electroluminescent device can be prepared without adopting FFM, and the luminous efficiency of RGB light of the organic electroluminescent device is remarkably improved, so that the power consumption is reduced.
The foregoing summary is for the purpose of the specification only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present application will become apparent by reference to the drawings and the following detailed description.
Drawings
In the drawings, the same reference numerals refer to the same or similar parts or elements throughout the several views unless otherwise specified. The figures are not necessarily drawn to scale. It is appreciated that these drawings depict only some embodiments according to the disclosure and are not therefore to be considered limiting of its scope.
Fig. 1 shows a schematic structural diagram of an organic electroluminescent device according to an embodiment of the present application;
fig. 2 shows a schematic structural diagram of an organic electroluminescent device according to another embodiment of the present application;
fig. 3 shows a schematic structural diagram of an organic electroluminescent device according to still another embodiment of the present application;
fig. 4 shows a flowchart of a method for manufacturing an organic electroluminescent device according to an embodiment of the present application.
Reference numerals illustrate:
an organic electroluminescent device 1; a microcavity structure 1a;
a first electrode 10;
an organic layer group 20;
a second electrode 30;
a light extraction layer 40; red light extraction layer 41; a green light extraction layer 42; a blue light extraction layer 43; a white light extraction layer 44;
a metal reflective layer 50; a first metal reflective layer 50a; a second metal reflective layer 50b; a red light metal reflective layer 51; a green light metal reflective layer 52; a blue light metal reflective layer 53;
and a bonding layer 60.
Detailed Description
Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in various different ways without departing from the spirit or scope of the present application. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
Fig. 1 shows a schematic structural view of an organic electroluminescent device 1 according to an embodiment of the present application, and as shown in fig. 1, the organic electroluminescent device 1 includes a first electrode 10, an organic layer group 20, a second electrode 30, a light extraction layer 40, and a metal reflective layer 50, which are sequentially stacked; the organic layer group 20 is prepared by an evaporation process, and the light extraction layer 40 is prepared by a printing process; the first electrode 10 includes a plurality of sub-electrodes corresponding to the plurality of sub-pixels, and the plurality of sub-electrodes have the same thickness, and a microcavity structure 1a is formed on a side of the metal reflective layer 50 facing the substrate.
In the embodiment of the present application, the organic electroluminescent device 1 may be a White Organic Light Emitting Diode (WOLED). The white organic light emitting diode is specifically formed by forming an organic film layer of a whole white OLED device on a glass substrate, and then forming red, green, blue and white sub-pixel units through patterned anodes and color filters.
In addition, the organic electroluminescent device 1 in the embodiment of the present application may use a bottom emission structure, or may use an organic light emitting diode of a top emission structure. It is understood that the organic light emitting diode may include an organic layer group 20 disposed between the first electrode 10 (i.e., anode) and the second electrode 30 (i.e., cathode), and the organic layer group 20 may include an organic light emitting layer, a hole transporting layer, and an electron transporting layer. The organic light-emitting layer may be a white light-emitting layer, or may be a red light-emitting layer, a green light-emitting layer, a blue light-emitting layer, or a plurality of light-emitting layers of other colors, and the light-emitting layers of different colors may be arranged in any order, which is not particularly limited in the embodiment of the present application. Preferably, the organic light emitting layer in the organic layer group 20 may include a blue light emitting layer, a red light emitting layer, a yellow light emitting layer, and a blue light emitting layer, which are sequentially disposed.
In other examples of the present application, the organic layer group 20 may further include an electron injection layer, an electron blocking layer, a hole injection layer, and a hole blocking layer. Under the condition of applying current, electrons are injected into the cathode, holes are formed at the anode, the electrons and the holes move towards each other through each layer, and the energy is combined in the organic light-emitting layer and released in the form of photons, and the process rapidly happens continuously when the current passes through, so that continuous light emission is realized. The organic light emitting diode is divided into a top emission structure and a bottom emission structure according to the light emitting direction. Wherein, the cathode, the organic layer group 20 and the anode of the organic light emitting diode adopting the bottom emission structure are sequentially stacked in a direction towards the substrate, and light is emitted from the anode and emitted in a direction towards the substrate. The cathode, the organic layer group 20, and the anode of the organic light emitting diode using the top emission structure are sequentially stacked in a direction away from the substrate, and light is emitted from the anode and emitted in a direction away from the substrate.
