The superfihe green fluorescence powder Tb-doped aluminate is made by microwave heating with its precursor synthesized by co-precipitates of oxalates.The factors of effect on granularity and luminescence intensity are discussed.The excitation spectrum emission spectrum are determinated by fluorescence spectrophotometer.The particle size distribution and x-raydiffractometry (XRD) are made.The results showed that the product crystal was better which prepared by co-precipitates of oxalates at pH=4,crystal growth integral,the color of product was white,the least mean particle size was 0.3 μm,pure single phase and its light intensity reached 95% of that sold in the market.
Five ternary complexes have been synthesized from terbium with aromatic carboxylic acid(p-methylbenzoic acid,p-aminobenzoic acid,sulfosalicylic acid,methoxybenzoic acid,m-chlorobenzoic acid)and acrylonitrile and aslo characterized by means of elemental analysis,thermal analysis,FT-IR spectra and UV spectra.Fluorescence spectra show five ternary complexes have nice luminescent properties.The order of ability in which the aromatic carboxylic acids transfer light energy to terbium ion is as follows:methoxybenzoic acidp-methylbenzoic acidm-chlorobenzoic acidsulfosalicy lic acidp-aminobenzoic acid.At the same time,the ternary terbium complexes containing a reactive ligand acrylonitile will possibly have potential application on the fabrication of bonding-type terbium polymer luminescent materials.
In order to study regularity of fluorescence of complexes about rare earth with different benzoic acid,we have prepared much of BA-compiexes,RC_6H_4COOH(R=o-NH_2,H,p-NH_2,o-OH,m-Cl,o-COOH,m-COOH,p-COOH,p-OH,m-NO_2,3,5-Dinitro,p-Br,o-I,2-OH-5-SO_3H.They can be synthesized complexes with Sm~(3+),Eu~(3+),Tb~(3+),Gd~(3+).Under UV-excitation the complexes with Eu~(3+),Tb~(3+) have higher emitting(intensity) than complexes with Sm~(3+),Gd~(3+).There are some science bases about study a new luminophor.Spectra analyses of the complexes of europium with benzoic acid and its derivatives are discussed.The binary complexes of europium with benzoic acid and its derivatives(benzene carbonic acid,phthalic acid,isophthahc acid,salicylic acid,o-aminobenzoic acid sulfosalicylic acid) have been synthesized.They were characterized by(elemental) analysis,UV-Vis,IR,H NMR,fluorescence spectra and molar conductance.The UV spectra showed that the complexes' ultraviolet absorption were from the ligands(220~350 nm),so that it could transfer energy to rare earth.The measurement results of the emission spectra of the complexes indicated as follows the emission of Eu(BA)_3,Eu(m-Phth)_3·3H_2O and Eu(o-Phth)_3·3H_2O consisted of three peaks at 582,596,and 618 nm which were caused from ~5D_0→~7F_J(J=0,1,2) transition of Eu~(3+) respectively.Among these peaks the emission from ~5D_0→~7F_2 is the shrongest.But the emission of Eu o-aminobenzoic acid consisted(of three) peaks at 399,452,547 nm,and that of sulfosalicylic acid-Eu only one peak at 407 nm,which(were caused) from ligands.Fluorescence spectra show that there aren't red-characteristic emission of Eu in (Eu(o-Amino))_3 and Eu(Ssal)_3.
Rare earth organic complexes combined with inorganic compounds can enhanced thermal stability, but inorganic compounds matrix has great influence on the luminescence characteristic of rare earth organic complexes. The luminescence characteristic of organic and inorganic compound material was improved by PEG doping in the material. Eu(BA)3/SiO2 and Eu(BA)3/PEG400-SiO2 were synthesized by Sol-Gel method. The result of luminescence analysis showed that the excitation spectra and emission spectra of Eu(BA)3 accorded with those of Eu(BA)3/SiO2 and Eu(BA)3/PEG400-SiO2, but the luminescence intensity of Eu(BA)3/SiO2 was improved by PEG400-SiO2 in SiO2 gel. This was because PEG400 as a hard Lewis base, could be combined with rare earth ion and increase the luminescence intensity of Eu(BA)3. It was shown that the amount of PEG400 in Eu(BA)3/SiO2 had influence on luminescence intensity of Eu(BA)3, namely there was better luminescence intensity in Eu(BA)3/SiO2 with increment of the PEG400 addition, but when the amount of PEG400 exceeded 50 wt% of that of SiO2, the luminescence intensity of Eu(BA)3 hardly increased. When the amount of PEG400 exceed 15 wt% of that of SiO2, PEG400 had little influence on the content of water and hydroxy in the matrix, as verified by IR spectrum. The surface characteristic of SiO2 gel was investigated by atomic force microscopy (AFM).
The luminescent properties of glasses doped with Eu3+,Bi3+ and co-doped with Eu3+ and Bi3+ were studied,and their corresponding transitions were studied.The fluorescence spectrum of the glass sample doped with Eu3+ has three major emission bands peaking at 591nm,618nm and 650nm respectively.The strongest emission band peaks at 618nm.The emission bands peaking at 591nm,618nm and 650nm correspond to the 5D0→7F1 transition,5D0→7F2 transition and 5D0→7F3 transition respectively.The luminescent intensity of Eu3+ is stronger when a little Bi3+ is co-doped.The best concentration of Bi3+ and the sensitizing mechanism were also studied.The luminescent intensity of Eu3+ is the strongest when the concentration of Bi3+ is 0.010%.The result shows that the energy transfer between Eu3+ and Bi3+ is the result of the light resorbed.
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