Tb3+ ions were incorporated in P Si matrix material through a sol gel process. Luminescence properties of Tb3+as a function of dopant, firing temperature, composition and structure of matrices were investigated. The g...
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Tb3+ ions were incorporated in P Si matrix material through a sol gel process. Luminescence properties of Tb3+as a function of dopant, firing temperature, composition and structure of matrices were investigated. The gels synthesized by the reaction of P2O5 or H3PO4 with tetraethoxy silane and TbCl3 as dopant were fired in air from the temperature 25～1000℃to form P Si crystalline phase. The crystal structure was determined by powder X ray diffraction. Si5O（PO4）6 were the only crystalline phase and belong to hexagonal crystal system. The emission of 5D4 7F5（～545nm） transition of Tb3+in the P Si system iscomposed of two peaks. The amount of doping Tb3+varied from 0.664%to 1.644%, and no obvious concentration quenching was observed in this doping concentration range. The intensity of Tb3+emission increased with firing temperatureincreasing and becomes stable at 800～1000℃.
A new method to prepare functional polymeric materials was *** materials were manufactured by using supramolecular blocks other than *** supramolecular block,which is an assembly of many same kinds of molecules or dif...
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A new method to prepare functional polymeric materials was *** materials were manufactured by using supramolecular blocks other than *** supramolecular block,which is an assembly of many same kinds of molecules or different kinds of molecules and particles,can show unique properties different from its original molecule or *** an example,a supramolecular luminescent block was prepared by assembly of organic luminescent molecules of (4-methacryloyloxy)trans-stilbenyltrimethylammonium bromide (MSTAB) with semiconductor nanoparticles of *** nanoparticle is as a core and MSTAB as *** block showed a very high increase in photoluminescence intensity of CdSe nanoparticles.A composite material with unique optical properties and good compatibility of two different kinds of phases was obtained by “polymerization" of the blocks.
In this paper, polymer latices P(St-co-MAA) were used to control the crystallization of CaCO 3, and the influence of the lattices on the crystallization habit and morphology was studied by combination of XRD, FTIR and...
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In this paper, polymer latices P(St-co-MAA) were used to control the crystallization of CaCO 3, and the influence of the lattices on the crystallization habit and morphology was studied by combination of XRD, FTIR and SEM. The mechanism of the morphology transformation of CaCO 3 from calcite to vaterite with the increase of polar group content in latex was investigated. The concentrating effect of calcium ions on the latex surface inhibited the transformation from vaterite to calcite.
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