CN112909215A - Preparation method of quantum dot color conversion array - Google Patents
Preparation method of quantum dot color conversion array Download PDFInfo
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- CN112909215A CN112909215A CN202110124956.2A CN202110124956A CN112909215A CN 112909215 A CN112909215 A CN 112909215A CN 202110124956 A CN202110124956 A CN 202110124956A CN 112909215 A CN112909215 A CN 112909215A
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Abstract
The invention provides a preparation method of a quantum dot color conversion array, which comprises the following steps: s1, injecting a carrier into the micro-channel, then injecting a quantum dot solution into the micro-channel one by one, and enabling the quantum dot solution to fill the micro-channel at a preset interval through the flow of the carrier in the micro-channel; and S2, solidifying the quantum dot solution to form the quantum dot color conversion array. The preparation method has the advantages of simple process, simple and convenient operation and low cost, and can realize the preparation of the quantum dot color conversion array of the small-size pixels.
Description
Technical Field
The invention relates to the technical field of micro-nano preparation, in particular to a preparation method of a quantum dot color conversion array based on a micro-channel technology.
Background
At present, there are two main methods for preparing high-density and micro-pixel-size quantum dot color conversion arrays, namely ink-jet printing and photoresist doping patterning. The inkjet printing technique is limited by the precision of the apparatus, and the inkjet printing has characteristics that uniformity is difficult to control and a "coffee ring effect" is liable to occur, and is difficult to realize when the pattern is less than 20 μm or less. Although the photoresist doping patterning can realize the preparation of the quantum dot color conversion array with the small size of less than 10 microns, the doped photoresist easily degrades the quantum dots, reduces the conversion efficiency of the quantum dots and causes the waste of a large amount of quantum dots.
Disclosure of Invention
The invention aims to provide a preparation method of a quantum dot color conversion array, which can realize the preparation of the quantum dot color conversion array of small-size pixels based on a micron-sized micro-channel and has the advantages of simple process, simple and convenient operation and low cost.
In order to achieve the purpose, the invention adopts the following specific technical scheme:
the invention provides a preparation method of a quantum dot color conversion array, which comprises the following steps:
s1, injecting a carrier into the micro-channel, then injecting a quantum dot solution into the micro-channel one by one, and enabling the quantum dot solution to fill the micro-channel at a preset interval through the flow of the carrier in the micro-channel;
and S2, solidifying the quantum dot solution to form the quantum dot color conversion array.
Preferably, the carrier is a gas or a liquid.
Preferably, the gas is an inert gas or air.
Preferably, the liquid is water, oil, silicone grease or silica gel.
Preferably, the specific process of injecting the carrier into the micro flow channel is as follows:
injecting the carrier into a carrier pool communicated with the micro-channel through a micro-injection pump, and enabling the carrier to flow into the micro-channel from the carrier pool.
Preferably, the quantum dot solution is a quantum dot solution converted into a different color or a quantum dot solution converted into the same color.
Preferably, the specific process of injecting the quantum dot solution converted into the same color into the micro flow channel is as follows:
the quantum dot solution converted into the same color is injected into the same solution pool communicated with the micro flow channel through a micro injection pump, and the quantum dot solution flows into the micro flow channel from the solution pool.
Preferably, the specific process of injecting the quantum dot solution converted into different colors into the micro-channel is as follows:
the quantum dot solutions converted into different colors are respectively injected into different solution pools which are respectively communicated with the micro flow channels through different micro injection pumps, and the quantum dot solutions converted into different colors flow into the micro flow channels from the respective solution pools.
Preferably, the distance between two adjacent quantum dot solutions is adjusted by controlling the injection rate of the micro-syringe pump.
Preferably, the size of the quantum dot solution is adjusted by controlling the injection time and injection rate of the micro-syringe pump.
The invention can obtain the following technical effects:
1. the invention injects the quantum dot solution into the micro-channel by the micro-injection pump, and then carries out solidification, thus being capable of forming the preparation of the small-size quantum dot color conversion array with the size of less than 10 mu m.
