36 results about "Stokes shift" patented technology

The application provides a semiconductor laser element with a topological phonon state layer, comprising, from bottom to top, a substrate, a lower limiting layer, a lower waveguide layer, an active layer, an upper waveguide layer and an upper limiting layer. The application is characterized in that a topological phonon state layer with a multilayer structure is arranged between the lower waveguide layer and the lower limiting layer of the semiconductor laser element, and the saturation electron drift velocity distribution characteristics, the electron affinity energy distribution characteristics and the polarized optical phonon energy distribution characteristics of each layer of the topological phonon state layer are designed, so that the topological quantum state and the topological phase change of the phonon spectrum can be adjusted, the quantum state and the lattice vibration mode can be changed, the Stokes shift loss of the difference between the photon energy of the pump light and the oscillation light can be reduced, and the thermal stress and the temperature quenching problem of the laser can be inhibited.

The application discloses a beta-galactosidase near-infrared fluorescent probe with a large stokes shift and a preparation method and application thereof. The structure of CPD-gal is shown in formula I. When a 580nm excitation wavelength is used for excitation, CPD-gal has weak fluorescence at 713nm, but can selectively undergo a fluorescence opening reaction with beta-gal. With the increase of the concentration of beta-gal, the fluorescence intensity at 713nm is gradually enhanced, and other interfering ions and species will not interfere with the detection of beta-gal by CPD-gal. Since the emission wavelength is in the near-infrared region and a large stokes shift is generated, the system background fluorescence interference is greatly reduced, and the sensitivity of the detection of beta-gal is improved. Therefore, CPD-gal is suitable for the fluorescence detection of beta-gal with high selectivity and high sensitivity. The probe is successfully applied to the fluorescence imaging of endogenous beta-gal in HeLa cells and SK-OV-3 cells.

The invention belongs to the technical field of photosensitive materials, and particularly relates to an aggregation-induced emission type photosensitizer as well as a preparation method and application thereof. The aggregation-induced emission type photosensitizer provided by the invention has a structure as shown in any one of formulas I-III. The aggregation-induced emission (AIE) photosensitizer has large Stokes shift, can emit light in a near infrared region I (NIR-I), and is beneficial to penetrating deep biological tissues and reducing light damage to the biological tissues; meanwhile, the AIE type photosensitizer has relatively strong I type active oxygen generation capability, and is expected to be used as a photosensitizer for photodynamic therapy. Formula I, Formula II and Formula III.

The invention relates to the field of fluorescent dyes, in particular to a near-infrared fluorescent dye for brain imaging as well as a preparation method and application of the near-infrared fluorescent dye. The near-infrared fluorescent dye for brain imaging has the advantages of novel structure, good biocompatibility, large Stokes shift, high light stability, high fluorescence signal-to-noise ratio and the like; the near-infrared fluorescent dye prepared by the invention is simple in preparation process, mild in reaction condition, short in synthesis path and beneficial to industrial production, and has a wide application prospect.

The application belongs to the technical field of organic electroluminescence, and relates to a N-containing polycyclic aromatic compound and application. The application provides a N-containing polycyclic aromatic compound, which generates a multiple resonance effect through interaction of each N atom in a N-containing fused ring. The multiple resonance effect can reduce the Stokes shift of the molecule, narrow the emission spectrum, and increase the rate of intersystem crossing inversion, so that a high-efficiency, high-color-purity luminescent material is obtained.

The application discloses an aggregation-induced emission material with high fluorescence quantum yield and large stokes shift, a preparation method and application thereof, and belongs to the technical field of preparation of the aggregation-induced emission material. The preparation method comprises the following steps: obtaining an intermediate by means of Suzuki-Miyaura coupling reaction of an organic boric acid and bromosalicylaldehyde; and adding the intermediate, sodium metabisulfite and aminophenylthiophenol into an organic solvent, and then performing high-temperature reaction to prepare the aggregation-induced emission material. The aggregation-induced emission material is synthesized by means of a two-step method, can be rapidly and mass-produced, and has the advantages of high fluorescence efficiency, large stokes shift, good stability and the like.

