Quantum dot material, quantum dot patterning method, light-emitting device and display device

Abstract

The invention discloses a quantum dot material, a quantum dot patterning method, a light-emitting device and a display device. The quantum dot material comprises a quantum dot body and at least one photosensitive group connected with the quantum dot body, wherein the photosensitive group is a spiropyrane group, and the spiropyrane group is subjected to a ring-opening reaction or a ring-closing reaction under different preset conditions. According to the application, the photosensitive group is modified on the quantum dot body, and the photosensitive group is the spiropyrane group, so that the solubility of the quantum dot material in the corresponding region can be changed by changing the polarity of the quantum dot material in the corresponding region by utilizing the characteristic that the spiropyrane group is subjected to ring-opening reaction or ring-closing reaction under different preset conditions; therefore, the anti-developing performance of the reserved area is improved, and the patterning of the quantum dot film layer is realized. Furthermore, the anti-developing performance of the reserved area is improved, so that the probability that the quantum dot film in the reserved area is damaged by the developing solution can be reduced, and the resolution ratio and the display effect of the display device are further improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to quantum dot materials, quantum dot patterning methods, light-emitting devices and display apparatuses. Background Art

[0002] Semiconductor quantum dots (Quantum Dot, QD) is an important fluorescent nanomaterial. Using quantum dot materials as light-emitting layer materials and applying them in the field of optoelectronic displays is gradually becoming a future development trend.

[0003] In the prior art, the patterning process of quantum dots is usually achieved by inkjet printing. However, the prior art cannot produce quantum dots with high resolution and good performance. Summary of the invention

[0004] In order to solve the above problems or other problems, the present application provides the following technical solutions.

[0005] The first technical solution adopted in the present application is to provide a quantum dot material, including: a quantum dot body; and at least one photosensitive group, which is connected to the quantum dot body; wherein the photosensitive group is a spiropyran group, which undergoes a ring-opening reaction or a ring-closing reaction under different preset conditions.

[0006] The preset conditions include ultraviolet light irradiation and visible light irradiation, wherein: the spiropyran group undergoes a ring-opening reaction under ultraviolet light irradiation, and the spiropyran group undergoes a ring-closing reaction under visible light irradiation.

[0007] The spiropyran group includes: an oxygen heteroatom; and a benzene ring connected to the oxygen heteroatom; wherein the benzene ring is modified with at least one electron-donating group; wherein the electron-donating group is modified at the ortho position and / or para position of the oxygen heteroatom.

[0008] Wherein, the spiropyran group includes compounds represented by Formula 1:

[0009]

[0010] Among them, hv1 is ultraviolet light irradiation, hv2 is visible light irradiation, the left side of the equation is a spiropyran group in a closed ring form, and the right side of the equation is a spiropyran group formed by an open ring; preferably, the benzene ring connected to the oxygen heteroatom in the spiropyran group is modified with at least one electron-donating group.

[0011] Among them, the quantum dot material also includes: other ligand groups, connected to the quantum dot body; wherein the number of spiropyran groups is a first value, the sum of the number of spiropyran groups and other ligand groups is a second value, and the ratio of the first value to the second value is any value between 20% and 60%.

[0012] In order to solve the above technical problems, the second technical solution adopted in the present application is to provide a quantum dot patterning method, including: obtaining quantum dot material; wherein the quantum dot material includes a quantum dot body and at least one photosensitive group connected to the quantum dot body; wherein the photosensitive group is a spiropyran group, and the spiropyran group undergoes an opening reaction or a closing reaction under different preset conditions; obtaining a quantum dot solution based on the quantum dot material; depositing the quantum dot solution on a substrate to form a quantum dot film; exposing the quantum dot film to undergo an opening reaction or a closing reaction; and developing the quantum dot film to form a preset pattern on the quantum dot film layer.

