102results about How to "Excellent spectral performance" patented technology

A tunable filter includes a polarizing beam splitter and a half-wave plate that produce two equally polarized beams from an arbitrarily polarized input light. The polarized beams are directed toward a tunable component that consists of an optical substrate coated with a filter and a reflective element on its back and front surface, respectively. The pass and stop beams emerging from the tunable component are retro-reflected by roof structures and passed again through the filter. As a result of this combination of components, the filter's performance is not dependent on polarization and the filter's output channels are not shifted or deviated by tuning.

The invention discloses a method for preparing CdSe and ZnSe quantum dots nanometer particles. Aluminum powder and strong base solution are adopted for the reduction of selenium powder and sulphuric acid is added to generate hydrogen selenide, the hydrogen selenide is brought out by the flow of high purity nitrogen and dissolved in oil amine to obtain oil amine-hydrogen selenide composite; the oil amine-hydrogen selenide composite which is taken as a new selenium precursor, together with cadmium stearate and orzinc stearate, is used for preparing the CdSe and ZnSe quantum dots nanometer particles at high temperature; the prepared quantum dots nanometer particles have controllable spectrum and excellent performance and can be applied to the fields such as biological fluorescence label, optoelectronic materials, etc. Furthermore, the method for preparing quantum dots nanometer particles can avoid the adoption of trioctylphosphineoxide (TOP) which has strong toxicity and high price, and is low in cost and suitable for industrial production.

The invention discloses perylene diimide-based photoelectric functional materials and a preparation method thereof. A series of polymers with different contents are prepared through Suzuki polymerization, Yamamoto polymerization, Stille polymerization or Sonogashira polymerization. The materials have good thermal, photic and chemical stability and good application prospects in the fields such as organic solar cells and the like. The structural formula of the perylene diimide-based polymers is shown in the specification, wherein a is a number between 1 and 30; b is a number between 0 and 30; R is C1-C10 alkyl or alkoxy; A1 is any one of the following structures shown in the specification, wherein n is a number between 1 and 10; and R is C1-C10 alkyl.

The invention discloses an optical / crystal comprehensive film thickness monitoring method for accurately controlling a film coating device to prepare a high-performance optical thin film. The method comprises the following steps: inputting film coating parameters to a computer before film coating; providing a film coating monitoring table of a coated film system according to the input film coating parameters by the computer, wherein the film coating parameters include monitoring wavelength of the corresponding layer film, the theory extreme value or crystal control coefficient; and coating the film. The optical / crystal comprehensive film thickness monitoring method provided by the invention integrates advantages of a photoelectricity extreme method and a quartz crystal oscillation method, and can overcome the defects that a tool factor of a quartz crystal oscillator is easily influenced by film layer deposition parameters when the photoelectricity extreme method and the quartz crystal oscillation method are used individually, and the error is great when a non-structured membrane system is monitored by the photoelectricity extreme method. The method can be used for monitoring a structured membrane system and the non-structured membrane system, lowers the film thickness monitoring error effectively, improves the spectrum performance of the film, and has favorable repeatability.

The invention relates to a film thickness monitoring method capable of increasing spectral characteristics of film, for a computer-controlled coating device. The method comprises the following steps: (1) inputting coating parameters to a computer before coating; (2) selecting the monitoring wavelengths and monitoring glass number satisfying the limited conditions through the calculation of the computer to obtain a coating monitoring table of the coating system, wherein lambda Min<lambda<lambda Max and the coating monitoring table contains sequential films of the coating system, the corresponding monitoring wavelengths and monitoring glass serial numbers; and (3) coating and the like. By adopting the method, the monitoring wavelengths and required mininum monitoring glass number can be automatically selected; by adopting the proportional film thickness monitoring method, the film thickness monitoring error can be reduced, the film thickness monitoring precision can be increased and the normalized coating system and the non-normalized coating system can be monitored. Under the condition that the control precision of the film thickness monitoring system is not changed, the spectral characteristics of the film can be effectively increased.

An optical filter may include a first reflector and a second reflector. The first reflector may include a plurality of first gratings having a first sub-wavelength dimension and being arranged to recur at a first interval in a first direction. The second reflector may be spaced apart from the first reflector and include a plurality of second gratings having a second sub-wavelength dimension and arranged to recur at a second interval in a direction parallel to the first direction. The first reflector and the second reflector may include different materials or different geometric structures from each other. Accordingly, it is easy to adjust the transmission wavelength characteristics of the optical filter.

