835 results about "Rare earth ions" patented technology

The invention relates to the technical field of plastic packaging preparation, in particular to an anti-aging plastic packaging material and a preparation method thereof.The anti-aging plastic packaging material is prepared from, by mass, 100-140 parts of polylactic acid, 60-80 parts of PBAT, 2-5 parts of a composite anti-aging agent, 1-2 parts of a lubricant, 2-4 parts of a flame retardant and 3-6 parts of a compatilizer; the composite anti-aging agent comprises a modified anti-aging agent obtained by compounding functionalized montmorillonite and modified silicon dioxide, the functionalized montmorillonite is carnosic acid grafted rare earth ion modified montmorillonite, and the modified silicon dioxide is epoxy methyl oleate grafted silicon dioxide. According to the anti-aging plastic packaging material provided by the invention, a plastic material system with multiple protection mechanisms is constructed through the synergistic effect of all the components, and the prepared plastic packaging material not only keeps good biodegradability, but also has excellent ultraviolet light resistance and oxidation resistance.

The invention relates to the technical field of rare earth extraction devices, and discloses rare earth extraction equipment with a microencapsulation auxiliary structure, the rare earth extraction equipment comprises an extraction tower, the extraction tower is sequentially provided with a tower cover, an upper filler part, a middle filler part, a lower filler part and a heavy phase collector from top to bottom, the internal structures of the upper filler part, the middle filler part and the lower filler part are the same, and the heavy phase collector is arranged in the tower cover. Separators are arranged in the middles of the three, a filler area for increasing the contact area of two-phase liquid and prolonging the contact time of the two-phase liquid is arranged below the separators, a perforated plate for bearing the filler area is arranged below the filler area, and an auxiliary area for improving extraction selectivity and efficiency is arranged above the separators. According to the separator disclosed by the invention, the microcapsules and the filler are separately arranged, meanwhile, the microcapsules can continuously move in a fluid in a suspension manner, and the contact between the microcapsules and the liquid phase is dynamic and continuously changed, so that the microcapsules can be in contact with new rare earth ions to be extracted and an extracting agent in time, and a mass transfer interface is continuously updated, so that the mass transfer process is more efficient.

The invention provides a lithium-rich manganese-based material for an all-solid-state battery as well as a preparation method and application thereof, the preparation method comprises the following steps: mixing and drying a lithium-rich manganese-based carbonate precursor, a dopant and a first solvent to obtain a doped lithium-rich manganese-based carbonate precursor, and then sintering and washing to obtain a pretreated precursor; and carrying out ball milling on the pretreated precursor, mixing with a lithium source, and calcining to obtain the submicron single crystal type lithium-rich manganese-based positive electrode material, and mixing the single crystal type lithium-rich manganese-based positive electrode material, a metal source coating agent and a second solvent, then removing the second solvent, and roasting to obtain the lithium-rich manganese-based material for the all-solid-state battery. According to the preparation method disclosed by the invention, through internal doping of rare earth ions, design of a submicron single crystal structure and surface in-situ coating, the migration speed of lithium ions and the stability of the crystal structure can be improved, side reactions of an interface are reduced, and the stability of the interface is improved.

A high-brightness and high-power fiber laser adopts an oscillator structure and comprises a pumping module, a high-reflectivity fiber grating, a gain fiber, a low-reflectivity fiber grating and a cladding light filter, the gain fiber is a rare earth ion doped ZBLAN fiber which takes ZBLAN as a matrix material and is of an all-solid-state anti-resonance structure, and the low-reflectivity fiber grating is a rare earth ion doped ZBLAN fiber which is of an all-solid-state anti-resonance structure. The gain optical fiber comprises a fiber core area, a cladding area, an anti-resonance area and a coating layer, the anti-resonance area is composed of at least one capillary tube set, each capillary tube set comprises a plurality of capillary tubes, the capillary tubes in each capillary tube set are annularly arranged on the periphery of the fiber core area with the fiber core area as the center, and the cladding layer is arranged on the cladding layer. The matrix material in each capillary tube and the matrix material in the cladding region are the same and are ZBLAN, and the matrix material ZBLAN in the fiber core region is doped with dysprosium ions. According to the invention, the rare earth doped all-solid-state anti-resonance optical fiber is adopted as the gain optical fiber, so that high-brightness, high-power and high-efficiency output can be realized.

