CN110391281B - Organic light-emitting display panel, manufacturing method thereof and display device - Google Patents
Organic light-emitting display panel, manufacturing method thereof and display device Download PDFInfo
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- CN110391281B CN110391281B CN201910646386.6A CN201910646386A CN110391281B CN 110391281 B CN110391281 B CN 110391281B CN 201910646386 A CN201910646386 A CN 201910646386A CN 110391281 B CN110391281 B CN 110391281B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/115—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers comprising active inorganic nanostructures, e.g. luminescent quantum dots
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/12—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers comprising dopants
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
- H10K71/16—Deposition of organic active material using physical vapour deposition [PVD], e.g. vacuum deposition or sputtering
Abstract
The invention discloses an organic light-emitting display panel, a manufacturing method thereof and a display device. The organic light emitting display panel includes: a first electrode and a second electrode which are oppositely arranged; and the light-emitting layer is arranged between the first electrode and the second electrode, wherein the light-emitting layer comprises at least one first sub light-emitting layer and at least one second sub light-emitting layer, the first sub light-emitting layer and the second sub light-emitting layer are arranged at intervals, the first sub light-emitting layer is composed of a host material and a guest material, and the second sub light-emitting layer is composed of a host material. The organic light-emitting display panel can adjust the position of a light-emitting center, so that the problem that a picture displayed as white under a front view angle has color cast under a large view angle is solved.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to an organic light-emitting display panel, a manufacturing method thereof and a display device.
Background
An Organic Light-Emitting Diode (OLED) display technology is a display technology with great development prospect, and an Organic Light-Emitting display panel manufactured by using the technology has the advantages of self-luminescence, ultra lightness, thinness, wide viewing angle, high response speed, low power consumption, capability of realizing flexible display and the like, and is widely applied to the display field.
The pixel structure of the conventional organic light emitting display panel is a stacked structure of an anode, an organic light emitting material, and a cathode. The colors of the light emitted by the organic light-emitting materials in different pixels are different, so that different pixels emit light with different colors, and the pixels with different colors are combined to form a picture. However, due to the difference in performance of the light with different colors, the degree of change of the brightness of the light emitted by the pixels with different colors at a large viewing angle is different, and thus, the brightness and color variation of a white image displayed by the organic light emitting display panel at a normal viewing angle occur at the large viewing angle, and the color cast is serious.
Disclosure of Invention
The invention provides an organic light-emitting display panel, a manufacturing method thereof and a display device, which can adjust the position of a light-emitting center so as to solve the problem that a picture displayed as white under a front view angle has color cast under a large view angle.
In a first aspect, an embodiment of the present invention provides an organic light emitting display panel, including:
a first electrode and a second electrode which are oppositely arranged;
and the light-emitting layer is arranged between the first electrode and the second electrode, wherein the light-emitting layer comprises at least one first sub light-emitting layer and at least one second sub light-emitting layer, the first sub light-emitting layer and the second sub light-emitting layer are arranged at intervals, the first sub light-emitting layer is composed of a host material and a guest material, and the second sub light-emitting layer is composed of a host material.
Optionally, the light emitting layer includes a first sub light emitting layer and a second sub light emitting layer;
the first sub-luminescent layer is close to the first electrode, and the second sub-luminescent layer is close to the second electrode; or the first sub-light-emitting layer is close to the second electrode, and the second sub-light-emitting layer is close to the first electrode.
Optionally, the thickness of the first sub-light emitting layer is less than or equal to 20 nm.
Optionally, the thickness of the first sub-light emitting layer is 3nm to 10 nm.
Optionally, the light emitting layer includes two first sub light emitting layers and three second sub light emitting layers.
Optionally, the guest material is a phosphorescent material and/or a fluorescent material.
Optionally, the organic light emitting display panel further includes:
a hole injection layer, a hole transport layer and an electron blocking layer which are arranged between the first electrode and the luminescent layer in sequence;
and the hole blocking layer, the electron transport layer and the electron injection layer are sequentially arranged between the light-emitting layer and the second electrode.
In a second aspect, embodiments of the present invention also provide a display device including an organic light emitting display panel having any one of the features of the first aspect.
