200 results about "Upconversion luminescence" patented technology

The invention relates to the field of molecular photoelectric devices, and provides a single photon source based on an up-conversion photoelectric device and a preparation method thereof, and the preparation method comprises the steps: preparing a dielectric layer; preparing a graphene array electrode on the dielectric layer; constructing a graphene nano gap point electrode pair; placing the graphene nano gap point electrode pair in a two-neck flask, adding 1-(3-dimethylaminopropyl)-3-2-ethylcarbodiimide hydrochloride and an up-conversion luminescent molecule A part into the two-neck flask, adding anhydrous pyridine into the two-neck flask in a nitrogen environment, and stirring to obtain a graphene nano gap point electrode pair; and putting the device connected with an up-conversion luminescent molecule part A at two ends and an up-conversion luminescent molecule part B containing lanthanide metal into a tetrahydrofuran solution for molecular system chelation to obtain the single-molecule up-conversion photoelectric device containing the chiral group. A liquid metal Ga2O3 protective layer is plated on a single-molecule up-conversion photoelectric device, so that a single photon source is obtained, and the stability and the anti-interference capability of the single photon source are enhanced.

The invention belongs to the technical field of medical materials, and relates to a titanium-based implant surface dual drug release system and a preparation method and application thereof. Comprising a titanium-based implant and a hydrogel layer attached to the surface of the titanium-based implant, the surface of the titanium-based implant is of a nanotube array structure, zinc oxide nanoparticles and up-conversion luminescent material particles are arranged between the titanium-based implant and the hydrogel layer, and MgO2 nanoparticles are loaded in the hydrogel layer; wherein the material of the up-conversion luminescent material particles is NaYF4: Yb < 3 + >, Er < 3 + >, and the hydrogel layer is composed of gelatin-sodium alginate hydrogel. The titanium-based implant surface dual-drug release system provided by the invention can realize loading of different drugs, can be used for treating various diseases, has a better time sequence control effect, is long in action time and low in cost, and has a wide application prospect.

The invention belongs to the field of biological functional materials, and discloses rare earth up-conversion nanoparticles as well as a preparation method and application thereof. The rare earth up-conversion nanoparticles comprise an inner core and a shell layer, and the shell layer is formed by growing on the surface of the inner core through a one-pot method; the inner core is formed by taking beta-NaYF4 as a matrix and doping 0.4%-0.6% of Tm and 25% of Yb with rare earth nanoparticles; the chemical composition of the shell layer is NaYF4; the particle size of the core-shell double-layer structure of the rare earth up-conversion nanoparticle is 246.7 + / -43.2 nm; the polymer HPMCP is used for wrapping up-conversion nanoparticles and a prodrug for drug delivery and enteric release; 800nm up-conversion light generated by irradiation of low-power 980nm laser is used for nano material tracking, and ultraviolet up-conversion luminescence is generated under irradiation of high-power 980nm near-infrared laser to decompose prodrugs for drug release.

The invention discloses a red up-conversion luminescent material, which belongs to the field of inorganic luminescent materials, the chemical formula of the material is NaEr < 0.65 > F4: Yb < 0.2 > / Gd < 0.1 > / Tm < 0.05 >, and up-conversion microparticles of the red up-conversion luminescent material are used as a bifunctional luminescent temperature sensor which can be used for a 293348 K low-temperature region sensitization sensor and a 348498 K high-temperature region thermal quenching sensor. After near-infrared light with the wavelength of 980 nm excites Yb < 3 + > ions, through efficient energy transfer between Er < 3 + > and Tm < 3 + >, different changes of near-infrared response type 654 nm and 808 nm red up-conversion luminescence characteristics can be used for non-contact optical temperature measurement under the extreme temperature condition. Temperature detection is realized based on thermal coupling energy levels of 4F9 / 2 to 4I15 / 2 and 3H4 to 3H6, and the distance between two emission peaks is large, so that the data processing error is greatly reduced; excitation light and emission light are located in an optical window of the biological tissue, and absorption and self-fluorescence of the biological tissue are greatly reduced. The preparation method is based on the green chemistry concept, takes water as a solvent and adopts a one-step hydrothermal method for synthesis, the preparation method is simple, the required temperature is low, the preparation process is easy to control, the material crystal phase is good, the phase is uniform, the yield is high, the material performance is stable, and the good temperature response effect is achieved.