A system and method are provided for calibrating an interleaved digital-to-analog converter (DAC). Sets of sub-DACs are enabled, and by creating a high frequency fundamental signal, spurs can be driven down sufficiently low in frequency to be sampled and digitally converted. By minimizing the power of these digital signals, the duty cycles of the different clock phases are calibrated. Then, sets of sub-DACs are enabled and high pass filtered, so that the spurs can be downconverted using corresponding phases of the clock, to a frequency low enough to sampled and digitally converted. The power of the digital signals is minimized as a first step in phase calibration. As a final step, all the sub-DACs are enabled, the high pass filter removed, and a high frequency fundamental signal is downconverted using at least two clock phases, so that the phase difference can be measured and corrected.

The invention relates to a controllable preparation method for Au@SiO2 core shell nano-material with an ultra-thin shell structure. The controllable preparation method for the Au@SiO2 core shell nano-material with the ultra-thin shell structure mainly solves the problem that SiO2 is difficult to coat gold nano-particles modified by PDDA. The shell thickness of the coated Au@SiO2 core shell nano-material can be controlled through the MPTS amount, reaction time and the like parameters. The prepared Au@SiO2 core shell nano-particles are regular in shape and uniform in shell thickness, and the thickness can be controlled at 5 to 20 nanometers. The Au@SiO2 core shell nano-material with the ultra-thin shell structure has potential application value for the catalyzing, bio-sensing and the like, and more choices are provided for the template material for preparing multi-structure and multi-functional special nano-material.

The invention discloses a laser device plant light. The laser device plant light comprises a circuit board. A semiconductor laser device pipe core is packaged on the circuit board, and a light uniformizing piece which is matched with the circuit board in shape covers the semiconductor laser device pipe core. The semiconductor laser device pipe core is an edge emitting type laser device, and a semiconductor laser device is electrically connected with the circuit board through an L-shaped heat sink. The L-shaped heat sink comprises an L-shaped negative electrode layer, an L-shaped insulating layer and an L-shaped positive electrode layer. An L-shaped groove is formed in the inner surface of the L-shaped negative electrode layer. The L-shaped positive electrode layer is embedded into the L-shaped groove. The L-shaped insulating layer is arranged between the L-shaped negative electrode layer and the L-shaped positive electrode layer. The laser device plant light can provide light rays with the wave length required by plants, and the laser device plant light has the obvious advantages of being good in spectrum performance, high in power, short in response time, small in size, high in reliability and durability, low in cost, long in service life, environmentally friendly, capable of saving energy and the like.

The invention provides an ytterbium, lutecium, gadolinium and gallium doped garnet laser crystal, a preparation method and applications thereof. The formula of the crystal is (Yb<y>Lu<x>Gd<1-x-y>)3Ga5O12, wherein the x is larger than 0 and smaller than 1, the y is not smaller than 0.01 and not larger than 0.5, and the sum of x and y is not larger than 1. Yb3+ is taken as the activated ion and can achieve continuous and impulse laser output near 1 [mu]m under the pumping of laser diode (LD) or other lasers. The crystal Yb(Lu<x>Gd<1-x>)3Ga5O12 is prepared by adopting the Czochralski method. Yb:LGGG crystal is obtained by mixing part Lu3+ into the dodecahedron cases of the Yb:GGG crystal. The crystal has the advantages of stable growth interface and high crystalline quality, and can be applied to the production of laser crystal, which can generate continuous laser output, Q-switch laser and mode-locked laser.

The present invention discloses Yb<3+> fluorophosphate glass, which contains, in mole percent, MgF2: 22, Baf2: 32 to 52, PbF2: 5 to 25, Al (PO3)3: 20, and YbF3: 1. The preparation method is stated as follows: according to the formulation, the powder of every component is melted to be the glass melting liquid after the uniform mixing and is poured on a mould, and is placed into a muffle with the temperature increased to the transformation temperature of the glass for the temperature conservation for two hours, and then is annealed to 80 to 120 DEG C with the temperature decreasing speed of 5 DEG C per hour, and then is cooled to the room temperature. The glass component of the present invention is simple, the preparation craftwork is simple, and the cost is low. The glass has high devitrification stable performance, and the spectrum performance is good. The glass is very applicable to producing the optical-fiber pre-fabrication rod and to performing the optical-fiber drawing, and is also applicable to be used as the basic material for other rare mixed laser glass.