Preferably, the organic electroluminescent device 1 of the embodiment of the present application may employ a white organic light emitting diode of a top emission structure, which will be described in detail in the following description of the present application by way of example.
For example, the organic layer group 20 may form a plurality of organic film layers stacked by performing an evaporation process using an Open Mask (Open Mask). The organic electroluminescent device 1 according to the embodiment of the present application may include a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel, and the number and arrangement of the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the white sub-pixel are not specifically limited. Accordingly, the light extraction layer 40 may include a red light extraction layer 41, a green light extraction layer 42, a blue light extraction layer 43, and a white light extraction layer 44 corresponding to the red, green, blue, and white sub-pixels, respectively.
In some examples, the organic electroluminescent device 1 includes a first electrode 10, an organic layer group 20, a second electrode 30, a light extraction layer 40, and a metal reflective layer 50, which are sequentially disposed in a direction away from a substrate. Wherein the first electrode 10 may be an anode, and the material of the first electrode 10 may be ITO (indium tin oxide); the second electrode 30 may be a cathode, and a material of the second electrode 30 may include IZO (indium zinc oxide). An anode reflecting layer (not shown) is further disposed between the first electrode 10 and the substrate, and a microcavity structure 1a is formed between the anode reflecting layer and the metal reflecting layer 50. It is understood that the microcavity structure 1a may be a plurality of microcavities respectively corresponding to the red subpixel, the green subpixel and the blue subpixel. In the embodiment of the present application, the first electrode 10 includes a plurality of sub-electrodes corresponding to a plurality of sub-pixels, respectively, and a corresponding microcavity structure 1a is formed between the anode metal layer and the metal reflective layer 50 of each sub-electrode. Compared to the organic electroluminescent device in the related art, which employs a cathode (IZO) as a reflective film layer to form a weak microcavity structure, the present embodiment can form a strong microcavity structure 1a on a side of the metal reflective layer 50 facing a substrate by providing the metal reflective layer 50 on a side of the light extraction layer 40 facing away from the organic layer group 20, and the material of the metal reflective layer 50 may include silver and/or magnesium.
It can be understood that the microcavity is an optical structure for enhancing interaction of luminescent materials, and is used for transmitting photons emitted by each organic luminescent layer, the photons generated in the organic luminescent layer are limited in the microcavity, and interference enhancement on target light is realized through microcavity effect, so that the electroluminescent spectrum can be narrowed, and further, the color purity is improved, which is beneficial to display application.
The length of the microcavity corresponding to each sub-pixel may be different according to the wavelength of the target light emitted by each sub-pixel. In order to simplify the manufacturing process of the organic electroluminescent device 1, the first electrode 10 includes a plurality of sub-electrodes corresponding to the plurality of sub-pixels respectively, which have the same thickness, so that the sub-electrodes corresponding to each sub-pixel do not need to be manufactured respectively through a corresponding mask process, and the sub-electrodes corresponding to all the sub-pixels can be manufactured and formed only through one mask process. In the embodiment of the present application, the light extraction layer 40 may include a red light extraction layer 41, a green light extraction layer 42, a blue light extraction layer 43, and a white light extraction layer 44 corresponding to the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the white sub-pixel, respectively, and the thicknesses of any two of the red light extraction layer 41, the green light extraction layer 42, the blue light extraction layer 43, and the white light extraction layer 44 are different. Therefore, the length of the microcavity corresponding to each sub-pixel can be adjusted by setting the thickness of the extraction layer corresponding to each sub-pixel. The thicknesses of the red light extraction layer 41, the green light extraction layer 42, the blue light extraction layer 43, and the white light extraction layer 44 may be set according to the wavelength of the target light of the corresponding sub-pixel and the refractive index of each film structure related to the microcavity structure 1a, which is not particularly limited in the embodiment of the present application.
