669 results about "Ion doping" patented technology

The invention relates to a preparation method and application of a manganese ion doped modified ferric sodium pyrophosphate positive electrode material, and belongs to the technical field of sodium ion battery positive electrodes. The preparation method comprises the following steps: adding a sodium source, a phosphorus source and a carbon source into ethanol, uniformly mixing to form a mixed solution, sequentially adding an iron source and a manganese source into the mixed solution, uniformly mixing to form slurry, and drying the slurry to obtain precursor powder; calcining in a protective atmosphere to obtain a manganese-doped carbon-coated ferric pyrophosphate sodium material; the calcining conditions are as follows: heating to the temperature of 300-350 DEG C at the heating rate of 2-3 DEG C / min, carrying out first-stage constant-temperature calcination for 2-3 hours, heating to the temperature of 500-550 DEG C at the heating rate of 5-8 DEG C / min, and carrying out second-stage constant-temperature calcination for 10-12 hours. By doping the manganese ions, the electronic conductivity and the ion diffusivity of the ferric sodium phosphate pyrophosphate composite material are improved, so that the discharge capacity of the ferric sodium phosphate pyrophosphate composite material at high rate is improved, and the battery has relatively high cycle stability.

The invention relates to a preparation method of a nickel ion doped modified ferric sodium pyrophosphate positive electrode material, and belongs to the technical field of sodium ion battery positive electrode materials. The nickel ion doped modified ferric sodium pyrophosphate positive electrode material is prepared by adopting an integrated process system of liquid phase uniform mixing, spray granulation and precise segmented calcination. According to the process system, atomic-scale uniform doping of nickel ions and a specific microstructure of a precursor are realized through spray drying, and a plurality of inherent key technical problems of low electronic conductivity, low ion diffusion rate, impurity phase generation and the like of an NFPP material are solved together through a synergistic effect with a subsequent calcining process; furthermore, the discharge capacity of the ferric sodium phosphate pyrophosphate composite material at high rate is improved, so that the battery has relatively high cycling stability.

The invention relates to the technical field of lithium ion batteries, in particular to a modified cobalt-free lithium-rich manganese-based positive electrode material doped with anions and cations and a preparation method of the modified cobalt-free lithium-rich manganese-based positive electrode material. According to the method, a modified lithium-rich manganese-based precursor is prepared from a metal salt solution, a precipitator, a fluorine source and a complexing agent, and the anion-cation co-doped cobalt-free lithium-rich manganese-based positive electrode material is prepared from the modified lithium-rich manganese-based precursor and a lithium source. The metal salt solution contains manganese salt, nickel salt and aluminum salt. According to the method, by doping Al and F, the voltage attenuation is effectively reduced, the long cycle performance of the material is improved, the rate capability of the material is improved, and in addition, mixed arrangement of lithium and nickel cations is effectively inhibited, so that the cycle stability is improved.

The invention discloses a sodium ferric pyrophosphate material with a sodium storage dominant crystal face regulated and controlled by cation doping as well as a preparation method and application of the sodium ferric pyrophosphate material. The chemical formula of the prepared sodium ferric pyrophosphate material with the regulated and controlled crystal structure is Na < 4 > Fe < 2.97 > M < 0.03 > (PO4) < 2 > P < 2 > O < 7 >. Wherein M = Sr, or Sr and a second doping element, and the second doping element is selected from one of Cd, Bi, Mo, Ni and Al. The material is prepared by adopting a sol-gel method, an iron source, a chelating agent, a sodium source, a phosphorus source and doping elements are dissolved in deionized water, and stirring is performed until a gel state is formed; and drying and calcining twice to obtain a final product. The sodium ferric pyrophosphate electrode material prepared by the invention has more sodium storage dominant crystal faces, shows good electrochemical performance, has the advantages of simple preparation process, easily available raw materials and low cost, has remarkable industrial application value, and is easy for large-scale production.