The invention relates to the technical field of analytical chemistry, and particularly discloses a double-signal ratio type up-conversion luminescent probe, a preparation method thereof and application of the double-signal ratio type up-conversion luminescent probe in oxalate detection, and the double-signal ratio type up-conversion luminescent probe comprises up-conversion nanoparticles UCNPs and an iron-chromium cyanine R compound. The upconversion nanoparticles UCNPs are combined with the iron-chromium cyanine R compound to construct a double-emission-peak regulation and control system, when the system is used for oxalate detection, oxalate can be chelated with Fe < 3 + > in the iron-chromium cyanine R compound, blue shift of an induced absorption spectrum is achieved, green and red emission peaks of the UCNPs are synchronously regulated and controlled, and the detection sensitivity is high. The fluorescent-colorimetric bimodal high-sensitivity detection of the oxalate is realized.

The invention relates to a near-infrared light response in-situ gelling and synergistic photo-thermal-photodynamic gel delivery system and a preparation method and application thereof, a mesoporous silicon coated up-conversion nano-carrier and an efficient photosensitizer are compounded to form a photo-response core unit, and then the photo-response core unit is intelligently integrated with photo-curing hydrogel to form the near-infrared light response in-situ gelling and synergistic photo-thermal-photodynamic gel delivery system. The general problem of aggregation and quenching of photosensitive molecules is relieved by utilizing the unique space confinement effect of the mesoporous structure, the ICG photo-thermal efficiency and photodynamic performance are enhanced, under precise excitation of a near-infrared light source, the system can activate a photo-crosslinking reaction through an up-conversion luminescence process, in-situ conversion from a liquid eye drop preparation to a stable gel state is achieved, and the stability of the eye drop preparation is improved. A lasting drug reservoir is formed on the surface of the cornea; synchronously excited photodynamic and photo-thermal dual-mode treatment generates a remarkable synergistic antibacterial effect, and shows an excellent removal capability on pathogens including highly drug-resistant bacteria; meanwhile, an ideal microenvironment is created for tissue repair through high biocompatibility and a stable mechanical matrix, and integrity recovery of cornea structures and functions is promoted.

The invention discloses a metasurface structure for realizing terahertz up-conversion luminescence, and belongs to the technical field of optics, the metasurface structure comprises a silicon dioxide substrate, a metal microstructure unit and a quantum dot luminescent material, and is innovatively provided with a dielectric isolation layer and a surface plasma enhancement layer, the dielectric isolation layer reduces the quenching effect of metal on quantum dots, and the surface plasma enhancement layer enhances the surface plasma on the quantum dots. The surface plasma enhancement layer enhances a local electric field. The metasurface structure for realizing terahertz up-conversion luminescence can effectively improve the terahertz visible light up-conversion efficiency, realizes high-sensitivity and quick-response terahertz detection at room temperature, improves the detection sensitivity, simplifies a detection system, has a wide application prospect in the fields of biomedicine, security inspection, communication and the like, and has a wide application prospect in the fields of biomedicine, security inspection, communication and the like. And the practical application development of the terahertz technology is promoted.

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.

The invention belongs to the technical field of temperature sensors, and particularly relates to an up-conversion luminescence temperature sensor based on a plasmon effect and preparation and application thereof. The core of the sensor provided by the invention is a composite structure formed by a gold nanorod array and Er < 3 + > and Yb < 3 + > co-doped NaYF4 up-conversion nanoparticles, and the gold nanorod array is prepared by adopting a two-way aluminum oxide template method and is regularly and orderly arranged in a hexagonal shape. Under the excitation of 980nm near-infrared light, the local surface plasmon resonance effect of the gold nanorods can significantly improve the up-conversion luminescence intensity and accelerate the thermal response rate of the sensor; the ratio type temperature sensing system is constructed by detecting the fluorescence intensity ratio of two emission bands of 515-535 nm and 535-555 nm, self-calibration accurate detection within the temperature range of 303-348 K can be achieved, and the sensor has the advantages of being uniform in structure, controllable in preparation, high in detection sensitivity, high in response speed and the like.

