Quantum dot light-emitting device, display device and manufacturing method

Abstract

The embodiments of the present disclosure provide a quantum dot light-emitting device, a display device, and a manufacturing method. The quantum dot light-emitting device has a substrate and a plurality of sub-pixels with different light-emitting colors located on one side of the substrate, wherein the sub-pixels include: a first electrode; a quantum dot light-emitting portion, the quantum dot light-emitting portion being located on a side of the first electrode away from the substrate; an electrical response portion, the electrical response portion being located between the first electrode and the quantum dot light-emitting portion and having a conjugated polymer or a reaction product of the conjugated polymer, the electrical response portion being configured to have different surface contact properties by adjusting the voltage of the first electrode when forming the quantum dot light-emitting portion, the surface contact properties being hydrophilic or hydrophobic; and a second electrode, the second electrode being located on a side of the quantum dot light-emitting portion away from the electrical response portion.

Description

Technical Field

[0001] The present disclosure relates to the field of semiconductor technology, and in particular to a quantum dot light-emitting device, a display device, and a manufacturing method. Background Art

[0002] With the in-depth development of quantum dot technology, research on electro-quantum dot light-emitting diodes has become increasingly in-depth, and quantum efficiency has continued to improve, basically reaching the level of industrialization. Further adopting new processes and technologies to achieve its industrialization has become a future trend. Using quantum dots for patterning to achieve high-resolution electro-quantum dot light-emitting diodes has become an important topic. Summary of the Invention

[0003] The present disclosure provides a quantum dot light-emitting device comprising a substrate and a plurality of sub-pixels with different light-emitting colors located on one side of the substrate, wherein the sub-pixels include:

[0004] a first electrode;

[0005] a quantum dot light-emitting portion, the quantum dot light-emitting portion being located on a side of the first electrode away from the base substrate;

[0006] an electric response portion, the electric response portion being located between the first electrode and the quantum dot light-emitting portion and comprising a conjugated polymer or a reaction product of the conjugated polymer, wherein the electric response portion is configured to have different surface contact properties by adjusting the voltage of the first electrode when forming the quantum dot light-emitting portion, wherein the surface contact properties are hydrophilic or hydrophobic;

[0007] A second electrode is located on a side of the quantum dot light-emitting portion away from the electrical response portion.

[0008] In a possible implementation, the electrical response portion of some of the sub-pixels contains the conjugated polymer, and the electrical response portion of some of the sub-pixels contains an oxidation product of the conjugated polymer after an oxidation reaction.

[0009] In one possible embodiment, the conjugated polymer is one of the following:

[0010] Among them, n1>1;

[0011] Among them, n2>1.

[0012] In one possible embodiment, the oxidation product is one of the following:

[0013] Among them, n3>1;

[0014] Among them, n4>1;

[0015] Among them, n5>1;

[0016] Among them, n6>1.

[0017] In a possible implementation manner, the electrical response portion is a porous structure.

[0018] In a possible implementation manner, the quantum dot light-emitting portions of all the sub-pixels have the same surface contact performance.

[0019] In one possible implementation, the quantum dot ends of the quantum dot light-emitting portion are connected to one or a combination of the following:

[0020] hydroxyl group;

[0021] carboxyl.

[0022] In one possible implementation, the quantum dot ends of the quantum dot light-emitting portion are connected to one or a combination of the following:

[0023] alkyl;

[0024] Aromatic hydrocarbon group.

[0025] In a possible implementation manner, the quantum dot light-emitting portion is in direct contact with the electrical response portion.

[0026] In a possible implementation manner, a front membrane layer is further provided between the first electrode and the electrical response portion.

[0027] In one possible embodiment, the front film layer is an electron transport layer; or, the front film layer includes a stacked hole injection layer and a hole transport layer, and the hole transport layer is located on the side of the hole injection layer away from the first electrode.

[0028] The embodiments of the present disclosure also provide a display device, which includes the quantum dot light-emitting device provided in the embodiments of the present disclosure.

[0029] The present disclosure also provides a method for manufacturing a quantum dot light-emitting device, which includes:

[0030] forming a first electrode of each sub-pixel on one side of the base substrate;

[0031] forming an electric response portion containing a conjugated polymer in the initial state of each sub-pixel;

[0032] Sequentially forming quantum dot light-emitting portions of the sub-pixels of different light-emitting colors, wherein the sub-pixel to be currently formed with the quantum dot light-emitting portion is used as a target sub-pixel, and sequentially forming quantum dot light-emitting portions of the sub-pixels of different light-emitting colors includes: forming the quantum dot light-emitting portion of the target sub-pixel;

[0033] Wherein, the quantum dot light-emitting portion forming the target sub-pixel includes:

[0034] Adjusting the surface contact properties of the electrical response portion and / or the quantum dot light-emitting portion so that the surface contact properties of the exposed surface of the target sub-pixel are different from the surface contact properties of the exposed surfaces of the remaining sub-pixels; wherein the surface contact properties are hydrophilic or hydrophobic;

[0035] A quantum dot light-emitting portion is formed, the surface contact performance of which is the same as the surface contact performance of the exposed surface of the target sub-pixel.

