CN117535051A - A, A + ,Pr 3+ Ion co-doped deep ultraviolet luminescent material, and preparation method and application thereof - Google Patents
A, A + ,Pr 3+ Ion co-doped deep ultraviolet luminescent material, and preparation method and application thereof Download PDFInfo
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- 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 claims description 7
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- 229910052712 strontium Inorganic materials 0.000 claims description 7
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 6
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- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 5
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 5
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- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- 238000004020 luminiscence type Methods 0.000 claims description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 4
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- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 4
- IATRAKWUXMZMIY-UHFFFAOYSA-N strontium oxide Chemical compound [O-2].[Sr+2] IATRAKWUXMZMIY-UHFFFAOYSA-N 0.000 claims description 4
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- POFFJVRXOKDESI-UHFFFAOYSA-N 1,3,5,7-tetraoxa-4-silaspiro[3.3]heptane-2,6-dione Chemical compound O1C(=O)O[Si]21OC(=O)O2 POFFJVRXOKDESI-UHFFFAOYSA-N 0.000 claims description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 2
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Abstract
The invention relates to A + ,Pr 3+ Ion co-doped deep ultraviolet luminescent material, preparation method and application thereof, in particular to A + ,Pr 3+ Ion co-doped Li 2 SrSiO 4 Deep ultraviolet luminescent material, and its preparation method and application are provided. The A is + ,Pr 3+ Ion co-doped Li 2 SrSiO 4 The chemical formula of the deep ultraviolet luminescent material is Li 2 SrSiO 4 ：xPr 3+ ，yA + Wherein A is + Is an alkali metal ion, preferably Na + Or/and K + ；0.005＜x＜0.015，0＜y≤0.25。
Description
Technical Field
The invention relates to A + ,Pr 3+ Ion co-doped deep ultraviolet luminescent material, preparation method and application thereof, in particular to A + (A + Is an alkali metal ion, preferably Na + Or/and K + ),Pr 3+ Ion co-doped Li 2 SrSiO 4 Deep ultraviolet luminescent material, and its preparation method and application are provided. Belongs to the field of light functional materials and deep ultraviolet light emitting.
Background
With the development of human civilization, people are paying more attention to the field of medical and health. Bacterial microorganisms can be transmitted through drinking water, food, etc. in a concealed manner. The sterilization can be realized in a physical mode and a chemical mode, the bacteria are broken and the viruses are inactivated in a chemical method through a pharmaceutical agent mode, however, the medicament residue after sterilization can be harmful to people, and the environment can be damaged if the sterilization agent is selected or treated improperly; the physical method is mainly to destroy the genetic material (DNA or RNA) of bacteria or viruses by ultraviolet rays so as to lose the transcription capacity, thereby achieving the aim of disinfection and sterilization. The ultraviolet (especially deep ultraviolet band) disinfection and sterilization technology has the remarkable advantages of high efficiency, broad spectrum and no secondary pollution, is only used for disinfection and sterilization in an illumination area, is almost effective for all bacteria and viruses, stops disinfection and sterilization when the articles are taken away, and does not harm human bodies and the environment.
The currently commonly used deep ultraviolet light source is a mercury lamp, and the emission peak of the emission spectrum is located at 254nm. However, in the field of sterilization, a light source having a center wavelength of about 265nm has proven to be the most effective sterilization wavelength, which is called "sterilization gold wavelength". Pr (Pr) 3+ Ion deep ultraviolet luminescence places stringent demands on the luminescent material matrix. In a common matrix such as yttrium aluminum garnet Y 3 Al 5 O 12 Aluminate SrAl 2 O 4 ZnGa gallate 2 O 4 Pr was not found in these materials 3+ Is a deep ultraviolet emission peak of (2). The matrix of the existing and effective deep ultraviolet luminescent material comprises Y 2 SiO 5 :Pr 3+ (see document Environmental Science)&Technology.2011,45,3680.)、Ca 2 Al 2 SiO 7 :Pr 3+ (see Nature communications.2020,11,2040.) Li 2 Na 1-x Ce x BP 2 O 8 (Chinese patent application No. 201910273198.3), srB x O 7 :Eu y ,Li z (chinese patent application No. 20110314523. X), and the like. However, the preparation technology of the above materials has yet to be improved, on the one hand, li 2 Na 1-x Ce x BP 2 O 8 The synthesis conditions are complex, and atmosphere treatment is needed, so that the manufacturing cost is further improved, and the commercial popularization and application are not facilitated; on the other hand, the emission peak of the existing ultraviolet luminescent material is 280-315nm, which is not close to the bactericidal gold wavelength (265 nm).
