Multi-component rare earth oxide material with perovskite structure and preparation method of multi-component rare earth oxide material

Abstract

The invention relates to the technical field of synthesis of multi-component rare earth oxide materials, and provides a multi-component rare earth oxide material with a perovskite structure and a preparation method of the multi-component rare earth oxide material. Wherein the chemical formula of the multi-component rare earth oxide material is Na0. 5RE0. 5TiO3, and RE is one or more of rare earth elements Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu. The multi-component rare earth oxide material is good in thermal stability and chemical stability, good in crystallinity, flexible and adjustable in component and controllable in morphology and size.

Description

Technical Field

[0001] The present invention relates to the technical field of synthesis of multi-component rare earth oxide materials, and in particular to a multi-component rare earth oxide material with a perovskite structure and a preparation method thereof. Background Art

[0002] Compared with existing binary / ternary oxide materials, multi-component oxide materials have richer physical and chemical properties due to the additional components. They are a class of materials with broad application potential and play an important role in energy storage, catalysis, optoelectronics, and sensing.

[0003] Rare earths have special electronic structures and unique physical and chemical properties, which give multi-component rare earth oxide materials many excellent properties, such as high temperature stability, good conductivity, high catalytic efficiency, excellent optical properties and magnetism.

[0004] High-temperature solid-phase method and wet chemical method are two major types of methods for synthesizing multi-component rare earth oxide materials that have been widely studied. Generally, high-temperature solid-phase method requires high sintering temperature (above 1000℃) and long calcination time (more than 6h) to overcome the obstacles brought by solid-state diffusion, thereby producing solid-state reactions between oxide or carbonate precursors. This process usually produces highly crystalline agglomerates (several microns), however, it has poor control over particle size and morphology, which is exactly what is needed to achieve the best performance of the material; due to the relatively mild and controllable liquid phase diffusion of wet chemical methods, such as sol-gel, solution combustion, co-precipitation and hydrothermal methods have been widely studied.

[0005] However, these existing methods still have some shortcomings in practice. First, the control of synthesis conditions needs to be more precise to achieve the desired material structure and properties; second, the interaction and compatibility between different elements in multi-component rare earth oxide materials need to be studied and explored more deeply; in addition, the control of impurities in existing methods is still a challenge, and the preparation of high-purity materials still has certain difficulties; in addition, the scalability and economy of existing methods also need to be further improved to meet the needs of large-scale production; finally, the optimization of structure and performance requires more precise control and understanding to achieve the best performance of multi-component rare earth oxide materials. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention provides a multi-component rare earth oxide material with a perovskite structure and a preparation method thereof, so as to realize the preparation of a multi-component rare earth oxide material with a perovskite structure having high purity, good uniformity and controllable morphology and size.

[0007] The present invention provides a multi-component rare earth oxide material with a perovskite structure. The chemical formula of the multi-component rare earth oxide material is: Na 0.5 RE 0.5 TiO 3 Among them, RE is one or more of the rare earth elements Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu.

[0008] According to a multi-component rare earth oxide material with a perovskite structure provided by the present invention, RE in the chemical formula 0.5 for: Sc a Y b La c Ce d Pr e Nd f Pm g Sm h Eu i G j Tb k Dy l Ho m Er n Tm o Yb p Lu q Among them, a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q are molar coefficients; Among them, 0≤a≤0.5, 0≤b≤0.5, 0≤c≤0.5, 0≤d≤0.5, 0≤e≤0.5, 0≤f≤0.5, 0≤g≤0.5, 0≤h≤0.5, 0≤i≤0.5, 0≤j≤0.5, 0≤k≤0.5, 0≤l≤0.5, 0≤m≤0.5, 0≤n≤0.5, 0≤o≤0.5, 0≤p≤0.5, 0≤q≤0.5, and a+b+c+d+e+f+g+h+i+j+k+l+m+n+o+p+q=0.5.

[0009] The present invention also provides a method for preparing a multi-component rare earth oxide material with a perovskite structure, which is used to prepare the multi-component rare earth oxide material with a perovskite structure as described above, comprising the following steps: S100, weighing a rare earth compound and a titanium compound; S200, mixing a rare earth compound and a titanium compound to obtain a mixture; adding the mixture to water, stirring at a first preset temperature and a first preset stirring speed for a first preset time to obtain a water system of a precursor; S300, weighing sodium hydroxide and adding it to the water system of the precursor, stirring it at a second preset temperature and a second preset stirring speed for a second preset time to gel it; S400, adding the gelled precursor into a stainless steel hydrothermal reactor to perform a gel hydrothermal crystallization reaction to obtain a reaction product; S500, centrifugally washing the reaction product with ultrapure water to obtain a multi-component rare earth oxide material with a perovskite structure.

[0010] According to a method for preparing a multi-component rare earth oxide material with a perovskite structure provided by the present invention, the rare earth compound includes rare earth oxides, rare earth halides, rare earth acetylacetonates, rare earth hydroxides, rare earth phosphates, rare earth carbonates, rare earth chlorates, rare earth sulfates, rare earth organic complexes, rare earth nitrates or rare earth acetates.

[0011] According to a method for preparing a multi-component rare earth oxide material with a perovskite structure provided by the present invention, the titanium compound includes titanium oxide, titanium halide, titanium nitride, titanium carbide, titanium boride, titanium silicide, titanium hydroxide, titanium sulfate or an organic titanium compound. According to a method for preparing a multi-component rare earth oxide material with a perovskite structure provided by the present invention, in the step S200, either, a rare earth compound is added / dispersed in water to obtain an aqueous system of the rare earth compound; a titanium compound is added / dispersed in water to obtain an aqueous system of the titanium compound; the aqueous system of the rare earth compound and the aqueous system of the titanium compound are mixed to obtain a mixed solution, and the mixed solution is stirred at a first preset temperature and a first set stirring speed for a first set time to obtain an aqueous system of the precursor; Or, one or more of the rare earth compounds are added / dispersed in water to obtain a water system of rare earth compounds; a titanium compound is added / dispersed in water to obtain a water system of titanium compounds; the water system of the rare earth compounds, the water system of the titanium compounds and one or more other rare earth compounds are mixed to obtain a mixed solution, and the mixed solution is stirred at a first preset temperature and a first set stirring speed for a first set time to obtain a water system of the precursor; Or, one or more of the rare earth compounds are added / dispersed in water to obtain an aqueous system of rare earth compounds; the aqueous system of the rare earth compounds, a titanium compound, and one or more other rare earth compounds are mixed to obtain a mixed solution, and the mixed solution is stirred at a first preset temperature and a first preset stirring speed for a first preset time to obtain an aqueous system of the precursor; Alternatively, a rare earth compound is added / dispersed in water to obtain an aqueous system of the rare earth compound; a titanium compound is added to the aqueous system of the rare earth compound, mixed to obtain a mixed solution, and the mixed solution is stirred at a first preset temperature and a first preset stirring speed for a first preset time to obtain an aqueous system of the precursor;

[0012] Alternatively, a titanium compound is added / dispersed in water to obtain an aqueous system of the titanium compound; a rare earth compound is added to the aqueous system of the titanium compound, mixed to obtain a mixed solution, and the mixed solution is stirred at a first preset temperature and a first set stirring speed for a first set time to obtain an aqueous system of the precursor.