[0036] In one possible implementation, the target sub-pixel is a first sub-pixel in which the quantum dot light-emitting portion is to be formed for the first time, and adjusting the surface contact properties of the electrical response portion and / or the quantum dot light-emitting portion so that the surface contact properties of the exposed surface of the target sub-pixel are different from the surface contact properties of the exposed surfaces of the remaining sub-pixels includes:

[0037] In a solution state containing a reactant, a first voltage is applied to the first electrode of the first sub-pixel to cause an oxidation reaction of the conjugated polymer in the first sub-pixel.

[0038] In one possible implementation, the target sub-pixel is a second sub-pixel of the quantum dot light-emitting portion to be formed for a second time, and adjusting the surface contact properties of the electrical response portion and / or the quantum dot light-emitting portion so that the surface contact properties of the exposed surface of the target sub-pixel are different from the surface contact properties of the exposed surfaces of the remaining sub-pixels includes:

[0039] In a solution state containing a reactant, a second voltage is applied to the sub-pixels other than the first sub-pixel and the second sub-pixel to cause an oxidation reaction of the conjugated polymer in the sub-pixels other than the first sub-pixel and the second sub-pixel.

[0040] In one possible implementation, the target sub-pixel is a third sub-pixel in which the quantum dot light-emitting portion is to be formed for a third time, and adjusting the surface contact properties of the electrical response portion and / or the quantum dot light-emitting portion so that the surface contact properties of the exposed surface of the target sub-pixel are different from the surface contact properties of the exposed surfaces of the remaining sub-pixels includes:

[0041] applying a third voltage to the first electrode of the third sub-pixel in a solution state containing a reactant, so as to cause a reduction reaction of the reaction product of the conjugated polymer in the third sub-pixel;

[0042] Ligand exchange is performed to convert the surface contact performance of the quantum dot film of the second sub-pixel into the same surface contact performance as that of the quantum dot film of the first sub-pixel.

[0043] In one possible implementation, the target sub-pixel is a third sub-pixel in which the quantum dot light-emitting portion is to be formed for a third time, and adjusting the surface contact properties of the electrical response portion and / or the quantum dot light-emitting portion so that the surface contact properties of the exposed surface of the target sub-pixel are different from the surface contact properties of the exposed surfaces of the remaining sub-pixels includes:

[0044] Ligand exchange is performed to convert the surface contact performance of the quantum dot film of the first sub-pixel into the same surface contact performance as that of the quantum dot film of the second sub-pixel.

[0045] In a possible implementation manner, after forming the quantum dot light-emitting portion having the same surface contact performance as the surface contact performance of the exposed surface of the target sub-pixel, the manufacturing method further includes:

[0046] By ligand exchange, the quantum dot light-emitting parts of all the sub-pixels are converted to have the same surface contact performance.

[0047] In a possible implementation manner, forming the electric response portion containing a conjugated polymer in the initial state of each sub-pixel includes:

[0048] By means of electro-deposition, an electric response portion containing a conjugated polymer in the initial state of each sub-pixel is formed. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is one of the structural schematic diagrams of the quantum dot light-emitting device provided in an embodiment of the present disclosure;

[0050] Figure 2 A schematic diagram of a redox reaction of a conjugated polymer provided in an embodiment of the present disclosure;

[0051] Figure 3 The second structural diagram of the quantum dot light-emitting device provided in the embodiment of the present disclosure;

[0052] Figure 4 The third structural diagram of the quantum dot light-emitting device provided in the embodiment of the present disclosure;

[0053] Figure 5 This is a fourth structural diagram of a quantum dot light-emitting device provided in an embodiment of the present disclosure;

[0054] Figure 6 A schematic diagram of the manufacturing process of a quantum dot light-emitting device is provided for an embodiment of the present disclosure;

[0055] Figure 7 A schematic diagram of forming a first quantum dot light-emitting portion according to an embodiment of the present disclosure;

[0056] Figure 8 A schematic diagram of forming a second type of quantum dot light-emitting portion according to an embodiment of the present disclosure;

[0057] Figure 9 A schematic diagram of forming a third type of quantum dot light-emitting portion according to an embodiment of the present disclosure;

[0058] Figure 10 A schematic diagram of another embodiment of the present disclosure for forming a third type of quantum dot light-emitting portion;

[0059] Figure 11 A schematic diagram of converting all quantum dot light-emitting portions into hydrophilic surfaces according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0061] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by persons of ordinary skill in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0062] In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits detailed descriptions of known functions and known components.

[0063] The present disclosure provides a quantum dot light emitting device. Figure 1 As shown, there is a base substrate 1 and a plurality of sub-pixels X with different light emitting colors located on one side of the base substrate 1, for example, including a first sub-pixel X1 emitting a first color (for example, red), a second sub-pixel X2 emitting a second color (for example, green), and a third sub-pixel X3 emitting a third color (for example, blue). A pixel defining layer 6 may be provided between adjacent sub-pixels X, wherein the sub-pixels X include:

[0064] First electrode 20; for example, the first sub-pixel X1 has a first sub-electrode 21, the second sub-pixel X2 has a second sub-electrode 22, and the third sub-pixel X3 has a third sub-electrode 23; the first electrodes 20 of different sub-pixels X constitute the first electrode layer 2;