In a third aspect, an embodiment of the present invention further provides a method for manufacturing an organic light emitting display panel, including:
forming a thin film transistor layer on a substrate;
sequentially forming a first electrode, a hole injection layer, a hole transport layer, a luminescent layer, an electron transport layer, an electron injection layer and a second electrode on the thin film transistor layer; the light-emitting layer comprises at least one first sub light-emitting layer and at least one second sub light-emitting layer, the first sub light-emitting layer and the second sub light-emitting layer are arranged at intervals, the first sub light-emitting layer is made of a host material and a guest material, and the second sub light-emitting layer is made of a host material.
Optionally, the evaporation source of the host material is not provided with a switch, and the evaporation source of the guest material is provided with a switch; the method for forming the light-emitting layer specifically comprises the following steps:
opening a switch of an evaporation source of the guest material, wherein the evaporation source of the guest material and the evaporation source of the host material jointly form a first sub-luminescent layer;
and closing the switch of the evaporation source of the guest material, and forming a second sub-luminescent layer by the evaporation source of the host material.
The invention provides an organic light-emitting display panel, a manufacturing method thereof and a display device, wherein a light-emitting layer is designed to comprise at least one first sub-light-emitting layer and at least one second sub-light-emitting layer which are arranged at intervals, and the first sub-light-emitting layer is composed of a host material and an object material, and the second sub-light-emitting layer is only composed of the host material, so that the first sub-light-emitting layer emits light, and the second sub-light-emitting layer does not emit light, thereby controlling the light-emitting area of the organic light-emitting display panel in the first sub-light-emitting layer, further realizing the adjustment of the position of the light-emitting center of the organic light-emitting display panel, and improving the problem that a white picture is subjected to color cast under a large viewing angle under a front viewing angle.
Drawings
Fig. 1 is a schematic cross-sectional view illustrating an organic light emitting display panel according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view illustrating another organic light emitting display panel according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view illustrating another organic light emitting display panel according to an embodiment of the present invention;
fig. 4 is a schematic flowchart of a method for fabricating an organic light emitting display panel according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating operation of a host-guest evaporation source of an organic light emitting display panel according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Also, the drawings and description of the embodiments are to be regarded as illustrative in nature, and not as restrictive. Like reference numerals refer to like elements throughout the specification. In addition, the thickness of some layers, films, panels, regions, etc. may be exaggerated in the drawings for understanding and ease of description. It will also be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. In addition, "on … …" means that an element is positioned on or under another element, but does not essentially mean that it is positioned on the upper side of the other element according to the direction of gravity. For ease of understanding, the figures of the present invention depict one element on top of another.
Additionally, unless explicitly described to the contrary, the word "comprise", and variations such as "comprises" or "comprising", will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.
It should also be noted that references to "and/or" in embodiments of the invention are intended to include any and all combinations of one or more of the associated listed items. Various components are described in embodiments of the present invention with "first", "second", "third", and the like, but these components should not be limited by these terms. These terms are only used to distinguish one component from another. Also, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
While certain embodiments may be practiced differently, the specific process sequence may be performed differently than that described. For example, two processes described consecutively may be performed at substantially the same time or in an order reverse to that described.
The white light emitted by the existing organic light emitting display panel consists of three primary colors of red, green and blue. However, due to the difference in performance of the light of the three colors red, green and blue, the degree of attenuation of the light of the three colors red, green and blue is not uniform with the increase of the viewing angle, and the color of the white light will change, i.e. white color shift will occur. Experiments show that the color shift and the brightness attenuation degree of light are directly related to the position of the light-emitting center of the organic light-emitting display panel, so that the embodiment of the invention provides the organic light-emitting display panel, the manufacturing method thereof and the display device, which can adjust the position of the light-emitting center, thereby solving the problem that a picture displayed as white under a front viewing angle has color shift under a large viewing angle.
Hereinafter, the structure of the organic light emitting display panel and technical effects thereof will be described in detail.
An embodiment of the present invention provides an organic light emitting display panel, including: the first electrode and the second electrode are oppositely arranged; and the light-emitting layer is arranged between the first electrode and the second electrode and comprises at least one first sub light-emitting layer and at least one second sub light-emitting layer, the first sub light-emitting layer and the second sub light-emitting layer are arranged at intervals, the first sub light-emitting layer is composed of a host material and a guest material, and the second sub light-emitting layer is composed of a host material.
