WO2019114832A1 - 一种量子点复合材料及其制备方法 - Google Patents
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- the invention relates to the field of quantum dots, in particular to a quantum dot composite material and a preparation method thereof.
- quantum dots are widely used in the fields of physics, chemistry and biomedicine, especially in the fields of illumination, display, laser and biosensor. Since the quantum dot size is smaller than the exciton Bohr radius of the bulk material, it has a strong quantum size effect. As the size decreases, the electronic structure changes from a quasi-continuous band structure of the bulk material to a discrete atomic-like structure of the atom. At the same time, the energy gap is widened and the blue light is shifted. The color of the quantum dots can be precisely controlled by changing the size and composition of the quantum dots.
- Quantum dots have a continuously distributed excitation spectrum that can be used to excite fluorescence as long as any wavelength shorter than 10 nm below the emission peak.
- the spectral range currently applied to quantum dot excitation has extended from the ultraviolet region to the visible region.
- quantum dot materials that can be effectively excited by infrared light have not been reported.
- quantum dots are metastable materials whose large specific surface area, high surface energy and poor environmental stability lead to oxidation and photothermal degradation.
- the fluorescence performance of the quantum dot is inevitably affected by the strong light irradiation.
- UV irradiation increases the thermal excitation process, such as photo-oxidation and maturation/sintering, which reduces the luminous intensity of quantum dots and shifts the emission peak. This is because (1) a chemical reaction occurs on the surface of the quantum dot, and a defect is formed on the surface; (2) the average temperature is higher than 50 degrees Celsius by photon absorption, and a local, transient high temperature point is generated to cause the quantum dot to occur. Reunion.
- the object of the present invention is to provide a quantum dot composite material and a preparation method thereof, aiming at solving the phenomenon that the surface of the quantum dot is oxidized and locally sintered by directly exciting the quantum dots by ultraviolet light, and There is a problem that infrared light cannot excite quantum dots to emit light.
- a quantum dot composite material comprising:
- the material of the core being an upconverting fluorescent nanomaterial
- quantum dot being bonded to a surface of the spacer layer, the spacer layer for reducing a rate of non-radiative decay of the upconverting fluorescent nanomaterial when transferring energy to the quantum dot.
- the quantum dot composite material wherein the spacer layer is formed by laminating 2-10 layers of sub-materials, the total thickness of the spacer layer is denoted by d, d is 5-20 nm, and preferably d is 5-15 nm.
- the upconverting fluorescent nanomaterial used as a core material is an activator doped upconversion fluorescent nanomaterial matrix material, and the activator is selected from the group consisting of Tm 3+ , Er 3+ , Pr 3+ , Nd 3+ , and Sm 3 .
- the fluorescent nanomaterial is an upconverting fluorescent nanomaterial matrix material doped with an activator and a sensitizer selected from the group consisting of Tm 3+ , Er 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Ho 3+ One or more of Ti 2+ , Cr 3+ , Ni 2+ , Mo 3+ , Re 4+ , and Os 4+ , etc.; the sensitizer is Yb 3+ .
- the up-converting fluorescent nano material matrix material used as an activator doping of a core material is selected from a fluoride up-conversion fluorescent nano material matrix One of a material, an oxide upconverting fluorescent nanomaterial matrix material, and a composite oxide upconverting fluorescent nanomaterial matrix material; the activator and sensitizer doped upconversion fluorescent nanomaterial matrix used as a core material
- the up-converting fluorescent nanomaterial matrix material is one selected from the group consisting of a fluoride up-converting fluorescent nanomaterial matrix material, an oxide up-converting fluorescent nanomaterial matrix material, and a composite oxide upconversion fluorescent nanomaterial matrix material.
- the fluoride up-converting fluorescent nano material matrix material is selected from the group consisting of NaYF 4 , NaGaF 4 , CaF 2 , NaSrF 4 , BaY 2 F 4 , LiYF 4 , ScYF 4 , NaLnF 4 , SrF 2 , BaF 2 , MnF 2 And one of Cs 2 GeF 6 .
- the oxide up-converting fluorescent nano material matrix material is selected from the group consisting of Y 2 O 3 , ZrO 2 , TiO 2 , Gd 2 O 3 , In 2 O 3 , SrY 2 O 4 , TeO 2 , Al 2 O 3 , One of ZnO 2 , Lu 2 O 3 , Er 2 O 3 , Eu 2 O 3 , CeO 2 and La 2 O 3 .
- the composite oxide up-converting fluorescent nano material matrix material is selected from the group consisting of LiNbO 3 , Ln 2 BaZnO 2 , ALn (MoO 4 ) 2 , GdVO 4 , YVo 4 , CaZrO 3 , CaSc 2 O 4 , KLu (WO 4 2 ) CaCs 2 O 4 , CaMoO 4 , BaTiO 3 , Y 2 Ti 2 O 7 , Y 2 Si 2 O 7 , Y 2 SiO 5 , Gd 3 Ga 5 O 12 , Y 3 Al 5 O 12 and Y 2 CaGe One of 4 O 12 .
- the quantum dot composite material wherein the quantum dots are selected from the group consisting of CdSe, CdS, ZnSe, ZnS, PbSe, PbS, CdTe, ZnO, MgO, CeO 2 , NiO, TiO 2 , InP, CaF 2 , CdZnS, CdZnSe , CdSeS, PbSeS, ZnCdTe, CdS/ZnS, CdZnSe/ZnSe, CdSeS/CdSeS/CdS, CdSe/CdZnSe/CdZnSe/ZnSe, CdZnSe/CdZnSe/ZnSe, CdZnSe/CdZnSe/ZnSe, CdZnS/ZnS, CdS/CdZnS/CdZnS/ZnS, CdZnSeS, CdS/C
- the quantum dot composite material wherein the material used as the spacer layer is an up-converting fluorescent nano material matrix material.