A method for preparing a dual-mode immune structure based on a surface-enhanced Raman substrate and an up-conversion luminescent probe, and an application thereof. The dual-mode immune structure based on a surface-enhanced Raman substrate and an up-conversion luminescent probe comprises a copper / black phosphorus / silver nanoflower composite immunosubstrate and a NaGdF4:Yb3+ / Er3+ up-conversion nanoparticle immunoprobe, wherein the copper / black phosphorus / silver nanoflower composite immunosubstrate is prepared using an electrochemical reduction method, and the NaGdF4:Yb3+ / Er3+ up-conversion nanoparticle immunoprobe is prepared using a hydrothermal method. During the application to cancer detection, assembling an immunosubstrate and an immunoprobe realizes the combination of up-conversion luminescence and surface-enhanced Raman spectroscopy technology for realizing dual-mode detection of cancer biomarkers. Thus, simple operation and high detection sensitivity are achieved, thereby facilitating efficient and precise clinical screening and identification of cancer biomarkers.

The invention discloses GPU chip forming equipment and a chip packaging method, and the method comprises the steps: injecting bottom filling resin containing an ultraviolet light initiator, a latent thermal initiator, up-conversion luminescence nanoparticles and magnetic induction heating nanoparticles into a gap between a bare chip and a substrate, and forming a functional resin layer; performing ultraviolet irradiation on the peripheral area, so that the photoinitiator is polymerized to release heat and activate the latent thermal initiator to generate a thermal polymerization reaction frontal surface which is propelled from outside to inside; near-infrared light is transmitted through a bare chip to excite up-conversion luminescent nanoparticles to release ultraviolet light in a shading area, and the ultraviolet light and a thermal polymerization reaction frontal surface cooperate to initiate resin polymerization in the shading area; applying an alternating magnetic field to the initially cured resin layer, exciting magnetic induction to heat the nanoparticles to generate induction heat to trigger the residual latent thermal initiator to complete deep curing and release residual stress; and gradient cooling and constant-temperature aging treatment are executed. According to the invention, the uniform deep curing of the filling resin at the bottom of the GPU chip can be realized in an all-black workshop environment.

The invention relates to an up-conversion infrared photon contact lens as well as a preparation method and application thereof, and belongs to an infrared visual material. Wrapping the surface of the solid nanometer microsphere with the up-conversion nanometer particles to form an up-conversion luminescence core-shell structure microsphere; dispersing the up-conversion core-shell structure microspheres in an acrylate solution to prepare an up-conversion luminescent layer (UCL); dispersing polymer microspheres in an acrylate solution to prepare an up-conversion light reflecting layer (GRL); dispersing the solid nano-microspheres in an acrylate solution to prepare an infrared reflection layer (IRL); dispersing the hollow nano-microspheres in an acrylate solution to prepare a surface antireflection layer (ARL); and further obtaining the up-conversion infrared photon contact lens. The contact lens prepared by the invention has excellent up-conversion luminescence performance and a good wearing function, and can realize efficient utilization of infrared photons so as to realize visualization of infrared light.

The invention discloses an upconversion luminescent material with inverse thermal quenching and thermal quenching functions, and belongs to the field of rare earth luminescent materials, the chemical formula of the material is NaEr0. 695F4: Yb0.2 / Gd0.1 / Eu0.005, the material morphology is in a micron-scale hexagonal disc shape, and NaEr0. 695F4: Yb0.2 / Gd0.1 / Eu0.005 upconversion microparticles are used as a bifunctional upconversion luminescent temperature sensor, a sensitization sensor and a thermal quenching sensor, and can be used for detecting the temperature of a luminescent device. And the method can also be used for non-contact optical temperature measurement or high-sensitivity optical temperature measurement under an extreme temperature condition. The temperature detection is realized based on the thermal coupling energy level, the distance between two emission peaks is large, and the data processing error is greatly reduced; the up-conversion luminescence intensity of the energy level can be enhanced along with the rise of the temperature and is called inverse heat quenching, and the temperature sensing performance is better. The invention also discloses a preparation method of the material, the operation is simple, the material crystal phase is good, the phase is uniform, the yield is high, the material performance is stable, and the material has a good bifunctional temperature response effect.

