179 results about "Excitation spectra" patented technology

The present invention is directed to a monitor system that measures flight characteristics of at least one object moving in a predetermined field-of-view using at least one fluorescent marker. In one embodiment, the emission spectra of the fluorescent marker is preferably narrow and substantially symmetric. It may be desirable for the fluorescent marker to be capable of responding to a broad excitation spectra. Preferably, the fluorescent markers comprise quantum dots. The quantum dots may be manufactured in any desired manner, and may comprise semiconductors, gold atoms, and the like.

This invention discloses an Excitation Emission Matrix (EEM) fluorescence spectrometer system that uses an LED array to cause excitation emission matrix fluorescence that is imaged onto a spectrograph for sample identification and analysis. By using the LED array, the spectrograph requires only high spectroscopic resolution of about 1 to 5 nm in the fluorescence emission range and low excitation light resolution of about 14 to 73 nm in the excitation range. While individual LED optical excitation spectra may contain wavelength regions that overlap, as long as the various LEDs have different excitation wavelengths and intensities, spectral overlap does not preclude data analysis. The invention provides an EEM spectroscopy system that is not a high resolution such as a laser or lamp based excitation system, but instead uses a lower resolution, lower power LED system. The invention also provides results that are comparable to existing systems with lower component cost and lower power requirements while also optically stable, small, and easy to use.

The invention discloses a preparation method of functional fluorescence carbon nanoparticles (CNPs) based on natural saccharide materials and representation and application thereof in measurement for biotechnique. The preparation method is characterized by comprises the following steps of dissolving 1g of carbon sources (cellulose, starch, chitosan and cyclodextrin) and 0.1g of NaOH into 15ml of deionized water, then reacting reacting for 4 hours in an autoclave at 160 DEG C, and carrying out acid-base neutralization and microwave treatment on the obtained carbon nanoparticles. According to the preparation method, the raw materials are abundant and cheap and are easily available, the preparation method is simple, and the synthesized nanoparticles have good fluorescence characteristic and the characteristics of stable fluorescence, dark flashing, tunable wavelength, wide excitation spectra, narrow emission spectrum and the like, and can be used as a fluorescence indicator in the biological medicine field.

A phosphor converted light emitting device includes a semiconductor structure comprising a light emitting layer disposed between an n-type region and a p-type region, the light emitting layer being configured to emit light having a first peak wavelength; a first phosphor configured to emit light having a second peak wavelength; and a second phosphor configured to emit light having a third peak wavelength. The second phosphor is an Eu³⁺-activated phosphor, configured such that in the excitation spectrum at 298K and 1.013 bar, a maximum intensity in a wavelength range between 460 nm and 470 nm is at least 5% of a maximum intensity in a wavelength range between 220 nm to 320 nm.

The invention provides an LED package. The LED package at least comprises a support, a wafer, weld lines and a sealing component, wherein the support is used for supporting the wafer and the weld lines, the wafer is used for emitting light capable of effectively exciting fluorescent powder or quantum dots, the weld lines are used for connecting the wafer and the support, the quantum dots are distributed in the sealing component, and the sealing component is located in a path of light emitted from the wafer, is in the shape of a lens and is used for wrapping the wafer and the support. The sizes of the quantum dots can be changed to control emission spectra of the quantum dots; the LED package has very good stability; because wide excitation spectra and narrow emission spectra are provided, the color rendering index of the LED package is effectively improved; the LED package is high in light emitting efficiency.

The present invention concerns fluorescent proteins modified such that said modified fluorescent protein incorporates a cleavage site for a protease, cleavage of said modified fluorescent protein at said cleavage site by said protease causing the alteration of at least one of the emission and excitation spectra of said modified fluorescent protein. In particular, the invention is concerned with using these modified fluorescent proteins as probes for detecting protease activity in living cells during the programmed cell death process (apoptosis).

Also provided are nucleic acid sequence encoding same, recombinant DNA constructs expressing same, cells transformed or transfected with same, methods for detecting protease activity, and methods of detecting agents which affect protease activity, and kits for same.

The invention discloses near ultraviolet laser blue luminescent glass ceramic, which is oxyfluoride glass ceramic doped by bivalent europium ion comprising the following components in mol percentage: 45 to 60 percent of SiO2, 0 to 25 percent of Al2O3, 0 to 10 percent of Na2O, 0 to 10 percent of NaF, 0 to 20 percent of ZnF2, 10 to 50 percent of BaF2, 0.5 to 10 percent of EuF3, and 0 to 3 percent of clarificant and/or fluxing agent. A preparation method comprises processes of high-temperature melting in a reducing atmosphere and crystallization heat treatment, wherein trivalent europium ion is reduced to the bivalent europium ion. The method is simple, has no pollution and has low cost. The glass ceramic has wide excitation spectra in a near ultraviolet region (between 350 and 420 nanometers), can produce blue luminescence under excitation of GaInN near ultraviolet light LED, and has the characteristics of high luminosity, ultraviolet radiation resistance, and good chemical stability and thermal stability.