The invention discloses an ion doping method based on first principle calculation and application thereof. Relates to the technical field of building materials. The method comprises the following steps: firstly, constructing a cement clinker mineral phase crystal structure model, and performing structural relaxation on the model to obtain a model crystal structure with a determined lattice constant; secondly, analyzing and optimizing microstructure changes and corresponding energy state changes of various mineral phases in the ion doping process by utilizing a quantum mechanical simulation means, representing the solid solubility of doped ions and mineral phase structures through the defect formation energy of ion doping, forming energy being negative reaction process being spontaneous process, the closer to 0, the better the solid solubility, and the more to 0, the better the solid solubility; therefore, how to enhance the hydration reaction activity and improve the strength by ion doping is disclosed. The mechanical property, durability and corrosion resistance of the cement are improved by accurately regulating and controlling the characteristics of the multi-mineral-phase structure.

The invention relates to the technical field of integrated circuits, in particular to a simulation test method and device for a semiconductor device. The method comprises the following steps: acquiring simulation parameter information of a first target device, wherein the simulation parameter information of the first target device comprises a first nuclear blocking correction parameter value; performing a simulation test based on the simulation parameter information of the first target device, and obtaining simulation transverse ion doping concentration distribution and a simulation threshold voltage value of the preset region; updating simulation parameter information of the first target device; performing a simulation test based on the updated simulation parameter information of the first target device, and obtaining another simulation transverse ion doping concentration distribution and another simulation threshold voltage value of the preset area; and taking the simulation threshold voltage value with the highest matching degree with the actual threshold voltage value of the first target device in all the simulation threshold voltage values as a target threshold voltage value, and determining the simulation transverse ion doping concentration distribution corresponding to the target threshold voltage value as target transverse ion doping concentration distribution.

The invention discloses an oxide-coated ion-doped sodium ferric sulfate positive electrode material as well as a preparation method and application thereof. The positive electrode material is formed by compounding a sodium ferric sulfate bulk phase material doped with various valence metal cations and anions and coated with carbon similar to a positive temperature coefficient thermosensitive metal oxide. Wherein the metal cations with various valence states are doped on Na or Na / Fe ion sites of the sodium ferric sulfate, the doped anions occupy part of three-dimensional S-O tetrahedron positions, the inorganic carbon in the carbon compound is uniformly distributed in the sodium ferric sulfate bulk phase material, and the organic carbon is uniformly distributed outside the sodium ferric sulfate bulk phase material. The positive electrode plate assembled battery prepared from the positive electrode material has the advantages of high reversible charge-discharge capacity, excellent cycle performance and rate capability and high electron and ion migration rate in a low-temperature environment. The method is low in raw material cost, simple in synthesis method, short in production period and suitable for large-scale continuous production.

The invention relates to a rare earth ion doped enhanced ionizing radiation luminescence low-dimensional halide scintillator and a preparation method and application thereof, and belongs to the technical field of scintillating materials. Aiming at the problems that the radiuses of RE ions and low-dimensional halide A5B3 (ClxBryI1-x-y) 8 materials are poor in lattice adaptation degree, the melting points of the RE ions and the low-dimensional halide A5B3 (ClxBryI1-x-y) 8 materials are difficult to consider in the doping process, concentration segregation is easy to occur and large-size crystals are difficult to grow, the solid-solution ratio of halogen anions and the doping concentration of the rare earth ions are regulated and controlled, namely 0.25 < = x < = 0.875, 0 < = y < = 1, x + y < = 1 and 0 < m < 10 are controlled; meanwhile, a rotation descent method is adopted for crystal growth, the scintillator single crystal material A5B3 (ClxBryI1-x-y) 8: m at% RE with the advantages of high ionizing radiation luminous efficiency, high light output and the like is finally obtained, and the material can be applied to the fields of X-ray imaging, gamma-ray detection, particle detection and the like.