The invention provides a prospecting exploration method for ion adsorption type rare earth ore, and belongs to the technical field of geological mineral exploration, and the prospecting exploration method comprises the following steps: delineating an ore-forming mother rock area in a working area according to the existing ore points of the ion adsorption type rare earth ore in the working area and in combination with a geochemical exploration abnormal area; delineating a favorable metallogenic landform area in the working area through a GIS space analysis technology; carrying out superposition analysis on the ore-forming mother rock area and the favorable ore-forming landform area, and determining a favorable ore-forming prospective area in the working area through comparison; collecting a sample in the metallogenic distant view area, and verifying whether mineralization abnormity exists in the metallogenic distant view area or not by using a rare earth ion leaching-titration precipitation method; and in an area with mineralization abnormity in the metallogenic distant view area, exploration and evaluation are carried out by arranging Gannan drills in the metallogenic distant view area, the resource quantity of the metallogenic distant view area is calculated, and the prospecting exploration range of the ion adsorption type rare earth ore is determined. According to the method, the metallogenic prospective area can be rapidly delineated in a large range, the working range is reduced, and the efficiency of exploration work is improved.

The invention provides a preparation method of rare earth ion heavily-doped luminescent glass and application of a light source. The rare earth ion heavily-doped luminescent glass comprises the following components in percentage by mass: 50-68% of black talcum powder, 10-25% of LiF, 10-25% of NaF, 10-25% of CaF2, an externally-doped rare earth compound accounting for 15-25% of the total mass of other raw materials (black talcum powder + LiF + NaF + CaF2), and an externally-doped clarifying agent accounting for 0.5-2% of the total mass of other raw materials (black talcum powder + LiF + NaF + CaF2). The preparation raw materials of the luminescent glass are easy to obtain and low in price, the process is simple, and industrial production is easy; the emission peak of the obtained rare earth doped luminescent glass under the excitation of purple light / ultraviolet light is 450-750 nm, the internal quantum efficiency is greater than or equal to 85%, and the luminous intensity at 150 DEG C is more than 85% of the luminous intensity at room temperature. A light source packaged by the prepared luminescent glass has the characteristics of warm white light output, low color temperature (CCTlt, 4500K), high color rendering index (CRIGt, 90) and high lumen efficiency (LEgt, 851m / W).

The invention belongs to the technical field of light-emitting materials, and particularly relates to a near-infrared light-emitting ytterbium-doped quantum dot material and a preparation method and application thereof. According to the preparation method of the near-infrared light-emitting ytterbium-doped quantum dot material, a Yb-doped perovskite quantum dot synthesis method which is high in near-infrared light-emitting intensity, good in stability and simple in preparation is innovatively provided, short-chain amine is used in the preparation process, and the near-infrared light-emitting ytterbium-doped quantum dot material has high reaction activity, small steric hindrance and high near-infrared light-emitting efficiency. The complex ability with precursor raw materials is low, chemical bonds between halogen and metal ions are easy to open in the reaction process, and the complex is matched with long-chain amine (such as oleylamine and the like) in a perovskite quantum dot system prepared by a conventional injection method, so that doping of rare earth Yb ions is facilitated, the Yb ions smoothly enter perovskite crystal lattices, and the perovskite quantum dot is prepared. The near-infrared luminous intensity of the material is improved.

The invention relates to the technical field of organic and inorganic hybrid functional materials, in particular to a doped chiral metal halide material with light-induced circular polarization luminescence and a preparation method and application of the doped chiral metal halide material, the chemical formula of the doped chiral metal halide material is L2BnC1-nX4, and the value of n is 0 lt; n is less than 1. The fluorescence quantum yield of a film sample is remarkably improved by using a transition metal ion or rare earth ion doping method. According to the invention, the plug splitting energy in the chiral metal halide is adjusted, so that the chiral optical property of the film material is remarkably improved. The preparation process of the chiral metal halide thin film is simple, the thin film does not need to be prepared after a single crystal material is obtained through a harsh single crystal preparation method, and the material composition and the doping proportion can be easily adjusted according to the requirements of material properties. The invention provides a feasible way for regulating and controlling the chiral optical property of the chiral metal halide by doping transition metal ions or rare earth ions.