[0065] The quantum dot light-emitting portion 40 is located on the side of the first electrode 20 facing away from the base substrate 1; for example, the first sub-pixel X1 has a first sub-quantum dot light-emitting portion 41 that emits red light, the second sub-pixel X2 has a second sub-quantum dot light-emitting portion 42 that emits green light, and the third sub-pixel X3 has a third sub-quantum dot light-emitting portion 43 that emits blue light; the quantum dot light-emitting portions 40 of different sub-pixels X constitute the quantum dot film layer 4;

[0066] The electric response portion 30 is located between the first electrode 20 and the quantum dot light-emitting portion 40, and has a conjugated polymer or a reaction product of a conjugated polymer. The electric response portion 30 is configured to have different surface contact properties by adjusting the voltage of the first electrode 20 when forming the quantum dot light-emitting portion 40, wherein the surface contact properties are hydrophilic or hydrophobic; for example, the first sub-pixel X1 has a first sub-electrical response portion 31, the second sub-pixel X2 has a second sub-electrical response portion 32, and the third sub-pixel X3 has a third sub-electrical response portion 33; the quantum dot electric response portions 30 of different sub-pixels X constitute the electric response film layer 3;

[0067] The second electrode 5 is located on the side of the quantum dot light emitting portion 40 that is away from the electrical response portion 30. The second electrode 5 can be a whole layer.

[0068] In the embodiment of the present disclosure, an electric response portion is formed between the first electrode and the quantum dot light-emitting portion, and the electric response portion contains a conjugated polymer or a reaction product of a conjugated polymer. When forming a patterned quantum dot light-emitting portion, the conjugated polymer in the electric response portion can be controlled to undergo, for example, an oxidation reaction, or the product after the oxidation reaction can be controlled to undergo a reduction reaction, so that after different reactions occur, the electric response portion can be converted between hydrophilicity and hydrophobicity. By energizing the first electrodes of different sub-pixels, the surface contact properties of the electric response portions in different sub-pixels can be different, and quantum dots with ligands of different surface contact properties can be designed respectively, thereby realizing the patterning of quantum dot light-emitting portions with different light-emitting colors.

[0069] It should be noted that conjugated polymers (e.g., π-conjugated polymers) are very typical electroresponsive polymers, including polythiophene, polypyrrole, etc.; when different potentials are applied to the conjugated polymer film, the polymer film will undergo oxidation and reduction reactions, presenting different contact angles, switching between superhydrophilic and superhydrophobic, resulting in a change in the wettability of the film, such as Figure 2 shown.

[0070] In a specific implementation, the electrical response portion 30 of some sub-pixels X contains a conjugated polymer, and the electrical response portion 30 of some sub-pixels X contains an oxidation product of the conjugated polymer. Specifically, for example, the second sub-pixel X2 and the third sub-pixel X3 contain a conjugated polymer, and the first sub-pixel X1 contains an oxidation product of the conjugated polymer.

[0071] Specifically, the conjugated polymer is one of the following:

[0072] Among them, n1>1;

[0073] Among them, n2>1.

[0074] Specifically, the oxidation product is one of the following:

[0075] Among them, n3>1;

[0076] Among them, n4>1;

[0077] Among them, n5>1;

[0078] Among them, n6>1.

[0079] In a specific implementation, the electrical response portion 30 has a porous structure. In a specific implementation, the electrical response portion 30 can be formed by electrodeposition, thereby making the electrical response portion 30 a porous structure. In the disclosed embodiment, the electrical response portion 30 has a porous structure, which can increase the specific surface area of ​​the electrical response portion 30, improve the contact area with other substances, and enhance the hydrophilicity or hydrophobicity effect.

[0080] In a specific implementation, the quantum dot light-emitting portions of all sub-pixels have the same surface contact performance. In a specific implementation, the surface contact performance of all sub-pixels X can be made the same by ligand exchange. Specifically, the surface contact performance of all sub-pixels X can be made hydrophilic, or the surface contact performance of all sub-pixels X can be made hydrophobic. In the disclosed embodiment, the quantum dot light-emitting portions of all sub-pixels have the same surface contact performance, which is conducive to the formation of a uniform subsequent film layer, avoiding the situation where the surface of the quantum dot light-emitting portion 40 of some sub-pixels X is hydrophilic, while the surface of the quantum dot light-emitting portion 40 of some sub-pixels X is hydrophobic, resulting in different contact performance with the subsequent film layer in different areas when the subsequent film layer is formed, resulting in poor uniformity of the formed subsequent film layer.

[0081] Specifically, the quantum dot ends of the quantum dot light emitting unit 40 are connected to one or a combination of the following:

[0082] hydroxyl group;

[0083] carboxyl.

[0084] In the embodiment of the present disclosure, the quantum dot terminals of the quantum dot light-emitting portion 40 are connected to hydroxyl groups and / or carboxyl groups, so that the quantum dot light-emitting portions 40 of all sub-pixels X are hydrophilic.

[0085] Specifically, the quantum dot ends of the quantum dot light-emitting portion are connected to one or a combination of the following:

[0086] alkyl;

[0087] Aromatic hydrocarbon group.

