WO2020073926A1 - 量子点的制备方法 - Google Patents
量子点的制备方法 Download PDFInfo
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Definitions
- the present application relates to the technical field of nanocrystalline material preparation, in particular to a method for preparing quantum dots.
- Nanoscience and nanotechnology is an emerging science and technology and has potential application value and economic benefits, so it has attracted the attention of scientists worldwide.
- NCs nanocrystals
- Semiconductor nanocrystals also known as quantum dots (QDs)
- QDs quantum dots
- QDs quantum dots
- the bandgap and conduction bands of semiconductor nanocrystals also change (quantum size effect), such as The absorption and emission of CdSe nanocrystals cover almost the entire visible spectrum range. Therefore, semiconductor nanocrystals exhibit a size-related photoluminescence property.
- Semiconductor nanocrystals have been used in many technical fields such as biomarkers, diagnostics, chemical sensors, light-emitting diodes, electroluminescent devices, photovoltaic devices, lasers, and electronic transistors. However, for applications in different technical fields, it is necessary to prepare different types of semiconductor quantum dots. The preparation of high-quality semiconductor quantum dots is a prerequisite for the effective application of semiconductor quantum dot size effects.
- the two-step method means that the preparation of core-shell quantum dots includes two steps: a long core is carried out in a reaction vessel, and the quantum dot core is taken out and placed in another reaction solvent for long shells.
- the three-step method refers to the preparation of core-shell quantum dots including two steps: a reaction vessel for long cores, the quantum dot cores are taken out and placed in another reaction solvent for intermediate shell growth, and the containing The inter-shell core-shell quantum dots are placed in the third reaction vessel for outermost shell growth.
- the shell growth method used to prepare the core-shell structure quantum dots is generally simply using a shell source precursor for continuous injection growth.
- This method cannot control the growth quality of the shell layer well, resulting in a core-shell structure quantum dot with less surface ligands, resulting in poor solubility. Therefore, it is of great significance to study the growth method of core-shell quantum dot shell and the control of shell growth.
- One of the purposes of the embodiments of the present application is to provide a method for preparing quantum dots, aiming to solve the core-shell structure quantum dots prepared by the continuous injection growth method of the shell source precursor in the prior art, and the surface is equipped with
- the problem is that the volume is small and the solubility is not good, or the purpose is to solve the core-shell structure quantum dots prepared by the continuous injection growth method of the shell source precursor in the current technology, the lattice stress is large, and the surface has many lattice defects, which affects The fluorescence intensity.
- a method for preparing a core-shell structure quantum dot including the following steps:
- the solution system is mixed with a mixed solution of an organic amine and an organic phosphine and heated; [0013] or includes the following steps:
- the solution system is mixed with a mixed solution of organic carboxylic acid and organic phosphine and heated
- the beneficial effects of the method for preparing quantum dots are as follows: the initial quantum dot core is mixed with an organic carboxylic acid, and the organic carboxylic acid tends to bind to the surface of the initial quantum dot core cation to make organic Carboxylic acid is bound to the surface of the initial quantum dot core, used to fill the cation vacancy of the quantum dot core, reduce the defect state between the core and shell interface, and provide a good epitaxial interface for the growth of the shell layer.
- the organic carboxylic acid can also have the effect of passivating the surface of the quantum dot core, so that the quantum dot core will not self-mature in the stage of heating up to the temperature of the long shell, thereby obtaining quantum dots with uniform particle size.
- the organic ligands after pyrolysis of the shell-source anion precursor and shell-source cation precursor are combined with the organic carboxylic acid in the shell growth reaction system to the shell surface, resulting in the prepared core-shell structure Quantum dots have good monodispersity.
- the system after the shell growth reaction is completed is further mixed with at least one of an organic phosphine and / or an organic amine for subsequent processing, wherein, when the shell growth reaction is completed, the system and the organic phosphine When mixing for subsequent treatment, the organic phosphine combines with the non-metallic elements on the surface of the nanocrystalline shell layer to passivate the anion vacancies, reduce the defect states on the surface of the core-shell nanocrystals, and further increase the fluorescence intensity of the core-shell structure quantum dots;
- the system is mixed with an organic amine for subsequent processing, and the organic amine can complex with the residual cationic precursor in the core-shell structure quantum dot mixture, which reduces the freezing point of the cationic precursor, which is beneficial to subsequent
- the cleaning and purity of quantum dots make the prepared quantum dots can effectively avoid the impact of residual cationic precursor impurities in the core-shell structure quantum dot solution on the stability of the device when used to form a device film
- the organic amine is bonded to the surface of the initial quantum dot core, used to fill the cation vacancy of the initial quantum dot core, and reduce the defect state between the core-shell interface , To provide a good epitaxial interface for the growth of the shell. Further, since the binding force between the organic amine and the metal atoms on the surface of the quantum dot core is relatively weak, the organic amine requires less energy to desorb from the metal atoms on the surface of the previous shell.
- the anions in the shell-source precursor are easier to combine with the metal ions in the core surface for epitaxial growth, which can avoid the atoms at the interface between the quantum dot core and the shell
- the lattice stress is relatively large, which reduces lattice defects on the surface of the epitaxial crystallized shell.
- the growth of the shell layer according to the crystal orientation of the quantum dot core during the epitaxial crystallization is driven, so that the shell layer obtained by the shell growth is consistent with the crystal form of the quantum dot core, further reducing the quantum dot Lattice defects between atoms on the core surface and the shell.
- the system after the completion of the shell layer growth reaction is further mixed with at least one of organic phosphine and / or organic carboxylic acid for subsequent processing, wherein, when the system after the shell layer growth reaction is completed is combined with the organic
- the organic phosphine is mixed for subsequent treatment, the organic phosphine is combined with the non-metallic elements on the surface of the nanocrystalline shell layer to passivate the anion vacancy, reduce the defect state on the surface of the core-shell nanocrystals, and further increase the fluorescence intensity of the core-shell structure quantum dots;
- the organic carboxylic acid can effectively eliminate the protonated organic amine connected to the surface of the core-shell structure nanocrystalline shell (the organic amine is used to modify the quantum dot core During the process, part of the organic amines fall off and bind to the surface of the growing metal atoms in the subsequent long shell process.
- FIG. 1 is a schematic flow chart of a method for preparing a core-shell structure quantum dot provided by an embodiment of the present application
- FIG. 2 is a schematic flow chart of a method for preparing a core-shell structure quantum dot provided by another embodiment of the present application.
- first and second are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the indicated technical features quantity.
- the features defined as “first” and “second” may explicitly or implicitly include one or more of the features.
- the meaning of “plurality” is two or more, unless otherwise specifically limited.
- an embodiment of the present application provides a method for preparing a core-shell structure quantum dot, including the following steps:
- S01 provides an initial quantum dot core, the initial quantum dot core is mixed with an organic carboxylic acid, the organic carboxylic acid is bonded to the surface of the initial quantum dot core;
- S02 preparing a shell layer on the surface of the initial quantum dot core, wherein the step of preparing a shell layer on the surface of the initial quantum dot core is carried out in a shell growth reaction system containing organic carboxylic acid;
- the solution system is mixed with a mixed solution of an organic amine and an organic phosphine and heated.
- the method for preparing quantum dots mixes the initial quantum dot core with an organic carboxylic acid, and the organic carboxylic acid tends to bind to the surface of the initial quantum dot core cation to bind the organic carboxylic acid to
- the surface of the initial quantum dot core is used to fill the cation vacancy of the quantum dot core, reduce the defect state between the core-shell interface, and provide a good epitaxial interface for the growth of the shell layer.