The invention discloses a pyrisoxazole-cnidium lactone suspension emulsion and a preparation method thereof. The suspension emulsion contains the following components in percentage by weight: 1%-40% of pyrisoxazole, 0.05%-5% of cnidium lactone, 1%-50% of a solvent, 1%-40% of an emulsifying agent, 1%-10% of a dispersant, 2%-4% of a botanical fungicide, 0.1%-10% of a thickener, 1%-5% of an anti-freezing agent, 0.1%-1.0% of an anti-foaming agent, 0.1%-1% of a preservative and the balance being water. The compound preparation can effectively prevent and control diseases and pests of crops (for example, the preparation can simultaneously prevent and control a disease, i.e., blight, and pests, i.e., cotton bollworm, of cotton), and is durable in efficacy. The compound preparation can also effectively prevent and control various diseases on crops, for example the preparation can simultaneously prevent and control white rot, gray mold and powdery mildew on grapes as well as gray mold, leaf mold and powdery mildew on tomatoes; the compound preparation has obvious effects of protecting seedlings and increasing production, is simple in production process, and has labor-saving, time-saving and energy-saving effects, obvious economic, ecological and environmental benefits, and wide development prospect.

The invention provides a film system structure of an ultra-wide-angle laser and long-wave infrared dual-band high-strength antireflection film. The film system structure is composed of a zinc sulfidesubstrate and an antireflection film system. The antireflection film system is formed by superposing film layers prepared from four thin film materials, wherein the total number of the film layers is19, and, from the zinc sulfide substrate, the first layer is hafnium oxide, odd layers from the second layer to the eighteenth layer are ytterbium fluoride film layers, even layers are zinc sulfide film layers, and the nineteenth layer is a silicon nitride film layer. According to the invention, high transmission of 1.064 [mu]m laser and 7.5-10.0 [mu]m long-wave infrared rays in an ultra-wide angle range of 0-76 degrees can be realized; the film layers are firm and high strength is achieved; the structure can pass severe environment tests such as wind tunnels, sand dust, raining, salt mist, damp heat, temperature impact and the like in national military standard GJB 150-2009; the structure can meet the application requirements of multi-spectral zinc sulfide optical windows of radar stealthhigh-speed weapon platforms and can be applied to stealth optical windows of multi-band common-optical-path optical systems of stealth airborne and stealth ship-based high-speed weapon platforms.

The invention discloses a film system designing method for an optical thin film on an optical lens with high caliber-curvature-radius ratio. For optimizing the performance of the optical system, the optical thin film with excellent spectral property consistency is required to be prepared on the optical lens with the high caliber-curvature-radius ratio, therefore, film system designing for the optical thin film is required to be optimized globally. According to the film system designing method provided by the invention, firstly, thickness distribution of the optical thin film on the optical lens with the high caliber-curvature-radius ratio is determined through experiments or theoretical analysis; and secondly, the film system designing for the optical thin film is optimized globally by adopting a numerical computation method according to the requirements of spectral properties and light incident angles in all positions of the optical lens with the high caliber-curvature-radius ratio. Compared with a traditional designing method for the optical thin film, the film system designing method provided by the invention gives consideration to the thin film thickness and light incident angles on the optical lens with the high caliber-curvature-radius ratio, and is particularly suitable for thin film designing for the optical thin films on various sizes of optical lenses with high caliber-curvature-radius ratios.

The invention provides a hydrophobic heat insulation and cooling film and a preparation method thereof. The hydrophobic heat insulation and cooling film is a polymer porous film, the porosity is 30% -90%, the interior of the hydrophobic heat insulation and cooling film is of a spongy structure, the pore diameters of pores are distributed in a bimodal mode, and the width distribution of the poresis 0.2 micrometer - 0.6 micrometer and 1 micrometers - 5 micrometers respectively. The preparation method of the hydrophobic heat insulation and cooling film comprises the following steps of dissolving a polymer into an organic good solvent, adding a non-solvent to prepare a precursor solution, and spraying the precursor solution onto a substrate to obtain the hydrophobic heat insulation and cooling film. The hydrophobic heat insulation and cooling film is a flexible film material with good hydrophobicity, good heat insulation effect and good cooling effect, shows very excellent flexible performance, can be bent and curled at will, can be suitable for the surfaces of base bodies with different shapes, can achieve effective cooling and refrigeration inside the base bodies, and is good in application prospect and high in practicability; the preparation method of the hydrophobic heat insulation and cooling film has the advantages of simplicity, feasibility, low production cost, high filmforming efficiency and the like, is suitable for large-scale preparation and is beneficial to industrial application.