[0088] In the embodiment of the present disclosure, the quantum dot terminals of the quantum dot light-emitting portion 40 are connected to alkyl groups and / or aromatic hydrocarbon groups, so that the quantum dot light-emitting portions 40 of all sub-pixels X are hydrophobic.

[0089] In specific implementation, combined with Figure 1 As shown, the quantum dot light emitting portion 40 is in direct contact with the electrical response portion 30 .

[0090] In the specific implementation, see Figure 3As shown, a front film layer 7 is further provided between the first electrode 20 and the electrical response portion 30. Specifically, the front film layer 7 is an electron transport layer; or, the front film layer 7 includes a stacked hole injection layer and a hole transport layer, and the hole transport layer is located on the side of the hole injection layer away from the first electrode 20.

[0091] Specifically, the quantum dot light emitting device provided in the embodiment of the present disclosure may be an inverted quantum dot light emitting device, such as Figure 4 As shown, the first electrode layer 2 is the cathode layer, the second electrode layer 5 is the anode layer, and one side of the base substrate 1 is provided with a cathode layer (first electrode layer 2), an electron transport layer (front film layer 7), an electric response film layer 3, a quantum dot film layer 4, a hole transport layer, a hole injection layer (the hole transport layer and the hole injection layer functional layer can serve as the functional layer 8), and an anode (second electrode layer 5) in sequence.

[0092] Specifically, the quantum dot light emitting device provided in the embodiment of the present disclosure may be a vertical quantum dot light emitting device, such as Figure 5 As shown, the first electrode layer 2 is the anode layer, the second electrode layer 5 is the cathode layer, and one side of the base substrate 1 is provided with an anode layer (first electrode layer 2), a hole transport layer, a hole injection layer (the hole transport layer and the hole injection layer functional layer can be used as the front film layer 7), an electric response film layer 3, a quantum dot film layer 4, an electron transport layer (the electron transport layer can be used as the functional layer 8), and a cathode (second electrode layer 5) in sequence.

[0093] Based on the same inventive concept, the embodiments of the present disclosure also provide a display device, which includes a quantum dot light-emitting device as provided in the embodiments of the present disclosure. The display device can be: a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, a smart watch, a fitness wristband, a personal digital assistant, or any other product or component with a display function. Other essential components of the display device should be understood by those of ordinary skill in the art and will not be described in detail here, nor should they be used as limitations on the present invention. In addition, since the principle of solving the problem by the display device is similar to the principle of solving the problem by the above-mentioned display panel, the implementation of the display device can refer to the embodiment of the above-mentioned quantum dot light-emitting device, and the repeated parts will not be described in detail.

[0094] Based on the same inventive concept, see Figure 6 As shown, the embodiment of the present disclosure also provides a method for manufacturing a quantum dot light-emitting device, which includes:

[0095] Step S100: forming a first electrode of each sub-pixel on one side of the base substrate;

[0096] Step S200: forming an electro-responsive portion containing a conjugated polymer in each sub-pixel in an initial state; wherein the initial state can be understood as a state before a voltage is applied to the first electrode to change the surface contact properties of the conjugated polymer. Specifically, the conjugated polymer layer can be formed by electrodeposition, and the conjugated polymer layer formed by electrodeposition can make the electro-responsive portion have a porous structure;

[0097] Step S300, sequentially forming quantum dot light-emitting portions of sub-pixels of different light-emitting colors, wherein the sub-pixel in which the quantum dot light-emitting portion is currently to be formed is used as the target sub-pixel, and quantum dot light-emitting portions of sub-pixels of different light-emitting colors are sequentially formed, including: step S310, forming the quantum dot light-emitting portion of the target sub-pixel;

[0098] Wherein, step S310, forming a quantum dot light-emitting portion of a target sub-pixel, includes:

[0099] Step S311, adjusting the surface contact properties of the electrical response portion and / or the quantum dot light-emitting portion so that the surface contact properties of the exposed surface of the target sub-pixel are different from the surface contact properties of the exposed surfaces of the remaining sub-pixels; wherein the surface contact properties are hydrophilicity or hydrophobicity;

[0100] Step S312: forming a quantum dot light-emitting portion having a surface contact performance identical to that of the exposed surface of the target sub-pixel.

[0101] In a specific implementation, the target sub-pixel is the first sub-pixel to be formed with a quantum dot light-emitting portion for the first time, for example, a red sub-pixel. In step S311, the surface contact properties of the electrical response portion and / or the quantum dot light-emitting portion are adjusted so that the surface contact properties of the exposed surface of the target sub-pixel are different from the surface contact properties of the exposed surfaces of the remaining sub-pixels. The surface contact properties are hydrophilicity or hydrophobicity, including:

[0102] In a solution state containing a reactant, a first voltage is applied to the first electrode of the first sub-pixel to cause an oxidation reaction of the conjugated polymer in the first sub-pixel.

[0103] In a specific implementation, the target sub-pixel is the second sub-pixel to be formed with a quantum dot light-emitting portion for the second time, for example, a green sub-pixel. In step S311, the surface contact properties of the electrical response portion and / or the quantum dot light-emitting portion are adjusted so that the surface contact properties of the exposed surface of the target sub-pixel are different from the surface contact properties of the exposed surfaces of the remaining sub-pixels. The surface contact properties are hydrophilicity or hydrophobicity, including:

[0104] In a solution state containing a reactant, a second voltage is applied to sub-pixels other than the first sub-pixel and the second sub-pixel to cause an oxidation reaction of the conjugated polymer in the sub-pixels other than the first sub-pixel and the second sub-pixel.

