CN114702955A - Bivalent europium activated cyan fluorescent powder and preparation method and application thereof - Google Patents

Bivalent europium activated cyan fluorescent powder and preparation method and application thereof Download PDF

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CN114702955A
CN114702955A CN202210361074.2A CN202210361074A CN114702955A CN 114702955 A CN114702955 A CN 114702955A CN 202210361074 A CN202210361074 A CN 202210361074A CN 114702955 A CN114702955 A CN 114702955A
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fluorescent powder
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divalent europium
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CN114702955B (en
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杜甫
罗伟
周裕强
陈冲
张文
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Xuyu Optoelectronics Shenzhen Co ltd
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    • C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
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    • C09K11/7783—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
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Abstract

The application relates to the technical field of luminescent materials, in particular to bivalent europium-activated cyan fluorescent powder and a preparation method and application thereof. The preparation method of the divalent europium activated cyan fluorescent powder comprises the following steps: weighing compound raw materials of each element according to a stoichiometric ratio of a chemical formula, and grinding and mixing to obtain a raw material mixture; and providing a carbon-containing reducing atmosphere, sintering the raw material mixture, and performing post-treatment to obtain the divalent europium-activated cyan fluorescent powder. The reducing atmosphere containing carbon has a weaker reducing power than the strong reducing gas, so that the europium-containing compound is reduced to a lesser extent, and the sintering of the raw material mixture is carried out with an increase in temperatureEuropium enters the crystal lattice in trivalent form and then Eu is reduced under weaker reducing condition3+Reduction to Eu2+The obtained divalent europium-activated cyan fluorescent powder has broadband emission and excellent thermal stability.

Description

Bivalent europium activated cyan fluorescent powder and preparation method and application thereof
Technical Field
The application belongs to the technical field of luminescent materials, and particularly relates to divalent europium-activated cyan fluorescent powder and a preparation method and application thereof.
Background
As a fourth generation illumination light source, a white light diode (w-LED) is regarded as a promising new generation illumination technology due to its advantages of high efficiency, energy saving, environmental protection, and ultra-long lifetime. The LED illumination light source generally adopts a realization mode of combining a high-brightness blue light chip with single yellow fluorescent powder, and the mode obtains cold white light and has low color rendering index, and the problems of 'blue light damage' and the like are caused. In recent years, devices for "full spectrum health lighting" have gradually become hot in the industry, however, fluorescent powder with various wave bands is required for manufacturing the devices for "full spectrum health lighting", and commercial cyan fluorescent powder (470-500nm) is in the shortage at present, so that the development of high-performance cyan fluorescent powder will help to realize substantial progress of LED health lighting.
In recent years, spinel-structured fluorescent powder is more and more emphasized by researchers at home and abroad mainly because the luminescent material has excellent luminescent performance and stability, and the essential reason is that the crystal structure of the material is a cubic crystal system structure with high symmetry and compact atom stacking, so that the material has extremely excellent rigidity, and the spinel component commonly used as a matrix material at present is MgAl2O4、ZnAl2O4、ZnGa2O4And solid solutions of these host materials, the luminescence center ion having mainly Eu3+、Er3+、Yb3+、Cr3+、Ce3+、Mn4+And Mn2+And the like. However, at present, Eu is not available2+Activated spinel is reported, and most studies are mostly limited to Eu3+Doping mainly due to Eu3+Relative Eu2+Has smaller ionic radius and is easier to prepareEu3+Activated phosphor, however, Eu3+The activated rare earth luminescent material has low luminous efficiency, small spectrum coverage range (narrow half-peak width), poor thermal stability, low quantum efficiency and narrow long-wave emission band in the use process, and is not beneficial to wide application.
Disclosure of Invention
The application aims to provide bivalent europium-activated cyan fluorescent powder and a preparation method and application thereof, and aims to solve the problems that the fluorescent powder containing bivalent europium is difficult to prepare and the high-concentration doping of the bivalent europium is realized in the existing preparation method.