The invention discloses a method for selectively determining Cu < 2 + > by using one-step microwave hydrothermal synthesized fluorescent carbon dots. The method is characterized by comprising the following steps: S1, preparing carbon dots; S2, separating and purifying the carbon dots; S3, concentrating a carbon dot solution; S4, adjusting the pH value of the carbon dot concentrated solution to 14,taking the carbon dot solution, scanning the emission spectrum of the carbon dot solution when an EX is in a range of 360-580nm, and detecting the fluorescence intensity; S5, concentrating a solutioncontaining the metal cations until the solution is close to a saturated state, pouring the concentrated solution containing metal cations into the carbon dot solution, scanning the emission spectrumof the carbon dot solution, detecting fluorescence intensity, determining the fluorescence of the carbon dot solution is obviously quenched, and considering the solution containing metal cations contains Cu < 2 + >. According to the invention, the new method for detecting Cu < 2 + > based on the fluorescence quenching mechanism is successfully established by using the carbon dot as a fluorescenceprobe, and the method has characteristics of simple operation, environmental protection, low cost and short required time, and provides the simple and rapid method for rapid and real-time Cu < 2 + > detection.

The invention discloses a preparation method of titanium dioxide based graphene / La3+ carbon fibers. The preparation method includes the following steps that 1, graphene and polyacrylonitrile are dissolved in a DMF solution to prepare a graphene / polyacrylonitrile / DMF mixed solution, wherein the graphene concentration is 0.0007-0.0056 g / mL, and the polyacrylonitrile concentration is 0.08 g / mL; 2, lanthanum nitrate is added to a glacial acetic acid and tetra-n-butyl titanate mixed solution to form an La3+ doped TiO (OAc)2 solution; 3, the solution formed in the step 2 is slowly added to the graphene / polyacrylonitrile / DMF mixed solution in the step 1 under the action of mixing, and vacuum mixing is performed to obtain a spinning solution after adding is performed dropwise; 4, the spinning solution in the step 3 performs electrostatic spinning to obtain a product. The preparation method has the advantages of high strength, simple production equipment, easy and convenient operation and a good antibacterial effect.

The invention provides gradient doped laser transparent ceramic and a preparation method thereof. Characteristics of an injection molding method are fully utilized, vacuum sintering is combined, the laser transparent ceramic with gradient doped rare earth elements is prepared, and 0.1at%-6at% gradient rare earth ion concentration of the laser transparent ceramic in the gradient direction is realized. Comprised with same-specification laser transparent ceramic with high concentration doped rare earth elements, the laser transparent ceramic with gradient doped rare earth elements has the advantages of good transparency; compared with same-specification laser transparent ceramic with low concentration doped rare earth elements, the laser transparent ceramic with the gradient doped rare earth elements is good in spectral property and has uniform laser output; with the preparation method, the gradient doped laser transparent ceramics of various complicated shapes can be prepared, which cannot be realized with other methods; meanwhile, simpleness in preparation technology is achieved, concentration gradient is easily controlled, slurry substrates are wide in application range, and low cost is achieved.

The invention discloses rare earth phosphate scintillating glass and a preparation method of the same, and relates to the field of inorganic rare earth luminous material. Trivalence cerium ions (Ce 3+) are added into a M2O-RE2O3-P2O5 phosphate glass system, and a transparent rare earth scintillating glass is produced. In the phosphate system, M is an alkali metal element and RE is a rare earth element. The transparent rare earth scintillating glass is produced through processes of mixing raw materials, pre-sintering, melting, moulding and annealing. The prepared transparent rare earth phosphate scintillating glass has strong light output in the range of 310 to 430 nanometers under the radiation of X-rays. The fluorescence attenuation lifetime is around 30 nanoseconds, and has a rapid fluorescence attenuation characteristic. The preparation method of rare earth phosphate glittering glass has the advantages of simple preparation technology, low production cost, strong light output, rapid fluorescence attenuation, and wide application prospect in high-energy ray detection field.

