CN115785956A - Cr (chromium) 3+ Doped hexafluoroscandate near-infrared fluorescent powder and preparation method and application thereof - Google Patents
Cr (chromium) 3+ Doped hexafluoroscandate near-infrared fluorescent powder and preparation method and application thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims description 22
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims description 12
- 229910052804 chromium Inorganic materials 0.000 title claims description 12
- 239000000463 material Substances 0.000 claims abstract description 25
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- 239000000126 substance Substances 0.000 claims abstract description 5
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 28
- HYXGAEYDKFCVMU-UHFFFAOYSA-N scandium oxide Chemical compound O=[Sc]O[Sc]=O HYXGAEYDKFCVMU-UHFFFAOYSA-N 0.000 claims description 26
- 238000003756 stirring Methods 0.000 claims description 19
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- 238000001035 drying Methods 0.000 claims description 13
- WPFGFHJALYCVMO-UHFFFAOYSA-L rubidium carbonate Chemical compound [Rb+].[Rb+].[O-]C([O-])=O WPFGFHJALYCVMO-UHFFFAOYSA-L 0.000 claims description 13
- 229910000026 rubidium carbonate Inorganic materials 0.000 claims description 13
- 238000005406 washing Methods 0.000 claims description 13
- -1 ammonium hexafluorochromate Chemical compound 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 9
- 238000003760 magnetic stirring Methods 0.000 claims description 9
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 6
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- 239000013078 crystal Substances 0.000 claims description 4
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- 238000006467 substitution reaction Methods 0.000 abstract 1
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- 238000000034 method Methods 0.000 description 5
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- JQMFQLVAJGZSQS-UHFFFAOYSA-N 2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-N-(2-oxo-3H-1,3-benzoxazol-6-yl)acetamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)CC(=O)NC1=CC2=C(NC(O2)=O)C=C1 JQMFQLVAJGZSQS-UHFFFAOYSA-N 0.000 description 2
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 2
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 2
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- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
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- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- 229910001419 rubidium ion Inorganic materials 0.000 description 1
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- 230000003595 spectral effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
The invention belongs to the technical field of luminescent materials, and discloses Cr 3+ The doped near-infrared fluoscandate fluorescent powder has the chemical composition of Rb 2 NaSc 1‑x F 6 :xCr 3+ Wherein x is doped Cr 3+ Relative to Sc in the matrix 3+ Coefficient of mole percent, and 0<x is less than or equal to 0.07. The invention takes the positive trivalent transition metal chromium ion as the luminescence center, and realizes the chemical formula composition of Rb through the substitution of the positive trivalent chromium ion on the positive trivalent scandium ion lattice site in the matrix 2 NaSc 1‑x F 6 :xCr 3+ A light emitting material of (1), absorption in an ultraviolet region, a blue region and emission in a near infrared region, and Cr 3+ Does not change the lattice structure of the host material.
Description
Technical Field
The invention belongs to the technical field of luminescent materials, and particularly relates to Cr 3+ Doped hexafluoroscandate near-infrared fluorescent powder and a preparation method and application thereof.
Background
The broadband near-infrared light source (600-1000 nm) has important application prospects in night vision, nondestructive detection, intelligent identification, food quality analysis, biomedical diagnosis and other aspects. At present, the conventional Near Infrared (NIR) radiation source mainly includes the conventional incandescent lamp and halogen lamp, but has limited practical application due to irreparable defects of long response time, heavy volume, low efficiency, and the like. Compared with the traditional NIR radiation source, the NIRpc-LED combining the NIR broadband fluorescent powder with the commercial blue LED chip has the outstanding advantages of adjustable wavelength, high efficiency, durability, compactness and the like, and is widely concerned by people.
Wherein the transition metal Cr 3+ The active ion for broadband near-infrared emission is the most ideal active ion for broadband near-infrared emission reported at present, and is expected to realize broadband NIR emission because the active ion has wider absorption bands in blue, orange and red spectral regions, the blue light absorption band is well matched with a commercial blue light chip, and the emission wavelength of the active ion has strong adjustable denaturation.
