87 results about "Bathochromic shift" patented technology

Various non-limiting embodiments disclosed herein relate to ophthalmic devices comprising photochromic materials having extended pi-conjugated systems. For example, various non-limiting embodiments disclosed herein provide a photochromic material, such as an indeno-fused naphthopyran, which comprises a group that extends the pi-conjugated system of the indeno-fused naphthopyran bonded at the 11-position of thereof. Further, the photochromic materials according to certain non-limiting embodiments disclosed herein may display hyperchromic absorption of electromagnetic radiation as compared to conventional photochromic materials and/or may have a closed-form absorption spectrum that is bathochromically shifted as compared to conventional photochromic materials. Other non-limiting embodiments relate to methods of making the ophthalmic devices comprising photochromic materials.

A wetness sensor for an absorbent article that is formed from an ink is provided. The ink includes a proton-accepting chromogen and a proton-donating agent (or color developer). Prior to use, the ink is generally dry and in a protonated form so that it has a visible color. However, upon contact with bodily fluids (e.g., urine, fecal matter, mucus, menses, vaginal fluid, etc.), water in the fluid can lead to deprotonation of the chromogen, thereby resulting in a shift of the absorption maxima of the chromogen towards either the red (“bathochromic shift”) or blue end of the spectrum (“hypsochromic shift”). To increase the rate of the color change during use, the present inventors have discovered that a specific type of proton-donating agent may be employed. More particularly, the proton-donating agent is an aliphatic carboxylic acid that is highly soluble in the bodily fluid (e.g., urine), and therefore results in a color change that is very rapid and may be detected within a relatively short period of time. The extent of the color change is also generally sufficient to provide a “real-time” indication of wetness on the absorbent article.

A method for rapidly detecting the presence of formaldehyde in a urine sample (e.g., urine or a urinary material associated therewith, such as headspace gas located associated with urine) is provided. The method includes contacting the urine sample with a substrate on which is disposed a colorant that is capable of undergoing a detectable color change in the presence of formaldehyde. Without intending to be limited by theory, it is believed that oxidation of the colorant by formaldehyde induces either a shift of the absorption maxima towards the red end of the spectrum (“bathochromic shift”) or towards the blue end of the spectrum (“hypsochromic shift”). The absorption shift provides a color difference that is detectable, either visually or through instrumentation, to indicate the presence of formaldehyde within the urine sample. For example, prior to contact with a urine sample, the colorant may be colorless or it may possess a certain color. However, after contacting the urine sample and reacting with formaldehyde, the colorant exhibits a color that is different than its initial color. The color change may thus be readily correlated to the presence of formaldehyde in the urine sample.

An optical information recording medium includes at least a reflecting layer, an optical information recording layer, a super-resolution layer and a protective layer. The super-resolution layer is a thin layer whose an optical constant changes nonlinearly due to a red shift of its band gap, and made of solid solution, compound or mixture of metal oxides containing two or more types of metal ions of the same valence. Ion radius unconformity ΔR=|(RM_i−RM_j)/RM_j| between ion radii RM_i and RM_j of two types of metal ions M_i and M_j arbitrarily selected from the two or more types of metal ions is 8% or less. The difference ΔE=Eg−E between band gap energy Eg of the mixture of the metal oxides and energy E corresponding to a wavelength of the laser beam is a more 0.4 or less 1.4 eV.

Materials for organic electronic devices including organic photovoltaic devices. An oligomer or polymer comprising:

wherein R₁, R₂, R₃, and R₄ are independently hydrogen or solubilizing groups. Monomers and ink compositions can be also prepared. The materials can be used in an OPV active layer and show excellent absorption properties with bathochromic shift.

The invention, relating to the technical field of phosphor, particularly discloses a phosphor represented by (M1-xRex)3Al5-ySiyO12-y-zNy+z, wherein M represents one or more elements of Y, Lu, Gd, and Tb, Re represents one or two elements of Eu, Ce and Pr, x is no larger than 0.1, y is no less than 0 and no larger than 1.0, and z is no less than 0 and no larger than 1.2, the initial raw materials comprise a pure oxide of M, a pure oxide of Re, nano alpha-Al2O3, a nitride and analytically pure HBO3/NH4F/LiF as a sintering aid which accounts for 1 wt% of the weight of the initial raw materials, and the nitride is nano amorphous Si3N4. Compared with the prior art, by using the nano amorphous Si3N4 to introduce the Si4+-N3-bond, the synthetic phosphor can keep high luminous efficiency and thermostability while the emission spectrum is continuously red shifted.

