162 results about "Upconversion luminescence" patented technology

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 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 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.

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.

The invention provides an all-dielectric grating quasi-BIC up-conversion luminescence enhancement structure and application thereof. The all-dielectric grating quasi-BIC up-conversion luminescence enhancement structure comprises a substrate; wherein a plurality of silicon nitride gratings are arranged on the upper surface of the substrate at equal intervals, interval grooves are formed between the adjacent silicon nitride gratings, and conversion nanoparticles are arranged in the interval grooves. The in-plane symmetry is destroyed by introducing perturbation, so that SP-BIC can be converted into qBIC, a local electric field in a grating gap is remarkably enhanced, the up-conversion nanoparticles are arranged in the grating gap, the up-conversion emission intensity is enhanced, and compared with traditional surface plasma up-conversion enhancement, the theoretical luminescence enhancement factor reaches 1.58 * 10 < 15 >.

The application belongs to the technical field of new materials, and discloses a reinforced rare earth doped upconversion luminescence metal organic framework material, a preparation method and application, a basic building unit of the material has a chemical formula of C4HO8Ln, and is recorded as Ln-MOFs, wherein the Ln site is jointly occupied by one, two or three different rare earth ions, including a sensitizing agent rare earth ion, an activator rare earth ion and an energy mediating node rare earth ion; the Ln-MOFs are prepared by a high-temperature solvothermal method, and a three-dimensional framework is constructed by taking rare earth ions as metal centers and oxalic acid and formic acid as organic ligands, wherein the formic acid is derived from in-situ decomposition of a DMF molecule under high temperature. Under excitation of 980 nm near-infrared light, the three-doped Ln-MOFs have a significantly improved upconversion luminescence intensity of Ho 3+ . The upconversion luminescence intensity of Ho 3+ is significantly improved by taking the energy mediating node. The material prepared by the application can be widely applied in the fields of optical anti-counterfeiting and information security storage.

The present application belongs to the technical field of luminescent materials, and particularly relates to a calcium stannate color-changing material and a preparation method thereof. 2.015‑ x Ho 0.005 SnO4:xYb 3+ wherein x is 0-0.07. The calcium stannate color-changing material provided by the present application has more obvious color-changing effect, higher color-changing rate and light intensity control rate, and has up-conversion luminescence intensity control and down-conversion luminescence intensity control performance at the same time, as compared with the color-changing ceramic obtained by doping a calcium stannate matrix with Al 3+ or Eu 3+ .

The invention discloses a preparation method and application of an up-conversion luminescent eutectic material, and belongs to the technical field of luminescent materials, the eutectic material is formed by mixing a matrix crystal phase and an up-conversion luminescent crystal phase, the matrix crystal phase is Al2O3, and the up-conversion luminescent crystal phase is gadolinium aluminate crystal Gd1-x-yAlO3: xYb < 3 + >, yRE < 3 + >, the two crystal phases have a synergistic effect, so that the thermal quenching phenomenon of the luminescent crystal phase is reduced, and high-sensitivity fluorescence temperature measurement is realized.

The invention discloses an up-conversion luminescent nano composite material and a preparation method and application thereof, and belongs to the technical field of up-conversion nano materials, and the up-conversion luminescent nano composite material comprises a NaYF4: 20% Yb, 2% Er and gold nanoparticle double-layer structure. Through the strategy of preparing the double-layer up-conversion luminescent nanocomposite, the obtained nanocomposite has the characteristics of high conversion efficiency, high fluorescence intensity, uniform distribution and the like, and is suitable for environmental analysis and detection.

The application discloses a dual-frequency excitation up-conversion luminescence glass ceramic, a preparation method thereof and a three-dimensional display device. The dual-frequency excitation up-conversion luminescence glass ceramic comprises 40-80 mol parts of TeO2, 10-40 mol parts of ZnO, 5-60 mol parts of GeO2, 0.01-5 mol parts of ErF3 and 0.1-10 mol parts of CaF2. The dual-frequency excitation up-conversion luminescence glass ceramic can generate high-brightness and high-contrast green light under the common excitation of near-infrared light of two different wavelengths of 850 nm and 1550 nm, and has high luminescence efficiency, and can be widely applied in the fields of three-dimensional display, solar cell, optical switch and laser.

This invention provides a three-layer core-shell structured rare-earth upconversion luminescent material, its preparation method, and its application, relating to the field of luminescent material technology. This invention provides a three-layer core-shell structured rare-earth upconversion luminescent material with NaYF4:Er 3+ With NaYF4:Yb as the core 3+ The core-shell structure consists of an intermediate shell and a NaYF4 outer shell. This novel three-layer core-shell structure reduces surface defects and solves the problem of easy quenching. It exhibits strong single-band red light emission performance, and its upconversion luminescence performance is significantly improved compared to existing materials. It demonstrates excellent luminescence performance and good biological stability, and can be applied in fields such as biomedicine and infrared detection, providing a new material for further expanding its application in the field of luminescence.

The invention relates to the technical field of upconversion materials, and particularly provides a core-shell structure upconversion material and a preparation method thereof. The structure of the upconversion material with the core-shell structure is NaLnF4: RE13 < + >, RE23 < + > and Ag2S. The invention also provides a preparation method of the up-conversion material with the core-shell structure. According to the method, toxic gas H2S does not need to be used, the coating process of the Ag2S shell layer can be completed through a one-step solvothermal method, the process is simple, safe and suitable for large-scale preparation, the problems of process complexity and safety existing in the prior art are fundamentally solved, and the obtained core-shell structure up-conversion material shows an excellent luminous effect and is suitable for large-scale preparation. The up-conversion luminescence quantum yield under the excitation of 980nm laser is not less than 7%.