756 results about "Photo stability" patented technology

Provided are compositions comprising modified DNA polymerases that exhibit improved photostability compared to the parental polymerases from which they were derived. Provided are methods for generating enzymes, such as DNA polymerases, with the aforementioned phenotype. Provided are methods of using polymerases with increased resistance to photodamage to make a DNA or to sequence a DNA template.

Disclosed are a white light-emitting diode (LED) in which an emission layer comprising a red luminous body and a green luminous body is formed on a blue LED, and a preparation method thereof. The emission layer comprises both of at least one inorganic phosphor and at least one semiconductor nanocrystal. The white LED prepared according to the present invention has excellent color purity, high luminous efficiency and improved light stability so that it can be advantageously used as a light source for various display devices.

The present invention is directed to photostable sunscreen and / or artificial tanning compositions including quantum dot nanocrystals of a material selected from semiconductor nanocrystals, modified semiconductor nanocrystals, multicomponent semiconductor / semiconductor nanocrystals, and hybrid semiconductor / metal nanocrystals, the quantum dot nanocrystals having an absorption band gap occurring at wavelengths higher than 400 nm whereby the quantum dot nanocrystals have substantial broadband absorption properties of ultraviolet light at wavelengths across the range of both UV-A (320-400 nm) and UV-B (280-320 nm), and a dermatologically acceptable carrier for the quantum dot nanocrystals. The present invention is further directed to photostable sunscreen and / or artificial tanning compositions including a material selected from metallic nanocrystals, multicomponent metal / metal nanocrystals, and alloyed metal nanocrystals, the metallic material having a surface plasmon resonance occurring sufficiently into the visible or infrared spectral region whereby broad absorption features due to electronic transitions, the broad absorption features located at higher energies, provide substantial broadband absorption properties of ultraviolet light at wavelengths across the range of both UV-A (320-400 nm) and UV-B (280-320 nm), and a dermatologically acceptable carrier for the metallic material.

The invention relates to fluorescent dyes (fluorophores) based on polymethines for use in optical measurement and detection procedures, in particular those employing fluorescence, for example in medicine, in pharmacology and in the biological, materials and environmental sciences. The objective was to create fluorophores based on polymethines that have a large Stokes shift, high photostability, long storage life and a high fluorescent quantum yield, and that can be excited in the simplest possible manner by white-light sources or laser radiation in the UV, visible or NIR spectral region. According to the invention dyes on the basis of polymethines having the general formulas I, II or III are employed.

A single-domain, two-domain or four-domain homeotropic- or tilted homeotropic-alignment liquid crystal display device of either the transmissive-type or reflective-type having a high contrast ratio, a good display quality, and a high photo-stability (and a method of producing the same), includes a homeotropic- or tilted homeotropic-alignment layer which includes an oxide layer prepared by a single oblique evaporation of an activated oxide source. The angle between the evaporation direction and the substrate plane forms an angle from about ±20° to about ±90°, and the thickness of the oxide layer is from about 10 nm to about 200 nm. A method of homeotropic-alignment or tilted homeotropic-alignment of liquid crystals by a single oblique evaporation process is also provided.

A polyamide resin composition according to the present invention comprises (A) about 10 to about 70% by weight of crystalline polyamide resin, (B) about 10 to about 70% by weight of amorphous polyamide resin with a glass transition temperature of about 110 to about 200° C., (C) about 10 to about 60% by weight of inorganic filler, (D) about 10 to about 50% by weight of white pigment, and (E) about 0.05 to about 2 parts by weight of light stabilizer, based on about 100 parts by weight of the crystalline polyamide resin (A), the amorphous polyamide resin (B), the inorganic filler (C) and the white pigment (D), and can have excellent surface reflectance, heat resistance, mechanical strength, moldability, light stability and discoloration resistance.

An optical recording medium can be recorded at a high linear velocity of at least 10 m / s while maintaining an excellent light stability and favorable reflectance. A recording medium is constructed of a recording layer on a substrate, the recording layer including a first dye with a maximum absorption wavelength in a thin-film state of 450 nm to 620 nm inclusive as a first dye and being formed so as to include a second dye with an extinction coefficient of at least 0.5 for a recording wavelength. In this case, it is preferable for the second dye to have a maximum absorption wavelength of 620 nm to 750 nm inclusive in a thin-film state.