The invention belongs to the technical field of positive electrode materials for lithium ion secondary batteries, and particularly discloses a high-valence cation doped high-nickel lithium-rich manganese-based positive electrode material and a preparation method thereof, the chemical formula of the high-valence cation doped high-nickel lithium-rich manganese-based positive electrode material is Li < 1.13 > (Mn < 0.522 > Ni < 0.261 > Co < 0.087 >) < 1-x > Nb < x > O < 2 >, and x is greater than or equal to 0 and less than or equal to 0.005. According to the high-valence cation doped high-nickel lithium-rich manganese-based positive electrode material and the preparation method thereof, by doping the Nb doped high-nickel lithium-rich manganese-based positive electrode material, the voltage attenuation is effectively reduced, the long cycle performance of the material is improved, the rate capability of the material is improved, in addition, a firm Nb-O bond can effectively stabilize an oxygen lattice frame, and the high-valence cation doped high-nickel lithium-rich manganese-based positive electrode material is prepared. Phase change is slowed down, so that irreversible release of oxygen is inhibited, and the structural stability of the material is improved.

The invention belongs to the technical field of sodium ion battery positive electrode materials, and discloses a preparation method and application of an iron ion doped sodium vanadium phosphate positive electrode material. Modification is carried out by doping iron ions in vanadium sites and taking citric acid as a carbon source for coating, iron nitrate nonahydrate serves as an iron source to participate in the modification process, meanwhile, citric acid is used for carrying out carbon coating on the material, and the citric acid and the doped iron ions synergistically increase the ionic conductivity, so that the problem that the sodium vanadium phosphate material is poor in conductivity is solved. Besides, in the sintering treatment process, the Na3V1.8 Fe0.2 (PO4) 3 / C positive electrode material obtained by doping 0.2 molar weight of iron ions and coating citric acid is always kept in the atmosphere of argon-hydrogen mixed gas, after circulation at the current density of 0.1 C to 20 C, the capacity recovery rate can reach up to 96.1%, and the capacity can still be kept to be 74.1% of the initial capacity at the high rate of 20 C; after 500 cycles under 1C current density, the capacity retention rate is 89.8%, while the capacity retention rate is only 72% after 500 cycles of pure NVP, the rate capability and cycling stability of the material are both improved, and the electrochemical performance of the material is effectively ensured.

The invention relates to an egg yolk shell structure ion-doped sodium ferric sulfate positive electrode material, a preparation method and an application thereof, and the material is an egg yolk shell sphere structure carbon composite sodium ferric sulfate positive electrode material formed by doping cations A and B at Na or Na / Fe ion sites of sodium ferric sulfate and enabling anions to occupy part of S-O tetrahedral positions to change the arrangement mode of Fe-O octahedrons of the sodium ferric sulfate, the shell and the inner core of the egg yolk shell sphere are uniform in material, a gap exists between the shell and the inner core, and carbon is uniformly distributed and coated inside and outside the material. The invention also discloses a preparation method and application of the egg yolk shell structure ion-doped sodium ferric sulfate positive electrode material. The material is large in specific surface area, the reversible charge-discharge capacity of an assembled battery is high, and the cycle performance and the high-rate performance are good. The method is low in raw material cost, simple, short in production period and suitable for large-scale continuous production.

The invention relates to the technical field of sodium-ion batteries, and discloses a preparation method and application of a cation-doped polyanion type sodium-ion battery positive electrode material, the chemical formula of the positive electrode material is Na < 4 + x > Fe < 3-y > TMy (PO4) 2P2O7, TM is one or more of transition metals with the same valence state as Fe < 2 + > in Mn, Co, Ni, Cu and Zn, x is more than 0 and less than or equal to 0.5, y is more than 0 and less than or equal to 0.4; precursor wet gel is obtained through a sol-gel process, and is sintered after being dried. The transition metal cations with the same valence state and different electronic structures are introduced into the Fe site of the material, and the electron transmission rate is effectively increased and the ion diffusion kinetics is enhanced by adjusting the Fe coordination environment; when the Na < 4 + x > Fe < 3-y > TMy (PO4) 2P2O7 positive electrode material prepared by the invention is applied to a sodium ion battery, high specific discharge capacity, excellent rate capability and cycle performance are shown.

