468 results about "Emission spectrum" patented technology

The invention provides a boron-nitrogen heterocyclic compound as well as an intermediate and a preparation method thereof, the boron-nitrogen heterocyclic compound has a structure as shown in a general formula (1), and is prepared by taking compounds as shown in a formula A, a formula B and a formula C as intermediates. Compared with similar carbon skeleton molecules, the boron-nitrogen heterocyclic compound provided by the invention shows an excellent narrow-band luminescence property. The half-peak width of the emission spectrum of the boron-aza compound is as low as 6.4 nm, and meanwhile, the fluorescence quantum yield is as high as 97%.

The invention belongs to the technical field of OLEDs, and provides a polycyclic compound containing triphenyl silicon and a polyalkyl substituent group and an organic electroluminescent device containing the polycyclic compound. The structural general formula of the polycyclic compound is as shown in formula I in the specification. Benzofuran with higher electronegativity is introduced to a ring structure composed of nitrogen atoms and boron atoms, triphenyl silicon is introduced to the para-position of boron, and the synergistic effect of benzofuran and triphenyl silicon can significantly enhance the multiple resonance of a light-emitting core and reduce vibration relaxation. Due to simultaneous use of the benzofuran and the triphenyl silicon, the problems of vibration relaxation increase, spectrum widening and the like caused by introduction of the polyalkyl substituent are remarkably improved, the luminous efficiency of the material is remarkably improved, and the color purity is improved, so that the requirement of BT.2020 wide color gamut display standard on a luminescent spectrum is met. I

The invention discloses a metal 3D printing detection method and device based on emission spectrum and ultrasonic fusion. The method comprises the following steps: synchronously exciting and collecting full-wave band spectrum and ultrasonic signals on the surface of a sample through laser, preprocessing the signals, inputting the preprocessed signals into a multi-modal deep learning model integrated with an LANet network for feature extraction and fusion, and realizing multi-dimensional detection by using the fused features; the analysis module is used for analyzing element components and chemical defects; a double-flow time sequence network is constructed, time domain characteristics of the ultrasonic signals are analyzed in parallel to evaluate physical defects, and frequency domain sound velocity information is analyzed to evaluate residual stress; and modeling the attenuation characteristics of the ultrasonic signal by using a deep learning model, and calculating an ultrasonic attenuation coefficient to obtain probability distribution of the grain size. According to the method, the two signals are fused, the detection accuracy is improved by utilizing the strong feature mining and nonlinear mapping capability of deep learning, and multi-dimensional comprehensive evaluation of the metal 3D printing component is realized.

A first pumping source and a second pumping source are combined through a pumping beam combiner and are coupled into an erbium-doped fluoride fiber and a high-reflectivity fiber bragg grating, and the erbium-doped fluoride fiber and a low-reflectivity fiber bragg grating form a laser resonant cavity. The intermediate infrared laser is output through the low-reflectivity fiber bragg grating, the cladding light filter and the optical fiber end cap; the high-reflectivity fiber bragg grating and the low-reflectivity fiber bragg grating have the same grating period, the fourth-order harmonic reflection wavelength of the grating is located in the emission spectrum range of transition of erbium ions from the 4F9 / 2 energy level to the 4I9 / 2 energy level, and the fifth-order harmonic reflection wavelength of the grating is located in the emission spectrum range of transition of erbium ions from the 4I11 / 2 energy level to the 4I13 / 2 energy level; by adjusting the power of the first pumping source and the second pumping source, the net gain of laser transitions from the 4F9 / 2 energy level to the 4I9 / 2 energy level and transitions from the 4I11 / 2 energy level to the 4I13 / 2 energy level is regulated and controlled, and switching of laser working wavelengths is achieved.

