Preparation method of quantum dot filter layer, quantum dot filter layer and spectrometer
By using HgSe colloidal quantum dots as the filter layer, the high cost, low resolution and stability problems of existing extreme long-wave infrared spectral detectors are solved, and spectrometer performance with high stability and sensitivity is achieved.
Patent Information
- Application Number
- CN202411780821.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-04-11
AI Technical Summary
Existing extreme long-wave infrared spectral detectors have high cost, low resolution and limitations on specific band filtering capabilities, and are less stable in extreme environments.
Using HgSe colloidal quantum dots as the filter layer, the initial quantum dot solution, ligand exchange and final quantum dot solution of HgSe colloid is prepared to form a quantum dot filter layer to improve the performance of the spectrometer.
It achieves high stability and sensitivity in extreme environments, and has good conductivity and optical response, which significantly improves the applicability of the ultra-long wave infrared spectrometer.
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Figure CN119799336A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of optical construction of quantum dots, and in particular to a method for preparing a quantum dot filter layer, a quantum dot filter layer and a spectrometer. Background Art
[0002] The application of Hg-based quantum dots in very long wave infrared (VLWIR) spectral detection is of great significance, especially when used as a filter layer, which provides unique advantages for the performance of infrared spectrometers. The application of traditional infrared detectors in the very long wave infrared band is limited by the challenges of material properties, stability and manufacturing processes, and these shortcomings are particularly prominent under the harsh requirements of the space environment. Existing technologies mostly use semiconductor materials such as HgCdTe (mercury cadmium telluride), but their preparation is complex and costly, and there are certain limitations on the controllability of the wavelength. In addition, the detection sensitivity of HgCdTe materials in the long wave band is affected by lattice defects and preparation inhomogeneities, resulting in a low signal-to-noise ratio, which is not suitable for use in ultra-high resolution and ultra-wide field of view environments.
[0003] Application Contents
[0004] In view of the above problems, the present application provides a method for preparing a quantum dot filter layer, a quantum dot filter layer and a spectrometer.
[0005] In a first aspect, a method for preparing a quantum dot filter layer is provided, comprising:
[0006] preparing an initial quantum dot solution of HgSe colloid;
[0007] preparing a ligand dispersant;
[0008] Adding the initial quantum dot solution to the ligand dispersant to perform ligand exchange, thereby obtaining a final quantum dot solution of HgSe colloid;
[0009] The final quantum dot solution is used to prepare a quantum dot filter layer.
[0010] The step of preparing the initial quantum dot solution of HgSe colloid comprises:
[0011] preparing a Hg precursor solution and a Se precursor solution;
[0012] The Se precursor solution is injected into the Hg precursor solution to obtain an initial quantum dot solution of HgSe colloid.
[0013] The steps of preparing the Hg precursor solution and the Se precursor solution include:
[0014] Adding HgCl2 to the oleylamine solution, heating and stirring, thereby obtaining the Hg precursor solution;
[0015] SeS2 is added to the oleylamine solution, and the solution is heated, stirred and cooled to obtain the Se precursor solution.
[0016] The step of injecting the Se precursor solution into the Hg precursor solution to obtain an initial quantum dot solution of HgSe colloid comprises:
[0017] heating the Hg precursor solution, and injecting the Se precursor solution into the heated Hg precursor solution to obtain a first mixed solution;
[0018] adding SeS2 solution to the first mixed solution to obtain a second mixed solution;
[0019] The second mixed solution is mixed with anhydrous ethanol, shaken, and centrifuged to obtain a HgSe precipitate;
[0020] The HgSe precipitate is added into n-octane to obtain the initial quantum dot solution of the HgSe colloid.
[0021] Wherein, the step of adding SeS2 solution to the first mixed solution to obtain the second mixed solution comprises:
[0022] The SeS2 solution is added to the first mixed solution at a preset dripping speed within a preset time to obtain a second mixed solution.
