56results about How to "Large absorption cross section" patented technology

The invention belongs to the technical field of fine chemical engineering, and specifically relates to a dicyano-stilbene type two-photon fluorescent solvent chromogenic water soluble probe and a synthesis method and applications thereof. According to the preparation method, dicyano-stilbene (DCS) is taken as a two-photon fluorescent matrix. The volume of the probe is small; the water solubility of the probe is good, and the probe is suitable for detecting the polarity of a solvent. Furthermore, the fluorescent strength and two-photon absorption cross section of the probe changes obviously asthe viscosity is increased; the solvent chromogenic range is very wide, the two-photon absorption cross section is large, the Stokes shift is super large, the detection sensitivity, imaging definition, imaging sensitivity, vertical / horizontal resolution ratio, and detection accuracy are largely improved; and the results of cell microscopic imaging experiments show that the probe has a large chromogenic range and good absorption effect in cells or tissues, the probe can well detect and present the change of cell viscosity, and moreover, the probe does not have any side or toxic effect on cells.The probe has a great application value in fields such as biology, medicine, and the like.

The invention relates to the technical field of scanning probe imaging, and discloses a near-field probe and a probe system based on a single quantum dot as well as a detection device and a method based on the probe system. In a single quantum dot scanning near-field optical microprobe, the single quantum dot is loaded to the point of a dielectric needle through electrostatic force or a chemical adhesive as a probe, and the point of the dielectric needle is a conical fiber or an atomic force microscope probe. The near-field probe system can effectively overcome the defect that a traditional scanning near-field optical probe distorts optical properties of samples and is low in signal-to-noise ratio and low in repeatability; the imaging resolution of the single quantum dot near-field probe can reach the same magnitude of single quantum dot dimension, and is generally superior to 10 nanometer space resolution. The detection method is based on fluorescence intensity imaging and fluorescence lifetime imaging, and can sense the physical quantity information of multiple dimensions such as sample shape, material composition and optical near-field distribution.

The invention belongs to the technical field of fine chemical engineering, particularly relates to a dual-photon fluorescence sodium ion probe and a synthesis method and application thereof. The probeis prepared by using distyrene dicyanide as the parent of the dual-photon fluorescence. The probe has small molecule volume and good selectivity to sodium ions. Oher ions other than sodium ions suchas zinc, potassium, calcium, magnesium, manganese, mercury and the like have no interference to the detection. The sodium ions of micro-molar concentration can be detected. The fluorescence intensityof the probe molecular is reduced after complexation with sodium ions, and the sodium ion content can be detected by double-photon fluorescence. The double-photon fluorescence microscopic imaging experiment shows that the probe has good permeability to cells or tissues such as fibroblast, has no toxic and side effect on the cells, is particularly suitable for detecting the concentration change ofsodium ions in the cell and the detection of the distribution of the mercury ions, and has great application value in the field of biology and medicine.

A kind of Eu-Nd-Yb co-doped strontium aluminate high-efficiency wide-spectrum quantum tailoring luminescent material, the luminescent material is based on SrAl 2 o 4 is the matrix, and the general composition formula of the luminescent material is SrAl 2 o 4 : x Eu 2+ , y Nd 3+ , z Yb 3+ , where, 0.5×10 ‑2 ≤x≤1×10 ‑2 , 0.5×10 ‑2 ≤y≤2×10 ‑2 , 1×10 ‑2 ≤z≤10×10 ‑2 . A kind of Eu-Nd-Yb co-doped SrAl provided by the invention 2 o 4 Quantum tailored luminescent material, Eu in the luminescent material system 2+ Through its sensitization effect, it can effectively broaden the Nd 3+ Absorption cross-section, broadband absorption of sunlight, and then realize efficient, wide-spectrum conversion near-infrared quantum tailoring. Thereby realizing full utilization of sunlight and improving conversion efficiency of crystalline silicon solar cells.