The invention belongs to the technical field of organic synthesis, and particularly relates to a salicylaldehyde hydrazone bridged organic boron photoinitiator as well as a preparation method and application thereof. The structural formula of the salicylaldehyde hydrazone bridged organic boron photoinitiator is as shown in formula I, wherein R is H or halogen atom; the salicylaldehyde hydrazone bridged organic boron photoinitiator has a vertical spatial configuration formed by a seven-membered ring and a six-membered ring. A framework of the salicylaldehyde hydrazone bridged organic boron photoinitiator has a unique vertical spatial configuration, generation of a spinning triplet state can be effectively promoted through orbital angular momentum regulation and control, and a more favorable excited state characteristic is provided for a photoinitiation process. The absorption wavelength and the emission spectrum of an LED light source are well overlapped, and high reaction activity can still be kept under the conditions of low irradiation intensity (lt, 60 mW / cm) and short exposure time (lt, 60 s). In addition, the preparation method of the salicylaldehyde hydrazone bridged organic boron photoinitiator is simple and efficient, the raw material cost is low, and the salicylaldehyde hydrazone bridged organic boron photoinitiator has a wide application prospect.

The invention provides a red light and infrared light-emitting compound based on a boron-nitrogen fused ring and application thereof. The invention provides a boron-nitrogen polycyclic aromatic hydrocarbon material of a fused naphthalene ring, and a specific strong electron withdrawing group is introduced to a boron atom para-position. Compared with a compound disclosed in the prior art, the compound provided by the invention introduces a strong electron withdrawing group to a boron atom para-position of boron-nitrogen polycyclic aromatic hydrocarbon of a fused naphthalene ring, so that the emission spectrum of the material can be subjected to significant red shift (red shift from a yellow light band to a red light band and even an infrared band), and red light and even infrared light emission with high luminous efficiency and a narrow band can be realized. An electroluminescent device prepared from the compound provided by the invention shows relatively high luminescent color purity and relatively excellent luminous efficiency, and can meet the requirements of current enterprise production on high-performance luminescent materials.

The invention provides an organic electroluminescent material and an organic electroluminescent device, and belongs to the field of organic electroluminescent materials, and the organic electroluminescent material has a structure as shown in a formula I. The organic electroluminescent material has low refractive index, and can be used as a luminescent auxiliary material and applied to a thicker layer in a double-layer luminescent auxiliary material, so that the organic electroluminescent material can be used as a light-emitting auxiliary material. The light emitted from the device passes through the low-refractive-index film layer of the formula I, the organic electroluminescent device prepared by matching the low-refractive-index film layer with the high-refractive-index light-emitting auxiliary material can play a better light gathering role, the light with the specific wavelength in the light emitted from the device is emitted out, the emission spectrum can be narrowed, the light-emitting intensity of the light with the specific wavelength is enhanced, and the light-emitting efficiency of the organic electroluminescent device is improved. The light loss is reduced, the luminous efficiency of the device is improved, and meanwhile, the lower driving voltage and the longer service life of the device are ensured.

A display device comprises a plurality of pixels, each with a filter element. The display device also includes a laser light source for emitting source light with an adjustable wavelength. The source light can be sequentially directed into the filter elements of the pixels. Each filter element has an emission spectrum that exhibits an intensity maximum at a resonance wavelength that depends on a specific emission angle.

Systems, including methods and compositions, for performing multiplexed assays. The methods may include (A) providing a mixture including (i) a sample having one or more of a plurality of distinct nucleic acid targets, (ii) amplification reagents sufficient for amplification of the targets, and (iii) a tethered probe specific to each target, (B) amplifying the plurality of targets in the mixture, (C) measuring fluorescence from the tethered probe for each target; and (D) determining from the measured fluorescence a quantity representative of a level of each of the targets in the sample. Each tethered probe may include respective first and second fluorophores, with distinguishable excitation and / or emission spectra, and a respective quencher. The probes are configured such that an intensity of fluorescence from one or both fluorophores is altered during amplification of the respective target, so that changes in fluorescence can be used to assess the degree of amplification of the respective target.