[0023] Wherein, the step of preparing the ligand dispersant comprises:
[0024] n-butylamine, mercaptoethanol and HgCl2 are added dropwise to N,N-dimethylformamide and mixed evenly to obtain a first mixed ligand dispersant;
[0025] Add n-butylamine and mercaptoethanol dropwise into N,N-dimethylformamide and mix well to obtain a second mixed ligand dispersant;
[0026] Adding As2S3 solution to n-butylamine and shaking the solution to obtain a third mixed ligand dispersant;
[0027] Adding Na2S·9H2O solution to N,N-dimethylformamide and heating to obtain a fourth mixed ligand dispersant;
[0028] Adding (NH4)2S solution to N,N-dimethylformamide to obtain a fifth mixed ligand dispersant;
[0029] Wherein, the ligand dispersant includes the first mixed ligand dispersant, the second mixed ligand dispersant, the second mixed ligand dispersant, the fourth mixed ligand dispersant, and the fifth mixed ligand dispersant.
[0030] The step of adding the initial quantum dot solution to the ligand dispersant to perform ligand exchange to obtain a final quantum dot solution of HgSe colloid comprises:
[0031] The first mixed ligand dispersant, the second mixed ligand dispersant, the third mixed ligand dispersant, the fourth mixed ligand dispersant, the fifth mixed ligand dispersant and the initial quantum dot solution are mixed in a preset ratio and shaken for ligand exchange to obtain a final quantum dot solution of HgSe colloid.
[0032] In a second aspect, the present application provides a quantum dot filter layer, which is prepared by any of the methods described above.
[0033] In a third aspect, the present application provides a spectrometer, comprising:
[0034] A detection unit, used for detecting an optical signal;
[0035] A quantum dot filter layer is disposed on the surface of the detection unit; wherein the quantum dot filter layer is prepared by any of the methods described above;
[0036] A signal processing unit is connected to the detection unit and is used to process the optical signal detected by the detection unit.
[0037] Wherein, the detection unit comprises a plurality of detection units, and the plurality of detection units are arranged in an array;
[0038] The quantum dot filter layers include a plurality of layers; and the plurality of quantum dot filter layers are arranged in one-to-one correspondence with the detection units.
[0039] The technical solution provided in the embodiment of the present application uses the quantum dot filter layer prepared by the final quantum dot solution of HgSe colloid, which has good conductivity and optical response, while enhancing its stability in extreme environments.
[0040] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS
[0041] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:
[0042] Figure 1 It is a schematic diagram of a process of an embodiment of a method for preparing a quantum dot filter layer of the present application;
[0043] Figure 2 It is a structural schematic diagram of an embodiment of the spectrometer of the present application;
[0044] Figure 3 This is a schematic diagram of the absorption wavelength spectrum of quantum dots in this application;
[0045] Figure 4 This is the TEM image of quantum dots and the statistical graph of particle size distribution of this application;
[0046] Figure 5 This is a graph showing the relationship between the absorption wavelength and size of quantum dots in this application. DETAILED DESCRIPTION
[0047] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.
[0048] Various structural schematic diagrams according to embodiments of the present disclosure are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may further design regions / layers with different shapes, sizes, and relative positions according to actual needs.
[0049] In the infrared spectrum (especially the long-wave and very long-wave ranges), traditional spectrometers have problems such as insufficient resolution, low detection sensitivity, weak anti-interference ability, and large size in space observation and detection applications. In addition, current materials have poor stability in dealing with extreme space environments (such as high-energy radiation, low temperatures, etc.), resulting in degradation of detector performance.
[0050] Hg-based quantum dots provide a new solution as a filter layer, with the characteristics of flexible structure and adjustable band gap. The light absorption peak position of quantum dots can be precisely adjusted by regulating their size, composition and surface ligands, thereby covering a variety of specific wavelength requirements in the very long-wave infrared band. In addition, the preparation process of Hg-based quantum dots is relatively simple and low-cost, and they have a unique plasma effect when they are larger in size, which makes it possible to improve the signal-to-noise ratio of very long-wave infrared detectors in this band.