[0013] Among them, the preset conditions include ultraviolet light irradiation and visible light irradiation, and the step of exposing the quantum dot film to produce a ring-opening reaction or a ring-closing reaction includes: in response to the spiropyran group being in a closed-ring form, exposing the quantum dot film by ultraviolet light irradiation to produce a ring-opening reaction; or, in response to the spiropyran group being in an open-ring form, exposing the quantum dot film by visible light irradiation to produce a closed-ring reaction.

[0014] Among them, after the step of developing the quantum dot film to form a preset pattern on the quantum dot film layer, it includes: after the step of developing the quantum dot film to form a preset pattern on the quantum dot film layer, it includes: in response to the spiropyran group being in an open-ring form after patterning, irradiating the quantum dot film with visible light to cause a closed-ring reaction; or, in response to the spiropyran group being in a closed-ring form after patterning, irradiating the quantum dot film with ultraviolet light to cause an open-ring reaction.

[0015] In order to solve the above technical problems, the third technical solution adopted in the present application is to provide a light-emitting device, which includes a substrate, an anode, a light-emitting layer and a cathode stacked in sequence on the substrate, the light-emitting layer includes a quantum dot film layer, and the quantum dot film layer is made by the above-mentioned quantum dot patterning method; wherein, the quantum dot material in the quantum dot film layer includes a quantum dot body and at least one photosensitive group connected to the quantum dot body; wherein, the photosensitive group is a spiropyran group, and the spiropyran group undergoes a ring-opening reaction or a ring-closing reaction under different preset conditions.

[0016] In order to solve the above technical problems, the fourth technical solution adopted in the present application is to provide a display device, including the above light-emitting device.

[0017] The beneficial effects of the present application are as follows: Different from the prior art, the present application provides quantum dot materials, quantum dot patterning methods, light-emitting devices and display devices, by modifying the photosensitive group on the quantum dot body, and the photosensitive group is a spiropyran group, it is possible to utilize the characteristics of the spiropyran group to undergo a ring-opening reaction or a ring-closing reaction under different preset conditions, by changing the polarity of the quantum dot material in the corresponding region to change the solubility of the quantum dot material in the corresponding region, so as to improve the anti-development performance of the reserved region, thereby realizing the patterning of the quantum dot film layer. Furthermore, since the anti-development performance of the reserved region is improved, the probability of the developer damaging the quantum dot film in the reserved region can be reduced, thereby improving the resolution and display effect of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the example description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a schematic structural diagram of the first embodiment of the quantum dot material of the present application;

[0020] Figure 2 It is a schematic diagram of the reaction of spiropyran group under different light irradiation;

[0021] Figure 3 It is a schematic structural diagram of the second embodiment of the quantum dot material of the present application;

[0022] Figure 4 It is a schematic structural diagram of the third embodiment of the quantum dot material of the present application;

[0023] Figure 5 This is a schematic structural diagram of a fourth embodiment of the quantum dot material of the present application;

[0024] Figure 6 It is a schematic diagram of the structure of the quantum dot entity and the alkyl chain connected to the ligand group of the present application;

[0025] Figure 7 It is a schematic diagram of a process of an implementation method of a quantum dot patterning method of the present application;

[0026] Figure 8 It is a schematic structural diagram of an embodiment of a light-emitting device of the present application. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0028] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "said", and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless otherwise clearly indicated above, and "multiple" generally includes at least two, but does not exclude the inclusion of at least one.

[0029] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0030] It should be understood that the terms "include", "comprises" or any other variations used herein are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "includes..." do not exclude the presence of other identical elements in the process, method, article or device that includes the elements.

[0031] In one embodiment, the patterning process of quantum dots is usually achieved by inkjet printing or photolithography. However, the morphology and thickness uniformity of the film formed by inkjet printing are poor, and it is only suitable for preparing devices with medium and low pixel density, and it is difficult to prepare high PPI (pixel density unit, that is, the number of pixels per inch) devices; photolithography is not limited by PPI, but when the photocrosslinking reaction occurs, the energy required for bond breaking is large, which may cause the structure of the quantum dots to be destroyed, thereby affecting the display effect.