The invention relates to a 1, 6, 7, 12-tetraphenyl perylene bisimide derivant and a preparation method thereof, belonging to the field of organic photoelectronic functional material preparation. The structural characteristic of the perylene bisimide derivant is that 1, 6, 7, 12-four harbor positions of 3, 4, 9, 10-perylene bisimide are connected with charge transport functional groups with different structure types and different conjugation degrees by phenyls. The derivant is synthesized by the following steps: firstly, a perylene bisimide core with terminal ethyne or halogen or other active groups at the periphery is synthesized by 1, 6, 7, 12-tetraphenyl perylene; and then the 1, 6, 7, 12-tetraphenyl perylene bisimide and cyclopentadienyl ketone with functional substitute group at periphery or arylamine and the like generate Diels-Alder cycloaddtion or C-N, C-C coupling reaction and the like, thus obtaining the target derivant. The compound has excellent thermal stability and morphologic stability and dissolvability; the opto-electronic property of the compound has obvious bathochromic shift compared with other perylene bisimide derivants; and the derivant can be widely applied in the fields of photoelectron and biology such as organic electroluminescence, solar cell, near-infrared fluorescence probe and the like.

The invention discloses an iron oxide/bismuth tungstate composite photocatalyst, a preparation method of the iron oxide/bismuth tungstate composite photocatalyst and the application of the iron oxide/bismuth tungstate composite photocatalyst. The iron oxide/bismuth tungstate composite photocatalyst has a Fe2O3/Bi2WO6 XRD (X-ray diffraction) diffraction pattern as shown in Figure 1 of the specification and a composite morphology as shown in Figure 2 of the specification. 10-30nm of Fe2O3 nano-particles are precipitated on the surface of Bi2WO6 by a soaking-low temperature roasting technology. The invention represents the change of the structure, the morphology, the ultraviolet-visible absorption spectrum and the fluorescence spectrum of the material before and after being modified in details, and researches the catalytic degradation of the visible light of the iron oxide/bismuth tungstate composite photocatalyst to the activity of the dyestuff rhodamine B (RhB). The result shows that Fe2O3 particles with the mean grain sizes of 20nm are dispersed on the surface of a nanosheet unit of a Bi2WO6 superstructure, the visible light response range of the Fe2O3/Bi2WO6 composite photocatalyst is obvious in bathochromic shift, and the composition probability of photon-generated carriers can be effectively restrained as well. When the toasting temperature is low temperature of 200DGE C, and the Fe element content is 0.1% (wt%), the photocatalytic activity is optimal, and the efficiency of the visible-light catalytic degradation RhB can be improved by 20% compared with that of the un-composited visible-light catalytic degradation RhB.

The invention relates to a compound, a light extraction material, an organic photo-electric device and an electronic device. The compound has a structure represented by a formula (I), the index of refraction can be effectively increased by a dibenzothiophene or dibenzofuran parent nucleus, and substituents are all substituted on the same benzene ring, so that a dibenzothiophene or dibenzofuran unit is not located on a main conjugated chain, conjugation cannot be effectively extended, the bathochromic shift of an absorption spectrum of the compound cannot be caused, and thus, the visible region absorption of the compound is relatively low; and the compound is used as the light extraction material and is matched with a specific electron-donating group, so that the compound has relatively high light extraction efficiency, and the stability of long-time work of devices is high. In addition, the compound can also be used as organic thin layer materials such as a hole transport layer, an optical auxiliary layer and an electron barrier layer, so that the improvement on luminescence performance of the devices is facilitated.

The invention provides a method for detecting Escherichia coli in milk based on an ultraviolet-visible spectrum technology. Under the complex background environment similar to that of the milk, the problems that detection spectra of microorganisms are affected by unfavorable factors, the phenomena of characteristic wavelength red shift, obvious noise and the like are generated, consequently spectral characteristics are difficult to pick up, and the accuracy of quantitative detection results is low can be effectively solved. The method comprises the steps that firstly, Escherichia coli powder is activated and subcultured, and a to-be-detected bacterium suspension is prepared; an ultraviolet spectrophotometer obtains ultraviolet-visible spectra of the to-be-detected bacterium suspension at different culture times; noise interference is eliminated through a standard normal correction method and an S-G convolution smoothing method; the spectral characteristic red shift phenomenon is explained from the angle of a formation mechanism of a benzene ring conjugated structure, and thus the characteristic waveband range is determined; the characteristic wavelengths are picked up in the characteristic waveband through a continuous projection algorithm, and the characteristic wavelengths are effectively screened according to the secondary growth law of the microorganisms; and the model relationship between the characteristic wavelengths and the total number of the microorganisms is established through a partial least squares method, and the total number of the Escherichia coli in the milk is quantitatively analyzed

The invention discloses a palladium ion fluorescent probe, and a preparation method and applications thereof. According to the palladium ion fluorescent probe, allyl formate is taken as a response group, and bathochromic shift in an absorption spectrum and bathochromic shift in a fluorescence excitation spectrum are both caused after adding of palladium ions. The palladium ion fluorescent probe is capable of detecting palladium ions with high sensitivity and selectivity, and quantitative determination on palladium ions can be realized via ratio method. The palladium ion ratio fluorescent probe can be used for rapid high-sensitivity specificity detection on low concentration palladium ions; the synthetic method is simple; and industrialized batch production can be realized.