A surface-treated steel sheet including: a steel sheet; and a nickel-cobalt-iron diffusion layer formed on the steel sheet as an outermost layer. When the intensities for Ni, Co and Fe are consecutively measured from a surface of the nickel-cobalt-iron diffusion layer in the depth direction by radio frequency glow discharge optical emission spectrometry, and the concentration of Ni, Co and Fe at each of depth positions are determined based on the intensities for Ni, Co, and Fe, a Co concentration gradient ΔPCo ranging from a depth position DCo_MAX to a depth position DCo_15% is 33% by mass / 0.1 μm or less. A depth position at which the concentration of Co is maximum is defined as DCo_MAX and a depth position located closer to the steel sheet than the depth position DCo_MAX and at which the concentration of Co is 15% of the maximum value is defined as DCo_15%.

Provided is a light-emitting element which includes a light-emitting layer containing a phosphorescent compound, a first organic compound, and a second organic compound between a pair of electrodes. A combination of the first organic compound and the second organic compound forms an exciplex (excited complex). An emission spectrum of the exciplex overlaps with an absorption band located on the longest wavelength side of an absorption spectrum of the phosphorescent compound. A peak wavelength of the emission spectrum of the exciplex is longer than or equal to a peak wavelength of the absorption band located on the longest wavelength side of the absorp-tion spectrum of the phosphorescent compound.

A carbon dioxide (CO2) hydrogenation catalyst and a method of its preparation. The CO2 hydrogenation catalyst includes an alkali-metal enriched bauxite residue including calcium carbonate (CaCO3), iron(III) oxide (Fe2O3), iron(III) oxyhydroxide (FeO(OH)), aluminum hydroxide (Al(OH)3), sodalite, muscovite, and Na5Al2CSi3O15. The CO2 hydrogenation catalyst further includes 1 weight percent (wt. %) to 10 wt. % potassium based on a total weight of the CO2 hydrogenation catalyst by inductively coupled plasma optical emission spectroscopy (ICP-OES). The CO2 hydrogenation catalyst is used in a method of hydrogenating carbon dioxide to produce olefins.

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.

The present disclosure discloses a device for detecting substances in a liquid to be tested using plasma spectroscopy, including an electrode, at least a portion of which is configured to be disposed in the liquid to be tested and is suitable to contact the liquid to be tested, the electrode being suitable to generate a plasma in the liquid to be tested by applying an external voltage, wherein the plasma is located in a bubble generated by the external voltage; a light detector, configured to detect the emission spectrum generated by the plasma in the bubble, wherein the light detector is an optical fiber, and there is no focusing element between the light detector and the plasma.

The application belongs to the technical field of luminescent materials, and particularly relates to a binuclear platinum complex and application thereof. The binuclear platinum complex has the structure shown in formula (1), and when used in an OLED, especially in a blue light emitting region, the binuclear platinum complex exhibits enhanced phosphorescence quantum yield, good luminescence stability, high luminescence efficiency, and is suitable for use as an emitter material in OLED application. The metal platinum complex of the application can obtain an organic electroluminescent device with deep blue phosphorescence and improved luminescence efficiency, and the luminescent device has good thermal stability. The binuclear platinum complex has the advantages of narrow emission spectrum, high stability and high efficiency by adjusting the structure of the ligand around the metal center and the structure of the substituent on the ligand to control the photophysical properties, and has wide application prospects in many fields such as OLED display and lighting.

A method for generating a light source in a detection module and a detection module. The method includes: obtaining a sensor having a sensing spectral curve in a predetermined wavelength range; and arranging a light source to generate a predetermined light having an emitting spectral curve in the predetermined wavelength range. After the sensing spectral curve and the emitting spectral curve are overlapped with each other, a matching curve is generated and a standard deviation of the matching curve is less than 0.1. The matching curve generated after the sensing spectral curve and the emitting spectral curve are overlapped is expressed by the following equation: Z(λ)=W(λ)·S(π), where λ is a wavelength, S(π) is the sensing spectral curve, W(λ) is the emitting spectral curve, and Z(λ) is the matching curve.

