Luminescence Behavior of Rare Earth Ion System

The fluorescence properties of europium and terbium in the calix [4 ] arene sulfonate and Phen-Dbm-complex system were investigated by fluorescence spectra. The maximum characteristic emission wavelength of Eu-Tb-DBMPhen complex system is 611 nm by using 370 nm excitation. The results show the synergistic luminescence effect of Eu3 and Tb3 . The fluorescence intensity can be reduced when calix[ 4 ] arene is added.     

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.     

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.     

Study on Preparation and Properties of PVC Film Modified by Rare Earth

The transparent PVC films were prepared by tape casting. In the process of preparation, rare earth nitrate, as a kind of modifier, was added to the solution of PVC and THF. These PVC films were tested after being crosslinked by ultraviolet light. It is found that the mechanical and physical properties of all the PVC films modified by rare earth nitrate are greatly enhanced.     

Preparation and Characteristics of Rare Earth Loaded Titanium Dioxide

Composite oxide catalysts Eu/TiO2, Ce/TiO2, Y/TiO2 (RE/TiO2) were prepared by impregnation method and characterized by means of UV-Vis spectroscopy, TEM and BET. The results indicate that the size of TiO2 has different elfeet on the modification efficiency. The catalytic activity of micron scale TiO2 increases by 136% and 59% owing to the addition of Y and Ce, respectively, while the catalytic activity of nanoscale TiO2 decreases due to the doping of Y and Ce.     

丙烯酸稀土盐亚微米粒子制备及其荧光性能研究

用反相悬浮聚合方法 ,在超声分散的条件下 ,以氧化还原体系为引发剂、Span体系为乳化剂制备丙烯酸铕以及丙烯酸铕 (镧 )悬浮液。对体系的稳定性及稀土盐的荧光性能等进行了研究 ,讨论了镧离子和铕离子之间的荧光增强作用 ,并利用扫描电镜观察了粒子的形态和粒径     

稀土元素的特殊性质及其应用

本文从稀土元素微观结构角度，揭示了稀土元素的某些特殊性质，并指出这种特性与应用机理有必然的联系。从而启迪稀土使用者，掌握和了解稀土的基本特性，才能自由地驾驭稀土的应用。     

ICP-AES法测定碳酸稀土、氯化稀土中氧化铕量

采用等离子光谱法测定碳酸稀土、氯化稀土中氧化铕含量,系统考察了不同试样浓度、不同基体配分下共存元素对测定元素的影响,并进行了加料回收及精密度实验,结果稳定可靠,与ICP-MS的对照结果令人满意。测定范围0.01%~0.30%。     

Electroluminescent Property of A Novel Co-Doped Rare Earth Complex

A novel co-doped rare earth complex Gd0.5Eu0.5（TTA）3Dipy was synthesized and chosen as the emitter material in the organic electroluminescent device ITO/PVK：Gd0.5 Eu0.5 （TTA）3Dipy/PBD/A1. It was proved that there was Forster energy transfer from Gd^3＋ to Eu^3＋. The electroluminescent mechanism of the device was proposed by measuring and analyzing the emission and the excitation spectra of the emissive layer. Gd^3＋ might play the role of promoting the en- ergy transfer from PVK to Eu^3＋ and inhibiting an intrinsic luminescence of PVK. The device displayed red light with good monochromaticity. The possible energy transfer process of the device was preliminarily discussed.     

Synthesis and Properties of Ternary Europium Complexes with Aromatic Carboxylic Acid and ,Nitrogen-Containing Heterocyclic Ligand

Synthesis and Properties of Ternary Europium Complexes with Aromatic Carboxylic Acid and Nitrogen-Containing Heterocyclic Ligand     

Synthesis, Structure and Photoluminescent Properties of A Novel Oxadiazole-Functionalized Europium（ Ⅲ ） Complex

Scheme1Synthesisrouteof2benzamide5phenyl[1,3,4]oxadiazole(HL1)andgaveabuffersolution.After2h,thesolutionwas pouredintowater;andthewhiteprecipitatewascol lectedanddriedundervacuum.PureproductHL1was obtainedbyre crystallizationfromethanol,m.p.211～213℃.Ana…     

Preparation and Properties of Rare Earth Complexes with 5-Phenyl Pyrazoline Dithioformate

ｏｍｐｏｕｎｄｓｏｆｐｙｒａｚｏｌｉｎｅｈａｖｅｐｒｏｐｅｒｔｉｅｓｏｆｋｉｌｌｉｎｇｂａｃｔｅｒｉａａｎｄｐｒｏｍｏｔｉｎｇｐｌａｎｔｇｒｏｗｔｈ[1] . 5 Ｐｈｅｎｙｌｐｙｒａｚｏｌｉｎｅｄｉｔｈｉｏｆｏｒｍａｔｅｆｏｒｍｓｓｔａｂｌｅｃｏｍｐｌｅｘｅｓｗｉｔｈｍａｎｙｔｒａｎｓｉｔｉｏｎｍｅｔａｌｅｌｅｍｅｎｔｓ[1] .Ｈｏｗｅｖｅｒ ,ｔｈｅｃｏｍｐｌｅｘｅｓｏｆｒａｒｅｅａｒｔｈｍｅｔａｌｈａｖｅｎｏｔｂｅｅｎｒｅｐｏｒｔｅｄ .Ａｓａｎｅｘｔｅｎｓｉｏｎｏｆｏｕｒｐｒｅｖｉｏｕｓｓｔｕｄｉｅｓ[…     