In order to achieve the purpose of the application, the technical scheme adopted by the application is as follows:
in a first aspect, the present application provides a method for preparing a divalent europium-activated cyan phosphor, comprising the steps of:
according to the formula Mg1-x-yRyAl2-zDzO4-mQm:xEu2+Obtaining compound raw materials of each element according to the metering ratio, and mixing to obtain a raw material mixture, wherein R is at least one of Li, Na and Zn, D is at least one of Ga, In, Y and Sc, Q is at least one of N, F, x is more than 0 and less than or equal to 0.2, Y is more than or equal to 0 and less than or equal to 0.2, z is more than or equal to 0 and less than or equal to 0.5, and m is more than or equal to 0 and less than or equal to 0.3;
and providing a carbon-containing reducing atmosphere, sintering the raw material mixture, and performing post-treatment to obtain the divalent europium-activated cyan fluorescent powder.
In a second aspect, the present application provides a divalent europium-activated cyan phosphor, wherein the cyan phosphor has a chemical formula of Mg1-x-yRyAl2-zDzO4-mQm:xEu2+R is at least one of Li, Na and Zn, D is at least one of Ga, In, Y and Sc, Q is at least one of N, F, x is more than 0 and less than or equal to 0.2, Y is more than or equal to 0 and less than or equal to 0.2, z is more than or equal to 0 and less than or equal to 0.5, and m is more than or equal to 0 and less than or equal to 0.3; wherein the cyan phosphor has a cubic spinel crystal structure, Eu2+Is a luminescent center.
In a third aspect, the present application provides a light-emitting device comprising a light source and a luminescent material, wherein the luminescent material is a divalent europium-activated cyan phosphor or a divalent europium-activated cyan phosphor prepared by the preparation method of the divalent europium-activated cyan phosphor.
In the preparation method, compound raw materials of each element are obtained according to the stoichiometric ratio of a chemical formula to obtain a raw material mixture, and then a carbon-containing reducing atmosphere is provided, wherein the reducing atmosphere generally adopted in the prior art is strong reducing gas such as hydrogen and the like, and the reducing ability of the carbon-containing reducing atmosphere is weaker than that of the strong reducing gas, so that the reduction degree of the europium-containing compound is smaller, and in the process of sintering the raw material mixture, europium enters crystal lattices in a trivalent form firstly along with the increase of temperature, and then Eu is reduced under the weaker reducing condition3+Is reduced to Eu2+The divalent europium-activated cyan fluorescent powder is obtained, so that the obtained divalent europium-activated cyan fluorescent powder shows excellent thermal stability, more choices are provided for the cyan fluorescent powder for a full-spectrum white light LED, the preparation method is simple in process, and the divalent europium-activated cyan fluorescent powder can be prepared only by adjusting different treatment conditions.
In a second aspect of the present application, a divalent europium-activated cyan phosphor is provided, wherein the cyan phosphor has a chemical general formula of Mg1-x-yRyAl2-zDzO4-mQm:xEu2+The provided cyan fluorescent powder has a cubic spinel crystal structure, the provided octahedral basic unit crystal is beneficial to Eu ions doped into crystal lattices and exciting materials to emit the cyan fluorescent powder, the obtained fluorescent powder material shows excellent thermal stability, presents high luminous intensity, wide half-peak width and large spectral coverage range, and provides more choices for the types of the existing cyan fluorescent powder materials.
In the light emitting device provided by the third aspect of the present application, since the luminescent material includes the above-mentioned cyan phosphor material, the emission spectrum of the obtained light emitting device is closer to the solar spectrum, the spectral continuity is strong, the color rendering index is high, and the light emitting device is a healthy illumination light source.
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In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a graph of excitation and emission spectra of the luminescent material obtained in example 1 provided in the examples of the present application.
FIG. 2 is an X-ray diffraction pattern of a luminescent material obtained in example 1/7/11/14/17/23 of the present application.
FIG. 3 is a graph showing excitation and emission spectra of a luminescent material obtained in example 7/11/14/17/23 of the present application.
Detailed Description
In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly apparent, the present application is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In this application, the term "and/or" describes an association relationship of associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a is present alone, A and B are present simultaneously, and B is present alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
In the present application, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, "at least one (a), b, or c", or "at least one (a), b, and c", may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, and c may be single or plural, respectively.