It is noted that temperature is an important parameter that affects the luminescent properties of a material. At higher temperatures, the luminescence intensity of the luminescent material generally decreases due to an increase in the non-radiative transition; in the operating state, the LED device usually accumulates much heat, resulting in an operating temperature close to or even exceeding 150 ℃, and thus the fluorescent thermal stability of the luminescent material determines the application value thereof to a great extent.
Therefore, the technical personnel in the field need to solve the problem that the near-infrared fluorescent powder which is matched with a blue light LED chip, high in luminous efficiency and good in thermal stability can be provided.
Disclosure of Invention
In view of this, the present invention provides a Cr 3+ The invention discloses doped near-infrared fluoscandate fluorescent powder and a preparation method and application thereof 2 NaSc 1-x F 6 :xCr 3+ The light emitting material of (1), absorption in an ultraviolet region, a blue region and emission in a near infrared region,and Cr 3+ Does not change the lattice structure of the host material.
In order to achieve the purpose, the invention adopts the following technical scheme:
cr (chromium) 3+ The doped hexafluoroscandate near-infrared fluorescent powder comprises doped ions and a matrix material; wherein the doped ions are Cr 3+ Ion, the matrix material is Rb 2 NaScF 6 ；
The dopant ions are doped in the host material to arbitrarily replace the Sc sites in the crystal.
The fluoride host material is an excellent luminescent main body and has the characteristics of stable crystal structure, high melting point, wide energy band gap, various structural morphological characteristics and the like; cr 3+ The ion has a unique 3d 3 The electronic configuration of the outer layer is an ideal NIR luminescence center, and can be generated by selecting a proper host material and adjusting the crystal field intensity 4 T 2 → 4 A 2 Broadband near-infrared emission of transitions; therefore, the invention uses the positive trivalent transition metal Cr 3+ As a luminescent center, the hexafluoroscandate Rb is used 2 NaScF 6 As a substrate, a non-toxic, chemically stable and highly heat stable (I) is prepared 150℃ = 92%) of a luminescent material having a chemical composition Rb 2 NaSc 1-x F 6 :xCr 3+ (ii) a Wherein the anion of the matrix material is fluorinion, the lattice structure is cubic double perovskite type, and the crystal structure is formed by [ NaF 6 ]And [ ScF ] 6 ]The dioctahedral are arranged alternately, and the rubidium ions are in four [ NaF ] 6 ]And [ ScF ] 6 ]The center of the octahedron forms a three-dimensional network structure.
Preferably, the chemical formula of the near-infrared luminescent material is Rb 2 NaSc 1-x F 6 :xCr 3+ ；
Wherein x is Cr 3+ Ion relative to Sc 3+ Coefficient of mole percent of ions, and 0<x≤0.07。
Preferably, the near-infrared luminescent material can generate broadband near-infrared emission with the wavelength in the range of 600-1000nm under the excitation of blue light.
The above Cr 3+ The preparation method of the doped hexafluoroscandate near-infrared fluorescent powder comprises the following specific steps:
adding scandium oxide, rubidium carbonate, sodium fluoride and ammonium hexafluorochromate into hydrofluoric acid solution in sequence, reacting to obtain precipitate, washing and drying the precipitate to obtain the Cr 3+ Doped hexafluoroscandate near-infrared fluorescent powder.
Preferably, the rubidium carbonate is added after the scandium oxide is stirred for 40-60 min; wherein the stirring reaction is magnetic stirring.
Preferably, the rubidium carbonate will emit a large amount of heat after addition, and the sodium fluoride is added after the solution is cooled to room temperature.
Preferably, the concentration of the hydrofluoric acid solution is 40-49wt%.
Preferably, the reaction is carried out for 8-10h at normal temperature by stirring.
Preferably, the washing adopts absolute ethyl alcohol, and the washing times are 4; the drying temperature is 60-80 ℃, and the drying time is 4-8h.