The invention relates to a preparation method of zinc and silver co-doped cadmium sulfide quantum dots. It is characterized in that: with Zn(CH 3 COO) 2 2H 2 O as zinc source, AgNO 3 The solution is silver source, with CdCl 2 2.5H 2 O is the source of cadmium, stir well to obtain a mixed solution, under the protection of nitrogen, use glutathione (GSH) as a stabilizer, in an alkaline aqueous solution, use Na 2 S·9H 2 O is a sulfur source, heated in a water bath, and reacted to obtain zinc and silver co-doped cadmium sulfide quantum dots. The preparation method has simple process, easy to obtain raw materials, low energy consumption, uniform particle size of quantum dots, excellent water solubility, excellent electrochemical performance and fluorescence performance, adjustable fluorescence emission peak position, and is suitable for use in fluorescent probes, photoelectric conversion, It has great application prospects in the detection of heavy metal ions.

The invention discloses a preparation method of a vacuum ultraviolet aluminum reflection mirror and belongs to the technical field of optical thin film. The method mainly aims at key factors, influencing optical performance of the aluminum reflection mirror, in the vacuum ultraviolet aluminum reflection mirror, the key factors include aluminum film oxidation and structure defects and absorption loss of a medium protection layer, a physical vapor deposition technology is adopted for coating aluminum film, then a first protection layer is quickly deposited, the first and second layers of deposited thin film are fluoridated, and finally a second protection layer is deposited. Compared with a traditional preparation method of an aluminum reflection mirror, the method has the advantages that the influence of aluminum film oxidation and absorption loss of the medium layer to the optical performance of the vacuum ultraviolet aluminum reflection mirror can be well reduced, the structure compactness of the protection layer is improved, and the environment stability of the vacuum ultraviolet aluminum reflection mirror is improved. The method has the advantages of being high in targeting performance and quality, simple and easy to implement.

The invention discloses an indole-triphenylamine-arylmethylidenemalononitrile solar energy co-sensitization dye, a synthetic method and application thereof. The synthetic method comprises the following steps: adopting triphenylamine as the raw material, carrying out reaction on triphenylamine and POCl3 in a DMF solvent to compound and obtain an intermediate 4-(diphenyl amido) benzaldehyde; carrying out reaction on the 4-(diphenyl amido) benzaldehyde to obtain 4-bis (4-iodophenyl) aminobenzaldehyde; respectively carrying out reaction on the 4-bis (4-iodophenyl) aminobenzaldehyde and indole, 2-methylindole and 3-methylindole to obtain an indole-triphenylamine aldehyde derivative; respectively carrying out reaction on the indole-triphenylamine aldehyde derivative and cyanoacetic acid, malononitrile or 2-(3, 5, 5-trimethyl cyclohexene-2-octenylidene) malononitrile to obtain an indole-arylmethylidenemalononitrile-triphenylamine derivative. According to the synthetic method, the relevant optical property, photo-electro transition rate and co-sensitization efficiency of the product are primarily studied, and the foundation for developing the dye into a novel solar energy co-sensitization dye with excellent properties is laid.

The invention discloses a 266-nanometer high-power laser antireflection film and a preparation method thereof, the 266 nanometer high-power laser antireflection film has a film layer structure of A / cL / bH / aL / SUB / aL / bH / cL / A, wherein SUB represents a glass substrate, A represents air, H represents a high-refractive-index film layer, L represents a low-refractive-index film layer, a, b and c are coefficients of the quarter reference wavelength optical thickness of each film layer respectively, a is 1.6 + / -0.2, b is 0.53 + / -0.2, and c is 1.13 + / -0.2. The 266-nanometer high-power laser antireflection film has a high laser damage resistance threshold in the ultraviolet band, the transmittance of the antireflection film at the 266nm band can reach 99.9% or above, and the 266-nanometer high-power laser antireflection film not only has good spectral performance, but also has good mechanical stability and stability, and can meet some high-end applications in the current near-ultraviolet field.