2. The undoped photoresist in the quantum dot solution can not degrade the quantum dots and reduce the conversion efficiency of the quantum dots, so that a large amount of quantum dot waste can not be caused.
3. The preparation method can realize the preparation of the quantum dot color conversion array only by two steps of injection and solidification, and has the advantages of simple process, simple and convenient operation and low cost.
Drawings
FIG. 1 is a schematic view showing an external structure of a micro flow channel provided according to an embodiment of the present invention;
FIG. 2 is a schematic view showing the internal structure of a micro flow channel according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a process for preparing a quantum dot color conversion array according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a method for preparing a quantum dot color conversion array according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a composition manner of a quantum dot color conversion array in a quantum dot color conversion array according to an embodiment of the present invention.
Wherein the reference numerals include: the micro-channel substrate 1, the micro-channel cover plate 2, the carrier pool 3, the first solution pool 4, the second solution pool 5, the third solution pool 6, the micro-channel 7, the micro-channel outlet 8, the carrier 9, the first color quantum dot solution 10, the second color quantum dot solution 11, the third color quantum dot solution 12, the first color quantum dot 13, the second color quantum dot 14, the third color quantum dot 15, the first full-color display pixel unit 16, the second full-color display pixel unit 17, and the third full-color display pixel unit 18.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.
The embodiment of the invention provides a preparation method of a quantum dot color conversion array, which is implemented based on a micro flow channel, and the structure of the micro flow channel is described before the preparation method provided by the embodiment of the invention is explained.
Fig. 1 and 2 show an outer structure and an inner structure of a micro flow channel provided according to an embodiment of the present invention, respectively.
As shown in fig. 1 and 2, a micro flow channel provided by an embodiment of the present invention includes: the micro-channel substrate 1 is provided with a mask substrate, the micro-channel substrate 1 is provided with patterns, when the micro-channel substrate 1 is buckled with the micro-channel cover plate 2, a carrier pool 3, at least one solution pool, a micro-channel 7 and a micro-channel outlet 8 are formed, and the carrier pool 3 and the solution pool are respectively communicated with the micro-channel 7. The carrier pool 3 is used for injecting carriers, and the carriers flow into the micro flow channel 7 from the carrier pool 3. The solution pool is used for injecting quantum dot solution, and the quantum dot solution flows into the micro-channel 7 from the solution pool.
When the micro flow channel is provided with only one solution pool, if the quantum dot color conversion array only converts light of one color, the quantum dot solution converted into the same color can be injected into the solution pool by connecting the capillary tube with the micro injection pump, if the quantum dot color conversion array needs to convert light of different colors, different micro injection pumps can be replaced, and the quantum dot solution of different colors is injected into the solution pool, but the mode is not efficient. Preferably, different solution pools are formed, and the quantum dot solution converted into one color is injected into one solution pool, so that the quantum dot solution converted into a different color is injected into different solution pools, which can improve efficiency.
Fig. 3 shows a case of three solution pools, and three solution pools are taken as an example for explanation, the three solution pools are a first solution pool 4, a second solution pool 5 and a third solution pool 6, and the first solution pool 4, the second solution pool 5 and the third solution pool 6 are respectively used for injecting quantum dot solutions converted into three different colors.
In the preparation process of the quantum dot color conversion array, firstly, a carrier 9 is injected into a carrier pool 3 to enable the carrier to flow in a microchannel 7, then a first color quantum dot solution 10 is injected into a first solution pool 4, a second color quantum dot solution 11 is injected into a second solution pool 5, a third color quantum dot solution 12 is injected into a third solution pool 6, the first color quantum dot solution 10, the second color quantum dot solution 11 and the third color quantum dot solution 12 are respectively filled in the whole microchannel 7 at a certain interval under the flowing of the carrier 9, and finally the first color quantum dot solution 10, the second color quantum dot solution 11 and the third color quantum dot solution 12 are solidified to form a first color quantum dot 13, a second color quantum dot 14 and a third color quantum dot 15 which convert light into three different colors.