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide A + (A + Is an alkali metal ion, preferably Na + Or/and K + ),Pr 3+ Ion co-doped Li 2 SrSiO 4 Deep ultraviolet luminescent material, and its preparation method and application are provided. The Li is 2 SrSiO 4 ：xPr 3+ ,yA + The material has the characteristics of high luminous intensity in a deep ultraviolet band, and the preparation method has the advantages of mild condition, simple process, easy operation and capability of realizing mass production.
In one aspect, the present invention provides a + ,Pr 3+ Ion co-doped Li 2 SrSiO 4 Deep ultraviolet luminescent material, said A + ,Pr 3+ Ion co-doped Li 2 SrSiO 4 The chemical formula of the deep ultraviolet luminescent material is Li 2 SrSiO 4 :xPr 3+ ,yNa + Wherein A is + Is an alkali metal ion, preferably Na + Or/and K + ；0.005＜x＜0.015，0＜y≤0.25。
In the present disclosure, doped trivalent rare earth ion Pr 3+ Enter Li 2 SrSiO 4 When in the matrix lattice, the divalent Sr is replaced 2+ The ion is an aliovalent substitution. Trivalent rare earth ion Pr 3+ Constituting a luminescence center, electrons are stimulated to jump when light is irradiated on the material,corresponding to Pr 3+ A kind of electronic device 3 H 4 Energy level transition of 4f5 d. Electrons in the 4f5d energy level undergo a small stokes shift (non-radiative relaxation) and eventually the electrons release energy back to the ground state by a luminescent form (268 nm). When alkali metal ion A + (A is Na or K) incorporated into the host lattice as Na + Ion as an example, on the one hand, na + Fills in Li + Vacancy, so that the trap concentration in the material is reduced, and the pyroelectric light intensity is reduced by 2 orders of magnitude as shown in a pyroelectric spectrum in the drawing; on the other hand, na + The introduction of the catalyst plays a role of fluxing, so that the lattice volume is enlarged, and more Pr is generated 3+ Enters the unit cell to form a luminous center, and Pr is also reduced 3+ Is increased by Pr 3+ Dispersibility in materials, reduced Pr in the excited state 3+ The probability of cross relaxation (non-radiative relaxation) of the electrons in the light-emitting diode is increased, so that the luminous intensity is improved.
Preferably, x=0.01; or/and 0.05.ltoreq.y.ltoreq.0.25, preferably y=0.15. Preferably, li is ion co-doped 2 SrSiO 4 The deep ultraviolet luminous intensity of the deep ultraviolet luminous material is firstly enhanced and then weakened along with the doping content of the deep ultraviolet luminous material being more than 0 and less than or equal to 0.25, and the best is achieved when y=0.15.
Preferably, the luminescence wavelength of the deep ultraviolet luminescent material is in the deep ultraviolet band, and the central wavelength of the deep ultraviolet luminescent material is 268 and 310nm. A is that + ,Pr 3+ Ion co-doped Li 2 SrSiO 4 The emission peak value of the deep ultraviolet luminescent material in the deep ultraviolet band is at 268nm, and the deep ultraviolet luminescent material has the advantages of high luminous intensity and fitting with the wavelength of gold.
In another aspect, the present invention provides a + ,Pr 3+ Ion co-doped Li 2 SrSiO 4 The preparation method of the deep ultraviolet luminescent material comprises the following steps:
(1) Solid powder lithium source, strontium source, silicon source, praseodymium source, sodium source and potassium source are taken as raw materials to be weighed and mixed according to stoichiometric ratio, absolute ethyl alcohol is used for grinding (the grinding purpose is to increase the reaction area and accelerate the reaction rate), and presintering is carried out in air atmosphere at 500-700 ℃ to obtain presintering powder (the presintering can firstly discharge volatile components (such as C)O 2 ，H 2 O), promoting diffusion to obtain a homogeneous phase);
(2) Calcining the presintered powder in air atmosphere at 800-1000 ℃ to obtain the alkali metal ion A + (A is Na or K), pr 3+ Ion co-doped Li 2 SrSiO 4 Deep ultraviolet luminescent material.