It should be understood that, in various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, some or all of the steps may be executed in parallel or executed sequentially, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The weight of the related components mentioned in the description of the embodiments of the present application may not only refer to the specific content of each component, but also represent the proportional relationship of the weight among the components, and therefore, the content of the related components is scaled up or down within the scope disclosed in the description of the embodiments of the present application as long as it is scaled up or down according to the description of the embodiments of the present application. Specifically, the mass in the description of the embodiments of the present application may be a mass unit known in the chemical field such as μ g, mg, g, kg, etc.
The terms "first" and "second" are used for descriptive purposes only and are used for distinguishing purposes such as substances from one another, and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. For example, a first XX may also be referred to as a second XX, and similarly, a second XX may also be referred to as a first XX, without departing from the scope of embodiments of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
The first aspect of the embodiments of the present application provides a method for preparing a divalent europium-activated cyan phosphor, which comprises the following steps:
s01, according to the chemical formula Mg1-x-yRyAl2-zDzO4-mQm:xEu2+Obtaining compound raw materials of each element according to the metering ratio, and mixing to obtain a raw material mixture, wherein R is at least one of Li, Na and Zn, D is at least one of Ga, In, Y and Sc, Q is at least one of N, F, and x is more than 0 and less than or equal to 0.2, 0≤y≤0.2，0≤z≤0.5，0≤m≤0.3；
And S02, providing a carbon-containing reducing atmosphere, sintering the raw material mixture, and performing post-treatment to obtain the divalent europium-activated cyan fluorescent powder.
In the method for preparing a cyan phosphor activated by divalent europium provided in the first aspect of the embodiments of the present application, compound raw materials of each element are obtained according to a stoichiometric ratio of a chemical formula to obtain a raw material mixture, and then a carbon-containing reducing atmosphere is provided, the reducing atmosphere generally used in the prior art is a strong reducing gas such as hydrogen, and the reducing ability of the carbon-containing reducing atmosphere is weaker than that of the strong reducing gas, so that the reduction degree of the europium-containing compound is small, and in the process of sintering the raw material mixture, as the temperature rises, europium enters into crystal lattices in a trivalent form first, and then Eu is reduced under a weaker reducing condition3+Is reduced to Eu2+The divalent europium-activated cyan fluorescent powder is obtained, so that the obtained divalent europium-activated cyan fluorescent powder shows excellent thermal stability, more choices are provided for developing the cyan fluorescent powder for full-spectrum use, the preparation method is simple in process, and the divalent europium-activated cyan fluorescent powder can be prepared only by adjusting different treatment conditions.
In step S01, according to the chemical formula Mg1-x-yRyAl2-zDzO4-mQm:xEu2+The raw materials of the compounds of each element are obtained according to the metering ratio, and are mixed to obtain a raw material mixture, wherein R is at least one of Li, Na and Zn, D is at least one of Ga, In, Y and Sc, Q is at least one of N, F, x is more than 0 and less than or equal to 0.2, Y is more than or equal to 0 and less than or equal to 0.2, z is more than or equal to 0 and less than or equal to 0.5, and m is more than or equal to 0 and less than or equal to 0.3.
In some embodiments, the resulting phosphor has the formula Mg1-x-yRyAl2-zDzO4-mQm:xEu2+(ii) a Wherein, the substitution of R is Mg element, and R is at least one of Li, Na and Zn. Doping the material with R element at the position of Mg ion can change the lattice volume of the material, and because the provided R element has difference with the Mg ion radius, introducing corresponding R element into the materialThe lattice volume formed by the elements of (1) is extruded to different degrees and is Eu2+Provides a wide space, thereby enabling more Eu2+Dissolving into crystal lattice, and finally improving the luminous intensity.
In some embodiments, in the formulae, R is selected to be 0 ≦ y ≦ 0.2; when the addition amount of the selected R element is 0, the R element doping is not included.