[0032] Based on the above situation, the present application provides quantum dot materials, quantum dot patterning methods, light-emitting devices and display devices, which can solve the problem that high-resolution and good-performance quantum dot materials cannot be prepared in the above embodiments.

[0033] The quantum dot material provided in the present application includes: a quantum dot body; and at least one photosensitive group, which is connected to the quantum dot body; wherein the photosensitive group is a spiropyran group, and the spiropyran group undergoes a ring-opening reaction or a ring-closing reaction under different preset conditions. By modifying at least one photosensitive group on the quantum dot body, and the photosensitive group is a spiropyran group, the characteristics of the spiropyran group undergoing a ring-opening reaction or a ring-closing reaction under different preset conditions can be utilized, and the solubility of the quantum dot material in the corresponding region can be changed by changing the polarity of the quantum dot material in the corresponding region to improve the anti-development performance of the reserved region, thereby realizing the patterning of the quantum dot film layer. Furthermore, since the anti-development performance of the reserved region is improved, the probability of the developer damaging the quantum dot film in the reserved region can be reduced, thereby improving the resolution and display effect of the display device.

[0034] To illustrate the specific structure of the quantum dot material of this application, please refer to Figure 1 , Figure 1 It is a structural schematic diagram of an implementation method of the quantum dot material of the present application.

[0035] In this embodiment, the quantum dot material includes a quantum dot body (QD) and at least one photosensitive group connected to the quantum dot body, wherein the photosensitive group is a spiropyran group, and the spiropyran group undergoes a ring-opening reaction or a ring-closing reaction under different preset conditions.

[0036] The quantum dot body includes quantum dots of predetermined colors, namely red (R) quantum dots, green (G) quantum dots and blue (B) quantum dots.

[0037] Wherein, the quantum dot material also includes an alkyl chain, and the spiropyran group is connected to the quantum dot body through the alkyl chain. The present application does not limit the length of the alkyl chain.

[0038] Among them, the spiropyran group is a general term for a class of compounds composed of two aromatic heterocyclic rings (one of which contains a pyran ring) connected by an sp3 hybridized spiro carbon atom. Among them, the pyran ring refers to a six-membered heterocyclic compound containing an oxygen heteroatom, such as Figure 1 A six-membered heterocyclic compound with an oxygen atom connected to the benzene ring on the right side.

[0039] Among them, the preset conditions include ultraviolet light irradiation and visible light irradiation. The spiropyran group undergoes a ring-opening reaction under ultraviolet light irradiation, and the spiropyran group undergoes a ring-closing reaction under visible light irradiation.

[0040] Specifically, see Figure 2 , Figure 2 This is a schematic diagram of the reaction of spiropyran groups under different light conditions.

[0041] In this embodiment, when ultraviolet light (hv1) irradiates the closed-ring spiropyran group, a ring-opening reaction occurs, the CO bond (carbon-oxygen bond) between the spiro carbon atom and the oxygen heteroatom in the molecular structure of the spiropyran group is cleaved, and the ring structure is opened while the electrons are rearranged to form a large conjugated system, and its polarity is changed from hydrophilic (polar) in the closed-ring form to hydrophobic (non-polar) in the open-ring form. When visible light (hv2) irradiates the open-ring spiropyran group, a ring-closing reaction occurs, and the open-ring structure reforms the CO bond and can reversibly return to the original closed-ring form.

[0042] In a specific implementation scenario, the spiropyran group is in a closed-loop form. When the spiropyran group is irradiated with ultraviolet light, the spiropyran group in the irradiated area undergoes a ring-opening reaction to form an open-loop structure, and the solubility of the quantum dot material is changed (the polarity is converted to non-polar). After exposure, the quantum dot film is cleaned with a polar solvent that can dissolve the quantum dot material, then the polar quantum dot material in the unirradiated area is dissolved and removed, while the quantum dot material with changed polarity (non-polar) in the irradiated area is not dissolved in the polar solvent, thereby retaining the pattern of the quantum dot film layer.

