1228 results about "Red fluorescence" patented technology

The device contains optical semiconductor as light source of blue light. Fluorescent layer is glued on the optical semiconductor. The fluorescent layer is prepared by even mixing red and green luminescent powders and transparent glue. Red fluorescence in fluorescent layer is emitted light different from blue spectrum (wavelength) excited by blue light, and green fluorescence in fluorescent layer is emitted light different from blue spectrum excited by blue light. Mixing the said two different spectrums (wavelengths) and unexcited blue spectrum form white light. Fluorescent layer mixed from red or jacinth and green is able to influence wavelength of blue light source, emitting light different from blue light so as to obtain white light illuminator generating pure white light with higher intensity.

The invention provides an optical coating composition, a fluorescent optical membrane and a preparation method thereof. The optical coating composition comprises the following components in parts by weight: 0.01-3 parts of red fluorescence quantum dot material, 1-40 parts of green fluorescence quantum dot material, 0-90 parts of solvent, 0-20 parts of photodiffusion agent, 5-60 parts of film-forming material and 0-10 parts of film-forming assistant. The weight ratio of the red fluorescence quantum dot material to the green fluorescence quantum dot material is (1:100):(1:10). The optical coating composition provided by the invention can be applied on a transparent substrate or existing optical membrane surface to form a fluorescent optical membrane. The fluorescent optical membrane formed by the optical coating composition can achieve the effect of enhancing the displayable color range of the emergent light source.

The invention discloses red fluorescent powder used for a white LED. The chemical expression is that R<1>2R<2>1-x(R<3>O4) (R<4>O4) : xEu<3+>, wherein, R<1> is one, two or more of Li<+>, Na<+>, K<+>, Rb<+> and Ag<+>; R<2> is one, two or more of La<3+>, Gd<3+>, Y<3+>, Pr<3+>, Sm<3+>, Eu<3+>, Bi<3+>, B<3+> and Al<3+>; R<3> is P<5+>, P<5+> and V<5+>, P<5+> and Nb<5+>, or P<5+> and V<5+> as well as Nb<5+>; R<4> is W<6+> and Mo<6+>; x is 0.005 to 1.0. The preparation method of the red fluorescent powder comprises the following steps: firstly, raw material containing R<1>, R<2>, Eu<3+>, R<3> and R<4> is porphyrized and evenly mixed, dried and porphyrized again and positioned into a muffle to be sintered; secondly, the red fluorescent powder is obtained after post-processing. The red fluorescent powder of the invention can be effectively excitated by blue light, black light or ultraviolet light, the light and thermal stability is good, the red luminous intensity is high, and the color purity is ideal.

The invention discloses an excited light regulated red-green emitting rare earth up-conversion nanoparticle and a preparation method thereof. The excited light regulated red-green emitting rare earthup-conversion nanoparticle emits red fluorescence under excitation of a 980 nm laser and emits green fluorescence under excitation of a 800 nm laser; the nanoparticle is a four-layer core-shell structure and comprises, from the inside to the outside, an activator layer, an energy transfer agent layer, a sensitizer layer, and a passivation layer; and chemical expression is NaErF4:Yb, Tm@NaYF4:Yb@NaNdF4:Yb@NaYF4. By adjusting doping concentration of different ions in the core-shell structure of the rare earth up conversion nanoparticle, the rare earth up-conversion nanoparticle emits different colors of fluorescence along with change of wavelength of the excited light; the rare earth up-conversion nanoparticle prepared by the invention has the characteristics of simple preparation, easy availability of raw materials, excellent optical properties and the like, and has broad application prospects.

The invention relates to a dual-emission ratio-type quantum dot fluorescence probe for visual detection of aspirin, a preparation method and an application thereof and belongs to the technical field of preparation of material and detection of content of medicines. The preparation method of the probe includes following steps: preparing a precursor NaHTe solution from sodium borohydride, tellurium powder and water under an ultrasonic environment; adding the precursor to an aqueous solution of CdCl2.2.5H2O in the presence of thioglycollic acid; carrying out a reflux reaction with a nitrogen protecting condition to obtain required green fluorescence quantum dot and red fluorescence quantum dot; by means of a sol-gel method, wrapping the red fluorescence quantum dot with silicon spheres with amino group being connected; dispersing a green fluorescence quantum dot solution and the red fluorescence quantum dot wrapped with the silicon spheres in an MES buffer solution with addition of an EDC/NHS solution; and carrying out a reaction at room temperature in a dark place to obtain the dual-emission ratio-type quantum dot fluorescence probe. The dual-emission ratio-type quantum dot fluorescence probe is used in detection of the content of the aspirin through fluorescence quantitation and visualized analysis. The quantum dot fluorescence probe is quite good in optical performance and stability and has a capability of visualizedly detecting the aspirin.

