43results about How to "Excellent afterglow performance" patented technology

The invention provides a germanium stannate long-lasting luminescent material and a preparation method thereof, and relates to the technical field of inorganic functional materials. The long afterglow luminescent material of the present invention is based on gallium germanate, and the long afterglow luminescent material has the following chemical formula: Ga 4 GeO 8 :xLn 3+ , wherein, Ln is a trivalent rare earth ion and / or a trivalent transition metal ion; x is a mole percentage. The long afterglow luminescent material of the present invention has a slow afterglow attenuation, and the afterglow emission time can last for several hours, and can form a variety of different colors of luminescence and afterglow colors through different doped ions, and has good application prospects and a wide range of application fields .

The invention relates to a type of rare earth halosilicate red long-afterglow phosphor, and a preparation method thereof. Especially, the invention relates to a type of red long-afterglow phosphor prepared from a base material of rare-earth-modified solonetz halosilicate, and a preparation method thereof. The phosphor is characterized in the structural formula of: (1-[alpha])M,2[alpha] / 3Ln)5(SiO4)2X2:[beta]Eu<3+>,[gamma]Ln<,>, wherein M is at least one of Mg and Ca, Ln is at least one of Y, La, and Gd, X is at least one of F and Cl, Ln<,> is at least one of Dy<3+>, Er<3+>, and Bi<3+>, [alpha]=0.1 to 1, [beta]=0.03 to0.07, and [gamma]=0.001 to 0.05. According to the method, solonetz halosilicate is appropriately modified with rare earth, such that rare-earth-modified solonetz halosilicate, which has a structural formula of (M,Ln)5(SiO4)2X2 is obtained. The rare-earth-modified solonetz halosilicate is adopted as a novel base material, and a rare earth ion Eu<3+> is adopted as a luminous ion. According to the luminous ion Eu<3+>, other rare earth ions or non-rare-earth ions are selected as sensitizers, such that the red long-afterglow phosphor with a main peak wavelength of 611nm, an initial luminance of 1200mcd / m<2>, an afterglow period greater than 12 hours, and a good chemical stability is obtained.

The invention relates to a silicate green long afterglow material. The structural formula of a compound of the silicate green long fluorescent lag material is M1-yZn2-xSi2O7:xMn,yRe,zH3BO3, wherein the ratio of (M)O to ZnO to SiO2 is 1:2:2; x, y and z refer to molar coefficient ratio; Mn is an activator; Re is a coactivator; and H3BO3 is an auxiliary solvent. The invention adopts a technical proposal: adopting silicate as a substrate, single Mn<2+> ions as the activator, and doped ion Re as the coactivator, and fully mixing the raw materials with the auxiliary solvent in proportion; and igniting the mixture for 2 to 4 hours in a high-temperature furnace at the temperature of between 1,000 and 1,300 DEG C in a reducing atmosphere or in the air, cooling the obtained product along the furnace temperature, and taking out the obtained product. The silicate green long afterglow material overcomes the defect of a few varieties of the prior long afterglow material and particularly overcomes the defects of a few luminous colors, weak after glow brightness, poor water resistance and stability, and the like, and is suitable for passive display and energy-saving illumination in the fields of traffic, building, chemical industry, mine, household electrical appliance and the like.

The invention relates to secondarily-excited type silicon-aluminate long-afterglow fluorescent powder and a preparation method thereof, which belongs to the technical field of luminescent materials. The composition of the fluorescent powder is Sr3+x-aM1-xAl2x-b-cSiO5+4x: aEu<2+>, bDy<3+>, cRE<3+> (M=Ca, Sr, Ba, Zn; RE=Nb, Sm, Tm, Er, Ce, Pr and the like, 0(x(5; 0(a(0.8; 0(b(0.5; 0(c(0.5). The designing idea of the fluorescent powder is that two luminescent centers, i. e. the Eu<2+> and the RE<3+>, exist, the emission spectrum of Eu<2+> is superposed with the excitation spectrum of the RE<3+>, and energy transfer exists between the Eu<2+> and the RE<3+>; the Eu<2+> is excited to emit light by external incident light, and the RE<3+> is then excited to emit the light by the emitted light of the Eu<2+> to form secondarily-excited type emitted light; the color of the emitted light is determined by the concentration ratio of the Eu<2+> to the RE<3+>; and the afterglow time of progressively-excited type fluorescent powder is determined by the proportion of the Eu<2+> and the Dy<3+>. The related preparation method comprises the following steps of: weighing all kinds of oxide raw materials according to the measuring ratio of all elements, adding a fluxing agent, placing and calcining under a reducing atmosphere after uniformly mixing through ball milling, and crushing and sieving a product to obtain the required fluorescent powder. The secondarily-excited type fluorescent powder can emit green, red and even white fluorescent light, and the afterglow time can reach 8-12 hours.