115 results about "Light excitation" patented technology

This invention discloses a method for detecting polycyclic aromatic hydrocarbons (PAHs) based on ultraviolet fluorescence and absorption spectroscopy, comprising: Step 1, acquiring the ultraviolet absorption spectrum and the fluorescence emission spectrum of a water sample under ultraviolet light excitation; Step 2, analyzing the corresponding CDOM fluorescence spectrum using the ultraviolet absorption spectrum obtained in Step 1; Step 3, subtracting the CDOM fluorescence spectrum obtained in Step 2 from the fluorescence emission spectrum obtained in Step 1 to obtain a mixed fluorescence spectrum containing multiple PAHs; Step 4, performing multivariate fitting on the mixed fluorescence spectrum obtained in Step 3 to obtain the type and concentration of each PAH in the water sample. This invention also provides a PAH detection device. The method provided by this invention is simple to operate and can directly detect raw water samples, thereby obtaining more accurate PAH detection results.

This invention discloses a near-infrared long-afterglow nanocomposite, its preparation, and its application in uric acid detection, belonging to the technical field of testing or analyzing materials by measuring their chemical or physical properties. The nanocomposite comprises a near-infrared long-afterglow luminescent center and an outer layer of organosilicon-doped mesoporous silicon containing tetrasulfide bonds. Under near-infrared light excitation, this nanocomposite exhibits excellent afterglow luminescence enhancement response to hydrogen peroxide. Since the product of uric acid decomposition by uricase is hydrogen peroxide, this composite enables highly sensitive and rapid detection of uric acid in blood. The composite provided by this invention has uniform particle size and high stability, effectively eliminating autofluorescence interference from biological components and improving detection accuracy.

The application discloses a near-infrared fluorescent powder and a light-emitting device. The near-infrared fluorescent powder comprises a composition formula LiA a Sc 1‑a‑p‑d‑ c D d P p An inorganic compound of EO4:cCr, wherein A elements include one or two of Li, Na and K, D elements include two of Ga, In, Al, Ce and Bi, and E elements include two or three of Hf, Ge and Si; wherein 0

The invention discloses an NCS-doped manganese-based organic-inorganic hybrid metal halide luminescent material and a preparation method thereof, and belongs to the field of photoelectric materials. The chemical formula of the manganese-based organic-inorganic hybrid metal halide is (C12H28N) 2MnBr4: NCS-, and the manganese-based organic-inorganic hybrid metal halide can emit broadband bright yellow light with the central wavelength of 552 nm under the excitation of ultraviolet light. In addition, the preparation method of the luminescent material is simple and easy to operate, raw materials are cheap and easy to obtain, and the luminescent material is suitable for large-scale production. The luminescent material can be used in the fields of solid-state illumination, display and the like.

The application relates to a method for visible light catalytic synthesis of organic compounds based on low-toxicity ZnSe@ZnS core-shell quantum dots. ZnSe@ZnS quantum dots are used as a sensitizer, the surface of the quantum dots is chelated with 4-benzoylbenzoic acid (BP), N,N-diisopropylethylamine (DIPEA) molecules are added to the solution as an electron sacrificial reagent and a substrate organic molecule to construct a quantum dot sensitized electron reduction system. The photocatalytic reduction product can be obtained under 405nm visible light excitation. In the system, the electron transfer and transmission process is studied through a transient absorption spectrum.

This invention relates to the fields of optical fiber communication and microwave photonics. Existing tunable dual-passband microwave photonic filters suffer from poor passband stability and cannot meet practical application requirements. This invention provides a narrow-band tunable dual-passband microwave photonic filter using a Brillouin fiber laser. It generates dual-tone pump light to excite the Brillouin using a tunable laser source and an intensity modulator. Combined with a Brillouin fiber oscillator and a cascaded Fabry-Perot cavity, the Brillouin gain spectrum is narrowed to the kHz level. Simultaneously, the different periodic resonant frequencies of the two ring cavities effectively suppress side modes, filtering out the desired frequency band signal. Furthermore, by synchronously tuning the center frequencies of the two passbands of the filter by changing the pump light wavelength, and simultaneously controlling the output frequency of the signal generator, the frequency interval between the two passbands is changed, ultimately realizing a narrow-linewidth tunable dual-passband microwave photonic filter.