- the organic carboxylic acid can also achieve the effect of passivating the surface of the quantum dot core, so that the quantum dot core will not self-mature at the stage of heating up to the temperature of the long shell, thereby obtaining quantum dots with uniform particle size.
- the organic ligands after pyrolysis of the shell-source anion precursor and shell-source cation precursor are combined with the organic carboxylic acid in the shell growth reaction system to the shell surface, resulting in the prepared core-shell structure Quantum dots have good monodispersity.
- the system after the completion of the shell layer growth reaction is continuously mixed with at least one of organic phosphine and / or organic amine for subsequent processing, wherein, when the system after the shell layer growth reaction is completed With When organic phosphine is mixed for subsequent treatment, the organic phosphine is combined with the non-metallic elements on the surface of the nanocrystalline shell layer to passivate anion vacancies, reduce the defect state on the surface of the core-shell nanocrystals, and further increase the fluorescence intensity of the core-shell structure quantum dots;
- the organic amine can complex with the residual cationic precursor in the mixed liquid of the core-shell structure quantum dots, which lowers the freezing point of the cationic precursor, which is beneficial to Subsequent cleaning and purity of the quantum dots make the prepared quantum dots effectively avoid the influence of the residual cationic precursor impurities in the core-shell structure quantum dot solution on the stability
- the initial quantum dot nuclei may be selected from group II / VI quantum dot nuclei, group III / V quantum dot nuclei, m / vi group quantum dot nuclei and At least one of the imn / vi family quantum dot cores, but not limited to this.
- the group II / VI quantum dot core may be selected from CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, HgS, HgSe, HgTe, CdZnSe, CdSSe, ZnSSe, ZnCdS, ZnCdS e, ZnSeS, ZnCdTe, ZnCdSSe, ZnCdSeS and ZnCdTeS, but not limited to this; the III / V group quantum dot core may be selected from InAs, InP, GaAs, GaP, GaSb,
- the IIFVI group quantum dot core is selected from InS, In 2 S 3 ′ InSe, In 2 Se 3 , In 4 Se 3 , In 2 Se 3 , InTe, In 2 Se 3 , GaS, Ga 2 Se 3 , GaSe, Ga 2 Se 3 , GaTe, Ga 2 Te 3 , but not limited to this; the II / III / VI group quantum dot nuclear sorting From CuInS, CuInZnS and CuInSeS, but not limited to this.
- the initial quantum dot core may be selected from group II / VI quantum dot cores.
- the initial quantum dot core is an initial quantum dot core containing surface ligands.
- the surface ligand is selected from at least one of an organic carboxylic acid ligand, an organic phosphonic acid ligand, an organic phosphine ligand, and a phosphine oxide ligand.
- the organic carboxylic acid ligand is preferably selected from but not limited to at least one of oleic acid, myristic acid, and dodecanoic acid;
- the organic phosphonic acid ligand is preferably selected from but not limited to ten At least one of octaalkylphosphonic acid, tetradecylphosphonic acid, and dodecyl;
- the organic phosphine ligand is preferably selected from but not limited to at least one of trioctylphosphine and tributylphosphine;
- the phosphine oxide ligand is preferably selected from but not limited to at least one of trioctylphosphine oxide and tributylphosphine oxide.
- the initial quantum dot core is mixed with an organic carboxylic acid
- the organic carboxylic acid tends to bind to the initial quantum dot core cation surface, so that the organic carboxylic acid is bound to the initial quantum dot core surface, It is used to fill the cation vacancy of the quantum dot core, reduce the defect state between the core and shell interface, and provide a good epitaxial interface for the growth of the shell layer.
- the organic carboxylic acid can also have the effect of passivating the surface of the quantum dot core, so that the quantum dot core will not self-mature at the stage of heating up to the temperature of the long shell, thereby obtaining quantum dots with uniform particle size.
- the organic ligands after pyrolysis of the shell-source anion precursor and shell-source cation precursor are combined with the organic carboxylic acid in the shell growth reaction system to the shell surface, resulting in the prepared core-shell structure Quantum dots have good monodispersity.
- the organic carboxylic acid is selected from organic carboxylic acids having 8 to 18 carbon atoms, and at this time, has a relatively small steric hindrance, which facilitates the binding of the organic carboxylic acid to the initial quantum Point nuclear surface.
- the organic carboxylic acid is selected from a linear organic carboxylic acid containing a single carboxyl group.
- the linear organic carboxylic acid is beneficial to reduce steric hindrance and promote the occurrence of passivation.
- the organic carboxylic acid may be at least one selected from oleic acid, dodecanoic acid, myristic acid, hexadecanoic acid, and octadecanoic acid.
- the step of mixing the initial quantum dot core with the organic carboxylic acid is: mixing the initial initial quantum dot core with the organic carboxylic acid, heating at a temperature of 80-150 ° C for 20-60 minutes, so that the organic carboxylic acid is bonded to the surface of the initial quantum dot core.
- the initial quantum dot core is configured such that a solution is mixed with the organic carboxylic acid.
- the initial quantum dot nuclei in order to make the initial quantum dot nuclei uniformly dispersed in the solvent (the initial quantum dot nuclei are individually present in the solution and maintain a proper distance from each other), it provides good for shell growth on the surface of the initial quantum dot nuclei Conditions, to obtain a shell layer with good dispersion and uniform thickness, in the initial quantum dot core solution, the volume ratio of the mass of the initial quantum dot core to the solvent is 10 mg : (5 ⁇ 1
- the mass molar ratio of the quantum dot core to the organic acid is 10 mg: (3 ⁇ 10mmol)
- step S02 Dispersing the initial quantum dot nuclei into a solution containing the organic carboxylic acid, and performing surface modification treatment on the initial quantum dot nuclei.
- the organic carboxylic acid reagent may be present in a certain excess, but the organic carboxylic acid reagent may not Too much excess, otherwise the viscosity is too large, will affect the subsequent long shell rate, which is not conducive to the formation of the shell.
- step S02 the step of preparing a shell layer on the surface of the initial initial quantum dot core is performed in a shell growth reaction system containing organic carboxylic acid.
- the organic carboxylic acid in the shell growth reaction system is derived from step S01, that is, the initial initial quantum dot core and Organic carboxylic acid is mixed to combine the organic carboxylic acid to the remaining organic carboxylic acid in the step of the initial initial quantum dot core surface; when the organic carboxylic acid added in step S 01 is not excessive, or, although the added in step S01 Excessive amount of organic carboxylic acid, but as the growth of the shell layer progresses, when the organic carboxylic acid is insufficient, it is also possible to add an appropriate amount of organic carboxylic acid to the shell growth reaction system during the preparation of the shell layer on the surface of the initial quantum dot core So that a sufficient amount of carboxylic acid is bound to the surface of the growing shell, so that the prepared quantum dots have good monodispersity.
- shell-source anion precursors such as complex precursors formed by non-metallic elements such as Te, Se, S, P and oleic acid
- shell-source cationic precursors oil Zinc acid, cadmium oleate, etc.
- the organic carboxylic acid in the reaction system of shell growth containing organic carboxylic acid is derived from the
- the initial quantum dot core is mixed with an organic carboxylic acid to combine the organic carboxylic acid to the organic carboxylic acid remaining in the step of the surface of the initial quantum dot core, and / or to supplement the shell growth reaction system during the shell growth process Add an appropriate amount of organic carboxylic acid.
- the shell growth reaction system refers to a reaction material system applied in the process of shell growth on the surface of the initial initial quantum dot core; examples of the present application In which, the shell source precursor can be injected once into the solution containing the initial quantum dot core for one shell growth; in yet another embodiment of the present application, the shell source precursor can be injected multiple times to contain the initial quantum dot In the core solution or the solution system in which the shell layer grows, multiple shell layers are grown.