The invention belongs to the technical field of luminescent materials, and discloses an up-conversion nano material as well as a preparation method and application thereof. The up-conversion nano material comprises a core, the element composition of the core is NaErF4: Nd, Yb and Ce, and the molar weight of Nd accounts for 2%-15% of the total molar weight of rare earth elements of the core; the core is coated with a middle shell, the element composition of the middle shell is NaYF4: Yb, and the molar weight of Yb accounts for 20%-100% of the total molar weight of rare earth elements of the middle shell; the outer part of the middle shell is coated with a passivation shell, and the element composition of the passivation shell is NaYF4. According to the up-conversion nano material, through fine ion doping and a unique energy transfer mechanism, efficient up-conversion blue and ultraviolet light emission of Er < 3 + > can be achieved; the preparation method of the up-conversion nano material is simple in process, easy to operate, low in cost, short in period and suitable for mass production.

The invention discloses a NiZnCu ferrite composite metasurface with a P wave band broadband and a low RCS (Radar Cross Section) based on 1-bit coding. Firstly, the impedance matching condition of the ferrite is improved through Mn < 2 + > ion doping, so that when the thickness of the NiZnCu ferrite is 2 mm, effective wave absorption with the reflection loss smaller than-10 dB is achieved within the range of 0.25 GHz to 1.0 GHz. Furthermore, NiZnCu ferrite is combined with a sandwich structure (square metal sheet / FR4 / metal back plate, 6 mm) to construct a 1-bit coding metasurface structure unit, optimal array arrangement is obtained by adopting a genetic algorithm, and directional reflection is reduced to the greatest extent. And finally, full-wave simulation software is used for verification, and the result shows that the NiZnCu ferrite composite coding metasurface can further reduce the RCS by using the diffuse reflection effect on the basis of keeping the ferrite wave absorbing effect, the range of the RCS is 0.50 GHz-0. 75 GHz, and the maximum RCS reduction value can reach 29.4 dB.

The invention provides a chlorine tungsten anion and cation co-doped sodium vanadium phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of energy materials. The positive electrode material is formed by doping V site with W < 4 + > ions and doping (PO4) 3 site with Cl <-> ions, the chemical formula of the positive electrode material is Na < 3-x > V < 2-x > W < x > (PO4) < 3-y > Cl3y / C, x is equal to 0.05, 0.1 and 0.15, and y is equal to 0.09, 0.12 and 0.15; according to the preparation method, ammonium metavanadate, sodium acetate and ammonium dihydrogen phosphate are taken as raw materials, tungsten disulfide and sodium chloride are taken as doping sources, citric acid monohydrate is taken as a chelating agent, and the chlorine tungsten anion and cation co-doped sodium vanadium phosphate electrode material is prepared by a solution gel method, so that the electronic conductivity is improved, and the rate capability and the cycling stability are improved; the preparation method has a good application prospect in sodium ion battery positive electrode materials.

The invention provides a europium ion doped titanate compound as well as a preparation method and application thereof, and relates to the technical field of rare earth luminescent materials. The chemical formula of the titanate compound provided by the invention is K2Ti6O13: xEu < 3 + >, the titanate compound is in a monoclinic system. A proper amount of Eu < 3 + > ions are doped in K2Ti6O13, so that the prepared rare earth fluorescent powder has higher color rendering index and quantum yield, and the luminescent property of a white light LED can be greatly improved; as K2Ti6O13 has good electrochemical performance and relatively high conductivity, the rare earth fluorescent powder provided by the invention can also be used in the fields of illumination, display, photocatalysis and energy storage. And on the other hand, the preparation method provided by the invention is simple in process, mild in condition, convenient for large-scale production and wide in development and application space.

A positive electrode material and a preparation method therefor, and a lithium ion battery. The positive electrode material comprises: a core layer, the core layer comprising Li, Fe, Mn and PO4 - ions, and a doping element A; and a shell layer, wherein the outer surface of the core layer is coated with at least the surface of the shell layer, and the shell layer comprises first carbon particles and second carbon particles. The doping element A comprises at least one element of Al, Mg, Ni, Co, Ti, Ga, Cu, V, Nb, Zr, Ce, In, Zn and Y; the distance between the highest point and the lowest point in a single surface of the positive electrode material does not exceed 1 nm, and the surface roughness of the positive electrode material is 0.8 μm to 1.6 μm. By means of the two-time carbon coating process, the present application greatly reduces manganese dissolution while ensuring high capacity and high compaction of the positive electrode material, thereby ensuring the cyclic discharging efficiency of the positive electrode material.

