40 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 invention relates to the technical field of fluorescent powder materials, in particular to a lead-free double-perovskite fluorescent powder material and a preparation method and application thereof, the chemical formula of the lead-free double-perovskite fluorescent powder material is Cs2ZrCl6: 1% of Te < 4 + > and 3% of Mo < 4 + >, and 1% of Te < 4 + > and 3% of Mo < 4 + > are doping proportions; the lead-free double-perovskite fluorescent powder material prepared by the invention can be applied to preparation of white light-near infrared LED devices and composite X-ray scintillator films; the lead-free double perovskite fluorescent powder material prepared by the invention can simultaneously realize high-efficiency white light emission, near-infrared emission and X-ray excited radiation luminescence, so that the spatial consistency and acquisition synchronism of multispectral images are ensured from a hardware source, and the problems of image pixel dislocation, resolution mismatch, high resolution ratio and the like caused by the use of various luminescent materials at present are solved. And the later image fusion processing flow is complex and time-consuming.

The invention discloses a preposed light performance enhanced composite fluorescent ceramic for laser illumination and a preparation method thereof. The composite fluorescent ceramic comprises YAG: Ce fluorescent ceramic and ZrO2-Al2O3 ceramic, wherein a zigzag microstructure is constructed on the surface of the YAG: Ce fluorescent ceramic, and the ZrO2-Al2O3 ceramic and the YAG: Ce fluorescent ceramic are sintered into a whole. According to the zigzag microstructure YAG: Ce ceramic, the contact interface area with blue light can be increased, so that the probability of interaction between the blue light and the ceramic is improved, and the fluorescence conversion efficiency is improved; meanwhile, the sawtooth-shaped microstructure can reduce the total internal reflection effect of fluorescent light, and can regulate and control the propagation direction of emergent light, so that blue light and yellow light can be mixed more uniformly. The composite fluorescent ceramic prepared by the invention realizes high-brightness white light emission under the excitation of a blue light LD chip with the wavelength of 450-460 nm, and can bear the excitation power density of 60-75 W / mm < 2 > and the luminous efficiency of 210-260 lm / W. Compared with the traditional planar fluorescent ceramic without a microstructure, the luminous efficiency is improved by 40-60%, the divergence angle of emergent light is reduced from more than 100 degrees of a planar structure to 60-80 degrees, and the thermal conductivity at 20-30 DEG C is 20-27Wm <-1 > k <-1 >.

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.

The application provides a white fluorescent powder and a preparation method and application thereof, and belongs to the technical field of fluorescent powder, wherein the chemical formula of the fluorescent powder is Sr 1‑x Ca x Gd 1‑y‑z AlO4:yDy 3+ / zTm 3+ , wherein x, y and z are molar numbers, x is 0.015-0.025, y is 0.01-0.03, and z is 0.005-0.02. The application adopts Ca 2+ and Tm 3+ to dope SrGdAlO4:Dy 3+ fluorescent powder, so as to improve the luminescent performance of SrGdAlO4:Dy 3+ fluorescent powder, and achieve the purpose of high-efficiency white light emission; under the same excitation wavelength, SrCaGdAlO4:Dy 3+ / Tm 3+ fluorescent powder can simultaneously show the characteristic emission peaks of Dy 3+ and Tm 3+ . After Tm 3+ doping, the blue light emission intensity can be improved, and by changing the relative doping concentration ratio of Dy 3+ and Tm 3+ , the SrCaGdAlO4:Dy 3+ / Tm 3+ fluorescent powder can be modulated from warm white light to cold white light.

The invention discloses a visible-near infrared luminous rare earth doped lead-free double perovskite material which is synthesized by introducing processes of heating and stirring, ultrasonic mixing, gradient cooling and the like on the basis of a traditional hydrothermal method to synthesize a Sb < 3 + > / Er < 3 + > co-doped Cs2Na0. 95Ag0. 05YbCl6 double perovskite material. By effectively reducing the defect density in a crystal structure, the obtained material has the multi-wavelength luminescence characteristic from visible light to near-infrared light, single-component white light emission and near-infrared luminescence can be realized, and meanwhile, accurate temperature sensing can be carried out in a fluorescence intensity ratio (FIR) mode by utilizing the temperature dependence difference of rare earth ions Sb < 3 + > and Er < 3 + >. Therefore, the material can be applied to the aspects of high-precision optical temperature sensing detection, single-component white light LED illumination, near-infrared imaging and the like, and has wide application prospects and important social and economic values.

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 .