The invention provides a holmium and ytterbium co-doped mid-infrared microsphere Raman laser and a preparation method thereof, and relates to the technical field of laser preparation, the holmium and ytterbium co-doped mid-infrared microsphere Raman laser comprises an infrared transmission optical fiber, a pump light source, holmium and ytterbium co-doped tellurate glass microspheres and passive tellurate glass microspheres, pump light emitted by the pump light source is guided to a conical region through the infrared transmission optical fiber, and the holmium and ytterbium co-doped tellurate glass microspheres and the passive tellurate glass microspheres are arranged in the conical region; sequentially carrying out optical coupling with holmium and ytterbium co-doped tellurate glass microspheres and passive tellurate glass microspheres; in the holmium and ytterbium co-doped tellurate glass microspheres, the doping amount of the holmium element is 0.3%, and the doping amount of the ytterbium element is 0.45% according to the mass percentage. Compared with the prior art, through the cascade structure of the holmium-ytterbium co-doped microspheres and the passive microspheres, three-step wavelength conversion of pump light-rare earth ion lasing-Raman frequency shift is realized in a single system for the first time, and the wavelength limitation that a traditional single microsphere depends on a rare earth ion fixed energy level is broken through.

Heterogeneous photonic circuits comprise a gain section optically coupled to a photonics section. The gain section can include at least one gain waveguide which can be formed from a III-V semiconductor material to provide optical gain. The gain waveguide can be coupled to optical components in the photonics section to form an integrated pump module. The photonics section can include a light-generating photonic circuit, which can comprise at least one waveguide doped with a rare-earth ion or transition-metal ion. Output from the integrated pump module and / or the light-generating photonic circuit can be tunable. Tuning can be implemented with feedback control.

The invention belongs to the field of glass material research, and discloses a method for regulating and controlling rare earth ion clusters in laser glass based on molecular dynamics simulation and application of the method. Based on given glass components, density and atomic number, an initial amorphous structure model M0 is constructed; based on a molecular dynamics theory, performing high-temperature melting quenching simulation on the initial amorphous structure model M0, and constructing a glass structure model M; calculating glass microstructure parameters and designing rare earth ion cluster parameters based on atomic coordinate information of the glass structure model M; establishing a glass component-microstructure mathematical model and a microstructure-rare earth ion cluster mathematical model based on the glass components, the microstructure parameters and the rare earth ion cluster parameters; based on the model, regulation and control on the agglomeration degree of the rare earth ions in the glass are realized. According to the method, the problem that the rare earth ion clusters in the laser glass cannot be quickly and effectively regulated and controlled due to the fact that the rare earth ion clusters in the glass are difficult to quantitatively describe by experimental means is solved.

The invention discloses a short-path optical pulse based on a three-energy-level system, a generation method and application. Specific forms of Hamiltonian and Rabian frequency parameters thereof are constructed in a three-level quantum system, and the parameters are optimized to obtain a light pulse which enables an evolution path of a quantum state on a Bloch sphere to be shortest and is high in fidelity. According to the optical pulse obtained by the technical scheme, the quantum state can be changed into a target state from any initial state through a circular evolution path, and logic gate operation is executed. The evolution time of the gate can be effectively shortened through the circular evolution trajectory, and the quantum gate reduces the influence of environmental noise while keeping the robustness of the control error. According to the quantum logic gate, multi-parameter optimization is carried out on the optical pulse waveform, the quantum logic gate is suitable for a rare earth ion Pr < 3 + >: Y2SiO5 quantum bit system device and an inverted-V-shaped three-energy-level system, and the high-fidelity quantum logic gate is obtained.

The invention provides rare earth doped fluorescent powder capable of emitting light through polychromatic light excitation and thermal excitation and a preparation method and application of the rare earth doped fluorescent powder. The fluorescent powder comprises rare earth doped fluoride, the chemical formula of the rare earth doped fluoride is Cs2NaLnF6: xRe < 3 + >, wherein Ln represents a rare earth element, Re < 3 + > represents a doped rare earth ion, and Ln and Re < 3 + > are respectively selected from different rare earth elements; x is the doping amount of Re in each mole of rare earth doped fluoride, 0 lt; xlt; and 100 mmol%. According to the invention, the advantages of wide band gap and appropriate fluorine vacancy trap of the Cs2NaLnF6 material are utilized, and the trap distribution and luminescence performance of the material can be effectively regulated and controlled by doping different types of rare earth ions with different concentrations and contents; polychromatic light excitation and thermal excitation luminescence of one or more rare earth ions under different doping concentrations are realized, and the application potential is high. The Cs2NaLnF6 fluorescent powder composite film material disclosed by the invention is excellent in flexibility, good in water resistance, high in stability and simple in preparation process, and has a great application prospect in the fields of information storage, encryption, counterfeiting prevention and the like.