The invention is a method for using the secondary laser method to generate the white light source, it uses light source which can emit out ultraviolet and purple light (wavelength is 360-420nm), such as the illuminant diode (LED) and radium (LD), excites the blue fluorescence powder to emit out the primary excited light spectrum of the wideband whose main peak is blue light, then, the primary excited light spectrum excites the yellow fluorescence powder whose stage energy is lower, the secondary excited light spectrum can be emitted out whose main peak is yellow, through adjusting the proportion of the two kinds of fluorescence powder, the primary excited light spectrum and the secondary excited light spectrum can generate the complementary effect, and generate the whole spectrum white light; additional, there also can add in the red fluorescence powder and the green fluorescence powder excited by the ultraviolet light or the purple light, in order to adjust the color and the color temperature of the white light, and it can adjust the light source of other different color.

The invention discloses a preparation method of a double-emission carbon-based nano probe prepared based on an electrostatic interaction induced self-assembling method and application of a product ofthe preparation method to in-vivo and in-vitro temperature detection of organisms, and belongs to the technical field of colorimetric fluorescence detection. The preparation method comprises synthesisof blue fluorescence carbon dots (B-CDs) which have no temperature sensitivity and negative charges on surfaces, preparation of red fluorescence carbon dots (R-CDs) which have temperature sensitivityand positive charges on surfaces and preparation of the double-emission carbon-based nano probe. According to the double-emission carbon-based nano probe obtained by the preparation method, the double-emission carbon-based nano probe has different responsiveness aiming at different temperature and has different compound temperature color changes; the double-fluorescence emission nano probe can beused for colorimetrically detecting in-vivo and in-vitro temperature of the organisms by naked eyes, and has high sensitivity (0.93 percent/DEG C) and operation repeatability, so that the double-fluorescence emission nano probe provides convenience for biological imaging, temperature sensing, environment monitoring, food safety and the like.

The present invention discloses red phosphor powder and a preparation method thereof, wherein the chemical structure formula of the red phosphor powder is Ca1-x-ySrxEuyLzAl3O[delta]N4-[delta], L is at least one selected from Li, Na and K, X is more than or equal to 0 and is less than 1, Y is more than 0 and is less than or equal to 0.1, Z is more than or equal to 0.5 and is less than or equal to 1, and [delta] is more than 0 and is less than 0.5. According to the present invention, the trace oxygen is introduced to balance the charge so as to improve the light emitting efficiency of the synthesized red phosphor powder; the phosphor powder can emit narrow brand visible light having the peak value of 630-680 nm under excitation of 400-500 nm violet light or blue light so as to improve the color rendering index of the product and meet the application requirements of the backlight and the display product on the narrow peak emission phosphor powder; and the red phosphor powder is prepared through the multi-step nitriding reaction method of the composite hydride dehydrogenation nitriding, and can be used for high color rendering index illumination, and backlighting and display devices.

The invention discloses a probe reagent for concurrent selection and determination of multiple metal ions, and preparation and appliance, and belongs to the field of organic synthesis and analytical chemistry. Tri (2-aminoethyl) amine serves as a parent, wherein rhodamine B is connected to an amino chain, 2-hydroxy-1-naphthaldehyde groups are connected to other two amino chains respectively, and thus a tripod structured rhodamine-hydroxyl naphthalene derivative probe is prepared. In 1,4-dioxane/water (19/1, v/v, pH=7) solution, the probe respectively detects Cu2+, Co2+ and Fe3+ by utilizing rate absorption of different wavelengths, and the detection does not interfere with each other; in acetonitrile/water (19/1, v/v) solution, fluorescence emission of different wavelengths under different pHs is utilized, the probe respectively detects Zn2+, Al3+, Hg2+ and Cu2+, and the detection does not interfere with each other; under an ultraviolet lamp of 365 nm, Zn2+, Al3+ and Hg2+ are detected to show blue, pink and orange red fluorescence respectively, and through -Zn2+ mixture detection by the probe, Cu2+ shows blue fluorescence vanishing. The probe structure is as follows.

The invention discloses a bicolor Eu-MOFs/CDs fluorescent material as well as preparation and an application thereof. Europium ions, trimesic acid and carbon quantum dots are used as raw materials, and the bicolor fluorescent material is prepared through heat treatment in a solvent prepared by mixing N,N-dimethylformamide, distilled water and cyclohexanol. Under irradiation of ultraviolet lamps, the material can emit red fluorescence when dispersed in organic solvents and can emit blue fluorescent when dispersed in water, so that fluorescent colorimetric sensors for measuring water content in organic solvents can be prepared from the material, the prepared sensors are high in sensitivity, good in stability and low in cost and have higher population value and brighter application prospect.