[0013] According to a method for preparing a multi-component rare earth oxide material with a perovskite structure provided by the present invention, in the step S200, the first preset temperature is 5°C~95°C, the first set stirring speed is 50 rpm~1000 rpm, and the first set time is 1h~48h. According to a method for preparing a multi-component rare earth oxide material with a perovskite structure provided by the present invention, in the step S300, the molar ratio of sodium hydroxide to the metal element in the raw material is (5-300):1;

[0014] The second preset temperature is 5° C. to 95° C., the second set stirring speed is 50 rpm to 1000 rpm, and the second set time is 1 h to 48 h. According to a method for preparing a multi-component rare earth oxide material with a perovskite structure provided by the present invention, in the step S400, the stainless steel hydrothermal reactor is provided with an inner lining, and the material of the inner lining is modified polytetrafluoroethylene or para-polyphenol;

[0015] The reaction temperature in the stainless steel hydrothermal reactor is 100° C. to 300° C., and the reaction time is 0.1 h to 100 h.

[0016] A method for preparing a multi-component rare earth oxide material with a perovskite structure provided by the present invention further comprises: S600, collecting the liquid phase solution separated by centrifugal washing in step S500, heating and distilling the liquid phase solution to concentrate it, and obtaining a concentrated aqueous dispersion of sodium hydroxide.

[0017] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: The present invention provides a multi-component rare earth oxide material with a perovskite structure and a preparation method thereof. The multi-component rare earth oxide material has good thermal stability and chemical stability, good crystallinity, flexible and adjustable components, a polydispersity value below 10%, a size that is precisely adjustable between 100nm and 5000nm, a morphology that is precisely adjustable between a cube and an Archimedean polyhedron, and the content and proportion of each rare earth element can be adjusted at will. While maintaining high crystallinity, the multi-component rare earth oxide material also has very good stability and monodispersity.

[0018] The preparation method provided by the present invention has the advantages of simple operation, easy scalability, environmental friendliness, easy control and manipulation of the growth environment, etc. As for the obtained product, the crystal structure, particle size distribution and surface morphology and the properties determined thereby can be adjusted as required. In terms of processing, the synthesis parameters (concentration, time, temperature, precursor) can be precisely controlled to achieve the purpose of controlling the obtained product.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 The multi-component rare earth oxide material Na of the perovskite structure prepared in Example 1 of the present invention 0.5 G 0.5 TiO 3 X-ray diffraction pattern.

[0022] Figure 2 The multi-component rare earth oxide material Na of the perovskite structure prepared in Example 2 of the present invention 0.5 Y 0.4 Eu 0.1 TiO 3 X-ray diffraction pattern of .

[0023] Figure 3 The multi-component rare earth oxide material Na of the perovskite structure prepared in Example 2 of the present invention 0.5 Y 0.4 Eu 0.1 TiO 3 Excitation spectrum and down-conversion emission spectrum.

[0024] Figure 4 The multi-component rare earth oxide material Na of the perovskite structure prepared in Example 3 of the present invention 0.5 Y 0.395 Yb 0.1 Tm 0.005 TiO 3 X-ray diffraction pattern of .

[0025] Figure 5 The multi-component rare earth oxide material Na of the perovskite structure prepared in Example 3 of the present invention 0.5Y 0.395 Yb 0.1 Tm 0.005 TiO 3 Excitation spectrum and upconversion emission spectrum.

[0026] Figure 6 The multi-component rare earth oxide material Na of the perovskite structure prepared in Example 4 of the present invention 0.5 Y 0.22 La 0.02 Ce 0.02 Pr 0.02 Nd 0.02 Sm 0.02 Eu 0.02 G 0.02 Tb 0.02 Dy 0.02 Ho 0.02 Er 0.02 Tm 0.02 Yb 0.02 Lu 0.02 TiO 3 X-ray diffraction pattern of .

[0027] Figure 7 The multi-component rare earth oxide material Na of the perovskite structure prepared in Example 4 of the present invention 0.5 Y 0.22 La 0.02 Ce 0.02 Pr 0.02 Nd 0.02 Sm 0.02 Eu 0.02 G 0.02 Tb 0.02 Dy 0.02 Ho 0.02 Er 0.02 Tm 0.02 Yb 0.02 Lu 0.02 TiO 3 Scanning electron microscope image of .

[0028] Figure 8 The Na with a cubic morphology prepared in Example 5 of the present invention 0.5 Y 0.2 Yb 0.2 Er 0.1 TiO 3 Scanning electron microscope image of .

[0029] Fig. 9 The Na with truncated cube morphology prepared in Example 6 of the present invention 0.5 Y 0.2 Yb 0.2 Er 0.1 TiO3 Scanning electron microscope image of .

[0030] Fig.10 The Na with truncated cube morphology prepared in Example 7 of the present invention 0.5 Y 0.2 Yb 0.2 Er 0.1 TiO 3 Scanning electron microscope image of .

[0031] Fig.11 The Na with truncated cube morphology prepared in Example 8 of the present invention 0.5 Y 0.2 Yb 0.2 Er 0.1 TiO 3 Scanning electron microscope image of .

[0032] Fig.12 The Na with a size of 360 nm prepared in Example 9 of the present invention 0.5 Y 0.2 Yb 0.2 Ho 0.1 TiO 3 Scanning electron microscope image of .

[0033] Fig.13 The Na with a size of 680 nm prepared in Example 10 of the present invention 0.5 Y 0.2 Yb 0.2 Ho 0.1 TiO 3 Scanning electron microscope image of .

[0034] Fig.14 The Na with a size of 1050 nm prepared in Example 11 of the present invention 0.5 Y 0.2 Yb 0.2 Ho 0.1 TiO 3 Scanning electron microscope image of .

[0035] Fig.15 The Na with a size of 5010 nm prepared in Example 12 of the present invention 0.5 Y 0.2 Yb 0.2 Ho 0.1 TiO 3 Scanning electron microscope image of . DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0038] Combine the following Figures 1 to 15 The present invention describes a multi-component rare earth oxide material with a perovskite structure and a preparation method thereof and related embodiments.

[0039] The present invention provides a multi-component rare earth oxide material with a perovskite structure. The chemical formula of the multi-component rare earth oxide material is: Na 0.5 RE 0.5 TiO 3 Among them, RE is one or more of the rare earth elements Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu.