Provided is a curable silicone resin composition including (A) a siloxane-based compound containing at least 2 addition reactive carbon-carbon double bonds within each molecule, (B) a siloxane-based compound containing at least 2 hydrogen atoms bonded to silicon atoms within each molecule, (C) a hydrosilylation reaction catalyst, (D) a phenol-based antioxidant, and (E) a hindered amine compound. Also provided are an optical semiconductor sealing material including such a composition, and an optical semiconductor device that has been sealed with such a composition. The curable silicone composition generates a cured product with high hardness and strength, excellent transparency, and excellent light transmittance and photostability particularly in the short wavelength region.

Providing a liquid crystal composition satisfying at least one of characteristics such as high maximum temperature of nematic phase, low minimum temperature of the nematic phase, small viscosity, suitable optical anisotropy, large negative dielectric anisotropy, large specific resistance, high stability to ultraviolet light and heat, or having a suitable balance regarding at least two of the characteristics; and an AM device having short response time, large voltage holding ratio, large contrast ratio, long service life and so forth. The liquid crystal composition has a negative dielectric anisotropy and contains a specific two-ring compound having a low minimum temperature as a first component, a specific compound having a large negative dielectric anisotropy as a second component, a specific compound having a low viscosity as a third component, and a specific compound having a large negative dielectric anisotropy as a fourth component. The liquid crystal display device contains the composition.

The invention relates to a near infrared BODIPY fluorescence dye and a preparation method thereof. A BODIPY derivative and 2-aldotruxene undergo a Knoevenagel condensation reaction under the catalysis action of p-toluenesulfonic acid and piperidine to synthesize the dye, and the maximal absorption wavelength and the maximal emission wavelength of the dye in an organic solvent are 650nm or above respectively. The preparation method has the advantages of simple reaction steps, mild reaction conditions and good selectivity. Like fluorescence dyes have the advantages of high molar extinction coefficient, good solubility and light stability, excellent photophysical performances, and good application prospect in cell imaging and biological marking.

A patch has a backing which has been subjected to an ultraviolet-screening processing, the backing usually being of one layer. The ultraviolet-screening processing usually uses an organic ultraviolet absorbent and / or an inorganic ultraviolet-screening agent. The patch can contain in its base a medicine of poor photo-stability and a non-steroidal anti-inflammatory analgesic.

The invention relates to a high luminance, high efficiency indole 3,2-b carbazole derivatives organic electroluminescenct material, belonging to the organic electroluminescent material technical field. The general structural formula of the indole 3,2-b carbazole derivatives organic electroluminescent compound is in the picture; in which, R3, R7 is alkyl or the substitute aryl, R1, R2 or R4-R6, R8 is hydrogen atom, benzene, naphthaline, anthracene, fluorine, carbazole, triarylated amine, thiophene, pyridine, pyran, quinoline, pyrrole, furan or imidazole. The compound of the invention has high fluorescence in both solution and solid film and has high film forming ability, thermal stability and photostability.

The invention relates to an ultrahigh-sensitivity fluorescent probe for detecting nitrogen monoxide. The ultrahigh-sensitivity fluorescent probe has the structural general formula in the original text. During preparation, firstly, 4-bromine-1, 8-anhydride naphthalene and o-nitro p-phenylenediamine with equal molar weights are used as raw materials, dissolved in ethylene glycol monomethyl ether and heated for reaction to obtain light yellow solid. Secondly, the light yellow solid is dissolved in anhydrous DMSO, primary amine is added into the anhydrous DMSO, the anhydrous DMSO is heated and refluxed, and reaction liquid is filtered in a sucking manner, depressurized and dried to obtain yellow solid. The yellow solid is dissolved in mixed liquid of tetrahydrofuran and methanol, and a yellow probe is obtained under catalysis of hydrogen and catalysts. Probe molecules have fine chemical and optical stability, good solubility and biological compatibility and high nitric oxide selectivity, and are free of interference of other active oxygen, active nitrogen and the like. Laser confocal imaging experiments indicate that the probe has fine cellular permeability, has no toxic and side effects on cells and organisms, and can be used for detecting protogenetic nitrogen monoxide in a high-sensitivity manner.

