21 results about "White emission" patented technology

The present application belongs to the technical field of luminescent materials, and relates to a cerium metal-organic framework for white light emission and a preparation method and application thereof, to solve the problems that traditional white light LED needs to utilize multiple metal composites or multiple matrix composites and be sintered at high temperature to obtain multi-color fluorescent powder, and needs to be matched with corresponding LED chips to emit white light, and the corresponding preparation conditions are complex and the cost is high. 4,4'-(1H-pyrazole-1,3-diyl)dibenzoic acid is added into N,N-dimethylformamide; cerium salt is added into water; then the above two solutions are mixed and nitric acid is added, and hydrothermal reaction is carried out to obtain the cerium metal-organic framework material for white light emission. The preparation method disclosed by the present application is simple and has a high yield (>=82%). The prepared cerium metal-organic framework material can realize full-spectrum white light emission of a single matrix and a single metal ion, and the luminescent color coordinate value is close to the white light emission region (0.33, 0.33).

The invention belongs to the technical field of nano materials, and discloses a preparation method of an Au nano material with a layered hybrid superlattice structure. According to the method, a coordination confinement synthesis strategy is adopted, 4-mercaptobenzoic acid is taken as a structure-directing agent, and the organic-inorganic alternating layered superlattice structure is successfully prepared under the condition of CO weak reduction by utilizing a strong coordination bond formed by sulfydryl of 4-mercaptobenzoic acid and gold and a pi-pi conjugate synergistic effect of a benzene ring and combining a soft template confinement effect of octadecylamine. The superlattice material has a long-range disordered amorphous structure and an adjustable interlayer spacing (2.9 to 4.7 nm), and shows the white light emission characteristics of wide-spectrum ultraviolet-visible absorption (250 to 600 nm) and adjustable color temperature (3200 to 6500 K). According to the invention, a quantitative structure-function relationship of interlayer spacing-ligand metal interaction-optical performance is established, effective regulation and control of intersystem crossing process and phosphorescence lifetime from microsecond to millisecond magnitude are realized, and an innovative solution is provided for solving the problem of metal-organic layer interface compatibility; and an important material platform and theoretical support are provided for developing a novel flexible photoelectric device.

The invention relates to fluorescent powder based on ultraviolet excitation near-white light, in particular to Sm < 3 + > doped Sr9La (VO4) 7, the chemical formula is Sr9La (1-x) Smx (VO4) 7, x is larger than 0 and smaller than or equal to 0.25, the fluorescent powder can achieve near-white light emission under ultraviolet excitation, the emission color is adjustable along with the temperature, visual non-contact temperature measurement can be achieved through color change within the range of 298-573 K, and sensitivity is high. A high-temperature solid-phase method is adopted for preparation, the process is simple, raw materials are easy to obtain, and the purity requirement is easy to meet.

The application relates to the technical field of inorganic photoluminescence materials, and discloses a rare earth doped layered stannate-based white light fluorescent powder material and a preparation method thereof, a chemical molecular formula of which is A1-xSn2-xO6:Eu3+, wherein 0 < x <= 0.05, A is one or more divalent alkali earth metal ions in Ca, Sr and Ba, and is doped in different proportions, the A provides a red light emission component, the A provides a blue and yellow light emission component, the emission intensity of the red light and the blue and yellow light can be adjusted by regulating and the doping proportion, the ionic radius of the A is similar to that of the A, and the A substitutes the lattice position. Through the synergic doping of the A and the A and the proportion regulation, the charge compensation and the lattice position optimization of the A and the A are combined, the accurate matching of the red light and the blue and yellow light emission intensity of the fluorescent powder is realized, white light emission effects with excellent color rendering and stable color tone are obtained, and the problems of red light loss or light emission efficiency decay caused by the mixing of multi-color fluorescent powder in traditional white light LED fluorescent powder are effectively overcome.

The application provides a white light phosphor powder based on copper-iodine organic hybrid clusters and a preparation method thereof, and has a structure shown in formula I. The structure of the white light phosphor powder in the application is that Cu4I4 is used as an inorganic core, and copper atoms are coordinated with nitrogen and phosphorus atoms on ligands to form a stable and unique cluster structure. The light emitting mechanism of the cluster is charge transfer from the inorganic core to the ligand, and the simple core and the ligand cooperate with each other to form degenerate emission energy levels, so that white light emission with double wide peaks from 400 to 800 nm is realized. The light emitting quantum yield reaches 97.8%. The material also exhibits excellent stability, and the thermal decomposition temperature is as high as 265 DEG C. The material also has low thermal quenching, and still maintains more than 80% of the original light emitting quantum yield under the condition of 240 DEG C. The application also provides an application of the white light phosphor powder based on copper-iodine organic hybrid clusters. The white light phosphor powder is applied to the field of solid state lighting, and has significant advantages and application prospects.