In the present invention, a lithium source, a strontium source, a silicon source, a praseodymium source, and a sodium source (or/and a potassium source) are mixed and then burned in order to promote diffusion. Then calcining to make them produce solid-phase reaction so as to obtain the invented alkali metal ion A + (A is Na or K), pr 3+ Ion co-doped Li 2 SrSiO 4 Deep ultraviolet luminescent material. In the invention, A + ,Pr 3+ Ion co-doped Li 2 SrSiO 4 No special atmosphere is needed, the luminous intensity is high, and the luminous wavelength is well matched with the gold wavelength. The deep ultraviolet fluorescent powder has the emission peak value at 268nm, has better sterilization efficiency, and provides an attractive alternative scheme for replacing a common sterilization mercury lamp for the deep ultraviolet luminescent material doped with rare earth elements.
Preferably, the lithium source is a lithium-containing compound, preferably at least one of lithium carbonate and lithium oxide.
Preferably, the strontium source is a strontium-containing compound, preferably at least one of strontium carbonate and strontium oxide.
Preferably, the silicon source is a silicon-containing compound, preferably at least one of silicon dioxide, ethyl orthosilicate, and silicon carbonate.
Preferably, the sodium source is a sodium-containing compound, preferably at least one of sodium carbonate and sodium bicarbonate.
Preferably, the potassium source is a potassium-containing compound, preferably at least one of potassium carbonate and potassium bicarbonate.
Preferably, the praseodymium source is a praseodymium-containing compound, preferably hexapraseodymium undecanoxide (Pr 6 O 11 )。
Preferably, the presintering time is 2-8 hours; preferably, the temperature rising rate of the presintering is 3-10 ℃/min.
Preferably, the calcination time is 5-15 hours; preferably, the temperature rise rate of the calcination is 3 to 10 ℃/min.
In yet another aspect, the present invention provides a + ,Pr 3+ Ion co-doped Li 2 SrSiO 4 Application of deep ultraviolet luminescent material in sterilization and disinfection, marking field and optical anti-counterfeiting field, wherein A is as follows + ,Pr 3+ Ion co-doped Li 2 SrSiO 4 The luminescence wavelength of the deep ultraviolet luminescent material is in a deep ultraviolet band, the crystal field intensity of the luminescence center of Pr element is changed through doping, so that the energy level of the new energy level after energy level splitting is higher, the emission peak is allowed to be closer to the gold wavelength, and the central wavelength is 268nm and 310nm.
The beneficial effects are that:
1. the invention provides a brand new deep ultraviolet luminescent material, namely alkali metal ion A + (A is Na or K), pr 3+ Ion co-doped Li 2 SrSiO 4 ，Pr 3+ As a luminescence center, A + The defect concentration is regulated, the synthesis method adopts two-step heat treatment solid phase synthesis, the preparation process is simple, no atmosphere treatment is needed, and the preparation conditions are easy to control;
2. li in the invention 2 SrSiO 4 :xPr 3+ ,yA + The fluorescent powder has the advantages of high luminous intensity and high sterilization efficiency, and the luminous spectrum of the fluorescent powder relates to deep ultraviolet band emission (268 nm).
Drawings
FIG. 1 shows the doping of Na obtained in examples 1-5 and comparative example 1 + Concentration of Li 2 SrSiO 4 :xPr 3+ ,yNa + (x=0.01; y=0, 0.05, 0.1, 0.15, 0.2 and 0.25) X-ray diffraction pattern (XRD) and Li of the ultraviolet luminescent material 2 SrSiO 4 Standard X-ray diffraction spectrum.
FIG. 2 shows the doping of Na obtained in examples 1-5 and comparative example 1 + Concentration of Li 2 SrSiO 4 :xPr 3+ ,yNa + (x=0.01; y=0, 0.05, 0.1, 0.15, 0.2 and 0.25) photoluminescence spectra of the uv luminescent material under excitation at 240 nm.
FIG. 3 shows the doping of different Na obtained in example 3 and comparative example 1 + Concentration of Li 2 SrSiO 4 :xPr 3+ ,yNa + (x=0.01; y=0 and 0.15) pyroelectric spectrum of uv luminescent material.