It should be noted that, in the related art, the OLED device needs to be manufactured by using an FMM (Fine Metal Mask), which limits the resolution (PPI) of the display panel, and makes it difficult to obtain a higher color gamut and brightness.
According to the organic electroluminescent device 1 of the embodiment of the present application, by preparing the organic layer group 20 stacked by an evaporation process and preparing the light extraction layer 40 by a printing process, the thickness of the light extraction layer 40 may be set accordingly according to the wavelength of the target light of each sub-pixel, thereby adjusting the length of the microcavity structure 1a of the metal reflective layer 50 toward the substrate side, thereby forming the strong microcavity structure 1a on the substrate side of the metal reflective layer 50. Therefore, the organic electroluminescent device 1 can be prepared without adopting FFM, and the luminous efficiency of RGB light of the organic electroluminescent device 1 is remarkably improved, so that the power consumption is reduced.
In one embodiment, the organic electroluminescent device 1 further includes a bonding layer 60, the bonding layer 60 is disposed between the second electrode 30 and the light extraction layer 40, the bonding layer 60 is prepared by an evaporation process, and a material of the bonding layer 60 includes NaF or LiF. Wherein the thickness of the bonding layer 60 may be 0.1 to 10 nanometers.
Note that, in the embodiment of the present application, the second electrode 30 may be a cathode and the material may include IZO (indium zinc oxide). Since the lyophile property of the IZO material is not good, a layer of a material having high lyophile property, such as NaF or LiF, may be coated on the surface of the second electrode 30, thereby improving the lyophile property of the surface of the second electrode 30, and thus improving the bonding effect of the light extraction layer 40 on the second electrode 30 when the light extraction layer 40 is prepared by a printing process.
In one embodiment, as shown in fig. 1, the metal reflective layer 50 is prepared by an open mask process, and the material of the metal reflective layer 50 includes silver or silver and magnesium.
Illustratively, the metal reflective layer 50 may be disposed on a side of the light extraction layer 40 away from the substrate and is disposed in common correspondence with the red light extraction layer 41, the green light extraction layer 42, the blue light extraction layer 43, and the white light extraction layer 44 included in the light extraction layer 40. In this embodiment, the material of the metal reflective layer 50 may include only silver or a mixture of silver and magnesium.
Fig. 2 shows a schematic structural diagram of an organic electroluminescent device 1 according to another embodiment of the present application, as shown in fig. 2, in one embodiment, a metal reflective layer 50 is prepared by a printing process, and a material of the metal reflective layer 50 includes silver; the metal reflective layer 50 includes a red metal reflective layer 51, a green metal reflective layer 52, and a blue metal reflective layer 53 corresponding to the red, green, and blue sub-pixels, respectively.
Illustratively, the metal reflective layer 50 may be formed by printing Ag ink on the sides of the red light extraction layer 41, the green light extraction layer 42, and the blue light extraction layer 43 included in the light extraction layer 40, which are away from the substrate, respectively, to form the corresponding red light metal reflective layer 51, green light metal reflective layer 52, and blue light metal reflective layer 53 on the red light extraction layer 41, the green light extraction layer 42, and the blue light extraction layer 43, respectively.
Fig. 3 shows a schematic structural diagram of an organic electroluminescent device 1 according to still another embodiment of the present application, as shown in fig. 3, in one embodiment, the metal reflective layer 50 includes a first metal reflective layer 50a and a second metal reflective layer 50b; the first metal reflective layer 50a is prepared by an open mask process, and the material of the metal reflective layer 50 includes magnesium; the first metal reflective layer 50a includes a red light metal reflective layer 51, a green light metal reflective layer 52, and a blue light metal reflective layer 53 corresponding to the red, green, and blue sub-pixels, respectively; the second metal reflective layer 50b is prepared by a printing process, and the material of the second metal reflective layer 50b includes LiQ (8-hydroxyquinoline-lithium); the second metal reflective layer 50b is disposed corresponding to the white sub-pixel.