[0040] According to a multi-component rare earth oxide material with a perovskite structure provided by the present invention, RE in the chemical formula 0.5 for: Sc a Y b La c Ce d Pr e Nd f Pm g Sm h Eu i G j Tb k Dy l Ho m Er n Tm o Ybp Lu q Among them, a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q are molar coefficients; Among them, 0≤a≤0.5, 0≤b≤0.5, 0≤c≤0.5, 0≤d≤0.5, 0≤e≤0.5, 0≤f≤0.5, 0≤g≤0.5, 0≤h≤0.5, 0≤i≤0.5, 0≤j≤0.5, 0≤k≤0.5, 0≤l≤0.5, 0≤m≤0.5, 0≤n≤0.5, 0≤o≤0.5, 0≤p≤0.5, 0≤q≤0.5, and a+b+c+d+e+f+g+h+i+j+k+l+m+n+o+p+q=0.5.

[0041] The multi-component rare earth oxide material Na of the perovskite structure of the present invention 0.5 RE 0.5 TiO 3 The components are flexible and adjustable, and the content and proportion of each rare earth element can be adjusted at will. While maintaining high crystallinity, it also has very good stability and monodispersity.

[0042] The multi-component rare earth oxide material of the perovskite structure of the present invention has good thermal stability and chemical stability, good crystallinity, a polydispersity value below 10%, a size that is precisely adjustable between 100nm and 5000nm, and a morphology that is precisely adjustable between a cube and an Archimedean polyhedron.

[0043] It should be noted that the multi-component rare earth oxide material with a perovskite structure provided by the present invention is a photoelectric multifunctional material, which can achieve the required performance in the field of up-conversion emission and down-conversion emission by precisely selecting and combining the rare earth elements in the material. It also has great application potential in the fields of energy storage, catalysis, optoelectronics and sensing.

[0044] The following is a description of a method for preparing a multi-component rare earth oxide material with a perovskite structure provided by the present invention. The method for preparing a multi-component rare earth oxide material with a perovskite structure described below and the multi-component rare earth oxide material with a perovskite structure described above can be referred to in correspondence with each other.

[0045] The present invention also provides a method for preparing a multi-component rare earth oxide material with a perovskite structure, which is used to prepare the multi-component rare earth oxide material with a perovskite structure as described above, comprising the following steps: S100, weighing a rare earth compound and a titanium compound; S200, mixing a rare earth compound and a titanium compound to obtain a mixture; adding the mixture to water, stirring at a first preset temperature and a first preset stirring speed for a first preset time to obtain a water system of a precursor; S300, weighing sodium hydroxide and adding / dispersing it in water to obtain a sodium hydroxide water system, and adding the sodium hydroxide water system to the precursor water system; or adding the weighed sodium hydroxide in solid form to the precursor water system, stirring at a second preset temperature and a second set stirring speed for a second set time to gel the solution; S400, adding a gel precursor into a stainless steel hydrothermal reactor to perform a gel hydrothermal crystallization reaction to obtain a reaction product; S500, centrifugally washing the reaction product with ultrapure water to obtain a multi-component rare earth oxide material with a perovskite structure.

[0046] According to a method for preparing a multi-component rare earth oxide material with a perovskite structure provided by the present invention, the rare earth compound includes rare earth oxides, rare earth halides, rare earth acetylacetonates, rare earth hydroxides, rare earth phosphates, rare earth carbonates, rare earth chlorates, rare earth sulfates, rare earth organic complexes, rare earth nitrates or rare earth acetates.

[0047] According to a method for preparing a multi-component rare earth oxide material with a perovskite structure provided by the present invention, the titanium compound includes titanium oxide, titanium halide, titanium nitride, titanium carbide, titanium boride, titanium silicide, titanium hydroxide, titanium sulfate or an organic titanium compound. According to a method for preparing a multi-component rare earth oxide material with a perovskite structure provided by the present invention, in the step S200, either, a rare earth compound is added / dispersed in water to obtain an aqueous system of the rare earth compound; a titanium compound is added / dispersed in water to obtain an aqueous system of the titanium compound; the aqueous system of the rare earth compound and the aqueous system of the titanium compound are mixed to obtain a mixed solution, and the mixed solution is stirred at a first preset temperature and a first set stirring speed for a first set time to obtain an aqueous system of the precursor; Or, one or more of the rare earth compounds are added / dispersed in water to obtain a water system of rare earth compounds; a titanium compound is added / dispersed in water to obtain a water system of titanium compounds; the water system of the rare earth compounds, the water system of the titanium compounds and one or more other rare earth compounds are mixed to obtain a mixed solution, and the mixed solution is stirred at a first preset temperature and a first set stirring speed for a first set time to obtain a water system of the precursor; Or, one or more of the rare earth compounds are added / dispersed in water to obtain an aqueous system of rare earth compounds; the aqueous system of the rare earth compounds, a titanium compound, and one or more other rare earth compounds are mixed to obtain a mixed solution, and the mixed solution is stirred at a first preset temperature and a first preset stirring speed for a first preset time to obtain an aqueous system of the precursor; Alternatively, a rare earth compound is added / dispersed in water to obtain an aqueous system of the rare earth compound; a titanium compound is added to the aqueous system of the rare earth compound, mixed to obtain a mixed solution, and the mixed solution is stirred at a first preset temperature and a first preset stirring speed for a first preset time to obtain an aqueous system of the precursor;

[0048] Alternatively, a titanium compound is added / dispersed in water to obtain an aqueous system of the titanium compound; a rare earth compound is added to the aqueous system of the titanium compound, mixed to obtain a mixed solution, and the mixed solution is stirred at a first preset temperature and a first set stirring speed for a first set time to obtain an aqueous system of the precursor.

[0049] According to a method for preparing a multi-component rare earth oxide material with a perovskite structure provided by the present invention, in the step S200, the first preset temperature is 5°C~95°C, the first set stirring speed is 50 rpm~1000 rpm, and the first set time is 1h~48h. According to a method for preparing a multi-component rare earth oxide material with a perovskite structure provided by the present invention, in the step S300, the molar ratio of sodium hydroxide to the metal element in the raw material is (5-300):1;

[0050] The second preset temperature is 5° C. to 95° C., the second set stirring speed is 50 rpm to 1000 rpm, and the second set time is 1 h to 48 h. According to a method for preparing a multi-component rare earth oxide material with a perovskite structure provided by the present invention, in the step S400, the stainless steel hydrothermal reactor is provided with an inner lining, and the material of the inner lining is modified polytetrafluoroethylene or para-polyphenol;

[0051] The reaction temperature in the stainless steel hydrothermal reactor is 100° C. to 300° C., and the reaction time is 0.1 h to 100 h.

[0052] A method for preparing a multi-component rare earth oxide material with a perovskite structure provided by the present invention further comprises: S600, collecting the liquid phase solution separated by centrifugal washing in step S500, heating and distilling the liquid phase solution to concentrate it, and obtaining a concentrated aqueous dispersion of sodium hydroxide, which can be used again in step S300 or stored for future use.

