9 results about "Dual emission" patented technology

The invention provides a single-component boron-nitrogen-doped dual-emission carbon quantum dot and a preparation method and application thereof.The carbon quantum dot is synthesized through a triaminophenylboronic acid one-step hydrothermal method, 370 nm and 420 nm dual-emission peaks are generated at the same time under 320 nm excitation, the average particle size ranges from 2.0 nm to 2.3 nm, the boron doping amount ranges from 8% to 12%, and the nitrogen doping amount ranges from 2.5% to 4.0%. The carbon quantum dot as a ratiometric fluorescent probe can simultaneously detect Fe < 3 + > and Hg < 2 + >, has detection limits of 0.069 [mu] M and 0.1524 [mu] M respectively, has linear response in a pH range of 8.0-13.0, and is successfully used for cell imaging. The problems that a traditional multi-component probe is complex in preparation and poor in stability are solved, multifunctional integrated detection is achieved, and the probe has wide application prospects in the fields of environmental monitoring and biomedicine.

The invention discloses a side chain substituted triphenylmethyl free radical with light-operated dual-emission characteristics as well as a preparation method and application thereof, and relates to the technical field of organic light-emitting materials. The meta-position of a triphenylmethyl free radical is used as a modification part, aromatic substituents with different characteristics are introduced through a Suzuki reaction to regulate and control the high-energy-state electron energy level, so that the material has light-operated dual-emission performance, the variety of light-emitting free radicals can be expanded, the application of the material in more fields is further realized, and the application range of the material is widened. The compounds can be used in the fields of optical sensing, electroluminescent devices, biological imaging and the like. The problem that in the prior art, triphenylmethyl free radicals which are stable in side chain substitution, light-emitting and have light-operated dual-emission characteristics are lacked is solved.

The invention discloses preparation and property research of stable cuprous-doped carbon quantum dots, the carbon dots are synthesized from amino acid compounds and copper salt compounds by a traditional top-to-bottom water and hot method, and the preparation method comprises the following steps: mixing amino acid and copper salt, dissolving in ultrapure water, and stirring to obtain a mixed solution; and after ultrasonic dissolution, transferring the mixture into a polytetrafluoroethylene inner container, putting the inner container into a stainless steel high-pressure kettle, putting the stainless steel high-pressure kettle into a muffle furnace, and heating to obtain the carbon dots. After the reaction is completed, cooling to room temperature, centrifuging and collecting supernate, and finally freeze-drying to obtain the carbon dots. The target carbon dots Cu-CDs are confirmed through the characteristic fluorescence characteristics of a small animal living body imaging instrument and the valence state of copper in the carbon dots represented by XPS. The prepared target carbon dots are good in biocompatibility and low in cytotoxicity, meanwhile, the target carbon dots have visible light and near-infrared light dual-emission fluorescence, the catalytic process of Fenton reaction is more efficient due to the unique Cu < + > intermediate state structure, targeted and efficient treatment is achieved in specific microenvironments of diseased regions such as tumors, and integration of diagnosis and treatment of organism diseases is expected to be achieved.

The invention discloses an ionic coumarin-based rare earth complex as well as a preparation method and application thereof, and belongs to the field of organic photoelectric functional materials. 3-acetyl-4-hydroxycoumarin and a methoxy substituted derivative 4-hydroxy-6-methoxy-3-acetocoumarin thereof are used as organic antenna chromophores; triethylamine is used as a counter cation to prepare a series of ionic high-luminescence rare earth complexes; wherein the Tb < 3 + > complex 2 shows the highest luminous efficiency value of the coumarin-based rare earth complex due to the proper triplet excited state energy level of a Coum ligand and the low symmetric D2d triangular dodecahedron spatial configuration of the Coum ligand; the edge of an excitation band of the OMe series complex 6-9 is widened to a visible region, and the obviously widened excitation window is combined with the ionic charge characteristics of the OMe series complex 6-9, so that the complex becomes a potential candidate for visible light activation application which is safer and deeper in penetration; the Dy < 3 + > complex 9 shows double emission characteristics of OMe-Coum blue fluorescence and Dy < 3 + > characteristic yellow phosphorescence, and high-quality single-component composite white light emission is realized by fusing the OMe-Coum blue fluorescence and the Dy < 3 + > characteristic yellow phosphorescence.