The invention belongs to the technical field of functional ceramic materials, and particularly relates to luminous multifunctional ZnO-Bi2O3-based voltage-sensitive ceramic as well as a preparation method and application thereof. The luminous multifunctional ZnO-Bi2O3-based voltage-sensitive ceramic provided by the invention has up-conversion luminescence performance, can detect red emitted light under the excitation of 980nm laser, has a high nonlinear coefficient, is adjustable between 34 and 40.3, has excellent comprehensive performance, and can be used for ensuring the nonlinear coefficient alphagt; when the voltage is 30, the voltage-sensitive voltage is as low as 424.2 V / mm, the leakage current IL is as low as 1.8 [mu] A / cm < 2 >, the energy consumption is low, the cost is low, and the method is green and environment-friendly.

The invention relates to the technical field of human skin surface temperature and strain measurement, in particular to a multifunctional health detection method based on an up-conversion fluorescent material. The device provided by the invention accurately detects the changes of the human body temperature and the surface strain by analyzing the up-conversion luminescence spectrum. According to the technology, the precision and stability of human body temperature detection are remarkably improved, and continuous monitoring of strain changes of the human body surface can be achieved. The temperature and strain detection principles of the device are independent, dual detection can be carried out simultaneously, and detection results do not interfere with each other. The adopted polymer optical fiber has good biocompatibility and mechanical stretchability, can be tightly attached to the skin of the human body, and is suitable for being worn for a long time. By using the polymer optical fiber consisting of different types of up-conversion fluorescent particles, multi-point detection can be realized, and the detection efficiency is remarkably improved. Through strict reliability test and optimization, the long-term stability and availability of the device are ensured.

The invention provides and discloses an anti-counterfeiting material based on multi-mode invisible light fluorescent powder and a preparation method and application thereof, the fluorescent powder is Mg3Y2Ge3O12: Bi < 3 + > / Pr < 3 + > / Yb < 3 + > / Er < 3 + >, triple independent luminescence is realized through quaternary ion co-doping: 980nm near-infrared excitation green up-conversion luminescence (UCL) and 254nm ultraviolet excitation red down-conversion luminescence (DCL), 328nm deep ultraviolet long afterglow (PersL) is generated after ultraviolet excitation is stopped, and the fluorescent powder can be used for preparing anti-counterfeiting materials. Wherein the ultraviolet PersL needs to be detected by special CCD (Charge Coupled Device) equipment to form an invisible hidden layer; during verification, naked eye observation (UCL / DCL) and equipment reading (PersL) are combined to realize four-stage dynamic anti-counterfeiting. The limitation of dependence on visible light in the prior art is broken through, double anti-counterfeiting logic of visible information and hidden ultraviolet verification is formed, the anti-counterfeiting safety level is remarkably improved, and the material stability is excellent.

The invention relates to the technical field of nano materials and biomedical engineering, and discloses a dye-sensitized rare earth up-conversion luminescent nano material as well as a preparation method and application thereof. The dye-sensitized rare earth up-conversion luminescent nano-material comprises a rare earth doped up-conversion nano-particle core, an unsaturated fatty acid salt self-assembled shell layer and a near-infrared dye modified on the surface of the rare earth doped up-conversion nano-particle. The unsaturated fatty acid salt coating layer endows the material with excellent water dispersibility through a hydrophilic group; a hydrophobic chain segment and an unsaturated double bond can effectively block water and oxygen permeation and quench singlet oxygen, so that the photobleaching half-life period of the material is increased by 86.7 times or more compared with that of a conventional coating material, and the light stability is excellent; the material successfully realizes efficient up-conversion luminescence under excitation of a low-power near-infrared light emitting diode (NIR LED, the power density of which can be as low as 100mW / cm < 2 >), and thoroughly gets rid of dependence on a high-cost and high-risk laser.

The present invention relates to the field of nanomaterial synthesis, and discloses an upconversion luminescent material, a preparation method thereof, and an application thereof. The preparation method of the upconversion luminescent material comprises: (1) first stirring an ytterbium salt solution, an ammonium molybdate tetrahydrate solution, and a rare earth metal salt solution to obtain an intermediate I; the rare earth metal salt in the rare earth metal salt solution is selected from at least one of an erbium salt, a holmium salt, a praseodymium salt, and a europium salt; (2) subjecting the intermediate I to a hydrothermal reaction in a hydrothermal reactor to obtain an intermediate II; and (3) sequentially subjecting the intermediate II to a drying treatment and a calcination treatment to obtain the upconversion luminescent material. The upconversion luminescent material particles prepared by the method of the present invention have an average particle size of nanometer level, a good degree of crystallinity, and good reverse thermal quenching performance.