This invention discloses a trapezoidal composite fluorescent glass-ceramic for laser illumination and its preparation method. The composite fluorescent glass-ceramic comprises a trapezoidal fluorescent glass and a high thermal conductivity ceramic coating on the outer layer of the fluorescent glass. The trapezoidal fluorescent glass is formed by melting and casting waste glass doped with luminescent ceramic powder, red phosphor, and high thermal conductivity powder. The composite glass-ceramic prepared by this invention achieves high-brightness white light emission under excitation by a 460nm blue LD chip, with a color rendering index of 82-91, and can withstand an excitation power density of 40W / mm². 2 ~55W / mm 2 Its luminous efficacy is 206–265 lm / W, and its thermal conductivity at room temperature is 18–29 Wm. ‑1 k ‑1 .

The invention discloses an ionic coumarin-based rare earth complex as well as a preparation method and application thereof, and belongs to the field of organic photoelectric functional materials. 3-acetyl-4-hydroxycoumarin and a methoxy substituted derivative 4-hydroxy-6-methoxy-3-acetocoumarin thereof are used as organic antenna chromophores; triethylamine is used as a counter cation to prepare a series of ionic high-luminescence rare earth complexes; wherein the Tb < 3 + > complex 2 shows the highest luminous efficiency value of the coumarin-based rare earth complex due to the proper triplet excited state energy level of a Coum ligand and the low symmetric D2d triangular dodecahedron spatial configuration of the Coum ligand; the edge of an excitation band of the OMe series complex 6-9 is widened to a visible region, and the obviously widened excitation window is combined with the ionic charge characteristics of the OMe series complex 6-9, so that the complex becomes a potential candidate for visible light activation application which is safer and deeper in penetration; the Dy < 3 + > complex 9 shows double emission characteristics of OMe-Coum blue fluorescence and Dy < 3 + > characteristic yellow phosphorescence, and high-quality single-component composite white light emission is realized by fusing the OMe-Coum blue fluorescence and the Dy < 3 + > characteristic yellow phosphorescence.

A class of metal halide-based metal-organic frameworks (MOFs) materials with multicolor tunable long-lasting emission and white light properties were synthesized by self-assembly of 15-crown ether-5 (CE) ligands and metal halide salts (CdX2), resulting in three complexes (15-5-CdCl2, 15-5-CdBr2, and 15-5-CdI2). In the solid state, the complexes (15-5-CdCl2, 15-5-CdBr2, and 15-5-CdI2) all exhibited near-standard white light emission under 340 nm ultraviolet radiation at room temperature, with CIE coordinates of (0.28, 0.32), (0.31, 0.39), and (0.30, 0.34), respectively. Simultaneously, they exhibit excitation-dependent room-temperature phosphorescence (RTP) ranging from blue / cyan to green / yellow, with 15-5-CdCl2 and 15-5-CdBr2 exhibiting multicolor tunable and visible light luminescence (LPL) with time-resolved luminescence lifetimes as high as 1-2 seconds. Single-crystal X-ray diffraction analysis and theoretical calculations indicate that the bright LPL of 15-5-CdCl2 and 15-5-CdBr2 originates from the aggregation state induced by the 15-crown ether-5 ligand and halogen bonds. The LPL obtained in this way can be widely used in lighting and display devices, optical recording devices, biological imaging, security systems, and other fields.

The invention belongs to the technical field of electroluminescent devices, and particularly relates to a monomolecular white organic electroluminescent device and a preparation method thereof. The invention innovatively provides a monomolecular white light organic compound with dual thermal activation delayed fluorescence characteristics, and monomolecules of the monomolecular white light organic compound adopt a face-to-face receptor-donor-receptor (A-D-A) spatial arrangement mode. The two sides of a donor in the compound are connected with an acceptor to form a stable space conjugated system, intramolecular interaction is ingeniously constructed, intramolecular charge distribution is effectively optimized, and the luminescent property of the material is remarkably improved. The compound shows excellent aggregation-induced emission characteristics, emits dark blue light in a dispersed state and emits yellow light in an aggregation state, and efficient and stable white light emission can be realized by accurately regulating and controlling the molecular aggregation state. As a core light-emitting material of an organic material layer in a monomolecular white organic light-emitting device, the compound has extremely high application value and potential and has a wide market prospect.