The invention relates to the technical field of biomass fibers, in particular to a modified biomass fiber for a resin anticorrosive coating as well as a preparation method and application of the modified biomass fiber, and the modified biomass fiber is a biomass fiber with a rare earth complex anchored on the surface; the rare earth complex is formed by combining rare earth metal ions serving as central ions with organic ligands through coordinate bonds; rare earth ions and organic ligands are grafted to the surfaces of the pretreated biomass fibers through chemical reaction, so that the binding capacity of the biomass fibers in resin can be improved, and the biomass fibers are endowed with fluorescence characteristics; and moreover, the biomass fibers subjected to fluorescence modification are doped into the resin coating, so that the integrity of the coating can be self-detected under ultraviolet light, and the effect of monitoring the resin coating in real time can be achieved.

The invention discloses a WS2 (Er < 3 + > + Yb < 3 + >) / WSe2 (Er < 3 + > + Yb < 3 + >) optical detector based on a rare earth ion co-doping technology, and relates to the field of a two-dimensional material rare earth ion co-doping technology and a two-dimensional material microcell fixed-point transfer technology, a WS2 (Er < 3 + > + Yb < 3 + >) layer synthesized by a chemical vapor deposition method is successfully transferred to a WSe2 (Er < 3 + > + Yb < 3 + >) surface layer by using a microcell fixed-point transfer method, and a WS2 (Er < + > Yb) / WSe2 (Er < + > Yb) vdW heterojunction is prepared; the method comprises the following steps: sequentially spin-coating LOR photoresist and S1805 photoresist on the surface of a sample 1, respectively carrying out soft baking treatment to obtain a sample 1, carrying out laser direct writing on a selected area to obtain a sample 2, removing metamorphic photoresist from the obtained sample 2 by using a developing solution, cleaning to obtain a sample 3, plating chromium and gold on the sample 3 by using a magnetron sputtering technology to obtain a sample 4, and carrying out drying to obtain a sample 5; and soaking the sample IV in acetone to dissolve the photoresist, and stripping a redundant metal layer under a microscope to obtain the Van der Waals heterojunction electrode device. Therefore, the invention provides the WS2 (Er < 3 + > + Yb < 3 + >) / WSe2 (Er < 3 + > + Yb < 3 + >) light detector based on the rare earth ion co-doping technology, the rare earth doping concentration of the two-dimensional material is improved, and excellent photoelectric properties of the WS2 (Er < 3 + > + Yb < 3 + >) and WSe2 (Er < 3 + > + Yb < 3 + >) two-dimensional semiconductor material are obtained.

The invention discloses cyan borosilicate glass and a preparation method thereof, and belongs to the field of optical materials. The borosilicate glass comprises the following components in percentage by weight: 20-45 mol% of SiO2; b2O3: 25 to 55 mol%; 20 to 35 mol% of SrO; eu < 2 > O < 3 >: 0.05 to 2.5 mol%; wherein the sum of the three components of SiO2, B2O3 and SrO is 100 mol%; wherein the external doping concentration or the internal doping concentration of the rare earth ions is 0.05-2.5 mol% of the sum of the three components of SiO2, B2O3 and SrO. The invention also discloses a method for preparing the borosilicate glass, the preparation temperature of the green borosilicate glass does not exceed 1460 DEG C, and Eu < 3 + > ions are reduced into Eu < 2 + > ions in an air atmosphere. The excitation wavelength of the cyan borosilicate glass is in the range of 230-420 nm, the cyan borosilicate glass is well matched with the characteristic wavelength of an existing commercial semiconductor chip, the quantum efficiency reaches up to 88.57% under excitation of 300 nm, the emission wavelength ranges from 470 nm to 500 nm under excitation of 410 nm, the defect of the cyan color in the full spectrum is well overcome, and the blue borosilicate glass can be applied to the field of semiconductor chips. And the method can be widely applied to the field of full-spectrum white-light LED illumination.