In some embodiments, the resulting phosphor has the formula Mg1-x-yRyAl2-zDzO4-mQm:xEu2+(ii) a Wherein D is at least one of Ga, In, Y and Sc. In the lattice position of Al ion, doping D element can change the lattice volume of the material, because the difference of ion radius between the provided D element and Al, when replacing partial Al, the lattice volume expands, and Eu is2+Occupies a larger polyhedral volume, is Eu2+Provides a wide lattice space, thereby enabling more Eu2+Dissolving into crystal lattice, and finally improving the luminous intensity.
In some embodiments, in the formulae, D is selected to be 0. ltoreq. z.ltoreq.0.5; when the addition amount of the selected D element is 0, the D element doping is not included.
In some embodiments, the resulting phosphor has the formula Mg1-x-yRyAl2-zDzO4-mQm:xEu2+(ii) a Wherein the substitution of Q is an element of O, and Q is at least one of N, F. In the position of O ion, doping O element, able to change the lattice volume of the material at the position, because the radius of the provided O element is different from that of Q element, the lattice volume is extruded or expanded to different extent after the corresponding element is introduced, resulting in the increase or decrease of the volume of each polyhedron, which is Eu2+Provides wider space and improves the luminous intensity.
In some embodiments, in the formulae, Q is selected to be 0. ltoreq. m.ltoreq.0.3; when the addition amount of the selected Q element is 0, the Q element doping is not included.
In some embodiments, the resulting fluorescenceThe chemical formula of the powder is Mg1-x-yRyAl2-zDzO4-mQm:xEu2+(ii) a Wherein, in the obtained fluorescent powder, the content of divalent europium is more than 0 and less than or equal to 0.2; in some embodiments, the divalent europium content is selected from 0.001. ltoreq. x.ltoreq.0.05.
In some embodiments, Mg according to formula1-x-yRyAl2-zDzO4-mQm:xEu2+The compound raw material of each element is obtained, wherein the compound raw material of each element comprises at least one of oxide, phosphate, carbonate, nitrate, fluoride and nitride.
In some embodiments, the compound feedstock for Mg includes, but is not limited to, magnesium oxide, magnesium phosphate, magnesium carbonate, magnesium nitrate, magnesium fluoride, magnesium nitride. The compound raw material of Al includes but is not limited to alumina, aluminum phosphate, aluminum carbonate, aluminum nitrate, aluminum fluoride, aluminum nitride. The compound raw material of R includes, but is not limited to, lithium oxide, lithium phosphate, lithium carbonate, lithium nitrate, lithium fluoride, lithium nitride, sodium oxide, sodium phosphate, sodium carbonate, sodium nitrate, sodium fluoride, sodium nitride, zinc oxide, zinc phosphate, zinc carbonate, zinc nitrate, zinc fluoride, zinc nitride. Compound starting materials for D include, but are not limited to, gallium oxide, gallium phosphate, gallium carbonate, gallium nitrate, gallium fluoride, gallium nitride, indium oxide, indium phosphate, indium carbonate, indium nitrate, indium fluoride, indium nitride, yttrium oxide, yttrium phosphate, yttrium carbonate, yttrium nitrate, yttrium fluoride, yttrium nitride, scandium oxide, scandium phosphate, scandium carbonate, scandium nitrate, scandium fluoride, scandium nitride. Compound feeds for Q include, but are not limited to, gallium oxide, gallium phosphate, gallium carbonate, gallium nitrate, gallium fluoride, gallium nitride. The compound raw material of Eu includes, but is not limited to, europium oxide.
In some embodiments, the mixing process further comprises: and grinding for 30-60 minutes after mixing. The compound raw materials are mixed and then ground, and the grinding treatment is mainly performed to enable the granularity of each raw material to be finer and more beneficial to uniformly mixing all the components.
In step S02, a reducing atmosphere containing carbon is provided, and the raw material mixture is sintered and then post-processed to obtain the divalent europium-activated cyan phosphor.