The invention provides a hypochlorous acid fluorescent probe with large Stokes shift and a preparation method and application thereof, and belongs to the technical field of hypochlorous acid fluorescent probes, the hypochlorous acid fluorescent probe is a cationic iridium (III) complex and contains antianions; the Stokes shift of the hypochlorous acid fluorescent probe is larger than or equal to 170 nm, background interference caused by overlapping of exciting light and an emission spectrum is reduced, and the detection signal-to-noise ratio is increased; the hypochlorous acid fluorescent probe disclosed by the invention has the characteristic of quick response to HOCl, and shows relatively high detection sensitivity and excellent selectivity; the hypochlorous acid fluorescent probe can trigger detectable fluorescence signal change after acting with HOCl in cells, so as to realize in-situ detection and imaging of HOCl in cells; the fluorescent probe can be applied to a lambda-carrageenan induced mouse arthritis model, in-vivo fluorescence imaging of endogenous HOCl signals in an inflammation joint area is achieved, and a sensitive and reliable imaging tool is provided for research of inflammation-related disease related HOCl.

This invention discloses a fluorescent probe that simultaneously distinguishes between hydrogen peroxide and glutathione. The chemical structure of the probe is as follows: This fluorescent probe ingeniously combines a 1,8-naphthalenedimide fluorophore and an isophorone fluorophore, achieving for the first time a dual-channel simultaneous detection of hydrogen peroxide and glutathione. When reacting with glutathione, it emits 500 nm green fluorescence at an excitation wavelength of 380 nm; when reacting with hydrogen peroxide, it emits 680 nm near-infrared fluorescence at an excitation wavelength of 560 nm. The two emissions differ by 180 nm, and the spectra do not interfere with each other, allowing for the selective simultaneous detection of hydrogen peroxide and glutathione. This probe exhibits excellent selectivity for detecting hydrogen peroxide and glutathione, high fluorescence quantum yield, and a large Stokes shift, showing great promise for applications in analytical chemistry, life sciences, and biomedicine.

The application discloses a curcuminoid xanthene compound shown in formula I, a preparation method of the curcuminoid xanthene compound and application of the curcuminoid xanthene compound as a photodiagnosis and treatment agent. The compound has the characteristics of long absorption and emission wavelength, good stability, high phototoxicity, large Stokes shift, good biocompatibility and good cell membrane permeability. Compared with curcumin, the photosensitizer has a longer absorption wavelength, lower dark toxicity and can generate ROS under type-I and type-II synergistic action, and is expected to be applied to PDT in an anaerobic tumor microenvironment.

A method of synthesizing carbon quantum dots (CQDs) includes using a dried ground Halodule uninervis seagrass to form a suspension in water, followed by centrifuging and filtering through a filter membrane and a dialysis membrane to form a CQDs solution. The CQDs have a Stokes shift of less than 83.0 nm at an excitation wavelength of 380 to 430 nm.

The invention discloses a preparation method and application of a transition metal ion doped CdSe / ZnS core-shell quantum dot, according to the method, transition metal ions are controllably introduced into a host CdSe / ZnS material forbidden band as a magazine energy level so as to create a new electron energy level, and meanwhile, the number of defect energy levels of the CdSe core quantum dot is remarkably reduced; and a light-emitting mechanism is successfully converted from band-edge exciton recombination to non-radiative transition recombination. And the dependence of the luminescence performance on the physical size of the quantum dot is eliminated. Due to the characteristic, the material has the excellent temperature response characteristic: the material has wide-spectrum and tunable luminescence, huge Stokes shift to eliminate self-absorption, excellent light stability and long fluorescence lifetime, and has the potential of low toxicity. Due to the advantages, the material has a huge application prospect in the fields of biological imaging, fluorescence detection, solid-state illumination and the like.

A color conversion particle includes a core; and a shell that contains the core and absorbs excitation light, and emits light at the core or at an interface between the core and the shell upon receiving the irradiated excitation light. The core is composed of a chalcogenide perovskite, and the core and the shell have band alignment that induces a Stokes shift.

This invention provides a copper-iodine hybrid cluster compound having the structure shown in formula (I). Compared with the prior art, the copper-iodine hybrid cluster compound provided by this invention has excellent thermal stability, high fluorescence quantum yield, large Stokes shift, high solubility, strong absorption in the ultraviolet region, and a simple synthesis method. It meets the requirements of ideal transparent solar concentrator materials and ultraviolet shielding agents, and has broad application prospects in the field of building-integrated photovoltaics. In addition, it can also be applied to anti-counterfeiting coatings, solid-state lighting, X-ray imaging, and other fields.