The structure of the light-emitting layer mainly comprises any one of the following two scenes:
the first light-emitting layer comprises a first sub light-emitting layer and a second sub light-emitting layer.
The first sub-luminescent layer is close to the first electrode, and the second sub-luminescent layer is close to the second electrode; or the first sub-light-emitting layer is close to the second electrode, and the second sub-light-emitting layer is close to the first electrode.
In the first scenario, since only one layer of the first sub-light emitting layer is disposed, the thickness of the first sub-light emitting layer is easily controlled in practical application, so that the position of the light emitting center of the organic light emitting display panel is conveniently adjusted, the manufacturing is easy, and the purpose of improving the color cast of a white picture displayed under a front viewing angle under a large viewing angle is achieved.
And a second light emitting layer comprises a first sub light emitting layer and a second sub light emitting layer, and the sum of the numbers of the first sub light emitting layer and the second sub light emitting layer is greater than or equal to three layers.
Specifically, the sum of the numbers of the first sub-light emitting layer and the second sub-light emitting layer is greater than or equal to three layers, including but not limited to the following cases:
a: the light emitting layer includes a first sub light emitting layer and two second sub light emitting layers (for convenience of distinction, hereinafter referred to as a second sub light emitting layer 1 and a second sub light emitting layer 2), and the second sub light emitting layer 1, the first sub light emitting layer and the second sub light emitting layer 2 are sequentially arranged along a direction from the first electrode to the second electrode;
b: the light emitting layer includes two first sub light emitting layers (hereinafter referred to as a first sub light emitting layer 1 and a first sub light emitting layer 2 for convenience of distinction) and one second sub light emitting layer, and the first sub light emitting layer 1, the second sub light emitting layer, and the first sub light emitting layer 2 are sequentially arranged along a direction from the first electrode to the second electrode;
c: the light emitting layer comprises at least two first sub light emitting layers and at least two second sub light emitting layers, and the first sub light emitting layers and the second sub light emitting layers are arranged at intervals.
In the second scenario, because the first sub-light emitting layer and the second sub-light emitting layer are arranged at intervals, in practical application, the position of the light emitting center of the organic light emitting display panel can be flexibly adjusted by setting the position of the first sub-light emitting layer, so that the purpose of improving the color cast of a white picture displayed under a front viewing angle under a large viewing angle is achieved.
In addition, the following embodiments are all exemplified by the organic light emitting display panel being rectangular, and in practical applications, the organic light emitting display panel may also be regular or irregular in shape such as circular, polygonal, and the like, which is not particularly limited by the present invention. Meanwhile, in order to more clearly describe the light emitting layer in the organic light emitting display panel, the following drawings of the embodiments of the present invention correspondingly adjust the size of each structure in the organic light emitting display panel.
Fig. 1 is a schematic cross-sectional view illustrating an organic light emitting display panel according to an embodiment of the present invention. Illustratively, the organic light emitting display panel includes a first electrode 11 and a second electrode 12 disposed opposite to each other; and a light emitting layer 13 disposed between the first electrode 11 and the second electrode 12, wherein the light emitting layer 13 includes a first sub light emitting layer 131 and a second sub light emitting layer 132, the first sub light emitting layer 131 and the second sub light emitting layer 132 are arranged at intervals, the first sub light emitting layer 131 is in contact with the second sub light emitting layer 132, the first sub light emitting layer 131 is close to the first electrode 11, and the second sub light emitting layer 132 is close to the second electrode 12.
Optionally, the first electrode 11 is an anode and the second electrode 12 is a cathode. The material of the first electrode 11 comprises indium tin oxide or indium zinc oxide, the material of the second electrode 12 comprises a metal material or a metal alloy material, and the thickness of the metal film layer or the metal alloy film layer of the second electrode 12 is very thin, so that the second electrode 12 can exhibit semi-permeability to allow light to pass through. In the present invention, the materials of the first electrode 11 and the second electrode 12 include, but are not limited to, the above examples, and the relevant practitioner can select the materials of the first electrode 11 and the second electrode 12 according to the light emitting mode of the product, and the invention is not limited in particular.
