CN111518541A - Preparation method of long-luminescence wavelength water-phase quantum dots - Google Patents

Preparation method of long-luminescence wavelength water-phase quantum dots Download PDF

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CN111518541A
CN111518541A CN202010451360.9A CN202010451360A CN111518541A CN 111518541 A CN111518541 A CN 111518541A CN 202010451360 A CN202010451360 A CN 202010451360A CN 111518541 A CN111518541 A CN 111518541A
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solution
quantum dot
wavelength
shell
core
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齐航
王建伟
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Ma'anshan Microcrystalline Photoelectric Material Co ltd
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Ma'anshan Microcrystalline Photoelectric Material Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/56—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing sulfur
    • C09K11/562—Chalcogenides
    • C09K11/565—Chalcogenides with zinc cadmium
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/88—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing selenium, tellurium or unspecified chalcogen elements
    • C09K11/881—Chalcogenides
    • C09K11/883—Chalcogenides with zinc or cadmium

Abstract

The invention discloses a preparation method of long-luminescence wavelength water-phase quantum dots, which comprises the following steps of firstly setting a core solution and a plurality of shell solutions; the core solution and the shell solution are quantum dot aqueous solutions formed by the same substance and have different light-emitting wavelengths, wherein the light-emitting wavelength of the core solution is longer, the light-emitting wavelength of the shell solution is shorter, and the difference between the light-emitting wavelength of the core solution and the light-emitting wavelength of the shell solution is 40-110 nm; then mixing the core solution and the shell solution to obtain a water-phase quantum dot mixed solution; and finally, heating the water phase quantum dot mixed solution, and reacting for a specified time to obtain the required long-wavelength luminescent water phase quantum dot. The invention utilizes the correlation principle to mix quantum dots with different sizes and made of the same material, heat and react for a certain time to prepare the quantum dots with larger grain diameter and longer luminous wavelength; the fast preparation of quantum dots with longer luminescence wavelength can be realized by the principle; the invention is simple, effective and easy to use.

