Y2O3:RE nanoparticles

Abstract

The present invention provides cubic crystalline structure Y2O3:RE nanoparticles, where RE is a trivalent rare earth metal ion. The present invention also provides a method for producing Y2O3:RE nanoparticles, comprising the steps of: a) providing a mixture containing (i) an yttrium salt and / or yttrium alkoxide, (ii) a rare earth metal salt and / or rare earth metal alkoxide, and (iii) an organic solvent; b) optionally subjecting the mixture to a pretreatment step, including heating the mixture to at least 80°C or a temperature at which water of crystallization and / or organic impurities are removed; c) heating the mixture to 220°C to 320°C and / or a temperature at which a precursor complex is formed; d) subjecting the mixture to a precipitation step, wherein a precipitate is formed, preferably including cooling the mixture and / or adding an anti-solvent to the mixture; and e) heating the precipitate at 600°C to 900°C and / or a temperature at which a Y2O3 cubic crystalline structure is formed, preferably for at least 10 minutes.

Description

[Technical Field]

[0001] The present invention relates to Y2O3:RE nanoparticles, a method for producing Y2O3:RE nanoparticles, and a composition containing Y2O3:RE nanoparticles. [Background technology]

[0002] Light-emitting downconversion materials play a crucial role in solid-state lighting devices such as luminaires and displays.

[0003] Y2O3:Eu is a well-known material, measured in microns, used in applications such as fluorescent tubes.

[0004] International Publication No. 2012 / 091778 discloses the production of spherical hexagonal crystals of Y2O3:Yb,Er with respect to monodisperse particles with uniform shape and size, and their shape-directed self-assembly. Spherical hexagonal crystals indicate that the crystal structure of the material is hexagonal.

[0005] International Publication No. 2018 / 167266 discloses a composition comprising an emissive material and a sensitizing material, wherein the emissive material and the sensitizing material are selected such that the sensitizing material has an emission spectrum that at least partially overlaps with one or more excitation bands of the emissive material, and the emissive material and the sensitizing material are arranged relative to each other to allow non-radiative energy transfer from the sensitizing material to the emissive material. The application also describes a method for manufacturing the same.

[0006] Non-radiative energy transfer from a sensitizing material to a luminescent material (sometimes called fluorescence resonance energy transfer, or FRET) involves the non-radiative transfer of energy from excited sensitizing ions in the sensitizing material to acceptor (or luminescent) ions in the luminescent material. This is demonstrated by the fact that selective excitation of sensitizing ions in the sensitizing material increases the emission from luminescent ions in the luminescent material.

[0007] Nanomaterials are attracting attention because of their large surface area and small volume, and interparticle FRET can be utilized by spatially arranging luminescent materials in close proximity. [Overview of the project]

[0008] The present invention provides cubic Y2O3:RE nanoparticles in which RE is a trivalent rare earth ion.

[0009] In this invention, a) A step of preparing a mixture comprising (i) a yttrium salt and / or yttrium alkoxide, (ii) a rare earth metal salt and / or rare earth metal alkoxide, and (iii) an organic solvent; b) In some cases, the mixture is subjected to a pretreatment step which includes heating to at least 80°C or a temperature at which crystal water and / or organic impurities are removed. c) Heating the mixture to 220°C to 320°C and / or a temperature at which the precursor complex is formed; d) A step of subjecting the mixture to a precipitation step in which a precipitate is formed, wherein the step preferably includes cooling the mixture and / or adding a poor solvent to the mixture; and e) Heating the precipitate at 600°C to 900°C and / or at a temperature at which a Y2O3 cubic crystal structure is formed, preferably for at least 10 minutes. A method for producing Y2O3:RE nanoparticles, including the one described, is also provided.

[0010] The present invention further provides a light-emitting composition comprising a first light-emitting material capable of emitting light of a first wavelength and a second light-emitting material capable of absorbing light of a second wavelength, having an emission spectrum that at least partially overlaps with one or more excitation bands of the first light-emitting material, wherein at least one of the first light-emitting material or the second light-emitting material comprises nanoparticles of the present invention.

[0011] The nanoparticles of the present invention exhibit good absorption / luminescence properties and are suitable for mixing into luminescent compositions. They have few crystal defects, are small in size, and are highly crystalline. They can be advantageously used in compositions where non-radiative energy transfer (fluorescence resonance energy transfer, sometimes called FRET) is desired.

[0012] The method of the present invention makes it possible to obtain the nanoparticles of the present invention. [Brief explanation of the drawing]

[0013] [Figure 1] Figure 1 shows the emission spectrum of the Y2O3:Eu3+ precursor complex excited at 395 nm. [Figure 2] Figure 2 shows the X-ray diffraction pattern (XRD) of the Y2O3:Eu3+ precursor complex. [Figure 3] Figure 3 shows the emission spectrum of a Y2O3:Eu3+ nanoplatelet excited at 395 nm. [Figure 4] Figure 4 shows the XRD of the Y2O3:Eu3+ nanoplatelet. [Figure 5] Figure 5 shows the emission spectrum of a Y2O3:Tb3+ nanoplatelet excited at 488 nm. [Figure 6] Figure 6 shows the XRD of the Y2O3:Tb3+ nanoplatelet. [Figure 7] Figure 7 shows the emission spectra of a mixture of Y2O3:Eu3+ nanoplatelets and LaPO4:Tb3+ nanoplatelets mixed in a 1:1 weight ratio, and of a pure Y2O3:Eu3+ nanoplatelet. Excitation was performed at 486 nm. [Figure 8] Figure 8 shows the excitation spectra of a mixture of Y2O3:Eu3+ nanoplatelets and LaPO4:Tb3+ nanoplatelets mixed in a 1:1 weight ratio, and of a pure Y2O3:Eu3+ nanoplatelet. Emission is observed at 700 nm. [Figure 9] Figure 9 shows the luminescence decay of the Y2O3:Eu3+ nanoplatelet. Excitation occurs at 465 nm, and emission occurs at 610 nm. [Figure 10] Figure 10 shows the luminescence decay of a mixture of Y2O3:Eu3+ nanoplatelets and LaPO4:Tb3+ nanoplatelets mixed in a 1:1 weight ratio. Excitation occurs at 488 nm, and emission occurs at 610 nm. [Figure 11]Figure 11 shows the emission spectra of a mixture of Y2O3:Eu3+ nanoplatelets and YAG:Tb3+ nanoplatelets mixed in a 1:1 weight ratio, and of a pure Y2O3:Eu3+ nanoplatelet. Excitation is performed at 488 nm. [Figure 12] Figure 12 shows the excitation spectra of a mixture of Y2O3:Eu3+ nanoplatelets and YAG:Tb3+ nanoplatelets mixed in a 1:1 weight ratio, and of a pure Y2O3:Eu3+ nanoplatelet. Emission occurs at 698 nm. [Figure 13] Figure 13 shows the emission spectra of a mixture of Y2O3:Eu3+ nanoplatelets and YAG:Tb3+,Ce3+ nanoplatelets mixed in a 1:1 weight ratio. Excitation was performed at 440 nm. [Figure 14] Figure 14 shows a TEM image of the product from Example 1. [Modes for carrying out the invention]

[0014] nanoparticles The nanoparticles of the present invention are cubic Y2O3:RE nanoparticles, where RE is a trivalent rare earth ion.

[0015] The cubic crystal structure has been found to provide good absorption / luminescence properties.

[0016] Preferably, RE is a europium(III) or terbium(III) ion or a combination thereof. 3+ It exhibits red emission upon appropriate excitation. Tb 3+ It exhibits yellow-green emission upon appropriate excitation.

[0017] Preferably, in the case of europium-doped nanoparticles, the doping rate is at least 10%, and more preferably 15% to 80%. In this specification, the doping rate is the ratio of doping ions to the total of doping ions and yttrium atoms in the crystal lattice.

[0018] Preferably, in the case of terbium-doped nanoparticles, the doping rate is at least 15%, and more preferably, the doping rate is 30% to 80%.

[0019] Preferably, in the case of nanoparticles co-doped with both europium and terbium, the doping rate of europium is 15% to 50%, and the doping rate of terbium is at least 15%.

[0020] The nanoparticles of the present invention include particles whose dimension in at least one direction is on the nanometer scale, preferably 100 nm or less. Preferably, the nanoparticles of the present invention have a dimension in at least one direction of 70 nm or less. Furthermore, the minimum dimension D of the nanoparticles 50 The value, when measured by a transmission electron microscope (TEM), is preferably 0.5 nm to 100 nm, more preferably 0.5 nm to 50 nm, and most preferably 0.5 nm to 10 nm. 50 This represents the median of the smallest dimensions of the nanoparticles, measured from at least 50 representative particles.

[0021] Preferably, the nanoparticles are nanoplatelets. The term nanoplatelets, as known to those skilled in the art, encompass particles whose lateral dimension is larger than their thickness (minimum dimension). For example, a nanoplatelet may be a nanoparticle in which the dimensions in at least one direction other than the minimum dimension, preferably two directions, are at least 5 times, preferably at least 10 times, the minimum dimension of the particle. A nanoplatelet may, for example, have a size of 5 nm to 500 nm, preferably 50 nm to 500 nm, in at least one direction, preferably two directions, and a thickness of 0.5 nm to 10 nm.

[0022] Preferably, the dimension of the platelet in one direction is between 0.5 nm and 10 nm, as measured by a transmission electron microscope (TEM).