The application relates to the technical field of quantum sensing and smart grid monitoring, in particular to a current detection method and device integrating sensing and communication and a current detection system; the method is applied to a control module in a current detection system, and the method comprises the following steps: in response to triggering of a sensing mode, a light excitation and detection module is controlled to apply excitation laser to an NV color center probe, and an antenna module is controlled to apply a microwave signal to the NV color center probe; a fluorescence intensity signal is acquired; according to the fluorescence intensity signal, the frequency of the microwave signal and the positional relationship between the NV color center probe and a to-be-detected transmission line, an induced magnetic field signal of an environmental magnetic field is determined, and a target current value in the to-be-detected transmission line is determined according to the induced magnetic field signal; in response to triggering of a communication mode, detection information containing the target current value is generated, and the antenna module is controlled to send the detection information. The scheme of the application can reduce the power consumption of the system.

The application relates to a high-heat-resistance red light-emitting material and a preparation method and application thereof, and the chemical general formula of the material is CaLaTiTaO7: x Eu 3+ , and 0 < x <= 0.8; the material is synthesized by a high-temperature solid-phase method, CaCO3, La2O3, TiO2, Ta2O5 and Eu2O3 are weighed according to the stoichiometric ratio, are ground and are calcined, the sintered product is cooled and is finely ground to obtain the material; the CaLaTiTaO7 material is first selected as a matrix to synthesize a CaLaTiTaO7: x Eu 3+ series red fluorescent powder, under 393 nm near-ultraviolet light excitation, the material presents characteristic red light emission of Eu 3+ ions at 613 nm. The CLTT:0.6Eu 3+ / PDMS flexible composite thin film constructed by the material can maintain structural integrity and light emission stability in an acid-base environment, and an LED device prepared by using the material has good white light emission characteristics.

The application discloses a kind of strong electron donor triphenylamine modified coumarin dyes, its synthesis method and application;The dye has blue-green light excitation characteristics, the maximum absorption wavelength is 415-425 nm, the maximum emission wavelength is 495-505 nm, and excellent lysosome targeting and positioning ability is shown.It overcomes the problem of low efficiency of traditional coumarin as photosensitizer in molecular structure design, realizes the efficient I type photodynamic effect, can generate active oxygen under light efficiently.In addition, this dye has good cell membrane permeability and low dark toxicity, suitable for biomedical imaging, photodynamic therapy of tumor and other fields.The synthesis method is simple, raw materials are easy to obtain, and the yield is high, suitable for large-scale production.Experiments show that the dye can effectively enrich in cell lysosomes, realize precise killing of cancer cells, and show great potential in cancer diagnosis and treatment integration.

The present invention provides an integrated platform for exciting a molecular fluorescence signal, a detection chip, and an optical packaging structure. The integrated platform for exciting the molecular fluorescence signal comprises, arranged in sequence: an input optical coupling structure (1), a first filtering structure (2), an optical beam-splitter tree structure (3), a filtering structure array (4), a fluorescence excitation structure array (5), and an optical coupling-out structure array (6). The detection chip is used for detecting molecular fluorescence and comprises, arranged from bottom to top in sequence: a fluorescence detection layer (103'), a fluorescence collection layer (102'), and a fluorescence excitation layer (101'). The fluorescence excitation layer (101') comprises, arranged in sequence: an input optical coupling structure (1011'), an optical beam-splitter tree structure (1013'), a fluorescence excitation structure array (1014'), and an optical coupling-out structure array (1015'). The fluorescence excitation layer is further provided with an optical feedback structure (1012'), wherein an input end of the optical feedback structure (1012') is connected to a first output end of one branch of the optical beam-splitter tree structure (1013'). The optical packaging structure comprises an optical fiber module (2') and the detection chip (1'). The integrated platform in the present invention incorporates on-chip filters, providing an integrated fluorescence excitation solution capable of suppressing broadband background light arising from spontaneous fluorescence of lasers or waveguides, thereby improving a signal-to-noise ratio. The detection chip and the optical fiber module in the optical packaging structure in the present invention employ a passive optical coupling scheme, thereby facilitating stability of fluorescence signals and reducing complexity of external device optical paths.