The invention discloses a preparation method of a rare earth complex/polymer naocomposite plastic film. The method comprises the following steps: reacting an aqueous europium chloride solution having a concentration of 0.1mol/L with a first ligand TTA, and using TPPO as a second ligand to synthesize Eu(TTA)3TPPO(ETT); and respectively dissolving Eu(TTA)3TPPO(ETT) having a weight percentage of 0.3wt% and low-density polyethylene in an organic solvent to prepare a nanometer rare earth complex light conversion film, and utilizing the small size effect of Eu(TTA)3TPPO(ETT) to make Eu(TTA)3TPPO(ETT) have a good compatibility in the low density polyethylene in order to obtain a uniform and transparent composite film. The film absorbs ultraviolet light in daylight and converts the ultraviolet light into red light helpful for the growth of plants, so the light conversion effect is performed. A polymer extrusion molding technology can also be utilized in the invention to add 0.3wt% of the nano-europium rare earth complex to a low density polyethylene master batch in order to obtain a uniform and transparent polymer film, and red fluorescence of the polymer can be obviously seen at ultraviolet light (365nm).

The invention discloses a method for preparing polychromatic luminous nanocrystalline of monodisperse NaYF4, belonging to the technical field of the inorganic nanophase material preparation. The prepared NaYF4 nanocrystalline is in a uniform hexagonal shape, the diameter of the NaYF4 nanocrystalline is about 40nm, and the width of NaYF4 nanocrystalline is 25nm. The NaYF4 nanocrystalline is distributed in a monocrystal mode. The NaYF4 nanocrystalline has favorable monodispersion and strong upconversion fluorescence performance. Through adjusting the doped chemical and the proportion of rare earth, the NaYF4 nanocrystalline capable of sending different colors of fluorescence, such as red fluorescence, yellow fluorescence, blue fluorescence, green fluorescence, and the like under the excitation of 980 nm infrared light is debugged, and the NaYF4 nanocrystalline is used in the research on biomedical imaging.

The invention aims to develop a flow-cytometry-based method for rapidly measuring heterotrophic bacteria in a eutrophic lake. The method is a flow-cytometry-based bacterium counting method. The method comprises the following steps of fixing a sample, performing ultrasonic processing, filtering, performing SYBR Green I dyeing, detecting the heterotrophic bacteria by utilizing a flow cytometer, and acquiring forward and lateral scattering light, an SYBR Green I green fluorescence signal and a chlorophyll a red fluorescence signal of autotrophic plankton, wherein the SYBR Green I green fluorescence signal is used for setting a threshold value; and eliminating the influence of the nannoplankton on bacterium detection by utilizing the forward and lateral scattering light, separating the plankton from abiological particles and cellular debris according to the intensity of the SYBR Green I green fluorescence signal, and separating the bacteria from phytoplankton according to the intensity of the chlorophyll a red fluorescence signal of the autotrophic plankton, thereby obtaining the accurate number of the heterotrophic bacteria. The method has the time-saving and labor-saving effects, the large-scale ecological survey can be developed, and the counting precision and accuracy of the bacteria are improved.

The invention discloses amphipathy photoswitch fluorescent polymer nano particles and a preparing method of the amphipathy photoswitch fluorescent polymer nano particles. Methyl methacrylate, polymerizable green fluorescence dye and a polymerizable photochromic compound are taken as monomers, hexadecane is taken as hydrophobe, a polyoxyethylene macromolecular chain transfer reagent is taken as a surface active agent, a one-step reversible addition-fragmentation chain transfer (RAFT) miniemulsion polymerization method is adopted for preparing the novel amphipathy photoswitch fluorescent polymer nano particles. The amphipathy photoswitch fluorescent polymer nano particles can emit intense macroscopic green or red fluorescence under irradiation of visible light and ultraviolet light, and have fast photoresponse capacity and good repeated fluorescence reversible switch performance. The amphipathy photoswitch fluorescent polymer nano particles have wide application prospects in the fields of cell imaging, bioanalysis, optical storage and the like.