The invention discloses Mn-doped MgAl-LDH particles for sonodynamic therapy as well as preparation and application. The Mn-doped MgAl-LDH particles are synthesized through a chemical coprecipitation method, Mn ion doping under the protection of N2 and hydrothermal treatment. Wherein trace doping of Mn ions in an LDH structure causes an appropriate energy band structure, so that effective separation of electrons and holes under ultrasonic irradiation is promoted, and generation of ROS is promoted. The Mn-doped MgAl-LDH particles prepared by the preparation method disclosed by the invention show excellent SDT performance, can effectively inhibit the growth of tumors, and show good biocompatibility. Therefore, the innovative design of the invention opens up a potential path for exploring a novel sound-sensitive agent in effective ultrasonic catalytic tumor treatment.

The invention relates to a performance test method of composite structure laser ceramic. The method comprises the steps of physicochemical characteristic test and laser output characteristic test of the composite structure laser ceramic. The physical and chemical characteristic test at least comprises a ceramic density test, a microstructure test, a transmittance test, a stress test and an ion doping test; the laser output characteristic test at least comprises pump light absorption characteristic test, thermal lens focal length test, end surface temperature test and laser output power test. According to the invention, by testing the internal structure characteristics and laser output characteristics of the composite structure laser ceramic, the evaluation of the comprehensive performance of the laser ceramic is realized, and rapid optimization feedback is provided for the design and preparation of the composite structure laser ceramic.

The invention provides a charcoal-coated lithium ion doped sodium ferric silicate composite material as well as a preparation method and application thereof, and belongs to the technical field of sodium ion batteries. The sodium iron silicate is modified in a lithium ion doping manner, so that the specific discharge capacity of the sodium iron silicate can be effectively improved; the lithium ion doped sodium iron silicate material is subjected to carbon coating by adopting the charcoal, so that the cycle performance of the sodium iron silicate can be effectively improved; according to the invention, lithium ion doping and carbon coating methods are adopted at the same time, so that the electrode material has the characteristics of high conductivity, high specific capacity, excellent cycle stability and the like. Results show that the capacity of the charcoal-coated lithium ion-doped sodium ferric silicate composite material prepared by the invention is retained by 82% after 50 cycles at a voltage window of 1.5-4.5 V and a current density of 0.05 C, and the cycle performance is obviously improved.

The invention discloses a Cr < 3 + >-doped gallium germanate broadband near-infrared luminescent material as well as a preparation method and application thereof. The general chemical formula of the luminescent material is Y3ZnGa3-3xCr3xGeO12 (wherein 0 lt; x is smaller than or equal to 0.07), can be effectively excited by a light source of a blue light band or a red light band and emits high-brightness near-infrared light covering the range from far infrared to near infrared (600-1200 nm), and has high light-emitting quantum efficiency (gt; 95%) and excellent thermal stability (gt; 68% at 150 DEG C). The preparation process of the luminescent material is simple and environment-friendly, and the obtained product is stable in physical and chemical properties and pure in phase. In addition, by means of cosolvent doping, Cr < 3 + > ion doping concentration regulation and control and the like, effective regulation and control of luminous properties such as luminous intensity and emission peak position (770nm-830nm) of the luminescent material can be realized. The near-infrared light output power and the photoelectric conversion efficiency of a near-infrared LED light-emitting device formed by combining the light-emitting material and a commercial LED chip are relatively excellent, so that the near-infrared light-emitting device has wide application potential in the fields of night vision imaging, biomedical treatment, information anti-counterfeiting and the like.

The invention provides application of a metal ion doped aminated graphene oxide membrane material in catalyzing CO2 to synthesize cyclic carbonate. The metal ion doped aminated graphene oxide membrane material has an acidic catalytic site and an alkaline catalytic site at the same time, and a two-dimensional interlayer channel of the metal ion doped aminated graphene oxide membrane material also has a confinement effect. In the process of catalyzing a CO2 / epoxy compound cycloaddition reaction, epoxy compound molecules entering a two-dimensional interlayer confinement channel of the metal ion doped aminated graphene oxide membrane material are subjected to efficient ring opening under the combined action of organic amine molecules and metal ions and react with CO2; and finally, realizing CO2 high-efficiency (the reaction time is less than or equal to 5 minutes, and the conversion rate of the epoxy compound is 75-100%) synthesis of the cyclic carbonate under the conditions of room temperature and low pressure (greater than 0.1 MPa and less than or equal to 1 MPa).

