1080 results about "Photochromism" patented technology

Photoswitchable photoinitiators comprising a photochromic molecule including one or more substituents and including a polycyclic group attached to the photochromic molecule as a substituent or to a substituent on the photochromic molecule, the polycyclic group including at least two fused rings of atoms, wherein at least one of the fused rings of atoms includes a carbon atom with a substituent comprising a double bonded oxygen, and wherein the photochromic molecule and polycyclic group have no ring member in common. Photohardenable compositions, hardenable resin compositions, and methods for forming an object, which photohardenable compositions, hardenable resin compositions, and methods include a photoswitchable photoinitiator described herein, are also disclosed.

The invention relates to a semitransparent color-changeable solar cell and a preparation method thereof. The cell comprises the following modules which are stacked in sequence: a substrate; one or more photovoltaic modules, and one or more color changing modules. According to the technical scheme of the invention, the semitransparent solar cell can convert light energy into electric energy, and change of an absorption spectrum, namely photochromism, can be realized at the same time. In the embodiment of taking glass / ITO / PEDOT: PSS / PM6: Y6 / ZnO / BTE-CN / AgNWs: HPMC / ZnO as a device structure, 56.6% of average visible light transmittance can be maintained on the premise of realizing more than 5% of energy conversion efficiency, and the transmittance change exceeds 6% after complete color change. Meanwhile, compared with a standard device without a photochromic layer, the device with the structure can keep better anti-ultraviolet stability in the coloring-fading circulation process.

Systems, methods and apparatuses are described for dimming one or more portions of an extended reality (XR) display. Control circuitry may be configured to generate for display, at the display, an XR object. A dimmable optical element may comprise a plurality of up-converting nanoparticles and a photochromic material, and is configured to cause a change in color of at least a portion of the display. The dimmable optical element may be irradiated with light of a first energy level which causes the plurality of upconverting nanoparticles to emit light of a second energy level higher than the first energy level. The photochromic material may absorb the light of the second energy level to cause the change in color of the at least a portion of the display.

The invention discloses an excitation modulation frequency domain ultraviolet visible absorption spectrum testing system and method based on a lock-in amplifier and application. The test system comprises an excitation modulation system, a spectrum acquisition system, a signal acquisition and analysis system and a LabView upper computer system, the spectrum acquisition system comprises a portable fiber optic spectrometer, and the signal acquisition and analysis system comprises a data acquisition card and a lock-in amplifier. According to the invention, a LabView program is utilized to carry out control and data acquisition and analysis on the system. Compared with the traditional in-situ ultraviolet-visible absorption spectrum, the in-situ ultraviolet-visible absorption spectrum based on the lock-in amplifier has the advantages that excellent signal resolution can be realized with higher time resolution, and the in-situ ultraviolet-visible absorption spectrum based on the lock-in amplifier is particularly suitable for some systems with higher reaction rate and trace concentration change. The test system and the test method are not only suitable for common electrochromic and photochromic materials, but also suitable for dynamic characterization of more catalytic materials.

A dual-modal information storage and anti-counterfeiting material, and its preparation method are provided. The dual-modal information storage and anti-counterfeiting material uses cadmium sulfide quantum dots (CdS QDs) as information storage material, and uses the controllable photocorrosion of CdS QDs to achieve dual-modal optical information storage and anti-counterfeiting applications. Firstly, the type of ligands and modification degree of CdS QDs are precisely controlled during the aqueous phase synthesise process, so as to effectively control the photocorrosion phenomenon under UV light irradiation. Subsequently, the CdS QDs are loaded in the hydrogel network, and they are also loaded on the substrates such as cloth and paper by spray coating, dip coating or 3D printing, and the information is stored by digital light patterning. Different from the photochromic function of traditional anti-counterfeiting material, the CdS QDs shows dual-modal patterning characteristics in a wide wavelength range.

Some variations provide a photochromic heterostructure comprising: first semiconductor nanoparticles that have an average first-nanoparticle effective diameter from 1 nanometer to 20 nanometers, wherein the first semiconductor nanoparticles are not doped; and second semiconductor nanoparticles that have an average second-nanoparticle effective diameter from 1 nanometer to 60 nanometers, wherein the second semiconductor nanoparticles are doped with one or more transition metals, wherein the second semiconductor nanoparticles have a bandgap energy that is higher than the bandgap energy of the first semiconductor nanoparticles, and wherein the first semiconductor nanoparticles and the second semiconductor nanoparticles are in physical contact with each other. The disclosed photochromic heterostructure is especially useful when lower-energy light excites lower-energy-bandgap first nanoparticles to cause higher-energy-bandgap, doped second nanoparticles to photodarken. If the first nanoparticles were not present, the doped second nanoparticles would require higher-energy light to cause darkening. Examples demonstrate embodiments of the invention.