In some embodiments, the carbon-containing reducing atmosphere comprises at least one of a carbon reducing atmosphere, a mixed reducing atmosphere of carbon and at least one of air, an inert gas, and the like. In the prior art, the reducing atmosphere generally adopted is strong reducing gas such as hydrogen, and the reducing atmosphere containing carbon has weaker reducing capability than the strong reducing gas, so that the reduction degree of the europium-containing compound is smaller, and in the process of sintering the raw material mixture, europium firstly enters crystal lattices in a trivalent form along with the rise of temperature, and then Eu is subjected to weaker reducing condition3+Is reduced to Eu2+The divalent europium-activated cyan fluorescent powder is obtained, so that the obtained divalent europium-activated cyan fluorescent powder shows excellent luminous performance and thermal stability, more choices are provided for the cyan fluorescent powder for the full-spectrum white light LED, the preparation method is simple in process, and the divalent europium-activated cyan fluorescent powder can be prepared only by adjusting different treatment conditions.
In some embodiments, the carbon-containing reducing atmosphere comprises at least one of single-walled carbon nanotubes, multi-walled carbon nanotubes, carbon nanofibers, nanocarbon spheres, multi-layered graphene, graphene nanoplatelets, graphene oxide, activated carbon, mesoporous carbon, microporous carbon, mesoporous carbon, ketjen black, acetylene black, conductive carbon black, and coke. Providing a reducing atmosphere containing carbon which has weak reducibility and can be used for Eu3+The reduction degree is small, and Eu enters into crystal lattice in a trivalent form during the temperature rising process and then is reduced under weaker reduction condition3+Reduced to Eu2+。
In some embodiments, the carbon-containing reducing atmosphere is selected from carbon reducing atmospheres, and the provided carbon reducing atmosphere can be selected from at least one of the provided carbon materials.
In some embodiments, the carbon-containing reducing atmosphere is selected from mixed reducing atmospheres of carbon and at least one of air, an inert gas. Wherein the inert gas is selected from helium, neon, argon, krypton, xenon, radon and nitrogen.
In some embodiments, the carbon-containing reducing atmosphere is selected from at least one of a mixed reducing atmosphere of carbon and helium, a mixed reducing atmosphere of carbon and neon, a mixed reducing atmosphere of carbon and argon, a mixed reducing atmosphere of carbon and krypton, a mixed reducing atmosphere of carbon and xenon, a mixed reducing atmosphere of carbon and radon, and a mixed reducing atmosphere of carbon and nitrogen.
In some embodiments, the carbon-containing reducing atmosphere is selected from a mixed reducing atmosphere of carbon and air.
Further, the raw material mixture is subjected to sintering treatment. In some embodiments, the sintering temperature is 1300-1600 ℃ and the sintering time is 5-8 hours. The sintering treatment under the condition can ensure that the combination raw materials of each element fully react and form an ordered crystal structure with octahedron as a basic unit. In the reaction process, if the sintering temperature is too low or the sintering time is too short, it is not favorable for the raw materials to fully react, and if the sintering temperature is too high or the sintering time is too long, the stability of the crystal structure of the obtained material is affected.
In some embodiments, the temperature of the sintering process includes, but is not limited to, 1300 ℃, 1350 ℃, 1400 ℃, 1450 ℃, 1500 ℃, 1550 ℃, 1600 ℃.
In some embodiments, the time of the sintering process includes, but is not limited to, 5 hours, 5.5 hours, 6 hours, 6.5 hours, 7 hours, 7.5 hours, 8 hours.
In some embodiments, post-processing comprises: crushing, grinding and sieving. The sintered product is subjected to crushing treatment, grinding treatment and sieving treatment, so that the obtained fluorescent powder particles are moderate and uniform in size, and the performance of the fluorescent powder particles can be improved.
In a second aspect of the embodiments of the present application, there is provided a cyan phosphor activated by divalent europium, wherein the cyan phosphor has a chemical formula of Mg1-x-yRyAl2-zDzO4-mQm:xEu2+R is at least one of Li, Na and Zn, D is at least one of Ga, In, Y and Sc, Q is at least one of N, F, x is more than 0 and less than or equal to 0.2, Y is more than or equal to 0 and less than or equal to 0.2, z is more than or equal to 0 and less than or equal to 0.5, and m is more than or equal to 0 and less than or equal to 0.3(ii) a Wherein the cyan phosphor has a cubic spinel crystal structure, Eu2+Is a luminescent center.