The invention consists of transparent base plate, anode layer and organic functional layer. The light emitting layer in organic functional layer comprises main body material, blue phosphorescence fluorochrome. The doping concentration of phosphorescence fluorochrome is: 1-20wt%. The doping concentration of fluorochrome is 0.05-1wt%. Due to increasing the utilization of fluorochrome, high efficiency red fluorescence is obtained. Combining blue fluorescence emitted from fluorochrome the high efficiency phosphor photo- activation fluorescence white light device is obtained.

The invention relates to a blue-excited red fluorescent material and a preparation method thereof, belonging to the field of luminescent materials. The blue-excited red fluorescent material has the following chemical expression: Ca1+d-x-mAmRxBi2Ta2-nBnO9:fC, wherein the R is selected from one or more rare earth elements of Pr, Sm, Eu and Lu; the A is selected from one or more than one of Sr, Ba, Mg, Zn and Cu; the B is selected from one or two of Nb and V; the S is selected from one or more than one of Li, Na, K, Ti, Ag, B, Al, Ga and In, the x is not less than 0.00001 and is not more than 0.1; the m is not less than 0 and is more than 0.99; the n is not less than 0 and is not more than 1.99; the d is not less than 0 and is not more than 0.1; and the f is not less than 0 and is not more than 0.1. The blue-excited red fluorescent material not only has the properties of piezoelectricity, ferroelectricity and dielectricity, but also has the characteristic of blue-excited red emission, belongs to a photoelectric multifunctional material and can be widely applied to the fields of white light LED (Light Emitting Diode), optoelectronic integration, micro electromechanics, photoelectric sense, and the like.

The invention discloses double-perovskite structured red fluorescent powder as well as a preparation method and application thereof, belonging to the field of fluorescent materials. The chemical formula of the fluorescent powder can be shown as Ln2-xAMO6:xEu and meets the following conditions: Ln is one, two or three of La, Gd and Y; A is one, two or three of Li, Na and K; M is one, two or three of Sb, Nb and Ta; and Eu is a luminescent center and is doped in the Ln position and the doping value x is 0.01-1.0. The fluorescent powder disclosed by the invention can emit fluorescence of 570-640 nm under the excitation of a green light chip (528-533 nm), a blue light chip (460-470 nm) or a near-ultraviolet light chip (390-399 nm), and red fluorescence is of 600-620 nm. The fluorescent powder can be used for white LED (light-emitting diode) and related display and lighting devices, has a simple preparation process, stable chemical properties and excellent luminescent performance, and is ideal fluorescent powder used for white LED.

The invention discloses a preparation method of golden nanoclusters emitting red fluorescence. The method is characterized by comprising the following steps: separately preparing a chloroauric acid solution and a keratin solution, slowly adding the chloroauric acid solution into the keratin solution, and then fully stirring the mixture to uniformly mixing the solutions to obtain a faint yellow solution; regulating the pH value of the solution to 8-12; placing the solution at 25-60 DEG C to incubate to obtain a brown golden nanocluster solution; and pouring the golden nanocluster solution intoa dialysis bag to be dialyzed, wherein the molecular weight cut-off is 3500Da, and then freezing and drying the mixture to obtain the golden nanocluster particles. By taking keratin as a stabilizer and a reducer and tetrachloroauric acid as a precursor to synthesize fluorescent golden clusters, the prepared golden nanoclusters emit red fluorescence, the maximum excitation wavelength is 520nm and the maximum emitting wavelength is 670nm. The keratin has rich sulfydryl, is good in stability, and meanwhile, has an effective reducing capacity.

The invention discloses a reticular cell detect reagent and the testing method thereof, and the reagent and the method can be applied to an apparatus based on the streaming technical principle to count accurately the analyzing reticular cell in blood specimen. The reagent and the method of the invention adopt a novel red fluorescence excitation dye which is used for marking RNA in the reticular cell, and the rapid sign of RNA in the reticular cell can be realized under the environmental temperature through a matched sphericize reagent system.

The invention provides a red fluorescence gold nanocluster as well as a preparation method and an application thereof and belongs to preparation and applications of fluorescence nano materials. According to the preparation method, cheap egg white is used for rapidly reducing and coating HAuCl4, and gold nanocluster AuNCs@EW giving red fluorescence is synthesized. The preparation method is simple, rapid and low in cost. The prepared nanocluster can be used as fluorescent dye, can be used for detecting mercury ions and further can be used for detecting GSH (glutathione).

The present disclosure relates to a toner design for a clear UV red fluorescence toner having a high lanthanide complex pigment loading, including methods of making the fluorescence toner using a saccharide or a sugar acid to avoid complexation of lanthanide ions from the pigment, with lower aggregation and coalescence temperatures in the preparation of toner particles, where the particles exhibit a narrow size distribution and good xerographic performance.