The invention discloses an up-conversion luminescence modified BiOBr-based composite photocatalyst and a preparation method thereof. The preparation method comprises the following steps: preparing a raw material A into an aqueous solution to obtain a turbid liquid; adding a polymer additive into the turbid liquid to obtain a precursor solution; putting the precursor solution into a hydrothermal reaction kettle for hydrothermal reaction to obtain white powder; centrifuging the white powder, washing and drying to obtain upconversion particles; fully and uniformly mixing the raw material B with up-conversion particles and ethylene glycol to obtain a turbid liquid; adding a polymer additive into the turbid liquid, fully and uniformly mixing to obtain a precursor solution, putting the precursor solution into a solvothermal reaction kettle to obtain powder, and centrifuging, washing and drying the powder to obtain the composite photocatalyst. The photocatalyst disclosed by the invention has a certain absorption effect on ultraviolet-visible-infrared band sunlight, so that the utilization efficiency of the photocatalyst on the sunlight is improved; the specific surface area is large, the adsorption capacity on pollutants is high, and degradation on the pollutants is facilitated.

The invention provides a detection method and a detection device for water temperature and organic matters in water, trace organic matters in a flowing water body are detected based on the change of an up-conversion luminescence peak intensity ratio corresponding to a first characteristic peak and a second characteristic peak in an up-conversion luminescence spectrum of sodium yttrium tetrafluoride particles (NaYF4: Yb, Tm), and the trace organic matters in the flowing water body are detected based on the change of the up-conversion luminescence peak intensity ratio corresponding to the first characteristic peak and the second characteristic peak in the up-conversion luminescence spectrum of the sodium yttrium tetrafluoride particles (NaYF4: Yb, Tm). The temperature change of the flowing water body is detected according to the change of the up-conversion luminescence peak intensity ratio corresponding to the third characteristic peak and the fourth characteristic peak in the up-conversion luminescence spectrum. The method can be used for efficiently detecting the organic matters in the water and detecting the temperature of the water body, has universality, is simple and quick, does not need to generate fluorescence by the target organic matters, and is wide in applicability.

The invention relates to an aqueous-phase bio-friendly wide-spectrum up-conversion luminescent mixed-phase CdSe: Yb quantum dot and a preparation method thereof, and belongs to the field of nano luminescent materials. Comprising the following steps: preparing a Se precursor, preparing a Cd + Yb precursor, injecting a Se precursor solution into a Cd + Yb precursor solution according to the molar ratio of Se to Cd + Yb of 1: 3-1: 5, heating from room temperature to 80-90 DEG C in 5-10 minutes, heating from 80-90 DEG C to 100-110 DEG C in 20-30 minutes, continuously heating at the temperature of 100-110 DEG C, condensing, refluxing and reacting for 2-4 hours, and finally generating cubic phase and hexagonal phase coexisting CdSe: Yb quantum dots. The CdSe: Yb quantum dot is low in toxicity and biological friendly, promotes reproduction of macrophages swallowing the quantum dot, and is suitable for tracing cells under weak-intensity multiple full-wave band exciting light matched with a biological fluorescence microscope.

The invention provides an optical encryption communication method and system based on up-conversion pulse response, and relates to the technical field of information encryption, and the method comprises the steps: converting to-be-encrypted original data into coded data according to a preset transcoding rule; according to the coded data and a luminescence characteristic mapping table, target excitation parameters of the laser pulse are determined, the target excitation parameters comprise the target width of the laser pulse, and the luminescence characteristic mapping table is used for representing luminescence characteristics of each luminescence wave band in the up-conversion luminescent material; and exciting the up-conversion luminescent material by using a laser pulse with a target excitation parameter, so that the up-conversion luminescent material emits a fluorescence signal corresponding to the coded data. Therefore, the target excitation parameter of the laser pulse can be determined by utilizing the light emitting characteristic of the light emitting wave band in the up-conversion light emitting material, so that the emission of the fluorescence signal is realized, namely, the encrypted communication can be realized by controlling the laser pulse without switching and controlling multiple light sources, and the efficiency of the encrypted communication is improved.