This invention discloses a core-shell structured lithium-rich manganese-based cathode material with the general formula Li. 1+a Mn x Co y Ni z O 2‑b‑d (XO c ) b X d It has a core-shell structure, with the core being a disordered polyanion-doped lithium-rich manganese-based material, Li. 1+a Mn x Co y Ni z O 2‑b (XO c ) b The outer shell is made of lithium-rich manganese-based material Li, which is doped with gradient non-metallic ions. 1+ a Mn x Co y Ni z O 2‑d X d This application also provides a method for preparing a core-shell structured lithium-rich manganese-based cathode material. The method employs a combination of rapid Joule heating and surface plasma cleaning to prepare the aforementioned core-shell structured lithium-rich manganese-based cathode material, achieving a bulk disordered structure design with polyanion doping and a core-shell structure with surface gradient non-metallic ion doping. Specifically, the bulk polyanions can immobilize transition metal elements to suppress their migration to the lithium layer, reducing harmful consumption of active sites and stabilizing the crystal structure. Furthermore, the strong bond energy between the surface non-metallic elements and the transition metal elements can suppress transition metal dissolution during cycling, reducing irreversible oxygen oxidation and inhibiting harmful phase transitions.

A carbon-doped sodium iron aluminum titanium sulfate positive electrode material and a preparation method therefor. The carbon-doped sodium iron aluminum titanium sulfate positive electrode material comprises a carbon material and sodium iron aluminum titanium sulfate modified by the carbon material in situ. The general formula of sodium iron aluminum titanium sulfate is NaxFeyAlzTi1-y-z(SO4)m. Compared with single-ion doping, aluminum-titanium double-ion doping and the in-situ modification with the carbon material can produce a synergistic effect, thereby comprehensively improving the performance of the positive electrode material. Compared with the operations of directly ball milling raw materials and then calcining same, the preparation method, in which spray drying is mainly used for preparing a precursor, achieves more uniform distribution of various elements, is beneficial for obtaining a spherical carbon-doped sodium iron aluminum titanium sulfate positive electrode material, and can further improve the performance of the positive electrode material. The preparation method is simple in terms of technological process and easy to industrialize.

The invention provides a semiconductor device and a manufacturing method thereof, and is applied to the technical field of semiconductors. In the invention, the isolating ring structure comprises a first buried layer located in a substrate, the first buried layer comprises a plurality of ion injection layers, and doping types of ions injected into different ion injection layers are different. Ion implantation, such as P-type implantation, with the doping type opposite to that of a buried layer, such as an N-type buried layer, in the isolating ring structure is added around the buried layer, such as the N-type buried layer, so that punch-through, caused by low ion doping of the substrate, between the substrate and a first sub-buried layer, with the doping type opposite to that of the substrate, in the isolating ring structure is cut off; and the breakdown voltage of the high-voltage device is improved.

The invention provides an anion-cation co-doped solid electrolyte, a preparation method thereof, a solid-state battery and electric equipment, and relates to the field of solid electrolytes. The general chemical formula of the anion-cation co-doped solid electrolyte is Li < 2 + > (4-m) x Zr < 1-x > M < x > X < 6-ayAy, 0 < x < = 0.4, 0 < y < = 0.8, m is the valence state of M, and a is the valence state of A; m comprises a metal doping element with the ion radius larger than that of Zr < 4 + > and the valence state lower than that of Zr; x comprises a halogen element; a comprises one or more of O, S, N and P; the ion radius of A is smaller than X; the valence state of M comprises + 2 and / or + 3. The Li2ZrX6 solid electrolyte is subjected to anion and cation co-ion doping, so that the disorder degree of a crystal structure can be increased, a Li < + > transmission channel is widened, and the ionic conductivity is improved.