[0053] The preparation method provided by the present invention has the advantages of simple operation, easy scalability, environmental friendliness, easy control and manipulation of the growth environment, etc. As for the obtained product, the crystal structure, particle size distribution and surface morphology and the properties determined thereby can be adjusted as required. In terms of processing, the synthesis parameters (concentration, time, temperature, precursor) can be precisely controlled to achieve the purpose of controlling the obtained product.

[0054] The present invention utilizes the gel hydrothermal crystallization method to construct a multi-component rare earth oxide material library with infinite possible combinations. Through the precise control of the synthesis conditions, the preparation of rare earth oxide materials with high purity, good uniformity, and precisely adjustable morphology and size is achieved. On this basis, the structure and performance optimization of the multi-component rare earth oxide materials is achieved, and its application performance and efficiency are improved. In addition, the method is also scalable and economical, and can meet the needs of large-scale production. Example 1

[0055] This embodiment provides a multi-component rare earth oxide material Na containing a rare earth element in a perovskite structure. 0.5 G 0.5 TiO 3 The preparation method specifically comprises the following steps: S100, raw materials are selected from gadolinium nitrate and titanium dioxide, according to Na 0.5 G 0.5 TiO 3 The selected raw materials are weighed in the stoichiometric ratio of Gd and Ti elements, that is, gadolinium nitrate and titanium dioxide are weighed in the ratio of 0.5:1; S200, mixing the weighed gadolinium nitrate and solid titanium dioxide uniformly and adding them into deionized water to prepare a water dispersion system; then, stirring at a rate of 100 rpm and a stirring time of 1 h at 30° C. to obtain a water dispersion system of the precursor; S300, weighing sodium hydroxide according to a molar ratio of sodium hydroxide to metal elements (Gd element and Ti element) of 10:1, and dissolving it in deionized water to prepare a water dispersion system, and then adding it to the water dispersion system of the precursor obtained in S200, stirring at a rate of 100 rpm at 30° C. for 1 h to obtain a gelled precursor; S400, transferring the gelled precursor obtained in S300 to a stainless steel hydrothermal reactor with a modified polytetrafluoroethylene liner for gel hydrothermal crystallization, wherein the reaction temperature is 200° C. and the reaction time is 6 h; S500, after the reaction is completed and cooled to room temperature, the reaction product is taken out from the modified polytetrafluoroethylene liner in S400, and the multi-component rare earth oxide material with the perovskite structure is obtained after centrifugal washing with ultrapure water for 3 times, and the multi-component rare earth oxide material is vacuum dried at 40° C. for 4 hours and stored in the form of solid powder; S600, collecting the liquid phase solution separated in step S500, concentrating it by heating and distilling, obtaining a concentrated aqueous dispersion of sodium hydroxide, and using it again in step S300.

[0056] like Figure 1 As shown, the obtained material presents a single perovskite structure, has no impurities, and has high crystallinity. Example 2

[0057] This embodiment provides a multi-component rare earth oxide material Na containing two rare earth elements in a perovskite structure. 0.5 Y 0.4 Eu 0.1 TiO 3 The preparation method specifically comprises the following steps: S100, the raw materials are yttrium acetate, europium nitrate and tetrabutyl titanate, according to Na 0.5 Y 0.4 Eu 0.1 TiO 3 The selected raw materials are weighed in the stoichiometric ratio of Y, Eu and Ti elements, that is, yttrium acetate, europium nitrate and tetrabutyl titanate are weighed in the ratio of 0.4:0.1:1; S200, adding the weighed yttrium acetate and europium nitrate into ultrapure water to prepare an aqueous dispersion system, and then adding tetrabutyl titanate into ultrapure water to prepare an aqueous dispersion system, and liquid-liquid mixing the aqueous dispersion systems of the two; then, stirring at a rate of 500 rpm and a stirring time of 2 h at 20° C. to obtain an aqueous dispersion system of the precursor; S300, weighing sodium hydroxide according to a molar ratio of sodium hydroxide to metal elements (Y element, Eu element and Ti element) of 20:1, adding the weighed sodium hydroxide in solid form to the aqueous dispersion system of the precursor obtained in S200, stirring at a rate of 500 rpm at 20° C. for 2 h, to obtain a gelled precursor; S400, transferring the gelled precursor obtained in S300 to a stainless steel hydrothermal reactor with a modified polytetrafluoroethylene liner for gel hydrothermal crystallization, wherein the reaction temperature is 220° C. and the reaction time is 12 h; S500, after the reaction is completed and cooled to room temperature, the reaction product is taken out from the modified polytetrafluoroethylene liner in S400, and the multi-component rare earth oxide material with perovskite structure is obtained after centrifugal washing with ultrapure water for 3 times, and the multi-component rare earth oxide material is dispersed in ultrapure water for storage; S6. Collect the liquid phase solution separated in step S500, and concentrate it by heating and distillation to obtain a concentrated aqueous dispersion of sodium hydroxide, which is used again in step S300.

[0058] like Figure 2As shown, the material presents a single perovskite structure, has no impurities, and has high crystallinity.

[0059] like Figure 3 As shown, the material exhibits a red emission peak under excitation at 365 nm. Example 3

[0060] This embodiment provides a multi-component rare earth oxide material Na containing three rare earth elements in a perovskite structure. 0.5 Y 0.395 Yb 0.1 Tm 0.005 TiO 3 The preparation method specifically comprises the following steps: S100, the raw materials are yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, thulium oxide and titanium nitride, according to Na 0.5 Y 0.395 Yb 0.1 Tm 0.005 TiO 3 The selected raw materials are weighed in the stoichiometric ratio of Y, Yb, Tm and Ti elements, that is, yttrium chloride, ytterbium nitrate, thulium oxide and titanium nitride are weighed in the ratio of 0.395:0.1:0.005:1; S200, adding weighed yttrium chloride hexahydrate and ytterbium nitrate pentahydrate into ultrapure water to prepare an aqueous dispersion system, and then adding thulium oxide and titanium nitride into the aqueous dispersion system of the former to perform solid-liquid mixing; thereafter, stirring at a rate of 350 rpm and a stirring time of 3 h at 50° C. to obtain an aqueous dispersion system of the precursor; S300, weighing sodium hydroxide according to a molar ratio of sodium hydroxide to metal elements (Y element, Yb element, Tm element and Ti element) of 50:1, adding the weighed sodium hydroxide in solid form to the aqueous dispersion system of the precursor obtained in S200, stirring at 50° C. at a rate of 350 rpm for 3 h, to obtain a gelled precursor; S400, transferring the gel precursor obtained in S300 to a stainless steel hydrothermal reactor lined with para-polyphenol for gel hydrothermal crystallization, wherein the reaction temperature is 260° C. and the reaction time is 12 h; S500, after the reaction is completed and cooled to room temperature, the reaction product is taken out from the para-polyphenol lining in S400, and the multi-component rare earth oxide material with perovskite structure is obtained after centrifugal washing with ultrapure water for 3 times, and the multi-component rare earth oxide material is vacuum dried at 80° C. for 1 hour and stored in the form of solid powder; S600, collecting the liquid phase solution separated in step S500, concentrating it by heating and distilling, obtaining a concentrated aqueous dispersion of sodium hydroxide, and storing it for later use.

