Stability and luminescence properties of Tb (III) complexes with adrenaline

Stability and luminescence properties of Tb (III) complexes with adrenaline have been studied. The Tb (III) complexes with adrenaline are quite stable. The fluorescence spectra of the Tb (III) complexes with adrenaline show the characteristic fluorescence bands of Tb (III) ions which are attributed to energy transfer from ligands to Tb (III) ions.

Synthesis and spectroscopic studies of endohedral metallofullerenes Tb@C-2n

Endohedral metallofullerenes Tb@C-2n were synthesized and extracted with high-yield by K-H carbon-are evaporation and an effective pyridine extraction technique at high-temperature high-pressure. Laser-desorption-ionization time-of-flight (LD-TOF) mass spectrometry, X-ray photoelectron spectroscopy (XPS), solid-state fluorescent emission spectroscopy and gas phase derivation reaction with the self-chemical ionization mass spectrometric ion system of vinyl acetate were employed for studying the electronic structures, fluorescent properties and gas phase reactivities of metallofullerenes Tb@C-2n. The experimental results suggest that endohedral metallofullerenes Tb@C-2n would have the approximate structures of Tb3+@C-2n(3-) similar to other metallofullerenes, good fluorescent emission properties and active reactivities in gas phase ion-molecular reactions.

Structure, luminescence and magnetic properties of AgLnW(2)O(8) (Ln = Eu, Gd, Tb and Dy) compounds

Four new compounds AgLnW(2)O(8) (Ln = Eu, Gd, Tb and Dy) are prepared by solid-state reactions. They crystallize with a scheelite-related monoclinic symmetry. Infrared (IR) spectra show complicated absorption transitions in the region of 1000-400 cm(-1) that are similar to those of AgLnMo(2)O(8). Broad excitation and emission bands of the tungstate group are observed in AgGdW2O8 and AgTbW2O8 with a large Stokes shift, 12 573 and 12 387 cm(-1), respectively. Excitation and emission spectra of AgLnW(2)O(8) (Ln = Eu, Gd and Tb) show that energy transfer from the tungstate to EU3+, Gd3+ and Tb3+ occurs and that Eu3+ ions occupy a single crystallographic site with the C-2 Site symmetry. (C) 1997 Elsevier Science Ltd. All rights reserved.

LiMAlF_6(M=Ca,Sr)基质中Ce~3+、Eu~3+、Tb~3+的光谱研究

合成了Ce3+、Eu3+、Tb3+激活的LiMAlF6(M=Ca,Sr)磷光体，研究了它们的光谱特性．观察到稀土离子在LiCaAlF6和LiSrAlF6中的光谱十分相似．这与它们所处的晶场环境相同有关．发现Ce3+在此基质中有较弱的330nm发射，这一Ce3+的发光中心可用于作为材料质量的评价.

真空熔炼(Tb、Dy)Fe金属间化合物的研究

研究了采用真空电弧炉在配制熔炼（Ｔｂ、Ｄｙ）Ｆｅ金属间化合物过程中各种元素成分的变化。结果表明，在真空度约为１．３３Ｐａ下，经一定温度、时间熔炼后，（Ｔｂ、Ｄｙ）Ｆｅ中元素的成分由开始配制的组成—ＴｂＦｅ１．７５和ＤｙＦｅ１．７０，经１２ｍｉｎ熔炼后约为ＴｂＦｅ１．７５８和ＤｙＦｅ１．７３０；经２４ｍｉｎ熔炼后约为ＴｂＦｅ１．７６５和ＤｙＦｅ１．７５６。元素的挥发损失Ｄｙ＞Ｔｂ＞Ｆｅ。这和各元素的熔点、蒸气压等物理化学性质有关。

BaLaB_9O_(16):Re(Re=Eu,Tb)的真空紫外光谱特性的研究

近几十年来,人们对稀土离子的发光已进行了大量的研究,这些研究主要集中在紫外可见波段,对真空紫外区的光谱与能级研究的较少,相关光谱与能级缺乏足够的认识。近年来,随着大屏幕PDP的发展,寻找新型高效真空紫外激发的荧光体(等离子荧光体)已成为目前发光领域的研究热

Ca_2Y_8(SiO_4)_6O_2:Eu~(3+)/Tb~(3+)发光薄膜的制备及其发光性能的研究

本文Si(OC_2H_5)_4和金属的硝酸盐为主要原料,采用溶胶-凝胶法制备了氧磷灰石三元稀土硅酸盐Ca_2Y_8(SiO_4)_6O_2:Eu~(3+)/Tb~(3+)的发光薄膜。利用X-射线衍射(XRD)、红外光谱、电镜等方法对薄膜的组成、结构、颗粒尺寸及厚度进行了研究,通过发光光谱、吸收光谱对薄膜的发光性质进行了分析。