There is provided an organic-inorganic composite material containing a single nanoparticle therein, which is prepared by individually dispersing hydrophilic inorganic nanoparticles having a uniform particle size and conjugating biodegradable polymers to the surface of the nanoparticle, and a method of preparing the same. More particularly, the preparation method of the present invention comprises the following steps: 1) preparing hydrophilic nanoparticles by conjugating organic substances having a thiol group and a hydrophilic amine group to the surface of a core or a core / shell inorganic nanoparticle protected with a surfactant through a metal-thiolate (M-S) bond between them; 2) adjusting the concentration of the hydrophilic nanoparticles prepared in step 1) to 2×10−6 M or less and treating them in a sonication bath to prepare individually dispersed nanoparticles in the form of a single particle; and 3) conjugating biopolymers to the nanoparticle individually dispersed in step 2) through the formation of an amide bond between them under treatment in a sonication bath. The organic-inorganic composite material of the present invention exhibits high efficient photoluminescence and photostability as well as excellent chemical stability, dispersibility in water, biocompatibility and targetibility. Thus, it can be effectively used as a raw material for bioimaging or film coating.

The invention provides a fluorescent probe represented by the formula (I), wherein R1 and R2 are independently selected from H or an aromatic vinyl group, and at least one of R1 and R2 is the aromatic vinyl group; R3 is selected from H, F, Cl, Br, OH, OCH3, N(CH3)2 or C1-C6 alkyl; and R4 is selected from C1-C6 alkyl. Compared with the prior art, because the fluorescent probe provided by the invention has a relatively large electronic conjugated system and plane, the intensity of the intramolecular charge transfer effect can affect the molecular fluorescence emission intensity; when the fluorescent probe and the G-quadruplex generate a specific action, the flexibility of intramolecular rotatable double bonds is restricted, the intramolecular charge transfer effect is enhanced, and the fluorescence is also enhanced significantly; moreover, the fluorescent probe provided by the invention has the advantages of low biotoxicity, phototoxicity and photobleaching property, good light stability, good water solubility and good cell membrane permeability.

Semiconductor nanocrystal compositions comprising magnesium containing shells and methods of preparing them are described. The compositions provide strong emission in the blue and green wavelengths as well as chemical and photostability that have not been achieved with conventional shell materials.

The invention relates to novel and improved photostable rhodamine dyes of the general structural formulae I or II and their uses as fluorescent markers, e.g. for immunostainings and spectroscopic and microscopic applications, in particular in conventional and stimulated emission depletion (STED) microscopy and fluorescence correlation spectroscopy. The partially deuterated analogues are useful as molecular mass distribution tags in mass spectroscopic applications, wherein R1=an unsubstituted or substituted alkyl group, including a cycloalkyl group, or heterocycloalkyl group; R2=H, an unsubstituted or substituted alkyl group, including a cycloalkyl group, or heterocycloalkyl group, or an unsubstituted or substituted aryl group or heteroaryl group, or any combination of such groups; X=CH2, C═O, C═NORa, C═NNRaNRb, CH(ORa), O, S, SO, SO2, or any other derivatives of these groups, with Ra and Rb independently being H or an organic residue, in particular an unsubstituted or substituted (cyclo)alkyl group or heterocycloalkyl group, an unsubstituted or substituted aryl group or heteroaryl group; Z=a negatively charged group with 1, 2, 3, 4 or 5 charges per anion.