The invention belongs to the field of electroluminescence, and particularly discloses an organic electroluminescent device and a display device. The organic light-emitting device comprises a light-emitting layer, and the light-emitting layer comprises a boron-nitrogen compound as a light-emitting guest material, wherein the structural formula of the boron-nitrogen compound is shown in a formula I; formula I; according to the present invention, the specific boron-nitrogen compound is adopted as the light-emitting guest material of the device light-emitting layer, and on the basis of the rigid structure, the specific boron-nitrogen compound increases the molecular conjugation and induces the intermolecular pi-pi interaction so as to produce the excimer emission; the monomolecular double emission spectrum can cover blue light and yellow light areas, so that the problems of intermediate phase separation and poor color purity stability of different luminescent materials in the prior art are solved. The organic light-emitting device prepared by adopting the specific boron-nitrogen compound has the characteristics of high external quantum efficiency, small device efficiency roll-off and good color purity stability, and further development of a WOLED (White Organic Light-Emitting Diode) device is facilitated.

A light-emitting substrate includes a base substrate, a light-emitting unit and a light extraction member arranged in sequence. The light-emitting unit includes at least one blue light-emitting device, a first light enhancement layer and a second light enhancement layer arranged in sequence. A blue light-emitting device includes a first electrode, at least one blue light-emitting layer and a second electrode sequentially stacked. An orthographic projection of the light extraction member on the base substrate at least partially overlaps with an orthographic projection of the blue light-emitting device on the base substrate. An absolute value of a difference between a wavelength corresponding to a transmittance peak of the light extraction member and a wavelength corresponding to an emission spectrum peak of the blue light-emitting device is less than or equal to 10 nm.

A chiral dinuclear Zn(II)-complex based on chiral Salen-type Schiff base ligands (R, R / S, S-L) and its preparation method, along with its application in electro-induced circularly polarized luminescence, were presented. With changes in the configuration of the chiral Salen-type Schiff base ligands, this type of chiral dinuclear Zn(II)-complex exhibited different light colors in the visible region. At room temperature, the chiral dinuclear Zn(II)-complex developed based on chiral Salen-type Schiff base ligands introduced by the methoxy (-OMe) functional group showed maximum emission peaks of 467 and 462 nm in CH2Cl2 solution, with CIE coordinates of (0.156, 0.192) and (0.158, 0.190), respectively, located in the blue light emission region. It exhibited a strong ground-state chiral signal and Cotton effect, with an asymmetry factor |g PL |~10 ‑4 The electroluminescent devices CP-OLED-R,R-II and CP-OLED-S,S-II all have a start-up voltage of 6V. Their maximum emission wavelengths for electro-polarized emission are 488nm and 496nm, respectively, with CIE coordinates located in the blue light region at (0.288, 0.305) and (0.283, 0.304), respectively. The maximum current efficiency of CP-OLED-R,R-II is 0.90cd / A, the maximum power efficiency is 0.47lm / W, and the maximum external quantum efficiency is 0.43%. The maximum current efficiency of CP-OLED-S,S-II is 0.83cd / A, the maximum power efficiency is 0.40lm / W, and the maximum external quantum efficiency is 0.38%. The asymmetry factor |g EL |~10 ‑4 .

A calibration light source includes: a broad band light source emitting light in a broad spectral range; and a filter receiving light emitted by the broad band light source and providing structured light by imposing an attenuation pattern exhibiting pattern features at multiple spectral reference lines on the received light such that an emission spectrum of the structured light emitted by the calibration light source exhibits distinct, identifiable emission spectrum features corresponding to the pattern features at the multiple spectral reference lines. A method of calibrating at least one spectrometer using the calibration light source is further disclosed.