Further, the organic light emitting display panel further includes: a hole injection layer 14 and a hole transport layer 15 which are provided in this order between the first electrode 11 and the light-emitting layer 13; an electron transport layer 16 and an electron injection layer 17 which are sequentially disposed between the light emitting layer 13 and the second electrode 12.
Optionally, the organic light emitting display panel further includes: an electron blocking layer 18 provided between the hole transport layer 15 and the light emitting layer 13; and a hole blocking layer 19 disposed between the light-emitting layer 13 and the electron transport layer 16.
The first sub-light emitting layer 131 is composed of a host material and a guest material, and the second sub-light emitting layer 132 is composed of a host material. The main material has good electron or hole transmission property, good film forming property and thermal stability; the guest material has a light emitting characteristic with high quantum efficiency, the quantum efficiency refers to the ratio of collected electrons to absorbed photons, the higher the quantum efficiency is, the higher the light emitting efficiency of the light emitting device is, the guest material can generate various color emission peaks such as red (R), green (G), blue (B) or yellow (Y), however, the guest material has problems such as excited state quenching and the like in a solid state and causes the emission peaks to be widened or moved, so that the guest material can be doped into the host material to avoid excited state quenching and simultaneously avoid the emission peaks to be widened or moved, and the color purity is improved. In addition, the absorption spectrum of the guest material needs to overlap with the emission spectrum of the host material, and the energies of the host material and the guest material need to be adapted so that triplet energy of the host material is easily transferred to the guest material, whereby the first sub-light emitting layer 131 can realize electroluminescence.
Alternatively, the HOST material may be, but is not limited to, TCTA (phosphorescent HOST material), Bphen (phenanthroline), NPB (amine derivative), be (pp)2 (bis (2-hydroxyphenyl pyridine) beryllium), CBP (4,4 '-N, N' -dicarbazolbiphenyl), and the like.
The guest material can be a phosphorescent material and/or a fluorescent material, wherein the phosphorescent material has high exciton utilization rate and can improve the luminous efficiency of the organic light-emitting display panel; the fluorescent material has low cost and is easy to obtain, and the manufacturing cost of the organic light-emitting display panel can not be increased. Specifically, the guest material may be, but not limited to, ir (ppy)3 (tris (2-phenylpyridine) iridium), ir (ppy)2acac (bis (2-phenylpyridine) iridium acetylacetonate), ir (mdq)2acac ((acetylacetonato) bis (2-methyldibenzo [ F, H ] quinoxaline) iridium), FIrpic (bis (4, 6-difluorophenylpyridine-N, C2') picolinoylated iridium), C545T, Alq3 (8-hydroxyquinoline aluminum), and the like.
As can be seen from fig. 1, the first sub-light emitting layer 131 may implement electroluminescence, and the second sub-light emitting layer 132 is composed of only a host material, not including a guest material, and thus the second sub-light emitting layer 132 does not emit light. Compared with the existing organic light-emitting display panel which emits light as a whole, the embodiment of the invention can control the light-emitting area of the organic light-emitting display panel in the first sub-light-emitting layer, and adjust the thickness of the first sub-light-emitting layer, so that the position of the light-emitting center of the organic light-emitting display panel can be adjusted, and the problem that a white picture displayed under a front view angle has color cast under a large view angle is solved. Illustratively, when the guest material is a phosphorescent material, the phosphorescent exciton diffusion length is longer, the first sub-emitting layer can be thicker, and the adjustment range of the light-emitting center is larger. For example, TCTA is used as a host material, a phosphorescent material ir (ppy)3 is used as a guest material, the total thickness of the first sub-light emitting layer 131 and the second sub-light emitting layer 132 is 40nm, and the thickness of the first sub-light emitting layer 131 is 6nm, so that the position of the first sub-light emitting layer 131 can be changed in the whole light emitting layer, and the viewing angle characteristic can be adjusted, and the second sub-light emitting layer 132 does not emit light. Also exemplarily, TCTA is used as a host material, a fluorescent material C545T is used as a guest material, the thickness of the first sub-luminescent layer 131 is 6nm, and the sum of the thicknesses of the first sub-luminescent layer 131 and the second sub-luminescent layer 132 needs to be controlled within 20nm to ensure that the energy on the host can be completely transferred to the guest.