[0023] Preferably, the nanoparticles of the present invention are luminescent.

[0024] Preferably, the Y2O3:RE nanoparticles of the present invention can emit light in red and / or green. In this specification, the term red-emitting material refers to a material having one or more emission bands between 600 nm and 700 nm upon appropriate excitation. In this specification, the term green-emitting material refers to a material having one or more emission bands between 510 nm and 560 nm upon appropriate excitation.

[0025] More preferably, the Y2O3:RE nanoparticles of the present invention (where RE is europium, terbium, or both europium and terbium) can emit red and / or green light.

[0026] Manufacturing method This invention provides a method for producing Y2O3:RE nanoparticles.

[0027] The method of the present invention can be used to obtain the nanoparticles of the present invention.

[0028] Stage a) The present invention provides a method for producing Y2O3:RE nanoparticles, comprising the steps of preparing a mixture comprising (i) a yttrium salt and / or yttrium alkoxide, (ii) a rare earth metal salt and / or rare earth metal alkoxide, and (iii) an organic solvent.

[0029] The rare earth metal ion (RE) is preferably europium(III) and / or terbium(III).

[0030] Suitable yttrium salts and / or alkoxides that dissolve in organic solvents, as well as rare earth metal salts and / or alkoxides, may be used.

[0031] Preferably, the yttrium salt is selected from the group consisting of halides, acetates, acetylacetonates, sulfates, nitrates, and / or hydrates of these substances.

[0032] Preferably, the yttrium alkoxide is of the formula Y(OR)3, where RO - is an alkoxide and R is a C1-C4 group). Preferably, the alkoxide is isopropoxide, ethoxide and / or tert-butoxide.

[0033] Preferably, the rare earth metal salt is selected from the group consisting of halides, acetates, acetylacetonates, sulfates, nitrates and / or hydrates of these substances.

[0034] Preferably, the rare earth metal alkoxide is of the formula RE(OR)3, where RO - is an alkoxide and R is a C1-C4 group). Preferably, the alkoxide is isopropoxide, ethoxide and / or tert-butoxide.

[0035] One skilled in the art can determine the amounts of the salt and / or alkoxide such that the desired ratio of ions in the nanoparticles is obtained.

[0036] The mixture contains an organic solvent. The organic solvent is preferably a high-boiling solvent. The boiling point of the organic solvent is preferably at least 220 °C at a pressure of 10 5 Pa, more preferably at least 260 °C at a pressure of 10 5 Pa, more preferably at least 320 °C at a pressure of 10 5 Pa, or higher than the temperature of at least steps b) and c). The organic solvent is selected from the group of 1-octadecene, oleylamine, octadecylamine, oleic acid or mixtures thereof. The mixing ratio is preferably 0.1-1 mmol of salt per 20 mL of solvent.

[0037] Step b) The method of the present invention may optionally include subjecting the mixture to a pretreatment step that includes heating the mixture to at least 80 °C or to a temperature at which the water of crystallization and / or organic impurities are removed.

[0038] The pretreatment step aims to remove crystal water and other impurities from the salt and solvent in the mixture. This can be done at a temperature suitable for achieving this objective.

[0039] The mixture may be heated to at least 80°C. The temperature may be about 100°C under atmospheric pressure or at least about 80°C under vacuum, and / or a temperature at which impurities are removed. Heat the mixture to at least the temperature at which water evaporates. For example, at atmospheric pressure, heat the mixture to at least 100°C.

[0040] Preferably, the mixture is heated to about 100°C to about 180°C under atmospheric pressure, or to about 80°C to about 130°C under vacuum. This allows for the removal of crystal water and other impurities from the mixture.

[0041] Preferably, the mixture is heated for at least 10 minutes, more preferably 10 to 420 minutes, or for a time sufficient to remove impurities. If the quantity is large, the pretreatment step may be longer.

[0042] Stage c) The method of the present invention includes the step of heating the mixture to 220°C to 320°C and / or a temperature at which a precursor complex is formed.

[0043] Preferably, the mixture is heated for at least about 15 minutes. More preferably, the mixture is heated for about 30 minutes to about 120 minutes, which may be longer if the quantity is large.

[0044] The mixture may be heated under inert conditions, but this is not essential. While not strictly theoretical, it is thought that the precursor complex is formed during this heating process.

[0045] Stage d) The method of the present invention includes the step of subjecting the mixture to a precipitation step in which a precipitate is formed, preferably including cooling the mixture and / or adding a poor solvent to the mixture. Preferably, the poor solvent is a polar organic solvent, more preferably an alcohol or a ketone, still more preferably a C1-C4 alcohol or a ketone, and even more preferably methanol, ethanol, propanol or acetone. The addition of the poor solvent promotes precipitation and facilitates the separation of the precipitate. Preferably, the boiling point of the poor solvent is relatively low, which promotes the removal of the liquid in a subsequent step.

[0046] In the precipitation step, a precipitate is formed. The precipitate may be separated by means known in the art that enable sedimentation, centrifugation, or filtration of the precipitate.

[0047] Preferably, the separated precipitate is dried. This enables reaching the desired temperature in a rapid and controlled manner in step e).

[0048] Step e The method of the present invention includes the step of heating the precipitate at 600°C to 900°C and / or at a temperature at which a Y2O3 cubic crystal structure is formed, preferably for at least 10 minutes.

[0049] Preferably, the precipitate is heated for at least 5 minutes, preferably about 10 minutes, more preferably about 10 minutes to 60 minutes.

[0050] Without being bound by theory, the heating step is considered to enable the material to crystallize into the desired cubic crystal structure.

[0051] Luminescent composition and method for producing the same The present invention also provides a luminescent composition containing the nanoparticles of the present invention.

[0052] Preferably, the luminescent composition contains a first luminescent material and a second luminescent material, and at least one of the first luminescent material or the second luminescent material contains the nanoparticles of the present invention.

[0053] Preferably, the luminescent composition includes a first luminescent material capable of emitting light of a first wavelength and a second luminescent material capable of absorbing light of a second wavelength, and has an emission spectrum that at least partially overlaps with one or more of the excitation bands of the first luminescent material.

[0054] The first luminescent material is capable of emitting light of a first wavelength. Those skilled in the art will understand that the first luminescent material functions as a luminescent material in the composition of the present invention. The first wavelength may be any wavelength of interest. Preferred wavelengths are described below.

[0055] The second luminescent material is capable of absorbing light of a second wavelength. Those skilled in the art will understand that the second luminescent material functions as a sensitizing material in the present invention. The second wavelength may be any wavelength of interest. Preferred wavelengths are described below.

[0056] When the second luminescent material is excited by light of the second wavelength, it has an emission spectrum that at least partially overlaps with one or more of the excitation bands of the first luminescent material. Those skilled in the art can sufficiently determine the spectral overlap based on spectra known in the art or by determining the spectrum through routine experiments such as those disclosed in WO 2020 / 053429.

[0057] Preferably, the overlap between the emission spectrum of the second material and one or more of the excitation bands of the first material is at a wavelength of blue (440 - 480 nm), green (510 - 560 nm) or yellow (560 - 580 nm).

[0058] Preferably, the first luminescent material (emitter material) and the second luminescent material (sensitizer material) are arranged relative to each other to allow non-radiative energy transfer (fluorescence resonance energy transfer, sometimes called FRET) from the second luminescent material to the first luminescent material. Generally, this involves the first and second luminescent materials being very close together, for example, within about 0.5 nm to about 20 nm. Those skilled in the art are well aware of how non-radiative energy transfer occurs. This is described, for example, in International Publication No. 2018 / 167266, the contents of which are incorporated herein by reference. Those skilled in the art understand that non-radiative energy transfer involves the non-radiative transfer of energy from the excited sensitizer material to acceptor (or luminescent material) ions in the luminescent material. This is demonstrated by increased selective excitation of the sensitizer material and increased emission from the luminescent ions in the luminescent material. The non-radiative energy transfer in question may arise from Förster-type or Dexter-type energy transfer. Since resonance energy transfer is inversely proportional to the sixth power of the interion distance (in the case of Förster-type energy transfer) or exponentially proportional to the distance (in the case of Dexter-type energy transfer), those skilled in the art will understand that a configuration enabling non-radiative energy transfer may be achieved by appropriately designing the effective distance between the sensitizing material and the luminescent ions in the luminescent material.

[0059] The first and / or second luminescent material is Y2O3:RE nanoparticles. This increases the contact surface area between the first and second materials and (further) enables the generation of non-radiative energy transfer. The Y2O3:RE nanoparticles have desirable luminescence properties.

[0060] Preferably, the first luminescent material is Y2O3:RE nanoparticles or the nanoplatelets of the present invention. The Y2O3:RE nanoparticles of the present invention are very suitable for use in luminescent compositions. More preferably, RE is europium(III), terbium(III), or europium(III) and terbium(III). These ions have desirable absorption / emission properties.

[0061] Preferably, the first and second light-emitting materials are in the form of nanoparticles. Suitable nanoparticles include particles with dimensions in at least one direction on the nanometer scale, preferably 100 nm or less. The small size reduces the distance between the surfaces of the first and second materials, and (furthermore) allows for the occurrence of non-radiative energy transfer between particles. Providing both materials in the form of nanoparticles allows for more efficient mixing and uniform dispersion of the particles, further promoting non-radiative energy transfer between particles.