[0051] Mercury selenide is a negative bandgap semiconductor composed of group II-VI elements, with a bandgap of -0.24 eV, a zinc-blende crystal structure, and an exciton Bohr radius of about 17 nm. For HgSe colloidal quantum dots, the quantum dot radius R is smaller than the exciton Bohr radius of the material, so the bandgap can be changed by adjusting the size of the HgSe colloidal quantum dots. In addition, existing studies have shown that HgSe colloidal quantum dots show strong mid-infrared absorption between the lowest energy level 1Se and the next energy level 1Pe, which provides the possibility for in-band quantum dot devices.
[0052] Mercury telluride is a negative bandgap semimetal material with an exciton Bohr radius of 39nm. With the help of the "quantum confinement effect", the photoresponse of HgTe colloidal quantum dots can cover the short-wave, medium-wave and long-wave infrared bands, making it an ideal material for preparing colloidal quantum dot infrared detectors. At the same time, some studies have prepared very long-wave photoconductive detectors using HgTe quantum dots.
[0053] The technical problem of this application is to address the high cost, low resolution and limited filtering capability of existing very long wave infrared spectrometers. By introducing Hg-based quantum dots as a filter layer, more accurate spectral selectivity can be achieved while maintaining high stability and sensitivity. This will significantly improve the applicability of very long wave infrared spectrometers in aerospace and other fields, and provide better detection methods for applications such as long wave infrared early warning systems in high energy radiation environments.
[0054] In view of this, the present application provides a method for preparing a quantum dot filter layer, comprising: preparing an initial quantum dot solution of HgSe colloid; preparing a ligand dispersant; adding the initial quantum dot solution to the ligand dispersant to perform ligand exchange to obtain a final quantum dot solution of HgSe colloid; and using the final quantum dot solution to prepare a quantum dot filter layer.
[0055] The ultrasonic imaging device of the present application is described in detail below with reference to the accompanying drawings.
[0056] See first Figure 1 , Figure 1 This is a schematic diagram of a process of an embodiment of a method for preparing a quantum dot filter layer of the present application, which specifically includes:
[0057] Step S11: preparing an initial quantum dot solution of HgSe colloid.
[0058] In one embodiment, a Hg precursor solution and a Se precursor solution need to be prepared first, and the Se precursor solution is injected into the Hg precursor solution to obtain an initial quantum dot solution of HgSe colloid.
[0059] In one embodiment, the process of preparing the Hg precursor solution is: adding HgCl2 to the oleylamine solution, and heating and stirring, thereby obtaining the Hg precursor solution. Specifically, in a glove box, an electronic balance is used to weigh 120-140 mg (e.g., 136 mg) of HgCl2 into a 50 mL glass bottle, and 4-8 mL (e.g., 6 mL) of OLA (oleylamine solution) is injected, and then the glass bottle is placed on a heating table at 80-130° C. (e.g., 115° C.) for continuous heating and stirring until the solution becomes clear, at which time a Hg precursor solution is formed.
[0060] In one embodiment, the process of preparing a precursor solution of Se is as follows: SeS2 is added to an oleylamine solution, and the mixture is heated, stirred, and cooled to obtain the precursor solution of Se. Specifically, 140 to 150 mg (e.g., 143 mg) of SeS2 is weighed in a 10 mL glass bottle using an electronic balance in a glove box, and 1 to 3 mL (e.g., 2 mL) of OLA (oleylamine solution) is injected, and then the glass bottle is placed on a heating table at 120 to 150° C. (e.g., 140° C.) and continuously heated and stirred for 40 to 60 minutes. In specific practice, stirring can be performed for 30 minutes until the particles are completely dissolved and become a brown liquid, and then stirring is stopped, the heating table is turned off, and it is cooled to room temperature to obtain a 0.5 mol / L SeS2 prepared Se precursor solution.
[0061] The Se precursor solution is injected into the Hg precursor solution to obtain an initial quantum dot solution of HgSe colloid, specifically:
[0062] 1) The Hg precursor solution is heated, and the Se precursor solution is injected into the heated Hg precursor solution to obtain a first mixed solution.