The near-infrared luminescent material prepared by the method or the near-infrared luminescent material prepared by the method is applied to a blue light LED chip.
Compared with the prior art, the invention has the following beneficial effects:
1) The near-infrared fluorescent powder generates a broadband near-infrared emission peak under the excitation of 438nm blue light, the emission peak is positioned in the wavelength range of 600-900nm, the half-peak width is 111nm, and the strongest emission peak is positioned at 775 nm;
2) The near-infrared fluorescent powder has excellent luminescence property and high thermal quenching temperature (I) 150℃ = 92%), has thermal stability far higher than that reported in most prior arts, meets the practical requirement of being used with high-power pc-LED devices, and has important guiding significance for basic research and practical application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 shows the preparation of near-infrared phosphors Rb of examples 1-5 2 NaSc 1-x F 6 :xCr 3+ (x =0.005, 0.01, 0.03, 0.05, 0.07) XRD diffractogram;
FIG. 2 shows the near-infrared phosphor Rb prepared in example 2 2 NaSc 0.99 F 6 :0.01Cr 3+ Scanning Electron Microscope (SEM) images of (a);
FIG. 3 shows the near-infrared phosphor Rb prepared in example 5 2 NaSc 0.93 F 6 :0.07Cr 3+ Excitation and emission spectra at room temperature;
FIG. 4 shows the near-infrared phosphor Rb prepared in example 3 2 NaSc 0.97 F 6 :0.03Cr 3+ A variable temperature spectrogram at a temperature of between 25 and 200 ℃;
FIG. 5 shows the near-infrared phosphor Rb prepared in example 1 2 NaSc 0.995 F 6 :0.005Cr 3+ Matrix Rb (b) 2 NaScF 6 Can be used in the energy band diagram.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Cr (chromium) 3+ The preparation method of the doped hexafluoroscandate near-infrared fluorescent powder specifically comprises the following steps:
(1) Firstly, weighing 35 parts by weight of scandium oxide, adding the scandium oxide into a 50mL plastic test tube containing 5mL of HF solution (40 wt%), and stirring at constant speed for 40-60min under magnetic stirring until the scandium oxide is completely dissolved to form a uniform solution;
(2) Sequentially adding 110 parts of rubidium carbonate, 20 parts of sodium fluoride and 0.5 part of ammonium hexafluorochromate into the solution obtained in the step (1), stirring at a constant speed, reacting for 8 hours at room temperature, centrifugally washing for 4 times by using absolute ethyl alcohol, and drying for 4 hours in an oven at 80 ℃ to obtain a product Rb 2 NaSc 0.995 F 6 :0.005Cr 3+ 。
Example 2
Cr (chromium) 3+ The preparation method of the doped hexafluoroscandate near-infrared fluorescent powder specifically comprises the following steps:
(1) Firstly, weighing 35 parts by weight of scandium oxide, adding the scandium oxide into a 50mL plastic test tube containing 5mL of HF solution (40 wt%), and stirring at a constant speed for 40-60min under magnetic stirring until the scandium oxide is completely dissolved to form a uniform solution;
(2) Adding 115 parts of rubidium carbonate, 20 parts of sodium fluoride and 1 part of ammonium hexafluorochromate into the solution obtained in the step (1) in sequence, stirring at a constant speed, reacting for 8 hours at room temperature, centrifugally washing for 4 times by using absolute ethyl alcohol, and drying for 4 hours in an oven at 80 ℃ to obtain a product Rb 2 NaSc 0.99 F 6 :0.01Cr 3+ 。
Example 3
Cr (chromium) 3+ The preparation method of the doped hexafluoroscandate near-infrared fluorescent powder specifically comprises the following steps:
(1) Firstly, weighing 35 parts by weight of scandium oxide, adding the scandium oxide into a 50mL plastic test tube containing 5mL of HF solution (40 wt%), and stirring at constant speed for 40-60min under magnetic stirring until the scandium oxide is completely dissolved to form a uniform solution;