The invention belongs to the technical field of all-vanadium redox flow battery electrodes, and discloses a preparation method of a carbon cloth electrode for a vanadium redox flow battery, and the preparation method comprises the following steps: preparing a cobalt-nickel bimetal organic framework NiCo-MOF by a one-pot method, etching with plasma, dipping in a rare earth ion solution, drying, and calcining at high temperature to obtain a rare earth doped NiCo-MOF material; adding the rare earth doped NiCo-MOF material, a carbon nanotube, a dispersing agent, a surfactant, a stabilizer and a high-temperature cross-linking agent into deionized water, and dispersing to obtain modified carbon paste; and dipping carbon cloth in the modified carbon paste, drying after dipping, and sintering at high temperature to obtain the modified carbon cloth. The rare earth doped NiCo-MOF material is introduced to the carbon cloth, high-temperature calcination is carried out, rare earth ions are reduced under the action of H2, the rare earth ions and NiCo-MOF form a composite material, the crystallinity of the whole material is improved, the porosity of the MOF material and the high catalytic activity of rare earth are combined, and therefore the reaction activity of the carbon cloth and the battery performance are improved.

The invention relates to A-site double-rare earth ion co-doped antiferroelectric ceramic as well as a preparation method and application thereof. The general formula of the ceramic structure is Pb (1.01-1.5 n-y) MnCay (Zr < 1-x > Snx) 0.995 O3, wherein M comprises a rare earth element, and 0.3 lt; x is less than or equal to 0.5, 0.02 lt; n is less than or equal to 0.04, 0lt; y < = 0.03; the ceramic is constructed by multi-element A-site substitution, so that the stability of the antiferroelectric phase of the ceramic is improved, the densification growth is also promoted, and the breakdown electric field of the antiferroelectric ceramic is improved; meanwhile, the growth size of ceramic crystal grains can be inhibited, and the breakdown electric field of the ceramic is improved; the thickness of the anti-ferroelectric ceramic is 25-40 [mu] m, the energy storage density is 23-35 J / cm < 3 >, and the energy storage efficiency is up to 70% or above; compared with the prior art, the energy storage density of the prepared ceramic material is increased by 6-25 J / cm < 3 >, and the discharge time is remarkably shortened.

The invention provides a quantum storage device and a quantum storage method based on an optical resonant cavity. The quantum storage device comprises a light generation module which emits pump light and a light signal; the electric pulse generation module generates an electric pulse signal corresponding to the optical signal according to a preset storage mode; the storage module comprises a rare earth doped crystal, a first reflecting film on a first surface of the storage module and a second reflecting film on a second surface of the rare earth doped crystal form an optical resonant cavity, and a preset included angle is formed between the first surface and the second surface so as to change the resonant frequency of the optical resonant cavity; the optical waveguide array is arranged in the third surface of the rare earth doped crystal; the electrical waveguide array is arranged on the third surface and is electrically connected with the electrical pulse generation module, and the absorption band structure of the rare earth ions is changed through electrical pulse signals; an optical signal is coupled into the optical resonant cavity through the optical waveguide array and interacts with the rare earth ions in the optical resonant cavity, so that the population of the rare earth ions is excited to an optical upper energy level, and the optical signal is stored.

The invention discloses a preparation method of chromium-free fingerprint-resistant liquid for an aluminized zinc plate, and relates to the technical field of metal surface treatment materials.The preparation method comprises the steps that a benzotriazole-cerium molybdate composite corrosion inhibition system is constructed, and multiple layers of adsorption films are formed through intermolecular pi-pi accumulation and rare earth ion coordination; meanwhile, a graphene oxide / nano silicon dioxide synergistic enhancement system is introduced, graphene sheet layers are directionally arranged to form a physical barrier, and micropores are filled with nano particles to improve compactness; and meanwhile, a lanthanide rare earth compound is adopted for modifying the flash-rust inhibitor, the stability of a passivation film on the metal surface is enhanced through the empty orbital characteristic of rare earth elements, the nanometer material gradient dispersion technology is combined with the ultrasonic-mechanical coupling dispersion technology, filler uniform distribution and interface bonding strengthening are achieved, and the fingerprint resistance, corrosion resistance and the like of the film layer are effectively guaranteed.