For example, the second metal reflective layer 50b may be first disposed on the side of the white light extraction layer 44 remote from the substrate through a printing process. Then, the first metal reflective layers 50a are formed on the sides of the red light extraction layer 41, the green light extraction layer 42, and the blue light extraction layer 43, which are away from the substrate, respectively, by an evaporation process. It is understood that, since magnesium cannot form a film on the surface of LiQ, the first metal reflective layer 50a is not formed on the side of the second metal layer away from the substrate during the process of preparing the first metal reflective layer 50a.
In a second aspect, an embodiment of the present application further provides a method for preparing an organic electroluminescent device, which is used for preparing the organic electroluminescent device of the above embodiment of the present application. Fig. 4 illustrates a method for manufacturing an organic electroluminescent device according to an embodiment of the present application, and as illustrated in fig. 4, the method may include the steps of:
s101: preparing an organic layer group by utilizing an evaporation process, wherein a first electrode is arranged on one side of the organic layer group; the first electrode comprises a plurality of sub-electrodes respectively corresponding to the plurality of sub-pixels, and the thicknesses of the plurality of sub-electrodes are the same;
s102: preparing a second electrode on the surface of the organic layer group, which is far away from the first electrode, by utilizing a sputtering process;
s103: preparing a light extraction layer on one side of the second electrode far from the organic layer group by using a printing process;
s104: preparing a metal reflecting layer on one side of the light extraction layer far away from the organic layer group;
s105: and preparing an encapsulation layer on one side of the metal reflection layer far away from the organic layer group.
According to the preparation method of the organic electroluminescent device, the organic layer group arranged in a laminated mode is prepared through the evaporation process, the light extraction layer is prepared through the printing process, the thickness of the light extraction layer can be correspondingly set according to the wavelength of target light of each sub-pixel, and therefore the length of the microcavity structure of the metal reflecting layer facing the substrate side is adjusted, and therefore a strong microcavity structure is formed on the side of the metal reflecting layer facing the substrate. Therefore, the organic electroluminescent device can be prepared without adopting FFM, and the luminous efficiency of RGB light of the organic electroluminescent device is remarkably improved, so that the power consumption is reduced.
In one embodiment, step S104 may specifically include any one of the following:
preparing a metal reflecting layer through an open mask process, wherein the material of the metal reflecting layer comprises silver or silver and magnesium;
preparing a metal reflecting layer by a printing process, wherein the material of the metal reflecting layer comprises silver; the metal reflecting layer comprises a red light metal reflecting layer, a green light metal reflecting layer and a blue light metal reflecting layer which respectively correspond to the red sub-pixel, the green sub-pixel and the blue sub-pixel;
preparing a first metal reflecting layer by an open mask process, wherein the material of the first metal reflecting layer comprises magnesium, and the first metal reflecting layer comprises a red light metal reflecting layer, a green light metal reflecting layer and a blue light metal reflecting layer which respectively correspond to a red sub-pixel, a green sub-pixel and a blue sub-pixel; and preparing a second metal reflecting layer by a printing process, wherein the material of the second metal reflecting layer comprises LiQ, and the second metal reflecting layer is arranged corresponding to the white sub-pixel.
According to another aspect of the embodiments of the present application, a display device is also provided. The display device comprises the organic electroluminescent device of the embodiment.
In addition, other configurations of the display device of the above embodiment may be applied to various technical solutions now and in the future known to those skilled in the art, and will not be described in detail herein.
In the description of the present specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The above disclosure provides many different embodiments or examples for implementing different structures of the present application. The components and arrangements of specific examples are described above in order to simplify the disclosure of this application. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of various changes or substitutions within the technical scope of the present application, and these should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. An organic electroluminescent device is characterized by comprising a first electrode, an organic layer group, a second electrode, a light extraction layer and a metal reflecting layer which are sequentially stacked; the organic layer group is prepared through an evaporation process, and the light extraction layer is prepared through a printing process; the first electrode comprises a plurality of sub-electrodes respectively corresponding to the plurality of sub-pixels, the thicknesses of the plurality of sub-electrodes are the same, and a microcavity structure is formed on one side of the metal reflecting layer, which faces the substrate.
