18 results about "Upconversion luminescence" patented technology

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 application discloses a kind of high transparent rare earth nanoparticles / cage polysilsesquioxane composite photoresist and its preparation method and application, the photoresist includes the composite matrix consisting of cage polysilsesquioxane, multifunctional acrylate and photoinitiator, and the rare earth nanoparticles modified by bifunctional ligand.The bifunctional ligand anchors nanoparticles by first functional group, and forms chemical bonding with matrix by second functional group, realizes the atomic level uniform dispersion of nanoparticle.The photoresist has very high optical transparency, high-efficiency up-conversion luminescence performance and very high ultraviolet photosensitivity.Its preparation process is simple, without high-temperature expensive equipment, can be adapted to a variety of photo-curing technology realizes the integration precision forming of complex three-dimensional structure luminescence device, has wide application prospect in integrated photonics device field.

This invention discloses a photosensitizer with twisted π-conjugated charge transfer properties, its preparation method, and its applications. The preparation method of the photosensitizer includes the following steps: dissolving a quinolino[3,2,1-de]acridin-5,9-dione derivative, a perylene diimide with brominated position, and a basic substance in a first solvent to obtain a mixture; reacting a palladium catalyst with the mixture under a protective atmosphere; and after the reaction, extracting and purifying to obtain the photosensitizer with twisted π-conjugated charge transfer properties. The photosensitizer prepared by this invention uses a perylene diimide photoabsorbent group as an electron acceptor, which is then coupled with an electron donor group through a ring-closure reaction to prepare a photosensitizer with a twisted π-conjugated structure. The compound prepared by this invention has a long excited-state lifetime, high intersystem crossing efficiency, and suitable energy level structure, making it an ideal candidate material for photosensitizers and suitable for upconversion luminescence systems and visible light photocatalytic oxidation reactions.

The application discloses a novel multi-mode display material and a preparation method thereof. The novel multi-mode display material comprises a multi-mode display layer, and the multi-mode display layer is formed by compounding a CLCE matrix and an up-conversion luminescent material. The CLCE matrix is a controllable cross-linking density elastic network with a spiral superstructure, and the spiral pitch of the CLCE matrix is regulated by a chiral agent concentration, a mechanical force or heat, so that a photonic band gap is regulated. Meanwhile, the chiral agent can also regulate a chiral selective reflection function through the chirality of the chiral agent. The up-conversion luminescent material comprises a functionalized luminescent component, the functionalized luminescent component is combined with the CLCE matrix through a covalent grafting or an adaptive dispersion mode, and the functionalized luminescent component can generate up-conversion luminescence under excitation of specific wavelength light. Through the synergistic effect of the CLCE matrix and the up-conversion luminescent material, the multi-mode display layer has four-dimensional orthogonal optical functions of mechanical response, thermal response, light response and chiral selective reflection.

The present application relates to the field of biological medicine nanomaterials, and particularly relates to a kind of nanocomposite material and its preparation method and application.The preparation method of nanocomposite material provided by the present application, first, by a kind of room temperature fast, green method is synthesized hollow sodium bismuth fluoride carrier, and doping makes it have excellent upconversion luminescence performance, then using the excellent surface area of hollow sodium bismuth fluoride is successfully loaded photosensitizer MC540, clothing mould toxin, finally using DSPE-PEG-FA is modified, obtains nanocomposite material.It can effectively activate tumor cell endogenous calcium overload, induce tumor cell pyroptosis, realize the effect of efficient cancer treatment.

This invention discloses a multi-stimulus-responsive upconversion luminescent nanocrystalline magnetic microsphere and its preparation method, belonging to the field of biomedical polymer materials and nanobiotechnology. The microsphere's main body is a porous copolymer matrix, encapsulating a core of magnetite (Fe3O4) magnetic nanocrystals. Rare-earth-doped fluoride upconversion luminescent nanocrystals are coupled to the surface and pores. The copolymer side chains of the microsphere incorporate azide groups, acidic stimulus-responsive groups, and photostimulation-responsive groups, constructing an independent and non-interfering triple orthogonal logic gating system on the surface. The preparation method includes preparing an oil phase containing copolymers, magnetic nanoparticles, and a volatile porogen; pre-emulsifying and homogenizing the oil phase in an acidic aqueous phase using an SPG membrane; inducing phase separation by controlled solvent evaporation to form porous microspheres; and finally coupling the upconversion nanocrystals via a click chemistry reaction. The magnetic microspheres of this invention eliminate background fluorescence interference from complex samples from a physical perspective. Their porous structure endows the microspheres with excellent quasi-levitation properties and magnetic responsiveness, effectively solving problems such as single surface function and signal crosstalk of microspheres. They are suitable for in vitro clinical diagnosis and complex analysis of multiple targets.