- a shell source precursor is added to the initial quantum dot core for the first shell growth to prepare a first shell layer; further, on the basis of the first shell layer, a shell source precursor is added
- the second shell growth is performed on the body, and a second shell layer is prepared on the surface of the first shell layer; in this manner, the N-th shell layer is prepared through N shell growths.
- the surface of each shell layer is combined with the organic carboxylic acid in the shell growth reaction system and the organic ligand after pyrolysis of the shell-source anion precursor and shell-source cation precursor, so that the preparation After each shell layer is obtained, the material has a good monodispersity, which is beneficial for subsequent shell layer growth or better dispersion performance as a product application.
- the shell source precursor includes a shell source cationic precursor and a shell source anion precursor.
- the shell-source cation precursor is at least one of organic metal carboxylates formed from oxides or metal salts of metals such as Cd, Zn, Pb, Ag, Hg, Fe, In, A1, and organic carboxylic acids .
- the shell-source cation precursor is selected from zinc oleate, lead oleate, silver oleate, mercury oleate, indium oleate, copper oleate, iron oleate, manganese oleate, aluminum oleate, stearin Zinc acid, lead stearate, silver stearate, mercury stearate, indium stearate, copper stearate, iron stearate, manganese stearate, aluminum stearate, zinc tetradecanoate, ten Lead tetradecanoate, silver tetradecanoate, mercury tetradecanoate, indium tetradecanoate, copper tetradecanoate, iron tetradecanoate, manganese tetradecanoate, aluminum tetradecanoate, hexadecane Zinc acid, lead cetate, silver cetate, mercury cetate, indium cetate, copper cetate, iron cetate, manganese Zinc
- the shell-source anion precursor is prepared.
- the organic molecule is selected from trioctylphosphine, tributylphosphine, oleic acid, and At least one of octaene, but not limited to this.
- the organic molecule of the non-metallic atom is an organic molecule containing a single functional group mercapto (-HS) functional group (eg, octadecanethiol, heptadecanethiol, (Cetanethiol, pentathiol, tetradecanethiol, tridecanethiol, dodecanethiol, octathiol, etc. are not limited to this).
- -HS mercapto
- the selection of the shell source is not limited, in some embodiments, it should be satisfied that the band gap of the obtained shell layer is larger than the band gap of the initial quantum dot core.
- the shell-source cationic precursor is selected from at least one of organometallic carboxylates of Cd, Zn, and Pb, and the shell-source anion precursor is selected from An anion complex or thiol formed by dispersing Te, Se, and S in organic molecules.
- the shell source is a mixed precursor solution in which a shell cationic precursor and a shell anion precursor are dispersed; the method of adding the shell source may be: injecting the cationic precursor and the anionic precursor into a solvent to configure The cationic precursor solution and the anionic precursor solution are first injected into the shell cationic precursor solution and then into the shell anionic precursor solution; or, the cationic precursor and the anionic precursor are injected into the solvent separately to configure the cationic precursor solution and the anionic precursor Body solution, first inject the shell anion precursor solution and then the shell cationic precursor solution; or, inject the cationic precursor and the anionic precursor into the solvent to obtain a mixed solution containing the cationic precursor and the anionic precursor, and mix the mixed solution Inject into the solution system containing the initial quantum dot core or the shell growth
- the concentration range of the shell source cationic precursor solution is (0.5-1.5mmol / ml); the concentration range of the shell source anion precursor solution is (0.5 ⁇ 1.5mmol / ml)
- the proper concentration is conducive to uniformly combining the shell-source cationic precursor and the shell-source anion precursor on the surface of the initial quantum dot core, and forming a uniform and stable shell layer by crystallization.
- the mass ratio of the shell source cationic precursor to the initial quantum dot core is (l ⁇ 1.5mmol): 10mg, and / or the shell source anion precursor and the The mass ratio of the initial quantum dot core is (1-1.5 mmol): 10 mg, and the shell source precursor is injected into the solution system containing the initial quantum dot core or the shell layer growth.
- This method is conducive to uniformly and stably binding the anion precursor and the cationic precursor on the surface of the initial quantum dot core, and obtaining a shell layer with an appropriate thickness.
- the temperature at which the shell layer is prepared on the surface of the initial quantum dot core after the modification treatment is 150 to 320 ° C. Within this temperature range, it is conducive to the crystallization of the anion-cation precursor into a shell, and it will not Affect the stability of quantum dots.
- step S03 in an embodiment, the solution system after the shell growth reaction is completed is mixed with an organic phosphine to combine the organic phosphine with the non-metallic atoms on the surface of the quantum dot shell to reduce The defect states on the surface of the core-shell nanocrystals further increase the fluorescence intensity of the core-shell structure quantum dots.
- the solution system after the shell growth reaction is completed is mixed with an organic phosphine, and heated at a temperature of 100-320 ° C for 10-60 min under the conditions
- the organic phosphine is combined with non-metal atoms on the surface of the quantum dot shell layer to reduce the defect state on the surface of the core-shell nanocrystals and further increase the fluorescence intensity of the core-shell structure quantum dots.
- the organic phosphine dissolves after the shell growth reaction is completed If the temperature of the mixed treatment in the liquid system is too low and / or the time is too short, the effect of the organic phosphine to passivate the anion vacancy is not obvious, and even the passivation effect cannot be exerted, and thus the fluorescence intensity of the core-shell structure nanocrystals cannot be improved; if the organic phosphine The temperature of mixing treatment with the solution system after the completion of the shell growth reaction is too high, not only the organic phosphine is easily volatilized, affecting the modification treatment effect, but also the high temperature conditions will affect the structural stability of the core-shell structure nanocrystal itself.
- step S03 in the step of mixing and heating the system after the completion of the shell growth reaction with the organic phosphine, in some embodiments, according to the molar mass ratio of the organic phosphine to the initial quantum dot core (2 ⁇ 5 mmol): 10 mg, disperse the core-shell structure quantum dots into a solution containing organic phosphine. If the content of the organic phosphine is too low, the effect of passivating anion vacancies is not obvious, and it is difficult to significantly increase the fluorescence intensity of the quantum point of the core-shell structure. If the content of the organic phosphine is too high, it will affect the film-forming performance of the core-shell structure nanocrystals when preparing the film layer.
- step S03 in one embodiment, the system after the shell growth reaction is completed is mixed with an organic amine, so that the organic amine can be combined with the shell source cations remaining in the solution system after the shell growth reaction is completed.
- the precursor complexes thereby reducing the freezing point of the shell source cationic precursor remaining in the solution system, which is beneficial to the subsequent cleaning of the quantum dot mixture and the improvement of purity, so that the prepared quantum dots are used to form device films
- the layer is formed, the influence of residual cationic precursor impurities in the core-shell structure quantum dot solution on the device stability can be effectively avoided, and the film formation quality of the quantum dot solid film can be improved.
- the solution system after the shell growth reaction is completed is mixed with an organic amine, and heated at a temperature of 80-320 ° C for 10-60 min. Under the conditions, the organic amine combines with the non-metal atoms on the surface of the quantum dot shell to reduce the freezing point of the shell-source cation precursor remaining in the solution system, thereby improving the purity of the core-shell structure quantum dot.
- the mixing temperature of the solution system and the organic amine after the shell growth reaction is too low and / or the time is too short, the effect of the organic amine to complex the remaining cationic precursor is not obvious, and the purity of the core-shell structure quantum dots cannot be improved ; If the temperature is too high and / or the time is too long, the high temperature conditions will affect the structural stability of the core-shell structure quantum dots, such as ligand shedding.