This invention discloses a biomedical near-infrared luminescent material with a fluorite structure and its preparation method. Its chemical composition is given by [formula omitted], where 0 < x ≤ 0.1, preferably 0.001 ≤ x ≤ 0.05. This material belongs to a cubic fluorite structure, exhibiting not only excellent chemical stability but also superior biocompatibility due to its crystal structure characteristics. The luminescent material is prepared using a high-temperature solid-state method, with an excitation wavelength range covering 300-700 nm and multiple excitation peaks. It can be excited by blue, green, or red light, achieving far-red to near-infrared light emission in the wavelength range of 600-1100 nm. This material can be combined with visible light LED chips to fabricate near-infrared luminescent devices, possessing significant application value in fields such as bioimaging, tissue sensing, and non-invasive physiological detection. The preparation process of this invention is simple, the raw material cost is low, and it is suitable for large-scale production, demonstrating promising prospects for widespread application.

This disclosure provides a method for detecting an analyte in a sample, wherein the sample is introduced into an analytical chamber along with emulsion droplets or gel beads. In another aspect, this disclosure provides designs for formulating emulsion droplets or gel beads such that they can be used for the large-scale parallel detection of analytes. Formulations containing specific combinations of fluorescent particles allow for the optical determination of the identity of each fluorescent particle. These combinations are based on the particle fluorescence emission wavelength, fluorescence excitation wavelength, and particle count.

Integrated target waveguide devices and optical analytical systems comprising such devices are provided. The target devices include an optical coupler that is optically coupled to an integrated waveguide and that is configured to receive optical input from an optical source through free space, particularly through a low numerical aperture interface. The devices and systems are useful in the analysis of highly multiplexed optical reactions in large numbers at high densities, including biochemical reactions, such as nucleic acid sequencing reactions. The devices provide for the efficient and reliable coupling of optical excitation energy from an optical source to the optical reactions. Optical signals emitted from the reactions can thus be measured with high sensitivity and discrimination. The devices and systems are well suited for miniaturization and high throughput.

This invention relates to a liquid crystal elastomer (CLCE) anti-counterfeiting label with information patterns, belonging to the fields of anti-counterfeiting technology and information security technology. It achieves multiple anti-counterfeiting effects through the following characteristics: the CLCE on the label surface reflects light of different wavelengths at different angles, i.e., the color appears different depending on the viewing angle; pressing or slightly stretching the label reveals a distinct dynamic rainbow color; under ultraviolet (UV) light excitation, the front and back of the anti-counterfeiting label display differentiated patterns—the front displays a clear fluorescent pattern and the label simultaneously emits green phosphorescence, while the back displays a unique identification pattern completely different from the front; when a left-handed polarizer is superimposed, the pattern contrast is significantly enhanced, further improving visual clarity; when a right-handed polarizer is superimposed, the pattern completely disappears, achieving an invisible effect; furthermore, after UV light excitation and the light source is turned off, the label can achieve continuous afterglow emission for a long time, thus providing an additional, time-based anti-counterfeiting verification method.

This invention discloses a two-dimensional hydrogen germanene nanosheet, its preparation method, and its applications. The two-dimensional hydrogen germanene nanosheet has an ultrathin layered structure, with covalently modified hydrogen atoms on its surface, a lateral dimension of 100–300 nm, and a thickness of 5–10 nm. When activated by a specific wavelength laser, the two-dimensional hydrogen germanene nanosheet can photoexcite and generate singlet oxygen to destroy bacterial biofilms and kill bacteria. Simultaneously, it consumes local oxygen to create a staged hypoxic microenvironment, thereby inhibiting excessive inflammatory responses. After the light exposure ends, as the local oxygen level naturally recovers, it can further enhance the infection clearance function of immune cells, achieving continuous clearance of residual infection. This invention, through staged dynamic regulation of oxygen partial pressure, synergistically integrates direct bactericidal and immune clearance processes, ensuring antibacterial strength while reducing the risk of tissue damage and infection recurrence. It is suitable for the safe and effective treatment of implant-related biofilm infections.