2. The organic electroluminescent device according to claim 1, wherein the light extraction layer includes a red light extraction layer, a green light extraction layer, a blue light extraction layer, and a white light extraction layer corresponding to the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the white sub-pixel, respectively, and the thickness of any two of the red light extraction layer, the green light extraction layer, the blue light extraction layer, and the white light extraction layer is different.
3. The organic electroluminescent device according to claim 1, further comprising a bonding layer disposed between the second electrode and the light extraction layer, the bonding layer being prepared by an evaporation process, a material of the bonding layer comprising NaF or LiF.
4. The organic electroluminescent device of claim 3, wherein the bonding layer has a thickness of 0.1 to 10 nanometers.
5. The organic electroluminescent device of claim 1, wherein the metal reflective layer is prepared by an open mask process, and the material of the metal reflective layer comprises silver or silver and magnesium.
6. The organic electroluminescent device of claim 1, wherein the metal reflective layer is prepared by a printing process, and the material of the metal reflective layer comprises silver;
the metal reflecting layer comprises a red light metal reflecting layer, a green light metal reflecting layer and a blue light metal reflecting layer which respectively correspond to the red sub-pixel, the green sub-pixel and the blue sub-pixel.
7. The organic electroluminescent device of claim 1, wherein the metal reflective layer comprises a first metal reflective layer and a second metal reflective layer;
the first metal reflecting layer is prepared through an open mask process, and the material of the metal reflecting layer comprises magnesium; the first metal reflecting layer comprises a red light metal reflecting layer, a green light metal reflecting layer and a blue light metal reflecting layer which respectively correspond to the red sub-pixel, the green sub-pixel and the blue sub-pixel;
the second metal reflecting layer is prepared by a printing process, and the material of the second metal reflecting layer comprises LiQ; the second metal reflecting layer is arranged corresponding to the white sub-pixel.
8. A method for manufacturing an organic electroluminescent device, comprising:
preparing an organic layer group by utilizing an evaporation process, wherein a first electrode is arranged on one side of the organic layer group; the first electrode comprises a plurality of sub-electrodes respectively corresponding to the plurality of sub-pixels, and the thicknesses of the plurality of sub-electrodes are the same;
preparing a second electrode on the surface of the organic layer group, which is far away from the first electrode, by utilizing a sputtering process;
preparing a light extraction layer on one side of the second electrode far from the organic layer group by using a printing process;
preparing a metal reflecting layer on one side of the light extraction layer away from the organic layer group;
and preparing an encapsulation layer on one side of the metal reflection layer far away from the organic layer group.
9. The method of manufacturing an organic electroluminescent device according to claim 8, wherein a metal reflective layer is prepared on a side of the light extraction layer remote from the organic layer group, comprising any one of:
preparing a metal reflecting layer through an open mask process, wherein the material of the metal reflecting layer comprises silver or silver and magnesium;
preparing a metal reflecting layer by a printing process, wherein the material of the metal reflecting layer comprises silver; the metal reflecting layer comprises a red light metal reflecting layer, a green light metal reflecting layer and a blue light metal reflecting layer which respectively correspond to the red sub-pixel, the green sub-pixel and the blue sub-pixel;
preparing a first metal reflecting layer through an open mask process, wherein the material of the first metal reflecting layer comprises magnesium, and the first metal reflecting layer comprises a red light metal reflecting layer, a green light metal reflecting layer and a blue light metal reflecting layer which respectively correspond to a red sub-pixel, a green sub-pixel and a blue sub-pixel; and preparing a second metal reflecting layer through a printing process, wherein the material of the second metal reflecting layer comprises LiQ, and the second metal reflecting layer is arranged corresponding to the white sub-pixel.
10. A display device comprising the organic electroluminescent device as claimed in any one of claims 1 to 7.
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| CN202311605664.6A CN117641965A (en) | 2023-11-28 | 2023-11-28 | Organic electroluminescent device, preparation method and display device |
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| CN202311605664.6A CN117641965A (en) | 2023-11-28 | 2023-11-28 | Organic electroluminescent device, preparation method and display device |
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