[0043] In some specific embodiments, the polar solvent can be any one or more of ethyl acetate, dichloromethane, diethyl ether, and toluene.

[0044] In another specific implementation scenario, the spiropyran group is in an open-ring form. When the spiropyran group is irradiated with visible light, the spiropyran group in the irradiated area undergoes a ring-closing reaction to form a ring structure, and the solubility of the quantum dot material is changed (non-polarity becomes polarity). After exposure, the quantum dot film is cleaned with a non-polar solvent that can dissolve the quantum dot material. The non-polar quantum dot material in the unirradiated area is dissolved and removed, while the quantum dot material (polarity) with changed polarity in the irradiated area is insoluble in the non-polar solvent, thereby being retained to form a pattern of the quantum dot film layer.

[0045] In some specific embodiments, the non-polar solvent can be any one or more of cyclohexane, petroleum ether, hexane, and pentane.

[0046] It can be understood that by modifying at least one photosensitive group on the quantum dot body, and the photosensitive group is a spiropyran group, the property of the spiropyran group to undergo a ring-opening reaction or a ring-closing reaction under different preset conditions can be utilized, and the solubility of the quantum dot material in the corresponding area can be changed by changing the polarity of the quantum dot material in the corresponding area, so as to improve the anti-development performance of the retained area, thereby realizing the patterning of the quantum dot film layer.

[0047] Furthermore, in this embodiment, the benzene ring connected to the oxygen heteroatom in the spiropyran group is modified with at least one electron-donating group, wherein the electron-donating group is modified at the ortho position and / or para position of the oxygen heteroatom.

[0048] Among them, the electron-donating group can increase the electron cloud density of the CO bond between the spiro carbon atom and the oxygen heteroatom. The greater the electron cloud density on the CO bond, the greater the electrophilic reaction activity, the smaller the energy required for bond breaking, and the faster the reaction rate, thereby reducing the probability of damage to the quantum dot body and improving the full-color display effect.

[0049] Specifically, the electron-donating group on the benzene ring, as the ortho-para position of the oxygen heteroatom, can increase the electron cloud density of the oxygen heteroatom, thereby enabling the oxygen heteroatom to better provide electrons for the CO bond.

[0050] In this embodiment, the electron donating group can be modified only at the ortho position of the oxygen heteroatom, or only at the para position of the oxygen heteroatom, or at both the ortho and para positions of the oxygen heteroatom. The present application does not limit the specific substitution position and specific number of the electron donating group connected to the benzene ring.

[0051] In this embodiment, the electron donating group includes at least one of a strong electron donating group, a medium electron donating group and a weak electron donating group.

[0052] Among them, strong electron donating groups include dialkylamino (-NR2), alkylamino (-NHR), amino (-NH2), alkoxy (-OR), etc. Medium electron donating groups include amide (-NHCOR), acyloxy (-OCOR), etc. Weak electron donating groups include alkyl (-R), carboxymethyl (-CH2COOH), etc.

[0053] In this embodiment, the number and type of electron-donating groups modified on the multiple spiropyran groups may be the same or different, and this application does not limit this.

[0054] In a specific implementation scenario, only one electron-donating group is connected to the benzene ring connected to the oxygen heteroatom in the spiropyran group, and the electron-donating group is arranged at the ortho position of the oxygen heteroatom. In another specific implementation scenario, only one electron-donating group is connected to the benzene ring connected to the oxygen heteroatom in the spiropyran group, and the electron-donating group is arranged at the para position of the oxygen heteroatom. In another specific implementation scenario, two electron-donating groups are connected to the benzene ring connected to the oxygen heteroatom in the spiropyran group, and they are arranged at the ortho position and the para position of the oxygen heteroatom, respectively.

[0055] See also Figure 3 , Figure 4 and Figure 5 , Figure 3 is a schematic structural diagram of the second embodiment of the quantum dot material of the present application, Figure 4 is a schematic structural diagram of the third embodiment of the quantum dot material of the present application, Figure 5 It is a structural schematic diagram of the fourth embodiment of the quantum dot material of the present application.

