Improvement of Luminescent Properties of PbWO4 by Doping with Gd3＋ Ions

The luminescent properties of PbW04: Gd3 were studied. The luminescence of Gd3 in PbWO4: Gd3 was quenched. It is possible that the excitation states of Gd3 locate in the conduction band of PbW04 crystal. The luminescent intensity of the green and the blue band of PbW04 emission increases by doping with about 0.005% and 0.01% (molar fraction) Gd3 respectively. Mechanism of this enhancement of PbWO4:Gd3 luminescence is probably due to energy transfer from Gd3 to PbW04 host in the crystal. The PbW04 doped with low concentration of Gd (about 0.005% -0.01% ) is a good scintillating material.     

Photoluminescent and Electroluminescent Properties of Ligand Emitting y^3＋, La^3＋, Gd^3＋ and Lu^3＋ Complexes

The photolumineseent (PL) and eleetroluminescent (EL) properties of a series of ligand emitting rare earth complexes (including y^3 , La^3 , Gd^3 and Lu^3 ) were systematically studied. These complexes have the same anionic ligand, 1-phenyt-3-methyl-4-isobutyryl-5-pyrazoloneate (PMIP), and three neutral ligands, triphenyl phosphine oxide(TPPO), 2, 2‘-dipyridine (Bipy) and phenanthroline (Phen). Measured with 60 nm thin film of these complexes vaporized in vacuum on quartz substrates, a good regularity in the PL properties was observed. For rational comparison, the same structural EL devices based on these complexes, ITO/PVK (40 nm)/the complex (80 nm)/Mg: Ag (200 nm)/Ag (100 nm), were fabricated. Excluding the exeiplex emission happens, the EL luminance usually increases with the increasing of PL efficiency.     

Luminescent Properties of Bi-Rare Earth Complexes with m-methylbenzoic Acid and 1, 10-phenanthroline

Ｔｈｅｒｅｈａｓｂｅｅｎａｇｒｏｗｉｎｇｉｎｔｅｒｅｓｔｉｎｔｈｅｌｕｍｉｎｅｓｃｅｎｃｅｐｒｏｐｅｒｔｉｅｓｏｆｌａｎｔｈａｎｉｄｅｃｏｍｐｌｅｘ ｅｓｗｉｔｈｏｒｇａｎｉｃａｃｉｄｓ ,ｓｕｃｈａｓａｒｏｍａｔｉｃａｃｉｄｓｏｒｐｈｔｈａｌｉｃａｃｉｄｓｂｅｃａｕｓｅｏｆｔｈｅｉｒｐｏｔｅｎｔｉａｌｃｈｅｍｉｃａｌａｎｄｂｉｏｌｏｇｉｃａｌａｐｐｌｉｃａｔｉｏｎｆｏｒｐｒｏｂｅｓａｎｄｌａｂｅｌｓ .Ｅｕ3 + ａｎｄＴｂ3 + ｈａｖｅｍｏｒｅｅｘｃｅｌ ｌｅｎｔｌｕｍｉｎｅｓｃｅｎｃｅｐｒｏｐｅｒｔｉ…     

Influence of Rare Earth Elements on Luminescent Properties of Y2SiO5 ： Tb

Photoluminescent （PL） and cathodoluminescent （CL） properties of rare earths （Sc^3＋ , La^3＋ , Gd^3＋ and Lu^3＋ ） doped （Y0.97Tb0.03）2SiO5 were studied. Rare earth doping clearly influences PL and CL properties of Y2SiO5 ： Tb. For La^3＋ doped system, PL intensity increases nearly 10 % at x = 0.05 whereas for Lu^3＋ doped system, the intensity increases about 20% at x = 0.20. Gd^3 ＋ doping and Sc^3＋ doping reduce the intensity; at x = 0.3, it is reduced about 30% for Gd^3＋ doped system and about 15 % for Sc^3＋ doped system, respectively. Quenching concentration of activator became higher in rare earth doped samples, which may be understood by that the rare earth dopants might dilute the concentration of the activator. Additionally, doping also influences the color saturation of Y2SiO5 ： Tb. Sc^3＋ , La^3＋ , and Gd^3 doping improve the color saturation, whereas Lu^3＋ doping decreases the color saturation. CL measurements show that CL intensity increases for all rare earths doped systems. The energy transfer from Gd^3＋ to Tb^3＋ was discussed.     