Description

Preparation method of long-luminescence wavelength water-phase quantum dots
Technical Field
The invention belongs to the field of preparation of aqueous phase quantum dots, relates to an aqueous phase quantum preparation technology, and particularly relates to a preparation method of a long-luminescence wavelength aqueous phase quantum dot.
Background
Quantum dots are a class of luminescent materials that have been developed in recent years and receive much attention; in the preparation of quantum dots, the research is the most extensive at present, and relatively mature is the oil phase preparation, namely a method for preparing quantum dots in an organic solvent such as octadecene;
in addition to organic solvents, water is also a common solvent in chemical reactions, and in recent years, research on the preparation of quantum dots in an aqueous phase has been advanced to some extent. Compared with the preparation of the quantum dots in the oil phase, the preparation of the quantum dots in the water phase can be carried out through fewer processing steps, and the quantum dots can be extracted and applied to the required places with less consumption of other chemical reagents. In the process, the water phase quantum dots have the advantages of low energy consumption, low pollution and low cost.
However, the existing preparation method of the water-phase quantum dots is difficult to prepare the water-soluble quantum dots with longer light-emitting wavelength. For example, it is difficult to obtain cadmium selenide quantum dots with an emission wavelength of 600nm or more or cadmium telluride quantum dots with an emission wavelength of 650nm or more in an aqueous phase. This greatly restricts the application of aqueous phase quantum dots. The method for preparing the water-soluble quantum dot can prepare the water-soluble quantum dot with longer luminous wavelength and stronger luminous intensity.
In order to solve this technical problem, a solution is now provided.
Disclosure of Invention
The invention aims to provide a preparation method of long-luminescence wavelength aqueous phase quantum dots.
The purpose of the invention can be realized by the following technical scheme:
the preparation method of the long-luminescence-wavelength water-phase quantum dot comprises the following steps:
the method comprises the following steps: setting a core solution and a plurality of shell solutions;
the core solution and the shell solution are quantum dot solutions with specified light-emitting wavelengths, the light-emitting wavelength of the core solution is longer than that of the shell solution, and the difference value of the light-emitting wavelengths of the core solution and the shell solution is 40-110 nm;
step two: mixing the core solution and the shell solution to obtain a water-phase quantum dot mixed solution;
step three: and heating the water phase quantum dot mixed solution, and reacting for a specified time to obtain the required long-wavelength luminescent water phase quantum dot.
Further, the core solution and the shell solution are the same substance solution; when the cadmium telluride aqueous phase quantum dot solution is prepared, the core solution is the cadmium telluride aqueous phase quantum dot solution with the luminescent wavelength of 590-630 nm; the shell solution is one or a mixture of more cadmium telluride aqueous phase quantum dot solutions with the luminescent wavelength of 520-570 nm.
Further, the core solution and the shell solution are the same substance solution; when the cadmium selenide aqueous phase quantum dot solution is prepared, the nuclear solution is the cadmium selenide aqueous phase quantum dot solution with the luminescent wavelength of 530-580 nm; the shell solution is one or a mixture of several cadmium selenide aqueous phase quantum dot solutions with the luminescence wavelength of 490-530 nm.
Further, the ratio of cadmium-tellurium elements in the core solution and the shell solution is in the range of 10:1 to 1:1, and the ratio of the amount of cadmium elements in the core solution and the shell solution is in the range of 1:0.3 to 1: 7.
Further, in the third step, the aqueous phase quantum dot mixed solution is heated, and the heating method comprises normal pressure heating and high pressure heating.
Further, in the normal pressure heating reaction, the heating temperature is set in boiling water of 55-99 ℃; the heating time is controlled to be 1-16 hours; the normal pressure heating reaction can be carried out under the protection of inert gas or without the protection of inert gas.
Further, in the high-pressure heating reaction, a hydrothermal method is specifically adopted, and the hydrothermal method specifically comprises the following processes:
the method comprises the following steps: placing the reaction solution in a high-pressure reaction kettle;
step two: then heating at a heating temperature higher than the boiling point of water;
at this time, the pressure of the high-pressure heating reaction is determined by the heating temperature; the heating temperature is controlled between 103 ℃ and 240 ℃; the heating time is controlled to be 30 minutes to 10 hours.
Further, the water high-pressure heating reaction is realized by an HP301-450 ultrahigh-pressure reaction device, the heating temperature is set to be 70-350 ℃, and the heating time is set to be 3-180 minutes.
Further, the core solution and the shell solution are different substance solutions, the core solution and the shell solution form a core-shell structure, and the core-shell structure is a core solution-shell solution; the core-shell structure comprises cadmium telluride-cadmium selenide, cadmium telluride-cadmium sulfide, cadmium selenide-zinc selenide, cadmium selenide-zinc sulfide and cadmium sulfide-zinc sulfide.
The invention has the beneficial effects that:
in the conventional method for preparing the water-phase quantum dots, if the water-phase quantum dots with longer luminescence wavelength are to be prepared, a material is usually added for a plurality of times, that is, a substance containing elements for forming the quantum dots is added. When the aqueous phase quantum dot is prepared by such a method, the emission intensity is greatly reduced as the emission wavelength becomes longer, and the size distribution of the quantum dot is widened (the half-width becomes larger). The method adopted by the invention can be used for preparing the water-phase quantum dots with longer luminescent wavelength, and simultaneously, the method still maintains stronger luminescent intensity and narrower quantum dot size distribution (the half-peak width is smaller or only slightly larger). Meanwhile, the method of the invention is simple and convenient to operate.