(2) Sequentially adding 110 parts of rubidium carbonate, 25 parts of sodium fluoride and 3 parts of ammonium hexafluorochromate into the solution obtained in the step (1), stirring at a constant speed, reacting for 8 hours at room temperature, centrifugally washing for 4 times by using absolute ethyl alcohol, and drying for 4 hours in an oven at 80 ℃ to obtain a product Rb 2 NaSc 0.97 F 6 :0.03Cr 3+ 。
Example 4
Cr (chromium) 3+ The preparation method of the doped hexafluoroscandate near-infrared fluorescent powder specifically comprises the following steps:
(1) Firstly, weighing 35 parts by weight of scandium oxide, adding the scandium oxide into a 50mL plastic test tube containing 5mL of HF solution (40 wt%), and stirring at constant speed for 40-60min under magnetic stirring until the scandium oxide is completely dissolved to form a uniform solution;
(2) Sequentially adding 120 parts of rubidium carbonate, 25 parts of sodium fluoride and 5 parts of ammonium hexafluorochromate into the solution obtained in the step (1), stirring at a constant speed, reacting for 8 hours at room temperature, centrifugally washing for 4 times by using absolute ethyl alcohol, and drying for 4 hours in an oven at 80 ℃ to obtain a product Rb 2 NaSc 0.95 F 6 :0.05Cr 3+ 。
Example 5
Cr (chromium) 3+ The preparation method of the doped hexafluoroscandate near-infrared fluorescent powder specifically comprises the following steps:
(1) Firstly, weighing 35 parts by weight of scandium oxide, adding the scandium oxide into a 50mL plastic test tube containing 5mL of HF solution (40 wt%), and stirring at constant speed for 40-60min under magnetic stirring until the scandium oxide is completely dissolved to form a uniform solution;
(2) Adding 115 parts of rubidium carbonate, 25 parts of sodium fluoride and 7 parts of ammonium hexafluorochromate into the solution obtained in the step (1) in sequence, stirring at a constant speed, reacting for 8 hours at room temperature, centrifugally washing for 4 times by using absolute ethyl alcohol, and drying for 4 hours in an oven at 80 ℃ to obtain a product Rb 2 NaSc 0.93 F 6 :0.07Cr 3+ 。
FIG. 1 shows the preparation of near-infrared phosphors Rb of examples 1-5 2 NaSc 1-x F 6 :xCr 3+ The XRD diffraction pattern of (1) shows that the diffraction peak is related to the matrix Rb 2 NaScF 6 The diffraction peaks of the standard card (JCPDS No. 24-0970) are completely corresponding, indicating that the synthesized sample is pure phase, and no impurity phase and additional diffraction peak appear, cr 3+ Does not alter the lattice structure of the substrate;
FIG. 2 shows the near-infrared phosphor Rb prepared in example 2 2 NaSc 0.99 F 6 :0.01Cr 3+ As can be seen from fig. 2, the sample has good crystallinity, smooth surface, irregular oblate shape and square particles with different sizes attached;
FIG. 3 shows the near-infrared phosphor Rb prepared in example 5 2 NaSc 0.93 F 6 :0.07Cr 3+ As can be seen from fig. 3, two distinct broadband excitation peaks were observed in the wavelength range of 400-700nm in the excitation spectrum and emission spectrum at room temperature; under the excitation of blue light of 438nm, a broadband emission peak can be observed in the wavelength range of 600-900nm, the half-peak width of the broadband emission peak is 111nm, and the strongest emission is positioned at 775 nm;
FIG. 4 shows the near-infrared phosphor Rb prepared in example 3 2 NaSc 0.97 F 6 :0.03Cr 3+ In the temperature change spectrogram within the range of 25-200 ℃, as can be seen from fig. 4, when the working temperature is 150 ℃, the final luminous intensity still maintains 92% of the room temperature value, which indicates that the luminescent material has good thermal quenching resistance;
FIG. 5 shows a diagram of a near-infrared phosphor Rb prepared by the same method as in example 1 2 NaSc 0.995 F 6 :0.005Cr 3+ Matrix Rb (b) 2 NaScF 6 The calculation results show that the direct band gap of the material is 6.838eV, the wide band gap can provide enough space to accommodate the impurity level, and can also be Cr 3+ Provide a suitable environment for stabilizing Cr 3+ Energy level of (2), indicating Cr 3+ Can be successfully doped into a light emitting host.