The invention provides a synthesis method of infrared light excited Na5Lu (MoO4) 4 matrix green light emitting fluorescent powder. The synthesis method is characterized in that the Na5Lu (MoO4) 4 matrix green light emitting fluorescent powder is light pink powder. The preparation method comprises the following steps: firstly, weighing corresponding oxides, molybdate and the like, mixing the weighed substances, uniformly grinding in an agate mortar, putting into a corundum crucible, putting into a muffle furnace, calcining for 4 hours at 600 DEG C in an air atmosphere, cooling to room temperature, taking out and grinding; according to the green light emitting fluorescent powder prepared by the method, the up-conversion luminous efficiency is improved to a great extent, and the energy consumption is reduced; the fluorescent powder has potential application in the aspects of laser anti-counterfeiting, LED devices and imaging. Er < 3 + > / Yb < 3 + > is doped with a Na5Lu (MoO4) 4 matrix, and molybdate green light emitting fluorescent powder is prepared in an infrared excitation range through energy transfer between ions.

The chemical composition of the Cr < 3 + > doped scandium tungstate SWO: Yb / Cr is Sc2 (WO4) 3: x% Yb < 3 + > / y% Cr < 3 + >, x is greater than or equal to 20 and greater than or equal to 1, y is greater than or equal to 0.1 and greater than or equal to 10, Yb < 3 + > is a sensitizer ion, and Cr < 3 + > is an activator ion. The Cr < 3 + > doped scandium tungstate SWO: Yb / Cr is applied to construct a ratio type fluorescence temperature sensor, and tests show that the relative sensitivity of the fluorescence temperature sensing of the ratio type fluorescence temperature sensor constructed by the invention reaches 4% K <-1 >, the absolute sensitivity reaches 7.4% K <-1 >, and the temperature measurement range is 300-440K.

The invention discloses an up-conversion luminescence time sequence regulation color-changing material, color-changing ink and a preparation method and application thereof, the chemical general formula of the material is SrMoO4: xYb < 3 + >, yHo < 3 + > and zNa < + >, x is the molar doping amount of Yb < 3 + >, y is the molar doping amount of Ho < 3 + >, z is the molar doping amount of Na < + >, 0.10 < = x < = 0.40, 0.01 < = y < = 0.03, and 0.21 < = z < = 0.31. According to the material, under the condition of charge compensation ion Na < + > co-doping, the solid solubility of sensitizer ions Yb < 3 + > in SrMoO4 crystal lattices is remarkably improved, and under the condition of Na < + > excessive charge compensation, the material is remarkably superior to the upconversion luminescence effect of other charge compensation enhanced heterovalent doping systems reported in literatures; the color-changing ink for advanced dynamic anti-counterfeiting and the application method thereof are designed and developed by combining the remarkably enhanced up-conversion luminescence and the excellent time sequence regulation color-changing characteristic of the material, and the color-changing ink has a wide application prospect in the field of dynamic fluorescent anti-counterfeiting.

The invention discloses a method for regulating and enhancing ultraviolet fluorescence of rare earth up-conversion nanocrystals through a local structure and a method for measuring the local structure, and belongs to the field of rare earth luminescent nanomaterials. According to the method, in the process of synthesizing the LiREF4: coated LiREF4 core-shell structure, the stoichiometric ratio of LiOH and NH4F in a core layer and / or the use amount of lithium trifluoroacetate in a shell layer are precisely regulated and controlled, and the localized crystal field environment around activated ions is changed, so that the selective regulation and control on the luminescence transition path of the activated ions are realized, and the emission intensity of multiphoton ultraviolet up-conversion luminescence is improved. According to the method, the high-order multi-photon up-conversion process of rare earth ions can be remarkably enhanced, meanwhile, low-order emission is inhibited, the luminescence selectivity of an up-conversion nano material is improved, emission light with the corresponding wavelength can be synthesized from the same matrix material according to the requirements of synthesizers, and the method can be suitable for various rare earth active ions and matrix materials and has a wide application prospect. The method has application potential in the fields of nano photonics and biomedicine.