[0105] In a specific implementation, when the target sub-pixel is the third sub-pixel in which a quantum dot light-emitting portion is to be formed for the third time, for example, a blue sub-pixel, step S311 adjusts the surface contact properties of the electrical response portion and / or the quantum dot light-emitting portion so that the surface contact properties of the exposed surface of the target sub-pixel are different from the surface contact properties of the exposed surfaces of the remaining sub-pixels; wherein the surface contact properties are hydrophilicity or hydrophobicity, including:

[0106] In a solution state containing a reactant, applying a third voltage to the first electrode of the third sub-pixel to cause a reduction reaction of the reaction product of the conjugated polymer of the third sub-pixel;

[0107] Ligand exchange is performed to convert the surface contact performance of the second sub-pixel quantum dot film into the same surface contact performance as the first sub-pixel quantum dot film.

[0108] In a specific implementation, when the target sub-pixel is the third sub-pixel in which a quantum dot light-emitting portion is to be formed for the third time, for example, a blue sub-pixel, step S311 adjusts the surface contact properties of the electrical response portion and / or the quantum dot light-emitting portion so that the surface contact properties of the exposed surface of the target sub-pixel are different from the surface contact properties of the exposed surfaces of the remaining sub-pixels; wherein the surface contact properties are hydrophilicity or hydrophobicity, including:

[0109] Ligand exchange is performed to convert the surface contact performance of the first sub-pixel quantum dot film into the same surface contact performance as the second sub-pixel quantum dot film.

[0110] In a specific implementation, after forming the quantum dot light-emitting portion having the same surface contact performance as the surface contact performance of the exposed surface of the target sub-pixel, the manufacturing method further includes:

[0111] Step S313: converting all sub-pixel quantum dot light-emitting parts to have the same surface contact performance through ligand exchange.

[0112] In order to more clearly understand the method for manufacturing the quantum dot light-emitting device provided by the embodiment of the present disclosure, the following is further explained:

[0113] In one possible embodiment, combining Figure 7 、 Figure 8 、 Figure 9 、 Figure 11 As shown, the method for manufacturing a quantum dot light-emitting device includes:

[0114] Step 1: Form the first electrode (e.g., cathode) of each sub-pixel and the front film layer 7 (e.g., electron transport layer) on one side of the base substrate 1. The base substrate 1 may be a flexible base substrate, such as a plastic substrate having excellent heat resistance and durability, such as polyvinyl ether phthalate, polyarylate, polyimide (PI), polyethylene terephthalate (PET), polycarbonate (PC), cycloolefin polymer (COP), cellulose acetate propionate (CAP), polyethersulfone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polyallyl ester, or cellulose triacetate (TAC); or a rigid base substrate, such as a glass substrate, which is not limited here.

[0115] Step 2: Form an electrical response portion with the same surface contact performance for each sub-pixel, wherein the electrical response portion comprises a conjugated polymer; specifically, for example, 3-methylpolythiophene (as a conjugated polymer) can be electrodeposited in an acetonitrile solution with a deposition amount of 30 mC cm-2. Specifically, for example, each sub-pixel can be formed to have a hydrophobic electrical response portion, such as Figure 7 As shown in the upper middle figure.

[0116] Step 3: If the target sub-pixel is a red sub-pixel to be formed into a quantum dot light-emitting portion for the first time, a first voltage (e.g., -0.4 V) is applied to the first electrode (e.g., cathode) of the red sub-pixel in a solution containing reactants. Figure 7 Specifically, the substrate having the electrical response portion formed thereon may be placed in a dimethylformamide (DMF) solution containing tetrabutylammonium hexafluorophosphate (as a reactant), and a potential of -0.4 V may be applied to the cathode of the red sub-pixel where the red quantum dots are to be deposited, so that the oxidation reaction of the conjugated polymer in the red sub-pixel may be as follows:

[0117]

[0118] Then the electrical response portion of the red sub-pixel is converted to hydrophilic. After application, the substrate is taken out, blown dry, and annealed at 150 degrees for 10 minutes.

[0119] Step 4: forming a red quantum dot film having the same surface contact performance as the surface contact performance of the electric response portion in the red sub-pixel, that is, forming a hydrophilic red quantum dot light-emitting portion, such as Figure 7 Specifically, hydrophilic red quantum dots (10 mg / ml) may be spin-coated, and after the spin coating is completed, the substrate is rinsed with n-hexanol to remove quantum dots that have weak adhesion to other pixels, thereby forming a patterned red quantum dot film layer.