This invention discloses a core-shell structure YTaO4:Er 3+ / Yb 3+ @YTaO4 thermal barrier coated fluorescent temperature probe material and its preparation method. Er is prepared using the Pechini sol-gel method. 3+ Single doping and Er 3+ / Yb 3+ YTaO4 luminescent cores were co-doped, and an inert shell of YTaO4 was constructed using a "coating + low-temperature calcination" process to form a core-shell structure, achieving stable upconversion luminescence performance at high temperatures. The prepared YTaO4:Er 3+ / Yb 3+ @YTaO4 core-shell structured materials combine the high luminescence intensity of the luminescent core with the protective effect of the shell on luminescence stability under high-temperature environments. They exhibit excellent temperature sensing sensitivity at high temperatures, making them suitable for online temperature monitoring and health assessment of intelligent thermal barrier coatings. This core-shell structure design effectively improves the luminescence stability of rare-earth ions, providing a novel solution for high-temperature fluorescent temperature sensing materials.

This invention belongs to the field of rare-earth luminescent materials and optical sensing technology, specifically disclosing an upconversion temperature probe excited by NIR-I, its preparation method, and its application. The probe includes a matrix core material, which is a fluoride crystal; and dopant ions, specifically holmium ions (Ho) doped into the matrix core material. 3+ Ho 3+ As the sole luminescent center, it is excited by a near-infrared I light source with a wavelength of 880-920 nm to generate Ho. 3+ Characteristic green upconversion luminescence and red upconversion luminescence. This invention employs the aforementioned NIR-I excited upconversion temperature probe, its preparation method, and its application, utilizing Ho... 3+ The unique energy level competition mechanism of ions enables high-sensitivity temperature measurement over a wide temperature range, and the temperature measurement signal is unaffected by fluctuations in excitation power.

This invention discloses an X-ray irradiation-induced discoloration tungstate photonic crystal, its preparation method, and its applications, belonging to the fields of porous materials and optical research technology. The chemical formula of the tungstate photonic crystal is PbWO4:2mol%Yb. 3+ 1mol%Er 3+ The tungstate photonic crystal possesses a three-dimensional ordered macroporous inverse opal structure. The tungstate photonic crystal of this invention induces a photochromic effect in the tungstate matrix through X-ray irradiation, enabling information writing; it uses a 980nm laser to excite rare-earth ions to emit upconversion luminescence for information reading; and it can erase information by irradiation with an 808nm laser, restoring the material to its initial state and enabling reuse. This invention achieves multi-dimensional dynamic control of luminescence, combining static structural color anti-counterfeiting with dynamic reversible encryption functions, and has broad application prospects in information storage, X-ray detection, and multi-layered anti-counterfeiting.

This invention discloses a rare-earth-doped perovskite quantum dot / fluoride core-shell heterostructure nanomaterial and its preparation method, relating to the field of nanomaterial preparation technology. This invention uses Yb 3+ Cesium lead halide perovskite serves as the quantum dot core, with a rare-earth-doped active fluoride shell epitaxially grown on its surface, forming a core-shell heterostructure. Furthermore, an undoped inert fluoride shell is epitaxially grown on the surface of the active fluoride shell, constructing a core-shell-shell multilayer heterogeneous nanomaterial. This invention achieves complementary performance advantages between perovskite and fluorides, broadens the material's spectral response range, improves chemical stability and luminescence efficiency, and combines upconversion luminescence and quantum sizing characteristics. It can be widely applied in near-infrared photodetectors, biofluorescent probes, optical anti-counterfeiting, and spectral conversion thin films.