铕、钆-苯甲酸-1,10-菲咯啉的合成及荧光性质

分别合成了稀土（铕、钆）与苯甲酸、1，1-菲咯啉配位的有机稀土羧酸配合物。通过元素分析和红外分析确定了配合物的组成与结构。通过荧光光谱与荧光寿命研究了它们的荧光性质。结果表明，当钆掺入配合物后，能极大地增强铕的特征荧光，当铕与钆的摩尔比为5：5时，荧光强度最强，且此时的荧光寿命最长。经拟合后发现，在（铕、钆）-苯甲酸-1，10-菲咯啉配合物中，钆离子对铕荧光的敏化程度随钆含量的降低以指数形式衰减。     

Doped Organic Electroluminescence from a Novel Rare Earth Complex Tb （3-metho） 3 phen

A novel rare earth complex Tb (3-metho)3phen was synthesized and characterized. The complex was doped into PVK to improve the conductivity and film-forming property of Tb(3-metho) 3phen. A device with a structure of ITO/PVK: Tb(3-metho)3phen/Al was fabricated to study the eleetrolumineseent properties of Tb(3-metho) 3 phen. And the optoluminescent and AFM properties of this device were also studied, which proved the existence of energy transfer from PVK to Tb(3-metho)3phen. As a result, a pure green emission with sharp spectral band at 547.5 nm was observed.     

精矿稀土抛光粉制备工艺研究

采用稀土精矿为原料，研究了制备稀土抛光粉工艺过程，通过ＤＴＡ、ＴＧ、ＸＲＤ、ＳＥＭ、物化分析等检测手段，对试制样品的结构、形貌、物化性能等进行了分析。试制的精矿稀土抛光粉抛光效果优良，制备工艺简短，成本低廉     

纳米稀土铁氧体磁性颗粒的制备研究

采用湿化学方法研究制备纳米稀土铁氧体磁性颗粒，研究纳米稀土铁氧体颗粒制备过程中主要影响因素，如pH和RE^3＋等对纳米稀土铁氧体颗粒粒径及磁性能的影响；同时对纳米Dy铁氧体颗粒的形貌、粒度分布、晶型结构及磁性能进行了分析和研究。研究发现轻稀土对Fe3O4颗粒的磁性有削弱作用，不宜掺杂；重稀土元素掺杂是提高铁氧体磁性颗粒磁性能的有效途径，改善磁性能的强弱顺序为Dy^3＋〉Gd^3＋〉Er^3＋。制备的Dy铁氧体颗粒的平均粒径为9．6nm，比饱和磁化强度98．27A·m^2·kg^-1，具有超顺磁特性。同时讨论了Dy^3＋在Fe3O4的晶体结构中取代Fe离子增强磁性能的可能形式。     

稀土化学热处理与稀土材料表面改性

综述了稀土元素在化学热处理与某些其它表面工程领域中的应用情况,结合笔者的研究工作,介绍了稀土元素在渗碳、渗硼、离子注入、电弧离子镀等方面对工艺过程和改性效果的影响。稀土元素对钢的渗碳和渗硼过程有明显的催化作用,渗速提高20%～30%;对提高渗碳层和渗硼层的品质和磨损特性、强韧性也有良好的效果。在离子注入技术中,稀土元素能使经离子束改性的材料表面硬度和耐磨性大为提高。在电弧离子镀中,对提高膜-基结合力有明显的效果。本文对稀土元素的合金化作用作了分析讨论和概括。     

Preparation of Reactive Bright Blue Rare Earth Dyestuffs and Their Spectra Properties

Reactive bright blue rare earth dyestuffs were prepared by using reactive bright blue and lanthanum oxide,praseodymium oxide, neodymium oxide, samarium oxide, europium oxide, gadolinium oxide, dysprosium oxide, erbium oxide, lutetium oxide, yttrium oxide respectively for dyeing silk cloth.The degree of dyeing of reactive bright blue praseodymium and the degree of fixation of reactive bright blue gadolinium are the biggest, and 22.9% and 7 %are increased with that of reactive bright blue respectively.The spectra of reactive bright blue rare earth and reactive bright blue were studied by UV-VIS.In 200.00 ～ 800.00 nm, reactive bright blue has four absorption peaks, reactive bright blue rare earth has three absorption peaks; in 420.00 ～ 760.00 nm, reactive bright blue has two absorption peaks at 661.50 nm and 625.50 nm, respectively, and λmax is 661.50 nm; reactive bright blue rare earth has one absorption peak at 620.50, 618.00, 622.00, 623.00, 622.50, 619.50, 619.00, 621.00, 624.00, 620.00 nm adding La3 ,Pr3 , Nd3 , Sm3 , Eu3 , Gd3 , Dy3 , Er3 , Lu3 , Y3 respectively.     

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

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