47results about How to "Increase the intensity of upconversion luminescence" patented technology

The invention discloses a method for improving up-conversion luminescence intensity of rare earth ion doped inorganic fluoride. According to the method, pre-synthesized rare earth doped inorganic fluoride is mixed with a solution containing alkali metal cations and fluoride ions, an obtained mixture is subjected to a sufficient reaction at a high temperature, the alkali metal cations and the fluoride ions added to the solution all participate in material modification, luminescence quenching centers in the inorganic fluoride can be reduced, and the up-conversion luminescence intensity and the quantum efficiency of the rare earth ion doped inorganic fluoride can be improved greatly.

The invention discloses an erbium-ytterbium double-doped lanthanum-lutetium oxide laser material, which is characterized in that it includes the structure shown in formula (I): Er 2x ,Yb 2y :(La 0.1 Lu 0.9‑x‑y ) 2 o 3 (I); wherein, 0.01≤x≤0.09, 0.01≤y≤0.07. The invention discloses a preparation method of an erbium-ytterbium double-doped lanthanum-lutetium oxide laser material, comprising the following steps: step 1, weighing Er 2 o 3 , Yb 2 o 3 , La 2 o 3 、Lu 2 o 3 After dissolving in nitric acid, heat at a constant temperature to obtain a mixed solution, add a combustion agent to the mixed solution, and then add a dispersant, adjust the pH to 7 after it is completely dissolved, continue to heat at a constant temperature and gradually dehydrate to obtain a gel; step 2, the gel Grinding and calcining after drying, and then grinding to obtain nano powder after calcination; step 3, adding sintering aid and absolute ethanol to the nano powder, stirring, drying and grinding to obtain pretreated powder; step 4. After pressing the pretreated powder to obtain a green body, then cold isostatic pressing to obtain a green body; step 5, performing constant temperature vacuum sintering on the green body to obtain the laser material.

The invention belongs to the technical field of a nano up-conversion luminescent material, in particular relates to a preparation method for a small-sized NaYF4 nano substrate material with a hexagonal phase by inducement with rare earth nano crystal nucleus. In the method, rare earth ions are doped in the NaYF4 nano substrate material so as to obtain a nano material with a low up-conversion luminescence threshold and high luminescence strength. In the method, the small-sized beta-NaYF4 nano substrate material is generated by inducement with a hydrothermal (solvent) process in the presence of rare earth fluoride nano crystal nucleus, wherein the size of the particle is from 20nm to 200nm, and distribution of the size is even. According to the invention, a preparation method of the small-sized NaYF4 nano substrate material with the hexagonal phase is expanded, and the problem that the NaYF4 nano substrate material, especially water-soluble NaYF4 nano substrate material is difficultly generated at low temperature, is solved. By using the nano up-conversion luminescent material, the demand on biological fluorescent identification probes and disease diagnosis and treatment materials is met, and a foundation is established for the practicable application of the up-conversion luminescent material.