[0062] As discussed, the minimum size of the nanoparticles is D 50 The value, when measured by a transmission electron microscope (TEM), is preferably 0.5 nm to 100 nm, more preferably 0.5 nm to 50 nm, and most preferably 0.5 nm to 10 nm. 50 This represents the median value for the minimum size of nanoparticles, obtained by measuring at least 50 particles in total.

[0063] In another preferred embodiment, the second light-emitting material is provided as a bulk material together with the first light-emitting material on the second light-emitting material, where the term “bulk” means, in particular, beyond the nanometer scale, for example, having a diameter greater than 100 nm and including and / or including the micrometer scale.

[0064] First luminescent material As discussed, the second light-emitting material may include the nanoparticles of the present invention. In a composition in which the second light-emitting material includes the nanoparticles of the present invention, the first light-emitting material is preferably as described below.

[0065] The first light-emitting material can emit light of a first wavelength. The first wavelength may be any wavelength of interest.

[0066] Preferably, the first light-emitting material includes a red or green light-emitting material. In this specification, the term "red light-emitting material" refers to a material having one or more emission bands of 600 nm to 700 nm upon appropriate excitation, and the term "green light-emitting material" refers to a material having one or more emission bands of 510 nm to 560 nm upon appropriate excitation. Providing a red or green light-emitting material may be desirable for color rendering. According to another aspect of the present invention, the first light-emitting material is a material having one or more emission bands of 700 to 1400 nm (IR-A), 580 to 600 nm (amber and / or orange), 560 to 580 nm (yellow), 480 to 510 nm (cyan), 440 to 480 nm (blue), 400 to 440 nm (violet), 315 to 400 nm (UV-A), and / or 280 to 315 nm (UV-B) upon appropriate excitation.

[0067] In a preferred embodiment, the first luminescent material includes a rare-earth doped phosphor material. The phosphor material may be a divalent or trivalent rare-earth doped phosphor. Examples of suitable rare-earth doped phosphor materials include LaPO4:Eu 3+ (and / or Tb 3+ ), CaAlSiN3:Eu 2+ Y2O3:Eu 3+ (and / or Tb 3+ ), Y(V,P)O4:Eu 3+ (and / or Tb 3+ ), Lu3Al5O 12 :Ce 3+ (or Eu 3+ and / or Tb 3+ ), Y3Al5O 12 :Ce 3+ (or Eu 3+ and / or Tb 3+ ), BaMgAl 14 O 23 :Mn 2+ Mg(Al,Ga)2O4:Mn 2+ Zn2SiO4:Mn 2+ K2SiF6:Mn 4+ MgF2.GeO2:Mn 4+ This includes, but is not limited to, combinations thereof.

[0068] The phosphor material may be available on the market today, or it may be synthesized, for example, as described in Riwotzki, K.; Meyssamy, H.; Kornowski, A.; Haase, MJ Phys. Chem. B. 2000, 104, 2824-2828.

[0069] As is known to those skilled in the art, rare-earth doped phosphor materials include a host lattice doped with optically active ions.

[0070] The first light-emitting material may have a suitable host lattice. The host lattice may be selected from the group consisting of, for example, oxides, fluorides, nitrides, borates, garnets, molybdates, phosphates, vanadates, chlorides, sulfides, selenides, silicates, aluminates, oxyfluorides, oxychlorides, oxynitrides, oxysulfides, oxyseleniums, fluorinated chlorides, fluorinated silicates, and fluorinated bromides, or combinations thereof, or another inorganic host material that can incorporate optically active ions.

[0071] Preferably, the host lattice of the first luminescent material is an oxide, a phosphate, a vanadate, or a combination thereof, and more preferably Y3Al5O 12 (YAG), Lu3Al5O 12 (LuAG), Y2O3, YVPO4, YVO4, or LaPO4, or combinations thereof, are selected from the group. Rather, the host grid of the preferred first luminescent material is Eu 3+ , Tb 3+ Mn 2+ and Mn 4+ The material is doped with one or more ions selected from the group consisting of the following. These ions provide good luminescence properties, such as a strong emission and / or a red or green emission band in the visible spectrum.

[0072] EU 3+In the case of doping by Tb, the first luminescent material may have a host lattice doped with, for example, a doping rate of at least 10%, more preferably 15% to 80%. 3+ In the case of doping by, for example, the first luminescent material has a doping rate of at least 15%, more preferably 30% to 80% Tb 3+ It may have a host lattice doped with a doping rate. Mn 4+ In the case of doping by Mn, the first luminescent material may have a host lattice doped with a doping rate of, for example, 0.1 to 30%, most preferably 1% to 10%. 2+ In the case of doping, the first luminescent material may have a host lattice doped with a doping rate of, for example, 0.1 to 30%, most preferably 1% to 10%.