The present application belongs to the technical field of food safety detection, and discloses a rapid Raman detection system and method for illegal additives in food; the illegal additives are enriched through dispersed liquid-liquid microextraction pretreatment, fluorescence emission spectrum data is obtained under low-power broadband excitation, and a fluorescence intensity gradient analysis is used to identify a fluorescence saturation risk section. The target spectrum range is divided into weak fluorescence and strong fluorescence collection windows arranged alternately, and differentiated collection parameters and processing strategies are used respectively; the offset excitation technology is used for the strong fluorescence window to obtain a difference spectrum; and the weak fluorescence window is used for accurate baseline deduction to generate a purified spectrum. Through splicing and connection, a complete composite purified spectrum is formed, and Raman true peaks and fluorescence false peaks are distinguished by combining peak identification and peak shape symmetry analysis. Finally, template matching is carried out based on peak position combination and intensity ratio characteristics, so that the illegal additives are accurately identified. The present application improves the accuracy, sensitivity and efficiency of food safety rapid screening.

This invention discloses an isotope abundance detection method and system based on the centroid method of emission spectroscopy, belonging to the fields of analytical chemistry and spectroscopic analysis technology. This method measures the centroid position of the atomic spectral lines or molecular spectral bands of the target element, utilizing the quantitative relationship between the centroid position and isotope abundance to achieve rapid, accurate, and low-cost detection of isotope abundance. This invention is the first to systematically establish a complete theoretical framework for the use of the centroid method of emission spectroscopy for isotope abundance detection, revealing the strict linearity conditions between the centroid and abundance, as well as the sources of error. This method is applicable to various excitation sources such as microwave plasma, inductively coupled plasma, and laser-induced breakdown plasma, covering both atomic and molecular spectroscopy detection modes, significantly reducing the resolution requirements of the spectrometer and exhibiting good noise interference resistance. This invention can be widely applied in fields such as nuclear engineering, semiconductor industry, environmental science, geochemistry, and medicine.

The application discloses a vanadium ion doped phosphate-based luminescent material, a preparation method and application thereof, and a chemical general formula of the luminescent material is Ca9AlP 7(1‑x) O 28 :xV 5+ , wherein x=0.005-0.04. The luminescent material can generate wideband emission from 400nm to 600nm under excitation of 300nm ultraviolet light, and the peak position is near 480nm. The vanadium ion doped phosphate-based luminescent material emits a spectrum with an integral intensity Omega, which changes as a function of temperature T, Omega=1.457*exp(-T / 145.367)-0.169, and the relative sensitivity obtained at 250 DEG C reaches 2.03% DEG C ‑1 . The material has application potential in the field of optical thermometers and the like. In addition, the luminescent material has the advantages of simple preparation method, low cost and the like.

The invention provides aluminate dark red fluorescent powder as well as a preparation method and application thereof, and belongs to the technical field of solid luminescent materials. According to the aluminate dark red fluorescent powder, manganese is adopted to activate aluminate, the excitation spectrum coverage area is wide, the excitation range covers most of ultraviolet and blue light areas, and the emission spectrum is concentrated near 659nm. The fluorescent powder can absorb light from ultraviolet light to a blue light region in a solar spectrum, has very strong emission intensity in a dark red light region, can emit red light under the irradiation of sunlight, can improve the utilization rate of light energy, and is more favorable for promoting the photoelectric conversion efficiency of a silicon solar cell. The fluorescent powder can be prepared into a film to be compounded on the surface of a solar cell, the solar spectrum is optimized, and the energy conversion efficiency of the solar cell is improved.

The application discloses a dihexylfluorene-long-chain alkyl aniline polymer and a preparation method thereof, and belongs to the technical field of organic polymer polymers. The structural formula of the polymer is shown as formula (I): formula (I). The introduction of the long-chain alkyl aniline in the polymer does not destroy the conjugated structure of the polymer chain, and can appropriately increase the distance between dihexylfluorene units, inhibit the association phenomenon, and then be beneficial to obtaining obvious narrow-peak, single-peak fluorescence emission spectrum and pure light-emitting color.