- step S03 in the step of mixing the system after the shell growth reaction is completed with an organic amine to bond the organic amine to the surface of the shell, in some embodiments, according to the organic amine
- the molar mass ratio with the initial quantum dot core is (5 ⁇ 10mmol): 10mg, disperse the core-shell structure quantum dots to There are organic amines in solution. If the content of the organic amine is too low, the effect of improving the purity of the core-shell structure quantum dots is not obvious. If the content of the organic amine is too high, the organic amine remaining after complexing with the residual cationic precursor in the mixed liquid of the core-shell structure quantum dots will exchange with the ligand on the surface of the core-shell structure quantum dots.
- the amine ligand itself is unstable (the exchanged organic carboxylic acid is removed in the cleaning process), and it is easy to fall off. Therefore, defects will be introduced at the falling position, which reduces the photothermal stability, fluorescence intensity and solubility of the core-shell structure quantum dots.
- the organic amine used as a post-treatment reagent is an organic amine having 8 to 18 carbon atoms.
- the organic amine reagent is selected from linear organic amines containing a single amino group.
- the linear organic amines are beneficial for reducing steric hindrance and promoting organic amine binding to the surface of the shell layer.
- the organic amine reagent may be at least one selected from oleylamine, trioctylamine, dodecylamine, tetradecylamine, hexadecylamine, and octadecylamine.
- step S03 in an embodiment, the solution system after the completion of the shell growth reaction is mixed with a mixed solution of an organic amine and an organic phosphine to make the organic phosphine, the organic amine and the quantum dot shell
- the non-metallic atoms on the surface combine to increase the fluorescence intensity and purity of the core-shell structure quantum dots.
- the solution system after the completion of the shell growth reaction is mixed with a mixed solution of an organic amine and an organic phosphine, and heated at a temperature of 80-320 ° C. -90min. Under the conditions, the organic amine and the organic phosphine are combined with the non-metal atoms on the surface of the quantum dot shell layer to improve the purity and fluorescence intensity of the core-shell structure quantum dot.
- the mixing temperature of the solution system after the shell growth reaction and the mixed solution of the organic amine and the organic phosphine is too low and / or the time is too short, the effect of the organic amine and the organic phosphine to complex the remaining cation precursor is not obvious, and The purity and fluorescence intensity of the core-shell structure quantum dots cannot be improved; if the temperature is too high and / or the time is too long, the high temperature conditions will affect the structural stability of the core-shell structure quantum dots themselves, such as ligand shedding.
- step S03 in the step of mixing and heating the solution system with the mixed solution of the organic amine and the organic phosphine after the shell growth reaction is completed, according to the molar mass ratio of the organic amine to the initial quantum dot core Is (5-10 mmol): 10 mg, the molar mass ratio of the organic phosphine to the initial quantum dot core is (2 ⁇ 5 mmol): 10 mg, and the solution system after completion of the shell growth reaction with organic amine and organic phosphine The mixed solution is mixed.
- the influence of the content of the organic phosphine and organic amine is as described above.
- an embodiment of the present application provides a method for manufacturing a quantum dot core-shell structure nanocrystal
- the preparation method includes the following steps:
- E01 provides an initial quantum dot core, mixing the initial quantum dot core with an organic amine, so that the organic amine is bonded to the surface of the initial quantum dot core;
- E02 a shell growth reaction is performed on the surface of the initial quantum dot core to prepare a shell
- the solution system is mixed with a mixed solution of organic carboxylic acid and organic phosphine and heated
- the method for preparing quantum dots mixes the initial quantum dot core with an organic amine, and the organic amine is bonded to the surface of the initial quantum dot core to fill the cation of the initial quantum dot core Vacancy reduces the defect state between the core-shell interface and provides a good epitaxial interface for the growth of the shell. Further, since the binding force between the organic amine and the metal atoms on the surface of the quantum dot core is relatively weak, the organic amine requires less energy to desorb from the metal atoms on the surface of the previous shell.
- the anions in the shell source precursor are easier to combine with the metal ions in the core surface for epitaxial growth, which can avoid the larger lattice stress between the atoms at the interface between the quantum dot core and the shell layer, reducing the presence of a lattice on the surface of the shell layer of the epitaxial crystallization defect.
- the growth of the shell layer according to the crystal orientation of the quantum dot core during the epitaxial crystallization is driven, so that the shell layer obtained by the shell growth is consistent with the crystal form of the quantum dot core, further reducing the quantum dot Lattice defects between atoms on the core surface and the shell.
- the system after the completion of the shell layer growth reaction continues to be mixed with at least one of organic phosphine and / or organic carboxylic acid for subsequent processing, wherein, when the shell layer growth reaction is completed
- the organic phosphine is combined with the non-metallic elements on the surface of the nanocrystalline shell layer to passivate anion vacancies, reduce the defect state on the surface of the core-shell nanocrystals, and further increase the fluorescence intensity of the core-shell structure quantum dots ;
- the organic carboxylic acid can effectively eliminate the protonated organic amine connected to the surface of the core-shell structure nanocrystalline shell layer (using organic amine to the quantum dot core During the modification process, part of the organic amines fall off and bind to the surface of the growing metal atoms in the subsequent long shell process.
- the initial quantum dot nuclei may be selected from group II / VI quantum dot nuclei, group III / V quantum dot nuclei, m / vi group quantum dot nuclei and At least one of the imn / vi family quantum dot cores, but not limited to this.
- the group II / VI quantum dot core may be selected from CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, HgS, HgSe, HgTe, CdZnSe, CdSSe, ZnSSe, ZnCdS, ZnCdS e, ZnSeS, ZnCdTe, ZnCdSSe, ZnCdSeS and ZnCdTeS, but not limited to this; the III / V group quantum dot core may be selected from InAs, InP, GaAs, GaP, GaSb,
- the IIFVI group quantum dot core is selected from InS, In 2 S 3 ′ InSe, In 2 Se 3 , In 4 Se 3 , In 2 Se 3 , InTe, In 2 Se 3 , GaS, Ga 2 Se 3 , GaSe, Ga 2 Se 3 , GaTe, Ga 2 Te 3 , but not limited to this; the II / III / VI group quantum dot nuclear sorting From CuInS, CuInZnS and CuInSeS, but not limited to this.
- the initial quantum dot core may be selected from group II / VI quantum dot cores.
- the initial quantum dot core is an initial quantum dot core containing surface ligands.
- the surface ligand is selected from at least one of an organic carboxylic acid ligand, an organic phosphonic acid ligand, an organic phosphine ligand, and a phosphine oxide ligand.
- the organic carboxylic acid ligand is preferably selected from but not limited to at least one of oleic acid, myristic acid, and dodecanoic acid;
- the organic phosphonic acid ligand is preferably selected from but not limited to ten At least one of octaalkylphosphonic acid, tetradecylphosphonic acid, and dodecyl;
- the organic phosphine ligand is preferably selected from but not limited to at least one of trioctylphosphine and tributylphosphine;
- the phosphine oxide ligand is preferably selected from but not limited to at least one of trioctylphosphine oxide and tributylphosphine oxide.
- the initial quantum dot core is mixed with an organic amine, the organic amine tends to bind to the surface of the initial quantum dot core cation, so that the organic amine is bound to the surface of the initial quantum dot core, with In order to fill the cation vacancy of the initial quantum dot core, reduce the defect state between the core and shell interface, and reduce the existence of lattice defects on the surface of the epitaxially crystallized shell layer.
- the organic amine is selected from organic amines having 8 to 18 carbon atoms, and at this time, has a relatively small steric hindrance, which facilitates the binding of the organic amine to the surface of the initial quantum dot core .
- the organic amine is selected from linear organic amines containing a single amino group. Hinder and promote the occurrence of modification.
- the organic amine reagent may be selected from at least one of oleylamine, trioctylamine, dodecylamine, tetradecylamine, hexadecylamine, and octadecylamine.