- the quantum dot composite material wherein the upconverting fluorescent nano material matrix material used as a material of the spacer layer is selected from the group consisting of a fluoride upconversion fluorescent nano material matrix material, an oxide upconversion fluorescent nano material matrix material, and A composite oxide upconverting one of the fluorescent nanomaterial matrix materials.
- the quantum dot composite material wherein the fluoride up-converting fluorescent nano material matrix material used as a material of the spacer layer is selected from the group consisting of NaYF 4 , NaGaF 4 , CaF 2 , NaSrF 4 , BaY 2 F 4 , LiYF 4 , one or more of ScYF 4 , NaLnF 4 , SrF 2 , BaF 2 , MnF 2 and Cs 2 GeF 6 .
- the quantum dot composite material wherein the oxide up-converting fluorescent nano material matrix material used as a material of the spacer layer is selected from the group consisting of Y 2 O 3 , ZrO 2 , TiO 2 , Gd 2 O 3 , In 2 One or more of O 3 , SrY 2 O 4 , TeO 2 , Al 2 O 3 , ZnO 2 , Lu 2 O 3 , Er 2 O 3 , Eu 2 O 3 , CeO 2 and La 2 O 3 .
- the quantum dot composite material wherein the composite oxide up-converting fluorescent nano material matrix material used as a material of the spacer layer is selected from the group consisting of LiNbO 3 , Ln 2 BaZnO 2 , ALn(MoO 4 ) 2 , GdVO 4 , YVo 4 , CaZrO 3 , CaSc 2 O 4 , KLu(WO 4 ) 2 , CaCs 2 O 4 , CaMoO 4 , BaTiO 3 , Y 2 Ti 2 O 7 , Y 2 Si 2 O 7 , Y 2 SiO 5 , Gd One or more of 3 Ga 5 O 12 , Y 3 Al 5 O 12 and Y 2 CaGe 4 O 12 .
- the quantum dot composite material wherein the spacer layer is formed by laminating 2-10 layers of sub-material layers, the materials of the sub-material layers are independently selected from an oxide material, an up-converting fluorescent nano material matrix material, and polymerization. Two or three of the materials.
- the material of the first layer of the material layer covering the core is an up-converting fluorescent nano material matrix material
- the second layer of the sub-material is coated with the first layer of the material layer, each of the latter a material layer is coated on the front sub-material layer to form the spacer layer
- the material of the second sub-material layer to the last layer of the sub-material layer is independently selected from an oxide material, an up-converting fluorescent nano material matrix material or Polymer material.
- a method for preparing a quantum dot composite material comprising the steps of:
- the material of the core particle being an up-converting fluorescent nano material
- the spacer layer serves to reduce a rate of non-radiative decay of the upconverting fluorescent nanomaterial as it transfers energy to the quantum dots.
- the method for preparing a quantum dot composite material wherein the surface modifier is selected from the group consisting of an organic ligand containing a mercapto group, an organic ligand containing an amine group, an organic ligand of a carboxylic acid and a carboxylic acid derivative, and an amphiphilic polymer.
- the surface modifier is selected from the group consisting of an organic ligand containing a mercapto group, an organic ligand containing an amine group, an organic ligand of a carboxylic acid and a carboxylic acid derivative, and an amphiphilic polymer.
- the surface modifier is selected from the group consisting of an organic ligand containing a mercapto group, an organic ligand containing an amine group, an organic ligand of a carboxylic acid and a carboxylic acid derivative, and an amphiphilic polymer.
- the above-mentioned converted fluorescent nano material is a core, the outer layer is covered with a spacer layer, and quantum dots are combined outside the spacer layer to form the quantum dot composite material.
- Adding the spacer layer between the upconverting fluorescent nanomaterial and the quantum dot is for reducing a non-radiative decay rate when the upconverting fluorescent nanomaterial transfers energy to the quantum dot, in order to avoid the quantum dot Direct contact with the upconverting fluorescent nanomaterial produces a lossy surface wave.
- Example 1 is a fluorescence spectrum diagram of NaYF 4 :Er 3+ /Yb 3+ @mNaYF 4 corresponding to m, 1, 2, 3, 4, and 5, respectively, in Example 1 of the present invention.
- Embodiment 2 is an emission spectrum diagram of a quantum dot composite material corresponding to different thickness spacer layers in Embodiment 1 of the present invention.
- Embodiment 3 is an emission spectrum diagram of a quantum dot composite material corresponding to different thickness spacer layers in Embodiment 4 of the present invention.
- Embodiment 4 is an emission spectrum diagram of a quantum dot composite material corresponding to different thickness spacer layers in Embodiment 8 of the present invention.
- FIG. 5 is a flow chart showing the preparation of a quantum dot composite material according to Embodiment 10 of the present invention.
- Figure 6 is a TEM image of a quantum dot composite prepared in Example 10 of the present invention.
- Embodiment 7 is an emission spectrum diagram of a quantum dot composite material of different thickness spacer layers in Embodiment 15 of the present invention, and an emission spectrum of NaGdF 4 : Tm 3+ /Yb 3+ /Nd 3+ .
- Embodiments of the present invention provide a quantum dot composite material, including:
- the material of the core being an upconverting fluorescent nanomaterial
- quantum dot being bonded to a surface of the spacer layer, the spacer layer for reducing a rate of non-radiative decay of the upconverting fluorescent nanomaterial when transferring energy to the quantum dot.
- the fluorescent nanomaterial is converted into a core, the outer layer is covered with a spacer layer, and quantum dots are combined outside the spacer layer to form the quantum dot composite material.
- the spacer layer is added between the upconverting fluorescent nanomaterial and the quantum dots to avoid direct contact between the quantum dots and the upconverting fluorescent nanomaterial to generate a lossy surface wave.