[0120] Step 5: The target sub-pixel is the green sub-pixel of the second quantum dot light-emitting portion to be formed. Specifically, in the solution containing the reactant, the sub-pixels other than the red sub-pixel and the green sub-pixel (i.e., the blue sub-pixel, Figure 7-11 In each light-emitting device, the sub-pixels are distributed from left to right as follows: red sub-pixel, green sub-pixel, blue sub-pixel) and a second voltage is applied to cause an oxidation reaction of the conjugated polymer in the sub-pixels other than the red sub-pixels and the green sub-pixels (i.e., the blue sub-pixels), so that the electrical response portion of the area where the blue sub-pixels are located is converted to hydrophilic. Since the red quantum dot light-emitting portion with hydrophilicity has been formed in the red sub-pixels in step 4, only the electrical response portion of the area where the green sub-pixels are located is hydrophobic. Figure 8 Specifically, the substrate with the red quantum dot light-emitting portion formed thereon may be placed in a DMF solution containing tetrabutylammonium hexafluorophosphate (as a reactant), and a potential of -0.4 V may be applied to the cathode of the blue sub-pixel. The oxidation reaction of the conjugated polymer in the blue sub-pixel may be as follows:

[0121]

[0122] Then the electrical response part of the blue sub-pixel is converted into hydrophilicity. After application, the substrate can be taken out, blown dry and annealed at 150 degrees for 10 minutes.

[0123] Step 6: forming a green quantum dot film having the same surface contact performance as the surface contact performance of the electric response portion in the green sub-pixel, that is, forming a hydrophobic green quantum dot light-emitting portion, such as Figure 8 Specifically, hydrophobic green quantum dots may be spin-coated, and after the spin coating is completed, the substrate is rinsed with n-hexanol to wash away quantum dots that have weak adhesion to other pixels, thereby forming a patterned green quantum dot film layer.

[0124] Step 7: The target sub-pixel is the blue sub-pixel in which the quantum dot light-emitting portion is to be formed for the third time. In the solution containing the reactants, a third voltage is applied to the cathode of the blue sub-pixel to cause the oxidation product of the conjugated polymer in the blue sub-pixel to undergo a reduction reaction after the oxidation reaction, thereby converting the electrical response portion of the blue sub-pixel into a hydrophobic state again, such as Figure 9 Specifically, a potential of 0.6 V may be applied to the cathode of the blue sub-pixel, and the reduction reaction of the blue sub-pixel may be as follows:

[0125]

[0126] Then the electrical response portion of the blue sub-pixel is converted to hydrophobic. After application, the substrate is taken out, blown dry, and annealed at 150 degrees for 10 minutes.

[0127] Step 8: Perform ligand exchange to convert the surface contact performance of the green sub-pixel quantum dot light-emitting portion into the same surface contact performance as the red sub-pixel quantum dot film, so that only the electrical response portion of the blue sub-pixel is hydrophobic. Figure 9 As shown in the middle figure.

[0128] Step 9: forming a blue quantum dot film having the same surface contact performance as the surface contact performance of the electric response portion in the blue sub-pixel, that is, forming a hydrophobic blue quantum dot light-emitting portion, such as Figure 9 Specifically, hydrophobic blue quantum dots may be spin-coated, and after the spin coating is completed, the substrate is rinsed with n-hexanol to remove the quantum dots that have weak adhesion to other pixels, thereby forming a patterned blue quantum dot film layer.

[0129] Step 10: By ligand exchange, the blue quantum dot light-emitting portion of the blue sub-pixel is converted into a hydrophilic surface, and then the quantum dot light-emitting portions of all sub-pixels are finally converted into having the same surface contact properties, such as Figure 11 shown.

[0130] In another possible embodiment, combining Figure 7 、 Figure 8 、 Figure 10 、 Figure 11 As shown, the method for manufacturing a quantum dot light-emitting device includes:

[0131] Step 1: Form the first electrode (e.g., cathode) of each sub-pixel and the front film layer 7 (e.g., electron transport layer) on one side of the base substrate 1. The base substrate 1 may be a flexible base substrate, such as a plastic substrate having excellent heat resistance and durability, such as polyvinyl ether phthalate, polyarylate, polyimide (PI), polyethylene terephthalate (PET), polycarbonate (PC), cycloolefin polymer (COP), cellulose acetate propionate (CAP), polyethersulfone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polyallyl ester, or cellulose triacetate (TAC); or a rigid base substrate, such as a glass substrate, which is not limited here.

[0132] Step 2: Form an electrical response portion with the same surface contact performance for each sub-pixel, wherein the electrical response portion comprises a conjugated polymer; specifically, for example, 3-methylpolythiophene (as a conjugated polymer) can be electrodeposited in an acetonitrile solution with a deposition amount of 30 mC cm-2. Specifically, for example, each sub-pixel can be formed to have a hydrophobic electrical response portion, such as Figure 7 As shown in the upper middle figure.

[0133] Step 3: If the target sub-pixel is a red sub-pixel to be formed into a quantum dot light-emitting portion for the first time, a first voltage (e.g., -0.4 V) is applied to the first electrode (e.g., cathode) of the red sub-pixel in a solution containing reactants. Figure 7 Specifically, the substrate may be placed in a dimethylformamide (DMF) solution containing tetrabutylammonium hexafluorophosphate (as a reactant), and a potential of -0.4 V may be applied to the cathode of the red sub-pixel where the red quantum dots are to be deposited. The oxidation reaction of the conjugated polymer in the red sub-pixel may be as follows:

[0134]

[0135] Then the electrical response portion of the red sub-pixel is converted to hydrophilic. After application, the substrate is taken out, blown dry, and annealed at 150 degrees for 10 minutes.