FIG. 4 shows the doping of different alkali metal ions A obtained in examples 3, 6 and comparative example 1 + Li of (2) 2 SrSiO 4 :xPr 3+ ,yA + (x=0.01, y=0.15) and Li 2 SrSiO 4 :0.01Pr 3+ Photoluminescence spectrum of the phosphor at 240nm excitation.
Detailed Description
The invention is further illustrated by the following embodiments, which are to be understood as merely illustrative of the invention and not limiting thereof.
In the present invention, alkali metal ion A + (A is Na or K), pr 3+ Ion co-doped Li 2 SrSiO 4 Deep ultraviolet luminescent material, preparation method and application thereof, wherein the chemical formula of the deep ultraviolet luminescent material is Li 2 SrSiO 4 :xPr 3+ ,yA + Wherein Pr is 3+ The range of the value of (2) is 0.005<x≤0.015，A + The value range of (2) is more than 0 and less than or equal to 0.25. The A is + ,Pr 3+ Ion co-doped Li 2 SrSiO 4 The deep ultraviolet luminescent material has the advantages of high luminous intensity, high sterilization efficiency and the like, and is compatible with gold wavelength.
In the invention, the alkali metal ion A is prepared by adopting a two-step heat treatment solid phase synthesis method + (A is Na or K), pr 3+ Ion co-doped Li 2 SrSiO 4 The deep ultraviolet luminescent material has mild condition, simple process and easy operation, and can realize mass production.
The present invention will be further illustrated by the following examples. It is also to be understood that the following examples are given solely for the purpose of illustration and are not to be construed as limitations upon the scope of the invention, since numerous insubstantial modifications and variations will now occur to those skilled in the art in light of the foregoing disclosure. The specific process parameters and the like described below are also merely examples of suitable ranges, i.e., one skilled in the art can make a suitable selection from the description herein and are not intended to be limited to the specific values described below.
Example 1
According to the molar ratio of each element, namely Li to Sr to Si to Pr, namely Na=2 to 1 to 0.01 to 0.05 (corresponding to Pr doping amount x=0.01 and Na doping amount y=0.05), lithium carbonate (98%), strontium carbonate (99%), silicon dioxide (99.99%), hexapraseodymium undecanoxide (99%) and sodium bicarbonate (99.5%) are selected as raw materials, and the raw materials are respectively weighed into the weight amounts of 1.1310g,2.2368g,0.9014g,0.0258g and 0.0633g. Then adding a proper amount of absolute ethyl alcohol (the mass ratio of the powder to the ethyl alcohol is 1:1) into the mixed raw materials, and fully grinding the mixed raw materials in an agate mortar for 1 hour to uniformly mix the mixed raw materials to obtain mixed powder. And (3) placing the mixed powder into a box-type resistance furnace, heating from room temperature to 600 ℃ at a heating rate of 5 ℃/min, pre-treating for 6 hours in an air atmosphere, and cooling to obtain the presintered powder. Grinding the presintered powder again, placing into a box-type resistance furnace, heating from room temperature to 850 ℃ at a heating rate of 5 ℃/min, calcining for 4h under air atmosphere, and cooling to room temperature along with the furnace to obtain Li 2 SrSiO 4 :0.01Pr 3+ ,0.05Na + (x=0.05, y=0.05) pressure luminescent powder. The crystallinity of the synthesized powder is high, and the XRD diffraction phase analysis result shown in figure 1 is shown. The phosphor prepared in this example has a strong broadband emission peak at 268nm and a weak shoulder strap emission peak at 314nm under excitation at 240nm, which can be attributed to Pr 3+ 4f 1 5d 1 →4f 2 Is not shown in the drawings). See the results of the emission spectroscopy analysis shown in fig. 2.