The invention relates to a fluorescence detection method of a pyridyl quaternary ammonium salt cationic surfactant, and its application, and also relates to a fluorescence detection agent of the pyridyl quaternary ammonium salt cationic surfactant, and its application. The fluorescence detection agent of the pyridyl quaternary ammonium salt cationic surfactant has the advantages of wide linear detection range, low detection limit, low cost and rapidness. The structural formula of the pyridyl quaternary ammonium salt cationic surfactant is shown in the specification; and in the structural formula, R is CnH2n+1, or CnH2n+1NCOCH2, n is 8-18, X<-> is Cl<->, Br<-> or I<->. The method and the agent can be used for detecting the pyridyl quaternary ammonium salt cationic surfactant in practical environment water samples, such as surface water, lake water and municipal sewage.

The invention belongs to the field of medical materials and particularly relates to a preparation method of liquid antibacterial protective films. The preparation method includes: after subjecting cocoon shells to degreasing and adhesive materials removing through a sodium bicarbonate solution, adding filling fluid to the cocoon shells for standing overnight, and obtaining sieving particles via extruding, drying, smashing and sieving; performing mixed enzymolysis with distilled water and the like under the alkaline condition to obtain a digested mixture; adjusting the digested mixture to neutral with hydrochloric acid prior to performing centrifugal separation to obtain a supernate; performing mixed cooking with carrageenan, distilled water and the like prior to mixed decolorizing with activated carbon after filtration to obtain a destaining solution after filtration; subjecting the destaining solution to mixed concentration with the supernate to obtain the liquid antibacterial protective films. The method is simple in process, the obtained protective films are good in biocompatibility, good broad-spectrum antibacterial property in use is achieved, efficiency time can be effectively prolonged, and good use and therapeutic effects are achieved.

The invention discloses a three-band laser antireflection film and a preparation method thereof. The three-band laser antireflection film comprises a base layer; a composite layer and a MgF2 layer aresequentially deposited on the base layer; the composite layer comprises alternatively deposited YF3 layers and ZnSe layers; the base layer is connected with the YF3 layer; and the MgF2 layer is connected with the ZnSe layer. The three-band laser antireflection film provided by the invention has the single-face reflectivity of not more than 1% at the 650nm band, the single-face reflectivity of notmore than 0.25% at the 1570nm band, the single-face reflectivity of less than 0.25% at the 10.6micron band, meets the operating requirements of the multi-wavelength laser machining equipment opticalsystem, and is good in optical performance, strong in film adhesion and rub resistance, good in water resistance and temperature resistance, good spectrum performance and relatively good mechanical performance and stability, good in preparation repeatability, simple and easy to operate, and easy to control.

The invention provides additive-containing blended gasoline. In a process, a certain amount of ethanol, an oleophilic non-ionic surfactant, a hydrophilic non-ionic surfactant, a stabilizing agent and a flow-modified clean dispersing agent are added into several materials easily purchased in the market. The additive-containing blended gasoline is characterized in that: the oleophilic non-ionic surfactant is Span S-80 (sorbitantristearate); the hydrophilic non-ionic surfactant mainly comprises Tween 80 (sorbide stearic acid ester polyoxyethylene ether); an appropriate amount of lubricating agent is added to reduce mechanical friction; and the stabilizing agent is triethanolamine, sodium oleate, quadrol and the like. The additive-containing blended gasoline has obvious energy saving effect.

The invention discloses an efficient colored heat-insulating and cooling coating as well as a preparation method and application thereof, the efficient colored heat-insulating and cooling coating takes a polymer porous film as a bottom layer, and an infrared transparent colored film is arranged on the polymer porous film. The preparation method comprises the following steps: preparing the polymer porous film and preparing the infrared transparent color film on the polymer porous film. The efficient colored heat-insulating and cooling coating has the advantages of being adjustable in appearance color, high in sunlight reflecting capacity, good in heat-insulating and cooling effect and the like, the coating is attached to the surface of a base body needing temperature adjustment and the skin surfaces of animals and human bodies in a covering, coating or pasting mode and the like, the color requirements of city appearance, pollution prevention and the like are met, and meanwhile the heat-insulating and cooling effects are good. The efficient cooling effect can be shown, refrigeration energy consumption is greatly reduced, the use value is high, and the application prospect is good. The preparation method has the advantages of being simple and easy to implement, low in production cost, high in film forming efficiency and the like, is suitable for preparing a large-area coating material and is beneficial to industrial application.