The application relates to an indium-zinc-gallium-oxygen-based near-infrared long-afterglow nanomaterial, a preparation method and application thereof, wherein the preparation method comprises the following steps: taking indium salt, zinc salt, gallium salt, chromium salt and ytterbium salt according to a stoichiometric ratio, dissolving the salts, adding a precipitant and a surfactant to obtain a precursor mixed solution; performing hydrothermal synthesis on the precursor mixed solution to obtain a precursor powder; and performing calcination on the precursor powder to obtain the near-infrared long-afterglow nanomaterial. The near-infrared long-afterglow nanomaterial is prepared by adopting a hydrothermal method combined with a low-temperature calcination process and by optimizing a doping ion concentration, can emit a near-infrared long-afterglow under the excitation of ultraviolet light 254 nm, has excellent afterglow performance, has a remarkable effect in mouse imaging, and has a wide application prospect in the field of biomedical imaging.

The invention relates to an NMR-DNP probe comprising a sample holder, a temperature control device, a microwave guide and an illumination device, characterized in that the temperature control device comprises a VT channel through which a temperature control fluid can be supplied to the sample container for temperature control of the sample substance in NMR measurement mode, a sample-side end of the light guide is arranged in the VT channel, and a deflection mirror is arranged in the VT channel between the sample-side end of the light guide and the sample container, which directs the light exiting the light guide onto the sample substance in the sample volume of the sample container. This allows additional light excitation with adjustable beam width to illuminate the NMR test sample within the probe without negatively affecting the magnetic field or RF. Furthermore, optical excitation in the UV range can also be realized. The optical fiber is integrated into the probe with a very small bending radius. The invention also relates to a bearing bushing for use in an NMR-MAS probe and to an NMR spectrometer.

This invention relates to the field of functional engineered wood products, specifically to an engineered wood product with ultra-long room-temperature phosphorescence characteristics. The engineered wood product includes bonded units and an adhesive layer located between adjacent bonded units. The adhesive layer is formed by an adhesive that, upon curing, can generate room-temperature phosphorescence. Under external light excitation, the adhesive layer can generate ultra-long room-temperature phosphorescence emission, and the emission signal includes at least one of the following: emission color, emission intensity, emission spectrum, delayed emission image, and / or phosphorescence lifetime. The bonded units are selected from at least one of the following: decorative paper, thin wood veneer, engineered wood veneer, wood veneer, wood / bamboo strips, wood / bamboo shavings, wood / bamboo fiber, straw, and biomass fragments. By adjusting the adhesive system, interface structure, and hot-pressing process parameters, the resulting engineered wood product can exhibit different room-temperature phosphorescence characteristics. This invention endows the board with stable room-temperature phosphorescence function without changing the basic manufacturing process of existing engineered wood products, possessing good process compatibility and application prospects. The room-temperature phosphorescence signal can construct material-level optical coding information, realizing the identification and anti-counterfeiting traceability of the engineered wood product.

This invention discloses a photocuring process visualization ink composition, comprising a photocrosslinkable precursor component, a photoinitiator component, and a free radical indicator. During photocuring, the free radical indicator reacts with free radicals generated by the photoinitiator under photoexcitation, changing from one color state to another. The light absorption peak of the free radical indicator is spectrally separated from the excitation wavelength of the photoinitiator. This invention also discloses a method for visualizing the photocuring process using the above composition and an additive manufacturing process with visualization monitoring capabilities. The method described in this invention is compatible with most photocuring systems based on free radical polymerization mechanisms, and the monitoring process is applicable to various photo-based 3D printing technologies such as volumetric additive manufacturing, digital light processing, and stereolithography, providing a material and methodological basis for process visualization and closed-loop control in bio-3D printing.

The application provides a red light excitable photoelectric response heterostructure nanotube, a hydrogel and a preparation method and application thereof, and belongs to the technical field of nanomaterials. By integrating a heterostructure, a quantum confinement effect and morphological modification, a one-dimensional TiO2 / Bi2S3 quantum dot nanotube with visible red light excitation and high photoelectric conversion efficiency is prepared, which is combined with a hydrogel precursor to simulate an extracellular matrix, so that a high-performance red light response photoelectric hydrogel dressing is developed. The hydrogel dressing has excellent ability in promoting nerve ending reinnervation, promoting skin substructure repair and regulating immune response in a deep burn model, and has wide application prospects in overall skin repair.