- a surface wave is a non-radiative transition that can be thought of as being consumed in the form of heat.
- a spacer layer is disposed between the up-converting fluorescent nano material and the quantum dot, and the spacer layer is configured to reduce a non-radiative decay rate when the up-converting fluorescent nano material transfers energy to the quantum dot, avoiding the quantum The point is in direct contact with the upconverting fluorescent nanomaterial to produce a lossy surface wave.
- the thickness d of the spacer layer is set within 5 nm ⁇ d ⁇ 20 nm, the rate of non-radiation decay is slowed, and the rate of radiation decay is increased, and the energy of the radiation is effectively transmitted to the quantum dots, thereby exciting Quantum dots emit light.
- the upconverting fluorescent nanomaterial and the quantum dot tend to contact each other, due to the action of the surface wave, the transition is released in a non-radiative manner, and the quantum dot does not emit light; when it is greater than 20 nm, due to upconversion of the fluorescent nanomaterial and quantum The point distance increases, reducing the energy transfer efficiency, thereby reducing its luminous intensity.
- the upconverting fluorescent nanomaterial is excited by infrared light, the upconversion of the upconverting fluorescent nanomaterial is utilized, the infrared light is converted into visible radiation, and the quantum at the ground state is transmitted by energy transfer at a certain distance.
- Point illuminating thereby achieving the purpose of infra-red light-exciting quantum dot luminescence, improving the utilization of infrared light, and thus effectively avoiding the problems of directly oxidizing quantum dots on the surface of quantum dots caused by excitation of quantum dots by ultraviolet light, and locally sintering.
- Light stability and luminous intensity can be a layer, and in some embodiments, to produce uniform composite particles, the spacer layer can also be formed by laminating 2-10 layers of sub-material layers.
- the upconverting fluorescent nanomaterial used as a core material is an activator doped upconverting fluorescent nanomaterial matrix material.
- the activator is selected from the group consisting of Tm 3+ , Er 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Ho 3+ , Ti 2+ , Cr 3+ , Ni 2+ , One or more of Mo 3+ , Re 4+ , and Os 4+ , and the like.
- the upconverting fluorescent nano material matrix material is selected from the group consisting of fluoride upconversion fluorescent nano material matrix materials and oxides. One of an up-conversion fluorescent nanomaterial matrix material and a composite oxide upconversion fluorescent nanomaterial matrix material.
- the upconverting fluorescent nanomaterial is NaYF 4 :Er 3+ , NaYF 4 :Tm 3+ /Nd 3+ , CaF 2 :Er 3+ , NaGdF 4 :Ho 3+ , or the like One or more.
- the oxide upconverting fluorescent nanomaterial matrix material used as a core material is selected from the group consisting of Y 2 O 3 , ZrO 2 , TiO 2 , Gd 2 O 3 , In 2 O 3 , SrY 2 O 4 , one of TeO 2 , Al 2 O 3 , ZnO 2 , Lu 2 O 3 , Er 2 O 3 , Eu 2 O 3 , CeO 2 and La 2 O 3 .
- the up-converting fluorescent nanomaterial may be one or more of In 2 O 3 :Er 3+ , Y 2 O 3 :Er 3+ , and the like.
- the upconverting fluorescent nanomaterial is LiGd(MoO 4 ) 2 :Er 3+ .
- the upconverting fluorescent nanomaterial used as a core material is an activator and sensitizer doped upconversion fluorescent nanomaterial matrix material.
- the activator is used in combination with a sensitizer that enhances energy transfer and increases the luminescence intensity of the activator.
- the activator is selected from the group consisting of Tm 3+ , Er 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Ho 3+ , Ti 2+ , Cr 3+ , Ni 2+ , One or more of Mo 3+ , Re 4+ , and Os 4+ , etc.; the sensitizer is Yb 3+ .
- the upconverting fluorescent nano material matrix material is selected from the group consisting of fluoride upconversion fluorescent nanometers.
- a material matrix material an oxide upconversion fluorescent nano material matrix material, and a composite oxide upconversion fluorescent nano material matrix material.
- the upconverting fluorescent nano material may be NaYF 4 :Er 3+ /Yb 3+ , NaYF 4 :Tm 3+ /Yb 3+ /Nd 3+ , CaF 2 :Er 3+ / One or more of Yb 3+ , NaGdF 4 : Ho 3+ /Yb 3+ , and the like.
- the oxide upconverting fluorescent nanomaterial matrix material used as a core material is selected from the group consisting of Y 2 O 3 , ZrO 2 , TiO 2 , Gd 2 O 3 , In 2 O 3 , SrY 2 O 4 , one of TeO 2 , Al 2 O 3 , ZnO 2 , Lu 2 O 3 , Er 2 O 3 , Eu 2 O 3 , CeO 2 and La 2 O 3 .
- the up-converting fluorescent nano material may be one or more of In 2 O 3 :Er 3+ /Yb 3+ , Y 2 O 3 :Er 3+ /Yb 3+ , and the like. .
- the upconverting fluorescent nanomaterial is NaYF 4 :Er 3+ /Yb 3+ , NaYF 4 :Tm 3+ /Yb 3+ /Nd 3+ , CaF 2 :Er 3+ /Yb One or more of 3+ and NaGdF 4 : Ho 3+ /Yb 3+ .
- the upconverting fluorescent nanomaterial may be LiGd(MoO 4 ) 2 :Er 3+ /Yb 3+ .
- the core has a diameter of 7-20 nm, and a too large size of the core results in a decrease in solubility of the composite.