Example 2
On the basis of example 1, na was increased + Doping amount. According to the molar ratio of Li to Sr to Si to Pr (corresponding to Pr doping amount x=0.01 and Na doping amount y=0.10), selecting lithium carbonate (98%), strontium carbonate (99%), silicon dioxide (99.99%), undecanoxyhexapraseodymium (99%) and sodium bicarbonate (99.5%) as raw materials, and weighing 1.1310g,2.2368g,0.9014g,0.0258g and 0.1266g respectively. Then adding proper amount of absolute ethyl alcohol (powder and powder) into the mixed raw materialsThe mass ratio of the ethanol is 1: 1) The mixture was thoroughly ground in an agate mortar for 1 hour, and then uniformly mixed to obtain a mixed powder. And (3) placing the mixed powder into a box-type resistance furnace, heating from room temperature to 600 ℃ at a heating rate of 5 ℃/min, pre-treating for 6 hours in an air atmosphere, and cooling to obtain the presintered powder. Grinding the presintered powder again, placing into a box-type resistance furnace, heating from room temperature to 850 ℃ at a heating rate of 5 ℃/min, calcining for 4h under air atmosphere, and cooling to room temperature along with the furnace to obtain Li 2 SrSiO 4 :0.01Pr 3+ ,0.05Na + (x=0.01, y=0.05) pressure luminescent powder. The crystallinity of the synthesized powder is high, and the XRD diffraction phase analysis result shown in figure 1 is shown. The phosphor prepared in this example was excited with 240nm light, had a strong broadband emission peak at 268nm, and exhibited a weak shoulder strap emission peak at 310nm, which could be attributed to Pr 3+ 4f 1 5d 1 →4f 2 Is not shown in the drawings). See the results of the emission spectroscopy analysis shown in fig. 2.
Example 3
The procedure for the preparation of luminescent material in this example 3 is described with reference to example 1, with the difference that: x=0.01, y=0.15, further increasing Na + Doping amount. The crystallinity of the synthesized powder is high, and the XRD diffraction phase analysis result shown in figure 1 is shown. The phosphor prepared in this example was excited with 240nm light, had a strong broadband emission peak at 268nm, and exhibited a weak shoulder strap emission peak at 310nm, which could be attributed to Pr 3+ 4f 1 5d 1 →4f 2 And the luminous intensity reaches a maximum. See the results of the emission spectroscopy analysis shown in fig. 2.
Example 4
The procedure for the preparation of luminescent material in this example 4 is described with reference to example 1, with the difference that: x=0.01, y=0.20, further increasing Na + Doping amount. The crystallinity of the synthesized powder is high, and the XRD diffraction phase analysis result shown in figure 1 is shown. The phosphor prepared in this example was excited with 240nm light, had a strong broadband emission peak at 268nm, and exhibited a weak shoulder strap emission peak at 310nm, which could be attributed to Pr 3+ 4f 1 5d 1 →4f 2 Is not shown in the drawings). See emission spectrum component shown in FIG. 2And (5) analyzing the result.
Example 5
The procedure for the preparation of luminescent material in example 5 is described with reference to example 1, with the difference that: x=0.01, y=0.25, i.e. further increase Na + Doping amount. The crystallinity of the synthesized powder is high, and the XRD diffraction phase analysis result shown in figure 1 is shown. The phosphor prepared in this example was excited with 240nm light, had a strong broadband emission peak at 268nm, and exhibited a weak shoulder strap emission peak at 310nm, which could be attributed to Pr 3+ 4f 1 5d 1 →4f 2 Is not shown in the drawings). See the results of the emission spectroscopy analysis shown in fig. 2.
Example 6
The procedure for the preparation of luminescent material in example 6 is described with reference to example 1, with the difference that: the A is taken + The ion is K + Ion, x=0.01, y=0.15. Lithium carbonate (98%), strontium carbonate (99%), silicon dioxide (99.99%), hexapraseodymium undecanoxide (99%) and potassium bicarbonate (99.5%) were selected as raw materials, and 1.1310g,2.2368g,0.9014g,0.0258g and 0.2264g were weighed respectively. The phosphor prepared in this example, which was excited with 240nm light, had a strong broadband emission peak at 268nm and a weak shoulder strap emission peak at 310nm, was attributed to Pr 3+ 4f 1 5d 1 →4f 2 Is not shown in the drawings). See the results of the emission spectroscopy analysis shown in FIG. 4.