[0063] Specifically, the clarified Hg precursor solution is heated to 120-130°C (for example, heated to 130°C) on a heating table, 200-300 μL (for example, 250 μL) of Se precursor solution, i.e., 0.5 mol / L SeS2, is rapidly injected into the Hg precursor solution, and the solution is observed to rapidly turn dark brown, which means the formation of HgSe colloidal quantum dot cores, thereby obtaining a first mixed solution.
[0064] 2) Adding SeS2 solution to the first mixed solution to obtain a second mixed solution.
[0065] Specifically, a 0.05 mol / L HgSe solution (the HgSe solution at this time is a low-concentration Se solution) is added dropwise into the first mixed solution using a syringe pump. In a specific embodiment, SeS2 solution is added to the first mixed solution at a preset dripping rate, such as 0.3 ml / min, within a preset time, such as 20 min, to obtain a second mixed solution.
[0066] 3) The second mixed solution is mixed with anhydrous ethanol, shaken, and centrifuged to obtain a HgSe precipitate.
[0067] Specifically, the dark brown solution after the reaction, i.e., the second mixed solution, was mixed with anhydrous ethanol in a volume ratio of 1:1, shaken several times, and then placed in a centrifuge for centrifugation at 6000 rpm for 2 minutes to obtain a HgSe black precipitate.
[0068] 4) adding the HgSe precipitate into n-octane to obtain the initial quantum dot solution of the HgSe colloid.
[0069] Specifically, the HgSe precipitate is dispersed in n-octane at a concentration of 15 mg / mL, thereby obtaining the initial quantum dot solution of the HgSe colloid.
[0070] Step S12: preparing a ligand dispersant.
[0071] Specifically, step S12 includes:
[0072] 1) n-Butylamine, mercaptoethanol and HgCl2 are added dropwise to N,N-dimethylformamide and mixed evenly to obtain a first mixed ligand dispersant.
[0073] 0.5-1 mmol (e.g. 0.5 mmol) of HgCl2, 120-150 μL (e.g. 140 μL) of mercaptoethanol and 300-500 μL (e.g. 400 μL) of n-butylamine are added dropwise into 5-10 mL (e.g. 5 mL) of N, N-dimethylformamide (DMF) and mixed evenly to obtain a first mixed ligand dispersant containing HgCl2.
[0074] 2) n-Butylamine and mercaptoethanol are added dropwise to N,N-dimethylformamide and mixed evenly to obtain a second mixed ligand dispersant.
[0075] 120-150 μL (e.g. 140 μL) of mercaptoethanol and 300-500 μL (e.g. 400 μL) of n-butylamine are added dropwise into 5-10 mL (e.g. 5 mL) of N,N-dimethylformamide (DMF) and mixed evenly to obtain a second mixed ligand dispersant that does not contain HgCl2.
[0076] 3) Add As2S3 solution to n-butylamine and shake the solution to obtain a third mixed ligand dispersant.
[0077] In a glove box, take excess As2S3 and dissolve it in n-butylamine (BTA), shake it on an oscillator to fully dissolve the solid, and obtain a yellow transparent solution, which is the third mixed ligand dispersant. The third mixed ligand dispersant is As2S3 ligand dispersant.
[0078] 4) Adding Na2S·9H2O solution to N,N-dimethylformamide and heating to obtain a fourth mixed ligand dispersant.
[0079] Take an excess of Na2S·9H2O and dissolve it in DMF, and continue to heat it at 30-40°C (for example, 30°C) on a heating table until the solid no longer dissolves, to obtain a supersaturated Na2S·9H2O / DMF blue transparent solution, which is the fourth mixed ligand dispersant. The fourth mixed ligand dispersant is a Na2S·9H2O ligand dispersant.
[0080] 5) Add (NH4)2S solution to N,N-dimethylformamide to obtain a fifth mixed ligand dispersant.
[0081] A certain amount of (NH4)2S solvent is injected into DMF to obtain a 1 mol / L (NH4)2S / DMF green transparent solution to obtain the fifth mixed ligand dispersant. The fifth mixed ligand dispersant is a (NH4)2S ligand dispersant.