An object of the present invention is to provide a light emitting device which is high in emission intensity and stable, that is to say, a light emitting device in which when an LED or LD having an emission peak at 380 nm to 410 nm is used as an excitation light source of the light emitting device, the emission intensity of a red phosphor does not largely change to some deviation of the emission wavelength of the LED or LD to maintain not only brightness but also a balance at the time when mixed with a blue and green phosphors.

The present invention relates to a light emitting device characterized in that the device comprises a phosphor which has Eu³⁺ as a luminescent center ion, in which a minimum emission intensity within the excitation wavelength range of 380 nm to 410 nm in an excitation spectrum is 65% or more of a maximum emission intensity, and which has an emission efficiency at 400 nm of 20% or more, and a semiconductor light emitting element which emits light in the region from near-ultraviolet light to visible light.

The method for discriminating between benign and malignant prostate tumors relates to analyzing samples of blood, urine and tissue by fluorescence spectroscopy in order to detect the presence of naturally occurring molecules in the fluids and tissue that serve as biomarkers indicative of cancer in the human body. The analysis can be carried out based on fluorescence emission spectra, fluorescence excitation spectra and synchronous (emission and excitation) spectra of bio-samples. The detection, diagnosis, and follow-up and also discrimination between malignant and benign prostate tumors may be made by comparison of ratios of fluorescence emissions and/or excitation intensities of tryptophan, tyrosine, elastin, collagen, bile pigments, NADH, flavins and various species of porphyrins.

The present invention provides systems and methods for analyzing the excitation spectra of fluorescent particles in a flowing stream. The system uses a white light laser and color separation optics to provide a spatially-distributed, continuous color-spectrum excitation light system that is used to illuminate a region of a flowing stream. A particle that passes through the detection region traverses the full dispersed spectrum of excitation light, and the fluorescence emissions from the particle are continuously measured as it passes through the detection region. The measured fluorescence emissions at each wavelength of excitation light, which changes through full spectrum of the excitation light as the particle passes through the detection region, provides the excitation spectrum of the particle.

The current invention provides a persistent phosphor blend, along with techniques for making and using the blend. The persistent phosphor blend is made of at least one persistent phosphor combined with at least one other phosphor, where the excitation spectra of the one or more other phosphors overlap the emission spectra of the one or more persistent phosphors. The choice of the phosphors used allows the decay time and emission colors to be tuned for the specific application. In another embodiment, the invention provides a method for making persistent phosphor blends with tunable colors. In yet another embodiment, applications for such a persistent phosphor blend are provided.

A spherical phosphor includes a fluorescent substance having a maximum excitation wavelength of 400 nm or longer; and a transparent material containing the fluorescent substance, in which, in an excitation spectrum, an excitation spectral intensity in a wavelength region of from 340 nm to 380 nm is 50% or higher of an excitation spectral intensity at a maximum excitation wavelength. A wavelength conversion-type photovoltaic cell sealing material includes a light-permeable resin composition layer that contains the spherical phosphor and a sealing resin.

The invention discloses a method for preparing a high-power white LED with low color temperature and high color rendering property. In the method, fluorescent powder is excited by adopting an InGaN-based blue LED chip, wherein the fluorescent powder is a mixture of yellow fluorescent powder, green fluorescent powder and orange red fluorescent powder; both peak values of excitation spectra of the yellow fluorescent powder and the green fluorescent powder are matched with an emission spectrum of the InGaN-based blue LED chip; and the peak value of the emission spectrum of the green fluorescent powder is matched with the excitation spectrum of the orange red fluorescent powder. The yellow fluorescent powder and the green fluorescent powder are excited by the emitted light of the InGaN-based blue LED chip respectively, and the orange red fluorescent powder is excited by the emitted light of the green fluorescent powder, so that the method improves the photoluminescence conversion efficiency of the fluorescent powder. By reasonably regulating the ratio of the fluorescent powder, the method can ensure that the spectrum of the white LED consists of blue light, yellow light, green light and orange red light and has high continuity and high balance, and high luminous efficiency and the high color rendering property of the high-power white LED at a low color temperature are realized.

The invention discloses a tumor microvascular imaging instrument and a tumor microvascular imaging method. The tumor microvascular imaging instrument comprises an infrared confocal imaging part and a control part, wherein the infrared confocal imaging part comprises a near-infrared laser, a dichroscope, a two-dimensional scanning galvanometer, a scanning lens system, an imaging objective, a near-infrared fluorescence filter, a convergent lens, a pinhole and a detector; the scanning lens system is composed of a field lens and a cylindrical lens; the control part comprises a two-dimensional scanning control module which is used for controlling the two-dimensional scanning galvanometer, a signal amplification and acquisition module and a data processing and image displaying module; near-infrared quantum dots that a fluorescence excitation spectrum ranges from 1000nm to 1350nm and a fluorescence emission spectrum ranges from 1350nm to 1500nm are injected to blood vessels of a to-be-observed living body; and then a tumor part of the living body is observed under the tumor microvascular imaging instrument. According to the tumor microvascular imaging instrument and the tumor microvascular imaging method provided by the invention, complete three-dimensional imaging of tumor microvessels of the living body can be implemented with a high resolution.