[0136] Step 4: forming a red quantum dot film having the same surface contact performance as the surface contact performance of the electric response portion in the red sub-pixel, that is, forming a hydrophilic red quantum dot light-emitting portion, such as Figure 7 As shown in the lower figure.

[0137] Step 5: The target sub-pixel is the green sub-pixel where the quantum dot light-emitting portion is to be formed for the second time. Specifically, in a solution containing a reactant, a second voltage is applied to the sub-pixels other than the red sub-pixels and the green sub-pixels (i.e., the blue sub-pixels) to cause an oxidation reaction of the conjugated polymer in the sub-pixels other than the red sub-pixels and the green sub-pixels (i.e., the blue sub-pixels), so that the electrical response portion of the area where the blue sub-pixel is located is converted to hydrophilic. Since a red quantum dot light-emitting portion with hydrophilicity has been formed in the red sub-pixel in step 4, ultimately only the electrical response portion of the area where the green sub-pixel is located is hydrophobic. Figure 8 Specifically, the substrate may be placed in a DMF solution containing tetrabutylammonium hexafluorophosphate (as a reactant), and a potential of -0.4 V may be applied to the cathode of the blue sub-pixel. The oxidation reaction of the conjugated polymer in the blue sub-pixel may be as follows:

[0138]

[0139] Then the electrical response part of the blue sub-pixel is converted into hydrophilicity. After application, the substrate can be taken out, blown dry and annealed at 150 degrees for 10 minutes.

[0140] Step 6: forming a green quantum dot film having the same surface contact performance as the surface contact performance of the electric response portion in the green sub-pixel, that is, forming a hydrophobic green quantum dot light-emitting portion, such as Figure 8 As shown in the lower figure.

[0141] Step 7: The target sub-pixel is the blue sub-pixel whose quantum dot light-emitting portion is to be formed for the third time. Then, ligand exchange is performed to convert the surface contact performance of the red sub-pixel quantum dot film into the same surface contact performance as the green sub-pixel quantum dot film, that is, the red quantum dot light-emitting portion and the green quantum dot light-emitting portion are both hydrophobic, leaving only the electric response portion of the blue sub-pixel as hydrophilic, such as Figure 10 As shown in the upper side figure.

[0142] Step 8: forming a blue quantum dot film having the same surface contact performance as the surface contact performance of the electric response portion in the blue sub-pixel, that is, forming a hydrophilic blue quantum dot light-emitting portion, such as Figure 10 As shown in the lower figure.

[0143] Step 9: By ligand exchange, the blue quantum dot light-emitting portion of the blue sub-pixel is converted into a hydrophilic surface, and then the quantum dot light-emitting portions of all sub-pixels are finally converted into having the same surface contact properties, such as Figure 11 shown.

[0144] The main difference between this embodiment and the previous embodiment lies in step seven. That is, in this embodiment, the surface contact performance of the blue sub-pixel can be made different from that of the other two sub-pixels simply by ligand exchange, and the steps are simpler.

[0145] In the embodiment of the present disclosure, an electric response portion is formed between the first electrode and the quantum dot light-emitting portion, and the electric response portion contains a conjugated polymer or a reaction product of a conjugated polymer. When forming a patterned quantum dot light-emitting portion, the conjugated polymer in the electric response portion can be controlled to undergo an oxidation reaction, or the product after the oxidation reaction can be controlled to undergo a reduction reaction, so that after different reactions occur, the electric response portion can be converted between hydrophilicity and hydrophobicity. By energizing the first electrodes of different sub-pixels, the surface contact properties of the electric response portions in different sub-pixels can be different, and quantum dots with ligands with different surface contact properties can be designed respectively, thereby realizing the patterning of quantum dot light-emitting portions with different light-emitting colors.

[0146] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0147] Obviously, those skilled in the art may make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if such changes and modifications of the embodiments of the present invention fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A quantum dot light-emitting device comprising a substrate and a plurality of sub-pixels with different light-emitting colors located on one side of the substrate, wherein: The sub-pixel includes: a first electrode; a quantum dot light-emitting portion, the quantum dot light-emitting portion being located on a side of the first electrode away from the base substrate; an electric response portion, the electric response portion being located between the first electrode and the quantum dot light-emitting portion and comprising a conjugated polymer or a reaction product of the conjugated polymer, wherein the electric response portion is configured to have different surface contact properties by adjusting the voltage of the first electrode when forming the quantum dot light-emitting portion, wherein the surface contact properties are hydrophilic or hydrophobic; a second electrode, the second electrode being located on a side of the quantum dot light-emitting portion away from the electrical response portion; The electrical response portion of some of the sub-pixels contains the conjugated polymer, and the electrical response portion of some of the sub-pixels contains an oxidation product of the conjugated polymer after an oxidation reaction; wherein the oxidation product is obtained by applying an electric potential to the conjugated polymer; Wherein, the conjugated polymer is one of the following: Among them, n1>1; Among them, n2>

1.

2. The quantum dot light-emitting device according to claim 1, wherein The oxidation product is one of the following: Among them, n3>1; Among them, n4>1; Among them, n5>1; Among them, n6>

1.