[0082] It should be noted that the ligand dispersant in step S12 includes the first mixed ligand dispersant, the second mixed ligand dispersant, the second mixed ligand dispersant, the fourth mixed ligand dispersant, and the fifth mixed ligand dispersant.
[0083] Step S13: adding the initial quantum dot solution into the ligand dispersant to perform ligand exchange, thereby obtaining a final quantum dot solution of HgSe colloid.
[0084] The first mixed ligand dispersant, the second mixed ligand dispersant, the third mixed ligand dispersant, the fourth mixed ligand dispersant, the fifth mixed ligand dispersant and the initial quantum dot solution are mixed in a preset ratio and shaken for ligand exchange to obtain a final quantum dot solution of HgSe colloid.
[0085] In a specific embodiment, 1 mL of purified HgSe colloidal quantum dot n-octane (OCT) solution with a concentration of 15 mg / mL, i.e., the initial quantum dot solution of HgSe colloid, is added to the first mixed ligand dispersant, the second mixed ligand dispersant, the third mixed ligand dispersant, the fourth mixed ligand dispersant, and the fifth mixed ligand dispersant with a volume ratio of 1:1. Since OCT is a non-polar solvent and DMF is a polar solvent, the polarity difference between the two is large and they cannot be miscible, so obvious stratification can be seen. The glass bottle is placed on an oscillator and fully shaken for 2 to 3 minutes. After standing, stratification occurs again. At this time, the quantum dots have been transferred from the non-polar phase to the lower polar phase, and the surface ligands of the HgSe quantum dots have been exchanged from the long-chain oleylamine ligands to the composite ligands. At this time, the final quantum dot solution of HgSe colloid is obtained.
[0086] Step S14: using the final quantum dot solution to prepare a quantum dot filter layer.
[0087] The HgSe quantum dot solution after ligand exchange, i.e., the final quantum dot solution of HgSe colloid, is spin-coated on a transparent quartz substrate to form a quantum dot filter layer with a thickness of about 100 nm. The coated substrate is dried at 80-100° C. for 30-40 minutes to improve the coating stability and remove the residual solvent, thereby obtaining a quantum dot filter layer.
[0088] The method for preparing the quantum dot filter layer of this embodiment controls the size and shape of HgSe quantum dots through chemical synthesis, so that it has an adjustable absorption peak position within a specific infrared band, thereby realizing the detection of long-wave and very long-wave infrared light.
[0089] According to the embodiment, by selecting a suitable temperature and adjusting the concentration of the precursor during nucleation and growth, HgSe colloidal quantum dots with different absorption wavelengths can be obtained. The quantum dot response spectrum is obtained by Fourier transform infrared spectrometer (FTIR) test. Figure 3 ( Figure 3 (Fig. 1 is a schematic diagram of the quantum dot absorption wavelength spectrum) and as shown in Table 1, the quantum dots have a good response in the long-wave infrared region; the peak absorption wavelength of quantum dot 001 is 8.8μm, the peak absorption wavelength of 002 is 15.4μm, the peak absorption wavelength of device 003 is 16.7μm, and the peak absorption wavelength of device 004 is 20.9μm.
[0090] The quantum dot sizes in different response bands were measured by transmission electron microscopy, the particle size distribution was statistically analyzed, and a curve diagram showing the relationship between the quantum dot size and its corresponding absorption wavelength was drawn, such as Figure 4 ( Figure 4 TEM image of quantum dots and statistical graph of particle size distribution) and Figure 5 ( Figure 5 The relationship between quantum dot absorption wavelength and size is shown in the figure. The diameter of quantum dot 001 is 7.55nm, the diameter of quantum dot 002 is 14.59nm, the diameter of quantum dot 003 is 18.15nm, and the diameter of quantum dot 004 is 43.14nm.
[0091] Table 1: Summary of quantum dot absorption wavelength test results
[0092]
[0093]
[0094] The final quantum dot solution of the synthesized HgSe colloid is prepared into a quantum dot filter layer film, and high temperature and high pressure sintering and other technologies are used to ensure that the quantum dot filter layer has good conductivity and optical response, while enhancing its stability in extreme environments.