Detailed Description
The preparation method of the long-luminescence-wavelength water-phase quantum dot comprises the following steps:
the method comprises the following steps: setting a core solution and a plurality of shell solutions;
the core solution and the shell solution are quantum dot solutions with specified light-emitting wavelengths, the light-emitting wavelength of the core solution is longer than that of the shell solution, and the difference value of the light-emitting wavelengths of the core solution and the shell solution is 40-110 nm;
wherein, the core solution and the shell solution are the same substance solution; when the cadmium telluride aqueous phase quantum dot solution is prepared, the core solution is the cadmium telluride aqueous phase quantum dot solution with the luminescent wavelength of 590-630 nm; the shell solution is one or a mixture of more cadmium telluride aqueous phase quantum dot solutions with the luminescent wavelength of 520-570 nm.
Wherein, the core solution and the shell solution are the same substance solution; when the cadmium selenide aqueous phase quantum dot solution is prepared, the nuclear solution is the cadmium selenide aqueous phase quantum dot solution with the luminescent wavelength of 530-580 nm; the shell solution is one or a mixture of several cadmium selenide aqueous phase quantum dot solutions with the luminescence wavelength of 490-530 nm.
Wherein, the ratio of cadmium-tellurium elements in the core solution and the shell solution is in the range of 10:1 to 1:1, and the ratio of the amount of cadmium elements in the core solution and the shell solution is in the range of 1:0.3 to 1: 7.
Step two: mixing the core solution and the shell solution to obtain a water-phase quantum dot mixed solution;
step three: and heating the water phase quantum dot mixed solution, and reacting for a specified time to obtain the required long-wavelength luminescent water phase quantum dot.
Heating the water phase quantum dot mixed solution in the third step, wherein the heating method comprises normal pressure heating and high pressure heating;
in the normal pressure heating reaction, the heating temperature is set in boiling water at 55-99 ℃; the heating time is controlled to be 1-16 hours; the normal pressure heating reaction can be carried out under the protection of inert gas or without the protection of inert gas.
In the high-pressure heating reaction, a hydrothermal method is specifically adopted, and the hydrothermal method specifically comprises the following processes:
the method comprises the following steps: placing the reaction solution in a high-pressure reaction kettle;
step two: then heating at a heating temperature higher than the boiling point of water;
at this time, the pressure of the high-pressure heating reaction is determined by the heating temperature; the heating temperature is controlled between 103 ℃ and 240 ℃; the heating time is controlled to be 30 minutes to 10 hours.
The water high-pressure heating reaction is realized by an HP301-450 ultrahigh-pressure reaction device, the heating temperature is set to be 70-350 ℃, and the heating time is set to be 3-180 minutes. The HP301-450 ultrahigh pressure reaction device can apply different pressures to the reaction system, and the applied pressure is greater than the maximum pressure which can be achieved in the hydrothermal reaction.
The core solution and the shell solution can be different solutions, the core-shell structure quantum dot structure is a core-shell structure, and the specific structure of the core-shell structure quantum dot structure comprises but is not limited to (a core material is arranged in front of a "-", and a shell material is arranged behind the "-"), cadmium telluride-cadmium selenide, cadmium telluride-cadmium sulfide, cadmium selenide-zinc selenide, cadmium selenide-zinc sulfide, and cadmium sulfide-zinc sulfide.
Of course, as an extended embodiment of the present invention, the core-shell structure quantum dot structure may also be "core-shell", "core-shell", and its specific structure includes, but is not limited to, cadmium telluride-cadmium selenide-cadmium sulfide-zinc sulfide, cadmium selenide-cadmium sulfide-zinc sulfide; during the preparation of the core-shell and core-shell structure quantum dot structure, after a first layer of shell layer is wrapped, a single-substance aqueous phase quantum dot solution formed by a second layer of shell layer material is added, then the aqueous phase quantum dot mixed solution is heated and reacts for a period of time at a certain temperature to obtain the required long-luminescence wavelength aqueous phase quantum dot solution; if a third shell layer is provided, the coating is carried out by adopting a similar method.
The shell solution can be formed by mixing three kinds of solutions, namely, a solution containing specific cations, a solution containing specific anions and a solution containing specific organic molecules, except for a single-substance aqueous phase quantum dot solution formed by corresponding materials; the pH of the shell solution may be adjusted with an aqueous acid or base solution, and the base solution used to adjust the pH includes, but is not limited to, lithium hydroxide, sodium hydroxide, potassium hydroxide, rubidium hydroxide, cesium hydroxide, tetramethylammonium hydroxide, ammonia; acid solutions used to adjust the PH include, but are not limited to, hydrochloric acid, dilute sulfuric acid, formic acid, acetic acid, propionic acid, butyric acid.
The cation in the solution containing the specific cation is cadmium ion and zinc ion, or simultaneously contains cadmium ion and zinc ion; anions in solutions containing particular cations include, but are not limited to: chloride ion, bromide ion, iodide ion, acetate ion, sulfate ion and nitrate ion.
The solution containing specific anions is one or more of tellurium ions, selenium ions and sulfur ions; cations in solutions containing particular anions include, but are not limited to: lithium ion, sodium ion, potassium ion, rubidium ion, cesium ion, and ammonium ion.
Organic molecules in solutions containing specific organic molecules include, but are not limited to: thioglycolic acid, mercaptopropionic acid, 2-mercaptopropionic acid, mercaptosuccinic acid, thioglycerol, cysteine and citric acid.
In the specific implementation process of the invention:
the method specifically comprises the following steps of aiming at the long-luminous-wavelength cadmium telluride structure aqueous phase quantum dots:
the core is a cadmium telluride aqueous phase quantum dot, the light-emitting position is 607nm, and the half-peak width is 39 nm;
a shell, cadmium telluride aqueous phase quantum dots, a luminous position of 535nm and a half-peak width of 36 nm;
the product has a luminescent position of 694nm and a half-peak width of 80 nm;
the proportion of the core shell is 1:0.3 of the content ratio of cadmium element in the core solution to the shell solution;
a heating mode, a hydrothermal method;
the heating temperature is 110 ℃;
heating time, 6 hours.
Secondly, aiming at the long-luminescence wavelength cadmium selenide aqueous phase quantum dots, the specific implementation is as follows:
the core is cadmium selenide water-phase quantum dots, the light-emitting position is 565nm, and the half-peak width is 32 nm;
a shell, cadmium selenide water-phase quantum dots, a light-emitting position of 508nm and a half-peak width of 28 nm;
the proportion of the core to the shell is 1:1, wherein the content ratio of cadmium elements in the core solution to the shell solution is 1: 1;
the product has a luminescence position of 614nm and a half-peak width of 34 nm;
a heating mode, a hydrothermal method;
the heating temperature is 110 ℃;
heating time, 4 hours.
Thirdly, aiming at the water phase quantum dots with the long-luminous-wavelength cadmium telluride-cadmium selenide core-shell structure, the specific implementation is as follows:
the core is a cadmium telluride aqueous phase quantum dot, the light-emitting position is 614nm, and the half-peak width is 50 nm;
the shell is made of cadmium selenide aqueous phase quantum dots, the light emitting position is 522nm, and the half-peak width is 33 nm;
the proportion of the core and the shell is 1: 0.5;
the product has a luminescence position of 740nm and a half-peak width of 82 nm;
a heating mode, a hydrothermal method;
the heating temperature is 110 ℃;
heating time, 6 hours.
Fourthly, aiming at the water phase quantum dots with the long-luminous-wavelength cadmium telluride-cadmium selenide core-shell structure, the specific implementation is as follows:
the core is a cadmium telluride aqueous phase quantum dot, the light-emitting position is 614nm, and the half-peak width is 50 nm;
the shell is a mixed solution of three solutions of cadmium acetate, thioglycollic acid and sodium selenide, wherein the sodium selenide solution is obtained by reacting selenium powder with sodium borohydride, and the molar ratio of the cadmium acetate to the thioglycollic acid to the sodium selenide is 1:2.1:0.25 during mixing;
the proportion of the core and the shell is 1: 0.5;
the product has the luminous position of 720nm and the half-peak width of 83 nm;
the heating mode is normal pressure heating;
heating temperature, 96 ℃;
heating time, 14 hours.
Fifthly, aiming at the long-luminescence wavelength cadmium selenide-cadmium sulfide core-shell structure water phase quantum dot, the specific implementation is as follows:
the core is cadmium selenide water-phase quantum dots, the light-emitting position is 535nm, and the half-peak width is 30 nm;
the shell is mixed with a mixed solution of three solutions of cadmium acetate, thioglycollic acid and sodium sulfide, and the molar ratio of the cadmium acetate to the thioglycollic acid to the sodium sulfide is 1:2.1: 0.2;
the proportion of the core to the shell is 1:1, wherein the content ratio of cadmium elements in the core solution to the shell solution is 1: 1;
the product has a luminescence position of 603nm and a half-peak width of 35 nm;
the heating mode is high-pressure heating, and the pressure is 100 MPa;
the heating temperature is 97 ℃;
heating time, 15 minutes.
The implementation principle of the invention is as follows: the size of the quantum dots is in nanometer level, and in nanometer level, when particles with different sizes, which are made of the same material, are in solution at the same time, the solubility of the particles with smaller sizes is larger, and the solubility of the particles with larger sizes is smaller. Thus, when the particles made of the same material are in a uniform solution system at the same time in different sizes, the particles with smaller sizes are gradually dissolved, and the dissolved material is deposited and grows on the particles with larger sizes; the invention utilizes the principle to mix quantum dots with different sizes and made of the same material, heat and react for a certain time to prepare the quantum dots with larger grain diameter and longer light-emitting wavelength.
In general, in the method of preparing an aqueous phase quantum dot having a long emission wavelength, a method of extending a reaction time or adding a substance containing an element constituting a quantum dot material to an initial quantum dot solution is employed. For example, in the preparation of aqueous phase cadmium selenide quantum dots with longer luminescence wavelength, excess cadmium is usually already contained in the solution of cadmium selenide quantum dots with shorter luminescence wavelength, and a certain amount of solution containing selenium ions is added. In the method of the invention, the cadmium selenide quantum dot aqueous solution with shorter luminescence wavelength is added.
Generally, an aqueous solution of cadmium selenide quantum dots requires mixing an aqueous solution containing cadmium ions and selenium ions, and heating the mixture in boiling water for a certain period of time at a certain temperature. In the process described in the present invention, however, it is possible to use directly the mixture containing the aqueous solution of cadmium ions and selenium ions.
The method described herein can be used to prepare single-material quantum dots with longer luminescence wavelength, and also can be used to prepare core-shell structure quantum dots. For example, the quantum dots with cadmium selenide/cadmium sulfide core-shell structures are prepared, namely the quantum dots with cadmium selenide as a core and cadmium sulfide as a shell. The common method is to add sulfide ions into the aqueous solution of cadmium selenide quantum dots, and at this time, the solution already contains excessive cadmium. By adopting the method, the cadmium sulfide quantum dots are added into the aqueous solution of the cadmium selenide quantum dots. The preparation of the cadmium selenide/cadmium sulfide core-shell structure quantum dot can use a mixture containing cadmium ions and selenium ions aqueous solution.
The method described in the invention is also applicable in the preparation of oil phase quantum dots.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.