The invention relates to the field of heavy metal ion detection, in particular to a preparation method and application of a mercury ion colorimetric and ratiometric fluorescent probe based on carbazole. The preparation method of the colorimetric and ratiometric fluorescent probe comprises the following step: carrying out reaction on O-(4-(bromomethyl) phenyl) diphenyl selenophosphonate and (E)-9-ethyl-3-(2-(quinoline-4-yl) vinyl)-9H-carbazole in acetonitrile to generate (E)-1-(4-((diphenyl selenophosphoryloxy) benzyl)-4-(2-(9-ethyl-9H-carbazole-3-yl) vinyl) quinoline bromide. The fluorescent probe has the advantages of simple synthesis route, strong operability, easily available raw materials and low cost, can realize rapid detection of mercury ions by using colorimetric and change of the ratio F528nm / F648nm of fluorescence intensities at two different emission wavelengths, and has the advantages of large Stokes shift, high sensitivity, good selectivity and the like.

This invention proposes a gallium nitride-based semiconductor laser, comprising, from bottom to top, a substrate, a lower confinement layer, a lower waveguide layer, an active layer, an upper waveguide layer, and an upper confinement layer. This invention incorporates a multi-layered, multi-vacancy electron-phonon modulation layer within the semiconductor laser element, defining the electron affinity distribution and polarization optical phonon energy distribution characteristics of each multi-vacancy electron-phonon modulation layer. This forms single-vacancy, vacancy cluster, and multi-vacancy modulated electron-phonon structures, localizing electron-phonons between the lower confinement layer and the lower waveguide layer. This reduces the Stokes shift caused by the photon energy difference between the pump light and the oscillating light, reduces heat loss from phonon vibration and phonon transport, improves the heat dissipation of the laser element, mitigates interlayer thermal mismatch, suppresses the thermal lensing effect and stress birefringence effect of the laser, improves laser beam distortion and depolarization, and enhances the laser beam quality factor.

The application provides an organic-inorganic hybrid lead-based halide perovskite material and a preparation method and application thereof. The organic-inorganic hybrid lead-based halide perovskite material has a one-dimensional face-sharing perovskite structure or a quasi-one-dimensional face-sharing perovskite structure, and a chemical general formula of the organic-inorganic hybrid lead-based halide perovskite material is APbX3, A includes an alkyl-substituted triphenylphosphine cation, and X is at least one of halogen elements. The organic-inorganic hybrid lead-based halide perovskite material provided by the application has a one-dimensional or quasi-one-dimensional face-sharing perovskite structure under a specific component composition, can simultaneously realize material properties of no self-absorption and nanosecond-level ultrafast self-trapped exciton emission, has a large Stokes shift, breaks through the traditional STE ''slow decay'' fixed limit, has a high X-ray absorption capacity, has low detection limit and high spatial resolution, and is suitable for low-dose and high-resolution imaging.

The preparation method of a phosphorescent group 7H-indole [2,3-c] quinoline series derivative with light response belongs to the field of organic intelligent materials. Several organic phosphorescent materials with NBCz as the core provided in the application can realize a color change from green or yellow-green afterglow to orange-yellow afterglow under the influence of different light activation times of a 365nm ultraviolet lamp, so as to achieve light-induced phosphorescent color change-stimulative response, and therefore can be widely applied to anti-counterfeiting, data encryption and sensing applications. The organic phosphorescent material with NBCz as the core has the following advantages: (1) simple and easy-to-follow synthesis route; (2) simple light activation condition; (3) large stokes shift, and remarkable effect.

The invention relates to the field of fluorescent probes, in particular to a CO fluorescent probe (RDM-CO) as well as a preparation method and application thereof in cadmium pollution resistance of plants. The fluorescent probe is constructed by integrating a recognition group allyl chloroformate unit into a rhodamine derivative skeleton. On the basis of a Pd < 2 + > mediated Tsujii-Trost reaction mechanism, the fluorescence emission can be obviously enhanced within 13 minutes. The probe shows excellent photophysical characteristics, including near-infrared emission wavelength (653 nm), large Stokes shift (63 nm), high selectivity and low detection limit (1.35 mu M), and is suitable for quantitative and visual detection of endogenous CO generation of plants under cadmium stress.

The invention discloses a high-sensitivity hydrogen sulfide fluorescent probe based on porphyrin-nitrobenzoxadiazole donor-acceptor molecular engineering and a synthesis method thereof. The structural formula of the probe is shown in the specification. According to the probe, a nitrobenzoxadiazole group is introduced to the periphery of a porphyrin macroring, and an intramolecular donor-acceptor system is constructed. The detection mechanism is based on a nucleophilic substitution reaction of hydrogen sulfide to a phenyl ether bond, and a nitrobenzoxadiazole group is removed, so that electron transfer under optical excitation is inhibited, and red fluorescence emission of porphyrin is recovered. After the probe reacts with hydrogen sulfide, the probe presents an obvious fluorescence signal at 653 nm under excitation of 417 nm, the Stokes shift reaches 236 nm, and the probe has the advantages of obvious fluorescence response, good water solubility, high fluorescence quantum yield and the like, can realize high-selectivity detection of hydrogen sulfide, and has wide application prospects in the fields of analytical chemistry, life science, environmental monitoring, biomedical treatment and the like.