This invention discloses a highly sensitive LCN2 detection kit and its preparation method for assessing the prognostic risk of patients with stress-induced cardiomyopathy. The kit contains a signal probe composed of rare-earth-doped upconversion nanoparticles and an LCN2-specific DNA aptamer, as well as a complementary oligonucleotide quenching probe with a quenching group. Its core principle is based on fluorescence resonance energy transfer regulated by competitive binding: when the target protein LCN2 is absent, the binding of the two probes leads to luminescence quenching; when LCN2 is present, they competitively bind to the aptamer and dissociate the quenching probe, thereby restoring upconversion luminescence. This homogeneous detection method effectively avoids the interference of autofluorescence in biological samples by utilizing near-infrared excitation. Combined with the high stability and specificity of the aptamer, it achieves a simple, rapid, highly specific, and ultra-sensitive quantitative detection of LCN2 protein in serum, providing a reliable tool for clinical prognostic assessment.

The application discloses an up-conversion luminescent material with reverse thermal quenching and thermal quenching, belongs to the field of rare earth luminescent materials, and has a chemical formula of NaEr 0.695 F4:Yb 0.2 / Gd 0.1 / Eu 0.005 The material morphology is a micron-level hexagonal disc, and the NaEr 0.695 F4:Yb 0.2 / Gd 0.1 / Eu 0.005 The up-conversion micro-particle is used as a dual-function up-conversion luminescent temperature sensor, and can be used for a sensitized sensor and a thermal quenching sensor, and can also be used for non-contact optical temperature measurement or high-sensitivity optical temperature measurement under extreme temperature conditions. Temperature detection is realized based on thermal coupling energy levels, the distance between two emission peaks is large, and data processing errors are greatly reduced; the up-conversion luminescent intensity of the energy level is enhanced with the increase of temperature, which is called reverse thermal quenching, and the temperature sensing performance is better. The application further discloses a preparation method of the material, and the method is simple to operate, the material has good crystal phase, uniform phase, high yield and stable performance, and has good dual-function temperature response effect.

A tungstate powder probe based on fluorescence intensity ratio, a portable temperature detection system, and their fabrication method are disclosed, belonging to the field of optical luminescent materials technology. The material uses high-purity Y₂O₃, ZnO, WO₃, and K₂CO₃ as a matrix, doped with Er₂O₃ and Yb₂O₃. The preparation method involves adding anhydrous ethanol to a certain proportion of the raw materials, thoroughly grinding and pressing them into tablets, sintering at high temperature, and then grinding them into powder. The temperature sensing system is fabricated by coupling the prepared powder to one end of a multimode optical fiber as a temperature probe. The other end is connected to a portable spectrometer and a small light source, respectively, and a microcontroller processes the electronic signal returned by the spectrometer. The resulting material exhibits extremely high upconversion luminescence efficiency, strong anti-interference ability, and can be used in harsh environments such as high temperature, high electromagnetic interference, and strong corrosion. Furthermore, since the detection is based on relative light intensity changes, the influence of light source power fluctuations on the measurement results is eliminated. The portable temperature detection system also has advantages such as high response speed, high accuracy, and ease of carrying and use.

This invention relates to the field of luminescent materials technology, specifically a Ho 3+ A method for preparing Cs₂NaYbCl₆ microcrystals and their application in anti-counterfeiting and temperature sensors. The preparation method includes: Step 1, according to the stoichiometric ratio of Cs₂NaYbCl₆... x Ho y Weigh the raw materials CsCl, NaCl, YbCl3·6H2O, and HoCl3·6H2O, where x + y = 1, and x ∈ (0, 1), y ∈ (0, 1); Step 2, add the above raw materials to deionized water and stir to dissolve to obtain a clear solution; Step 3, dry the clear solution until the solution evaporates and white crystals precipitate; Step 4, grind the white crystals to obtain HoCl3·6H2O. 3+ This invention relates to the preparation of high-purity, high-performance Cs₂NaYbCl₆:Ho microcrystals via a simple dissolution-drying method. 3+ Microcrystals enable multi-color tunable upconversion luminescence, and an optical anti-counterfeiting / information encryption system and a high-sensitivity temperature sensing system based on this material are constructed.