Fig. 2 is a schematic cross-sectional view illustrating another organic light emitting display panel according to an embodiment of the present invention. Unlike the organic light emitting display panel shown in fig. 1, the first sub-light emitting layer 131 is adjacent to the second electrode 12, and the second sub-light emitting layer 132 is adjacent to the first electrode 11.
It should be noted that, in practical applications, whether the first sub-light emitting layer 131 is close to the first electrode 11 or the second electrode 12 may be selected according to practical needs, and this is not particularly limited in the embodiment of the present invention.
Alternatively, the thickness of the first sub-light emitting layer 131 is less than or equal to 20 nm. In order to precisely control the position of the light emitting center of the organic light emitting display panel, the thickness of the first sub-light emitting layer 131 may be as thin as possible, for example, the thickness of the first sub-light emitting layer 131 is 3nm to 10nm, or the thickness of the first sub-light emitting layer 131 is 5nm, which not only ensures the light emitting effect of the first sub-light emitting layer 131, but also precisely controls the position of the light emitting center of the organic light emitting display panel within a small range.
The thickness of the second sub-emission layer 132 may be designed according to actual requirements. In order to secure the microcavity thickness of the organic light emitting display panel, the overall thickness of the light emitting layer 13 is generally designed to be about 40 nm.
Optionally, the first electrode 11 is an anode and the second electrode 12 is a cathode. The material of the first electrode 11 comprises indium tin oxide or indium zinc oxide, the material of the second electrode 12 comprises a metal material or a metal alloy material, and the thickness of the metal film layer or the metal alloy film layer of the second electrode 12 is very thin, so that the second electrode 12 can exhibit semi-permeability to allow light to pass through. In the present invention, the materials of the first electrode 11 and the second electrode 12 include, but are not limited to, the above examples, and the relevant practitioner can select the materials of the first electrode 11 and the second electrode 12 according to the light emitting mode of the product, and the invention is not limited in particular.
Fig. 3 is a schematic cross-sectional view illustrating another organic light emitting display panel according to an embodiment of the present invention. Illustratively, the organic light emitting display panel includes a first electrode 11 and a second electrode 12 disposed opposite to each other; and a light emitting layer 13 disposed between the first electrode 11 and the second electrode 12, wherein the light emitting layer 13 includes two first sub light emitting layers 131 (for convenience of distinction, respectively labeled as a first sub light emitting layer 131a and a first sub light emitting layer 131b in fig. 3) and three second sub light emitting layers 132 (for convenience of distinction, respectively labeled as a second sub light emitting layer 132a, a second sub light emitting layer 132b, and a second sub light emitting layer 132c in fig. 3), the second sub light emitting layers 132a, the first sub light emitting layers 131a, the second sub light emitting layers 132b, the first sub light emitting layers 131b, and the second sub light emitting layers 132c are sequentially arranged along a direction from the first electrode 11 to the second electrode 12 (a direction from bottom to top in fig. 3), that is, the second sub light emitting layer 132a is in contact with the first sub light emitting layer 131a, the first sub light emitting layers 131a is in contact with the second sub light emitting layers 132b, and the second sub light emitting layers 132b is in contact with the first sub light emitting layers 131b, the first sub-light emitting layer 131b contacts the second sub-light emitting layer 132 c.
Further, the organic light emitting display panel further includes: a hole injection layer 14 and a hole transport layer 15 which are provided in this order between the first electrode 11 and the light-emitting layer 13; an electron transport layer 16 and an electron injection layer 17 which are sequentially disposed between the light emitting layer 13 and the second electrode 12.
Optionally, the organic light emitting display panel further includes: an electron blocking layer 18 provided between the hole transport layer 15 and the light emitting layer 13; and a hole blocking layer 19 disposed between the light-emitting layer 13 and the electron transport layer 16.
Optionally, the first electrode 11 is an anode, and the second electrode 12 is a cathode. The material of the first electrode 11 comprises indium tin oxide or indium zinc oxide, the material of the second electrode 12 comprises a metal material or a metal alloy material, and the thickness of the metal film layer or the metal alloy film layer of the second electrode 12 is very thin, so that the second electrode 12 can exhibit semi-permeability to allow light to pass through. In the present invention, the materials of the first electrode 11 and the second electrode 12 include, but are not limited to, the above examples, and the relevant practitioner can select the materials of the first electrode 11 and the second electrode 12 according to the light emitting mode of the product, and the invention is not limited in particular.