This invention belongs to the field of fluorescent luminescent materials technology, and relates to a method for preparing red carbon dots with a long Stokes shift. The technical problem to be solved is that although existing red carbon dots have emission wavelengths exceeding 600 nm, their Stokes shifts are too small, resulting in defects such as fluorescence self-absorption, severe overlap between excitation and emission spectra, and easy triggering of fluorescence quenching during complexation with polymer carriers or biomolecules. The technical solution includes: mixing p-phenylenediamine and anhydrous ethanol at a mass-to-volume ratio of 0.01 g / mL to 0.02 g / mL, and ultrasonically treating to obtain a homogeneous mixture; placing the mixture in a high-pressure reactor and performing a solvothermal reaction at 180°C to 220°C for 4 to 8 hours; after the reaction, cooling to room temperature, collecting the reaction solution, concentrating under reduced pressure, dialyzing the concentrated solution in a dialysis bag with deionized water for purification, and finally freeze-drying to obtain the red carbon dots.

The environmentally friendly, high-efficiency, lead-free perovskite quantum dot fluorescent solar collector disclosed in this invention comprises a transparent optical waveguide matrix and a fluorescent emitter dispersed in the transparent optical waveguide matrix. The transparent optical waveguide matrix is ​​polydimethylsiloxane, and the fluorescent emitter is Bi. 3+ Doped lead-free perovskite quantum dots Cs2Na 0.6 Ag 0.4 The molar composition formula for the InCl6 phosphor is Cs2Na. 0.6 Ag 0.4 In 1‑ x Bi x Cl6, where x is Bi 3+ The mole fraction of doping, x, ranges from 0.01 to 0.2. This fluorescent solar concentrator features ultra-wideband emission (450–750 nm) and ultra-large Stokes shift (approximately 244 nm), with an internal quantum efficiency of up to 41.7%, visible light transmittance greater than 80%, and excellent flexibility, allowing for easy shape adjustment for better compatibility with buildings, thus achieving building-integrated photovoltaics (BIPV) and meeting the dual requirements of BIPV for building material transparency and photoelectric performance.

The application discloses a chymotrypsin near-infrared fluorescent probe with a large stokes shift and a preparation method and application thereof. A fluorescent probe molecule TCF-CHT has a structural formula as shown in formula I. When a 530nm excitation wavelength is used for excitation, the TCF-CHT itself has weak fluorescence at 670nm, but it can selectively have a fluorescence opening reaction with the CHT. With the increase of the CHT concentration, the 670nm fluorescence intensity is gradually enhanced, and other common interfering ions and species cannot obviously interfere with and influence the TCF-CHT as an analysis reagent for detecting the CHT. Since the emission wavelength is in the near-infrared region and a large stokes shift (140nm) is generated, the interference of the system background fluorescence is greatly reduced, and the sensitivity of the CHT activity detection is improved. Therefore, the TCF-CHT is suitable for the fluorescence detection of the CHT with high selectivity and high sensitivity.

Provided in the present invention is an optical material made of polyamide. The material is characterized in that the specific conditions in the present invention are met; and the polyamide is a copolymer of a lactam and an optically functional ring-opening agent, which copolymer comprises a first structural unit derived from the lactam, and a second structural unit and a third structural unit which are derived from the optically functional ring-opening agent, and further optionally has a fourth structural unit derived from the optically functional ring-opening agent. The resulting polyamide optical material has intrinsic photoluminescence, and has a fluorescence emission wavelength greater than 450 nm and a Stokes shift greater than 60 nm. Moreover, the material has low transmittance regarding both UV having a wavelength of 250-400 nm and blue-violet light, and exhibits good transmittance in the visible-light region at a wavelength of 600 nm. The polyamide optical material of the present invention exhibits good film-forming properties and processability, and can be widely used in fields such as optical protection, fluorescence imaging, smart lenses, optical data storage and anti-counterfeiting.

The application relates to design and synthesis of acridine fluoroboron dyes with large Stokes shift, and belongs to the technical field of preparation of organic functional materials. The molecular structure is as follows: wherein R=Me, HNCOCH3, Br, CN. Compared with traditional fluoroboron dyes, the new fluoroboron dyes have long emission wavelength, large Stokes shift and high fluorescence quantum yield, and have good application prospect in biological imaging and the like.