[0061] like Figure 4As shown, the material presents a single perovskite structure, has no impurities, and has high crystallinity.

[0062] like Figure 5 As shown, under excitation at 980 nm, blue and red emission peaks are displayed. Example 4

[0063] This embodiment provides a multi-component rare earth oxide material Na containing 15 rare earth elements in a perovskite structure. 0.5 Y 0.22 La 0.02 Ce 0.02 Pr 0.02 Nd 0.02 Sm 0.02 Eu 0.02 G 0.02 Tb 0.02 Dy 0.02 Ho 0.02 Er 0.02 Tm 0.02 Yb 0.02 Lu 0.02 TiO 3 The preparation method specifically comprises the following steps: S100, the raw materials are yttrium chloride hexahydrate, lanthanum nitrate hexahydrate, cerium chloride, praseodymium nitrate hexahydrate, neodymium acetate, nitrate hexahydrate, europium chloride, gadolinium chloride, terbium nitrate hexahydrate, dysprosium chloride hexahydrate, holmium acetate hydrate, erbium acetate tetrahydrate, thulium chloride, ytterbium chloride, lutetium nitrate and titanium carbide, according to Na 0.5 Y 0.22 La 0.02 Ce 0.02 Pr 0.02 Nd 0.02 Sm 0.02 Eu 0.02 G 0.02 Tb 0.02 Dy 0.02 Ho 0.02 Er 0.02 Tm 0.02 Yb 0.02 Lu 0.02 TiO 3Weigh the selected raw materials according to the stoichiometric ratio of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Ti elements, that is, weigh yttrium chloride hexahydrate, lanthanum nitrate hexahydrate, cerium chloride, praseodymium nitrate hexahydrate, neodymium acetate, nitrate hexahydrate, europium chloride, gadolinium chloride, terbium nitrate hexahydrate, dysprosium chloride hexahydrate, holmium acetate hydrate, erbium acetate tetrahydrate, thulium chloride, ytterbium chloride, lutetium nitrate and titanium carbide according to the ratio of 0.22:0.02:0.02:0.02:0.02:0.02:0.02:0.02:0.02:0.02:0.02:0.02:1; S200, adding weighed yttrium chloride hexahydrate, lanthanum nitrate hexahydrate, cerium chloride, praseodymium nitrate hexahydrate, neodymium acetate, nitrate hexahydrate, europium chloride, gadolinium chloride, terbium nitrate hexahydrate, dysprosium chloride hexahydrate, holmium acetate hydrate, erbium acetate tetrahydrate, thulium chloride, ytterbium chloride, and lutetium nitrate into distilled water to prepare an aqueous dispersion system, and then adding titanium carbide to the former aqueous dispersion system for solid-liquid mixing; thereafter, stirring at a rate of 650 rpm at 60° C. for 2 h to obtain an aqueous dispersion system of the precursor; S300, weighing sodium hydroxide according to a molar ratio of sodium hydroxide to metal elements (Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Ti) of 150:1, and dissolving it in distilled water to prepare an aqueous dispersion system, and then adding it to the aqueous dispersion system of the precursor obtained in S200, stirring at a rate of 650 rpm at 60° C. for 2 h to obtain a gelled precursor; S400, transferring the gelled precursor obtained in S300 to a stainless steel hydrothermal reactor lined with modified polytetrafluoroethylene for gel hydrothermal crystallization, wherein the reaction temperature is 180°C and the reaction time is 24h; S500, after the reaction is completed and cooled to room temperature, the reaction product is taken out from the modified polytetrafluoroethylene liner in S400, centrifugally washed with distilled water for 3 times to obtain the multi-component rare earth oxide material with a perovskite structure, and vacuum dried at 60° C. for 60 hours to be stored in the form of a solid powder; S600, collecting the liquid phase solution separated in step S500, concentrating it by heating and distilling, obtaining a concentrated aqueous dispersion of sodium hydroxide, and using it again in step S300.

[0064] like Figure 6 As shown, the material presents a single perovskite structure, has no impurities, and has high crystallinity.

[0065] like Figure 7 As shown, the material exhibits a uniform cubic morphology. Example 5

[0066] This embodiment provides a method for preparing a cubic morphology material with a ratio of sodium hydroxide to metal element of 10:1, which specifically comprises the following steps: S100, the raw materials are yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, erbium acetate hydrate and titanium sulfate, according to Na 0.5 Y 0.2 Yb 0.2 Er 0.1 TiO 3 The selected raw materials are weighed in the stoichiometric ratio of Y, Yb, Er and Ti elements, i.e., yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, erbium acetate hydrate and titanium sulfate are weighed in the ratio of 0.2:0.2:0.1:1; S200, adding weighed yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, and erbium acetate hydrate into ultrapure water to prepare an aqueous dispersion system, and then adding titanium sulfate into the aqueous dispersion system to perform solid-liquid mixing; thereafter, stirring at 80° C. at a rate of 700 rpm for 6 h to obtain an aqueous dispersion system of the precursor; S300, weighing sodium hydroxide according to the molar ratio of sodium hydroxide to metal elements (Y, Yb, Er and Ti) of 10:1, and dissolving it in ultrapure water to prepare a water dispersion system, and then adding it to the water dispersion system of the precursor obtained in S200, stirring at 80°C at a rate of 700 rpm for 6 hours to obtain a gel precursor; S400, transferring the gel precursor obtained in S300 to a stainless steel hydrothermal reactor lined with para-polyphenol for gel hydrothermal crystallization, wherein the reaction temperature is 280° C. and the reaction time is 24 h; S500, after the reaction is completed and cooled to room temperature, the reaction product is taken out from the para-polyphenol lining in S400, and the multi-component rare earth oxide material with perovskite structure is obtained after centrifugal washing with ultrapure water for 3 times, and the multi-component rare earth oxide material is vacuum dried at 60° C. for 4 hours and stored in the form of solid powder; S600, collecting the liquid phase solution separated in step S500, concentrating it by heating and distilling, obtaining a concentrated aqueous dispersion of sodium hydroxide, and using it again in step S300.

[0067] The Na prepared in this example 0.5 Y 0.2 Yb 0.2 Er 0.1 TiO 3 The up-conversion luminescence test showed bright green and red luminescence peaks under 980nm excitation.