[0056] like Figure 3 As shown in FIG. 1 , there is only one electron-donating group R connected to the benzene ring connected to the oxygen heteroatom at the para position. Figure 4 As shown in FIG. 1 , there is only one electron-donating group R connected to the benzene ring connected to the oxygen heteroatom at the ortho position. Figure 5 As shown, the benzene ring connected to the oxygen heteroatom is connected to two electron-donating groups, R1 and R2, and R1 is arranged at the para position of the oxygen heteroatom, and R2 is arranged at the ortho position of the oxygen heteroatom. R1 and R2 can be the same electron-donating group or different electron-donating groups.

[0057] In this embodiment, the quantum dot material further includes other ligand groups connected to the quantum dot body.

[0058] The number of spiropyran groups is a first value, the sum of the numbers of spiropyran groups and other ligand groups is a second value, and the ratio of the first value to the second value is any value between 20% and 60%.

[0059] In a preferred embodiment, the ratio of the first value to the second value is 30% to 40%.

[0060] Among them, the remaining ligand groups include sulfate ligands and quenching groups. Sulfate ligands are used to increase the solubility of quantum dot materials, and quenching groups are used to prevent color mixing caused by the residual quantum dot materials emitting light after cleaning, thereby effectively improving the color gamut of quantum dot display.

[0061] Specifically, see Figure 6 , Figure 6 Schematic diagram of the structure of the quantum dot body and the alkyl chain connected to the ligand group of the present application. In this embodiment, the quantum dot body is connected to multiple alkyl chains, and is connected to the ligand group through multiple alkyl chains.

[0062] It can be understood that the ratio of the first value to the second value is any value between 20% and 60%, which can not only ensure the solubility and quenching function of the quantum dot material, but also maximize the photolysis performance of the quantum dot material.

[0063] It can be understood that, by modifying at least one photosensitive group on the quantum dot body, and the photosensitive group is a spiropyran group, the spiropyran group can utilize the characteristics of ring-opening reaction or ring-closing reaction under different preset conditions, and by changing the polarity of the quantum dot material in the corresponding region to change the solubility of the quantum dot material in the corresponding region, so as to improve the anti-development performance of the reserved region, thereby realizing the patterning of the quantum dot film layer. Furthermore, since the anti-development performance of the reserved region is improved, the probability of the developer damaging the quantum dot film in the reserved region can be reduced, thereby improving the resolution and display effect of the display device.

[0064] Correspondingly, the present application provides a quantum dot patterning method.

[0065] Specifically, see Figure 7 , Figure 7 : is a schematic diagram of a process of an embodiment of a quantum dot patterning method of the present application. In this embodiment, the quantum dot patterning method includes:

[0066] S11: Obtain quantum dot material; wherein the quantum dot material includes a quantum dot body and at least one photosensitive group connected to the quantum dot body; wherein the photosensitive group is a spiropyran group, and the spiropyran group undergoes a ring-opening reaction or a ring-closing reaction under different preset conditions.

[0067] In this embodiment, the photosensitive group is connected to the quantum dot body via an alkyl chain, and the application does not limit the length of the alkyl chain.

[0068] The quantum dot body includes quantum dots of predetermined colors, namely, red (R) quantum dots, green (G) quantum dots and blue (B) quantum dots.

[0069] In some embodiments, the benzene ring connected to the oxygen heteroatom in the spiropyran group is modified with at least one electron-donating group, wherein the electron-donating group is modified at the ortho position and / or para position of the oxygen heteroatom.

[0070] The electron donating group includes at least one of a strong electron donating group, a medium electron donating group and a weak electron donating group.

[0071] In this embodiment, the number and type of electron-donating groups modified on the multiple spiropyran groups may be the same or different, and this application does not limit this.

[0072] In this embodiment, the preset conditions include ultraviolet light irradiation and visible light irradiation.

[0073] S12: Obtaining a quantum dot solution based on the quantum dot material.