The first color quantum dot solution 10, the second color quantum dot solution 11 and the third color quantum dot solution 12 are respectively injected into the first solution pool 4, the second solution pool 5 and the third solution pool 6 through one micro-injection pump.
The invention can control the injection time and the injection rate of each micro-injection pump, control the sizes of the first color quantum dot solution 10, the second color quantum dot solution 11 and the third color quantum dot solution 12, control the starting time of each micro-injection pump, and control the arrangement sequence of the first color quantum dot solution 10, the second color quantum dot solution 11 and the third color quantum dot solution 12 in the micro-flow channel 7.
By controlling the injection rate of the micro-syringe pump used to inject the carrier, the spacing between two adjacent quantum dot solutions can be adjusted, for example: a distance between the first color quantum dot solution 10 and the second color quantum dot solution 11, a distance between the first color quantum dot solution 10 and the third color quantum dot solution 12, or a distance between the second color quantum dot solution 11 and the third color quantum dot solution 12.
The micro flow channel substrate 1 may be a transparent hard substrate such as glass, quartz, PMMA, and polymer, and the micro flow channel cover plate 2 may be a transparent flexible substrate such as PI, PET, PVA, PEN, or PDMS.
The embodiment of the invention can change the thickness of the quantum dots by controlling the height of the micro-channel 7.
The above details describe the structure of the micro flow channel provided in the embodiment of the present invention. Corresponding to the micro-channel, the invention also provides a method for preparing the quantum dot color conversion array by using the micro-channel.
Fig. 4 shows a flow of a method for preparing a quantum dot color conversion array according to an embodiment of the present invention.
As shown in fig. 4, the preparation method of the quantum dot color conversion array includes the following steps:
s1, injecting the carrier into the micro-channel, then injecting the quantum dot solution into the micro-channel one by one, and filling the quantum dot solution into the micro-channel at a preset interval by the flowing of the carrier in the micro-channel.
The carrier is used for driving the quantum dot solution to flow in the micro-channel and enabling the quantum dot solution to have a certain interval.
The carrier may be a gas or a liquid. When the carrier is gas, if the quantum dot solution which is not easy to oxidize is adopted, the carrier can be air, if the quantum dot solution which is easy to oxidize is adopted, the carrier is inert gas to prevent the quantum dot solution from being oxidized, and the inert gas can be any one or combination of helium, neon, argon, krypton, xenon and radon. When the carrier is liquid, the carrier can be liquid immiscible with the quantum dot solution, such as water, oil, silicone grease, silica gel, and other liquids.
The carrier can keep the clear boundary of the quantum dot solution in the micro-channel regardless of gas carrier or liquid carrier, and the independent quantum dot is formed after solidification. In addition, a surfactant may be added to the quantum dot solution to stabilize the quantum dot solution in the liquid vehicle.
In the embodiment of the invention, the micro-injection pump is connected with the capillary tube to inject the quantum dot solution into the solution pool. For the quantum dot solution converted into the same color by injection, the quantum dot solution can be injected into a solution pool through a micro-injection pump. For the quantum dot solution which is converted into different colors by injection, the quantum dot solution which is converted into each color is respectively injected into different solution pools by a micro injection pump, so that the quantum dot solutions of different colors are prevented from being mixed, and the injection efficiency can be improved.
The invention can control the injection time and the injection rate of each micro-injection pump, control the size of the quantum dot solution converted into different colors, control the starting time of each micro-injection pump, control the arrangement sequence of the quantum dot solution converted into different colors in a micro-channel, and adjust the distance between two adjacent quantum dot solutions by controlling the injection rate of the micro-injection pump used for injecting carriers.
And S2, solidifying the quantum dot solution to form the quantum dot color conversion array.
