CN112410029A - Plant growth lamp used deep red fluorescent powder and preparation method thereof - Google Patents
Plant growth lamp used deep red fluorescent powder and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 230000008635 plant growth Effects 0.000 title claims description 21
- MCSXGCZMEPXKIW-UHFFFAOYSA-N 3-hydroxy-4-[(4-methyl-2-nitrophenyl)diazenyl]-N-(3-nitrophenyl)naphthalene-2-carboxamide Chemical compound Cc1ccc(N=Nc2c(O)c(cc3ccccc23)C(=O)Nc2cccc(c2)[N+]([O-])=O)c(c1)[N+]([O-])=O MCSXGCZMEPXKIW-UHFFFAOYSA-N 0.000 title claims description 16
- 239000000463 material Substances 0.000 claims abstract description 15
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- 229910001416 lithium ion Inorganic materials 0.000 claims description 7
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- 229910001632 barium fluoride Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
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- 230000005284 excitation Effects 0.000 abstract description 6
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- 239000000049 pigment Substances 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 4
- 239000013589 supplement Substances 0.000 abstract description 4
- 238000005286 illumination Methods 0.000 abstract description 3
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 12
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 11
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 10
- 229910010350 Li2MTiO4 Inorganic materials 0.000 description 7
- 230000004907 flux Effects 0.000 description 6
- 239000000395 magnesium oxide Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 239000011787 zinc oxide Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 238000004020 luminiscence type Methods 0.000 description 5
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- 238000004601 linear muffin-tin orbital method Methods 0.000 description 4
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- 229910017682 MgTi Inorganic materials 0.000 description 3
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- 230000017260 vegetative to reproductive phase transition of meristem Effects 0.000 description 2
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- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
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- 238000010276 construction Methods 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
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- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 230000029553 photosynthesis Effects 0.000 description 1
- 238000010672 photosynthesis Methods 0.000 description 1
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- 238000000634 powder X-ray diffraction Methods 0.000 description 1
- -1 rare earth ion Chemical class 0.000 description 1
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- 230000001105 regulatory effect Effects 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001868 water Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/67—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing refractory metals
- C09K11/671—Chalcogenides
- C09K11/673—Chalcogenides with alkaline earth metals
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/20—Forcing-frames; Lights, i.e. glass panels covering the forcing-frames
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
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- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a dark red fluorescent powder for plant illumination under blue light excitation and a preparation method thereof, wherein the fluorescent material has a chemical formula as follows: li2MTi(1‑x‑y)O4:xMn4+,yGa3+Wherein, 0<x≤1%，0<yLess than or equal to 0.5, M = Mg, Zn. The fluorescent material has stronger absorption to near ultraviolet and blue light wave bands, the emission wave band covers 600-800nm, and the peak value is 675 nm. The invention also provides a preparation method of the material, which is characterized in that the raw materials are mixed according to a certain proportion, and a proper amount of fluxing agent is added to reduce the sintering temperature and the cost. Transition metal Mn with lower price than rare earth element4+The activator is prepared by a high-temperature solid phase method, and the method has simple process, low production cost and easy large-scale production. Meanwhile, the emission waveband of the fluorescent powder is matched with the absorption waveband of the plant pigment, and the fluorescent powder is dark red fluorescent powder suitable for plant light supplement.
Description
Technical Field
The invention relates to the field of luminescent materials, in particular to a formula and a preparation method of efficient and high-thermal-stability deep red LED fluorescent powder for a plant growth lamp.
Background
The facility agriculture has the advantages of controllable planting risk, large-scale cultivation and the like, and plays an increasingly important role in improving the yield, quality and the like of agricultural products. The light is an energy source for plant growth, and facility agriculture needs a large amount of artificial light sources to supplement light for plants. However, the light emitting area of the light emitting devices widely used in white light illumination such as high-pressure sodium lamps, fluorescent lamps and incandescent lamps cannot be completely matched with the absorption area of plant growth pigments, which affects the light supplement effect of plants. The growth pigment related to plant photosynthesis, phototropism and flowering and fruiting period is mainly phytochrome PR/PFRThe phytochrome can be mutually transformed by absorbing deep red light (600-800) to realize the effects of increasing the flowering period of plants and improving fruits. The fluorescent powder excitation type LED is a new illuminating device at present, and has the advantages of high efficiency, energy conservation, long service life and the like. The device mainly comprises an excitation chip and fluorescent powder, wherein the fluorescent powder plays a key role in light conversion. Therefore, the application effect of the LED plant growth lamp can be improved by preparing the high-performance far-red fluorescent powder.