The application discloses a gallate-based blue light-emitting material applicable to a plant light supplement lamp, a preparation method and application of the gallate-based blue light-emitting material, and a chemical general formula of the light-emitting material is Ca 1‑x Ga4O7:xCd 2+ , wherein x is 0.003-0.007. The gallate-based blue light-emitting material takes CaGa4O7 as a matrix, Cd 2+ is a doping ion, Cd 2+ cannot form a new light-emitting center in CaGa4O7, and only plays a role in enhancing blue light emission of the matrix. The light-emitting material produces a wide peak with a peak value of 445 nm under ultraviolet excitation, generates blue-white emission, and the emission band is highly coincident with a band required by plant growth, so that chlorophyll synthesis can be promoted, stem and leaf growth of plants is beneficial, the plant light supplement demand can be met, and the optimal afterglow duration can reach nearly 2 hours. The light supplement can still be carried out after stopping excitation, and energy consumption is reduced.

An imaging device includes a body having a first end portion configured to be held in a user's hand and a second end portion configured to direct light onto a surgical margin. The device includes at least one excitation light source configured to excite autofluorescence emissions of tissue cells and fluorescence emissions of induced porphyrins in tissue cells of the surgical margin. A white light source is configured to illuminate the surgical margin during white light imaging of the surgical margin. The device includes an imaging sensor, a first optical filter configured to permit passage of autofluorescence emissions of tissue cells and fluorescence emissions of the induced porphyrins in tissue cells to the imaging sensor, and a second optical filter configured to permit passage of white light emissions of tissues in the surgical margin to the imaging sensor. Systems and methods relate to imaging devices.

The invention relates to a method for preparing a lead-free double perovskite nanocrystal with white light emission by an ultrasonic chemical method, and belongs to the field of inorganic semiconductor luminescent materials. The chemical composition of the lead-free double perovskite nanocrystalline is Te: Cs2ZrCl6. The preparation method comprises the following steps: (1) preparing Te: Cs2ZrCl6 fluorescent powder by adopting a solvothermal method; (2) dissolving the fluorescent powder in the step (1), ligand oleic acid and didodecyl dimethyl ammonium chloride in 1, 3, 5-trimethylbenzene neutralized hydrochloric acid to prepare a precursor solution; and (3) putting the precursor solution in the step (2) into a tip ultrasonic reactor for ultrasonic reaction, adding ethyl acetate for purification, and dispersing the centrifuged precipitate into n-hexane, thereby obtaining the product. The ultrasonic chemical method is simple in preparation process and short in production period, and the prepared Te: Cs2ZrCl6 nanocrystal has high quantum efficiency and white light emission and has good application prospects in the field of solid-state illumination.

This invention provides a light source for projectors that can broaden the color gamut of projected images and improve color reproduction. [Solution] The spectroscopic element 4 spectrally separates the red laser light R, green laser light G, and blue laser light B emitted from the red laser light source 1R, green laser light source 1G, and blue laser light source 1B, respectively, and emits them in different directions. The diffusion member 62 is formed in one region of the base member 61 and diffuses and reflects the incident red laser light R and green laser light G. The fluorescent / diffusing member 63 is formed in another region of the base member 61 and includes a phosphor that is excited by a portion of the incident blue laser light B to emit yellow light Y, and a diffusion material that diffuses and reflects the other portion of the blue laser light B. The focusing element 5 mixes the red laser light R and green laser light G reflected by the diffusion member 62, the yellow light Y emitted from the fluorescent / diffusing member 63, and the blue laser light B reflected by the fluorescent / diffusing member 63 and emits it as white light W.

This invention provides a highly efficient method for preparing white-light graphene quantum dots, comprising: adding 1,3,6-trinitropyrene to a polytetrafluoroethylene reaction vessel, adding dimethyl sulfoxide (DMSO) solvent, ultrasonically dispersing the mixture, and then carrying out a solvothermal reaction. After the reaction vessel is cooled to room temperature, the solution is rotary evaporated to dryness, finally obtaining black graphene quantum dot powder with white fluorescence. This invention successfully solves the core problem of simultaneously achieving "high-efficiency preparation" and "high-performance white light emission," resulting in a product with excellent overall performance.

The invention provides an optical camera communication method based on RGB (red, green and blue) channel diversity reception, which abandons a traditional demodulation mode only based on brightness information, fully utilizes the color sensitivity characteristic of a CMOS (complementary metal oxide semiconductor) image sensor to optical signals with different wavelengths, separates a white light LED (light-emitting diode) emission signal into mutually independent R, G and B color channels at a receiving end, and improves the communication efficiency of the optical camera. And the signals are respectively received and processed. By introducing an RGB channel diversity receiving mechanism, the adaptability of the system to light source spectral characteristic changes and complex illumination conditions is improved, and thus the reliability and robustness of the optical camera communication system are improved.