- the initial quantum dot core in order to facilitate the organic amine to be stably bound to the surface of the initial quantum dot core, is mixed with the organic amine
- the mixing conditions are: mixing the initial initial quantum dot core with an organic amine, and under the condition of a temperature of 80-150 ° C for 20-60 minutes, the organic amine is bound to the initial quantum dot core surface.
- the initial quantum dot core is configured such that a solution is mixed with the organic amine.
- the initial quantum dot nuclei in order to make the initial quantum dot nuclei uniformly dispersed in the solvent (the initial quantum dot nuclei are individually present in the solution and maintain a proper distance from each other), it provides good for shell growth on the surface of the initial quantum dot nuclei Conditions, to obtain a shell layer with good dispersion and uniform thickness, in the initial quantum dot core solution, the volume ratio of the mass of the initial quantum dot core to the solvent is 10 mg : (5 ⁇ 15 ml) °
- step E01 in the step of mixing the initial quantum dot core with an organic amine, according to the mass molar ratio of the quantum dot core to the organic amine is 10 mg: (3 ⁇ 10 mmol), disperse the initial quantum dot nuclei in a solution containing the organic amine, and perform surface modification treatment on the initial quantum dot nuclei.
- the organic amine may have a certain excess, but the organic amine may not be excessive, otherwise If the viscosity is too high, it will affect the subsequent long shell rate, which is not conducive to the formation of the shell.
- a shell growth reaction is performed on the surface of the initial quantum dot core to prepare a shell.
- the shell source precursor may be injected once into the solution containing the initial quantum dot core to perform a shell growth; in another embodiment of the present application, the shell source precursor may be injected into the solution multiple times. In a solution system containing an initial quantum dot core or a shell growth solution, multiple shell growths are performed.
- a shell source precursor is added to the initial quantum dot core for the first shell growth to prepare a first shell layer; further, on the basis of the first shell layer, a shell source precursor is added
- the second shell growth is performed on the body, and a second shell layer is prepared on the surface of the first shell layer; in this manner, the N-th shell layer is prepared through N shell growths.
- the surface of each shell layer is combined with the organic carboxylic acid in the shell growth reaction system and the organic ligand after pyrolysis of the shell-source anion precursor and shell-source cation precursor, so that each preparation After the shell layer, the materials have a good monodispersity, which is conducive to subsequent progress
- the shell layer grows or has better dispersion performance when used as a product.
- the shell source precursor includes a shell source cationic precursor and a shell source anion precursor.
- the shell-source cation precursor is at least one of organic metal carboxylates formed from oxides or metal salts of metals such as Cd, Zn, Pb, Ag, Hg, Fe, In, A1, and organic carboxylic acids .
- the shell-source cationic precursor is selected from zinc oleate, lead oleate, silver oleate, mercury oleate, indium oleate, copper oleate, iron oleate, manganese oleate, aluminum oleate , Zinc stearate, lead stearate, silver stearate, mercury stearate, indium stearate, copper stearate, iron stearate, manganese stearate, aluminum stearate, myristic acid Zinc, lead tetradecanoate, silver tetradecanoate, mercury tetradecanoate, indium tetradecanoate, copper tetradecanoate, iron tetradecanoate, manganese tetradecanoate, aluminum tetradecanoate, Zinc hexadecanoate, lead hexadecanoate, silver hexadecanoate, mercury hexadecanoate, Zinc he
- the shell-source anion precursor is prepared.
- the organic molecule is selected from trioctylphosphine, tributylphosphine, oleic acid, and At least one of octaene, but not limited to this.
- the organic molecule of the non-metallic atom is an organic molecule containing a single functional group mercapto (-HS) functional group (such as: octadecanethiol, heptadecanethiol, (Cetanethiol, pentathiol, tetradecanethiol, tridecanethiol, dodecanethiol, octathiol, etc. are not limited to this).
- -HS mercapto
- the choice of the shell source is not limited, in some embodiments, it should be satisfied that the band gap of the obtained shell layer is larger than the band gap of the initial quantum dot core.
- the shell-source cationic precursor is selected from at least one of organometallic carboxylates of Cd, Zn, and Pb, and the shell-source anion precursor is selected from An anion complex or thiol formed by dispersing Te, Se, and S in organic molecules.
- each time the shell source is injected for shell growth the order of addition of the shell cationic precursor and the shell anionic precursor is not strictly limited.
- the shell source is before the shell cations are dispersed
- a mixed precursor solution of the precursor and the shell anion precursor; the method of adding the shell source may be as follows: the cationic precursor and the anionic precursor are injected into the solvent separately to configure the cationic precursor solution and the anionic precursor solution, and the first injection After the shell cationic precursor solution is injected into the shell anionic precursor solution; or, the cationic precursor and the anionic precursor are injected into the solvent separately to configure the cationic precursor solution and the anionic precursor solution, and the shell anionic precursor solution is injected first Inject the shell cationic precursor solution; or, inject the cationic precursor and the anionic precursor into the solvent to obtain a mixed solution containing the cationic precursor and the anionic precursor, and inject the mixed solution into the solution or shell containing the initial quantum dot core Growing solution
- the concentration range of the shell source cationic precursor solution is (0.5-1.5mmol / ml); the concentration range of the shell source anion precursor solution is (0.5 ⁇ 1.5mmol / ml)
- the proper concentration is conducive to uniformly combining the shell-source cationic precursor and the shell-source anion precursor on the surface of the initial quantum dot core, and forming a uniform and stable shell layer by crystallization.
- the mass ratio of the shell-source cationic precursor to the initial quantum dot core is (1 to 1.5 mmol): 10 mg, and / or the shell-source anion precursor and the The mass ratio of the initial quantum dot core is (1-1.5 mmol): 10 mg, and the shell source precursor is injected into the solution system containing the initial quantum dot core or the shell layer growth.
- This method is conducive to uniformly and stably binding the anion precursor and the cationic precursor on the surface of the initial quantum dot core, and obtaining a shell layer with an appropriate thickness.
- the temperature at which the shell layer is prepared on the surface of the initial quantum dot core after the modification treatment is 150-320 ° C, which is favorable for the crystallization of the anion and cationic precursors into a shell within this temperature range, and Does not affect the stability of quantum dots.
- the solution system after the completion of the shell growth reaction is mixed with an organic phosphine to combine the organic phosphine with the non-metallic atoms on the surface of the quantum dot shell to reduce
- the defect states on the surface of the core-shell nanocrystals further increase the fluorescence intensity of the core-shell structure quantum dots.
- the solution system after the completion of the shell growth reaction is mixed with an organic phosphine, and heated at a temperature of 100-320 ° C for 10-60 min. Under the conditions, the organic phosphine is combined with the non-metal atoms on the surface of the quantum dot shell layer to reduce the defect state on the surface of the core-shell nanocrystals and further increase the fluorescence intensity of the core-shell structure quantum dots.
- the temperature of mixing treatment of the organic phosphine and the solution system after the shell growth reaction is completed is too low and / or the time is too short, the effect of the organic phosphine to passivate the anion vacancy Not obvious, can not even play a passivating role, and thus can not improve the fluorescence intensity of the core-shell structure nanocrystals; if the organic phosphine and the solution system after the shell growth reaction is completed, the mixing treatment temperature is too high, not only the organic phosphine is easy to volatilize, affecting the modification treatment Effect, and high temperature conditions will affect the structural stability of the core-shell structure nanocrystal itself.