Thermal Stability and Luminescence Properties of Eu^3＋ and Tb^3＋ Complexes with a Silica Matrix by Sol-Gel Method

Ternary complexes of europium and terbium with benzoic acid and 1, 10-phenanthroline [RE(BA)3phen] (BA=benzoate phen=1,10-phenanthroline) were introduced into a silica matrix by sol-gel method. The thermal stability and luminescence behavior of the complexes in silica gels were studied in comparison with the corresponding solid-state complexes by thermal decomposition, excitation and emission spectra. The thermal stability of the complexes is enhanced in silica gel matrix and the luminescence remaines unchanged.     

Synthesis, Characterization and Vulcanizing Properties of Rare Earth Complexes with 2-Mercaptobenthiazole

2 ｍｅｒｃａｐｔｏｂｅｎｚｏｔｈｉａｚｏｌｅｗａｓｆｉｒｓｔｒｅｐｏｒｔｅｄｂｙＨｏｆｍａｎｎ[1 ] ｉｎ 1 887.Ｉｔｈａｓｂｅｅｎｕｓｅｄａｓａｎａｃｃｅｌｅｒａｔｏｒｉｎｔｈｅｖｕｌｃａｎｉｚａｔｉｏｎｏｆｒｕｂｂｅｒｆｏｒｍａｎｙｙｅａｒｓ .Ｔｏｄａｙｉｔｉｓｓｔｉｌｌｂｅｉｎｇｕｓｅｄａｓａｍａｉｎａｃｉｄｉｃａｃｃｅｌｅｒａｔｏｒｉｎｒｕｂｂｅｒｉｎｄｕｓｔｒｙ .Ｂｕｔｉｔｈａｓｄｉｓａｄｖａｎｔａｇｅｓｏｆｖｕｌｃａｎｉｚａｔｉｏｎｒｅｖｅｒｓｉｏｎａｎｄｅａｓｙｓｃｏｒｃｈ[2 ] ｗｈｅ…     

Intercalation Assembly, Characterization and Luminescent Properties of Novel Supramolecular Composite Materials, Tb （ Ⅲ ） Complex with Tetrapodal Ligand- Montmorillonite

Two kinds of Tb（ Ⅲ ） complexes with tetrapodal ligand, [TbL（NO3）]^3＋ and [TbL]^3＋ （L： 1,1, 1＇, 1＇-tera （ 2-pyridinecarboxylester ）-di （ trimethylpropane）） were intercalated into the interlayer space of montmorillonite （MT） by ion exchange and coordination reaction of L with the Tb^3＋ ion existing in the interlayer space of Tb-MT respectively. The obtained luminescent supramolecular composite materials, [ TbL （NO3） ]^2＋-MT and [TbL]^3＋-MT were characterized by elemental analysis, XRD, FT-IR, UV-vis and thermal analysis. At the same time, the luminescent properties of the materials were also studied. The results show that the intercalated materials with regular layered structure, good thermal stability and the interlayer spacing （d001） approximates to the size of the complex ions which are located in the interlayer space of MT in the form of a monolayer.     

Synthesis and Photoluminescence Properties of Rare Earth Complexes with 3-Allyl-2, 4-Pentanedione

In order to combine the merits of rare earth organic complexes with excellent material performances of polymers,a polymerizable chelating agent, 3-allyl-2, 4-pentane dione (APD), was synthesized by phase transfer catalysis and its rare earth complexes were prepared. The compounds were characterized by EA, IR and ^1H NMR. Their UV spectra and fluorescence spectra were investigated. The effects of allyl on the luminescence properties of the complexes were studied.The results show that the sensitization of APD is changed by allyl in comparison with that of acetyl acetone (acac), and it becomes an ideal novel ligand of Eu. In addition, intramolecular energy transfer mechanism in the luminescence process in the complexes was also discussed in detail.     

Citrate-Gel Synthesis and Luminescent Properties of α-Zn3 （PO4）2 Doped with Eu^3＋

By using inorganic salts as raw materials and citric acid as complexing agent, α-Zn3(PO4)2 and Eu^3 doped α-Zn3( PO4)2 phosphor powders were prepared by a citrate-gel process. X-ray diffraction (XRD), TG - DTA, FF - IR and luminescence excitation and emission spectra were used to characterize the resulting products. The results of XRD reveal that the powders begin to crystallize at 500℃ and pure α-Zn3(PO4)2 phase is obtained at 800℃. And the results of XRD reveal that Eu^3 exists as EuPO4 in the powder. In the phosphor powders, the Eu^3 shows its characteristic red-orange(592 nm, ^5D0 -^7F1) emission and has no quenching concentration.     