The application discloses a kind of LED modulation bandwidth fast test system, including direct-current power supply;Biaser;Laser, for exciting LED sample to emit light, realize the transformation of optical signal-electrical signal-optical signal;Transmission component, for focusing overall light;Optical filter, for excluding the influence of laser on LED light emission;Photoelectric detector, detect the light signal emitted by LED, and change into electrical signal output;Vector network analyzer, analyze two-port signal to draw frequency response curve, so as to obtain the modulation bandwidth of LED.The application can realize the function of testing the communication performance of LED without packaging, and can realize the function of measuring the modulation bandwidth of multiple LEDs simultaneously by laser scanning.Using the device of the application can realize fast measurement, and optical excitation can achieve the effect of zero damage to LED sample.

A brain measuring apparatus (M1) has a magnetoencephalograph having light-excited magnetic sensors (1A), magnetic sensors (2) measuring a static magnetic field of positions of the light-excited magnetic sensors (1A), and a correction coil (16) for correcting the static magnetic field, an MRI apparatus having a permanent magnet for applying a static magnetic field, a gradient magnetic field coil (8) for applying a gradient magnetic field, a transmission coil (21) for transmitting a transmission pulse, and a reception coil (22) for detecting a nuclear magnetic resonance signal produced by transmission of the transmission pulse, and a control apparatus (5) which, at the time of measurement of a magnetoencephalograph, controls a current supplied to the correction coil (16) based on a measurement value of the magnetic sensors (2) so as to cancel a static magnetic field related to the geomagnetism of each position of the light-excited magnetic sensors (1A) and a static magnetic field applied by the permanent magnet, and, at the time of measurement of an MR image, controls a current supplied to the gradient magnetic field coil (8) and the gradient magnetic field, and generates an MR image based on an output of the reception coil (22).

This invention relates to a Cr 3+ Doped oxide phosphors, their preparation methods and applications, wherein the Cr 3+ The structural formula of the doped oxide phosphor is AB 1‑x Cr x W₂O₈, wherein A comprises any one or a combination of at least two of Li, Na, K, Rb, or Cs; B comprises any one or a combination of at least two of Sc, Y, Ga, or Gd; 0.01 ≤ x ≤ 0.18. The Cr of this invention... 3+ Doped oxide phosphors, single-doped Cr 3+ When excited by green or red light, near-infrared emission is achieved, with an emission peak around 1060 nm, covering the deep red region to the near-infrared II region, making it an ultra-wideband near-infrared oxide phosphor; by exciting the phosphor with a matched LED, a near-infrared light emitting device can be obtained.

The present disclosure provides a light-emitting device and a manufacturing method thereof, a taillight and a vehicle. The light-emitting device includes at least one light-emitting element located on one side of a backplane, wherein a wavelength of a first light emitted by each light-emitting element is 500 nm to 580 nm; a wavelength conversion layer located on one side of the at least one light-emitting element away from the backplane and configured to emit a second light with a different color from the first light under the excitation of the first light; and a first optical structure located on one side of the wavelength conversion layer away from the backplane, and including one or more optical elements, each of which is configured to focus the second light along a direction perpendicular to the backplane.

Provided is a highly reliable semiconductor light-emitting device that suppresses the deterioration of a phosphor. The semiconductor light-emitting device includes a lead frame, a semiconductor light-emitting element, a framing body, and a phosphor portion. The lead frame includes a first electrode body having an element mounting surface and a second electrode body arranged separately from the first electrode body. The semiconductor light-emitting element is arranged on the element mounting surface of the first electrode body. The framing body is formed over surfaces of the first electrode body and the second electrode body. The framing body forms a recess together with the element mounting surface and a surface of the second electrode body. The phosphor portion fills the recess to cover the semiconductor light-emitting element. The phosphor portion is made of a first resin material containing a first phosphor excited by light emitted from the semiconductor light-emitting element to produce fluorescence. The first phosphor is a KSF phosphor. The first resin material is a phenyl-based silicone resin.