- step E03 in the step of mixing and heating the system after the completion of the shell growth reaction with the organic phosphine, in some embodiments, according to the molar mass ratio of the organic phosphine to the initial quantum dot core (2 ⁇ 5 mmol): 10 mg, disperse the core-shell structure quantum dots into a solution containing organic phosphine. If the content of the organic phosphine is too low, the effect of passivating anion vacancies is not obvious, and it is difficult to significantly increase the fluorescence intensity of the quantum point of the core-shell structure. If the content of the organic phosphine is too high, it will affect the film-forming performance of the core-shell structure nanocrystals when preparing the film layer.
- step E03 in one embodiment, the system after the shell growth reaction is completed is mixed with an organic carboxylic acid, so that the organic carboxylic acid can be combined with the remaining shell in the solution system after the shell growth reaction is completed.
- the source cation precursor complexes, eliminating the protonated organic amine attached to the surface of the core-shell structure nanocrystal shell layer, and enhancing the transient lifetime of the core-shell structure nanocrystals.
- step E03 in one embodiment, the solution system after the completion of the shell growth reaction is mixed with an organic carboxylic acid, and heated at a temperature of 240-320 ° C for 30-90 min. Under the conditions, the organic carboxylic acid is combined with non-metallic atoms on the surface of the quantum dot shell to enhance the transient fluorescence lifetime of the core-shell structure nanocrystals.
- the mixing temperature of the solution system and the organic carboxylic acid after the shell growth reaction is too low and / or the time is too short, the effect of the organic carboxylic acid to complex the remaining cationic precursor is not obvious, and thus the core-shell structure nano can not be improved
- the transient fluorescence lifetime of the crystal if the temperature is too high and / or the time is too long, the high temperature conditions will affect the structural stability of the core-shell structure quantum dot itself, such as ligand shedding.
- step E03 in the step of mixing the system after the shell growth reaction is completed with an organic carboxylic acid to bond the organic carboxylic acid to the surface of the shell, in some embodiments, according to The molar mass ratio of the organic carboxylic acid to the initial quantum dot core is (5-10 mmol): 10 mg, and the core-shell structure quantum dots are dispersed into the solution containing the organic carboxylic acid. If the content of the organic carboxylic acid is too low, the effect of eliminating protonated organic amines connected to the surface of the core-shell structure nanocrystalline shell layer is not obvious, and it is difficult to significantly enhance the transient fluorescence lifetime of the nanocrystals.
- the organic acid is an organic acid having 8 to 18 carbon atoms.
- the organic acid reagent is selected from a linear organic acid containing a single amino group. The linear amine is beneficial to reduce steric hindrance and promote the occurrence of complexation.
- the organic acid reagent may be at least one selected from oleic acid, dodecanoic acid, myristic acid, hexadecanoic acid, and octadecanoic acid.
- step E03 in an embodiment, the solution system after the completion of the shell growth reaction is mixed with a mixed solution of organic carboxylic acid and organic phosphine, so that the organic phosphine, organic carboxylic acid and quantum The non-metal atoms on the surface of the shell are combined.
- the organic phosphine is coordinated with the non-metallic atoms on the surface of the nanocrystalline shell layer to further passivate the anion vacancy, reduce the defect state on the surface of the core-shell structure nanocrystals, and increase the fluorescence intensity of the core-shell structure nanocrystals.
- the organic acid When the organic acid performs post-treatment on the core-shell structure nanocrystals, the protonated organic amines connected to the surface of the core-shell structure nanocrystal shell layer can be effectively eliminated, and the transient fluorescence lifetime of the nanocrystals can be enhanced.
- the organic acid and the organic phosphorus form interlaced ligands on the surface of the core-shell structure nanocrystals and combine with the metal and nonmetal atoms on the surface of the nanocrystals. The interlaced ligands will further enhance the nanocrystals. Solubility and stability.
- the organic carboxylic acid can promote the decomposition of a part of the shell that is unstable in crystallization on the surface of the core-shell quantum dots.
- the metal atom obtained after the decomposition and the organic carboxylic acid form a metal cation precursor again, and the anion obtained after the decomposition and the organic phosphine form an anion precursor again.
- the anion and cation precursors formed again during the post-treatment process will undergo a re-shell growth on the surface of the core-shell quantum dots, and the core-shell quantum dots with small particles when the re-formed shell grows due to the large surface of the opposite body
- the growth rate is fast and the shell is given priority again, so the final effect is that the size of the core-shell quantum dots is relatively uniform.
- step E03 in one embodiment, the solution system after the completion of the shell growth reaction is mixed with a mixed solution of an organic amine and an organic phosphine, and heated at a temperature of 100-320 ° C. -60min. Under the conditions, the organic carboxylic acid and the organic phosphine are combined with the non-metal atoms on the surface of the quantum dot shell layer to increase the transient fluorescence lifetime and fluorescence intensity of the core-shell structure quantum dot.
- the mixing temperature of the solution system after the completion of the shell growth reaction and the mixed solution of the organic carboxylic acid and the organic phosphine is too low and / or the time is too short, the effect of the organic amine and the organic phosphine to complex the remaining cationic precursor is not obvious, Furthermore, the transient fluorescence lifetime and fluorescence intensity of the core-shell structure quantum dots cannot be improved; if the temperature is too high and / or the time is too long, the high temperature conditions will affect the structural stability of the core-shell structure quantum dots, such as ligand shedding.
- step E03 in the step of mixing and heating the solution system with the mixed solution of the organic carboxylic acid and the organic phosphine after the shell growth reaction is completed, according to the mole of the organic carboxylic acid and the initial quantum dot core
- the mass ratio is (5 ⁇ 10mmol): 10mg
- the molar mass ratio of the organic phosphine to the initial quantum dot core is (2 ⁇ 5mmol): 10mg
- the solution system and organic carboxylic acid after the shell growth reaction is completed Mix with organic phosphine solution.
- the influence of the content of the organic phosphine and organic carboxylic acid is as described above.
- the embodiments of the present application also provide a core-shell structure quantum dot prepared by the above method.
- the embodiments of the present application provide applications of the core-shell structure quantum dots in the fields of optical devices, optical films, core-shell structure quantum dot inks, glues, biological probes, and the like.
- the optical device includes but is not limited to a quantum dot light emitting diode, a quantum dot sensitized battery.
- the optical film includes but is not limited to a quantum dot light-emitting barrier film, a quantum dot light-emitting tube, and the like.
- the core-shell structure quantum dot ink includes, but is not limited to, an ink formed by combining quantum dots with other different chemical solvents at different ratios.
- the glue includes, but is not limited to, glue composed of core-shell structure quantum dots and other different chemical reagents in different viscosity ratios.
- the biological probe is made of a quantum dot surface modified with a specific substance
- a method for preparing a quantum dot includes the following steps:
- step 1) the prepared CdSe initial quantum dot solution dispersed in n-hexane was added to 2 ml into a solution containing 18 ml of oleic acid and 10 ml of octadecene, heated to 150 ° C and exhausted for 20 min. temperature of the solution was raised to 300 o C.
- the ZnS shell source prepared in step 31) is injected into the CdSe initial quantum dot core prepared in step 2) at a dropping rate of 6 ml / h to the initial initial quantum dot core Long shell in the solution, the injection time is 80min;
- step 3 To the quantum dot mixture prepared in step 3), add an appropriate amount of ethyl acetate and ethanol to centrifuge the CdSe / ZnS quantum dot solution, and then disperse the CdSe / ZnS quantum dot solution obtained by centrifugation again in an appropriate amount of chloroform Disperse it in the solution, and then add acetone and methanol to the solution for precipitation and centrifugal separation. This step is repeated once; the resulting CdSe / ZnS quantum dots are vacuum dried.