Disclosed is optical observation equipment for identifying the forming process of a malignant tumor, which is provided with a receiving space and a transparent front end. The optical observation equipment comprises: a light-guide fiber, a laser emitter, a focusing device, a white light emitter, an image sensor, a high gain amplifier and an encoding and emitting device, wherein the light-guide fiber extends to the transparent front end from the receiving space; the laser emitter emits laser with a wavelength of 340 nm±20 nm and an energy of 0.3˜0.5 mj / m2 in a pulsing mode; the focusing device is coupled to the output end of the laser emitter and used for focusing the laser to the input end of the light-guide fiber; the white light emitter is used for emitting white light, and the white light is guided into the input end of the light-guide fiber, wherein the laser emitter and the white light emitter are alternately turned on; the image sensor is used for acquiring an image of an area irradiated by light emitted from the output end of the light-guide fiber and converting a light signal into an electric signal; the high gain amplifier is coupled to the image sensor and is used for amplifying the electric signal generated by the image sensor; and the encoding and emitting device is coupled to the high gain amplifier and is used for encoding the signal output by the high gain amplifier and emitting the encoded signal.

The invention discloses an efficient single-phase full-spectrum luminescent metal halide luminescent material and a preparation method thereof. The chemical composition of the luminescent material is Cs2ZrCl6: Bi < 3 + > and Te < 4 + >. The method comprises the following steps: (1) weighing a proper amount of CsCl, ZrO2, BiCl3 and TeCl4 by using an electronic balance according to the stoichiometric ratio of materials, and putting the CsCl, ZrO2, BiCl3 and TeCl4 into a lining of a polytetrafluoroethylene reaction kettle; 2) adding a certain amount of concentrated HCl into the lining of the reaction kettle, and stirring for a certain time to dissolve all the raw materials; 3) taking out the stirrer, sealing the reaction kettle, placing the reaction kettle in an air dry oven, and reacting for a certain time at a certain temperature; and 4) washing the reaction product, and carrying out vacuum drying to obtain the Cs2ZrCl6: Bi < 3 + >, Te < 4 + > material. The material emits bright white light under the excitation of ultraviolet light. The synthesis method disclosed by the invention has the characteristics of low raw material cost, simple experimental operation, batch synthesis and the like; meanwhile, the obtained product is good in crystallinity, high in stability, environment-friendly and excellent in luminescent property; the method can be used in the technical fields of illumination display, anti-counterfeiting, photoelectric detection and the like.

The invention relates to a white organic light-emitting device of a diboron azaanthracene derivative and a preparation method of the white organic light-emitting device. The diboron azaanthracene derivative, namely BNAnti-OMe, is a diboron nitrogen doped anthracene micromolecular material, and the material has the characteristics of relatively wide band gap, relatively strong blue fluorescence emission, relatively high triplet state energy level and the like. Double light-emitting layers of the organic light-emitting device comprise an intrinsic blue fluorescent light-emitting layer of BNAL-OMe, a red phosphorescent light-emitting layer of BNAL-OMe gradient doped Ir (MDQ) 2acac, a transparent conductive ITO glass substrate, a hole injection layer HATCN and a hole transport layer TAPC, wherein the transparent conductive ITO glass substrate, the hole injection layer HATCN and the hole transport layer TAPC are located on the left side of the intrinsic blue fluorescent light-emitting layer of BNAL-OMe in sequence. And an n-type doped hole barrier layer BCP: TmPyPb, an electron transport layer TmPyPb, an electron buffer layer LiF and a metal back electrode Al are sequentially arranged on the right side of the BNAL-OMe: Ir (MDQ) 2acac light-emitting layer. According to the double-boron azaanthracene derivative light-emitting layer and the double-boron azaanthracene derivative gradient doped red phosphorescent dye light-emitting layer, white light emission is achieved through light color complementation, and the color stability and the brightness of a white light device can be effectively improved through the fluorescent / phosphorescent double-light-emitting-layer design of the double-boron azaanthracene derivative light-emitting layer and the double-boron azaanthracene derivative gradient doped red phosphorescent dye light-emitting layer.

The invention relates to the technical field of fluorescent material preparation, in particular to fluorescent powder based on a negative thermal expansion material and a preparation method and application thereof. The fluorescent powder comprises an Sc2Mo3O12 matrix and Tm < 3 + > / Dy < 3 + > doped ions, and is prepared by a high-temperature solid-phase method. The fluorescent powder can obtain white light emission of color-adjustable coordinates by adjusting the concentration of Tm < 3 + > / Dy < 3 + > under excitation of the wavelength of 354 nm. When the concentration of Dy < 3 + > is 4%, the chromaticity coordinate of the fluorescent powder is (0.3311, 0.2877) close to ideal white light, the fluorescent powder shows good light-emitting stability in a wide temperature range of 298K to 573K, the light-emitting intensity at the high temperature of 573K can still keep 60% of the initial intensity at the room temperature, and the fluorescent powder can be widely applied to high-power and high-temperature environment white light LED illumination in the fields of precise instruments, aerospace and the like.

The present invention provides: a wavelength conversion sintered body which is capable of improving the luminous efficiency of white light and is capable of reducing the chromaticity difference with respect to radiation angle; and a white light emitting element. A wavelength conversion sintered body (10) comprises a phosphor material (11) represented by general formula Y3-x-yBaxAl5-xSixO12:Cey (wherein x + y < 3, 0 < x < 3, and 0 < y < 3), and fine particles (12) dispersed in the phosphor material (11). The fine particles (12) are composite oxides of Ba, Si, and Al.