3. The quantum dot light-emitting device according to claim 1, wherein: The electric response portion is a porous structure.

4. The quantum dot light-emitting device according to claim 1, wherein The quantum dot light-emitting parts of all the sub-pixels have the same surface contact performance.

5. The quantum dot light emitting device according to claim 4, wherein: The quantum dot ends of the quantum dot light-emitting portion are connected to one or a combination of the following: hydroxyl group; carboxyl.

6. The quantum dot light-emitting device according to claim 4, wherein: The quantum dot ends of the quantum dot light-emitting portion are connected to one or a combination of the following: alkyl; Aromatic hydrocarbon group.

7. The quantum dot light-emitting device according to claim 1, wherein: The quantum dot light emitting portion is in direct contact with the electrical response portion.

8. The quantum dot light-emitting device according to claim 1, wherein: A front film layer is further provided between the first electrode and the electrical response portion.

9. The quantum dot light emitting device according to claim 8, wherein: The front film layer is an electron transport layer; or, the front film layer includes a hole injection layer and a hole transport layer stacked together, and the hole transport layer is located on a side of the hole injection layer away from the first electrode.

10. A display device, wherein: The device comprises a quantum dot light-emitting device as described in any one of claims 1 to 9.

11. A method for manufacturing a quantum dot light-emitting device, wherein: include: forming a first electrode of each sub-pixel on one side of the base substrate; forming an electric response portion containing a conjugated polymer in the initial state of each sub-pixel; Sequentially forming quantum dot light-emitting portions of the sub-pixels of different light-emitting colors, wherein the sub-pixel to be currently formed with the quantum dot light-emitting portion is used as a target sub-pixel, and sequentially forming quantum dot light-emitting portions of the sub-pixels of different light-emitting colors includes: forming the quantum dot light-emitting portion of the target sub-pixel; Wherein, the quantum dot light-emitting portion forming the target sub-pixel includes: Adjusting the surface contact properties of the electrical response portion and / or the quantum dot light-emitting portion so that the surface contact properties of the exposed surface of the target sub-pixel are different from the surface contact properties of the exposed surfaces of the remaining sub-pixels; wherein the surface contact properties are hydrophilic or hydrophobic; forming a quantum dot light-emitting portion having a surface contact property identical to that of the exposed surface of the target sub-pixel; The target sub-pixel is a first sub-pixel in which the quantum dot light-emitting portion is to be formed for the first time, and adjusting the surface contact properties of the electrical response portion and / or the quantum dot light-emitting portion so that the surface contact properties of the exposed surface of the target sub-pixel are different from the surface contact properties of the exposed surfaces of the remaining sub-pixels includes: In a solution state containing a reactant, applying a first voltage to the first electrode of the first sub-pixel to cause an oxidation reaction of the conjugated polymer in the first sub-pixel; The target sub-pixel is a second sub-pixel of the quantum dot light-emitting portion to be formed for a second time, and adjusting the surface contact properties of the electrical response portion and / or the quantum dot light-emitting portion so that the surface contact properties of the exposed surface of the target sub-pixel are different from the surface contact properties of the exposed surfaces of the remaining sub-pixels includes: In a solution state containing a reactant, a second voltage is applied to the sub-pixels other than the first sub-pixel and the second sub-pixel to cause an oxidation reaction of the conjugated polymer in the sub-pixels other than the first sub-pixel and the second sub-pixel.

12. The production method according to claim 11, wherein: The target sub-pixel is a third sub-pixel of the quantum dot light-emitting portion to be formed for a third time, and adjusting the surface contact properties of the electrical response portion and / or the quantum dot light-emitting portion so that the surface contact properties of the exposed surface of the target sub-pixel are different from the surface contact properties of the exposed surfaces of the remaining sub-pixels includes: applying a third voltage to the first electrode of the third sub-pixel in a solution state containing a reactant, so as to cause a reduction reaction of the reaction product of the conjugated polymer in the third sub-pixel; Ligand exchange is performed to convert the surface contact performance of the quantum dot film of the second sub-pixel into the same surface contact performance as that of the quantum dot film of the first sub-pixel.

13. The production method according to claim 11, wherein: The target sub-pixel is a third sub-pixel of the quantum dot light-emitting portion to be formed for a third time, and adjusting the surface contact properties of the electrical response portion and / or the quantum dot light-emitting portion so that the surface contact properties of the exposed surface of the target sub-pixel are different from the surface contact properties of the exposed surfaces of the remaining sub-pixels includes: Ligand exchange is performed to convert the surface contact performance of the quantum dot film of the first sub-pixel into the same surface contact performance as that of the quantum dot film of the second sub-pixel.

14. The production method according to claim 12 or 13, wherein: After forming the quantum dot light-emitting portion having the same surface contact performance as the surface contact performance of the exposed surface of the target sub-pixel, the manufacturing method further includes: By ligand exchange, the quantum dot light-emitting parts of all the sub-pixels are converted to have the same surface contact performance.

15. The production method according to claim 11, wherein: The step of forming the electric response portion containing the conjugated polymer in the initial state of each sub-pixel comprises: By means of electro-deposition, an electric response portion containing a conjugated polymer in the initial state of each sub-pixel is formed.

Images