Photoswitchable photoinitiators comprising a photochromic molecule including one or more substituents at least one of which comprises a substituted or unsubstituted alpha-diketone moiety represented by general formula Ar1—C(═O)—C(═O)—Ar2, wherein Ar1 and Ar2 are the same or different and are independently a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group. Preferably the photochromic molecule comprises a benzospiropyran molecule, a naphthopyran molecule, or a spironaphthoxazine molecule. Photohardenable compositions, hardenable resin compositions, and methods for forming an object, which photohardenable compositions, hardenable resin compositions, and methods include a photoswitchable photoinitiator described herein, are also disclosed.

Glasses frame (1) provided by at least one sheet (4) of optical cellulose acetate fibers, provided with regions containing photochromic pigments and regions free of photochromic pigments, planned to form geometries, patterns, designs and images desired by manufacturers.

The present invention belongs to the technical field of mechanochromic materials, and specifically relates to a mechanochromic material containing rhodamine with a hydantoin structure, and its preparation method and application. The rhodamine mechanochromic material containing a hydantoin structure is shown in structure (I), with rhodamine B as the matrix, reduced to rhodamine alcohol, oxidized to generate rhodamine aldehyde, and reacted with hydantoin to prepare a six-membered spirocyclic rhodamine containing a hydantoin structure. The rhodamine compound containing a hydantoin structure involved in the present invention has good ion interference resistance, exhibits photochromic properties in a dichloromethane solvent, and has the properties of mechanical stress discoloration and solvent mixing stress discoloration with high contrast and good repeatability. The solid powder of the rhodamine mechanochromic material containing a hydantoin structure has the characteristic of changing color upon grinding. After the action of mechanical force, the color of the powder changes from yellow to pink, and a reversible color change is achieved during the grinding-heating process.

The present invention discloses a heat-insulating, sun-proof and self-cleaning multifunctional glass and a preparation method thereof, wherein the multifunctional glass comprises a modified glass substrate and a photochromic heat-insulating layer and a surface functional protective layer sequentially compounded on the surface of the modified glass substrate; the surface functional protective layer comprises a super-hydrophobic nanostructure layer and a self-cleaning functional layer sequentially arranged from the inside to the outside; the photochromic heat-insulating layer is a photothermal response layer with a gradient doping distribution of tungsten oxide nanoparticles, wherein the doping density of the tungsten oxide nanoparticles close to the side of the modified glass substrate is low, and the doping density of the tungsten oxide nanoparticles far from the side of the modified glass substrate is high; the super-hydrophobic nanostructure layer is mainly composed of fluorosilane-modified SiO2 nanoparticles; the self-cleaning functional layer is a TiO2 film deposited on the surface of the super-hydrophobic nanostructure layer by plasma enhanced chemical vapor deposition. Compared with the prior art, the glass of the present invention has multiple functions such as excellent heat insulation, sun protection and self-cleaning.

The invention relates to the technical field of ceramic back plates, in particular to an integrated photochromic casting ceramic back plate material and a preparation method thereof. The chemical formula of the ceramic backboard material is BaMgSiO4EuxFey, wherein 0 lt; x is less than or equal to 0.01, 0lt; and y < = 0.01. The rare earth element Eu and the transition metal element Fe are cooperatively doped, so that the color change contrast ratio and the hardness of the ceramic are remarkably improved; x and y meet the following requirements: 0.002 lt; x is less than or equal to 0.008, 0.002 lt; y is less than or equal to 0.008, so that the color-changing contrast ratio and the hardness of the ceramic back plate material can be further improved, the color-changing contrast ratio is more than 90%, and the Vickers hardness is more than 600Hv; the response time of the ceramic backboard material is prolonged to be less than 8 s, the color change fatigue resistance is high, the chemical stability is good, and the structure supporting and photochromic functions are achieved.