A kind of fluorescence imaging system, fluorescence imaging direction and gene sequencer, fluorescence imaging system includes light source, first dichroic mirror, second dichroic mirror, third dichroic mirror, first light detector and second light detector, first dichroic mirror is used to transmit first laser and reflect second laser, and for transmitting first fluorescence and reflecting second fluorescence.Due to the first laser and second laser are divided into two laser for excitation, the fluorescence generated by the first laser and second laser excitation can also be collected in two ways, four light paths can be combined and split, can adopt one or more single-pass single-reflection dichroic mirror combination to form excitation light path and imaging light path, the film layer in single-pass single-reflection dichroic mirror only needs to be set as two structures, so that the structure of single-pass single-reflection dichroic mirror is relatively simple, easy to generate manufacturing, can reduce the cost of imaging system, and using single-pass single-reflection dichroic mirror can also simplify light path.

The application discloses a multi-waveband light-emitting perovskite afterglow material and a preparation method thereof. The material is a matrix material, and an expression formula is ABa-xBaxI3-yCIy, wherein a value range of x is 0.5-0.7, and a value range of y is 0.05-0.4. The material has not only good cyan fluorescence and cyan afterglow, but also near-infrared fluorescence characteristics. The application can be applied to manufacturing a new type of light-emitting diode, which emits cyan fluorescence after being excited by specific light in a visible light wave band, exhibits cyan afterglow under specific conditions, and emits near-infrared light after being excited by specific light in a near-infrared light wave band. In the emergency lighting field, the application can be used to design an emergency sign with high visibility, soft light emission and long duration. In the security anti-counterfeiting field, the application can be used to design an anti-counterfeiting sign with high security and difficult to counterfeit.

This invention relates to a method for identifying ramie fibers and their mixed fibers based on long-lifetime room-temperature phosphorescence. The method establishes luminescence characteristic information for a lyocell fiber control sample, a ramie fiber control sample treated with a 15% NaOH solution, and a mixed fiber control sample of the two. The method acquires the fiber sample to be tested and prepares it as a test sample. The photoluminescence emission spectrum of the test sample is acquired under 365 nm excitation conditions to obtain emission peak position information. After UV excitation stops, the long-lifetime room-temperature phosphorescence decay information of the test sample is acquired to obtain lifetime information. The emission peak position information and lifetime information are compared with the corresponding information of the control sample to identify whether the fiber sample to be tested is ramie fiber or a mixture of lyocell and ramie fibers. This invention utilizes the differences in photoluminescence and long-lifetime room-temperature phosphorescence caused by changes in the crystal structure of ramie fibers for identification, providing an auxiliary detection method based on luminescence characteristics for fiber composition identification.

This invention discloses a class of afterglow molecules, their preparation method, and applications, belonging to the field of biomedical optical imaging materials. By performing a Knoevenagel reaction between compound 2 (4-substituted-2,6-dicarboxyphenol) and N-substituted-2-methylbenzothiazolium bromide, inactive self-sustaining afterglow molecules QCAs are obtained. QCAs integrate reactive oxygen species generation, high-energy intermediate formation, and luminescence functions, possessing advantages such as simplified structure, low energy dissipation, and high reliability. Furthermore, an activatable self-sustaining afterglow molecule, P-QCA5, is also proposed. P-QCA5, modified with a phenylboronic acid group, can specifically respond to ONOO. ‑ It also activates the afterglow signal; leveraging its inherent low background and high signal-to-noise ratio, it successfully achieved precise imaging of mouse tumor models and Parkinson's disease (PD) models. Compared to traditional fluorescence imaging, which requires real-time excitation, afterglow imaging does not require real-time external light excitation, thus avoiding interference from tissue autofluorescence. It has a higher signal-to-noise ratio and deeper tissue detection depth, making it a promising bioimaging optical probe.

The application discloses an electromagnetic wave non-reciprocal transmission structure based on light-excited graphene and a transmission method thereof. The structure is composed of silicon rods with different widths placed on a silicon / silicon dioxide substrate, and large-area CVD graphene is transferred to the structure to form a graphene super surface structure. Due to the asymmetry of the structure and the excitation of the nonlinear Kerr effect, the transmission efficiency of electromagnetic waves is significantly related to the incident direction of signal light. By optimizing the structure parameters, the light-excited graphene super surface structure based on the light-excited graphene super surface structure shows a large positive and negative transmission ratio. The device structure is simple and compact, the required incident laser intensity is only 80kW / cm 2 , and is relatively easy to realize in experiments. By utilizing the optical adjustable function of graphene, the working frequency band of the non-reciprocal device can be effectively controlled, thereby flexibly realizing the optical isolation function.