[0073] In a typical embodiment, the first light-emitting material is (Ca,Sr)Ga2O6:Eu 3+ (or Tb 3+ ), (Ca,Sr,Ba)La2Bi2(SiO4)3O:Eu 3+ (or Tb 3+ ), (Ca,Sr,Ba)SnO3:Eu 3+ (and / or Tb 3+ ), (Ca,Y,Gd)MoO4:Eu 3+ (or Tb 3+ ), (Y,Gd)BO3 (pseudo-battlelite):Eu 3+ (or Tb 3+ ), (Y,Tb)SiO5:Eu 3+ (or Tb 3+ ), A-La2O3:Eu 3+ (or Tb 3+ ), Ba2(SiO4):O 2- :EU 3+ (or Tb 3+ ), Ba2MgSi2O7:Eu 3+ (or Tb 3+ ), Ba2Y(BO3)2Cl:Eu 3+ (or Tb 3+ ), Ba3(PO4)2:Eu 3+ (or Tb 3+ ), Ba3Ca3(PO4)4:Eu3+ (or Tb 3+ )、Ba3Gd(BO3)3:Eu 3+ (or Tb 3+ )、Ba3Gd2(BO3)4:Eu 3+ (or Tb 3+ )、Ba3La2(BO3)4:Eu 3+ (or Tb 3+ )、Ba3V2O8:Eu 3+ (or Tb 3+ )、Ba3Y2(BO3)4:Eu 3+ (or Tb 3+ )、BaB8O 13 :Eu 3+ (or Tb 3+ )、BaBPO5:Eu 3+ (or Tb 3+ )、BaFCl:Eu 3+ (or Tb 3+ )、BaGd2O4:Eu 3+ (or Tb 3+ )、BaGd4Si5O 17 :Sm:Eu 3+ (or Tb 3+ )、BaGdB9O 16 :Eu 3+ (or Tb 3+ )、BaLaB9O 16 :Eu 3+ (or Tb 3+ )、BaSO4:Eu 3+ (or Tb 3+ )、BaY2F8:Yb:Eu 3+ (or Tb 3+ )、BaY2Si3O 10 :Eu 3+ (or Tb 3+ )、BaYB9O 16 :Eu 3+ (or Tb 3+ )、BaZr(BO3)2:Eu 3+ (or Tb 3+ )、BaZrO3:Eu 3+ (or Tb 3+ )、BaZrO3:Eu 3+ (or Tb 3+ )、b-BaB2O4:Eu 3+ (or Tb 3+ )、B-Gd2O3:Eu3+ (or Tb 3+ ), Ca2Al(AlSiO7):Eu 3+ (or Tb 3+ ), Ca2Gd2(GeO4)2O:Eu 3+ (or Tb 3+ ), Ca2Gd8(SiO4)6O2:Eu 3+ (or Tb 3+ ), Ca2Gd8Si6O 26 :EU 3+ (or Tb 3+ ), Ca2La8(SiO4)6O2:Eu 3+ (or Tb 3+ ), Ca3(BO3)2:Eu 3+ (or Tb 3+ ), Ca3Al2O6:Eu 3+ (or Tb 3+ ), Ca3Gd2(BO3)4:Eu 3+ (or Tb 3+ ), Ca3La2(BO3)4:Eu 3+ (or Tb 3+ ), Ca3Y2(BO3)4:Eu 3+ (or Tb 3+ ), Ca4GdO(BO3)3:Eu 3+ (or Tb 3+ ), Ca5(PO 11 3F:Eu 3+ (or Tb 3+ ), Ca5(PO4)3Br:Eu 3+ (or Tb 3+ ), Ca5(PO4)3F:(4f position):Eu 3+ (or Tb 3+ ), Ca5(PO4)3F:(6h position):Eu 3+ (or Tb 3+ ), Ca5(PO4)3OH:Eu 3+ (or Tb 3+ ), CaBPO5:Eu 3+ (or Tb 3+ ), CaF2:Eu 3+ (or Tb 3+ ), CaLaB7O 13 :EU 3+ (or Tb 3+ ), calcite-CaCO3:Eu 3+ (or Tb3+ ), CaO:Eu 3+ (or Tb 3+ ), CaSO4:Eu 3+ (or Tb 3+ ), CaYO(BO3):Eu 3+ (or Tb 3+ ), C-Gd2O3:Eu 3+ (or Tb 3+ ), C-Lu2O3:(C2):Eu 3+ (or Tb 3+ ), C-Lu2O3:(C3i):Eu 3+ (or Tb 3+ ),Cs2NaYF6:Tm:Eu 3+ (or Tb 3+ ), C-Sc2O3:Yb:Eu 3+ (or Tb 3+ ), C-Y2O3:Eu 3+ (or Tb 3+ ),EU 3+ (or Tb 3+ )[(ttfa)3(phen)]0:Eu 3+ (or Tb 3+ ), Gd 17.33 (BO3)4(B2O5)2O 16 :EU 3+ (or Tb 3+ ), Gd2BaZnO5:Eu 3+ (or Tb 3+ ), Gd2O2(SO4):Eu 3+ (or Tb 3+ ), Gd2P4O 13 :EU 3+ (or Tb 3+ ), Gd3O4Br:Eu 3+ (or Tb 3+ ), Gd3PO7:Eu 3+ (or Tb 3+ ), Gd3Te2Li3O 12 :EU 3+ (or Tb 3+ ), Gd8P2O 17 :EU 3+ (or Tb 3+ ), GdA l3 (BO3) 4:Eu 3+ (or Tb 3+ ), GdAlO3:Eu 3+(or Tb 3+ ), GdAlO3:Eu 3+ (or Tb 3+ ), GdB3O6:Eu 3+ (or Tb 3+ ), GdBO3:Eu 3+ (or Tb 3+ ), GdGaO3:Eu 3+ (or Tb 3+ ), GdOBr:Eu 3+ (or Tb 3+ ), GdOCl:Eu 3+ (or Tb 3+ ), GdP3O9:Eu 3+ (or Tb 3+ ), GdPO4:Eu 3+ (or Tb 3+ ), I-CaB2O4:Eu 3+ (or Tb 3+ ), InBO3:Eu 3+ (or Tb 3+ ), I-SrB2O4:Eu 3+ (or Tb 3+ ), KCaGd(PO4)2:Eu 3+ (or Tb 3+ ), La 26 O 27 (BO3) 8:Eu 3+ (or Tb 3+ ), La2BaZnO5:Eu 3+ (or Tb 3+ ),La2Hf2O7:Eu 3+ (or Tb 3+ ), La2O2(SO4):Eu 3+ (or Tb 3+ ), La2O2S:Eu 3+ (or Tb 3+ ), La2W3O 12 :EU 3+ (or Tb 3+ ),La2Zr3(MoO4)9:Eu 3+ (or Tb 3+ ), La3TaO4Cl6:Eu 3+ (or Tb 3+ ),La3WO6Cl3:Eu 3+ (or Tb 3+ ), LaAlO3:Eu 3+ (or Tb3+ ), LaB3O6:Eu 3+ (or Tb 3+ ), LaBO3:Eu 3+ (or Tb 3+ ), LaF3:Eu 3+ (or Tb 3+ ), LaGaO3:Eu 3+ (or Tb 3+ ), LaMgB5O 10 :EU 3+ (or Tb 3+ ), LaOBr:Eu 3+ (or Tb 3+ ), LaOCl:Eu 3+ (or Tb 3+ ), LaOF:Eu 3+ (or Tb 3+ ), LaOI:Eu 3+ (or Tb 3+ ),LaP3O9:Eu 3+ (or Tb 3+ ), LaPO4:Eu 3+ (or Tb 3+ ), LaYO3:Eu 3+ (or Tb 3+ ), Li2Lu5O4(BO3)3:Eu 3+ (or Tb 3+ ), Li3Ba2La3(MoO4)8:Eu 3+ (or Tb 3+ ), Li3La2(BO3)3:Eu 3+ (or Tb 3+ ), Li6Gd(BO3)3:Eu 3+ (or Tb 3+ ), Li6Y(BO3)3:Eu 3+ (or Tb 3+ ), LiCaAlF6:Eu 3+ (or Tb 3+ ), LiEu 3+ (or Tb 3+ ), Mo2O8:Eu 3+ (or Tb 3+ ), LiGd6O5(BO3)3:Eu 3+ (or Tb 3+ ), LiGdF4:Eu 3+ (or Tb 3+ ), LiGdGeO4:Eu3+ (or Tb 3+ ), LiGdO2:Eu 3+ (or Tb 3+ ), LiGdSiO4:Eu 3+ (or Tb 3+ ), LiLa2O2BO3:Eu 3+ (or Tb 3+ ), LiLaGeO4:Eu 3+ (or Tb 3+ ), LiLaO2:Eu 3+ (or Tb 3+ ), LiLaP4O 12 :EU 3+ (or Tb 3+ ), LiLaSiO4:Eu 3+ (or Tb 3+ ), LiLuGeO4:Eu 3+ (or Tb 3+ ), LiLuO2:Eu 3+ (or Tb 3+ ), LiLuSiO4:Eu 3+ (or Tb 3+ ), LiScO2:Eu 3+ (or Tb 3+ ), LiSr2YO4:Eu 3+ (or Tb 3+ ), LiSrAlF6:Eu 3+ (or Tb 3+ ), LiY6O5(BO3)3:Eu 3+ (or Tb 3+ ), LiYF4:Eu 3+ (or Tb 3+ ), LiYGeO4:Eu 3+ (or Tb 3+ ), LiYO2:Eu 3+ (or Tb 3+ ), LiYSiO4:Eu 3+ (or Tb 3+ ), Lu2O2(SO4):Eu 3+ (or Tb 3+ ), Lu2Si2O7:Eu 3+ (or Tb 3+ ), Lu3Al5O 12 :EU 3+ (or Tb 3+ ), Lu3Al5O 12 :Yb:Eu3+ (or Tb 3+ ), LuBO3:Eu 3+ (or Tb 3+ ), LuBO3 (calcite): Eu 3+ (or Tb 3+ ), LuOCl:Eu 3+ (or Tb 3+ ), LuPO4:Eu 3+ (or Tb 3+ ), Mg2Gd8(SiO4)6O2:Eu 3+ (or Tb 3+ ), Mg2La8(SiO4)6O2:Eu 3+ (or Tb 3+ ), MgO:Eu 3+ (or Tb 3+ ), MgSiO3:Eu 3+ (or Tb 3+ ), Na3YSi3O9:Eu 3+ (or Tb 3+ ), Na6Gd(BO3)3:Eu 3+ (or Tb 3+ ),NaGdGeO4:Eu 3+ (or Tb 3+ ), NaGdO2:Eu 3+ (or Tb 3+ ), NaGdSiO4:Eu 3+ (or Tb 3+ ), NaLaGeO4:Eu 3+ (or Tb 3+ ), NaLaO2:Eu 3+ (or Tb 3+ ), NaLaSiO4:Eu 3+ (or Tb 3+ ),NaLuGeO4:Eu 3+ (or Tb 3+ ), NaLuSiO4:Eu 3+ (or Tb 3+ ), NaScO2:Eu 3+ (or Tb 3+ ), NaSrLa(VO4)2:Eu 3+ (or Tb 3+ ), NaYGeO4:Eu 3+ (or Tb 3+ ), NaYSiO4:Eu 3+ (or Tb 3+), ScBO3:Eu 3+ (or Tb 3+ ),ScOCl:Eu 3+ (or Tb 3+ ), ScPO4:Eu 3+ (or Tb 3+ ), Sr2B2O5:Eu 3+ (or Tb 3+ ), Sr2Gd8(SiO4)6O2:Eu 3+ (or Tb 3+ ), Sr2La2Zn2O7:Eu 3+ (or Tb 3+ ), Sr2La2Zn2O7:Eu 3+ (or Tb 3+ ), Sr2LaAlO5:Eu 3+ (or Tb 3+ ), Sr3(BO3)2:Eu 3+ (or Tb 3+ ), Sr3(PO4)2:Eu 3+ (or Tb 3+ ), Sr3(PO4)2:Sm:Eu 3+ (or Tb 3+ ), Sr3Gd2(BO3)4:Eu 3+ (or Tb 3+ ), Sr3La2(BO3)4:Eu 3+ (or Tb 3+ ), Sr3La6(SiO4)6:Eu 3+ (or Tb 3+ ), Sr3Y2(BO3)4:Eu 3+ (or Tb 3+ ), Sr5(PO4)3F:Eu 3+ (or Tb 3+ ), Sr9Ln(VO4)7:Eu 3+ (or Tb 3+ ), SrAl2B2O7:Eu 3+ (or Tb 3+ ), SrB4O7:Eu 3+ (or Tb 3+ ), SrB6O 10 :EU 3+ (or Tb 3+ ), SrCO3:Eu 3+ (or Tb 3+ ), SrGdAlO4:Eu 3+ (or Tb3+ ), SrHfO3:Tm:Eu 3+ (or Tb 3+ ), SrLa2BeO5:(4c):Eu 3+ (or Tb 3+ ), SrLa2BeO5:(8d):Eu 3+ (or Tb 3+ ), SrLaAlO4:Eu 3+ (or Tb 3+ ), SrLaGa3O7:Eu 3+ (or Tb 3+ ), SrLaO(BO3):Eu 3+ (or Tb 3+ ), SrO:Eu 3+ (or Tb 3+ ), SrY2O4:(Sr position):Eu 3+ (or Tb 3+ ), SrY2O4:(Y position 1):Eu 3+ (or Tb 3+ ), SrY2O4:(Y position 2):Eu 3+ (or Tb 3+ ), Tb2Mo3O 12 :EU 3+ (or Tb 3+ ), Tb2W3O 12 :EU 3+ (or Tb 3+ ), TbBO3:Eu 3+ (or Tb 3+ ), ThO2:Eu 3+ (or Tb 3+ ), X1-Gd2SiO5:Eu 3+ (or Tb 3+ ), X1-Y2SiO5:Eu 3+ (or Tb 3+ ), X2-Y2SiO5:Eu 3+ (or Tb 3+ ), Y 17.33 (BO3)4(B2O5)2O 16 :EU 3+ (or Tb 3+ ),Y2Ge2O7:Eu 3+ (or Tb 3+ ),Y2GeO5:Eu 3+ (or Tb 3+ ), Y2O2(SO4):Eu 3+ (or Tb3+ ), Y2O2S:Eu 3+ (or Tb 3+ ), Y2O2S:Eu 3+ (or Tb 3+ ), Y2O3:Eu 3+ (or Tb 3+ ), Y2P4O 13 :EU 3+ (or Tb 3+ ), Y2Si2O7:Eu 3+ (or Tb 3+ ), Y2SiO5:Eu 3+ (or Tb 3+ ), Y3Al5O 12 :EU 3+ (or Tb 3+ ), Y3O4Br:Eu 3+ (or Tb 3+ ), Y3O4Cl:Eu 3+ (or Tb 3+ ), Y3PO7:Eu 3+ (or Tb 3+ ),Y4GeO8:Eu 3+ (or Tb 3+ ), Y8P2O 17 :EU 3+ (or Tb 3+ ), YAl3(BO3)4:Eu 3+ (or Tb 3+ ), YAlO3:Eu 3+ (or Tb 3+ ), YBO3:Eu 3+ (or Tb 3+ ), YbOBr:Yb:Eu 3+ (or Tb 3+ ), YF3:Eu 3+ (or Tb 3+ ), YOBr:Eu 3+ (or Tb 3+ ), YOCl:Eu 3+ (or Tb 3+ ), YOCl:Eu 3+ (or Tb 3+ ), YOF:Eu 3+ (or Tb 3+ ), Y OF:Eu 3+ (or Tb 3+ ), YP3O9:Eu 3+ (or Tb3+ ) YPO4:Eu 3+ (or Tb 3+ ) YTaO4:Eu 3+ (or Tb 3+ ) YVO4:Eu 3+ (or Tb 3+ ) ZrP2O7:Eu 3+ (or Tb 3+ ) Y3Al5O 12 :Ce 3+ Lu3Al5O 12 :Ce 3+ It is selected from the group consisting of these or a mixture thereof.