Disclosed is a fluorescent probe for glucose oxidase β The application discloses a kind of with big stokes shift The structure of the fluorescent probe QM-GLU is shown as formula I.The QM-GLU has almost no fluorescence at 560 nm when excited by a 450 nm wavelength, but can selectively undergo a fluorescence opening reaction with GLU.The fluorescence intensity at 560 nm gradually increases with the increase of GLU concentration, and other common interfering substances do not significantly interfere with the detection of GLU by QM-GLU and have no effect.Due to the characteristics of its AIE mechanism, and has a large stokes shift (110 nm), which greatly reduces the interference of system background fluorescence and improves the sensitivity of GLU activity detection.Therefore, QM-GLU is suitable for high selectivity and high sensitivity fluorescence detection of GLU.

This invention discloses a cell membrane-targeted H2S two-photon fluorescent probe, its preparation method, and its applications. This probe not only possesses excellent optical properties such as near-infrared fluorescence emission at 650 nm, a large Stokes shift of 140 nm, and two-photon excitation characteristics, exhibiting advantages such as low excitation-emission light scattering, low tissue absorption, and strong penetration, but also demonstrates excellent analytical and detection performance. Its pyridinium and sulfonic acid groups prevent it from entering the cell interior, allowing it to adhere only to the cell membrane surface, thus endowing the probe with excellent cell membrane localization capabilities. The probe uses a 2,4-dinitrobenzenesulfonyl group as both the H2S recognition group and a fluorescence quencher. Because the 2,4-dinitrobenzenesulfonyl group is adjacent to the pyridinium group, it is located on the outer surface of the cell membrane, enabling two-photon fluorescence imaging of H2S released transmembrane from cells.

The invention discloses a zero-dimensional organic-inorganic hybrid halide scintillator single crystal, a preparation method and application, and belongs to the technical field of X-ray excitation scintillator materials. The chemical formula of the scintillator single crystal is C46H48P2Cu4I6, the molecular weight of the scintillator single crystal is 1678.34, the crystal system of the scintillator single crystal is triclinic, and the space group of the scintillator single crystal is P-1; the unit cell parameters are as follows: a is equal to 11.1027, b is equal to 11.8913, c is equal to 12.510, alpha is equal to 64.126 degrees, beta is equal to 68.782 degrees, and gamma is equal to 66.901 degrees. The scintillator single crystal has relatively large Stokes shift and high photoluminescence quantum efficiency (PLQY), and emits green light under ultraviolet light. A scintillator film prepared from the zero-dimensional organic-inorganic hybrid halide scintillator single crystal has good X-ray light yield, and can be used for X-ray imaging to obtain high-resolution imaging pictures.

The application discloses a ratio type near-infrared fluorescent probe based on an ICT-FRET mechanism and a preparation method and application thereof. The ratio type near-infrared fluorescent probe based on the ICT-FRET mechanism emits in a near-infrared region, has an ultra-large stokes shift, can effectively avoid excitation light interference and self-absorption, reduces biological background fluorescence, and is suitable for deep tissue imaging. The probe can realize double-emission ratio response (I 660 / I 540 ) based on the FRET mechanism, has a significant signal change, has inherent self-calibration capability, shows extremely high selectivity to Cys, has almost no response to Hcy and GSH similar in structure, is strong in anti-environmental interference, and is more accurate in quantification. The TPP targeting group of the probe enables the probe to be specifically positioned in mitochondria of living cells, realizes dynamic ratio imaging of endogenous and exogenous Cys in mitochondria, and provides a powerful tool for studying Cys metabolism at a subcellular level.

The application discloses a benzothiadiazole type fluorescent probe for detecting HClO and a preparation method thereof, and belongs to the technical field of organic synthesis and HClO analysis. An intermediate B-CHO is obtained through Suzuki coupling with 4,7-dibromo-2,1,3 benzothiadiazole and p-formylphenylboronic acid as raw materials, and then a high-selectivity hypochlorous acid fluorescent probe is prepared through condensation reaction of the intermediate B-CHO with hydroxylamine hydrochloride. The probe can rapidly and specifically recognize HClO under the interference of common cations, anions, H2O2 and biological thiols. The fluorescent organic small molecule BTD-OH has the advantages of simple synthesis method, good thermal stability, strong fluorescence emission, large Stokes shift (119nm) and good stability, and can be stored as a pure solid or a solution at room temperature. The probe has the advantages of simple preparation, high yield, fast response speed, small toxicity, strong stability and specificity, and can be used as an effective hypochlorous acid detection tool in actual application.