[0074] In this embodiment, a quantum dot solution is prepared using quantum dot materials and a solvent.

[0075] In a specific implementation scenario, the spiropyran group is in a closed ring form, and the solvent can be a polar solvent such as ethyl acetate, dichloromethane, ether, toluene, etc.

[0076] In another specific implementation scenario, the spiropyran group is in an open-ring form, and the solvent can be a non-polar solvent such as cyclohexane, petroleum ether, hexane, pentane, etc.

[0077] S13: depositing a quantum dot solution on a substrate to form a quantum dot film.

[0078] S14: exposing the quantum dot film to light to cause a ring-opening reaction or a ring-closing reaction.

[0079] In this embodiment, after the quantum dot film is shielded by a mask, ultraviolet light or visible light is used to irradiate the corresponding area of ​​the quantum dot film, so that the spiropyran groups in the quantum dot material in the corresponding area undergo a ring-opening reaction or a ring-closing reaction.

[0080] In a specific implementation scenario, in response to the spiropyran group being in a closed-ring form, the quantum dot film is exposed to ultraviolet light to cause a ring-opening reaction.

[0081] In another specific implementation scenario, in response to the spiropyran group being in an open-ring form, the quantum dot film is exposed to visible light irradiation to cause a ring-closing reaction.

[0082] S15: Developing the quantum dot film to form a preset pattern on the quantum dot film layer.

[0083] In this embodiment, a solvent having the same polarity as the quantum dot solution is used to clean the quantum dot film to form clusters of quantum dot film layers.

[0084] In a specific implementation scenario, in response to ultraviolet light used during exposure, polar solvents such as ethyl acetate, dichloromethane, ether, and toluene are used as developers to clean the quantum dot film. The quantum dot material in the unirradiated area is dissolved and removed, while the quantum dot material in the irradiated area is insoluble in the developer due to the change in polarity, thereby retaining the pattern of the quantum dot film layer.

[0085] In another specific implementation scenario, in response to visible light used for exposure, non-polar solvents such as cyclohexane, petroleum ether, hexane, and pentane are used as developers to clean the quantum dot film. The quantum dot material in the unirradiated area is dissolved and removed, while the quantum dot material in the irradiated area is insoluble in the developer due to the change in polarity, thereby retaining the pattern of the quantum dot film layer.

[0086] It can be understood that by modifying at least one photosensitive group on the quantum dot body, and the photosensitive group is a spiropyran group, the property of the spiropyran group to undergo a ring-opening reaction or a ring-closing reaction under different preset conditions can be utilized, and the solubility of the quantum dot material in the corresponding area can be changed by changing the polarity of the quantum dot material in the corresponding area, so as to improve the anti-development performance of the retained area, thereby realizing the patterning of the quantum dot film layer.

[0087] Furthermore, in this embodiment, after patterning, the spiropyran group can be opened or closed according to the specific structure of the display device.

[0088] In this embodiment, in response to the spiropyran group being in an open ring form after patterning, the quantum dot film is irradiated with visible light to cause a ring-closing reaction. Alternatively, in response to the spiropyran group being in a closed ring form after patterning, the quantum dot film is irradiated with ultraviolet light to cause a ring-opening reaction.

[0089] Among them, the closed-ring spiropyran group is hydrophilic, while the hole transport layer (HTL) is hydrophobic, so the closed-ring spiropyran group has a stronger ability to block holes and can reduce hole transport. The open-ring spiropyran group is hydrophobic, so the open-ring spiropyran group has a weaker ability to block holes and is conducive to hole transport.

[0090] Specifically, if there are more holes in the display device, it is necessary to reduce hole transmission. At this time, a spiropyran group that is in a closed-loop form after patterning can be selected to reduce hole transmission through the spiropyran group to improve electron transmission, thereby making the carrier transmission of quantum dots more balanced, thereby reducing voltage and power consumption, and then improving the luminous efficiency and service life of the display device.