The invention discloses a preparation method and application of a granzyme B response near-infrared two-region ratiometric fluorescent probe (DCGA). The DCGA combines the NIR-II dual-emission fluorescence characteristic of rare earth ions with a ratio-type signal response mode, the sensitivity and signal stability of in-vivo fluorescence imaging are greatly improved, ultralow or enhanced F1060nm fluorescence signals are respectively shown before and after interaction with granzyme B (GzmB), F1525nm fluorescence signals are almost kept unchanged, and the DCGA can be used for detecting the in-vivo fluorescence imaging of the granzyme B (GzmB). Therefore, the self-calibration ratio fluorescence imaging GzmB activity change is realized. The DCGA is applied to tumor treatment of immunotherapy drugs, and responders and non-responders of immunotherapy can be distinguished in a non-invasive early stage through ratio fluorescence signals of the DCGA. Therefore, the fluorescent probe can be used as an effective GzmB active NIR-II ratio fluorescence imaging tool, and is expected to provide powerful support for immunotherapy research, precision medicine and personalized diagnosis and treatment.

The invention discloses a dual-wavelength microsphere laser based on tri-doped rare earth ions and a preparation method thereof, the dual-wavelength microsphere laser based on tri-doped rare earth ions comprises a silica fiber, the middle part of the silica fiber is provided with a conical region; the pump light source is arranged at one end of the silica fiber; the erbium, holmium and ytterbium tri-doped tellurate glass microspheres are arranged in the conical region; pump light emitted by the pump light source is guided to the conical region through the single-mode optical fiber and is optically coupled with the erbium-holmium-ytterbium tri-doped tellurate glass microsphere; in the erbium-holmium-ytterbium triple-doped tellurate glass microspheres, infrared-transmitting tellurate glass is used as a matrix, and the doping amount of an erbium element is 0.11%, the doping amount of a holmium element is 0.22%, and the doping amount of an ytterbium element is 0.80% in percentage by mass. According to the dual-wavelength microsphere laser based on the three-doped rare earth ions, efficient and stable dual-wavelength laser output is achieved.

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 discloses a near-infrared light mediated heterogeneous composite photocatalyst as well as a preparation method and application thereof, the heterogeneous composite photocatalyst is an up-conversion luminescent material loaded semiconductor material, and can realize up-conversion luminescent catalysis under the irradiation of 980nm near-infrared light; the up-conversion luminescent material is rare earth ion doped fluoride nanoparticles, fluoride is one or two of yttrium fluoride and sodium yttrium tetrafluoride, the doped rare earth ions comprise rare earth luminescent center ions and light absorption ions, the luminescent center ions comprise one of Er < 3 + >, Tm < 3 + >, Tb < 3 + > and Pr < 3 + >, and the light absorption ions comprise Yb < 3 + >; the semiconductor material is of a heterojunction structure which is tightly formed by Co3O4 quantum dots and g-C3N4 nanosheets. The up-conversion nanoparticles are synthesized by adopting a simple hydrothermal method and are loaded on the g-CN nanosheets modified by the CoO quantum dots, and the obtained composite material can effectively convert near-infrared light into visible green light, so that generation of photocatalytic reaction species is increased, and the up-conversion nanoparticles are recycled and reused for multiple times without inactivation.

A method of transmitting at least one optical signal through an add-drop filter includes directing the at least one optical signal into a first tapered optical fiber of the add-drop filter. The add-drop filter includes an active resonator side-coupled between the first tapered optical fiber and a second tapered optical fiber, and the active resonator is doped with at least one rare earth ion. A tuned optical gain is produced by delivering a tuned amount of pump laser energy to the at least one rare earth ion at a sub-lasing level, the tuned optical gain configured to compensate an intrinsic loss of the active resonator.

The invention discloses a miniature all-optical-fiber pH sensor based on rare earth ion doped nanocrystalline and a preparation method and application of the miniature all-optical-fiber pH sensor. The micro all-optical fiber pH sensor comprises rare earth ion doped nanoparticles, a glass optical fiber microsphere cavity and an optical fiber optical path, and the rare earth ion doped nanoparticles are loaded on the surface of the glass optical fiber microsphere cavity. The rare earth ion-doped nano-particles are rare earth ion-doped nano-crystals or nano-particles formed by coating the rare earth ion-doped nano-crystals with a matrix, and the rare earth ion-doped nano-crystals have photoresponse to pH. The miniature all-optical-fiber pH sensor measures the pH value by utilizing sensitive response of luminescence of rare earth ions to acid and alkali, has high spatial resolution, can reach a micron level, has good stability, can stably measure in strong acid and strong alkali, and is strong in controllability and high in sensitivity. And real-time fixed-point pH value monitoring can be carried out in environments such as a closed space, a trace solution, a micro-scale region and a complex bending structure.