[0074] Notation: Eu 3+ (:Tb 3+ :Ce 3+ :Mn 2+ or :Mn 4+ ) indicates that the host lattice is doped with Eu 3+ (Tb 3+ Ce 3+ Mn 2+ or Mn 4+ ), which those skilled in the art will understand.

[0075] The second luminescent material As considered, the first luminescent material may contain the nanoparticles of the present invention. In a composition in which the first luminescent material contains the nanoparticles of the present invention, the second luminescent material is preferably as described below. More preferably, the first luminescent material is the Y2O3:RE nanoparticles of the present invention in which RE is europium(III), terbium(III) or a combination thereof, and the second luminescent material is as described below. [[ID=5�]]

[0076] Suitable inorganic luminescent materials may be used as the second luminescent material. The second material can absorb light of the second wavelength. The second wavelength may be any wavelength of interest.

[0077] Preferably, the second light-emitting material has one or more excitation bands in the wavelength range of 380-580 nm, and more preferably, the second light-emitting material has one or more excitation bands in the UV-A (315-400 nm), violet (400-440 nm), blue (440-480 nm), or green (510-560 nm), most preferably in the blue (440-480 nm) range. LEDs based on (Al,In,Ga)N generate efficient "pump" light in the violet-to-blue wavelength range (approximately 400 nm to approximately 480 nm). An example of a blue excitation material is CaAlSiN3:Eu 2+ Y3Al5O 12 :Ce 3+ These are CsPbBr3, CdSe, and InP.

[0078] In another aspect of the present invention, the second light-emitting material has one or more excitation bands at 700-1400 nm (IR-A), 580-600 nm (amber and / or orange), 560-580 nm (yellow), 510-560 nm (green), 480-510 nm (cyan), 440-480 nm (blue), 400-440 nm (violet), 315-400 nm (UV-A), and / or 280-315 nm (UV-B).

[0079] In another preferred embodiment, the host lattice of the second luminescent material is garnet, fluoride, silicate, phosphate, or nitride, more preferably Y3Al5O 12 (YAG), Lu3Al5O 12 (LuAG), MgF2, CaF2, Sr2SiO4, Ba2SiO4, Ca2MgSi2O7, LiSrPO4, CaAlSiN3, or combinations thereof are selected from the group. Rather, the host lattice of the preferred second luminescent material is Eu 2+ Pb 2+ , Bi 3+ and Ce 3+ Doped with one or more ions selected from the group consisting of Tb 3+ EU combined with 2+ or Ce 3+ And most preferably Tb 3+ Ce combined with 3+ That is the case.

[0080] Preferably, the host lattice of the second light-emitting material or its precursor is Y3Al5O 12 (YAG), Lu3Al5O 12 Garnets such as (LuAG) or combinations thereof. Most preferably, the host lattice is Y3Al5O 12 (YAG), Lu3Al5O 12 (LuAG) or a combination thereof is selected, and the dopant is Tb as needed. 3+ Combined with Ce 3+ Includes.

[0081] Preferably, Ce 3+ In the case of doping by , the second luminescent material has a host lattice doped with 0.05 to 5%, more preferably 0.1 to 4%.

[0082] Preferably, the first material is the Y2O3:RE nanoparticle of the present invention in which RE is europium(III), and the second material is Ce 3+ or Tb 3+ Y3Al5O doped with 12 It is. More preferably, Y3Al5O 12 The material is provided as nanoparticles.

[0083] Preferably, the first material is the Y2O3:RE nanoparticle of the present invention, wherein RE is europium(III) and / or terbium(III), and the second material is a semiconductor nanoparticle material.

[0084] In a preferred embodiment, the first material is a Y2O3:RE nanoparticle of the present invention in which RE is europium(III), and the second material is a Y2O3:RE nanoparticle of the present invention in which RE is terbium(III).

[0085] The present invention further relates to a light-emitting device comprising a light-emitting material that can be obtained by the method of the present invention. Preferably, the light-emitting device further comprises an excitation source for the light-emitting material, such as a second light-emitting material. Preferably, the excitation source is a UV-A, purple, or blue light-emitting material that emits light toward the light-emitting material at 315-400 nm (UV-A), 400-440 nm (violet), or 440-480 nm (blue), more preferably 430-465 nm.

[0086] The present invention further relates to a lighting system comprising the light-emitting device of the present invention. Preferably, the lighting system is selected from the group consisting of lamps or luminaires, office lighting systems, home systems, store lighting systems, residential lighting systems, accent lighting systems, spot lighting systems, theater lighting systems, fiber optic systems, projection systems, self-illuminating display systems, pixel display systems, segment display systems, warning display systems, medical lighting systems, sign display systems, and decorative lighting systems, portable systems, automotive systems, and greenhouse lighting systems.

[0087] The present invention further relates to the use of the luminescent composition of the present invention or the luminescent material comprising the Y2O3:RE nanoparticles of the present invention as a marker. A tagant is a marker added to a material to enable various tests. The overall excitation / emission spectrum of the luminescent material and / or luminescent composition of the present invention may have unique characteristics compared to conventional methods, so that it may be useful as a tagant in anti-counterfeiting applications. For example, U.S. Patent No. 7,667,828 discloses a labeling system comprising various tagants that are different from each other.

[0088] The present invention is further defined in the following sections. [1] The Y2O3:RE nanoparticles of the present invention having a cubic crystal structure, wherein RE is a trivalent rare earth metal ion. [2] The nanoparticle according to [1], wherein RE is europium(III), terbium(III), or a combination thereof. [3] The nanoparticles are nanoplatelets, as described in [1] or [2]. [4] D of the minimum dimension of the nanoparticles 50 The nanoparticle is one of any one of [1] to [3], wherein the value is 0.5 nm or more and 100 nm or less, preferably 0.5 nm or more and 50 nm or less, and preferably 0.5 nm or more and 10 nm or less. [5] A nanoparticle according to any one of [1] to [4], wherein the dimension in one direction is 0.5 nm or more and 10 nm or less. [6] D of the minimum dimension of the nanoparticles 50 The nanoparticles are those with a value of 0.5 nm or more and 10 nm or less, as described in any one of [1] to [5]. [7] Nanoparticles according to any one of [1] to [6] that can emit light in red, green and / or yellow. Nanoparticles that can be obtained by any one of the methods described in [8] [9] to

[15] . [9] a) A step of preparing a mixture comprising (i) a yttrium salt and / or yttrium alkoxide, (ii) a rare earth metal salt and / or rare earth metal alkoxide, and (iii) an organic solvent. b) In some cases, the mixture is subjected to a pretreatment step which includes heating to at least 80°C or a temperature such that crystal water and / or organic impurities are removed. c) Heating the mixture to 220°C to 320°C and / or a temperature at which a precursor complex is formed; d) A step of subjecting the mixture to a precipitation step in which a precipitate is formed, wherein the step preferably includes cooling the mixture and / or adding a poor solvent to the mixture; and e) The precipitate is heated at 600°C to 900°C and / or at a temperature at which a Y2O3 cubic crystal structure is formed, preferably for at least 10 minutes. A method for producing Y2O3:RE nanoparticles, including the aforementioned.