This invention relates to a ratiometric sensor based on UiO-66-NH2@TT-COF composite material and its preparation method. The ratiometric sensor based on UiO-66-NH2@TpTt-COF composite material is synthesized by using an interface growth method to coat a TpTt-COF shell onto the surface of UiO-66-NH2, resulting in a UiO-66-NH2@TpTt-COF composite material with dual emission properties. A ratiometric fluorescence sensor can then be constructed using this UiO-66-NH2@TpTt-COF composite material. This invention uses an interface growth method to coat a TpTt-COF shell onto the surface of UiO-66-NH2, thereby synthesizing a UiO-66-NH2@TpTt-COF composite material with dual emission properties, thus constructing a novel ratiometric fluorescence sensor. When used to detect tetracycline, it achieves high selectivity and high sensitivity, thus providing a novel synchronous response sensor for antibiotic detection and offering a new possibility for the use of core-shell MOF@COF composite materials in the field of food safety.

The application discloses a preparation method of host-guest doped methyl phthalate derivative and application of the host-guest doped methyl phthalate derivative in encryption and Fe(III) detection. The preparation method comprises the following steps: adding benzaldehyde, malononitrile, triethylamine, dimethyl butyne diacid and anhydrous dichloromethane into a reaction bottle, reacting at room temperature for 2 hours, and then obtaining the methyl phthalate derivative through separation and purification. The purified methyl phthalate derivative is doped with polymethyl methacrylate or polyvinyl alcohol at a weight ratio of 1:100, and then the doped material is uniformly mixed through dissolution, and the solvent is removed through heating at different temperatures to obtain a host-guest doped material with a double emission characteristic of thermal activation delayed fluorescence and room temperature phosphorescence. By using different phosphorescence emission wavelengths and afterglow life of the doped system, a high-level anti-counterfeiting pattern is constructed, and visual detection of Fe 3+ is realized.

This invention relates to the field of organic small molecule material detection technology, specifically to a molecular probe with dual excitation-dual emission-dual-mode dynamic monitoring function, its preparation method, and its application. The molecular probe is reacted with ClO in a DMF-water solution. ‑ Increased concentration exhibits a dual-excitation, dual-emission fluorescence response and a dual-mode dynamic monitoring response based on a direct red-blue colorimetric change in the solution; with increasing alkalinity, its fluorescence emission exhibits an "on-off" dynamic response of first red shift and then blue shift, along with a dual-detection signal of gradually darkening red light in the solution; it also shows a similar response to low-concentration ClO₂. ‑ Forming a binary system for SCN ‑ SiO3 2‑ It exhibits red fluorescence emission "off-on" and reacts with high concentrations of ClO. ‑ The resulting binary system exhibits a dual-signal response to acidic environments, displaying both on-off blue fluorescence emission and a readily apparent colorimetric change, and provides rapid and sensitive detection. The molecular probe provided by this invention boasts advantages such as mild synthesis conditions and simple preparation, creating favorable conditions for its widespread application.

The application discloses a kind of double-emission carbon dot hydrogel film and its preparation method and application, it is related to analysis detection and functional material technical field.The double-emission carbon dot hydrogel film with polyvinyl alcohol hydrogel as carrier, wherein uniformly dispersed with the double-emission carbon dot (O-CDs) synthesized with L-glutamic acid and o-phenylenediamine as precursor.O-CDs has dual emission peak of 400 nm and 530 nm under 375 nm excitation.Double-emission carbon dot hydrogel film is applied in Cu 2+ And Ag + Portable visual detection, which is a dual-mode measurement based on RGB, including fluorescence colorimetric assay in solution and smartphone-assisted visual detection film.The dual-mode strategy does not require sophisticated instruments, and can achieve rapid, reliable and simultaneous detection of Cu 2+ And Ag + Within 10 min, breaking through the limitations of traditional single-mode detection, and providing a robust platform for on-site metal ion monitoring.

This invention discloses a carbon quantum dot (CQD) and copper-silver alloy nanocluster hybrid dual-emission ratiometric fluorescent probe, its preparation method, and its application. The invention involves mechanically mixing short-wavelength emission CQDs with long-wavelength emission CuAgNCs at room temperature to form a CQDs-CuAgNCs fluorescent probe with dual emission characteristics. The ratio of the two emission peaks is used to construct a ratiometric fluorescent probe for the quantitative detection of L-cysteine. The invented CQDs-CuAgNCs dual-emission ratiometric fluorescent probe exhibits high selectivity and sensitivity.