In general, a phosphor is composed mainly of a host material and activator ions, and the host material provides a suitable lattice environment for the activator ions. The matrix materials of the fluorescent powder for the LED plant growth lamp mainly comprise aluminate, titanate, zirconate, phosphate, silicate, borate, fluoride, oxide and the like. Difference in ion doping of different activatorsThe luminescent properties of the matrix materials are different, but the oxides, the titanates and the zirconates have the advantages of simple synthesis, low cost, high luminescent efficiency and the like, thereby being beneficial to the application of the fluorescent powder in the agricultural field. The fluorescent powder taking LMTO as a substrate is a research hotspot at present because the fluorescent powder is easy to synthesize and cheap in raw materials. For example, Li2MgTiO4:Mn4+, Na+, K+As a design of a novel compact optical wavelength detector or spectrometer based on fluorescent powder. Li2MgTiO4:Mn4+, Hf4+The red component and thermal stability of WLEDs are enhanced for R-PIG optics. In Li2MgZrO4:Mn4+Ga in a concentration of 40%3+Ions are introduced into the phosphor, improving the thermal stability of the phosphor. At present, the LMTO substrate has less application research in the aspect of plant lamp, and is a fluorescent powder substrate structure for the plant lamp with great potential. As the activator ion, Eu is generally used for realizing far-red light emission3+、Sm3+Plasma rare earth ion and transition metal Mn4+Ions. Compared with rare earth elements, the transition metal elements have the advantages of abundant reserves and low price, and are beneficial to application in the agricultural field.
At present, the low quantum efficiency and the unsatisfactory thermal stability of the fluorescent powder are still the key and difficult problems of the current research of the fluorescent powder for LED plant growth lamps, and the methods of simple and efficient co-doping fluxing agent, defect construction and the like are mainly adopted to further optimize the quantum efficiency and the thermal stability of the fluorescent powder. Co-doping fluxes are one of the most cost effective methods to improve material properties, and are typically performed with short overall reaction times and low residual impurities. In general, flux materials can be melted into ionic liquids at relatively low temperatures, and as an effective chemical reaction medium, particle diffusion and phase formation occur in a high temperature liquid environment. Different fluorescent powder corresponds to different sintering aids. Defect modification methods are also a hot spot in the field of luminescent materials, but it is difficult to control the crystal distribution, type and depth. The invention can modify Li by co-doping fluxing agent or constructing defects2MgTiO4:Mn4+To makePreparing high-performance deep red light LED plant growth fluorescent powder.
Disclosure of Invention
The invention aims to provide a high-efficiency and high-thermal-stability plant growth lamp deep red LED fluorescent powder and a preparation method thereof, so as to solve the problems in the background technology. In addition, the co-doped fluxing agent BaF is adopted in the text2、NH4Cl and B2O3Influence and improvement of LMTO:xMn4+the luminescent property of the fluorescent powder. In addition, by adding a small amount of Ga3+Ion-build-up defect modified luminescent materials, when Ga3+Ion substituted Ti4+When ionic, oxygen vacancies may form to maintain the electroneutrality of the compound, so that in the LMTO matrix, GaTiThe doping can not only stabilize Mn4+And can also reduce Mn4+The symmetry of the sites results in a significant improvement in luminescence properties.
In order to achieve the purpose, the invention provides the following technical scheme:
a plant growth lamp used deep red fluorescent powder with chemical formula of Li2MTi(1-x-y)O4: xMn4+, yGa3+Wherein, 0<x≤1%，0<yLess than or equal to 0.5; the activating ion being Mn4+(ii) a The Li2MTiO4The substrate is double perovskite oxide, and the crystal structure of the double perovskite oxide belongs to a space group I41/amd(141) Has rich octahedral sites ([ TiO ]6]、[MO6]And [ LiO ]6]). The invention also provides a preparation method of the deep red light fluorescent powder for plant light supplement and illumination, which is characterized by comprising the following steps:
step (1): according to Li2MTi(1-x-y)O4: xMn4+, yGa3+Respectively weighing Li in the stoichiometric ratio2CO3 (AR), TiO2 , MgO (AR), ZnO(AR), Ga2O3 (AR) and MnO2 (AR) mixing and additionally weighing a proper amount of 1.0-3.0 wt% of a flux;
step (2): putting the obtained mixed product into an agate mortar, adding 2-10 ml of absolute ethyl alcohol, and then grinding for 20-50 min until the mixture is uniformly mixed;
and (3): placing the obtained sample powder in a quartz crucible, heating to 600-800 ℃ at a speed of 6 ℃/min, preheating for 6 h, then naturally cooling to room temperature, grinding again, improving uniformity, then continuously heating to 1100-1300 ℃ in an air environment, keeping the temperature for 2 h, and then naturally cooling to room temperature;
and (4): grinding the cooled solid sample in an agate mortar again to obtain the deep red Li2MTi(1-x-y)O4: xMn4+, yGa3+And (3) fluorescent powder.