[10] - The yttrium salt is selected from the group consisting of halides, acetates, acetylacetonates, sulfates and nitrates, or mixtures thereof, and / or hydrates thereof; - The aforementioned yttrium alkoxide is given by formula Y(OR)3 (wherein RO - (where R is an alkoxide and R is a C1-C4 group), preferably the alkoxide is an isopropoxide, ethoxide and / or tert-butoxide; - The rare earth metal salt is selected from the group consisting of halides, acetates, acetylacetonates, sulfates and nitrates, or mixtures thereof, and / or hydrates thereof; and / or - The aforementioned rare earth metal alkoxide is given by formula RE(OR)3 (wherein RO - The method according to [9], wherein (where R is an alkoxide and R is a C1-C4 group), preferably the alkoxide is an isopropoxide, ethoxide and / or tert-butoxide.

[11] The boiling point of the organic solvent is at a pressure of 10 5 The method according to [9] or

[10] , wherein the temperature is at least 280°C at Pa, and / or the organic solvent is selected from the group consisting of 1-octadecene, oleylamine, octadecylamine, oleic acid, or mixtures thereof.

[12] The method according to any one of [9] to

[11] , wherein in step b), the mixture is heated to about 100°C to about 180°C under atmospheric pressure or to 80°C to about 130°C under vacuum, and / or the mixture is heated for at least 10 minutes, preferably 10 to 420 minutes.

[13] The method according to any one of [9] to

[12] , wherein in step c), the mixture is heated for at least 15 minutes, preferably about 30 to about 120 minutes.

[14] The method according to any one of [9] to

[13] , wherein the poor solvent is a polar organic solvent, more preferably an alcohol or ketone, more preferably a C1-C4 alcohol or ketone, more preferably methanol, ethanol, propanol or acetone.

[15] The method according to any one of [9] to

[14] , wherein the precipitate is heated for 10 to 60 minutes.

[16] A light-emitting composition comprising nanoparticles described in any one of [1] to [8].

[17] The luminescent composition according to

[16] , comprising a first luminescent material capable of emitting light of a first wavelength and a second luminescent material capable of absorbing light of a second wavelength, having an emission spectrum that at least partially overlaps with one or more excitation bands of the first luminescent material, wherein at least one of the first luminescent material or the second luminescent material comprises nanoparticles according to any one of [1] to [8].

[18] The light-emitting composition according to

[17] , wherein the first light-emitting material and the second light-emitting material are arranged relative to each other so as to enable non-radiative energy transfer from the second light-emitting material to the first light-emitting material.

[19] The first material comprises Y2O3:RE nanoparticles described in any one of [1] to [8], and the second material comprises Y3Al5O 12 (YAG), Lu3Al5O 12 (LuAG) or a combination thereof, the dopant is Ce 3+ , Tb 3+ A light-emitting composition according to any one of

[16] to

[18] , or a combination thereof.

[20] The luminescent composition according to any one of

[16] to

[18] , wherein the first material comprises Y2O3:RE nanoparticles according to any one of [1] to [8], and the second material comprises a semiconductor nanoparticle material.

[21] The first material comprises a Y2O3:Eu nanoplatelet described in any one of [3] to [8], and the second material comprises a Y3Al5O 12 :Ce, Lu3Al5O 12 A light-emitting composition according to any one of

[16] to

[18] , comprising nanoparticles of Ce or a combination thereof.

[22] The first material comprises a Y2O3:Eu nanoplatelet described in any one of [3] to [8], and the second material comprises a Y3Al5O 12 :Ce,Tb,Lu3Al5O 12 A light-emitting composition according to any one of

[16] to

[18] , comprising nanoparticles of Ce, Tb, or a combination thereof.

[23] The first material comprises a Y2O3:Tb nanoplatelet described in any one of [3] to [8], and the second material comprises a Y3Al5O12 :Ce, Lu3Al5O 12 A light-emitting composition according to any one of

[16] to

[18] , comprising nanoparticles of Ce or a combination thereof.

[24] The first material comprises a Y2O3:Tb nanoplatelet described in any one of [3] to [8], and the second material comprises a Y3Al5O 12 :Ce,Tb,Lu3Al5O 12 A light-emitting composition according to any one of

[16] to

[18] , comprising nanoparticles of Ce, Tb, or a combination thereof.

[25] The first material comprises a Y2O3:Tb,Eu nanoplatelet described in any one of [3] to [8], and the second material comprises a Y3Al5O 12 :Ce, Lu3Al5O 12 A light-emitting composition according to any one of

[16] to

[18] , comprising nanoparticles of Ce or a combination thereof.

[26] The first material comprises a Y2O3:Tb,Eu nanoplatelet described in any one of [3] to [8], and the second material comprises a Y3Al5O 12 :Ce,Tb,Lu3Al5O 12 A light-emitting composition according to any one of

[16] to

[18] , comprising nanoparticles of Ce, Tb, or a combination thereof.

[27] A light-emitting composition according to any one of

[16] to

[26] , and a light-emitting device comprising a purple and / or blue light-emitting semiconductor material. A system comprising the light-emitting composition and / or the light-emitting device described in any one of

[16] to

[26] , wherein the system is a. Office lighting systems b. Home systems c. Store lighting system d. Residential lighting systems e. Accent lighting system c. Spot lighting system g. Theater lighting systems h. Systems for optical fibers i. Projection System j. Self-illuminating display systems k. Pixel Display System l. Segment display system m. Warning display system n. Medical lighting systems o. Signage and display system p. Decorative lighting systems q. Portable system r. Automotive systems s. Greenhouse lighting system t. Display device backlight u. Luminous display v. Micro LED A system that is one or more of the following.

[29] Use of any one of the luminescent compositions described in

[16] to

[26] as a tagant, for example, in applications such as anti-counterfeiting.

[0089] The present invention will be further illustrated by the following embodiments, but will not be limited thereto. [Examples]

[0090] Example 1 Y 2 O 3 :EU 3+ Synthesis of nanoplatelets 0.8 mmol of YCl3.6H2O and 0.14 mmol of EuCl3.6H2O (to achieve a doping rate of 15%) were mixed with 40 mL of oleylamine. First, the mixture was heated at 160°C for 30 minutes under ambient conditions (in air). Then, the mixture was heated at 280°C for 60 minutes in an N2 atmosphere. The mixture was cooled to room temperature, washed with 20 mL of ethanol, and dried.

[0091] The emission spectrum of this intermediate product is shown in Figure 1. The XRD pattern of this product is shown in Figure 2.

[0092] The intermediate product was placed in an 800°C oven for 30 minutes under ambient conditions.

[0093] The emission spectrum of the final product is shown in Figure 3. The XRD pattern of the final product is shown in Figure 4.

[0094] Example 2 Y 2 O 3 :Tb 3+ Synthesis of nanoplatelets 0.8 mmol of YCl3.6H2O and 0.14 mmol of TbCl3.6H2O (to achieve a doping rate of 15%) were mixed with 40 mL of oleylamine. First, the mixture was heated at 160°C for 30 minutes under ambient conditions. Then, the mixture was heated at 280°C for 60 minutes in an N2 atmosphere. The mixture was cooled to room temperature, washed with 20 mL of ethanol, and dried.

[0095] The thickness of the intermediate product platelet was determined to be less than 5 nm.

[0096] The product was placed in an 800°C oven for 30 minutes under ambient conditions.

[0097] The emission spectrum of this product is shown in Figure 5. The XRD of this product is shown in Figure 6.

[0098] Example 3: LaPO 4 :Tb 3+ +Y 2 O 3 :EU 3+ Proof of energy transfer in mixtures Y2O3:Eu obtained in Example 1 3+ The following experiment was conducted to demonstrate the energy transfer of particles.

[0099] Y2O3:Eu obtained in Example 1 3+ It was provided in powder form.

[0100] LaPO4:Tb with a doping rate of 50% 3+ The nanoparticles were supplied as a powder. LaPO4:Tb 3+ The nanoparticles are 5-10 nm in size and have an ethylene glycol ligand on their surface.

[0101] 100g of Y2O3:Eu 3+Powder and 100g of LaPO4:Tb 3+ The powder was mixed and dispersed in 15 ml of deionized water.

[0102] The dispersion was shaken and stirred for several minutes, followed by treatment in an ultrasonic bath for 1.5 hours.

[0103] The particles were dried in an oven at 120°C and then ground into a powder.

[0104] Next, the following measurements were performed on the mixture, and the pure Y2O3:Eu obtained in Example 1 was measured. 3+ It was compared with the measured value.

[0105] The mixture and the pure Y2O3:Eu obtained in Example 1 3+ We excited it at 486 nm, but here Tb 3+ Only is excitable. Figure 7 shows the emission intensity at 670-720 nm, but here Eu 3+ Only the solid line shows the emission intensity of the mixture, and the dotted line shows the emission intensity of pure Y2O3:Eu. 3+ This shows the luminescence intensity of the material.

[0106] The mixture showed a significant increase in luminescence in this region compared to the sample of Example 1, which is due to Tb 3+ from Eu 3+ This indicates energy transfer to [the target].

[0107] Eu at 700nm 3+ The excitation spectra of the emission were recorded and are shown in Figure 8. The solid line represents the excitation intensity of the mixture, and the dotted line represents pure Y2O3:Eu 3+ This shows the excitation intensity of the material. The mixture is Tb 3+ Excitation beam and Eu 3+ Both excitation lines are clearly visible, indicating an IFRET mechanism.

[0108] Figure 9 shows the pure Y2O3:Eu obtained in Example 1. 3+ This shows the decay of the material. Figure 10 shows LaPO4:Tb 3+ +Y2O3:Eu 3+ This shows the decay of the mixture. 3+The decay clearly demonstrates the rise time, which is a typical characteristic of non-radiative energy transfer processes in the case of mixtures.