[0068] like Figure 8As shown, the material morphology is uniform and displays a cubic morphology. Example 6

[0069] This embodiment provides a method for preparing a truncated cube morphology material with a ratio of sodium hydroxide to metal element of 50:1, which specifically comprises the following steps: S100, the raw materials are yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, erbium acetate hydrate and titanium sulfate, according to Na 0.5 Y 0.2 Yb 0.2 Er 0.1 TiO 3 The selected raw materials are weighed in the stoichiometric ratio of Y, Yb, Er and Ti elements, i.e., yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, erbium acetate hydrate and titanium sulfate are weighed in the ratio of 0.2:0.2:0.1:1; S200, adding weighed yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, and erbium acetate hydrate into ultrapure water to prepare an aqueous dispersion system, and then adding titanium sulfate into the aqueous dispersion system to perform solid-liquid mixing; thereafter, stirring at 80° C. at a rate of 700 rpm for 6 h to obtain an aqueous dispersion system of the precursor; S300, weighing sodium hydroxide according to a molar ratio of sodium hydroxide to metal elements (Y, Yb, Er and Ti) of 50:1, and dissolving it in ultrapure water to prepare a water dispersion system, and then adding it to the water dispersion system of the precursor obtained in S200, stirring at 80° C. at a rate of 700 rpm for 6 hours to obtain a gel precursor; S400, transferring the gel precursor obtained in S300 to a stainless steel hydrothermal reactor lined with para-polyphenol for gel hydrothermal crystallization, wherein the reaction temperature is 280° C. and the reaction time is 24 h; S500, after the reaction is completed and cooled to room temperature, the reaction product is taken out from the para-polyphenol lining in S400, and the multi-component rare earth oxide material with perovskite structure is obtained after centrifugal washing with ultrapure water for 3 times, and the multi-component rare earth oxide material is vacuum dried at 60° C. for 4 hours and stored in the form of solid powder; S600, collecting the liquid phase solution separated in step S500, concentrating it by heating and distilling, obtaining a concentrated aqueous dispersion of sodium hydroxide, and using it again in step S300.

[0070] The Na prepared in this example 0.5 Y 0.2 Yb 0.2 Er 0.1 TiO 3 The up-conversion luminescence test showed bright green and red luminescence peaks under 980nm excitation.

[0071] like Fig. 9 As shown, the material morphology is uniform, showing a truncated cube morphology. Example 7

[0072] This embodiment provides a method for preparing a truncated cube morphology material with a ratio of sodium hydroxide to metal element of 100:1, which specifically comprises the following steps: S100, the raw materials are yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, erbium acetate hydrate and titanium sulfate, according to Na 0.5 Y 0.2 Yb 0.2 Er 0.1 TiO 3 The selected raw materials are weighed in the stoichiometric ratio of Y, Yb, Er and Ti elements, i.e., yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, erbium acetate hydrate and titanium sulfate are weighed in the ratio of 0.2:0.2:0.1:1; S200, adding weighed yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, and erbium acetate hydrate into ultrapure water to prepare an aqueous dispersion system, and then adding titanium sulfate into the aqueous dispersion system to perform solid-liquid mixing; thereafter, stirring at 80° C. at a rate of 700 rpm for 6 h to obtain an aqueous dispersion system of the precursor; S300, weighing sodium hydroxide according to a molar ratio of sodium hydroxide to metal elements (Y, Yb, Er and Ti) of 100:1, and dissolving it in ultrapure water to prepare a water dispersion system, and then adding it to the water dispersion system of the precursor obtained in S200, stirring at 80°C at a rate of 700 rpm for 6 hours to obtain a gel precursor; S400, transferring the gel precursor obtained in S300 to a stainless steel hydrothermal reactor lined with para-polyphenol for gel hydrothermal crystallization, wherein the reaction temperature is 280° C. and the reaction time is 24 h; S500, after the reaction is completed and cooled to room temperature, the reaction product is taken out from the para-polyphenol lining in S400, and the multi-component rare earth oxide material with perovskite structure is obtained after centrifugal washing with ultrapure water for 3 times, and the multi-component rare earth oxide material is vacuum dried at 60° C. for 4 hours and stored in the form of solid powder; S600, collecting the liquid phase solution separated in step S500, concentrating it by heating and distilling, obtaining a concentrated aqueous dispersion of sodium hydroxide, and using it again in step S300.

[0073] The Na prepared in this example 0.5 Y 0.2 Yb 0.2 Er 0.1 TiO 3The up-conversion luminescence test showed bright green and red luminescence peaks under 980nm excitation.

[0074] like Fig.10 As shown, the material morphology is uniform, showing a truncated cube morphology. Example 8

[0075] This embodiment provides a method for preparing a truncated cube morphology material with a ratio of sodium hydroxide to metal element of 200:1, which specifically comprises the following steps: S100, the raw materials are yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, erbium acetate hydrate and titanium sulfate, according to Na 0.5 Y 0.2 Yb 0.2 Er 0.1 TiO 3 The selected raw materials are weighed in the stoichiometric ratio of Y, Yb, Er and Ti elements, i.e., yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, erbium acetate hydrate and titanium sulfate are weighed in the ratio of 0.2:0.2:0.1:1; S200, adding weighed yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, and erbium acetate hydrate into ultrapure water to prepare an aqueous dispersion system, and then adding titanium sulfate into the aqueous dispersion system to perform solid-liquid mixing; thereafter, stirring at 80° C. at a rate of 700 rpm for 6 h to obtain an aqueous dispersion system of the precursor; S300, weighing sodium hydroxide according to a molar ratio of sodium hydroxide to metal elements (Y, Yb, Er and Ti) of 200:1, and dissolving it in ultrapure water to prepare an aqueous dispersion system, and then adding it to the aqueous dispersion system of the precursor obtained in S200, stirring at 80°C at a rate of 700 rpm for 6 hours to obtain a gelled precursor; S400, transferring the gel precursor obtained in S300 to a stainless steel hydrothermal reactor lined with para-polyphenol for gel hydrothermal crystallization, wherein the reaction temperature is 280° C. and the reaction time is 24 h; S500, after the reaction is completed and cooled to room temperature, the reaction product is taken out from the para-polyphenol lining in S400, and the multi-component rare earth oxide material with perovskite structure is obtained after centrifugal washing with ultrapure water for 3 times, and the multi-component rare earth oxide material is vacuum dried at 60° C. for 4 hours and stored in the form of solid powder; S600, collecting the liquid phase solution separated in step S500, concentrating it by heating and distilling, obtaining a concentrated aqueous dispersion of sodium hydroxide, and using it again in step S300.

[0076] The Na prepared in this example 0.5 Y 0.2 Yb 0.2 Er0.1 TiO 3 The up-conversion luminescence test showed bright green and red luminescence peaks under 980nm excitation.