The invention relates to the technical field of batteries, in particular to a high-temperature-resistant lithium cobalt oxide positive electrode material and a preparation method and application thereof.The high-temperature-resistant lithium cobalt oxide positive electrode material comprises a lithium cobalt oxide matrix and a coating layer coating the surface of the lithium cobalt oxide matrix, the lithium cobalt oxide matrix is doped with Mg, Ti and La, and the coating layer is a fast ion coating layer of a Li-Gd-Ti-O4 spinel phase. Bulk phase doping is carried out through a high-temperature solid-phase method, Mg, Ti and La are doped in a lithium cobalt oxide matrix, and the lattice structure thermal stability of lithium cobalt oxide under high voltage (4.4 V) is improved; a fast ion coating layer of a Li-Gd-Ti-O4 spinel phase is formed on the surface of a lithium cobalt oxide matrix by adopting a solid phase method, and the comprehensive performance of the lithium cobalt oxide positive electrode material is improved through multiple mechanisms such as the lattice stabilization effect of rare earth ions, the interface barrier effect of composite oxide and lithium ion conductivity regulation and control; particularly, the capacity, the cycling stability, the thermal stability, the high-voltage tolerance and the like are realized.

The invention discloses a preparation process of a rare earth precipitation resistant electrophoretic coating for an automobile body. The preparation process comprises the following steps: S1, preparing a stable solution; s2, preparing a rare earth chelating solution; adding lanthanum lactate into the stable solution for multiple times, and adding ammonium ceric sulfate for multiple times after the lanthanum lactate is completely dissolved; s3, preparing a resin base solution; s4, preparing mixed slurry; s5, adding a solvent and an auxiliary agent; a five-membered ring chelate with thermodynamic stability is formed by carboxyl, hydroxyl and rare earth elements in sodium citrate, rare earth ions can be tightly wrapped through strong coordination bonds, namely, empty orbits of the rare earth ions and lone pair electrons of a chelating agent form coordination bonds, so that the rare earth ions cannot be dissociated in a system, and the rare earth ions are prevented from being dissociated in the system. And a path of generating hydroxide precipitates by free rare earth ions is thoroughly blocked, so that rare earth elements are effectively ensured to be uniformly distributed in the electrophoretic paint, and the surface of a raw material treated by a subsequent electrophoresis process is more uniform.

The invention discloses a synthesis method and application of rare earth silicate nano composite powder for an environmental barrier coating, and aims to solve the problems of silicon volatilization and poor thermal stability in the thermal spraying process of the rare earth silicate environmental barrier coating. The synthesis method comprises the following steps: 1, preparing asymmetric mesoporous silica based on a nano silicon source; 2, co-precipitating the asymmetric mesoporous nano silicon dioxide serving as a nucleation center and rare earth ions, and calcining to prepare high-activity nano precursor powder; and 3, uniformly mixing the nano precursor with potassium sulfate and sodium sulfate, and calcining to obtain the rare earth silicate nano powder. The asymmetric mesoporous silica is selected as a silicon source, a silicon-rich end is supplemented from the nanoscale, silicon loss caused in the spraying process is made up, meanwhile, the rare earth silicate nano-powder is prepared by combining a chemical coprecipitation method with a molten salt method, the effect of optimizing the purity of the nano-powder is achieved, preparation of a high-quality environmental barrier coating material is achieved, and the application prospect is wide. And the thermal stability of the environmental barrier coating is improved.

The invention discloses a method for preparing a polyphenylene sulfide-based membrane electrode in situ, which comprises the following steps: carrying out plasma treatment on polyphenylene sulfide cloth, soaking the polyphenylene sulfide cloth in an acid solution or an alkaline solution, cleaning and drying to obtain a hydrophilic polyphenylene sulfide membrane; then, a layer of PAN or PVP solution doped with rare earth ions or iron element ions is poured on the surface of the hydrophilic polyphenylene sulfide diaphragm, and after drying, the composite polyphenylene sulfide diaphragm is obtained; and performing laser engraving on the PAN or PVP polymer layer containing rare earth ions or iron-series element ions in the composite polyphenylene sulfide diaphragm by utilizing carbon dioxide laser engraving to form rare earth ion or iron-series element ion doped graphene, thereby obtaining the polyphenylene sulfide-based membrane electrode for alkaline electrolyzed water. The method has the advantages of low requirement on temperature, simplicity, feasibility, safety, controllability and low energy consumption, the electrode material is generated on the surface of the membrane in situ, and the possibility that the electrode falls off in the later use process is reduced.