The invention provides a novel fluorescent dye structure and a synthesis method thereof. The anthracene structure fluorescent dye of the type has a high light absorption coefficient similar to that of fluorescein molecules, a high quantum yield and the like and meanwhile has more bathochromic-shift excitation wavelength and emission wavelength. The synthesis method is simple and economical and suitable for large-scale synthesis and group modification of a molecular structure. According to the anthracene fluorescent dye synthesis and application, phosphatase substrate molecules with a fluorescent generation property can be obtained through phosphorylation modification conducted on the molecules, and wide biological application prospect is achieved.

The invention discloses an iridium compound organic electroluminescent phosphorescent material capable of emitting bright red phosphorescence in a pure solid film. The material contains benzothiazole derivate cyclometalated ligand, xenyl and replaced xenyl are introduced on the benzothiazole, so that the maximum phosphorescent emitting wavelength bathochromic shift of the iridium compound reachesover 600 nanometers in the pure solid film, and the iridium compound is in salmon color and pure red color; simultaneously, the problem of reduction in emitting intensity of a solid phosphorescence material, caused by concentration quenching or triplet-triplet exciton annihilation, is avoided. A red-light electroluminescent phosphorescent device with an undoped structure can be prepared by using the iridium compound as a luminescent material; when the device works under the condition of higher current density, the luminous efficiency is not remarkably reduced, device performance is stable, and the luminous color is salmon color or pure red color.

A nanostructure fabricated on a semiconductor light-emitting device induces strain in the active region. The active device includes at least one quantum heterostructure, in which the strain changes the extent of Quantum Confined Stark Effect, and thus modifies the wavelength of light emission. By mixing strain relaxation and strain induction effects there is a spectral broadening of the light emission, providing polychromatic light emission.

The invention discloses a micropore luminous composite material and a preparation method thereof; lanthanum nitrate, succinic acid and isonicotinic acid are resolved in water according to the molar ratio of 1:2:1; a regulating system is weakly acidic; a stainless steel reaction kettle lined with polytetrafluoroethylene is used for hermetically heating to 150 DEG C to 170 DEG C and for reaction for 2 to 4 days, then the temperature decreases to obtain colorless crystal, and the productivity is 41%. The product adopts the structure of a micropore type composite material and has water absorption and desorption functions and the characteristic of representing remarkable red shift of emission wavelength. The wavelength of optical waves emitted by a newly-produced sample containing water at ambient temperature is 354 to 364 nm; and the material is heated to 200 DEG C until being dehydrated, and then the wavelength of emitted optical waves is 423 nm. The micropore luminous composite material has an excellent optical property, good heat stability and favorable chemical stability, can stably exists in an acid/alkali environment with the pH of 2.5 to 9.0; and the preparation method is simple and convenient and is good in reproducibility.

A nanostructure fabricated on a semiconductor light-emitting device induces strain in the active region. The active device includes at least one quantum heterostructure, in which the strain changes the extent of Quantum Confined Stark Effect, and thus modifies the wavelength of light emission. By mixing strain relaxation and strain induction effects there is a spectral broadening of the light emission, providing polychromatic light emission.

The invention relates to a Ce-doped water-soluble CdTe quantum dot synthetic method, which selects soluble cadmium salt as a cadmium source, tellurium dioxide as a tellurium source and mercaptoacetic acid as a stabilizing agent, and the Ce-doped water-soluble CdTe quantum dot is synthesized in a water phase system. The synthetic method has the advantages of simple and safe process. Compared with a traditional water phase synthesis approach, in the invention, preparation of a NaHTe precursor is not required, no H2Te toxic gas is discharged in a whole synthesis process, and the synthesis method has the characteristics of mild synthesis condition, easy control, simpleness, rapidity and environmental protection. maximum fluorescence emission wavelength of CdTe: Ce quantum dot enables obvious bathochromic shift, the fluorescence emission peak scope of the rare earth Ce-doped water-soluble CdTe quantum dot is 540-570nm, and the particle size is 3-5nm.

The invention belongs to the field of fluorescent probes, and particularly relates to a coumarin derivative-based fluorescent probe and a preparation method thereof. The fluorescent probe promotes deprotection reaction, red shift occurs in ultraviolet absorption and red shift occurs in fluorescence in the presence of Hg <2+> and is remarkably enhanced, and the fluorescent probe has the characteristics of good selectivity, strong anti-interference capability, quick response and the like, is a purposeful, simple, quick and sensitive Hg <2+> specific detection reagent, and can be applied to the field of materials or sensors.

The invention discloses a novel aggregation-state luminescent material with high efficiency and narrow half-peak width, namely an azatriene derivative, a preparation method of the azatriene derivativeand application of the azatriene derivative in an electronic device, and further relates to the electronic device. Particularly, the azatriene derivative shows weak monomer fluorescence emission in adilute solution, shows an obvious red shift luminescence spectrum different from monomer fluorescence characteristics in an aggregation state and has extremely high fluorescence quantum yield and efficient thermal activation delayed fluorescence property. Therefore, the electronic device prepared by taking the azatriene as the fluorescent dye has the advantages of high efficiency and high color purity.