In a second aspect of the embodiments of the present application, a cyan phosphor activated by divalent europium has a chemical formula of Mg1-x-yRyAl2-zDzO4-mQm:xEu2+The provided cyan fluorescent powder has a cubic spinel crystal structure, the provided octahedral basic unit crystal is beneficial to doping Eu ions into crystal lattices, and the obtained fluorescent powder material shows excellent thermal stability, presents high luminous intensity, wide half-peak width and large spectral coverage range, and provides more choices for the types of the existing cyan fluorescent powder materials.
In some embodiments, a divalent europium-activated cyan phosphor is provided having the general chemical formula Mg1-x-yRyAl2- zDzO4-mQm:xEu2+R is at least one of Li, Na and Zn, D is at least one of Ga, In, Y and Sc, and Q is at least one of N, F, wherein x is more than or equal to 0.001 and less than or equal to 0.05, Y is more than or equal to 0.05 and less than or equal to 0.1, z is more than or equal to 0.1 and less than or equal to 0.25, and m is more than or equal to 0.1 and less than or equal to 0.2.
In some embodiments, the peak wavelength of the emission spectrum of the cyan phosphor is between 460nm and 510nm, and the obtained phosphor material has excellent thermal stability, high luminous intensity, wide half-peak width and large spectral coverage, thereby providing more choices for the types of the existing cyan phosphor materials.
In a third aspect of the embodiments of the present application, there is provided a light emitting device comprising a light source and a luminescent material, wherein the luminescent material is a divalent europium-activated cyan phosphor or a divalent europium-activated cyan phosphor prepared by the method for preparing a divalent europium-activated cyan phosphor.
In the light emitting device provided by the third aspect of the embodiments of the present application, since the luminescent material includes the above-mentioned cyan phosphor material, the emission spectrum of the obtained light emitting device is closer to the solar spectrum, the spectral continuity is strong, the color rendering index is high, and the light emitting device is a healthy illumination light source.
The following description will be given with reference to specific examples.
Example 1
Preparation method of divalent europium activated cyan fluorescent powder
The preparation method comprises the following steps:
according to the formula Mg0.999Al2O4:0.001Eu2+Obtaining compound raw materials of each element according to the metering ratio, wherein each compound raw material is selected from MgO and Al2O3、Eu2O3Mixing the raw materials, grinding for 30 minutes, transferring and putting into an alumina crucible to obtain a raw material mixture,
providing carbon-containing graphite carbon in reducing atmosphere, sintering the raw material mixture at 1450 ℃ for 6h for sintering treatment, and then performing crushing treatment, grinding treatment and sieving treatment to obtain the divalent europium-activated cyan fluorescent powder.
Example 2
Preparation method of divalent europium activated cyan fluorescent powder
The preparation method comprises the following steps:
according to the formula Mg0.997Al2O4:0.003Eu2+Obtaining compound raw materials of each element according to the metering ratio, wherein each compound raw material is selected from MgO and Al2O3、Eu2O3Mixing the raw materials, grinding for 30 minutes, transferring and putting into an alumina crucible to obtain a raw material mixture,
providing carbon-containing graphite carbon in reducing atmosphere, sintering the raw material mixture at 1450 ℃ for 6h for sintering treatment, and then performing crushing treatment, grinding treatment and sieving treatment to obtain the divalent europium-activated cyan fluorescent powder.
Example 3
Preparation method of divalent europium activated cyan fluorescent powder
The preparation method comprises the following steps:
according to the formula Mg0.995Al2O4:0.005Eu2+Obtaining compound raw materials of each element according to the metering ratio, wherein each compound raw material is selected from MgO and Al2O3、Eu2O3Mixing the raw materials, grinding for 30 minutes, transferring and putting into an alumina crucible to obtain a raw material mixture,
providing carbon-containing graphite carbon in reducing atmosphere, sintering the raw material mixture at 1450 ℃ for 6h for sintering treatment, and then performing crushing treatment, grinding treatment and sieving treatment to obtain the divalent europium-activated cyan fluorescent powder.