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.

To provide a wavelength conversion member and white light-emitting device, which feature a short emission lifetime and good wavelength conversion efficiency at high temperature.SOLUTION: A wavelength conversion member (3) disclosed herein comprises a phosphor material that has a cubic crystal system with a garnet structure with the Ia3d space group and is represented by a general formula: (BaxLuzY3-x-y-z)(Al5-xSix)O12:Cey, where x+y+z<3, x<5, x>0, y>0, and z>0.SELECTED DRAWING: Figure 1

The invention relates to the technical field of organic light-emitting devices, in particular to a hybrid white-light organic light-emitting diode based on solution processing and a preparation method thereof.The device sequentially comprises an ITO glass substrate, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer and a cathode, the luminescent layer is composed of high triplet state energy level double host materials mCBP and DPEPO, a blue light TADF object, a green light phosphorescence or TADF object, and a red light fluorescence or phosphorescence object, chlorobenzene is used as a solvent for solution processing, and the luminescent layer is prepared through a spin coating technology. The method comprises the steps of ITO substrate cleaning, spin coating of functional layers, high-temperature annealing treatment and vacuum evaporation of an electron transport layer, an electron injection layer and a cathode, high external quantum efficiency, low efficiency roll-off, high color rendering index and stable white light emission are achieved by optimizing material selection and the technological process, and the method has remarkable technical advantages and wide application prospects.

To provide a wavelength conversion sintered body and a white light-emitting element capable of improving luminous efficiency of white light and reducing chromaticity difference with respect to an emission angle.SOLUTION: A wavelength conversion sintered body (10) includes: a phosphor material (11) represented by a general formula Y3-x-yBaxAl5-xSixO12:Cey (where x+y<3, x<5, x>0, y>0); and particles (12) dispersed in the phosphor material (11). The fine particles (12) are a composite oxide of Ba, Si, and Al.SELECTED DRAWING: Figure 1

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 invention discloses a high-brightness lead-free double-perovskite white light diode device and a preparation method thereof, two lead-free double-perovskite crystals (PMA) 4NaInCl8: Sb and Cs2NaInCl6: Sb are adopted to prepare a lead-free double-perovskite polycrystalline film in the diode device, and co-crystallization and white light emission regulation and control of double-phase perovskite are realized by accurately regulating and controlling the component proportion and the annealing temperature. The prepared composite material shows an excellent white light emission characteristic and is successfully applied to an electroluminescent device, the maximum brightness of the device can reach 2040cd m <-2 >, and the high-brightness white light output performance of the device is equivalent to the optimal performance of an existing lead-free double-perovskite white light diode. According to the technology, the toxicity problem and the instability defect of traditional lead-based perovskite are effectively solved through the dual-phase synergistic energy funnel effect (the interface potential gradient delta V is approximately equal to 250 mV), and a new thought is provided for development of environment-friendly photoelectric display devices.

The invention relates to an organic diode for vehicle-mounted illumination, and belongs to the field of manufacturing of vehicle electronic devices. The preparation method comprises the following steps: mixing an acetone solution containing Au (tht) Cl with an acetone solution containing HC2R (R = C6H110), stirring the mixture with Et3N in a dark place to obtain yellow powder, washing, drying and dispersing the yellow powder, adding an acetone solution dissolved with [Au2 (PPh2C6H4PPh2) 2] < 2 + >, evaporating and re-dissolving, carrying out gas phase diffusion crystallization by using diethyl ether, standing, collecting bright yellow blocky crystals [Au8 (C2C6H11O) 6 (PPh2C6H4PPh2) 2] (PF6) 2 attached to the inner wall of a container, and drying the bright yellow blocky crystals. A main body material composed of main body materials mCP and OXD-7 is added, and the material is prepared through spin coating and evaporation processes. According to the method for preparing the hybrid white light emission metal complex organic diode, hybrid emission of the main body material and the metal nanoclusters generates bright white light emission, and the hybrid white light emission metal complex organic diode is low in driving voltage and suitable for vehicle-mounted illumination.

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 application discloses a single-molecule white light emitting fluorescent material with ESIPT property as well as a preparation method and application thereof. The single-molecule white light emitting fluorescent material has the structure as shown in formula I. The preparation method of the single-molecule white light emitting fluorescent material is simple, raw materials are cheap and easy to obtain, the synthesis process is simple, the yield is high, and the method is suitable for large-scale production and popularization and application. The single-molecule white light emitting fluorescent material has the property of being able to exhibit pure white light emission in an aggregated state, and also has the advantages of high quantum yield and solid-state light emission, and has a wide application prospect in the field of organic photoelectric materials. The single-molecule white light emitting fluorescent material has a further modifiable modification site in the structure, and also has great application potential in the imaging of biological probes.

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.