The invention belongs to the technical field of scintillation materials, and particularly relates to a chromium ion doped near-infrared scintillation crystal and a preparation method and application thereof. The chromium ion-doped near-infrared scintillation crystal has a molecular formula of A3B2-xCrxC3O12, x is greater than or equal to 0.005 and less than or equal to 0.1, and after a chromium ion-doped ultraviolet-visible light inorganic scintillator is adopted, light is emitted at the wavelength of 650-950 nm and has good wavelength matching with a silicon photoelectric detector. Besides, single crystal growth is carried out by adopting a Czochralski method, the crystal growth process is optimized, the ion doping concentration is regulated and controlled, the scintillation performance of the chromium ion doped near-infrared scintillation crystal in the near-infrared band is improved, the requirement of the chromium ion doped near-infrared scintillation crystal in the radiation detection field is further met, and the problem that an existing scintillation crystal is low in transparency is solved.

The invention relates to a cerium ion doped high-entropy fluoride scintillation crystal and a preparation method and application thereof. The preparation method comprises the following steps: taking single crystal particles or powder of LaF3, GdF3, CaF2, SrF2, BaF2 and CeF3 as raw materials, doping Ce ions, uniformly grinding to obtain a matrix material, vacuumizing, carrying out high-temperature sintering, ensuring that the matrix material is completely melted and impurities are removed, slowly cooling, carrying out crystal growth, and cooling to room temperature to obtain the cerium ion doped high-entropy fluoride scintillation crystal. The chemical formula of the high-entropy fluoride scintillation crystal is Ce: M1M2CaSrBaF12, wherein M1 and M2 are any two of Y, Lu, Gd, La, Lu, Sc and Ce. Compared with the prior art, the LaGdCaSrBaF12 high-entropy crystal prepared by the invention has lower phonon energy and smaller 5d energy level cleavage, and can greatly reduce the non-radiative transition probability of the 5d energy level of Ce < 3 + > ions. In addition, the disorderly distributed mixed crystal also regulates and controls the local coordination structure of Ce < 3 + > ions on the scales of atoms, molecules and groups, so that true disorder is achieved.

The invention is applicable to the technical field of photoelectricity, and provides a single-matrix white-light rare earth lead-free perovskite nanocrystal, a preparation method and application, and the single-matrix white-light rare earth lead-free perovskite nanocrystal is Eu < 3 + > ion doped Cs3TbCl6 nanocrystal. The rare earth ion Eu < 3 + > is doped into the Cs3TbCl6 nanocrystal, full-spectrum white light emission of blue light (matrix self-limiting state exciton emission), green light (Tb < 3 + > ion emission) and red light (Eu < 3 + > ion emission) is obtained, excellent thermal stability and environmental stability are achieved, and the nanocrystal material also shows excitation light dependent color adjustable emission (blue light, green light, red light and white light) and has good application prospects. The nanocrystal prepared based on a solution method can be applied to large-area flexible photoelectric devices; the fluorescent conversion layer can be used as a fluorescent conversion layer of a white light emitting diode with a high color rendering index, and can also be applied to anti-counterfeiting and information encryption.

The invention discloses a garnet-structured near-infrared luminescent scintillator, and the preparation method of the scintillator adopts an improved high-temperature solid phase method, and successfully prepares a Cr < 3 + > and Sb < 3 + > doped scandium gallium garnet scintillator through the process steps of batching, grinding, pre-sintering, high-temperature sintering, re-sintering and the like. Specifically, an oxide precursor is accurately mixed according to a stoichiometric ratio, and is sintered under a high-temperature condition (the sintering temperature is 1400-1600 DEG C). In the process, the crystal structure of the material is gradually formed, and meanwhile, doping ions are promoted to be uniformly doped into crystal lattices of the scandium gallium garnet by controlling the sintering time and temperature. In the crystal growth process, the local electronic environment in crystal lattices is optimized through selection and ion doping of A-site ions, and efficient transfer of excited state energy from a matrix to a light-emitting center is promoted. Under the processes of pre-sintering, high-temperature sintering, re-sintering and the like, doped ions in the crystal are distributed more uniformly, the formation of a non-radiative recombination center is reduced, and the luminous efficiency and the stability of the scintillator are improved.