Claims (9)

1. The preparation method of the long-luminescence-wavelength aqueous phase quantum dot is characterized by comprising the following steps of:
the method comprises the following steps: setting a core solution and a plurality of shell solutions;
the core solution and the shell solution are quantum dot solutions with specified light-emitting wavelengths, the light-emitting wavelength of the core solution is longer than that of the shell solution, and the difference value of the light-emitting wavelengths of the core solution and the shell solution is 40-110 nm;
step two: mixing the core solution and the shell solution to obtain a water-phase quantum dot mixed solution;
step three: and heating the water phase quantum dot mixed solution, and reacting for a specified time to obtain the required long-wavelength luminescent water phase quantum dot.
2. The method for preparing the long-luminescence-wavelength aqueous quantum dot according to claim 1, wherein the core solution and the shell solution are the same substance solution; when the cadmium telluride aqueous phase quantum dot solution is prepared, the core solution is the cadmium telluride aqueous phase quantum dot solution with the luminescent wavelength of 590-630 nm; the shell solution is one or a mixture of more cadmium telluride aqueous phase quantum dot solutions with the luminescent wavelength of 520-570 nm.
3. The method for preparing the long-luminescence-wavelength aqueous quantum dot according to claim 1, wherein the core solution and the shell solution are the same substance solution; when the cadmium selenide aqueous phase quantum dot solution is prepared, the nuclear solution is the cadmium selenide aqueous phase quantum dot solution with the luminescent wavelength of 530-580 nm; the shell solution is one or a mixture of several cadmium selenide aqueous phase quantum dot solutions with the luminescence wavelength of 490-530 nm.
4. The method for preparing long-luminescence-wavelength aqueous quantum dots according to claim 1, wherein the ratio of the amount of cadmium elements in the core solution to the amount of cadmium elements in the shell solution in the core solution is in the range of 1:0.3 to 1: 7.
5. The method for preparing the long-luminescence-wavelength aqueous phase quantum dots according to claim 1, wherein the aqueous phase quantum dot mixed solution is heated in the third step, and the heating method comprises normal pressure heating and high pressure heating.
6. The method for preparing the long-luminescence-wavelength aqueous phase quantum dots, according to claim 5, is characterized in that in the normal-pressure heating reaction, the heating temperature is set in boiling water at 55-99 ℃; the heating time is controlled to be 1-16 hours.
7. The preparation method of the long-luminescence-wavelength aqueous-phase quantum dot according to claim 5, wherein a hydrothermal method is specifically adopted in the high-pressure heating reaction, and the hydrothermal method specifically comprises the following steps:
the method comprises the following steps: placing the reaction solution in a high-pressure reaction kettle;
step two: heating the high-pressure reaction kettle at a heating temperature higher than the boiling point of water;
at this time, the pressure of the high-pressure heating reaction is determined by the heating temperature; the heating temperature is controlled between 103 ℃ and 240 ℃; the heating time is controlled to be 30 minutes to 10 hours.
8. The preparation method of the long-luminescence-wavelength aqueous phase quantum dot according to claim 5, wherein the water high-pressure heating reaction is realized by an HP301-450 ultrahigh-pressure reaction device, the heating temperature is set to 70-350 ℃, and the heating time is set to 3-180 minutes.
9. The preparation method of the long-luminescence-wavelength aqueous quantum dot according to claim 1, wherein the core solution and the shell solution are different substance solutions, the core solution and the shell solution form a core-shell structure, and the core-shell structure is a core solution-shell solution; the core-shell structure comprises cadmium telluride-cadmium selenide, cadmium telluride-cadmium sulfide, cadmium selenide-zinc selenide, cadmium selenide-zinc sulfide and cadmium sulfide-zinc sulfide.
CN202010451360.9A 2020-05-25 2020-05-25 Preparation method of long-luminescence wavelength water-phase quantum dots Pending CN111518541A (en)

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Application publication date: 20200811