Luminescent Thin Film of Doped Terbium Complex Obtained by Sol-Gel Method

The transparent luminescent thin films of doped terbium complex were obtained by sol-gel method. The result indicates that rare earth carboxylates with poor solubility can be homogeneously doped into sol matrix in situ. The fluorescence spectra show that the thin film material emits the characteristic narrow band emission of Tb3 under the UV excitation.     

Synthesis, Characterization and Fluorescence Studies on Complexes of Terbium with Phenylglyoxylic Acid, 2, 2-Dipyridine, 1, 10-Phenanthroline, Triphenyl Phosphine Oxide

Synthesis, Characterization and Fluorescence Studies on Complexes of Terbium with Phenylglyoxylic Acid, 2,2-Dipyridine, 1,10-Phenanthroline, Triphenyl Phosphine Oxide     

Synthesis, Characterization and Fluorescence Properties of Europium, Terbium Complexes with Biphenyl-4-Carboxylic Acid and o-Phenanthroline

Two series of solid complexes of europium and terbium with biphenyl 4-carboxylic acid and phen were synthesized and characterized in this report. Their elemental analysis, molar conductivities and TG-DTA studies indicate that the complexes have the composition of Eu(phen)L3·1/2H2O, Eu0.5RE0.5(phen)L3·1/2H2O; Tb(phen)L3·H2O and Tb0.5RE0.5(Phen)L3·1/2H2O. (RE=Y3 , La3 and Gd3 ; L=biphenyl 4-carboxylic acid; phen=o-Phenanthroline). The studies of their IR, UV 1H NMR and molar conductivities demonstrate that biphenyl 4-carboylic acid is bounded with RE(Ⅲ) ion. Rare earth ions coordinate with two nitrogen atoms of phen molecules directly in these rare earth complexes. The fluorescence spectra and fluorescence lifetimes of the rare earth complexes show that the fluorescent intensity and lifetime of a series of europium complexes are longer than those of the series of terbium complexes as having the some ligands. There are better fluorescent intensity and lifetime of hetero-nuclear rare earth complexes than homo-nuclear rare earth complexes for europium complexes. The fluorescence emission intensity of Eu3 is raised by inert fluorescent rare earth ions (Y3 , Gd3 and La3 ), but in Tb3 hetero-nuclear rare earth complexes the intensity of Tb3 ions are quenched by the inert fluorescent rare earth ions.     

Synthesis, Characterization and Fluorescence of Terbium(Ⅲ) Complexes with Phenylglyoxylic Acid and 2,2-Dipyridine, 1,10-Phenanthroline, Triphenyl Phosphine Oxide

Three new complexes TbL3dipy(H2O)2, TbL3phen(H2O)2 and TbL2(TPPO)2NO3 were synthesized (L=phenylglyoxylate ion, dipy=2,2-dipyridine, phen=1,10-phenanthroline, TPPO=Triphenyl phosphine oxide).Elemental analysis, conductivity, IR spectra, and 1HNMR spectra studies were performed.IR spectra indicate that the carboxylate ion of phenylglyoxylate is coordinated to the Tb(Ⅲ) ion as an unidentate ligand.In 1HNMR, the signals of different hydrogens in phenylglyoxylate ion shift upfield.The excitation and emission spectra of the three solid complexes were recorded at room temperature, in which the optimum excitation wavelengths are 361.0, 359.0 and 367.0 nm for these three complexes, respectively.Four emission bands due to the 5D4-7Fj(j=6, 5, 4, 3) transitions were observed for TbL3dipy(H2O)2 (489.0, 545.0, 584.0, 620.0 nm) and TbL3phen(H2O)2 (490.0, 544.0, 583.0, 620.0 nm).Under the same conditions, only one emission band due to the 5D4-7F5 transition was observed for the complex TbL2(TPPO)2NO3.The emission intensity of TbL3dipy(H2O)2 is the strongest among the three complexes.     