[0109] Example 4 YAG:Tb 3+ +Y 2 O 3 :EU 3+ Proof of energy transfer in mixtures Y2O3:Eu obtained in Example 1 3+ The following experiment was conducted to demonstrate the energy transfer of particles.

[0110] Y2O3:Eu obtained in Example 1 3+ It was provided in powder form.

[0111] YAG:Tb 3+ The nanoparticles were supplied as a 20% by weight aqueous dispersion. YAG:Tb 3+ The nanoparticles were 5-10 nm in size and had an ethylene glycol ligand on their surface.

[0112] 100g of Y2O3:Eu 3+ Powder and 0.5 mL of YAG:Tb 3+ Dispersion (YAG:Tb 3+ 100g of the substance was dispersed in 15ml of deionized water.

[0113] The dispersion was shaken and stirred for several minutes, followed by treatment in an ultrasonic bath for 1.5 hours.

[0114] The particles were dried in an oven at 120°C.

[0115] The materials were crushed into a powder.

[0116] Next, the following measurements were performed on the mixture, and the pure Y2O3:Eu obtained in Example 1 was measured. 3+ It was compared with the measured value.

[0117] The sample was excited at 488 nm, but here Tb 3+Only is excitable. Figure 11 shows the emission intensity at 670-720 nm, but here Eu 3+ Only the solid line shows the emission intensity of the mixture, and the dotted line shows the emission intensity of pure Y2O3:Eu. 3+ This shows the luminescence intensity of the material. The sample obtained in Example 5 shows a significant increase in luminescence in this region, which is Tb 3+ from Eu 3+ This indicates energy transfer to [the target].

[0118] Eu at 700nm 3+ The excitation spectra of the emission were recorded and are shown in Figure 12. The solid line represents the excitation intensity of the mixture, and the dotted line represents pure Y2O3:Eu 3+ This shows the excitation intensity of the material. The mixture obtained in this example is Tb 3+ Excitation beam and Eu 3+ Both excitation lines are clearly visible, indicating an IFRET mechanism.

[0119] Example 5 YAG:Tb 3+ Ce 3+ +Y 2 O 3 :EU 3+ Proof of energy transfer in mixtures Y2O3:Eu obtained in Example 1 3+ The following experiment was conducted to demonstrate the energy transfer of particles.

[0120] Y2O3:Eu obtained in Example 1 3+ It was provided in powder form.

[0121] YAG:Tb 3+ Ce 3+ The nanoparticles were supplied as a 20% by weight aqueous dispersion. YAG:Tb 3+ Ce 3+ The nanoparticle size was 5-10 nm.

[0122] 100g of Y2O3:Eu 3+ Powder and 0.5 mL of YAG:Tb 3+ Ce 3+ Dispersion (YAG:Tb 3+100g of the substance was dispersed in 15ml of deionized water.

[0123] The dispersion was shaken and stirred for several minutes, followed by treatment in an ultrasonic bath for 1.5 hours.

[0124] The particles were dried in an oven at 120°C.

[0125] The materials were crushed into a powder.

[0126] Next, the following measurements were performed on the mixture, and the pure Y2O3:Eu obtained in Example 1 was measured. 3+ It was compared with the measured value.

[0127] The sample was excited at a wavelength of 440 nm, but here Ce 3+ Only can be directly excited. Figure 13 shows the emission intensity at 525-720 nm, but here, Ce 3+ , Tb 3+ and Eu 3+ The emission peak can be seen. Eu 3+ Since it cannot be directly excited at 440 nm, this result indicates that Ce 3+ (→Tb 3+ )→Eu 3+ This shows the energy transfer.

[0128] Example 6 TEM image Figure 14 shows a TEM image of the product from Example 1. A thin platelet that (partially) rolls up can be observed to have formed. The thickness of the platelet was determined to be less than 10 nm. The invention as described in the original claims of the patent application is listed below. [1] Y with a cubic crystal structure 2 O 3 :RE nanoparticles, wherein RE is a trivalent rare earth metal ion. [2] The nanoparticle according to [1], wherein RE is europium(III), terbium(III), or a combination thereof. [3] The nanoparticles according to [1] or [2], wherein the nanoparticles are nanoplatelets. [4] D of the minimum dimension of the nanoparticles 50 A nanoparticle according to any one of [1] to [3], wherein the value is 0.5 nm or more and 100 nm or less, preferably 0.5 nm or more and 50 nm or less, and preferably 0.5 nm or more and 10 nm or less. [5] D of the minimum dimension of the nanoparticles 50 A nanoparticle described in any one of [1] to [4], having a value between 0.5 nm and 10 nm. [6] A nanoparticle according to any one of [1] to [5], wherein the dimension in one direction is 0.5 nm or more and 10 nm or less. [7] Nanoparticles according to any one of [1] to [6] that can emit light in red, green and / or yellow. Nanoparticles that can be obtained by any one of the methods described in [8] [9] to

[15] . [9] a) A step of preparing a mixture comprising (i) a yttrium salt and / or yttrium alkoxide, (ii) a rare earth metal salt and / or rare earth metal alkoxide, and (iii) an organic solvent. b) In some cases, the mixture is subjected to a pretreatment step which includes heating to at least 80°C or a temperature at which crystal water and / or organic impurities are removed. c) Heating the mixture to 220°C to 320°C and / or a temperature at which the precursor complex is formed; d) A step of subjecting the mixture to a precipitation step in which a precipitate is formed, wherein the step preferably includes cooling the mixture and / or adding a poor solvent to the mixture; and e) The precipitate is heated at 600°C to 900°C and / or Y 2 O 3 A step of heating at a temperature at which a cubic crystal structure is formed, preferably for at least 10 minutes. Y 2 O 3 Method for producing :RE nanoparticles.

[10] - The yttrium salt is selected from the group consisting of halides, acetates, acetylacetonates, sulfates and nitrates, or mixtures thereof, and / or hydrates thereof; - The aforementioned yttrium alkoxide is given by formula Y(OR) 3 (In the formula, RO - (where R is an alkoxide and R is a C1-C4 group), preferably the alkoxide is an isopropoxide, ethoxide and / or tert-butoxide; - The rare earth metal salt is selected from the group consisting of halides, acetates, acetylacetonates, sulfates and nitrates, or mixtures thereof, and / or hydrates thereof; and / or - The aforementioned rare earth metal alkoxide is given by formula RE(OR) 3 (In the formula, RO - (where R is an alkoxide and R is a C1-C4 group), preferably the alkoxide is an isopropoxide, ethoxide and / or tert-butoxide; [9] the method thereof.

[11] The boiling point of the organic solvent is at a pressure of 10 5 The method according to [9] or

[10] , wherein the temperature is at least 280°C at Pa, and / or the organic solvent is selected from the group consisting of 1-octadecene, oleylamine, octadecylamine, oleic acid, or mixtures thereof.

[12] The method according to any one of [9] to

[11] , wherein in step b), the mixture is heated to about 100°C to about 180°C under atmospheric pressure or to 80°C to about 130°C under vacuum, and / or the mixture is heated for at least 10 minutes, preferably 10 to 420 minutes.

[13] The method according to any one of [9] to

[12] , wherein in step c), the mixture is heated for at least 15 minutes, preferably about 30 to about 120 minutes.

[14] The method according to any one of [9] to

[13] , wherein the poor solvent is a polar organic solvent, more preferably an alcohol or ketone, more preferably a C1-C4 alcohol or ketone, more preferably methanol, ethanol, propanol or acetone.

[15] The method according to any one of [9] to

[14] , wherein the precipitate is heated for 10 to 60 minutes.

[16] A light-emitting composition comprising nanoparticles described in any one of [1] to [8].

[17] The luminescent composition according to

[16] , comprising a first luminescent material capable of emitting light of a first wavelength and a second luminescent material capable of absorbing light of a second wavelength, having an emission spectrum that at least partially overlaps with one or more excitation bands of the first luminescent material, wherein at least one of the first luminescent material or the second luminescent material comprises nanoparticles according to any one of [1] to [8].

[18] The light-emitting composition according to

[17] , wherein the first light-emitting material and the second light-emitting material are arranged relative to each other so as to enable non-radiative energy transfer from the second light-emitting material to the first light-emitting material.

[19] The first material is Y as described in any one of [1] to [8]. 2 O 3 The second material contains :RE nanoparticles, and the second material is Y 3 Al 5 O 12 (YAG), Lu 3 Al 5 O 12 (LuAG) or a combination thereof, the dopant is Ce 3+ , Tb 3+ A light-emitting composition according to any one of

[16] to

[18] , or a combination thereof.

[20] The first material is Y as described in any one of [1] to [8] 2 O 3 A light-emitting composition according to any one of

[16] to

[18] , comprising :RE nanoparticles, wherein the second material comprises a semiconductor nanoparticle material.

[21] The first material is Y as described in any one of [3] to [8]. 2 O 3 :Eu nanoplatelets, the second material is Y 3 Al 5 O 12 :Ce, Lu 3 Al 5 O 12 A light-emitting composition according to any one of

[16] to

[18] , comprising nanoparticles of Ce or a combination thereof.

[22] The first material is Y as described in any one of [3] to [8]. 2 O 3 :Eu nanoplatelets, the second material is Y 3 Al 5 O 12 :Ce,Tb,Lu 3 Al 5 O 12 A light-emitting composition according to any one of

[16] to

[18] , comprising nanoparticles of Ce, Tb, or a combination thereof.