A print medium is encoded with information bearing indicia. A transparent layer or substrate which receives the printed information during printing has a first surface, a second surface and a leading edge. A strip of tape is applied to the first surface. A machine readable information bearing indicia is applied to at least one surface of the tape strip. The indicia is formed by a pattern of fluorescent material which upon excitation by radiation of a given spectral excitation range emits radiation in a fluorescent spectral range. The tape reflects radiation in the given excitation spectral range and in the fluorescent spectral range. One type of indicia is a bar code pattern, although other types can also be employed.

The present invention is a method and system for reducing contamination in the resulting plasma of a weld produced by a fiber laser. The invention establishes the fiber laser in an optimal configuration for applying a high density beam to a weld material that eliminates spectral interference. The beam is applied in a narrow bandwidth of 1064 nm+/−0.5 nm in one operative condition using an inert shielding gas, preferably argon, in a cross-flow or controlled environment around the welding region to prevent contamination of the plasma forming in the weld region. The method is optimized by determining and avoiding the emission spectrum for the fiber laser and the cover gas or gasses as well as any particular excitation spectra for the weld material. The system can utilize a single laser input, or can utilize multiple lasers joined by coupling means and utilizing a switch to select one or more of the fiber lasers.

The method for lung cancer detection by optical analysis of body fluids relates to analyzing samples of blood, urine and sputum by fluorescence spectroscopy in order to detect the presence of naturally occurring molecules in the fluids that serve as biomarkers indicative of cancer in the human body. The analysis can be carried out based on fluorescence emission spectra, fluorescence excitation spectra and synchronous (emission and excitation) spectra of bio-samples. The early detection and diagnosis of lung cancer may be made by comparison of ratios of fluorescence emissions and/or excitation intensities of tryptophan, tyrosine, elastin, collagen, bile pigments, NADPH, flavins and various species of porphyrins.

The invention relates to a method for the separation of molecules having different excitation spectra, which form components of a gas. The molecules are excited by laser pulses in a way that the molecules to be separated are transferred into a state of excitation due to multi-absorption of energy quanta from laser pulses, and in which they are extracted from the gas so that they exist in a composition determined by the form of the laser pulses. According to the invention, the laser pulses are formed by an iterative process in which each laser pulse varies in its form depending on the extracted molecules' composition after their absorption of energy quanta.

A blue-fluorescence powder comprises a material with a general formula of Mg (1-x-y) SryAl2O4: Eux, wherein x is the mole number of europium atom and is less than or equal to 0.005 and more than or equal to 0.10, y is the mole number of strontium atom and is less than or equal to 0.01 and more than or equal to 0.14. A preparation method of the blue-fluorescence powder comprises the following steps of pretreating raw materials, blending, sintering, washing and preparing the blue-fluorescence powder. The blue-fluorescence powder prepared by the preparation method is tested by an X-ray powder diffractometer and a PE spectrofluorimeter and is observed by an environmental scanning electronic microscope, the test and the observation results show that the excitation spectrum of the prepared fluorescence powder adopts a wide band spectrum between 200 nm and 450 nm, the center wavelength of the excitation spectrum is 330 nm, the emission spectrum is a band spectrum positioned between 400 nm and 550 nm under the excitation of 330 nm and 365 nm ultraviolet lights, the center wavelength is 463 nm and is consistent with the spectrum of the common blue fluorescence powder, thereby the fluorescence powder prepared by adopting the preparation method is the blue-fluorescence powder.

The invention relates to a dual-axis laser differential confocal LIBS (laser-induced breakdown spectroscopy), RS (Raman spectroscopy) and MS (mass spectrometry) imaging method and device and belongs to the technical field of confocal microscopy imaging, MS imaging and spectral measurement. A double-axis differential confocal microscopy imaging technology and spectrum and MS detection technologies are combined, a sample is subjected to high spatial resolution morphological imaging through micro focusing spots, processed with a super-resolution technology, of a dual-axis differential confocal microscope, an MS detection system is used for performing MS detection on electrically-charged molecules or atoms in a microcell of the sample, a spectrum detection system is used for performing microcell spectrum detection on focusing spot excitation spectra including Raman spectra and LIBS spectra, and high spatial resolution of the microcell of the sample and high-sensitivity imaging and detection of components and morphology are realized through advantage complementation of laser multi-spectrum detection and structural fusion. A brand new effective technological approach can be provided for imaging and detection of material components and morphology in the fields such as biology, materials and the like.