3 results about "Excitation wavelength" patented technology

The invention discloses preparation of fluorogold nano-clusters and application of the fluorogold nano-clusters to tetracycline and copper fluorescent probes. The fluorogold nano-clusters (Au NCs) aresynthesized with a one-step method from casein separated from milk and carbon quantum dots as a stabilizer and a reducer for synthesis of the Au NCs. The Au NCs perform emission three times at 433 nm, 702 nm and 1052 nm under the excitation wavelength of 350 nm, tetracycline has a linear quenching effect at 702 nm, Cu<2+> is added to an Au NCs system after quenching, fluorescence recovers, and fluorescence intensity at 1052 nm is almost not affected in the overall process; tetracycline is added to the Au NCs, observation is carried out under a UV (ultraviolet) lamp with wavelength of 365 nm,red fluorescence of the Au NCs changes into yellow fluorescence, and after addition of Cu<2+>, the yellow fluorescence disappears gradually and the red fluorescence recovers gradually. Therefore, a near-infrared ratio fluorescence switch for tetracycline and Cu<2+> and UV visual dual-signal detection are established. The method has the advantages of adopting a fluorescence spectrum in a near infrared region and being small in interference, high in specificity and detection sensitivity, convenient to operate and capable of detecting tetracycline and Cu<2+> simultaneously.

The invention relates to rare earth ion liquid as well as a preparation method and application thereof in o detection of ferric ions. According to the invention, the rare earth ion liquid [C4mim] [Dy(NO3)4] is used as a fluorescence probe, a rare earth ion liquid aqueous solution with fixed concentration is prepared to be used as standard detection liquid, and whether water contains ferric ions or not can be judged by observing whether the ionic liquid fluorescence light cancels or not under 325nm excitation wavelength. By adopting the rare earth ion liquid, the ferric ions can be exclusively recognized, interference of other heavy metal ions is avoided, the detection method is simple and fast, a detection reagent is short in synthesis period and high in yield, and when being applied to actual production, the ion liquid is an environment-friendly solvent and has a wide application prospect.

The invention provides efficient white light emission glass containing silver nanoparticles, and a preparation method thereof. The efficient white light emission glass is composed of the following components by mole: (60-x)% of SiO2, 20% of Al2O3, 20% of CaO, x% of Li2O, 0.2% of Eu2O3 and y% ofAg2O, wherein 0 =< x <= 10; and 0.1 =< y <= 4. The efficient white light emission glass containing the silver nanoparticles is obtained by the steps of preparing materials according to the above molar ratios, grinding the prepared components thoroughly to uniformly mixed; melting the mixture under an air atmosphere; and finally subjecting the melted mixture to conventional molding and annealing. The efficient white light emission glass has the characteristics of simple glass components, high fluorescent intensity, wide excitation wavelengths, and easily adjustable white light color temperature. The white light glass has the characteristics that the melting process is simple and carried out under the air atmosphere and has strong glass-forming force, low cost and no pollution to environment. The color difference caused by different luminescent lifetimes of trichromatic phosphors is solved; and at the same time, the problems of deliquesce and complex coating of conventional phosphors are prevented. The efficient white light emission glass containing the silver nanoparticles can be used for manufacturing novel white light LED illumination and display devices excited by near ultraviolet chips.