[0095] The present application also provides a quantum dot filter layer, which is prepared by the above-mentioned preparation method and will not be described in detail here.
[0096] See also Figure 2 The present application also provides a spectrometer, including: a detection unit 21, a quantum dot filter layer 22 and a signal processing unit 23. The detection unit 21 is used to detect light signals. The quantum dot filter layer 22 is arranged on the surface of the detection unit 21; wherein, the quantum dot filter layer is prepared by the method described above. It should be noted that when preparing the quantum dot filter layer, the final quantum dot solution of HgSe colloid can be directly spin-coated on the surface of the detection unit 21, and then dried and other treatments are performed. The signal processing unit 23 is connected to the detection unit 21, and is used to process the light signal detected by the detection unit.
[0097] In one embodiment, the detection units 21 include a plurality, and the plurality of detection units 21 are arranged in an array; the quantum dot filter layers 22 include a plurality, and the plurality of quantum dot filter layers 22 are arranged in a one-to-one correspondence with the detection units 21 .
[0098] The core of the spectrometer is the colloidal quantum dot infrared detector. This application improves the optical coupling efficiency and detection sensitivity of the spectrometer by adjusting the thickness of the quantum dot layer, the doping material, and the microcavity structure optimized by combining specific optical design. The prepared detector (detection unit and the quantum dot filter layer on the surface of the detection unit) is integrated into a lightweight spectrometer, and a high-radiation-resistant packaging technology is adopted to adapt it to the extreme temperature and radiation conditions in the space environment.
[0099] The spectrometer of the present application can perform high-resolution and wide-band detection. Specifically, by adjusting the size of HgSe quantum dots, efficient absorption can be achieved in the long-wave and very long-wave infrared ranges, meeting the detection needs of high resolution and wide spectrum, and is particularly suitable for ultra-wide field of view applications in space infrared detection.
[0100] The spectrometer device of the present application is lightweight: the use of colloidal quantum dot materials greatly reduces the overall weight of the spectrometer, making it easier to use in space payloads, and compared to traditional detectors, it has a smaller size and lower power consumption.
[0101] The spectrometer of the present application has low manufacturing cost: compared with detectors based on traditional infrared materials, the colloidal quantum dot material used in the present invention can be prepared on a large scale through a solution process, which significantly reduces the manufacturing cost of the spectrometer.
[0102] The algorithm and display provided herein are not inherently related to any particular computer, virtual system or other device. Various general purpose systems can also be used together with the teachings based on this. According to the above description, it is obvious that the structure required for constructing such systems. In addition, the application is not directed to any specific programming language either. It should be understood that various programming languages can be utilized to realize the content of the application described herein, and the description of the specific language above is for the purpose of disclosing the best mode of implementation of the application.
[0103] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.
[0104] Similarly, it should be understood that in order to streamline the present disclosure and assist in understanding one or more of the various aspects of the application, in the above description of exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof.
[0105] Those skilled in the art will appreciate that the modules in the device in the embodiment can be adaptively changed and arranged in one or more devices different from the embodiment. The modules or units or components in the embodiment can be combined into one module or unit or component, and in addition they can be divided into multiple submodules or subunits or subcomponents. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including abstracts and drawings) and all processes or units of any method or device disclosed in this manner can be combined in any combination. Unless otherwise explicitly stated, each feature disclosed in this specification (including accompanying abstracts and drawings) can be replaced by alternative features that provide the same, equivalent or similar purposes.
[0106] Furthermore, those skilled in the art will appreciate that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is meant to be within the scope of the present application and to form different embodiments.
[0107] It should be noted that the above embodiments illustrate the present application rather than limit the present application. Any reference symbol between brackets should not be constructed as a limitation to the present application. The word "comprising" does not exclude the existence of components or steps not listed in the present application. The word "one" or "an" before a component does not exclude the existence of multiple such components. The present application can be implemented by means of hardware including several different components and by means of a suitably programmed computer. In the embodiments in which several devices are listed, several of these devices can be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words can be interpreted as names.