Example 4
Preparation method of divalent europium activated cyan fluorescent powder
The preparation method comprises the following steps:
according to the formula Mg0.993Al2O4:0.007Eu2+Obtaining compound raw materials of each element according to the metering ratio, wherein each compound raw material is selected from MgO and Al2O3、Eu2O3Mixing the raw materials, grinding for 30 minutes, transferring and putting into an alumina crucible to obtain a raw material mixture,
providing carbon-containing graphite carbon in reducing atmosphere, sintering the raw material mixture at 1450 ℃ for 6h for sintering treatment, and then performing crushing treatment, grinding treatment and sieving treatment to obtain the divalent europium-activated cyan fluorescent powder.
Example 5
Preparation method of divalent europium activated cyan fluorescent powder
The preparation method comprises the following steps:
according to the formula Mg0.991Al2O4:0.009Eu2+Obtaining compound raw materials of each element according to the metering ratio, wherein each compound raw material is selected from MgO and Al2O3、Eu2O3Mixing the raw materials, grinding for 30 minutes, transferring and putting into an alumina crucible to obtain a raw material mixture,
providing carbon-containing graphite carbon in a reducing atmosphere, sintering the raw material mixture at 1450 ℃ for 6h for sintering treatment, and then performing crushing treatment, grinding treatment and sieving treatment to obtain the divalent europium-activated cyan fluorescent powder.
Example 6
Preparation method of divalent europium activated cyan fluorescent powder
The preparation method comprises the following steps:
according to the formula Mg0.989Al2O4:0.011Eu2+Obtaining compound raw materials of each element according to the metering ratio, wherein each compound raw material is selected from MgO and Al2O3、Eu2O3Mixing the raw materials, grinding for 30 minutes, transferring and putting into an alumina crucible to obtain a raw material mixture,
providing carbon-containing graphite carbon in reducing atmosphere, sintering the raw material mixture at 1450 ℃ for 6h for sintering treatment, and then performing crushing treatment, grinding treatment and sieving treatment to obtain the divalent europium-activated cyan fluorescent powder.
Examples 7 to 24
Preparation method of divalent europium activated cyan fluorescent powder
The preparation method comprises the following steps:
according to the formula Mg1-x-yRyAl2-zDzO4-mQm:xEu2+R is at least one of Li, Na and Zn, D is at least one of Ga, In, Y and Sc, Q is at least one of N, F, x is more than 0 and less than or equal to 0.2, Y is more than or equal to 0 and less than or equal to 0.2, z is more than or equal to 0 and less than or equal to 0.5, and m is more than or equal to 0 and less than or equal to 0.3, wherein each compound raw material is selected from raw materials, mixed and treated, ground for 30 minutes and then transferred into an alumina crucible to obtain a raw material mixture, wherein the chemical formula of the divalent europium-activated cyan fluorescent powder of examples 7-24 and the selected compound raw materials are shown In Table 1,
providing carbon-containing graphite carbon in a reducing atmosphere, sintering the raw material mixture at 1450 ℃ for 6h for sintering treatment, and then performing crushing treatment, grinding treatment and sieving treatment to obtain the divalent europium-activated cyan fluorescent powder.
TABLE 1
Figure BDA0003585300200000121
Figure BDA0003585300200000131
Comparative example 1
Fluorescent material
The compound composition formula of which is Mg1-xAl2O4:xEu3+(x is 0.007), and MgO and Al are accurately weighed according to the stoichiometric ratio respectively2O3、Eu2O3Placing the raw materials in a grinder, grinding for 30 min, transferring and placing into an alumina crucible, sintering at 1450 deg.C for 6H under reducing atmosphere of 5% H2+95％N2And cooling to room temperature along with the furnace, and carrying out post-treatment such as grinding, sieving and the like on the obtained roasted product to obtain the red-light fluorescent material with uniform granularity.
Comparative example 2
Fluorescent material
A fluorescent material comprising a compound having the composition formula of Mg1-xAl2O4:xEu3+(x is 0.007), and MgO and Al are accurately weighed according to the stoichiometric ratio respectively2O3、Eu2O3The raw materials are placed in a grinder, the raw materials are transferred and put into an alumina crucible after being ground for 30 minutes, the raw materials are sintered for 6 hours at the high temperature of 1450 ℃, the raw materials are cooled to the room temperature along with the furnace in the air atmosphere, and the obtained roasted product is ground, sieved and the like to obtain the fluorescent material with uniform granularity.