Comparative example 1
Cr (chromium) 3+ The preparation method of the doped hexafluoroscandate near-infrared fluorescent powder specifically comprises the following steps:
(1) Firstly, weighing 30 parts by weight of scandium oxide, adding the scandium oxide into a 50mL plastic test tube containing 5mL of HF solution (40 wt%), and stirring at constant speed for 40-60min under magnetic stirring until the scandium oxide is completely dissolved to form a uniform solution;
(2) Adding 105 parts of rubidium fluoride, 20 parts of sodium fluoride and 3 parts of ammonium hexafluorochromate into the solution obtained in the step (1) in sequence, stirring at a constant speed, reacting for 8 hours at room temperature, centrifugally washing for 4 times by using absolute ethyl alcohol, and drying for 4 hours in an oven at 80 ℃ to obtain a product Rb 2 NaSc 0.97 F 6 :0.03Cr 3+ 。
Compared with the rubidium source rubidium fluoride used in comparative example 1, the method has the advantages thatThe used raw material rubidium carbonate is cheaper, so that the cost is effectively reduced; for the preparation processes of the prior technical schemes such as oil bath, hydrothermal and high-temperature solid phase method, the ion exchange method is simple and convenient to operate, and the reaction process of high temperature and high pressure is avoided. In addition, the luminescent property and the fluorescence thermal stability of the material are obviously improved and enhanced, particularly Rb 2 NaScF 6 :Cr 3+ The luminous intensity at 150 ℃ is 92% of the room temperature value.
Comparative example 2
Cr (chromium) 3+ The preparation method of the doped hexafluoroscandate near-infrared fluorescent powder specifically comprises the following steps:
(1) Firstly, weighing 35 parts by weight of scandium oxide, adding the scandium oxide into a 50mL plastic test tube containing 5mL of LHF solution (40 wt%), and stirring at a constant speed for 40-60min under magnetic stirring until the scandium oxide is completely dissolved to form a uniform solution;
(2) Sequentially adding 110 parts of rubidium fluoride, 20 parts of sodium fluoride and 3 parts of ammonium hexafluorochromate into the solution obtained in the step (1), stirring at a constant speed, reacting at room temperature for 12 hours, centrifugally washing for 4 times by using absolute ethyl alcohol, and drying in an oven at 80 ℃ for 4 hours to obtain a product Rb 2 NaSc 0.97 F 6 :0.03Cr 3+ 。
As can be seen from comparative example 2, when the reaction time is prolonged to 12h, the stirring time is too long, which results in slight concentration quenching, more central ions are replaced by the luminescence central chromium ions, and the room-temperature luminescence intensity of the prepared phosphor is reduced by 7% compared with that of example 1.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. Cr (chromium) 3+ The doped hexafluoroscandate near-infrared fluorescent powder is characterized by comprising doped ions and a matrix material; wherein the doped ions are Cr 3+ Ion, the matrix material is Rb 2 NaScF 6 ；
The dopant ions are doped in the host material to arbitrarily replace the Sc sites in the crystal.
2. Cr according to claim 1 3+ The doped hexafluoroscandate near-infrared fluorescent powder is characterized in that the chemical general formula of the near-infrared luminescent material is Rb 2 NaSc 1-x F 6 :xCr 3+ ；
Wherein x is Cr 3+ Ion relative to Sc 3+ A molar percentage coefficient of ion of 0<x≤0.07。
3. Cr according to claim 1 3+ The doped hexafluoroscandate near-infrared fluorescent powder is characterized in that broadband near-infrared emission with the wavelength within the range of 600-1000nm can be generated under the excitation of blue light of the near-infrared luminescent material.