The invention can adopt the modes of high temperature or vacuum and the like to dry the reagent in the quantum dot solution to form the quantum dot. Because the quantum dots are prepared in the micro-channel, and the scale of the micro-channel is in the micron scale, the preparation method can prepare the quantum dot color conversion array with the small size of less than 10 mu m.
Compared with an ink-jet printing preparation mode, the problem of coffee ring effect is avoided, and the quantum dot color conversion array with the small size of less than 10 microns is easy to realize. Compared with a photoresist doping graphical mode, the undoped photoresist in the quantum dot solution can not degrade the quantum dots and reduce the conversion efficiency of the quantum dots, so that a large amount of quantum dot waste can not be caused.
In addition, the preparation method can realize the preparation of the quantum dot color conversion array only by two steps of injection and solidification, belongs to a physical process in the preparation process, does not have chemical reaction, and has the advantages of simple process, simple and convenient operation and low cost.
The quantum dots converted into different colors form a full-color display pixel unit, and the quantum dots with different colors in the quantum dot color conversion array can be selected to form the display pixel unit for displaying different colors.
Fig. 5 illustrates a manner of forming a quantum dot color conversion array in a quantum dot color conversion array provided according to an embodiment of the present invention.
As shown in fig. 5, the first full-color display pixel unit 16 is composed of three quantum dots in the same row, the second full-color display pixel unit 17 is composed of three quantum dots in the same column, and the third full-color display pixel unit 18 is composed of four quantum dots.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
The above embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A preparation method of a quantum dot color conversion array is characterized by comprising the following steps:
s1, firstly injecting a carrier into the micro-channel, then sequentially injecting a quantum dot solution into the micro-channel, and enabling the quantum dot solution to fill the micro-channel at a preset interval through the flow of the carrier in the micro-channel;
and S2, solidifying the quantum dot solution to form the quantum dot color conversion array.
2. The method of claim 1, wherein the carrier is a gas or a liquid.
3. The method of claim 2, wherein the gas is an inert gas or air.
4. The method of claim 1, wherein the liquid is water, oil, silicone grease, or silica gel.
5. The method for preparing a quantum dot color conversion array according to claim 1, wherein the specific process of injecting the carrier into the micro flow channel is as follows:
and injecting the carrier into a carrier pool communicated with the micro-channel through a micro-injection pump, wherein the carrier flows into the micro-channel from the carrier pool.
6. The method for preparing a quantum dot color conversion array according to claim 1, wherein the quantum dot solution is a quantum dot solution converted into a different color or a quantum dot solution converted into the same color.
7. The method for preparing the quantum dot color conversion array according to claim 6, wherein the specific process of injecting the quantum dot solution converted into the same color into the micro flow channel comprises:
and injecting the quantum dot solution converted into the same color into the same solution pool communicated with the micro-channel through a micro-injection pump, wherein the quantum dot solution flows into the micro-channel from the solution pool.
8. The method for preparing the quantum dot color conversion array according to claim 6, wherein the specific process of injecting the quantum dot solution converted into different colors into the micro flow channel comprises the following steps:
and respectively injecting the quantum dot solution converted into different colors into different solution pools which are respectively communicated with the micro-channel through different micro-injection pumps, and allowing the quantum dot solution converted into different colors to flow into the micro-channel from the respective solution pools.
9. The method for preparing the quantum dot color conversion array according to any one of claims 6 to 8, wherein the distance between two adjacent quantum dot solutions is adjusted by controlling the injection rate of a micro-injection pump.
10. The method for preparing a quantum dot color conversion array according to claim 7 or 8, wherein the size of the quantum dot solution is adjusted by controlling the injection time and injection rate of a micro-syringe pump.
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| WO2024098307A1 (en) * | 2022-11-09 | 2024-05-16 | 重庆康佳光电技术研究院有限公司 | Light conversion unit and manufacturing method therefor, display panel, and pixel unit |
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