The invention relates to a synthesizing method of a functionalized AuNc (gold nanocluster) based on BSA (bovine serum albumin) and application. The synthesizing method is characterized in that HAuCl4 is used as a precursor of Au (copper) atom, the BSA is used as a reductant and a protectant, and BSA-AuNCs is synthesized by a one-pot synthesis method. The synthesizing method has the beneficial effects that the synthesizing method is simple, and the reaction conditions are wild; the synthesized fluorescent AuNc has the advantages of good biocompatibility and photostability, good fluorescent characteristics, high yield of quantum, good water solubility, non toxicity, little inference by outside and the like; the synthesized BSA-AuNCs has higher selectivity on Cu<2+>, and can be applied to the quantitative detection and analysis of Cu<2+>; the detection method is simple and quick, the sensitivity is high, the toxicity is avoided, and the real-time qualitative and quantative detection of Cu<2+> is realized.

A thermoplastic composition is disclosed, containing poly(arylene ether) resin; vinyl aromatic resin; a hindered amine light stabilizer; an ultraviolet light absorbing compound, and about 0.1% by weight to about 2.0% by weight of titanium dioxide, based on the total weight of poly(arylene ether) resin and vinyl aromatic resin. Other thermoplastic compositions described herein contain poly(arylene ether) resin; vinyl aromatic resin; an ultraviolet light absorbing compound, and at least one methine yellow colorant. Molded articles prepared from these compositions are also described.

The invention discloses a novel passivated perovskite solar cell and a preparation method thereof. The perovskite solar cell optimizes the absorption of perovskite, so that a perovskite absorption layer contains an anti-solvent tris(pentafluorophenyl)borane to serve as a novel additive. On one hand, the addition of fluoride ions can change the crystallinity and the defect state of a perovskite film to form a high-quality perovskite film with a large grain size; the anti-solvent tris(pentafluorophenyl)borane can enhance the surface appearance of the perovskite and plays a passivation function at the grain boundary; and on the other hand, the fluoride ions can improve the hydrophobicity of the perovskite film and inhibit the phase change of the perovskite to better protect the perovskite from being destroyed by water, thereby further improving the air stability and the light stability of the cell to obtain a high-efficiency perovskite solar cell.

The invention belongs to the technical field of fine chemicals and relates to a naphthalimide fluorochrome and its preparation and application. According to the invention, the naphthalimide fluorochrome is a fluorescence molecular probe which is designed and synthesized by PET mechanism and used in detecting environmental viscosity changes and can be used to carrying out two-photon ratio imaging and lifetime imaging on viscosity changes in cells. The naphthalimide fluorochrome provided by the invention has advantages of simple synthesis, mild synthesis condition, good photostability and the like, and is not sensitive to pH, polarity and biomacromolecules. Thus, the naphthalimide fluorochrome can be used to detect viscosity distribution in cells. In addition, it is reflected through two-photon ratio imaging that viscosity in a lysosome is the largest in a cell. Fluorescence ratio detection can overcome errors caused by only being dependent on fluorescence intensity changes. On the other hand, through medical stimulation on cells, viscosity changes in cells can be detected. Through fluorescence lifetime, values of viscosity changes can be reflected more visually. The naphthalimide fluorochrome has wide application value in the field of biology and environment.

The present invention relates to a benzotriazole compound with blocked amine groups, as shown in Formula I, wherein, general symbols are defined according to the Claim of Right 1. The present invention also relates to a method of preparing the compound, and an application of the compound in the present invention or the compound prepared in the preparation method as a light stabilizer. The compound can be used for effectively stabilizing thermosetting resin, thermoplastic resin, polyamide or polyester fiber, organic dye, cellulose paper preparation, paper for photographic film, printing ink, white or colored wax, and the like, and has the effective activeness for ultraviolet absorption and light stability for blocked amine.

A method of preparing fluorescent carbon dots by adopting waste sugarcane molasses as a raw material and application of the fluorescent carbon dots are disclosed. The method includes weighing 4.0-6.0 g of the waste sugarcane molasses, performing pyrolysis at 240-260 DGE C, adding 4-6 mL of deionized water, filtering the mixture with a filter membrane having a pore size of 0.22 [mu]m, adding dropwise the filtrate into absolute ethanol, performing centrifugation for 5 min at a rotating speed of 6000 round / min, collecting a clear liquid, performing vacuum concentrating to remove the ethanol, adding the deionized water again, filtering the mixture with the filter membrane having a pore size of 0.22 [mu]m, collecting a filtrate, and freeze-drying the filtrate to obtain the fluorescent carbon dots. A preparing process of the fluorescent carbon dots is simple and raw materials are cheap. The fluorescent carbon dots have characteristics of good biocompatibility, good bleaching resistance performance, high optical stability, excellent fluorescent properties, and the like, and can be used for cell imaging and used for content detection of a food coloring agent that is sunset yellow.