The invention belongs to the field of novel display, and discloses a vacuum evaporation vertical stacking perovskite light-emitting diode and a micro display chip application thereof, the vacuum evaporation vertical stacking perovskite light-emitting diode takes a CMOS (Complementary Metal Oxide Semiconductor) driving circuit board as a substrate, and is formed by vertically connecting a plurality of single-junction perovskite LED devices in series through a charge generation layer; all the single-junction perovskite LED devices can integrally generate white light emission with mixed colors; all the single-junction perovskite LED devices and the charge generation layer are formed through in-situ vacuum evaporation, and no solution is involved; in addition, a red light filter, a green light filter and a blue light filter are respectively arranged on the white light unit of the white light emission, and the arrangement mode is consistent with the driving arrangement mode of the CMOS driving circuit board. The perovskite micro-display chip is prepared in situ through a full vacuum evaporation process, the process can be compatible with an existing commercial production line, the full-color perovskite micro-display chip can be achieved without a fine mask, and the problems that existing micro patterning is difficult and full-color patterning is difficult can be effectively solved.

The application belongs to the technical field of nanometer materials, and particularly relates to a preparation method of carbon quantum dots capable of emitting white light under excitation of ultraviolet light. The carbon quantum dots are prepared by taking a small-molecular-weight polymer and an aniline chemical as a precursor, and a crude product containing the carbon quantum dots is prepared under hydrothermal reaction. The product is collected by a purification method such as dialysis and freeze-drying, and the carbon quantum dots capable of emitting white light under excitation of ultraviolet light are obtained. The carbon quantum dots prepared by the application have a large half-peak width and multiple emission sites, so that the material can emit stable white light.

The application discloses a high-color-rendering-index and high-luminous-efficiency fluorescent conversion composite material for laser lighting and a preparation method thereof. The fluorescent conversion composite material is composed of a lens-shaped fluorescent ceramic and a fluorescent silica gel layer coated on the surface of the fluorescent ceramic. The fluorescent ceramic emits yellow-green light under excitation of blue excitation light. The fluorescent silica gel layer emits red light under excitation of the blue excitation light. The lens-shaped fluorescent ceramic is prepared by using a gel injection molding method, and then a red fluorescent silica gel layer is coated on the surface of the lens-shaped fluorescent ceramic. After drying, the fluorescent conversion composite material is obtained. The composite fluorescent material prepared by the application realizes high-brightness white light emission under excitation of a 455nm blue light LD chip, has a luminous efficiency of 190-260lm / W, a color rendering index of 90-96, and is simple to prepare and easy to industrialize.

A milking robot (1) for dairy animals is provided, said milking robot being equipped with milking means (3), a robotic arm (2) for connecting the milking means, a detection device (4) for determining teat positions, and a controller (10). The detection device comprises a first source (16) for the emission of broadband light, in particular white light, into a solid angle and an optical camera (17) for capturing images with the emitted light. The controller is configured to control a behaviour of emission of said broadband light depending on a criterion which at least determines that the controller increases the light intensity emitted by the first source, at least into part of said solid angle, only at a predetermined minimum ambient illumination. This prevents the dairy animals from being disturbed by flickering light in dark conditions. On the other hand, the additional light ensures more reliable images if the environment itself is already (to some extent) light, and the animals are therefore no longer disturbed as a result.

The application relates to the field of supramolecular fluorescent materials, in particular to a preparation method and application of a temperature-stimulated supramolecular artificial light capturing system. The preparation method of the supramolecular artificial light capturing system comprises the following steps: under N2 protection, K2CO3 and the compound 1 are added into a flask provided with a magnetic stirrer, acetonitrile is used as a solvent, the compound 2 is slowly added dropwise, and the reaction is stirred at room temperature overnight; after the reaction is completed, the stirring is stopped, the organic phase is collected, dried, spin-dried by a rotary evaporator, column chromatography is carried out, the spin-dried product is collected, and the M in the form of sticky oil is obtained; the M is added into distilled water, and self-assembly is driven by hydrophilic and hydrophobic forces. The application discloses a preparation method and application of a new fluorescent adjustable and temperature-stimulated high-efficiency artificial light capturing system, and further prepares a temperature-controlled white light emitting material based on the temperature-variable artificial light capturing system.

A pixelated color display where the emission corresponds to a color space comprised of three regions: an outer boundary of the entire color space which is defined by the most saturated colors; an inner region formed by less saturated colors which is defined by an inner region boundary; and between the inner region boundary and the outer boundary, an intermediate region where at least one color is approximated by dithering between a most saturated color and a less saturated color. The dithering can be color spatial, temporal, or physical spatial dithering or combinations thereof. The display is an OLED, preferably a multimodal (white light-emitting) microcavity with a color filter array and can have 3 or more stacks of light-emitting units. The color dithering in the intermediate region allows for generation of colors that cannot be emitted directly by the display.