[0077] like Fig.11 As shown, the material morphology is uniform, showing a truncated cube morphology. Example 9

[0078] This embodiment provides a method for preparing a truncated cube-shaped material with a size of 360 nm by hydrothermal crystallization of a gel for 0.1 h, which specifically comprises the following steps: S100, the raw materials are yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, holmium nitrate hexahydrate and titanium dioxide, according to Na 0.5 Y 0.2 Yb 0.2 Ho 0.1 TiO 3 The selected raw materials are weighed in the stoichiometric ratio of Y, Yb, Ho and Ti elements, that is, yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, holmium nitrate hexahydrate and titanium dioxide are weighed in the ratio of 0.2:0.2:0.1:1; S200, adding weighed yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, and holmium nitrate hexahydrate into ultrapure water to prepare an aqueous dispersion system, and then adding titanium dioxide into the aqueous dispersion system to perform solid-liquid mixing; thereafter, stirring at a rate of 450 rpm and a stirring time of 8 h at 50° C. to obtain an aqueous dispersion system of the precursor; S300, weighing sodium hydroxide according to the molar ratio of sodium hydroxide to metal elements (Y, Yb, Ho and Ti) of 50:1, and dissolving it in ultrapure water to prepare a water dispersion system, and then adding it to the water dispersion system of the precursor obtained in S200, stirring at a rate of 450 rpm at 50°C for 8 hours to obtain a gel precursor; S400, transferring the gel precursor obtained in S300 to a stainless steel hydrothermal reactor lined with para-polyphenol for gel hydrothermal crystallization, wherein the reaction temperature is 260° C. and the reaction time is 0.1 h; S500, after the reaction is completed and cooled to room temperature, the reaction product is taken out from the para-polyphenol lining in S400, and the multi-component rare earth oxide material with perovskite structure is obtained after centrifugal washing with ultrapure water for 3 times, and the multi-component rare earth oxide material is dispersed in ultrapure water for storage; S600, collecting the liquid phase solution separated in step S500, concentrating it by heating and distilling, obtaining a concentrated aqueous dispersion of sodium hydroxide, and using it again in step S300.

[0079] The Na prepared in this example 0.5 Y0.2 Yb 0.2 Ho 0.1 TiO 3 The up-conversion luminescence test showed bright green and red luminescence peaks under 980nm excitation.

[0080] like Fig.12 As shown, the material has a uniform morphology, a size of 360 nm, and displays a truncated cube morphology. Example 10

[0081] This embodiment provides a method for preparing a truncated cube-shaped material with a size of 680 nm by hydrothermal crystallization of a gel for 2 hours, which specifically comprises the following steps: S100, the raw materials are yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, holmium nitrate hexahydrate and titanium dioxide, according to Na 0.5 Y 0.2 Yb 0.2 Ho 0.1 TiO 3 The selected raw materials are weighed in the stoichiometric ratio of Y, Yb, Ho and Ti elements, that is, yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, holmium nitrate hexahydrate and titanium dioxide are weighed in the ratio of 0.2:0.2:0.1:1; S200, adding weighed yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, and holmium nitrate hexahydrate into ultrapure water to prepare an aqueous dispersion system, and then adding titanium dioxide into the aqueous dispersion system to perform solid-liquid mixing; thereafter, stirring at a rate of 450 rpm and a stirring time of 8 h at 50° C. to obtain an aqueous dispersion system of the precursor; S300, weighing sodium hydroxide according to the molar ratio of sodium hydroxide to metal elements (Y, Yb, Ho and Ti) of 50:1, and dissolving it in ultrapure water to prepare a water dispersion system, and then adding it to the water dispersion system of the precursor obtained in S200, stirring at a rate of 450 rpm at 50°C for 8 hours to obtain a gel precursor; S400, transferring the gelled precursor obtained in S300 to a stainless steel hydrothermal reactor lined with para-polyphenol for gel hydrothermal crystallization, wherein the reaction temperature is 260° C. and the reaction time is 2 h; S500, after the reaction is completed and cooled to room temperature, the reaction product is taken out from the para-polyphenol lining in S400, and the multi-component rare earth oxide material with perovskite structure is obtained after centrifugal washing with ultrapure water for 3 times, and the multi-component rare earth oxide material is dispersed in ultrapure water for storage; S600, collecting the liquid phase solution separated in step S500, concentrating it by heating and distilling, obtaining a concentrated aqueous dispersion of sodium hydroxide, and using it again in step S300.

[0082] The Na prepared in this example 0.5 Y 0.2 Yb 0.2 Ho 0.1 TiO 3 The up-conversion luminescence test showed bright green and red luminescence peaks under 980nm excitation.

[0083] like Fig.13 As shown, the material has a uniform morphology, a size of 680 nm, and displays a truncated cube morphology. Embodiment 11

[0084] This embodiment provides a method for preparing a truncated cube-shaped material with a size of 1050 nm by hydrothermal crystallization of a gel for 4 hours, which specifically comprises the following steps: S100, the raw materials are yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, holmium nitrate hexahydrate and titanium dioxide, according to Na 0.5 Y 0.2 Yb 0.2 Ho 0.1 TiO 3 The selected raw materials are weighed in the stoichiometric ratio of Y, Yb, Ho and Ti elements, that is, yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, holmium nitrate hexahydrate and titanium dioxide are weighed in the ratio of 0.2:0.2:0.1:1; S200, adding weighed yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, and holmium nitrate hexahydrate into ultrapure water to prepare an aqueous dispersion system, and then adding titanium dioxide into the aqueous dispersion system to perform solid-liquid mixing; thereafter, stirring at a rate of 450 rpm and a stirring time of 8 h at 50° C. to obtain an aqueous dispersion system of the precursor; S300, weighing sodium hydroxide according to the molar ratio of sodium hydroxide to metal elements (Y, Yb, Ho and Ti) of 50:1, and dissolving it in ultrapure water to prepare a water dispersion system, and then adding it to the water dispersion system of the precursor obtained in S200, stirring at a rate of 450 rpm at 50°C for 8 hours to obtain a gel precursor; S400, transferring the gel precursor obtained in S300 to a stainless steel hydrothermal reactor lined with para-polyphenol for gel hydrothermal crystallization, wherein the reaction temperature is 260° C. and the reaction time is 4 h; S500, after the reaction is completed and cooled to room temperature, the reaction product is taken out from the para-polyphenol lining in S400, and the multi-component rare earth oxide material with perovskite structure is obtained after centrifugal washing with ultrapure water for 3 times, and the multi-component rare earth oxide material is dispersed in ultrapure water for storage; S600, collecting the liquid phase solution separated in step S500, concentrating it by heating and distilling, obtaining a concentrated aqueous dispersion of sodium hydroxide, and using it again in step S300.

[0085] The Na prepared in this example 0.5 Y 0.2 Yb 0.2 Ho 0.1 TiO 3 The up-conversion luminescence test showed bright green and red luminescence peaks under 980nm excitation.