The invention discloses a high-toughness grouting material and a preparation method thereof, and belongs to the technical field of building materials. The photochromic thermal insulation material is prepared from the following raw materials in percentage by mass: 30 to 36 percent of sulphoaluminate cement, 28 to 32 percent of quartz sand, 0.4 to 0.9 percent of nano graphene / carbon tube hybrid, 12 to 15 percent of superfine composite admixture, 1.0 to 1.8 percent of temperature-sensitive shape memory alloy fiber, 1.5 to 2.0 percent of microbial self-repairing capsule, 15 to 18 percent of photochromic epoxy hybrid emulsion, 0.2 to 0.35 percent of polycarboxylate superplasticizer and 0.8 to 1.2 percent of magnetic iron oxide coated SiO2 expanding agent. According to the invention, the active inhibition that the crack width is less than or equal to 0.05 mm is realized through the shrinkage compensation of the magnetic field oriented expanding agent, the temperature-sensitive fiber phase change toughening and the photochromism-microorganism synergistic repair.

The invention discloses a poly (butylene succinate) composite fiber and a preparation method thereof. The preparation method comprises the following steps: 1) dissolving the photochromic dye, the antioxidant A and the ultraviolet light absorber in an oil-soluble solvent to obtain an oil-phase solution; 2) adding the oil phase solution into an aqueous solution containing an emulsifier, and emulsifying to obtain an oil-in-water emulsion; adjusting the pH value of the emulsion to 3-8 and the temperature to 20-100 DEG C; (3) adding a capsule wall material and a magnetic substance into water, adding the mixture into the emulsion at a constant speed, putting the mixture into an external magnetic field with controllable strength, and keeping the temperature at 20-90 DEG C for 0.3-5 hours to obtain the photochromic microcapsule with a shell with a special structure; and 4) adding the photochromic microcapsule into a spinning solution of the poly (butylene succinate) fiber, and then spinning to obtain the poly (butylene succinate) composite fiber.

A coating composition for an optical article containing a photochromic compound and two or more (meth)acrylates, the two or more (meth)acrylates containing a non-cyclic difunctional methacrylate having a molecular weight of 500 or more and a non-cyclic tri- or higher functional (meth)acrylate.

The invention relates to the technical field of textile materials, and particularly discloses a fabric capable of improving thermal protection performance and a preparation method and application of the fabric. Nano-scale aluminum oxide; polyethylene glycol diacrylate; a closed type waterborne polyurethane emulsion; a silane coupling agent containing a vinyl group; a photochromic dye; a thermochromic dye; the preparation method comprises the following steps: S1, preparing composite slurry; s2, applying the composite slurry to the surface of a fabric base material in a dot matrix form by adopting a screen printing process to form a coating; s3, the coating is irradiated with ultraviolet light; and S4, carrying out baking treatment on the fabric subjected to the ultraviolet light curing treatment at the temperature of 140-160 DEG C. According to the invention, the polyethylene glycol diacrylate, the closed waterborne polyurethane and the vinyl-containing silane coupling agent are adopted to form an interpenetrating polymer network structure in situ, so that when the obtained fabric is rubbed or washed and the like, the coating is not easy to crack and peel off.

A writing implement configured to emit light for altering the appearance of a substrate including at least one photochromic material, wherein the writing implement includes: an elongate body portion enabling a user to grip the writing implement, wherein the body portion comprises a proximal end and a distal end; a first light source configured to emit light from the proximal end, wherein the emitted light comprises at least a first colour component within a first wavelength range, wherein the first wavelength range at least partially corresponds to a deactivation spectrum of a first photochromic material of the substrate; and a controller configured to receive input from a user, and to generate signals for controlling the first light source based on the received user input.

Systems, methods and apparatuses are described for dimming one or more portions of an extended reality (XR) display. Control circuitry may be configured to generate for display, at the display, an XR object. A dimmable optical element may comprise a plurality of up-converting nanoparticles and a photochromic material, and is configured to cause a change in color of at least a portion of the display. The dimmable optical element may be irradiated with light of a first energy level which causes the plurality of upconverting nanoparticles to emit light of a second energy level higher than the first energy level. The photochromic material may absorb the light of the second energy level to cause the change in color of the at least a portion of the display.

A camera device including: an image capturing device configured to capture an image to generate an image signal; a housing in which the image capturing device is provided; a light transmitting cover coupled to the housing and configured to transmit light therethrough; a photometric sensor configured to sense an illuminance of light; an ultraviolet lamp provided on one side of the light transmitting cover and configured to irradiate an ultraviolet ray; and a controller configured to control the ultraviolet lamp according to an illuminance sensed by the photometric sensor, where the light transmitting cover is configured to exhibit a photochromic effect based on the ultraviolet ray irradiated by the ultraviolet lamp.