[23] The first material is Y as described in any one of [3] to [8]. 2 O 3 :Tb nanoplatelets are included, and the second material is Y 3 Al 5 O 12 :Ce, Lu 3 Al 5 O 12 A light-emitting composition according to any one of

[16] to

[18] , comprising nanoparticles of Ce or a combination thereof.

[24] The first material is Y as described in any one of [3] to [8]. 2 O 3 :Tb nanoplatelets are included, and the second material is Y 3 Al 5 O 12 :Ce,Tb,Lu 3 Al 5 O 12 A light-emitting composition according to any one of

[16] to

[18] , comprising nanoparticles of Ce, Tb, or a combination thereof.

[25] The first material is Y as described in any one of [3] to [8]. 2 O 3 :Tb,Eu nanoplatelets are included, and the second material is Y 3 Al 5 O 12 :Ce, Lu 3 Al 5 O 12 A light-emitting composition according to any one of

[16] to

[18] , comprising nanoparticles of Ce or a combination thereof.

[26] The first material is Y as described in any one of [3] to [8]. 2 O 3 :Tb,Eu nanoplatelets are included, and the second material is Y 3 Al 5 O 12 :Ce,Tb,Lu 3 Al 5 O 12 A light-emitting composition according to any one of

[16] to

[18] , comprising nanoparticles of Ce, Tb, or a combination thereof.

[27] A light-emitting composition according to any one of

[16] to

[26] , and a light-emitting device comprising a purple and / or blue light-emitting semiconductor material. A system comprising the light-emitting composition and / or the light-emitting device described in any one of

[16] to

[26] , wherein the system is a. Office lighting systems b. Home systems c. Store lighting system d. Residential lighting systems e. Accent lighting system c. Spot lighting system g. Theater lighting systems h. Systems for optical fibers i. Projection System j. Self-illuminating display systems k. Pixel Display System l. Segment display system m. Warning display system n. Medical lighting systems o. Signage and display system p. Decorative lighting systems q. Portable system r. Automotive systems s. Greenhouse lighting system t. Display device backlight u. Luminous display v. Micro LED A system that is one or more of the following.

[29] Use of any one of the luminescent compositions described in

[16] to

[26] as a tagant, for example, in applications such as anti-counterfeiting.

Claims

1. cubic crystal structure Y ２ O ３ A method for producing RE nanoplatelets, wherein the RE is a trivalent rare earth metal ion, and the minimum dimension of the nanoplatelet is D ５０ The value is 0.5 nm or more and 10 nm or less, and the dimensions in the other two directions are at least 5 times the minimum dimension of the nanoplatelet. a) A step of preparing a mixture comprising (i) a yttrium salt and / or yttrium alkoxide, (ii) a rare earth metal salt and / or rare earth metal alkoxide, and (iii) an organic solvent; b) A step of subjecting the mixture to a pretreatment step which may include heating to at least 80°C or a temperature at which crystal water and / or organic impurities are removed. c) Heating the mixture to 220°C to 320°C and / or a temperature at which the precursor complex is formed; d) a step of subjecting the mixture to a precipitation step in which a precipitate is formed, wherein the step preferably includes cooling the mixture and / or adding a poor solvent to the mixture; and e) a step of heating the precipitate at 600°C to 900°C, preferably for at least 10 minutes. Methods that include...

2. - The yttrium salt is selected from the group consisting of halides, acetates, acetylacetonates, sulfates, and nitrates, or mixtures thereof, and / or hydrates thereof; - The aforementioned yttrium alkoxide is given by formula Y(OR) ３ (In the formula, RO － (where R is an alkoxide and R is a C1-C4 group), preferably the alkoxide is an isopropoxide, ethoxide and / or tert-butoxide; - The rare earth metal salt is selected from the group consisting of halides, acetates, acetylacetonates, sulfates and nitrates, or mixtures thereof, and / or hydrates thereof; and / or - The aforementioned rare earth metal alkoxide is of the formula RE(OR) ３ (In the formula, RO － (where R is an alkoxide and R is a C1-C4 group), preferably the alkoxide is an isopropoxide, ethoxide and / or tert-butoxide; the method according to claim 1.

3. The boiling point of the aforementioned organic solvent is at a pressure of 10 ５ The method according to claim 1 or 2, wherein the temperature is at least 280°C at Pa, and / or the organic solvent is selected from the group consisting of 1-octadecene, oleylamine, octadecylamine, oleic acid, or a mixture thereof.

4. The method according to any one of claims 1 to 3, wherein in step b), the mixture is heated to about 100°C to about 180°C under atmospheric pressure, or to 80°C to about 130°C under vacuum, and / or the mixture is heated for at least 10 minutes, preferably 10 to 420 minutes.

5. The method according to any one of claims 1 to 4, wherein in step c), the mixture is heated for at least 15 minutes, preferably for about 30 to about 120 minutes.

6. The method according to any one of claims 1 to 5, wherein the poor solvent is a polar organic solvent, more preferably an alcohol or ketone, more preferably a C1-C4 alcohol or ketone, more preferably methanol, ethanol, propanol or acetone.

7. The method according to any one of claims 1 to 6, wherein the precipitate is heated for 10 to 60 minutes.

8. A cubic Y₂O₃:RE nanoplatelet, wherein RE is a trivalent rare earth metal ion, the D50 value of the minimum dimension of the nanoplatelet is 0.5 nm or more and 10 nm or less, and the dimension in at least one direction other than the minimum dimension of the nanoplatelet is at least 10 times the minimum dimension.

9. A light-emitting composition comprising the nanoplatelet described in claim 8.

10. The light-emitting composition according to claim 9, comprising a first light-emitting material capable of emitting light of a first wavelength and a second light-emitting material capable of absorbing light of a second wavelength, having an emission spectrum that at least partially overlaps with one or more excitation bands of the first light-emitting material, wherein at least one of the first light-emitting material or the second light-emitting material comprises the nanoplatelet described in claim 8.

11. The light-emitting composition according to claim 10, wherein the first light-emitting material and the second light-emitting material are arranged relative to each other so as to enable non-radiative energy transfer from the second light-emitting material to the first light-emitting material.

12. The first material is Y as described in claim 8 ２ O ３ : including RE nanoplatelets, the second material is Y ３ Al ５ O １２ (YAG), Lu ３ Al ５ O １２ (LuAG) or a combination thereof, and the dopant is Ce ３＋ , Tb ３＋ or a combination thereof, the luminescent composition according to any one of claims 9 to 11.

13. The first material is Y as described in claim 8. ２ O ３ The light-emitting composition according to any one of claims 9 to 11, comprising RE nanoplatelets, wherein the second material comprises a semiconductor nanoparticle material.

14. The first material is Y as described in claim 8. ２ O ３ : The second material comprises Eu nanoplatelets, and Y ３ Al ５ O １２ : Ce, Lu ３ Al ５ O １２ A light-emitting composition according to any one of claims 9 to 11, comprising nanoparticles of Ce or a combination thereof.

15. The first material is Y as described in claim 8. ２ O ３ : The second material comprises Eu nanoplatelets, and Y ３ Al ５ O １２ : Ce, Tb, Lu ３ Al ５ O １２ A light-emitting composition according to any one of claims 9 to 11, comprising nanoparticles of Ce, Tb, or a combination thereof.

16. The first material is Y as described in claim 8. ２ O ３ : comprising Tb nanoplatelets, the second material is Y ３ Al ５ O １２ : Ce, Lu ３ Al ５ O １２ A light-emitting composition according to any one of claims 9 to 11, comprising nanoparticles of Ce or a combination thereof.

17. The first material is Y as described in claim 8. ２ O ３ : comprising Tb nanoplatelets, the second material is Y ３ Al ５ O １２ : Ce, Tb, Lu ３ Al ５ O １２ A light-emitting composition according to any one of claims 9 to 11, comprising nanoparticles of Ce, Tb, or a combination thereof.

18. The first material is Y as described in claim 8. ２ O ３ : Includes Tb,Eu nanoplatelets, and the second material is Y ３ Al ５ O １２ : Ce, Lu ３ Al ５ O １２ A light-emitting composition according to any one of claims 9 to 11, comprising nanoparticles of Ce or a combination thereof.

19. The first material is Y as described in claim 8. ２ O ３ : Includes Tb,Eu nanoplatelets, and the second material is Y ３ Al ５ O １２ : Ce, Tb, Lu ３ Al ５ O １２ A light-emitting composition according to any one of claims 9 to 11, comprising nanoparticles of Ce, Tb, or a combination thereof.

20. A light-emitting composition according to any one of claims 9 to 19, and a light-emitting device comprising a purple and / or blue light-emitting semiconductor material.

21. A system comprising a light-emitting composition according to any one of claims 9 to 19 and / or a light-emitting device according to claim 20, wherein the system is a. Office lighting systems b. Home systems c. Store lighting system d. Residential lighting systems e. Accent lighting system c. Spot lighting system g. Theater lighting system h. Optical fiber systems i. Projection System j. Self-illuminating display system k. Pixel display system l. Segment display system m. Warning display system n. Medical lighting systems o. Signage and display system p. Decorative lighting systems Q. Portable system r. Automotive systems s. Greenhouse lighting system t. Display device backlight u. Light-emitting display v. Micro LED A system that is one or more of the following.

22. Use of the luminescent composition according to any one of claims 9 to 19 as a tagant.

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