Comparative example 1
The procedure for the preparation of the luminescent material in this comparative example 1 is described with reference to example 1, with the difference that: x=0.01, y=0, i.e. single doped Pr 3+ The element, the synthetic powder has high crystallinity, and the XRD diffraction phase analysis result shown in figure 1 is shown. The phosphor prepared in this example, which was excited with 240nm light, had a strong broadband emission peak at 268nm and a weak shoulder strap emission peak at 310nm, was attributed to Pr 3+ 4f 1 5d 1 →4f 2 With the alkali metal ions Na in examples 1 to 6 + Or K + And Pr (Pr) 3+ Single Pr doped luminescent material 3+ Has weaker luminous intensity, see the emission spectrum contrast of fig. 4. The pyroelectric spectrum is shown in FIG. 3As shown, pr in example 3 3+ And Na (Na) + Comparison of co-doped fluorescent materials revealed Pr 3+ The single doping has a strong thermoluminescence peak, namely a higher trap level density, so that electrons are easy to be bound in the trap and return to a ground state through non-radiative relaxation. Whereas co-doped alkali metal ions Na + 、K + Ion fills Li + Vacancy, reduced trap density, reduced Pr 3+ Is improved in dispersibility, pr 3+ The good dispersibility of (c) avoids cross relaxation of the emission center due to too close (similar to concentration quenching) and thus the luminous intensity is improved.
Finally, what is necessary here is: the above embodiments are only for further detailed description of the technical solutions of the present invention, and should not be construed as limiting the scope of the present invention, and some insubstantial modifications and adjustments made by those skilled in the art from the above description of the present invention are all within the scope of the present invention.
Claims (7)
1. A, A + ,Pr 3+ Ion co-doped Li 2 SrSiO 4 A deep ultraviolet luminescent material, characterized in that the A + ,Pr 3+ Ion co-doped Li 2 SrSiO 4 The chemical formula of the deep ultraviolet luminescent material is Li 2 SrSiO 4 ：xPr 3+ ，yA + Wherein A is + Is an alkali metal ion, preferably Na + Or/and K + ；0.005＜x＜0.015，0＜y≤0.25。
2. A according to claim 1 + ,Pr 3+ Ion co-doped Li 2 SrSiO 4 Deep ultraviolet luminescent material, characterized in that x=0.01; or/and 0.05.ltoreq.y.ltoreq.0.25, preferably y=0.15.
3. A as claimed in claim 1 or 2 + ,Pr 3+ Ion co-doped Li 2 SrSiO 4 The preparation method of the deep ultraviolet luminescent material is characterized by comprising the following steps:
(1) Weighing and mixing solid powder lithium source, strontium source, silicon source, praseodymium source, sodium source and potassium source as raw materials according to stoichiometric ratio, grinding with absolute ethyl alcohol, and presintering in air atmosphere at 500-700 ℃ to obtain presintering powder;
(2) Calcining the presintered powder in air atmosphere at 800-1000 ℃ to obtain the alkali metal ion A + ,Pr 3+ Ion co-doped Li 2 SrSiO 4 Deep ultraviolet luminescent material.
4. A method of preparation according to claim 3, wherein the lithium source is a lithium-containing compound, preferably at least one of lithium carbonate, lithium oxide;
the strontium source is a strontium-containing compound, preferably at least one of strontium carbonate and strontium oxide;
the silicon source is silicon-containing compound, preferably at least one of silicon dioxide, tetraethoxysilane and silicon carbonate;
the sodium source is a sodium-containing compound, preferably at least one of sodium carbonate and sodium bicarbonate;
the potassium source is a potassium-containing compound, preferably at least one of potassium carbonate and potassium bicarbonate;
the praseodymium source is a praseodymium-containing compound, preferably hexapraseodymium undecanoxide (Pr 6 O 11 ）。
5. The method according to claim 3 or 4, wherein the pre-firing time is 2 to 8 hours; preferably, the temperature rising rate of the presintering is 3-10 ℃/min.
6. The method according to any one of claims 3 to 5, wherein the calcination time is 5 to 15 hours; preferably, the temperature rise rate of the calcination is 3 to 10 ℃/min.
7. A as claimed in claim 1 or 2 + ,Pr 3+ Ion co-doped Li 2 SrSiO 4 Deep ultravioletThe application of the luminescent material in the sterilization and disinfection, marking fields and optical anti-counterfeiting fields is characterized in that the alkali metal ion A + ,Pr 3+ Ion co-doped Li 2 SrSiO 4 The luminescence wavelength of the deep ultraviolet luminescent material is in a deep ultraviolet band, the crystal field intensity of the luminescence center of Pr element is changed through doping, so that the energy level of the new energy level after energy level splitting is higher, the emission peak is allowed to be closer to the gold wavelength, and the central wavelength is 268nm and 310nm.
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