Preferably, in said step 1), Li is weighed2CO3When the Li ions are evaporated at high temperature, the Li ions are added by 5mol percent;
preferably, in said step 1), Li2MTiO4M in the matrix is any one or a mixture of more of magnesium oxide and zinc oxide;
preferably, in the step 1), the concentration of Mn ions is between 0 and 1 percent;
preferably, in the step 1), the concentration of Ga ions is between 0 and 0.5;
preferably, in the step 1), the fluxing agent is BaF2, NH4Cl, B2O3Any one of the above;
preferably, in the step 2), the absolute ethyl alcohol is between 2 and 10 ml;
preferably, in the step 3), the sintering temperature is 1100-1300 ℃;
the invention provides a deep red Li for a plant growth lamp2MTi(1-x-y)O4: xMn4+, yGa3+The fluorescent powder emits visible light with wavelength of 600-800nm under the excitation of blue light. The invention also provides for the incorporation of Ga3+The ions further improve the luminescence properties. The invention adopts a high-temperature solid phase method, and has simple preparation process, safety and environmental protection.
The visible light region with the wavelength of 600-800nm of the emitted light spectrum is matched with the absorption range of plant growth pigment, so that the elongation of plant stems is regulated, and the formation of plant flower buds is promoted.
The invention weighs raw materials according to stoichiometric ratio, carries out solid phase reaction, further improves the luminescent property of the fluorescent material by introducing proper amount of fluxing agent, and obtains the high-efficiency and high-thermal stability crimson fluorescent powder suitable for plant growth.
The invention uses Li2MTiO4As a matrix, with Mn4+In order to activate ions, the raw materials and the final product do not contain toxic and harmful substances, the fluorescent powder has strong absorption on exciting light in a blue wave band, has visible light emission in a wavelength range of 600-800nm, and is suitable for being applied to the field of artificial light sources for plant growth lamps excited by blue light LED chips. The preparation method disclosed by the invention has the advantages of simple and convenient process, low cost, no pollution, low cost, suitability for industrial production and the like.
Mn of the invention4+Doping with Li2MTiO4The fluorescent material has strong absorption in a blue light area, emits visible light with the wavelength range of 600-800nm, and can be applied to the field of artificial light sources for plant growth lamps excited by blue light LED chips. Mn of the invention4+Doping with Li2MTiO4The fluorescent material has stable physical and chemical properties, does not react with oxygen, water, carbon dioxide and the like in the environment, and does not release any toxic and harmful substances in the using process. Mn of the invention4+Doping with Li2MTiO4The preparation process of the fluorescent material is simple, the preparation process has no pollution, and harsh reaction conditions are not needed.
Drawings
FIG. 1 shows Li synthesized by high temperature solid phase method2MTiO4 Mn4+, Ga4+Sample XRD pattern;
FIG. 2 is Li2MTiO4SEM image and crystal structure analysis of the sample.