The present invention relates to a curable photochromic composition comprising a photochromic compound, a trialkoxysilane functional material having at least two trialkoxysilane groups, and a segmented polymer comprising at least one first segment and at least one second segment. Each first segment of the segmented polymer independently comprises a (meth) acrylic polymer segment and / or a vinyl fluoride vinyl ether polymer segment. Each second segment of the segmented polymer independently comprises a polycarbonate segment, a polyester segment, a polyether segment, a polyurethane segment, or a combination thereof. The invention also relates to an article comprising: a substrate; and a photochromic layer on at least one surface of the substrate, wherein the photochromic layer is formed from the curable photochromic composition of the present invention.

The present invention relates to a photochromic article comprising: (a) a substrate; (b) a photochromic layer comprising a photochromic compound on the substrate; and (c) a UV absorbing layer comprising a UV absorber on the photochromic layer. The photochromic layer has an unactivated state absorbance greater than 0 over at least a portion of a wavelength of 250 nm to 450 nm. An end minimum absorbance wavelength value of the UV absorbing layer is at least 45 nm less than a first unactivated end minimum absorbance wavelength value of the photochromic layer. The invention also relates to ophthalmic articles, such as corrective lenses.

The invention discloses a self-activated long-afterglow material with multi-mode luminescence, a preparation method and application, which can realize effective regulation and control of the multi-mode luminescence performance of fluorescent powder and can be applied to the fields of information encryption, anti-counterfeiting and the like. Based on the defect-rich matrix CaGa4O7, the defect state concentration and depth in the matrix are regulated and controlled by simply doping and replacing Ca < 2 + > with Pb < 2 + >, so that the multi-mode optical characteristics such as the afterglow intensity and decay time of the Ca1-xGa4O7: xPb < 2 + > fluorescent powder, the photochromic degree and the excitation time dependent on fluorescence are effectively regulated and controlled; through combination of multi-mode optical characteristics, the problem that a traditional encryption and anti-counterfeiting technology is single in mode is solved, and the method has great application value in the fields of information encryption, anti-counterfeiting and the like.

The invention relates to the technical field of multi-point defocusing, in particular to an optical stable photochromic multi-point defocusing myopia control lens prescription generation method, which comprises the following steps of: based on eyes of a wearer, scanning cornea by using a non-contact optical device, extracting iris and pupil characteristics, monitoring an adjustment reaction, and performing three-dimensional reconstruction and multi-direction light path tracking analysis to obtain a myopia control lens prescription. And the distribution configuration of the annular belt is optimized, and the overlapping area is adjusted by combining the photochromic requirement, so that the fusion function partition structure is formed. Through collection of multi-source visual parameters and combination of spatial modeling and focusing path analysis, cut-through association of individual visual behaviors and structural attributes in lens customization is realized, functional requirements of different areas and photochromic response are dynamically fused through hierarchical adjustment of the spatial structure of an intervention area, and the visual performance of the lens is improved. And the material and microstructure data are synchronously output to a manufacturing link, so that the collaborative matching capability of the visual area partition is enhanced, and the requirements of a wearer on visual comfort and optical reaction are met.

The invention relates to the technical field of organic optical functions, in particular to an azobenzene dual-mode photochromic compound as well as a preparation method and application thereof. The compound has a structure as shown in (I): # imgabs0 #. The azobenzene dual-mode photochromic compound prepared by the invention has extremely fast photoresponse capability, can realize the dual-mode photochromic phenomenon of color and fluorescence, realizes the conversion of color from yellow to colorless and the conversion of fluorescence from non-fluorescence to blue fluorescence under the irradiation of ultraviolet light, and has large optical property change before and after photochromic, so that the photochromic effect is good. The color contrast ratio is high, and high definition of information storage is guaranteed.

The invention relates to the technical field of photochromic functional materials, in particular to a novel organic photochromic functional material and a preparation method thereof. The method comprises the following steps: S1, mixing a fluorane dye A with a molecular formula (1) and an alcohol protonation solvent B according to a volume ratio of 1: (1-5); s2, carrying out solvothermal reaction on the mixed solution at 150-200 DEG C to obtain a reactant, and collecting a precipitate; and S3, drying the precipitate in the step S2 to obtain the organic photochromic functional material. The novel organic photochromic functional material is simple in preparation process and green, and is yellow in darkness or a fluorescent lamp; under an ultraviolet lamp, the color is bright orange, and the yellow color and the bright orange color are reversibly interchanged.