[0086] like Fig.14 As shown, the material has a uniform morphology, a size of 1050 nm, and displays a truncated cube morphology. Example 12

[0087] This embodiment provides a method for preparing a truncated cube-shaped material with a size of 5010 nm by hydrothermal crystallization of a gel for 24 hours, which specifically comprises the following steps: S100, the raw materials are yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, holmium nitrate hexahydrate and titanium dioxide, according to Na 0.5 Y 0.2 Yb 0.2 Ho 0.1 TiO 3 The selected raw materials are weighed in the stoichiometric ratio of Y, Yb, Ho and Ti elements, that is, yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, holmium nitrate hexahydrate and titanium dioxide are weighed in the ratio of 0.2:0.2:0.1:1; S200, adding weighed yttrium chloride hexahydrate, ytterbium nitrate pentahydrate, and holmium nitrate hexahydrate into ultrapure water to prepare an aqueous dispersion system, and then adding titanium dioxide into the aqueous dispersion system to perform solid-liquid mixing; thereafter, stirring at a rate of 450 rpm and a stirring time of 8 h at 50° C. to obtain an aqueous dispersion system of the precursor; S300, weighing sodium hydroxide according to the molar ratio of sodium hydroxide to metal elements (Y, Yb, Ho and Ti) of 50:1, and dissolving it in ultrapure water to prepare a water dispersion system, and then adding it to the water dispersion system of the precursor obtained in S200, stirring at a rate of 450 rpm at 50°C for 8 hours to obtain a gel precursor; S400, transferring the gel precursor obtained in S300 to a stainless steel hydrothermal reactor lined with para-polyphenol for gel hydrothermal crystallization, wherein the reaction temperature is 260° C. and the reaction time is 24 h; S500, after the reaction is completed and cooled to room temperature, the reaction product is taken out from the para-polyphenol lining in S400, and the multi-component rare earth oxide material with perovskite structure is obtained after centrifugal washing with ultrapure water for 3 times, and the multi-component rare earth oxide material is dispersed in ultrapure water for storage; S600, collecting the liquid phase solution separated in step S500, concentrating it by heating and distilling, obtaining a concentrated aqueous dispersion of sodium hydroxide, and using it again in step S300.

[0088] The Na prepared in this example 0.5 Y 0.2 Yb 0.2 Ho 0.1 TiO 3 The up-conversion luminescence test showed bright green and red luminescence peaks under 980nm excitation.

[0089] like Fig.15 As shown, the material has a uniform morphology, a size of 5010 nm, and displays a truncated cube morphology.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-component rare earth oxide material with a perovskite structure, characterized in that: The chemical formula of the multi-component rare earth oxide material is: Na 0.5 RE 0.5 TiO3 Among them, RE is one or more of the rare earth elements Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu.

2. The multi-component rare earth oxide material with a perovskite structure according to claim 1, characterized in that: In the chemical formula, RE 0.5 for: Sc a Y b There c This d Pr e Nd f Pm g Sm h I i Gd j Tb k Dy l Ho m Er n Tm o Yb p Read q Among them, a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q are molar coefficients; Among them, 0≤a≤0.5, 0≤b≤0.5, 0≤c≤0.5, 0≤d≤0.5, 0≤e≤0.5, 0≤f≤0.5, 0≤g≤0.5, 0≤h≤0.5, 0≤i≤0.5, 0≤j≤0.5, 0≤k≤0.5, 0≤l≤0.5, 0≤m≤0.5, 0≤n≤0.5, 0≤o≤0.5, 0≤p≤0.5, 0≤q≤0.5, and a+b+c+d+e+f+g+h+i+j+k+l+m+n+o+p+q=0.

5.

3. A method for preparing a multi-component rare earth oxide material with a perovskite structure, characterized in that: The method for preparing the multi-component rare earth oxide material with a perovskite structure as claimed in any one of claims 1 to 2 comprises the following steps: S100, weighing a rare earth compound and a titanium compound; S200, mixing a rare earth compound and a titanium compound to obtain a mixture; adding the mixture to water, stirring at a first preset temperature and a first preset stirring speed for a first preset time to obtain a water system of a precursor; S300, weighing sodium hydroxide and adding it to the water system of the precursor, stirring it at a second preset temperature and a second preset stirring speed for a second preset time to gel it; S400, adding the gelled precursor into a stainless steel hydrothermal reactor to perform a gel hydrothermal crystallization reaction to obtain a reaction product; S500, centrifugally washing the reaction product with ultrapure water to obtain a multi-component rare earth oxide material with a perovskite structure.

4. The method for preparing a multi-component rare earth oxide material with a perovskite structure according to claim 3, characterized in that: The rare earth compound includes rare earth oxide, rare earth halide, rare earth acetylacetonate, rare earth hydroxide, rare earth phosphate, rare earth carbonate, rare earth chlorate, rare earth sulfate, rare earth organic complex, rare earth nitrate or rare earth acetate.

5. The method for preparing a multi-component rare earth oxide material with a perovskite structure according to claim 3, characterized in that: The titanium compound includes titanium oxide, titanium halide, titanium nitride, titanium carbide, titanium boride, titanium silicide, titanium hydroxide, titanium sulfate or an organic titanium compound.

6. The method for preparing a multi-component rare earth oxide material with a perovskite structure according to claim 3, characterized in that: In the step S200, or, a water system of a rare earth compound and a water system of a titanium compound are prepared; the water system of the rare earth compound and the water system of the titanium compound are mixed to obtain a mixed solution, and the mixed solution is stirred at a first preset temperature and a first set stirring speed for a first set time to obtain a water system of a precursor; Or, preparing a water system of rare earth compounds; adding a titanium compound to the water system of rare earth compounds, mixing to obtain a mixed solution, stirring the mixed solution at a first preset temperature and a first preset stirring speed for a first preset time to obtain a water system of a precursor; or, preparing an aqueous system for a titanium compound; A rare earth compound is added to a water system of a titanium compound, and mixed to obtain a mixed solution. The mixed solution is stirred at a first preset temperature and a first preset stirring speed for a first preset time to obtain a water system of a precursor.

7. The method for preparing a multi-component rare earth oxide material with a perovskite structure according to claim 6, characterized in that: In the step S200, the first preset temperature is 5°C to 95°C, the first set stirring speed is 50 rpm to 1000 rpm, and the first set time is 1h to 48h.

8. The method for preparing a multi-component rare earth oxide material with a perovskite structure according to claim 3, characterized in that: In the step S300, the molar ratio of sodium hydroxide to the metal element in the raw material is (5-300):1; The second preset temperature is 5° C. to 95° C., the second set stirring speed is 50 rpm to 1000 rpm, and the second set time is 1 h to 48 h.

9. The method for preparing a multi-component rare earth oxide material with a perovskite structure according to claim 3, characterized in that: In the step S400, the stainless steel hydrothermal reactor is provided with an inner lining, and the material of the inner lining is modified polytetrafluoroethylene or para-polyphenol; The reaction temperature in the stainless steel hydrothermal reactor is 100° C. to 300° C., and the reaction time is 0.1 h to 100 h.

10. The method for preparing a multi-component rare earth oxide material with a perovskite structure according to claim 3, characterized in that: Also includes: S600, collecting the liquid phase solution separated by centrifugal washing in step S500, heating and distilling the liquid phase solution to concentrate it, and obtaining a concentrated sodium hydroxide water system.

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