The invention relates to the technical field of photovoltaic modules, and particularly discloses a tetraphenyl ethylene-benzotriazole derivative compound and application thereof in the photovoltaic field. The absorption spectrum of the tetraphenyl ethylene-benzotriazole derivative compound disclosed by the invention can be subjected to red shift to 420 nm, so that high-energy ultraviolet light can be completely absorbed; the maximum emission wavelength of a fluorescence emission spectrum is more than 440nm and even can reach 500nm, so that the light utilization level of the crystalline silicon solar cell is improved; the absolute light-emitting quantum efficiency is very high, and the converted wavelength can be better utilized by a photovoltaic device. The substituted tetraphenyl ethylene part contained in the derivative compound has AIE performance, and the fluorescence quenching effect of traditional small organic molecules in high concentration, solid state and aggregation state is avoided. The light conversion film can overcome the problem that the fluorescence quantum yield is remarkably reduced in the laminating process, the performance of the film is not affected when the phenomena of precipitation, agglomeration and the like of auxiliaries in the film occur, and the light conversion film is used for preparing a photovoltaic module.

The invention provides a near-infrared beta-galactosidase fluorescent probe as well as preparation and application thereof, and relates to the technical field of fluorescent probes, according to the near-infrared beta-galactosidase fluorescent probe, when beta-galactosidase exists, a D-galactosyl group can be split, meanwhile, self-elimination of p-hydroxybenzyl is removed, a fluorescent signal unit is released, and the beta-galactosidase can be detected by the near-infrared beta-galactosidase fluorescent probe. The fluorescence signal is obviously enhanced. Excitation and emission spectra of the near-infrared beta-galactosidase fluorescent probe are both in a near-infrared region, the fluorescence intensity at 760 nm is rapidly increased, the fluorescence intensity rapidly reaches a stable state after 30 min, and compared with a visible light probe, the near-infrared beta-galactosidase fluorescent probe has deeper tissue penetrating capacity, background interference can be effectively avoided, and the resolution ratio is improved; the compound can be applied to beta-galactosidase detection imaging and preparation of beta-galactosidase detection imaging reagents, especially breast cancer detection reagents.

The invention belongs to the technical field of inorganic scintillator materials, and particularly relates to a multi-element co-doped yttrium lutetium silicate scintillator and a preparation method and application thereof, and the material has excellent comprehensive performance of high light output, short decay time, high radiation hardness, high matching degree of emission spectrum and novel photoelectric sensors and the like. The invention further relates to a preparation method of the scintillator material and application of the scintillator material in radiation detection fields such as positron emission tomography (PET), time flight PET (TOF-PET), interaction depth PET (DOI-PET), single photon emission computed tomography (SPECT), high-energy physical experiments, nuclear medicine imaging, industrial nondestructive inspection, safety detection (such as luggage and cargo container inspection) and the like.

The invention provides an isotope quantitative analysis method and system based on laser-induced breakdown spectroscopy, and relates to the technical field of laser spectrums.The method comprises the steps that a liquid analysis environment is constructed according to the form of a sample to be detected; focusing a pulse laser beam in the liquid analysis environment to ablate a sample to be detected so as to generate plasma; collecting an emission spectrum signal generated in the plasma cooling process; and extracting an isotope characteristic spectral line of a target element from the emission spectrum signal, and carrying out isotope quantitative analysis based on spectral line information of the isotope characteristic spectral line. According to the device and the method, spectral line broadening and self-absorption can be effectively inhibited in mechanism, the resolution ratio of the isotope spectral line is remarkably improved, the device is simple, the cost is low, and a reliable and economical solution is provided for realizing high-performance isotope in-situ and rapid quantitative analysis in the fields of nuclear industry and the like by a laser-induced breakdown spectroscopy technology.

The present invention provides a design method for a light source of a light irradiation device that is used during usage or storage of a photosensitive substance or when managing a patient who has been administered a photosensitive substance. A design method according to the present invention comprises: a step for obtaining an emission spectrum of a reference light source; a step for obtaining an emission spectrum of a light source to be evaluated; a step for obtaining an absorption coefficient of a photosensitive substance; and a step for using the absorption coefficient and the obtained light source spectra to find the ratio of absorption energy in the photosensitive substance caused by irradiation from the reference light source to absorption energy in the photosensitive substance caused by irradiation from the light source to be evaluated, and using said ratio to design a light source.