- the quantum dots are selected from the group consisting of CdSe, CdS, ZnSe, ZnS, PbSe, PbS, CdTe, ZnO, MgO, CeO 2 , NiO, TiO 2 , InP, CaF 2 , CdZnS, CdZnSe, CdSeS , PbSeS, ZnCdTe, CdS/ZnS, CdZnSe/ZnSe, CdSeS/CdSeS/CdS, CdSe/CdZnSe/CdZnSe/ZnSe, CdZnSe/CdZnSe/ZnSe, CdZnSe/CdZnSe/ZnSe, CdZnS/ZnS, CdS/CdZnS/CdZnS/ZnS, CdZnSeS, CdS/CdZnS/CdZ
- Embodiments of the present invention add the spacer layer between the upconverting fluorescent nanomaterial and the quantum dots to reduce a rate of non-radiative decay when the upconverting fluorescent nanomaterial transfers energy to the quantum dots.
- Some embodiments of the present invention use infrared light to excite up-converting fluorescent nanomaterials, use up-conversion of upconverting fluorescent nanomaterials to convert infrared light into visible radiation, and use energy transfer to excite quantum dot luminescence to achieve effective excitation of infrared light. The purpose of quantum dot luminescence.
- the surface of the spacer layer is bonded with a surface modifying agent.
- the surface modifying agent is selected from the group consisting of an organic ligand containing a mercapto group, an organic ligand containing an amine group, a carboxylic acid, and One or more of a carboxylic acid derivative organic ligand and an amphiphilic polymer. That is, some embodiments of the present invention surface-modify the spacer layer using an organic ligand containing a mercapto group, an organic ligand containing an amine group, an organic ligand of a carboxylic acid and a carboxylic acid derivative, or an amphiphilic polymer.
- the spacer layer of the nano material particles is surface-modified with an organic ligand, and the groups in the organic ligand (such as an amine group, a sulfhydryl group, a carboxyl group) can be combined with the metal elements on the surface of the quantum dot, thereby making the spacer layer easier.
- the groups in the organic ligand such as an amine group, a sulfhydryl group, a carboxyl group
- a site for binding is provided to the quantum dots to form a quantum dot composite.
- the material used as the spacer layer is an up-converting fluorescent nano material matrix material
- the up-converting fluorescent nano material matrix material used as a spacer layer material is an up-converting fluorescent nanometer that can be used as a nuclear material.
- the up-converting fluorescent nano material matrix material is selected from the group consisting of a fluoride upconversion fluorescent nano material matrix material, an oxide upconversion fluorescent nano material matrix material, and a composite oxide upconversion fluorescent nano material matrix material. One of them.
- the oxide up-converting fluorescent nanomaterial matrix material used as the spacer layer may be selected from the group consisting of Y 2 O 3 , ZrO 2 , TiO 2 , Gd 2 O 3 , In 2 O 3 , and SrY 2 .
- the upconverting fluorescent nanomaterial matrix material used as a spacer layer is one or more of NaYF 4 , NaGdF 4 , CaF 2 , NaSrF 4 .
- the up-converting fluorescent nano material matrix material used as the spacer layer material may be the same as or different from the up-conversion fluorescent nano material matrix material used in the up-conversion fluorescent nano material used as the core material.
- the materials of the respective sub-material layers laminated to form the spacer layer are the same or different.
- the upconversion fluorescent nanomaterial matrix material is used as a mechanism of the spacer layer: according to the distance constraint mechanism, when the upconversion fluorescent nanomaterial is too small to be separated from the quantum dots, the non-radiation decay rate is rapidly increased, and the radiation is increased. The rate of decay is reduced, and the energy radiated by the upconverting fluorescent nanomaterial is not transmitted to the quantum dots, but is released in the form of heat.
- the separation distance is within 5 nm ⁇ d ⁇ 20 nm, the non-radiative decay rate is slowed, and the radiation decay rate is increased, and the energy of the radiation is efficiently transmitted to the quantum dots, thereby exciting the quantum dot luminescence.
- the quantum dot composite coated with the upconverting fluorescent nanomaterial matrix material reduces the surface defects of the upconverting fluorescent nanomaterial particles due to the repair of the surface defects of the core, so that the rare earth ions are better doped into the crystal lattice. , thereby improving the luminous intensity of the quantum dot composite.
- the material of the spacer layer is a polymer material, and the materials of the respective sub-material layers laminated to form the spacer layer are the same or different.
- the polymer material may be a non-polar polymer such as polystyrene (PS) and copolymers thereof, for example: polystyrene-maleic anhydride (P(St-MAH)), polystyrene-acrylic acid butyl Ester (P(ST-BA)), polystyrene-acrylonitrile (P(ST-AN)), nitrocellulose (NC); may also be hydroxyl terminated polybutadiene (HTPB); also may be polyacrylic acid (PA) and its copolymers, for example: polyacrylic acid-butyl acrylate (P(AA-BA)), polyacrylic acid-styrene, polytrimethylolpropane triacrylate (PTMPTA), polymethyl methacrylate (PMMA), a polymer such as polyamide-amine (PAMAM).
- the polymer material is used as a mechanism of action of the spacer layer: according to the distance constraint mechanism, when the up-conversion fluorescent nanomaterial is too small from the quantum dot, the non-radiative decay rate is rapidly increased, and the radiation decay rate is decreased. The energy radiated by the upconverting fluorescent nanomaterial is not transmitted to the quantum dots, but is released in the form of heat. It has been found by the inventors that when the thickness of the spacer layer is within 5 nm ⁇ d ⁇ 20 nm, the non-radiative decay rate is slowed down, and the radiation decay rate is increased, and the energy of the radiation is efficiently transmitted to the quantum dots, thereby exciting the quantum dot luminescence.
- the material of the spacer layer is an oxide material, and the materials of the respective sub-material layers laminated to form the spacer layer are the same or different.