4. Cr (chromium) 3+ The preparation method of the doped hexafluoroscandate near-infrared fluorescent powder is characterized by comprising the following specific steps of:
(1) Weighing raw materials: 30-35 parts of scandium oxide, 100-120 parts of rubidium carbonate, 20-25 parts of sodium fluoride and 1-7 parts of ammonium hexafluorochromate in parts by weight for later use;
(2) Adding scandium oxide, rubidium carbonate, sodium fluoride and ammonium hexafluorochromate into hydrofluoric acid solution in sequence, reacting for 8-10h to obtain precipitate, and washing and drying the precipitate to obtain Cr 3+ Doped hexafluoroscandate near-infrared fluorescent powder.
5. According to claim 4The Cr 3+ The preparation method of the doped hexafluoroscandate near-infrared fluorescent powder is characterized in that the rubidium carbonate is added after scandium oxide is stirred for 40-60 min; wherein the stirring reaction is magnetic stirring.
6. The Cr of claim 4 3+ The preparation method of the doped hexafluoroscandate near-infrared fluorescent powder is characterized in that a large amount of heat is released after the rubidium carbonate is added, and the sodium fluoride is added after the solution is cooled to room temperature.
7. Cr according to claim 4 3+ The preparation method of the doped hexafluoroscandate near-infrared fluorescent powder is characterized in that the concentration of the hydrofluoric acid solution is 40-49wt%.
8. Cr according to claim 4 3+ The preparation method of the doped hexafluoroscandate near-infrared fluorescent powder is characterized in that the reaction is a stirring reaction at normal temperature for 8-10h.
9. Cr according to claim 4 3+ The preparation method of the doped hexafluoroscandate near-infrared fluorescent powder is characterized in that absolute ethyl alcohol is adopted for washing, and the washing times are 4; the drying temperature is 60-80 ℃, and the drying time is 4-8h.
10. The near-infrared luminescent material according to any one of claims 1 to 3 or the near-infrared luminescent material prepared by the preparation method according to any one of claims 4 to 9 is applied to a blue light LED chip.
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| CN116425547A (en) * | 2023-03-16 | 2023-07-14 | 广东省科学院资源利用与稀土开发研究所 | Chromium ion activated scandium-based fluoride broadband near infrared luminescent ceramic material and preparation method thereof |
| CN116606653A (en) * | 2023-05-26 | 2023-08-18 | 昆明理工大学 | Preparation method of trivalent chromium ion doped broadband near infrared fluorescent material |
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| WO2017161852A1 (en) * | 2016-03-24 | 2017-09-28 | 中山大学 | Red fluoride phosphor powder and preparation method therefor and use thereof |
| CN114196404A (en) * | 2021-09-30 | 2022-03-18 | 云南民族大学 | Double perovskite type near-infrared luminescent material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2017161852A1 (en) * | 2016-03-24 | 2017-09-28 | 中山大学 | Red fluoride phosphor powder and preparation method therefor and use thereof |
| CN114196404A (en) * | 2021-09-30 | 2022-03-18 | 云南民族大学 | Double perovskite type near-infrared luminescent material and preparation method thereof |
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| CN116425547A (en) * | 2023-03-16 | 2023-07-14 | 广东省科学院资源利用与稀土开发研究所 | Chromium ion activated scandium-based fluoride broadband near infrared luminescent ceramic material and preparation method thereof |
| CN116425547B (en) * | 2023-03-16 | 2024-01-30 | 广东省科学院资源利用与稀土开发研究所 | Chromium ion activated scandium-based fluoride broadband near infrared luminescent ceramic material and preparation method thereof |
| CN116606653A (en) * | 2023-05-26 | 2023-08-18 | 昆明理工大学 | Preparation method of trivalent chromium ion doped broadband near infrared fluorescent material |
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