- a method for preparing a core-shell structure quantum dot includes the following steps:
- octadecene (ODE) 10 ml is first evacuated at room temperature for 30 mins, then heated to 180 ° C for 60 mins, then maintained at 180 ° C for 30 mins and cooled to room temperature for use;
- the precursor is heated to 250 ° C, and the 2 ml S-ODE precursor in extraction step 14) is injected into the three-necked flask for 10 min to prepare the CdS initial quantum dot nuclei.
- the prepared CdS initial quantum dot nuclei are prepared by centrifugal separation and drying Scattered in Zhengji Ya.
- CdSe shell source Take 1 mmol of cadmium oleate precursor and 1.5 mmol of Se-TOP together and disperse in 10 ml of 18-dilute solution, and then stir for use.
- CdS initial quantum dot nuclei are dispersed in 1ml of OA and 10ml of ODE, exhausted at room temperature for 20min, and then heated to 300 ° C,
- the CdS shell source prepared in step 21) is added dropwise to the CdSe initial quantum dot core solution in step 1) at a drop rate of 6 ml / h for long shell, drop Add time is 80min
- CdS shell source Take 1 mmol of cadmium oleate precursor and 1.5 mmol of 1-dodecanethiol together to disperse in 10 ml of 18-diluted solution, then stir and heat at 80 ° C to make it cloudy The liquid became clear and then cooled to room temperature for use.
- 32) Take 10 mg of CdS / CdSe core-shell structure quantum dots dispersed in 1 ml of OA and 10 ml of ODE, exhaust at room temperature for 20 min, and then heat to 300 ° C,
- CdS shell layer The CdS shell source prepared in step 31) is added dropwise to the CdS / CdSe core-shell structure quantum dot quantum dot solution in step 2) at a dropping rate of 6 ml / h For long shells, the addition time is
- step 41) Add the appropriate amount of ethyl acetate and ethanol to the quantum dot mixture in step 3) to centrifuge the CdS / CdSe / Cd quantum well quantum dot solution, and centrifuge the CdS / CdSe / CdS quantum well
- the quantum dot solution is dispersed again in an appropriate amount of chloroform solution to disperse it, and then acetone and methanol are added to the solution for precipitation and centrifugal separation. This step is repeated once; the resulting CdS / CdSe / CdS quantum well quantum dots are vacuum dried.
- the solubility of the CdS / CdSe / CdS quantum dots prepared according to the method of this example is improved, and the corresponding effect is that the monodispersity of the CdS / CdSe / CdS core-shell quantum dots can be improved; the UV-visible fluorescence spectrum test CdS / CdSe / CdS solution (concentration 0.05mg / ml) absorbance, where the absorbance value range is 0.85 ⁇ 1.62.
- a method for preparing a core-shell structure quantum dot includes the following steps:
- step 1) 2 ml of CdSe initial quantum dots prepared in n-hexane were added to an eighteen dilute solution containing lmT oleic acid and 10 ml, and the CdSe initial quantum The solution was heated to 150 ° C and exhausted for 20 min to remove excess n-hexane solution, and then the temperature of the CdSe solution was increased to 300 ° C.
- CdS shell source Take 1 mmol of cadmium oleate precursor and 1.5 mmol of 1-dodecanethiol together to disperse in 10 ml of 18-diluted solution, then stir at 80 ° C to make it cloudy The liquid becomes clear and then cooled to room temperature for use;
- step 3 Adding an appropriate amount of ethyl acetate and ethanol to the quantum dot mixed solution in step 3) to centrifuge the CdSe / CdS quantum dot solution, and dispersing the CdSe / CdS quantum dot solution obtained by centrifugation again in an appropriate amount of chloroform solution Disperse it, and then add acetone and methanol to the solution for precipitation and centrifugal separation. This step is repeated once; the resulting CdSe / CdS quantum dots are vacuum dried.
- the fluorescence intensity of the CdSe / CdS quantum dots prepared according to the method of the present example is somewhat reduced but the stability after being prepared as a device is improved.
- the quantum yield (QY) of the C dSe / CdS solution at room temperature was tested by the integrating sphere of a fluorescence spectrometer (Edinburgh-FS5), where the QY value ranged from 70 to 79% ; the external quantum efficiency (EQE) of the QLE D device after 30 days of testing ) Reduced
- a method for preparing a core-shell structure quantum dot includes the following steps: 1. Preparation of cadmium selenide (CdSe) initial quantum dot core,
- Dispersion treatment of CdSe initial quantum dot nuclei Take 1 of the prepared CdSe initial quantum dots dispersed in n-hexane and add 2 ml to an octadecene solution containing lmT oleic acid and 10 ml. First, the CdSe initial quantum dots The solution was heated to 150 ° C and exhausted for 20 minutes to remove excess n-hexane solution from the solution, and then the temperature of the CdSe solution was raised to 300 ° C.
- CdS shell source Take 1 mmol of cadmium oleate precursor and 1.5 mmol of 1-dodecanethiol together to disperse in 10 ml of 18-diluted solution, then stir and heat at 80 ° C to make it cloudy The liquid becomes clear and then cooled to room temperature for use;
- the dropping time is 80min;
- step 3 Adding an appropriate amount of ethyl acetate and ethanol to the quantum dot mixed solution in step 3) to dissolve the CdSe / CdS quantum dots
- the solution is centrifuged, and the CdSe / CdS quantum dot solution obtained by centrifugation is dispersed again in an appropriate amount of chloroform solution to disperse it, and then acetone and methanol are added to the solution for precipitation and centrifugal separation. This step is repeated once; the final CdSe is obtained / CdS quantum dots are vacuum dried.
- the CdSe / CdS quantum dots prepared according to the method of this example can further enhance the fluorescence intensity of the quantum dots.
- the quantum yield (Q Y) of the solution at room temperature was tested by the integrating sphere of a fluorescence spectrometer (Edinburgh-FS5). The range of QY value was 78 ⁇ 89%.
- a method for preparing a core-shell structure quantum dot includes the following steps:
- step 1) 2 ml of CdSe initial quantum dots prepared in n-hexane were added to an 18-fold diluted solution containing lmT oleic acid and 10 ml, and the CdSe initial quantum The solution was heated to 150 ° C and exhausted for 20 min to remove the excess n-hexane solution, and then the temperature of the CdSe solution was raised to 300 ° C.
- CdS shell source Take 1 mmol of cadmium oleate precursor and 1.5 mmol of 1-octadecanethiol together to disperse in 10 ml of 18-dilute solution, and then stir and heat at 80 ° C to make it cloudy The liquid becomes clear and then cooled to room temperature for use; [0184] 32) Growth of the CdS shell layer: the CdS shell source prepared in step 31) is added dropwise to the CdSe initial quantum dot core solution in step 2) at a dropping rate of 6 ml / h for long shell, drop Add time is 80min;
- step 3 Adding an appropriate amount of ethyl acetate and ethanol to the quantum dot mixed solution in step 3) to centrifuge the CdSe / CdS quantum dot solution, and dispersing the centrifuged CdSe / CdS quantum dot solution again in an appropriate amount of chloroform solution Disperse it, and then add acetone and methanol to the solution for precipitation and centrifugal separation. This step is repeated once; the resulting CdSe / CdS quantum dots are vacuum dried.
- the CdSe / CdS quantum dots prepared according to the method of this example can improve the stability.
- the quantum sphere yield (QY) of the solution after being placed at room temperature for 30 days was measured by the integrating sphere of a fluorescence spectrometer (Edinburgh-FS5). The QY value ranged from 83 to 91%.
- a method for preparing a core-shell structure nanocrystal includes the following steps:
- step 1) 2 ml of CdSe initial quantum dots prepared in n-hexane were added to an eighteen dilute solution containing lmT oleylamine and 10 ml.