The invention discloses a MoO3 / TiO2 heterojunction material with a photocatalytic memory effect and application of the MoO3 / TiO2 heterojunction material in degradation of quinolone antibiotics, and belongs to the technical field of inorganic non-metallic material preparation, solar energy utilization and environmental protection. A molybdenum source precursor solution and a titanium source precursor solution are adopted to react, polyvinylpyrrolidone is used for modifying the surface of the material, the MoO3 / TiO2 heterojunction material is obtained, and the material can generate photochromic and photocatalytic memory effects under the pre-illumination effect. The memory effect provides continuous driving force for the catalytic reaction, and the activity of the material in the dark-state catalytic process is remarkably enhanced. The MoO3 / TiO2 heterojunction material disclosed by the invention shows excellent catalytic degradation performance in practical application, and particularly shows extremely high catalytic efficiency in the aspect of water pollution control.

The utility model discloses an automatic color changing protective lamp which comprises a lamp holder and a light source located in the lamp holder, the spectral wavelength of light emitted by the light source is larger than or equal to 400 nm, and a photochromic piece with photochromic materials is arranged on a light path of the light source. The photochromic material changes color to reduce the light transmittance under the irradiation of light with the spectral wavelength lower than 400 nm, and keeps a high-transmittance state under the irradiation of light with the spectral wavelength larger than or equal to 400 nm. According to the automatic color-changing protective lamp, the photochromic part made of the photochromic material is arranged and allows light rays with the spectral wavelength larger than or equal to 400 nm emitted by the light source to freely pass through, but the light rays with the spectral wavelength smaller than 400 nm in sunlight change color to reduce the light transmittance, so that the light beam energy intensity of the sunlight entering the lamp is reduced, and the light transmittance of the lamp is improved. Therefore, even if the focus of the light beam falls on a component which is not resistant to high temperature in the lamp, the temperature of the component is not increased too much to cause burning damage.

The invention relates to the technical field of multi-point defocusing, in particular to an optical stable photochromic multi-point defocusing myopia control lens prescription generation method, which comprises the following steps of: based on eyes of a wearer, scanning cornea by using a non-contact optical device, extracting iris and pupil characteristics, monitoring an adjustment reaction, and performing three-dimensional reconstruction and multi-direction light path tracking analysis to obtain a myopia control lens prescription. And the distribution configuration of the annular belt is optimized, and the overlapping area is adjusted by combining the photochromic requirement, so that the fusion function partition structure is formed. Through collection of multi-source visual parameters and combination of spatial modeling and focusing path analysis, cut-through association of individual visual behaviors and structural attributes in lens customization is realized, functional requirements of different areas and photochromic response are dynamically fused through hierarchical adjustment of the spatial structure of an intervention area, and the visual performance of the lens is improved. And the material and microstructure data are synchronously output to a manufacturing link, so that the collaborative matching capability of the visual area partition is enhanced, and the requirements of a wearer on visual comfort and optical reaction are met.

The invention relates to the technical field of textile materials, in particular to a photochromic curtain fabric and a preparation method thereof. The color-changing curtain fabric overcomes the problems of unstable color-changing performance and poor durability of the existing curtain fabric. The modified polyimide is synthesized through copolymerization and imidization reaction; carrying out two-stage melt blending on components such as a photochromic microcapsule and a composite dispersant with the modified polyimide to prepare a mixed material containing polyimide; performing spinning forming and surface modification to form surface modified polyimide fibers; and finally obtaining the photochromic curtain fabric through dip-coating curing and weaving processes. Polyimide is modified, so that the mechanical property and the color change stability of the fabric are enhanced; the other components cooperate with one another to improve the aging resistance of the fabric, and the requirements of the textile material on functionality and durability are met.

The invention discloses a method for controllably synthesizing intermediate valence tungsten oxide (WO3-x, 0.1 < = x < = 1) through a carbon reduction method, and belongs to the technical field of non-ferrous metal material preparation. The preparation method comprises the following steps: (1) mixing high-valence tungsten oxide powder with carbon powder, and carrying out uniform ball milling; and (2) putting the mixed powder under inert gas protection or vacuum conditions, and carrying out reduction reaction at high temperature. Tungsten oxide with different intermediate valence states is obtained by controlling the carbon type, the use amount, the temperature and the time. The method is suitable for precise preparation and phase structure regulation of the functional tungsten oxide intermediate, and can be used as a precursor of a new energy battery material or electrochromic and photochromic high-performance materials and the like.

A wire grid polarizer having a mirror layer is laminated with a colored film. The colored film provides a scratch protection of the mirror layer of the wire grid polarizer and provides a colored mirror appearance of an optical lens made with such wire grid polarizer. The colored film laminated wire grid polarizer shows different intensities between the transmitted and reflected colors when the wire grid polarizer is paired with a particular colored film. The wire grid polarizer is deposited on a structured surface of a photochromic film to form a photochromic wire grid polarizer.