- the oxide material used as the spacer layer material may be the same as or different from the oxide up-conversion fluorescent nano material matrix material in the up-conversion fluorescent nanomaterial used as the core material.
- the oxide material used as the spacer layer material is one or more selected from the group consisting of SiO 2 , Fe 3 O 4 , Al 2 O 3 , and TiO 2 .
- an oxide material is used as a mechanism of action of the spacer layer: according to the distance constraint mechanism, when the up-conversion fluorescent nanomaterial is spaced apart from the quantum dot too small, the non-radiative decay rate is rapidly increased, and the radiation decay rate is decreased. The energy radiated by the upconverting fluorescent nanomaterial is not transmitted to the quantum dots, but is released in the form of heat. It has been found by the inventors that when the thickness of the spacer layer is within 5 nm ⁇ d ⁇ 20 nm, the non-radiative decay rate is slowed down, and the radiation decay rate is increased, and the energy of the radiation is efficiently transmitted to the quantum dots, thereby exciting the quantum dot luminescence.
- the quantum dot comprises a core, the material of the core is an up-converting fluorescent nanomaterial; a spacer layer, the spacer layer covers the core, and the material of the spacer layer is 2
- a 10-layer sub-material layer is formed by lamination, and the materials of the sub-material layers are independently selected from two or three of an oxide material, an up-converting fluorescent nano material matrix material, and a polymer material.
- the material of each sub-material layer is selected on the basis of two or three kinds of oxide materials, up-conversion fluorescent nano material matrix materials and polymer materials, and then on the oxide material, The result of matching the specific selection of the fluorescent nanomaterial matrix material or the polymer material, that is, after the combination of the selected oxide material, the up-converting fluorescent nano material matrix material, and the polymer material,
- the material of each of the sub-material layers may independently be one or more of the oxide materials in one or more of the specific embodiments, the up-converting fluorescent nanomaterial matrix material, in some specific embodiments, one or more, or a polymer One or more of the materials in some specific embodiments.
- the up-converting fluorescent material matrix material used as the sub-material layer is selected from the group consisting of One of a fluoride upconversion fluorescent nanomaterial matrix material, an oxide upconversion fluorescent nanomaterial matrix material, and a composite oxide upconversion fluorescent nanomaterial matrix material.
- the oxide material used as the sub-material layer is independently selected from SiO 2 , Fe 3 O 4 One of Al 2 O 3 and TiO 2 .
- the polymer material used as the sub-material layer is independently selected from polystyrene-maleic anhydride. , polystyrene-butyl acrylate, polystyrene-acrylonitrile, nitrocellulose, hydroxyl terminated polybutadiene, polyacrylic acid-butyl acrylate, polyacrylic acid-styrene, polytrimethylolpropane triacrylate, One of polymethyl methacrylate and polyamide-amine.
- the oxide material the up-converting fluorescent nanomaterial matrix material, and the polymer material is as described above and will not be described herein.
- the spacer layer formed by laminating the oxide material, the up-converting fluorescent nano material matrix material, and the polymer material sub-material layer the mechanism of action: according to the distance constraint mechanism, when up-converting the fluorescent nano material
- the quantum dot is too small, the rate of non-radiative decay increases rapidly, and the rate of radiation decay decreases.
- the energy radiated by the upconverting fluorescent nanomaterial is not transmitted to the quantum dots, but is released in the form of heat.
- the non-radiative decay rate is slowed down, and the radiation decay rate is increased, and the energy of the radiation is efficiently transmitted to the quantum dots, thereby exciting the quantum dot luminescence.
- the material of the first layer of the sub-material layer covering the core is an up-converting fluorescent nanomaterial matrix material
- the second layer of the sub-material layer is coated with the first layer of the sub-material layer, each of which is The sub-material layer is coated on the front sub-material layer to form the spacer layer, and the material of the second sub-material layer to the last layer of the sub-material layer is independently selected from the group consisting of an oxide material and an up-converting fluorescent nano material matrix.
- the up-converting fluorescent material matrix material used as the first sub-material layer is selected from the group consisting of a fluoride upconversion fluorescent nano material matrix material, an oxide upconversion fluorescent nano material matrix material, and a composite oxide upconversion fluorescent nano material matrix material.
- the up-converting fluorescent material matrix material used as the sub-material layer is selected from the group consisting of One of a fluoride upconversion fluorescent nanomaterial matrix material, an oxide upconversion fluorescent nanomaterial matrix material, and a composite oxide upconversion fluorescent nanomaterial matrix material.
- the oxide material used as the sub-material layer is independently selected from SiO 2 , Fe 3 O 4 One of Al 2 O 3 and TiO 2 .
- the polymer material used as the sub-material layer is independently selected from polystyrene-maleic anhydride. , polystyrene-butyl acrylate, polystyrene-acrylonitrile, nitrocellulose, hydroxyl terminated polybutadiene, polyacrylic acid-butyl acrylate, polyacrylic acid-styrene, polytrimethylolpropane triacrylate, One of polymethyl methacrylate and polyamide-amine.
- Embodiments of the present invention also provide a preferred embodiment of a method for preparing a quantum dot composite, comprising the steps of:
- the material of the core particle being an up-converting fluorescent nano material
- the spacer layer serves to reduce a rate of non-radiative decay of the upconverting fluorescent nanomaterial as it transfers energy to the quantum dots.
- the cladding layer is formed by laminating 2-10 layers of self-material layers to form a spacer layer, wherein the first layer sub-material layer covers the core, and the second layer A layer of material coats the first layer of sub-material layers, and each of the subsequent sub-material layers coats the preceding sub-material layer to form the spacer layer.
- the material of the first layer of the sub-material layer covering the core is an up-converting fluorescent nanomaterial matrix material
- the second layer of the sub-material layer is coated with the first layer of the sub-material layer, each of which is The sub-material layer is coated on the front sub-material layer to form the spacer layer, and the material of the second sub-material layer to the last layer of the sub-material layer is independently selected from the group consisting of an oxide material and an up-converting fluorescent nano material matrix. Material or polymer material.