Alternatively, the thickness of the first sub-light emitting layer 131 is less than or equal to 20 nm. In order to precisely control the position of the light emitting center of the organic light emitting display panel, the thickness of the first sub-light emitting layer 131 may be as thin as possible, for example, the thickness of the first sub-light emitting layer 131 is 3nm to 10nm, or the thickness of the first sub-light emitting layer 131 is 5nm, which not only ensures the light emitting effect of the first sub-light emitting layer 131, but also precisely controls the position of the light emitting center of the organic light emitting display panel within a small range.
The thickness of the second sub-emission layer 132 may be designed according to actual requirements. In order to secure the microcavity thickness of the organic light emitting display panel, the overall thickness of the light emitting layer 13 is generally designed to be about 40 nm.
An embodiment of the present invention provides an organic light emitting display panel, including: a first electrode and a second electrode which are oppositely arranged; and the light-emitting layer is arranged between the first electrode and the second electrode, wherein the light-emitting layer comprises at least one first sub light-emitting layer and at least one second sub light-emitting layer, the first sub light-emitting layer and the second sub light-emitting layer are arranged at intervals, the first sub light-emitting layer is composed of a host material and a guest material, and the second sub light-emitting layer is composed of a host material. The light-emitting layer is designed to comprise at least one first sub-light-emitting layer and at least one second sub-light-emitting layer which are arranged at intervals, the first sub-light-emitting layer is made of a host material and a guest material, and the second sub-light-emitting layer is made of the host material only, so that the first sub-light-emitting layer emits light, and the second sub-light-emitting layer does not emit light, so that a light-emitting area of the organic light-emitting display panel can be controlled in the first sub-light-emitting layer, the position of a light-emitting center of the organic light-emitting display panel is adjusted, and the problem that a picture which is displayed as white under a front viewing angle has color cast under a large viewing angle is solved.
Fig. 4 is a schematic flow chart illustrating a method for manufacturing an organic light emitting display panel according to an embodiment of the present invention. As shown in fig. 4, a method for manufacturing an organic light emitting display panel according to an embodiment of the present invention may include steps S101 and S102:
and S101, forming a thin film transistor layer on the substrate.
S102, sequentially forming a first electrode, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer and a second electrode on the thin film transistor layer; the light-emitting layer comprises at least one first sub light-emitting layer and at least one second sub light-emitting layer, the first sub light-emitting layer and the second sub light-emitting layer are arranged at intervals, the first sub light-emitting layer is made of a host material and a guest material, and the second sub light-emitting layer is made of a host material.
Specifically, the evaporation source of the host material is not provided with a switch, and the evaporation source of the guest material is provided with a switch; the method for forming the light-emitting layer specifically comprises the following steps:
A. opening a switch of an evaporation source of the guest material, wherein the evaporation source of the guest material and the evaporation source of the host material jointly form a first sub-luminescent layer;
B. and closing the switch of the evaporation source of the guest material, and forming a second sub-light-emitting layer by the evaporation source of the host material.
Fig. 5 is a schematic diagram illustrating an operation of a host-guest evaporation source of an organic light emitting display panel according to an embodiment of the present invention. The light emitting layer includes a first sub-light emitting layer a and a second sub-light emitting layer B, an evaporation source 100 of host material and an evaporation source 200 of guest material are correspondingly disposed above the light emitting layer, and a switch 300 (e.g., a shutter) is disposed on the evaporation source 200 of guest material. As shown in fig. 5(a), when the first sub-emitting layer a is formed, the switch 300 is turned on, the evaporation source 200 of the guest material can normally evaporate the guest material on the organic light emitting display panel, and the evaporation source 100 of the host material normally operates to form the first sub-emitting layer a composed of the host material and the guest material; as shown in fig. 5(B), when the second sub-light-emitting layer B is formed, the switch 300 is turned off, the evaporation source 200 of the guest material is not operated, and the evaporation source 100 of the host material is normally operated, so that the second sub-light-emitting layer B formed of only the host material is formed. The manufacturing method is simple and easy to realize, and the manufacturing cost of the organic light-emitting display panel cannot be increased.