Synthesis, Characterization and Fluorescence of Terbium（Ⅲ） Complexes with Phenylglyoxylic Acid and 2,2-Dipyridine, 1,10-Phenanthroline, Triphenyl Phosphine Oxide

Three new complexes TbL3dipy （H2O）2, TbL3phen （H2O） 2 and TbL2 （TPPO） 2NO3 were synthesized （L = phenylglyoxylate ion, dipy = 2, 2-dipyridine, phen = 1,10-phenanthmline, TPPO = Triphenyl phosphine oxide）. Elemental analysis, conductivity, IR spectra, and ^1HNMR spectra studies were performed. IR spectra indicate that the carboxylate ion of phenylglyoxylate is coordinated to the Tb（Ⅲ） ion as an unidentate ligand. In ^1HNMR, the signals of different hydrogens in phenylglyoxylate ion shift upfield. The excitation and emission spectra of the three solid complexes were recorded at morn temperature, in which the optimum excitation wavelengths are, 361.0, 359.0 and 367.0 nm for these three complexes, respectively. Four emission bands due to the ^5D4-^7Fj（j = 6, 5, 4, 3） transitions were observed for TbL3dipy（H2O）2（489.0, 545.0, 584.0, 620.0 nm） and TbL3phen（H2O）2（490.0, 544.0, 583.0, 620.0 nm）. Under the same conditions, only one emission band due to the ^5D4-^7F5 transition was observed for the complex TbL2（TPPO）2NO3. The emission intensity of TbL3dipy（H2O）2 is the strongest among the three complexes.     

Luminescence of Terbium Complexes Incorporated into Silica Matrix

Ｔｈｅｓｏｌ ｇｅｌｍｅｔｈｏｄｈａｓｓｈｏｗｎａｓｕｉｔａｂｌｅａｐｐｒｏａｃｈｆｏｒｔｈｅｐｒｅｐａｒａｔｉｏｎｏｆｎｏｖｅｌｌｕｍｉｎｅｓ ｃｅｎｔｍａｔｅｒｉａｌｓ .Ｍａｎｙｒｅｃｅｎｔｗｏｒｋｓｈａｖｅｆｏ ｃｕｓｅｄｏｎｔｈｅｄｅｖｅｌｏｐｍｅｎｔｏｆｓｏｌｉｄ ｓｔａｔｅｔｕｎａｂｌｅｄｙｅｌａｓｅｒｍｅｄｉａｕｓｉｎｇｏｒｇａｎｉｃｄｙｅｄｏｐａｎｔｓ[1 ,2 ]ａｎｄｔｒｉｓ( 2 ,2′ ｂｉｐｙｒｉｄｉｎｅ)ｒｕｔｈｅｎｉｕｍ (Ⅱ )ｃｏｍ ｐｌｅｘ[3 ,4 ] ｗｈｉｃｈｃａｎｈａｖｅｓｏｍｅｐｏ…     

Synthesis and Fluorescence Properties of Europium,Terbium Doped Zn^2＋, Cd^2＋, and Cr^3＋ Complexes

Europium and terbium complexes with strong fluorescence intensity and long fluorescence lifetime were prepared. By replacing half of the europium or terbium ion with M （M = Zn^2＋, Cd^2＋, and Cr^3＋） using the doped method, and then incorporating it with 18-crown-6 ether and terephthalic acid, six heteronuclear samples EuZnLL＇Cl3·3H2O（1）, EuCdLL2＇Cl3·5H2O（2）, EuCrLL＇Cl4· 4H2O（3）, TbZnLL＇Cl3·4H2O（4）, TbCdLL＇2Cl3·4H2O（5）, and TbCrLL＇2Cl4 ·4H2O（6） （L = terephthalic acid, L＇= 18-Crown-6 ether） were obtained. The elemental analysis, molar conductivities, rare earth complexometry, Fourier Transform Infrared Spectroscopy （FT-IR）, ultraviolet （UV）, TGA, fluorescence intensity, and fluorescence lifetime of the samples were measured. The results showed that there were good luminescence properties for heteronuclear complexes （1）, （2）, （4）, and （5）, which were even stronger than those of the homonuclear complexes Eu2LL＇2Cl4·4H2O and Tb2LL＇2Cl4 ·4H2O, but the luminescence properties of EuCrLL＇Cl4·4H2O, TbCrLL＇Cl4·4H2O were very weak. A possible luminescence mechanism was suggested by the organic-inorganic doped mechanism and the law of intramolecular energy transfer.     

Influence of La and Nd Complexes with Citric Acid on Cellulase Activity and Its Mechanism

Influence of La and Nd Complexes with Citric Acid on Cellulase Activity and Its Mechanism