- the surface modifying agent in the step of surface modifying the nano material particles with a surface modifying agent, may be a mercapto group-containing organic ligand, an amine group-containing organic ligand, a carboxylic acid, and One or more of a carboxylic acid derivative organic ligand, an amphiphilic polymer, and the like.
- the present invention employs a mercapto group-containing organic ligand, an amine group-containing organic ligand, a carboxylic acid, and a carboxylic acid derivative organic ligand or an amphiphilic polymer to surface-modify the spacer layer of the nanomaterial particles.
- the spacer layer of the nano material particles is surface-modified by using a surface modifying agent containing the above group is that the metal element on the surface of the quantum dot and the groups in the organic ligand (such as an amine group, a carboxyl group, a thiol group, etc.) are easily Combined, under certain conditions, quantum dots can be combined on the isolation layer to form a quantum dot composite.
- a surface modifying agent containing the above group is that the metal element on the surface of the quantum dot and the groups in the organic ligand (such as an amine group, a carboxyl group, a thiol group, etc.) are easily Combined, under certain conditions, quantum dots can be combined on the isolation layer to form a quantum dot composite.
- the core particles have a size of 7-20 nm and the spacer layer has a thickness of 2-20 nm, preferably 5-15 nm, more preferably 8-12 nm.
- the present invention allows the quantum dot composite to emit light of different wavelengths by varying the size of the different types of quantum dots.
- the selection of the material of the core particle material, the spacer layer material, and the sub-material layer layered to form the spacer layer is as described above, and details are not described herein again.
- the thiol-containing organic ligand may be one or more of benzyl mercaptan, thioglycolic acid (TGA), and mercaptopropionic acid.
- the amine group-containing organic ligand may be ethylenediamine, octadecyl-p-vinylbenzyl-dimethylammonium chloride (OVDAC), N,N-dimethyl One or more of benzylamine, L-cysteine (L-Cys), reduced glutathione (GSH), bovine serum albumin (BSA), and the like.
- the organic ligand of the carboxylic acid and the carboxylic acid derivative may be methylhexahydroindolic acid anhydride, o-dicarboxylic acid anhydride, sodium polyacrylate, poly(acrylic acid-maleic anhydride). One or more of them.
- the amphiphilic polymer may be polyvinylpyrrolidone (PVP), polydimethylsiloxane (PMDS), polyethyleneimine (BPEI), amine-terminated polyethylene glycol, One or more of sulfopolyaniline and the like.
- PVP polyvinylpyrrolidone
- PMDS polydimethylsiloxane
- BPEI polyethyleneimine
- amine-terminated polyethylene glycol One or more of sulfopolyaniline and the like.
- NaYF 4 Er 3+ / Yb 3+ @NaYF 4 replacing step 2) in NaYF 4: Er 3+ / Yb 3+ , repeat steps 1) -3), to give NaYF 4: Er 3 + /Yb 3+ @2NaYF 4 ;
- step 5) Repeat the steps 1) to 3) according to the method of step 4) to obtain nano material particles NaYF 4 :Er 3+ /Yb 3+ @mNaYF 4 , m are 1, 2, 3, 4 , respectively.
- the fluorescence spectrum of the corresponding NaYF 4 :Er 3+ /Yb 3+ @mNaYF 4 at 5 o'clock is shown in Fig. 1. It can be seen from Fig. 1 that only the spacer layer is coated to greatly increase the luminous intensity of the core, thereby better transmitting. Energy to quantum dots;
- steps 1)-4) repeating the operation of steps 1)-4) a plurality of times to obtain nano material particles NaYF 4 :Er 3+ /Yb 3+ @mNaGdF 4 /NaYF 4 ;
- the method for preparing a quantum dot composite of the present embodiment comprises the steps of: (1) synthesis of In 2 O 3 :Er 3+ /Yb 3+ @mIn 2 O 3 /Y 2 O 3 , wherein m is 2-10 Natural number:
- In(OH) 3 Er 3+ /Yb 3+ @mIn(OH) 3 /Y(OH) 3 is placed in a muffle furnace, calcined at 500 ° C for 3 h, cooled and ground to obtain In 2 O 3 : Er 3+ /Yb 3+ @mIn 2 O 3 /Y 2 O 3 ;
- step 2) 0.3mL CO-520 and 0.06mL 30% ammonia water was added to the solution of step 1), sealed ultrasonic for 20min, forming a transparent emulsion;
- steps 1)-4 repeating the operation of steps 1)-4), obtaining nano material particles NaSrF 4 : Tm 3+ /Nd 3+ /Yb 3+ @mSiO 2 /NaSrF 4 ;
- steps 1)-5) repeating the operations of steps 1)-5) several times to obtain nano material particles NaSrF 4 : Tm 3+ /Nd 3+ /Yb 3+ @mNaSrF 4 /polytrimethylolpropane triacrylate;
- Y(OH) 3 :Er 3+ /Yb 3+ is placed in a muffle furnace, calcined at 600 ° C for 1 h, cooled and ground to obtain Y 2 O 3 :Er 3+ /Yb 3+ ;
- step 3 take 1mL of the above step 2) Titanium amino alcohol complex solution slowly dropwise into the above step 1) solution, after the completion of the addition, stir the reaction for 25h; then obtain a solid by centrifugation, drying at 100 ° C for 24h, Calcined at 450 ° C for 0.5 h in a muffle furnace to obtain Y 2 O 3 :Er 3+ /Yb 3+ @TiO 2 ;
- step 2) 0.4mL CO-520 and 0.08mL 30% ammonia water was added to the solution of step 1), and sealed for 20 minutes to form a transparent emulsion;
- the black precursor is placed in a muffle furnace, pre-fired at 500 ° C for 5 h, cooled and ground, calcined at 700 ° C for 5 h, finally obtained upconversion fluorescent nanomaterial LiGd (MoO 4 ) 2 : Er 3 + / Yb 3 + ;
- the method for preparing a quantum dot composite of the present embodiment includes the steps of:
- step 2) 0.4mL CO-520 and 0.08mL 30% ammonia water was added to the solution of step 1), and sealed for 20 minutes to form a transparent emulsion;
- step 2) 0.2mL CO-520 and 0.05mL 30% ammonia water was added to the solution of step 1), sealed ultrasonic for 20min, forming a transparent emulsion;
- step 2) 0.6mL CO-520 and 0.15mL 30% ammonia water was added to the solution of step 1), and sealed for 20 minutes to form a transparent emulsion;
- step 3 adding 0.08m LTEOS to the above step 2) emulsion, stirring at 600 rpm for 50 h;
- step 2) 0.5mL CO-520 and 0.12mL 30% ammonia water was added to the solution of step 1), sealed ultrasonic for 20min, forming a transparent emulsion;
- CTMAB cetyltrimethylammonium ammonium bromide
- step 2) 0.4mL CO-520 and 0.08mL 30% ammonia water was added to the solution of step 1), and sealed for 20 minutes to form a transparent emulsion;
- nano material particles NaGdF 4 Tm 3+ /Yb 3+ /Nd 3+ @SiO 2 /Al 2 O 3 ;
- the present invention provides a quantum dot composite material and a preparation method thereof.