The invention belongs to the technical field of composite fluorescent nano materials, and discloses a CDs / SiO2 composite fluorescent nano material and a one-step preparation method thereof. The preparation method is a solvothermal method and comprises the following steps: mixing sodium citrate and a silane coupling agent, heating to carry out reactions to obtain a turbid liquid, subjecting the turbid liquid to centrifugation, and finally filtering to obtain the CDs / SiO2 composite fluorescent nano material. In the provided method, the sodium citrate and silane coupling agent directly react, the post treatment using a strong acid or a surface passivating agent is not required, and the composite fluorescent nano material (solid powder) can be rapidly prepared in one step. The raw materials are easily-available, the price is cheap, the reaction conditions are mild, and the yield is high (90% or more). Solved is the problem that the massive production of carbon quantum dots cannot be achieved due to the limitation of technology and raw materials in the prior art. The prepared CDs / SiO2 composite fluorescent nano material has the advantages of good stability, air-slaking resistance, and high light stability, and can be applied to the fields such as photoelectric devices, photocatalysis, biosensors, agriculture, and the like.

The invention provides a ratio-type pH fluorescence probe for water-soluble locating lysosome as well as a preparation method, an application and a test method of the ratio-type pH fluorescence probe. The chemical structural formula of the ratio-type pH fluorescence probe is shown in the specification. The probe can detect changes of strength of fluorescence with two emission wavelengths simultaneously, external influences are eliminated through self-calibration, the detection accuracy is high, the speed of response to pH changes is high, and the probe has excellent water solubility and has very good anti-interference capacity in the existence of various metal ions. The fluorescence strength changes remarkably in the pH range from 5.8 to 6.8, and the probe is suitable for pH detection under a weak acidic condition. Experiments prove that the probe can selectively dye lysosome in cells, the light stability in the cells is good, and the probe is non-toxic to the cells and can be used for pH detection of live cells. The probe has very important application value in cell imaging and detection of changes of the pH value in lysosome.

In an apparatus using optically excited atomic media, such as an atomic frequency standard, a source providing a controlled emission of light for exciting the D1 and / or D2 resonance lines of an alkali gas, such as rubidium or cesium, is controlled by an output generated by digital electronics from the light intensity signal of a light sensor for light transmitted by the alkali gas, an output for representing ambient temperature, and a light intensity-ambient temperature algorithm to substantially eliminate changes in light intensity due to light source aging for the purpose of reducing changes in temperature sensitivity of the apparatus as a function of time and the light-shift contribution to the frequency aging of the standard.

A bio-based polyester window film optionally including a a UV light absorbing layer including a bio-based polyester and a UV light absorber. The bio-based polyester window film has a radiocarbon content of at least 19 pMC. The film exhibits excellent clarity and light stability, substantially equivalent to petroleum-based counterparts, while being derived wholly or partly from non-petroleum sources.

To provide a highly reactive polymerizable compound having a high solubility in a liquid crystal compound; a liquid crystal composition satisfying at least one characteristic such as a high maximum temperature of a nematic phase, a low minimum temperature thereof, a small viscosity, a suitable optical anisotropy, a large negative dielectric anisotropy and specific resistance, a high stability to ultraviolet light and heat, and having a suitable balance regarding at least two characteristics; a PSA device having a short response time, a large pretilt angle, a small residual monomer concentration, a large voltage holding ratio and contrast ratio and a long life; a polymerizable compound into which one bonding group or nonidentical reaction group is introduced by constructing a polymer structure having a high polymerization degree in a PSA device manufacturing process to obtain a stable display, a liquid crystal composition containing thereof, and a liquid crystal device including thereof.