Performance testing
The fluorescent materials obtained in examples 1 to 24 and comparative examples 1 to 2 were subjected to performance tests, respectively, including peak wavelength (nm), internal quantum efficiency, relative luminous intensity at 473K, and the like.
Analysis of results
The performance tests of the fluorescent materials obtained in examples 1 to 24 and comparative examples 1 to 2 are respectively carried out, and the results of the tests on properties including peak wavelength (nm), internal quantum efficiency, relative luminous intensity at 473K and the like are shown in table 2, and it can be seen from table 2 that the emission peak wavelength of the obtained cyan fluorescent material is 460nm to 510nm, which shows high luminous intensity, wide half-peak width and large spectral coverage range, and provides more choices for the types of the existing cyan fluorescent powder materials.
TABLE 2
Figure BDA0003585300200000141
Figure BDA0003585300200000151
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A preparation method of divalent europium activated cyan fluorescent powder is characterized by comprising the following steps:
according to the formula Mg1-x-yRyAl2-zDzO4-mQm:xEu2+Obtaining compound raw materials of each element according to the metering ratio, and mixing to obtain a raw material mixture, wherein R is at least one of Li, Na and Zn, D is at least one of Ga, In, Y and Sc, Q is at least one of N, F, x is more than 0 and less than or equal to 0.2, Y is more than or equal to 0 and less than or equal to 0.2, z is more than or equal to 0 and less than or equal to 0.5, and m is more than or equal to 0 and less than or equal to 0.3;
and providing a carbon-containing reducing atmosphere, sintering the raw material mixture, and performing post-treatment to obtain the divalent europium-activated cyan fluorescent powder.
2. The method of claim 1, wherein the carbon-containing reducing atmosphere comprises at least one of a carbon reducing atmosphere, a mixed reducing atmosphere of carbon and at least one of air and an inert gas.
3. The method of claim 1, wherein the carbon in the reducing atmosphere comprises at least one of single-walled carbon nanotubes, multi-walled carbon nanotubes, carbon nanofibers, carbon nanospheres, multi-layered graphene, graphene nanoplatelets, graphene oxide, activated carbon, mesoporous carbon, microporous carbon, mesoporous carbon, ketjen black, acetylene black, conductive carbon black, and coke.
4. The method of any one of claims 1 to 3, wherein the sintering temperature is 1300 to 1600 ℃ and the sintering time is 5 to 8 hours.
5. The method of any one of claims 1 to 3, wherein the post-treatment comprises: crushing, grinding and sieving.
6. The method of any one of claims 1 to 3, wherein the mixing process further comprises: and grinding for 30-60 minutes after mixing.
7. The method of any one of claims 1 to 3, wherein the compound material of each element comprises at least one of an oxide, a phosphate, a carbonate, a nitrate, a fluoride, and a nitride.
8. A divalent europium activated cyan fluorescent powder is characterized in that the chemical general formula of the cyan fluorescent powder is Mg1-x- yRyAl2-zDzO4-mQm:xEu2+R is at least one of Li, Na and Zn, D is at least one of Ga, In, Y and Sc, Q is at least one of N, F, x is more than 0 and less than or equal to 0.2, Y is more than or equal to 0 and less than or equal to 0.2, z is more than or equal to 0 and less than or equal to 0.5, and m is more than or equal to 0 and less than or equal to 0.3; wherein the cyan fluorescent powder has a cubic spinel crystal structure, Eu2+To emit lightA center.
9. The divalent europium-activated cyan phosphor of claim 8, wherein the emission spectrum peak wavelength of the cyan phosphor is 460nm to 510 nm.
10. A light-emitting device comprising a light source and a luminescent material, wherein the luminescent material is a divalent europium-activated cyan phosphor prepared by the method for preparing a divalent europium-activated cyan phosphor according to any one of claims 1 to 7, or a divalent europium-activated cyan phosphor according to any one of claims 8 to 9.
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