Luminescence properties of sol-gel derived silica gels doped and undoped with RE-complexes (RE=Eu, Tb)

The luminescence properties of silica gels and silica gels doped with two rare earth complexes, Eu(TTA)(3) and Tb(o-CBA)(3) (TTA=thenoyltriffuocetate, o-CBA=o-chlorobenzoic acid) are reported and discussed. Pure silica gels show a blue luminescence, and the maximum excitation and emission wavelengths depend strongly on the solvents used. Both of the studied rare earth complexes exhibit the characteristic emissions of the rare earth ions in silica gels, i.e., Eu3+5D0-->F-7(J)(J=0,1,2,3,4), Tb3+5D4-->F-7(J)(J=3,4,5,6) transitions. Compared with the pure RE-complexes powder, the silica gels doped with RE-complexes show fewer emission lines of the rare earth ions. Furthermore the rare earth ion (Tb3+) presents a longer lifetime (1346 mu s) in silica gel doped with Tb(o-CBA)3 than in pure Tb((o-CBA)(3) powder (744 mu s). The reasons responsible for these results are discussed in the context.

Synthesis and luminescence characteristics of LiMgAlF6:Ln(3+) (Ln = Ce, Eu, Tb)

By solid state reaction, LiMgAlF6 and LiMgAlF6:Ln(3+) are synthetized with the ratio 120/100/110 of LiF/MgF2/AlF3, at 1008 K, in high-purity Ar stream. Their crystal structure which belongs to hexagonal system are determined by X-Ray-Diffraction (XRD). Luminescence characteristics of Ce3+, Eu3+, Tb3+ and sensitization of Ce3+ to Tb3+ in LiMgAlF6 are studied. It is shown that the sensitization of Ce3+ to Tb3+ is efficient and a bright green emission is observed.

Tb(111) and Ca(11) ion equilibria in the presence of glutamic acid and glutamine

Tb(111) and Ca(11) ion equilibria in the Presence of glutamic acid and glutamine were studied by potentiometric titration at 37 degrees C and an ionic strength of 0.15mol/L(NaCl). The stability constants for Tb(111) and Ca(11) complexes in the systems were obtained. The species and their distribution in the systems were discussed.

CaAl_3BO_7:RE(RE=Ce,Gd,Tb)中稀土离子的光谱特性

采用固相反应法合成了ＣａＡｌ３ＢＯ７ＲＥ（ＲＥ＝Ｃｅ，Ｇｄ，Ｔｂ），研究了Ｃｅ３＋，Ｇｄ３＋和Ｔｂ３＋的光谱特性．发现铈离子周围存在较强的晶场，使基态的４ｆ能级劈裂较大，从而导致铈离子的特征发射峰重叠较大；Ｃｅ３＋的５ｄ能级明显低于Ｇｄ３＋的６Ｉ、６Ｐ能级；Ｃｅ３＋和Ｔｂ３＋之间存在有效的能量传递

Luminescent properties of Ba-3(PO4)(2):Eu, Tb phosphors

Luminescence of europium (III), europium(II) and terbium(III) has been observed in Ba-3(PO4)(2):Eu, Tb phosphors which are synthesized in air atmosphere. The valence state of europium is influenced by amount of terbium. It is notable that the relative intensity of the emission spectra peaks corresponding to Eu2+ is increased if the amount of Tb3+ is increased. These phenomena can be explained by an electron transfer mechanism. We predict a new kind of two-rare-earth codoped trichromatic phosphors in Ba-3(PO4)(2) matrix.

The spectral properties of BaB8O13:Eu,Tb phosphors

The luminescence properties of BaB8O13:xEu,yTb phosphors which were synthesized in air atmosphere have been studied. The emissions of europium(III), terbium(III) and europium(II) have been observed in BaB8O13:xEu, yTb phosphors. Electron paramagnetic resonance (EPR) studies were carried out. The intensities of EPR peaks of europium(II) are increased if terbium(III) is increased in BaB8O13:Eu3+,yTb(3+) phosphors. So the valence state of europium is influenced by terbium(III). These phenomena can be explained by an electron transfer mechanism. We found a new kind of method to prepare trichromatic phosphor that two rare earth ions activated in a BaB8O13 matrix.

Electron transfer between Eu and Tb in MMgF(4) systems

Emission of europium(II) and europium(III) have been observed in SrMgF4 : xEu, yTb phosphors which are synthesized in Ar or Ar/H-2 flow. The valence state of Eu is influenced by terbium. It is notable that the intensities of the ESR peaks corresponding to EU(2+) are regularly changed when terbium ion is incorporated. The typical Tb3d XPS spectrum belonging to Tb4+ is also found when Eu is codoped. This phenomena can be explained by electron transfer mechanism Eu3+ + Tb3+-->EU(2+) + Tb4+. And its equilibrium constant is studied by ESR technique.