- the above-mentioned converted fluorescent nano material is a core, and the up-converting fluorescent nano material is coated with an isolation layer, and quantum dots are combined outside the isolation layer to form a quantum dot composite material.
- Adding the isolation layer between the upconverting fluorescent nanomaterial and the quantum dot is for separating the quantum dot and the upconverting fluorescent nano material, avoiding the quantum dot and the upconverting fluorescent nano material directly Contact causes a lossy surface wave.
- the upconverting fluorescent nanomaterial is excited by infrared light, and the upconversion of the upconverting fluorescent nanomaterial is utilized to convert the infrared light into visible radiation, and the quantum dot luminescence is excited by the energy transfer to achieve the infrared light excitation quantum dot.
- the purpose of illuminating improves the utilization of infrared light, and avoids the problems of direct oxidation of quantum dots on the surface of quantum dots and local sintering.
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Abstract
Description
Claims (25)
- 一种量子点复合材料,其特征在于,包括:核,所述核的材料为上转换荧光纳米材料;间隔层,所述间隔层包覆所述核;量子点,所述量子点结合在所述间隔层表面;其中,所述间隔层用于降低所述上转换荧光纳米材料向所述量子点传递能量时的非辐射衰减速率。
- 根据权利要求1所述的量子点复合材料,其特征在于,所述间隔层的总厚度记为d,d为5-20nm。
- 根据权利要求2所述的量子点复合材料,其特征在于,d为5-15nm。
- 根据权利要求3所述的量子点复合材料,其特征在于,d为8-12nm。
- 根据权利要求1所述的量子点复合材料,其特征在于,所述间隔层由2-10层子材料层层叠形成。
- 根据权利要求1所述的量子点复合材料,其特征在于,所述间隔层与所述量子点结合的表面结合有表面修饰剂。
- 根据权利要求6所述的量子点复合材料,其特征在于,所述表面修饰剂选自含巯基的有机配体、含胺基的有机配体、羧酸及羧酸衍生物有机配体和双亲聚合物中的一种或多种。
- 根据权利要求1所述的量子点复合材料,其特征在于,用作所述核的上转换荧光纳米材料为激活剂掺杂的上转换荧光纳米材料基质材料;或者,用作所述核的所述上转换荧光纳米材料为激活剂和敏化剂掺杂的上转换荧光纳米材料基质材料;其中,用作所述核的激活剂掺杂的上转换荧光纳米材料基质材料中,所述上转换荧光纳米材料基质材料选自氟化物上转换荧光纳米材料基质材料、氧化物上转换荧光纳米材料基质材料和复合氧化物上转换荧光纳米材料基质材料中的一种;用作所述核的激活剂和敏化剂掺杂的上转换荧光纳米材料基质材料中,所述上转换荧光纳米材料基质材料选自氟化物上转换荧光纳米材料基质材料、氧化物上转换荧光纳米材料基质材料和复合氧化物上转换荧光纳米材料基质材料中的一种。
- 根据权利要求8所述的量子点复合材料,其特征在于,用作所述核的所述上转换荧光纳米材料为激活剂掺杂的上转换荧光纳米材料基质材料,其中,所述激活剂选自Tm 3+、Er 3+、Pr 3+、Nd 3+、Sm 3+、Ho 3+、Ti 2+、Cr 3+、Ni 2+、Mo 3+、Re 4+和Os 4+中的一种或多种;或者,用作所述核的所述上转换荧光纳米材料为激活剂和敏化剂掺杂的上转换荧光纳米材料基质材料,其中,所述激活剂选自Tm 3+、Er 3+、Pr 3+、Nd 3+、Sm 3+、Ho 3+、Ti 2+、Cr 3+、Ni 2+、Mo 3+、Re 4+和Os 4+中的一种或多种;所述敏化剂为Yb 3+。