The invention discloses a panchromatic up-conversion single nanocrystal excited by single wavelength as well as preparation and application of the panchromatic up-conversion single nanocrystal. And the up-conversion single nanocrystalline rare earth is doped with up-conversion luminescent nanoparticles UCNPs. The structural composition of the UCNPs is NaYbF4: Er NaYbF4 NaYbF4: Yb, Tm, the UCNPs is realized by constructing a core / shell / shell structure, and the reasonably designed architecture modulates the excitation power density by utilizing a photon-level dependent up-conversion process, so that the emission of green light, red light and blue light is realized. Along with the increase of the power density of the 980nm continuous wave laser, the emission color is systematically changed from green to red and finally to blue. The invention provides a simplified but highly universal excitation scheme for complete RGB adjustability, and has wide application prospects in the fields of advanced high-resolution color displays, anti-counterfeiting, multifunctional biological probes, drug controlled release and the like.

The application discloses a kind of near-infrared benzothiadiazole dye sensitized rare earth upconversion luminescence nano-probes and preparation method thereof;Probe is composed of near-infrared benzothiadiazole dye and upconversion nanoparticle, benzothiadiazole dye is compounded with ligand-free lanthanide ion doped upconversion nanoparticle, and upconversion luminescence is enhanced.This application preparation method is simple, and it does not involve complex core-shell structure and energy migration process, benzothiadiazole dye is directly compounded with ligand-free rare earth nanoparticle, and upconversion luminescence nano-probe is formed, under the irradiation of 808nm laser, the emission spectrum of benzothiadiazole dye and the absorption spectrum of sensitizer ion in upconversion nanoparticle overlap, which can effectively enhance the upconversion luminescence intensity of nano-probe, and keep good light stability, keep more than 90% of initial luminescence intensity under the irradiation of 120 minutes excitation light.

According to the method for expanding the light absorption range of the photocatalytic material and improving the photocatalytic hydrogen production performance, WO3 rich in oxygen vacancies is doped with rare earth ions Yb < 3 + > and Er < 3 + > to achieve up-conversion luminescence, WO3: Yb < 3 + > and Er < 3 + > serve as sensitizers to form a composite material of a core-shell structure with photocatalytic semiconductors ZnxCd1-xS, Zn I n2S4 and the like, and the photocatalytic hydrogen production performance is improved based on two-photon absorption of WO3 and up-conversion luminescence of rare earth ions. In the composite material, simultaneous transmission of high-energy electrons and photons from the sensitizer to the photocatalyst is realized, and the purpose of hydrogen production by light-light and light-electricity synergistic sensitization photocatalytic reduction of water is achieved. Through the synergistic effect of two-photon absorption of WO3 rich in oxygen vacancies and rare earth ion up-conversion luminescence, the composite material is compounded with the WO3 on the basis of not changing the structure of a photocatalytic semiconductor by adopting a mild method, the composite material can produce hydrogen under ultraviolet-visible-near infrared light illumination, and the solar photocatalytic hydrogen production performance of the composite material is remarkably improved.

The invention relates to the technical field of ceramic glaze preparation, and discloses an additive for stabilizing firing color development of a ceramic glaze and a method thereof. Comprising 20-30 parts of magnesium oxide, 15-20 parts of zinc oxide, 5-10 parts of tin oxide, 10-15 parts of sodium phosphate, 3-5 parts of rare earth oxide, 3-5 parts of layered dihydroxy hydroxide, 0.5-1.2 parts of up-conversion luminescent nanoparticles, 2-3 parts of a magnetic composite medium and 5-8 parts of nano barium titanate. Oriented arrangement of SnO2 crystal grains is realized through magnetic field induction of a Fe3O4 coated SiO2 core-shell structure, rare earth ions are released in a gradient manner in combination with layered dihydroxy hydroxide, and a microwave-magnetic field-laser multi-physical field coupling gradient firing process is cooperated, so that the specular reflectance and optical uniformity of a glaze surface are remarkably improved, pigment decomposition in a high-temperature stage and generation of crystal boundary defects are inhibited, and the glaze quality is improved. The color development stability and the energy consumption efficiency are synchronously improved, and the problems of light scattering misalignment, rare earth chelation failure and glaze layer performance degradation caused by thermal field regulation lag due to disordered arrangement of crystal grains in the traditional process are solved.