This invention provides a frame-type upconversion infrared visualization glasses, its fabrication method, and its applications, relating to the fields of infrared visualization materials and wearable optical devices. The optical lens of the glasses comprises, from the incident side to the wearer side, an infrared anti-reflection layer, an upconversion core-shell luminescent layer, a visible light gain layer, an infrared reflective layer, and a protective eye layer. This invention uses mesoporous SiO2 nanospheres as the core to construct the upconversion core-shell luminescent layer, and combines it with the infrared anti-reflection layer, visible light gain layer, infrared reflective layer, and protective eye layer to form a five-layer optical enhancement structure. This structure is integrated into the frame lens using a layer-by-layer injection molding and graded curing process, achieving multiple recycling of near-infrared light, efficient loading of rare-earth luminescent components, a significant improvement in upconversion luminescence efficiency, and a synergistic enhancement of visible light output brightness and uniformity on the wearer side. It has broad application prospects in the field of visual assistance for patients with retinitis pigmentosa and late-stage glaucoma.

This invention discloses a (YbEr)Ta7O 19 Green upconversion luminescent material and its preparation method, the preparation method includes the following steps: according to the molar ratio of Yb 3+ Er 3+ Ta 5+ =a:b:c Weigh out raw materials Yb₂O₃, Er₂O₃, and Ta₂O₅, and mix them. Grind the mixed raw materials in a mortar and pestle, then add 1 to 15 times the mass of B₂O₃ and mix it with the raw materials. Heat the mixture at 900-1100 °C. o Sinter at C for 12-60 h; immerse the sintered sample in water for several days, then filter, and finally place it in an oven at 80°C. o Dry at C for 2 hours; then acid-wash the dried sample, followed by filtration and drying to obtain the green upconversion luminescent material (YbEr)Ta7O. 19 The present invention discloses a (YbEr)Ta7O 19 Green upconversion luminescent material, (Yb / Er)Ta7O prepared using B2O3 as solvent. 19 The phosphor, when excited by a 980nm laser, exhibits pure green upconversion fluorescence, with an integrated fluorescence intensity reaching that of NaYF4:Er 3+ / Yb 3+ It is 2.44 times more potent than upconversion phosphors, and the luminescent material oxide prepared by this invention has high chemical stability, and is expected to replace fluorides in optical wavelength conversion applications in the future.

This invention provides a fluoride upconversion luminescent thin film, its preparation method, and its application. The preparation method includes: (1) mixing a Na source, an F source, and a first solvent to obtain a first solution; (2) mixing at least three rare earth metal sources and a second solvent to obtain a second solution; (3) sequentially coating the first solution and the second solution onto a substrate, and obtaining the fluoride luminescent thin film after reaction. The first solvent and the second solvent each independently include methanol, and the at least three rare earth metal sources include rare earth nitrates. This invention directly prepares a fluoride upconversion luminescent thin film by in-situ integral growth on a substrate. The resulting film is uniform, dense, and has strong luminescence intensity. The operation is simple, the preparation time is short, and it is suitable for widespread application.

This invention discloses a method for regulating β-amyloid protein aggregation based on circularly polarized light and its application. The method includes electrostatically binding an amino-modified upconversion luminescent nanoparticle to a SiO2-coated chiral optically active nanostructure to obtain an upconversion chiral nanomaterial; coating the surface of the upconversion chiral nanomaterial with a biocompatible coating and a brain-targeting ligand, then mixing it with β-amyloid protein, and targeting the region with 5–100 mW / cm² light. 2 Irradiation with an 800–1400 nm laser for 15–30 min excites upconversion chiral nanomaterials to emit circularly polarized light. This circularly polarized light inhibits the aggregation of β-amyloid protein by interfering with the formation of its β-sheet conformation. This invention utilizes circularly polarized light (CPL) to induce changes in key protein site interactions, thereby altering the conformation of protein aggregation. This process is reversible and highly spatially selective. Animal experiments have verified that this method can effectively block Aβ aggregation and improve cognitive function.