FIG. 3 is Li2MgTiO4:Mn4+, Ga4+Excitation and emission profiles of the sample;
FIG. 4 is Li2MgTiO4:Mn4+, Ga4+Thermal stability of the sample;
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Example 1: li2MTi(1-x-y)O4: xMn4+, yGa3+
According to Li2MTi(1-x-y)O4: xMn4+, yGa3+(x=0, 0.2%, 0.4%, 0.6%, 0.8%, 1.0%; y=0, 0.1, 0.2, 0.3, 0.4, 0.5) stoichiometric ratio, and Li was weighed separately2CO3 (AR), TiO2(AR), MgO (AR), ZnO(AR), MnO2 (AR), Ga2O3 (AR) was mixed, and 5mol% of Li was additionally weighed2CO3Compensating for the Li ions evaporated at high temperature. Putting the obtained mixed product into an agate mortar, adding 5 mg of absolute ethyl alcohol, and then grinding for 20-50 min until the mixture is uniformly mixed. And then placing the obtained sample powder in a quartz crucible, heating to 600-800 ℃ at a speed of 6 ℃/min, preheating for 6 h, then naturally cooling to room temperature, grinding again, improving uniformity, then continuously heating to 1100-1300 ℃ in an air environment, keeping the temperature for 2 h, and then naturally cooling to room temperature. Finally, the obtained solid sample is put into an agate mortar again for grinding to obtain the deep red Li2MTi(1-x-y)O4: xMn4+, yGa3+And (3) fluorescent powder.
The sample was analyzed by x-ray powder diffraction and mixed with Li2MgTiO4Comparing with standard card, confirming that the obtained fluorescent powder is pure phase and is Li2MgTiO4Isomorphism, see fig. 1. The obtained fluorescent powder is subjected to spectral analysis, the emission range of a sample is about 600-800nm under the excitation of 476 nm blue light, and the obtained fluorescent powder is subjected to scanning electron microscope test and crystal structure analysis at the same time, as can be seen from figure 2, the fluorescent powder has uniform particle size distribution, and the crystal structure is a space baseI41/amd(141) The tetragonal system of (3). As can be seen from FIG. 3, the Ga ion-doped luminescence intensityThe degree is improved greatly, and the light intensity can be improved by 20 percent at most by combining with the modification of the fluxing agent. The fluorescent powder has better thermal stability, and as can be seen from figure 4, the thermal stability spectrogram can still keep 60% of the light intensity at room temperature at 150 ℃.
Example 2: li2MgTiO4: Mn4+, Ga3+, BaF2
According to Li2MgTi(1-x-y)O4: xMn4+, yGa3+(x=0, 0.2%, 0.4%, 0.6%, 0.8%, 1.0%; y=0, 0.1, 0.2, 0.3, 0.4, 0.5) stoichiometric ratio, and Li was weighed separately2CO3 (AR), TiO2(AR), MgO (AR), ZnO(AR), MnO2 (AR), Ga2O3 (AR) was mixed, and 5mol% of Li was additionally weighed2CO3Compensating for the Li ions evaporated at high temperature. Then weighing a proper amount of 1.0-3.0 wt% of fluxing agent BaF2. The obtained mixed product was put in an agate mortar, 5 mg of absolute ethanol was added, and then ground for 30 min until uniform mixing. And then placing the obtained sample powder in a quartz crucible, heating to 600 ℃ at the speed of 6 ℃/min, preheating for 6 h, then naturally cooling to room temperature, grinding again, improving the uniformity, then continuously heating to 1300 ℃ in an air environment, keeping the temperature for 2 h, and then naturally cooling to room temperature. Finally, the obtained solid sample is put into an agate mortar again for grinding to obtain the deep red Li2MTi(1-x-y)O4: xMn4+, yGa3+And (3) fluorescent powder. From XRD analysis in FIG. 1, it can be seen that a small amount of flux BaF is co-doped2The obtained fluorescent powder has no impurity introduced and is still in a pure phase. And the luminous intensity was increased by 18% as shown in fig. 2.
Example 3: li2MgTiO4: Mn4+, Ga3+, NH4Cl
According to Li2MgTi(1-x-y)O4: xMn4+, yGa3+(x=0, 0.2%, 0.4%, 0.6%, 0.8%, 1.0%; y=0, 0.1, 0.2, 0.3, 0.4, 0.5) stoichiometric ratio, and Li was weighed separately2CO3 (AR), TiO2(AR), MgO (AR), ZnO(AR), MnO2 (AR), Ga2O3 (AR) was mixed, and 5mol% of Li was additionally weighed2CO3Compensating for the Li ions evaporated at high temperature. Then weighing a proper amount of 1.0-3.0 wt% of flux NH4And (4) Cl. The obtained mixed product was put in an agate mortar, 5 mg of absolute ethanol was added, and then ground for 30 min until uniform mixing. And then placing the obtained sample powder in a quartz crucible, heating to 600 ℃ at the speed of 6 ℃/min, preheating for 6 h, then naturally cooling to room temperature, grinding again, improving the uniformity, then continuously heating to 1300 ℃ in an air environment, keeping the temperature for 2 h, and then naturally cooling to room temperature. Finally, the obtained solid sample is put into an agate mortar again for grinding to obtain the deep red Li2MTi(1-x-y)O4: xMn4+, yGa3+And (3) fluorescent powder. The phosphor was still pure phase as known from XRD analysis (figure 1). The co-doped NH is shown in the spectrum of FIG. 24The luminescence intensity after Cl is enhanced by 20%.