- 根据权利要求1至9任一项所述的量子点复合材料,其特征在于,用作所述间隔层的材料为上转换荧光纳米材料基质材料、氧化物材料或聚合物材料。
- 根据权利要求10所述的量子点复合材料,其特征在于,用作所述间隔层的材料的上转换荧光纳米材料基质材料选自氟化物上转换荧光纳米材料基质材料、氧化物上转换荧光纳米材料基质材料和复合氧化物上转换荧光纳米材料基质材料中的一种。
- 根据权利要求11所述的量子点复合材料,其特征在于,用作所述间隔层材料的上转换荧光纳米材料基质材料选自氟化物上转换荧光纳米材料基质材料中的一种或几种。
- 根据权利要求12所述的量子点复合材料,其特征在于,所述间隔层由2-10层子材料层层叠形成,用作所述各子材料层的材料独立地为相同或不同的上转换荧光纳米材料基质材料。
- 根据权利要求10所述的量子点复合材料,其特征在于,用作所述间隔层的材料的氧化物材料选自SiO 2、Fe 3O 4、Al 2O 3或TiO 2。
- 根据权利要求14所述的量子点复合材料,其特征在于,所述间隔层由2-10层子材料层层叠形成,所述各子材料层的材料独立地为相同或不同的氧化物材料。
- 根据权利要求10所述的量子点复合材料,其特征在于,用作所述间隔层的材料的聚合物材料选自聚苯乙烯-马来酐、聚苯乙烯-丙烯酸丁酯、聚苯乙烯-丙烯腈、硝化纤维素、端羟基聚丁二烯、聚丙烯酸-丙烯酸丁酯、聚丙烯酸-苯乙烯、聚三羟甲基丙烷三丙烯酸酯、聚甲基丙烯酸甲酯和聚酰胺-胺中的一种。
- 根据权利要求16所述的量子点复合材料,其特征在于,所述间隔层由 2-10层子材料层层叠形成,所述各子材料层的材料独立地为相同或不同的聚合物材料。
- 根据权利要求5所述的量子点复合材料,其特征在于,所述各子材料层的材料独立地选自氧化物材料、上转换荧光纳米材料基质材料和聚合物材料中的两种或三种。
- 根据权利要求18所述的量子点复合材料,其特征在于,用作所述间隔层各子材料层的材料的上转换荧光纳米材料基质材料选自氟化物上转换荧光纳米材料基质材料、氧化物上转换荧光纳米材料基质材料和复合氧化物上转换荧光纳米材料基质材料中的一种;和/或,用作所述间隔层的各子材料层的氧化物材料选自SiO 2、Fe 3O 4、Al 2O 3或TiO 2;和/或,用作所述间隔层的各子材料层的聚合物材料选自聚苯乙烯-马来酐、聚苯乙烯-丙烯酸丁酯、聚苯乙烯-丙烯腈、硝化纤维素、端羟基聚丁二烯、聚丙烯酸-丙烯酸丁酯、聚丙烯酸-苯乙烯、聚三羟甲基丙烷三丙烯酸酯、聚甲基丙烯酸甲酯和聚酰胺-胺中的一种。
- 根据权利要求19所述的量子点复合材料,其特征在于,包覆所述核的第一层子材料层的材料为上转换荧光纳米材料基质材料,第二层子材料层包覆所述第一层子材料层,每种在后的子材料层包覆在前的子材料层,形成所述间隔层,所述第二层子材料层至最后一层子材料层的材料独立地选自氧化物材料、上转换荧光纳米材料基质材料或聚合物材料。
- 一种量子点复合材料的制备方法,其特征在于,包括步骤:提供一种核颗粒,所述核颗粒的材料为上转换荧光纳米材料;在所述核颗粒表面包覆形成所述间隔层,得到间隔层包覆的纳米材料颗粒;采用表面修饰剂对所述纳米材料颗粒进行表面修饰,得到经表面修饰的所述纳米材料颗粒;将分散有经表面修饰的所述纳米材料颗粒的溶液与量子点溶液混合,使量子点结合在所述间隔层表面,得到所述量子点复合材料;所述间隔层用于降低所述上转换荧光纳米材料向所述量子点传递能量时的非辐射衰减速率。
- 根据权利要求21所述的制备方法,其特征在于,在所述核颗粒表面包覆形成所述间隔层的步骤中,包覆形成由2-10层子材料层层叠形成间隔层,其中第一层子材料层包覆所述核,第二层子材料层包覆所述第一层子材料层,每种在后的子材料层包覆在前的子材料层,形成所述间隔层。
- 根据权利要求22所述的制备方法,其特征在于,所述用作各子材料层的材料独立地为相同或不同的上转换荧光纳米材料基质材料。
- 根据权利要求22述的制备方法,其特征在于,包覆所述核的第一层子材料层的材料为上转换荧光纳米材料基质材料,第二层子材料层包覆所述第一层子材料层,每种在后的子材料层包覆在前的子材料层,形成所述间隔层,所述第二层子材料层至最后一层子材料层的材料独立地选自氧化物材料、上转换荧光纳米材料基质材料或聚合物材料。
- 根据权利要求21所述的量子点复合材料的制备方法,其特征在于,所述表面修饰剂选自含巯基的有机配体、含胺基的有机配体、羧酸及羧酸衍生物有机配体和双亲聚合物中的一种或多种;其中,所述含巯基的有机配体选自苄硫醇、巯基乙酸和巯基丙酸中的一种或多种;所述含胺基的有机配体选自乙二胺、十八烷基-对乙烯苄基-二甲基氯化铵、N,N-二甲基苄胺、L-半胱氨酸、还原型谷胱甘肽和牛血清蛋白中的一种或多种;所述羧酸及羧酸衍生物有机配体选自甲基六氢邻笨二甲基酸酐、邻笨二甲酸酐、聚丙烯酸钠和聚(丙烯酸-马来酸酐)中的一种或多种;所述双亲聚合物可以为聚乙烯吡咯烷酮、聚二甲基硅氧烷、聚乙烯亚胺、胺基封端的聚乙二醇、磺基聚苯胺中的一种或多种。
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