Claims
1. A method for preparing a quantum dot filter layer, characterized in that: include: preparing an initial quantum dot solution of HgSe colloid; preparing a ligand dispersant; Adding the initial quantum dot solution to the ligand dispersant to perform ligand exchange, thereby obtaining a final quantum dot solution of HgSe colloid; The final quantum dot solution is used to prepare a quantum dot filter layer.
2. The preparation method according to claim 1, characterized in that: The steps of preparing an initial quantum dot solution of HgSe colloid include: preparing a Hg precursor solution and a Se precursor solution; The Se precursor solution is injected into the Hg precursor solution to obtain an initial quantum dot solution of HgSe colloid.
3. The preparation method according to claim 2, characterized in that: The steps of preparing a Hg precursor solution and a Se precursor solution include: Adding HgCl2 to the oleylamine solution, heating and stirring, thereby obtaining the Hg precursor solution; SeS2 is added to the oleylamine solution, and the solution is heated, stirred and cooled to obtain the Se precursor solution.
4. The preparation method according to claim 3, characterized in that: The step of injecting the Se precursor solution into the Hg precursor solution to obtain an initial quantum dot solution of HgSe colloid comprises: heating the Hg precursor solution, and injecting the Se precursor solution into the heated Hg precursor solution to obtain a first mixed solution; adding SeS2 solution to the first mixed solution to obtain a second mixed solution; The second mixed solution is mixed with anhydrous ethanol, shaken, and centrifuged to obtain a HgSe precipitate; The HgSe precipitate is added into n-octane to obtain the initial quantum dot solution of the HgSe colloid.
5. The preparation method according to claim 4, characterized in that: The step of adding SeS2 solution to the first mixed solution to obtain a second mixed solution comprises: The SeS2 solution is added to the first mixed solution at a preset dripping speed within a preset time to obtain a second mixed solution.
6. The preparation method according to claim 1, characterized in that: The steps of preparing the ligand dispersant include: n-butylamine, mercaptoethanol and HgCl2 are added dropwise to N,N-dimethylformamide and mixed evenly to obtain a first mixed ligand dispersant; Add n-butylamine and mercaptoethanol dropwise into N,N-dimethylformamide and mix well to obtain a second mixed ligand dispersant; Adding As2S3 solution to n-butylamine and shaking the solution to obtain a third mixed ligand dispersant; Adding Na2S·9H2O solution to N,N-dimethylformamide and heating to obtain a fourth mixed ligand dispersant; Adding (NH4)2S solution to N,N-dimethylformamide to obtain a fifth mixed ligand dispersant; Wherein, the ligand dispersant includes the first mixed ligand dispersant, the second mixed ligand dispersant, the second mixed ligand dispersant, the fourth mixed ligand dispersant, and the fifth mixed ligand dispersant.
7. The preparation method according to claim 6, characterized in that: The step of adding the initial quantum dot solution to the ligand dispersant to perform ligand exchange to obtain a final quantum dot solution of HgSe colloid comprises: The first mixed ligand dispersant, the second mixed ligand dispersant, the third mixed ligand dispersant, the fourth mixed ligand dispersant, the fifth mixed ligand dispersant and the initial quantum dot solution are mixed in a preset ratio and shaken for ligand exchange to obtain a final quantum dot solution of HgSe colloid.
8. A quantum dot filter layer, characterized in that: The quantum dot filter layer is prepared by the method described in any one of claims 1 to 7.
9. A spectrometer, characterized in that: include: A detection unit, used for detecting an optical signal; A quantum dot filter layer is arranged on the surface of the detection unit; wherein the quantum dot filter layer is prepared by the method described in any one of claims 1 to 7 above; A signal processing unit is connected to the detection unit and is used to process the optical signal detected by the detection unit.
10. The spectrometer according to claim 1, characterized in that: The detection units include a plurality of detection units, and the plurality of detection units are arranged in an array; The quantum dot filter layers include a plurality of layers; and the plurality of quantum dot filter layers are arranged in one-to-one correspondence with the detection units.