Example 4: li2MgTiO4: Mn4+, Ga3+, B2O3
According to Li2MgTi(1-x-y)O4: xMn4+, yGa3+(x=0, 0.2%, 0.4%, 0.6%, 0.8%, 1.0%; y=0, 0.1, 0.2, 0.3, 0.4, 0.5) stoichiometric ratio, and Li was weighed separately2CO3 (AR), TiO2(AR), MgO (AR), ZnO(AR), MnO2 (AR), Ga2O3 (AR) was mixed, and 5mol% of Li was additionally weighed2CO3Compensating for the Li ions evaporated at high temperature. Then weighing a proper amount of 2.0wt% of fluxing agent B2O3. The obtained mixed product was put in an agate mortar, 5 mg of absolute ethanol was added, and then ground for 30 min until uniform mixing. And then placing the obtained sample powder in a quartz crucible, heating to 600 ℃ at the speed of 6 ℃/min, preheating for 6 h, then naturally cooling to room temperature, grinding again, improving the uniformity, then continuously heating to 1300 ℃ in an air environment, keeping the temperature for 2 h, and then naturally cooling to room temperature. Finally, placing the obtained solid sample in an agate mortar again for grinding to obtain the productDeep red Li2MTi(1-x-y)O4: xMn4+, yGa3+And (3) fluorescent powder. From XRD analysis in FIG. 1, it can be seen that a small amount of flux B is co-doped2O3The fluorescence obtained after this is still pure phase and the spectrum of FIG. 2 shows an increase in the luminescence intensity of 16%.
The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A plant growth lamp used deep red fluorescent powder is characterized in that the chemical formula is Li2MTi(1-x-y)O4: xMn4+, yGa3+Wherein, 0<x≤1%，0<yLess than or equal to 0.5, M = Mg, Zn; the active ion of the fluorescent powder is Mn4+。
2. The crimson phosphor for a plant growth lamp according to claim 1, wherein: and M is one or more of metal elements Mg and Zn.
3. The crimson phosphor for a plant growth lamp according to claim 1, wherein: after the luminescent material and the blue 470 nm chip are excited, the emission wavelength is between 600 and 800 nm.
4. The crimson phosphor for the plant growth lamp according to claim 1, wherein the crimson phosphor is prepared by a high temperature solid phase method, and the high temperature solid phase preparation method comprises the following preparation steps:
(1) according to Li2MTi(1-x-y)O4: xMn4+, yGa3+Are respectively calledLi2CO3 (AR), TiO2(AR), MgO (AR), ZnO(AR), Ga2O3 (AR) and Mn ion-containing Compound were mixed, and 5mol% of Li was weighed2CO3Compensating for high temperature evaporated Li ions; in addition, weighing a proper amount of 1.0-3.0 wt% of fluxing agent: the fluxing agent is BaF2(AR), NH4Cl(AR), B2O3(AR);
(2) putting the mixed product obtained in the step (1) into an agate mortar, adding 2-10 mg of absolute ethyl alcohol, and then grinding for 20-50 min until the mixture is uniformly mixed;
(3) placing the sample powder obtained in the step (2) in a quartz crucible, heating to 600-800 ℃ at a speed of 6 ℃/min, preheating for 6 h, then naturally cooling to room temperature, grinding for 5-10 min again to improve uniformity, then continuously heating to 1100-1300 ℃ in an air environment, keeping the temperature for 2 h, and then naturally cooling to room temperature;
(4) grinding the solid sample obtained in the step (3) in an agate mortar for 10-20 min again to obtain the deep red Li2MTi(1-x-y)O4: xMn4+, yGa3+And (3) fluorescent powder.
5. The deep red phosphor for a plant growth lamp according to claim 1, wherein the luminous efficiency of the phosphor is increased by 20%; at 150 ℃, the emission intensity can still be maintained at 60% of room temperature.
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