[0091] On the contrary, if there are more electrons in the display device, hole transport needs to be increased. In this case, a spiropyran group in an open-ring form after patterning can be selected to increase hole transport through the spiropyran group to make the carrier transmission of quantum dots more balanced, thereby reducing voltage and power consumption, and then improving the luminous efficiency and service life of the display device.

[0092] In a specific implementation scenario, in response to the spiropyran groups being in an open-ring form after patterning and more holes in the display device, the quantum dot film is irradiated with visible light to cause a closed-ring reaction, and the hole transmission is reduced by the generated closed-ring spiropyran groups to improve electron transmission.

[0093] In another specific implementation scenario, in response to the spiropyran group being in a closed-ring form after patterning and more electrons in the display device, the quantum dot film is irradiated with ultraviolet light to cause a ring-opening reaction, thereby increasing hole transport through the generated open-ring spiropyran group.

[0094] In yet another specific implementation scenario, in response to the spiropyran group being in an open-ring form after patterning and more electrons in the display device, no subsequent light treatment is performed.

[0095] In another specific implementation scenario, in response to the spiropyran group being in a closed-ring form after patterning and more holes in the display device, no subsequent light treatment is performed.

[0096] It can be understood that this embodiment, by modifying at least one photosensitive group on the quantum dot body, and the photosensitive group is a spiropyran group, can utilize the characteristics of the spiropyran group to undergo an open-loop reaction or a closed-loop reaction under different preset conditions, and by changing the polarity of the quantum dot material in the corresponding region to change the solubility of the quantum dot material in the corresponding region, so as to improve the anti-development performance of the reserved region, thereby realizing the patterning of the quantum dot film layer. Furthermore, since the anti-development performance of the reserved region is improved, the probability of the developer damaging the quantum dot film in the reserved region can be reduced, thereby improving the resolution and display effect of the display device. In addition, according to the specific structure of different display devices, the open-loop form or closed-loop form of the spiropyran group is changed after patterning, which can also make the transmission of the carriers of the quantum dots more balanced, thereby reducing the voltage and power consumption, and then improving the luminous efficiency and service life of the display device.

[0097] Correspondingly, the present application provides a light emitting device.

[0098] Specifically, see Figure 8 , Figure 8 It is a schematic structural diagram of an embodiment of a light-emitting device of the present application.

[0099] In this embodiment, the light-emitting device 100 includes a substrate 10, an anode 20, a light-emitting layer 30 and a cathode 40 stacked in sequence on the substrate 10. The light-emitting layer 30 includes a quantum dot film layer, and the quantum dot film layer is made by the above-mentioned quantum dot patterning method. The quantum dot material in the quantum dot film layer includes a quantum dot body and at least one photosensitive group connected to the quantum dot body; wherein the photosensitive group is a spiropyran group, and the spiropyran group undergoes a ring-opening reaction or a ring-closing reaction under different preset conditions.

[0100] In some embodiments, a hole transport layer is disposed between the anode 20 and the light-emitting layer 30 , and an electron transport layer is disposed between the cathode 40 and the light-emitting layer 30 .

[0101] Correspondingly, the present application provides a display device, comprising the above-mentioned light-emitting device.

[0102] It can be understood that the present application, by modifying at least one photosensitive group on the quantum dot body, and the photosensitive group is a spiropyran group, can utilize the characteristics of the spiropyran group to undergo an open-loop reaction or a closed-loop reaction under different preset conditions, and by changing the polarity of the quantum dot material in the corresponding region to change the solubility of the quantum dot material in the corresponding region, so as to improve the anti-development performance of the reserved region, thereby realizing the patterning of the quantum dot film layer. Furthermore, since the anti-development performance of the reserved region is improved, the probability of the developer damaging the quantum dot film in the reserved region can be reduced, thereby improving the resolution and display effect of the display device. In addition, according to the specific structure of different display devices, the open-loop form or closed-loop form of the spiropyran group is changed after patterning, which can also make the transmission of the carriers of the quantum dots more balanced, thereby reducing the voltage and power consumption, and then improving the luminous efficiency and service life of the display device.