- the quantum dot solution was heated to 150 ° C and exhausted for 20 min to remove excess n-hexane solution from the solution, and then the temperature of the CdSe solution was raised to 300 ° C.
- step 3 Add the appropriate amount of ethyl acetate and ethanol to the mixed solution of quantum dots in step 3) to centrifuge the CdSe / ZnS quantum dot solution, and re-disperse the CdSe / ZnS quantum dot solution obtained by centrifugation in the appropriate amount of chloroform solution Disperse it, and then add acetone and methanol to the solution for precipitation and centrifugal separation. This step is repeated once; the resulting CdSe / ZnS quantum dots are vacuum dried.
- the CdSe / CdS quantum dots prepared according to the method of this embodiment reduce the generation of shell defects during shell growth, and the corresponding effect is that the fluorescence intensity of the CdSe / CdS core-shell quantum dots can be improved; Integrating sphere (Edinburgh-FS5) measures the quantum yield (QY) of the solution at room temperature, where the QY value ranges from 78 to 83%.
- a method for preparing a core-shell structure nanocrystal includes the following steps:
- octadecene (ODE) 10 ml is first evacuated at room temperature for 30 mins, then heated to 180 ° C to exhaust argon 60 mins, then maintain a vacuum of 180 ° C for 30 mins and cool to room temperature for use;
- TOP trioctylphosphine oxide
- TOP trioctylphosphine oxide
- ⁇ Precursor is heated to 250 ° C, extracting step 14) 2ml of S-ODE precursor is injected into a three-necked flask and reacted for 10min to prepare CdS quantum dot nuclei, and the prepared CdS initial quantum dot nuclei are dispersed in N-hexane.
- CdS initial quantum dot nuclei are dispersed in 1ml of OAm and 10ml of ODE, first exhausted at room temperature for 20min, and then heated to 300 ° C;
- CdS shell growth Take the CdS shell source prepared in step 21) at a drop rate of 6 ml / h to the CdSe initial quantum dot core solution in 1 for long shells, drop time 80min;
- CdS / CdSe quantum dots are dispersed in 1ml of OAm and 10ml of ODE, exhausted at room temperature for 20min, and then heated to 300 ° C;
- step 3 Add the appropriate amount of ethyl acetate and ethanol to the quantum dot mixed solution in step 3) to centrifuge the CdS / CdSe / Cd quantum well quantum dot solution, and centrifuge the CdS / CdSe / CdS quantum well quantum dot solution Disperse again in the appropriate amount of chloroform solution to disperse it, then add acetone and methanol to the solution for precipitation and centrifugal separation. This step is repeated once; the resulting CdS / CdSe / CdS quantum well quantum dots are vacuum dried.
- the CdS / CdSe / CdS quantum dots prepared according to the method of this embodiment reduce the generation of shell defects during shell growth, and the corresponding effect is that the fluorescence intensity of the CdS / CdSe / CdS core-shell quantum dots can be increased;
- the quantum yield (QY) of the solution at room temperature was measured by the integrating sphere of a fluorescence spectrometer (Edinburgh-FS5), where the QY value ranged from 75 to 85%.
- a method for preparing a core-shell structure nanocrystal includes the following steps:
- CdSe initial quantum dots Inject 1ml of trioctylphosphine solution into step 11), and when the temperature of the solution returns to 380 ° C, inject Se precursor in step 12) for 30 s, and then Inject 10ml of eighteen dilute quenching reaction to cool to room temperature and wash; 14) Washing and purification of CdSe initial quantum dots: adding 30 ml of acetone to the initial quantum dot mixture to centrifuge the quantum dots, and dispersing the centrifugally separated CdSe initial quantum dots in 10 ml of hexane
- Dispersion treatment of CdSe initial quantum dot nuclei Take 2 ml of CdSe initial quantum dots dispersed in n-hexane prepared in step 1) and add it to an octadecene solution containing lmT oleylamine and 10 ml. The quantum dot solution was heated to 150 ° C and exhausted for 20 min to remove excess n-hexane solution from the solution, and then the temperature of the CdSe solution was raised to 300 ° C.
- step 3 Add the appropriate amount of ethyl acetate and ethanol to the quantum dot mixture in step 3) to centrifuge the CdSe / CdS quantum dot solution, and then disperse the CdSe / CdS quantum dot solution obtained by centrifugation again in the appropriate amount of chloroform solution Disperse it, and then add acetone and methanol to the solution for precipitation and centrifugal separation. This step is repeated once; the resulting CdSe / CdS quantum dots are vacuum dried.
- the CdSe / CdS quantum dots prepared according to the method of this embodiment not only reduce the generation of shell defects during shell growth but also reduce the defect states on the surface of the CdSe / CdS core-shell quantum dots. Further, the corresponding effects It not only enhances the fluorescence intensity of CdSe / CdS core-shell quantum dots but also prolongs the transient fluorescence lifetime of CdSe / CdS core-shell quantum dots; the quantum sphere of the solution at room temperature is tested by the integrating sphere of the fluorescence spectrometer (Edinburgh-FS5) (QY) and transient fluorescence spectroscopy to test the transient lifetime of CdSe / CdS core-shell quantum dots, where The range of QY value is 80 ⁇ 89%, and the lifetime value is 25 ⁇ 30ns.
- a preparation method of a core-shell structure nanocrystal includes the following steps:
- Dispersion treatment of CdSe initial quantum dot nuclei Take the initial CdSe quantum dots dispersed in n-hexane prepared in step 1) 2 ml and add it to an 18-dilute solution containing lmT oleylamine and 10 ml. The quantum dot solution was heated to 150 ° C and exhausted for 20 min to remove excess n-hexane solution from the solution, and then the temperature of the CdSe solution was raised to 300 ° C.
- the CdSe / CdS quantum dots prepared according to the method of this example can further enhance the fluorescence intensity of the quantum dots.
- the quantum yield of the solution at room temperature (Q Y) was measured by the integrating sphere of a fluorescence spectrometer (Edinburgh-FS5), where the QY value ranged from 78 to 88%.
- a method for preparing a core-shell structure nanocrystal includes the following steps:
- step 1) 2 ml of CdSe initial quantum dots prepared in n-hexane are added to an 18-fold diluted solution containing lmT oleylamine and 10 ml, and the CdSe initial quantum The solution was heated to 150 ° C and exhausted for 20 min to remove excess n-hexane solution, and then the temperature of the CdSe solution was increased to 300 ° C.
- step 2) 2 ml of CdSe initial quantum dots prepared in n-hexane are added to an 18-fold diluted solution containing lmT oleylamine and 10 ml, and the CdSe initial quantum The solution was heated to 150 ° C and exhausted for 20 min to remove excess n-hexane solution, and then the temperature of the CdSe solution was increased to 300 ° C.
- step 2) 2 ml of CdSe initial quantum dots prepared in n-hexane are added to an 18-fold diluted solution containing lmT oleylamine
- step 3 Add the appropriate amount of ethyl acetate and ethanol to the quantum dot mixed solution in step 3) to centrifuge the CdSe / CdS quantum dot solution, and re-disperse the centrifuged CdSe / CdS quantum dot solution in the appropriate amount of chloroform solution Disperse it, and then add acetone and methanol to the solution for precipitation and centrifugal separation. This step is repeated once; the resulting CdSe / CdS quantum dots are vacuum dried.
- the CdSe / CdS quantum dots prepared according to the method of this example can improve the stability.
- the quantum sphere yield (QY) of the solution after 30 days at room temperature was tested by the integrating sphere of a fluorescence spectrometer (Edinburgh-FS5).
- the QY value range was 83 ⁇ 91%, and the CdSe / CdS solution (concentration 0.05mg / ml) absorbance, where the absorbance value ranges from 0.9 to 1.5.
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