It will be understood by those skilled in the art that when the guest or host material is composed of a plurality of materials, the guest or host material may be prepared by a pre-mixing re-evaporation process or a direct evaporation process according to the product or process, and the embodiment of the present invention is not particularly limited thereto.
Embodiments of the present invention also provide a display device including an organic light emitting display panel having any of the features described in the above embodiments.
The organic light emitting display panel may be a flexible organic light emitting display panel or a non-flexible organic light emitting display panel. The light emitting mode of the organic light emitting display panel may be top emission, bottom emission, or dual emission.
The display device provided by the embodiment of the invention can be applied to intelligent wearable equipment (such as an intelligent bracelet and an intelligent watch) and also can be applied to equipment such as an intelligent mobile phone, a tablet personal computer and a display.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. An organic light emitting display panel, comprising:
a first electrode and a second electrode which are oppositely arranged;
a light emitting layer disposed between the first electrode and the second electrode, wherein the light emitting layer includes at least one first sub light emitting layer and at least one second sub light emitting layer, the first sub light emitting layer and the second sub light emitting layer are arranged at intervals, the first sub light emitting layer is composed of a host material and a guest material, and the second sub light emitting layer is composed of a host material;
wherein the sum of the numbers of the first sub light emitting layers and the second sub light emitting layers is greater than or equal to three layers.
2. The organic light-emitting display panel according to claim 1, wherein a thickness of the first sub light-emitting layer is less than or equal to 20 nm.
3. The organic light-emitting display panel according to claim 2, wherein the thickness of the first sub light-emitting layer is 3nm to 10 nm.
4. The organic light-emitting display panel according to claim 1, wherein the light-emitting layer includes two layers of the first sub light-emitting layer and three layers of the second sub light-emitting layer.
5. The organic light-emitting display panel according to claim 1, wherein the guest material is a phosphorescent material and/or a fluorescent material.
6. The organic light-emitting display panel according to claim 1, further comprising:
a hole injection layer, a hole transport layer and an electron blocking layer which are sequentially arranged between the first electrode and the light-emitting layer;
and the hole blocking layer, the electron transport layer and the electron injection layer are sequentially arranged between the light-emitting layer and the second electrode.
7. A display device comprising the organic light emitting display panel according to any one of claims 1 to 6.
8. A method for manufacturing an organic light emitting display panel includes:
forming a thin film transistor layer on a substrate;
sequentially forming a first electrode, a hole injection layer, a hole transport layer, a luminescent layer, an electron transport layer, an electron injection layer and a second electrode on the thin film transistor layer; the light-emitting layer comprises at least one first sub light-emitting layer and at least one second sub light-emitting layer, the first sub light-emitting layer and the second sub light-emitting layer are arranged at intervals, the first sub light-emitting layer is made of a host material and a guest material, and the second sub light-emitting layer is made of a host material;
wherein the sum of the numbers of the first sub light emitting layers and the second sub light emitting layers is greater than or equal to three layers.
9. The method of manufacturing an organic light-emitting display panel according to claim 8, wherein a switch is not provided in the evaporation source of the host material, and a switch is provided in the evaporation source of the guest material; the method for forming the light-emitting layer specifically comprises the following steps:
turning on a switch of an evaporation source of the guest material, the evaporation source of the guest material and the evaporation source of the host material forming the first sub-light-emitting layer together;
and closing a switch of the evaporation source of the guest material, and forming the second sub-light-emitting layer by the evaporation source of the host material.
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| CN106784363A (en) * | 2016-11-24 | 2017-05-31 | 上海天马有机发光显示技术有限公司 | A kind of organic electroluminescence display panel, electronic equipment and preparation method |
| CN108264478A (en) * | 2016-12-30 | 2018-07-10 | 昆山国显光电有限公司 | Carrier transmission material and carrier blocking layers and organic luminescent device |
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| CN106784363A (en) * | 2016-11-24 | 2017-05-31 | 上海天马有机发光显示技术有限公司 | A kind of organic electroluminescence display panel, electronic equipment and preparation method |
| CN108264478A (en) * | 2016-12-30 | 2018-07-10 | 昆山国显光电有限公司 | Carrier transmission material and carrier blocking layers and organic luminescent device |
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