[0103] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A quantum dot material, characterized in that: include: Quantum dot body; as well as, At least one photosensitive group, wherein the photosensitive group is connected to the quantum dot body; Wherein, the photosensitive group is a spiropyran group, and the spiropyran group undergoes a ring-opening reaction or a ring-closing reaction under different preset conditions.

2. The quantum dot material according to claim 1, characterized in that The preset conditions include ultraviolet light irradiation and visible light irradiation, wherein: The spiropyran group undergoes the ring-opening reaction under the irradiation of the ultraviolet light, and the spiropyran group undergoes the ring-closing reaction under the irradiation of the visible light.

3. The quantum dot material according to claim 1, characterized in that The spiropyran group includes: oxygen heteroatoms; and, a benzene ring connected to the oxygen heteroatom; Wherein, the benzene ring is modified with at least one electron-donating group; wherein, the electron-donating group is modified at the ortho position and / or para position of the oxygen heteroatom.

4. The quantum dot material according to claim 2, characterized in that: The spiropyran group includes compounds represented by Formula 1: Wherein, hv1 is the ultraviolet light irradiation, hv2 is the visible light irradiation, the left side of the equation is the spiropyran group in a closed ring form, and the right side of the equation is the spiropyran group formed by an open ring; Preferably, the benzene ring connected to the oxygen heteroatom in the spiropyran group is modified with at least one electron-donating group.

5. The quantum dot material according to claim 1, characterized in that: The quantum dot material also includes: Other ligand groups are connected to the quantum dot body; The number of the spiropyran groups is a first value, the sum of the number of the spiropyran groups and the number of the other ligand groups is a second value, and the ratio of the first value to the second value is any value between 20% and 60%.

6. A quantum dot patterning method, characterized in that: include: A quantum dot material is obtained; wherein the quantum dot material comprises a quantum dot body and at least one photosensitive group connected to the quantum dot body; wherein the photosensitive group is a spiropyran group, and the spiropyran group undergoes a ring-opening reaction or a ring-closing reaction under different preset conditions; Obtaining a quantum dot solution based on the quantum dot material; Depositing the quantum dot solution on a substrate to form a quantum dot film; Exposing the quantum dot film to light to cause the ring-opening reaction or the ring-closing reaction; The quantum dot film is developed to form a preset pattern on the quantum dot film layer.

7. The quantum dot patterning method according to claim 6, characterized in that: The preset conditions include ultraviolet light irradiation and visible light irradiation, and the step of exposing the quantum dot film to cause the ring-opening reaction or the ring-closing reaction includes: In response to the spiropyran group being in a closed ring form, exposing the quantum dot film to ultraviolet light to cause the ring-opening reaction; or, In response to the spiropyran group being in an open ring form, the quantum dot film is exposed to the visible light irradiation to cause the ring closing reaction.

8. The quantum dot patterning method according to claim 7, characterized in that: After the step of developing the quantum dot film to form a preset pattern on the quantum dot film layer, the method further comprises: In response to the spiropyran group being in the open-ring form after patterning, irradiating the quantum dot film with the visible light to cause the ring-closing reaction; or, In response to the spiropyran group being in the closed-ring form after patterning, the quantum dot film is irradiated with the ultraviolet light to cause the ring-opening reaction.

9. A light-emitting device, comprising a substrate, an anode, a light-emitting layer and a cathode sequentially stacked on the substrate, wherein the light-emitting layer comprises a quantum dot film layer, characterized in that: The quantum dot film layer is made by the quantum dot patterning method described in any one of claims 6 to 8; wherein the quantum dot material in the quantum dot film layer includes a quantum dot body and at least one photosensitive group connected to the quantum dot body; wherein the photosensitive group is a spiropyran group, and the spiropyran group undergoes a ring-opening reaction or a ring-closing reaction under different preset conditions.

10. A display device, characterized in that: Comprising a light emitting device as claimed in claim 9.

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