吡嗪─2─羧酸─乙醇体系导数荧光法同时测定钐、铕、铽、镝

研究了各种有机溶剂对Ｅｕ３＋、Ｔｂ３＋－吡嗪－２－羧酸荧光体系的增敏效应。结果发现：乙醇不仅能使Ｅｕ３＋,Ｔｂ３＋的特征荧光增敏,而且也使Ｓｍ３＋,Ｄｙ３＋的荧光增敏。在ｐＨ６．０,９９．６％乙醇浓度体系中,Ｅｕ３＋,Ｔｂ３＋的荧光强度分别提高４７和１４倍,实现了同时测定Ｓｍ３＋,Ｅｕ３＋,Ｔｂ３＋,Ｄｙ３＋四种离子。本方法已成功地应用于混合稀土氧化物中四者含量的测定。     

钇离子对铕、铽、镝-萘啶酮酸体系的荧光增敏效应

发现在萘啶酮酸体系荧光法同时测定Eu~(3+),Tb~(3+),Dy~(3+)含量时,由于 Y~(3+)的存在能使这些离子的特征荧光显著增敏,检测限可分别达到0.2,0.02,0.01ng/ml,从而开发了 Y~(3+)-萘啶酮酸增敏体系同时测定 Eu~(3+),Tb~(3+),Dy~(3+)的荧光新体系。应用本法同时测定了混合稀土试样、荧光级氧化钇中的 Eu~(3+),Tb~(3+),Dy~(3+),取得满意的结果。     

锡(Ⅱ)增敏四环素体系导数荧光法测定铕及其增敏机理的探讨

研究了锡（Ⅱ）对铕－四环素体系中铕的荧光增敏作用,对其增敏机理进行了探讨,并进一步研究了该体系荧光法测定铕的最佳测定条件。该体系测定铕的检测限为０．０２μｇ／Ｌ,无锡存在时,铕的检测限为０．０９μｇ／Ｌ。锡（Ⅱ）使铕的荧光检测限降低了４．５倍,用一级导数荧光法,使铕的荧光检测限进一步降低到０．０１μｇ／Ｌ。成功地测定了混合稀土氧化物中铕的含量．     

共沉淀法制备超细长余辉发光材料铝酸锶铕镝的研究

用共沉淀法制备了发蓝光的Sr4Al14O25：Eu^2 ，Dy^3 和发绿光的SrAl2O4：Eu^2 ，Dy^3 超细长余辉发光材料。用SEM，XRD表征了所得磷光材料的形态、粒度和物相组成，用荧光分光光度计测定了磷光材料的发光性能：结果发现，与固相法合成的产物相比，材料的激发光谱和发光光谱均发生了蓝移，余辉亮度有所提高。并且探讨了温度和烧结方式对材料发光性能和材料形态的影响。     

铽-依诺沙星-十二烷基硫酸钠荧光体系的研究及应用

研究了铽-依诺沙星-十二烷基硫酸钠荧光体系的荧光特性。结果表明,十二烷基硫酸钠对铽-依诺沙星荧光体系有较强的增敏作用,铽-依诺沙星-十二烷基硫酸钠形成络合物的组成比为1∶2∶1,并以此体系建立了测定痕量铽的新方法。在最佳实验条件下,体系的荧光强度与铽的浓度在7.0×10-8~2.0×10-6mol/L范围内有良好的线性关系,检测限为2.4×10-9mol/L。该方法已用于合成稀土样品中铽含量的测定。     

稀土离子掺杂对长余辉发光玻璃发光性能的影响

选择制备了系列Eu^2＋，Dy^3＋共掺杂的硼铝酸锶长余辉发光玻璃。利用发光光谱、余辉衰减曲线、热释光谱系统研究了稀土离子掺杂对长余辉玻璃发光性能的影响。研究结果表明，不同掺量组合的Eu^2＋及Dy^3＋对长余辉玻璃发光性能有不同影响，在Eu^2＋及Dy^3＋掺量比为l：l（摩尔比）的情形下，随Eu^2＋离子掺量的增多，发光性能下降；在Eu^2＋及Dy^3＋掺量比为1：2的情形下，随Eu^2＋离子掺量的增多，发光性能增强。在此实验基础上，围绕缺陷形态及其与稀土离子间的能量传递，提出了可能的长余辉机制。     

钒—5-溴-水杨基荧光酮—溴化十六烷基三甲基铵显色反应的研究及其应用

我们合成了显色剂5-溴-水杨基荧光酮,研究了该试剂与钒和溴化十六烷基三甲基铵的显色反应,其摩尔吸光系数为1.27×10~5,是目前三苯甲烷类酸性染料胶束增敏光度法测定钒中灵敏度最高的体系之一。采用适当的分离手段,使该体系能测定某些合金钢中的微量钒。     

Tb（Ⅲ）—TPA体系荧光强度的提高及其在分析中的应用

主要研究了 Tb3＋－ TPA－ TPPO(Phen)体系在 TritonX－ 100与乙醇存在下的荧光性质及 Gd3＋、 Y3＋对 Tb3＋－ TPA－ TPPO荧光强度影响。试验表明：在 pH值为 6的溶液中, Tb3＋－ TPA体系的荧光并不见强;在 TB3＋－ TPA体系中加入 TPPO和 Triton X－ 100,并调节溶液的 pH至 4,则 Tb3＋的荧光强度大幅度提高; Gd3＋、 Y3＋对 Tb3＋－ TPA－ TPPO的荧光强度具有明显增强作用。此法用于痕量 Tb3＋的测定,其检出限可达 2× 10－ 9mol/L。     

6—羟基水杨酸—EDTA—胶束体系荧光法测定铽,镝,钐,钇和镥

探讨了６－羟基水杨酸－ＥＤＴＡ－溴化十产烷基三甲铵体系对Ｔｂ＾３＋，Ｄｙ＾３＋，Ｓｍ＾３＋等金属离了激发态→金属离子基态跃迁型荧光增敏及Ｙ＾３＋，Ｌｕ＾３＋对该体系配体激发态→配体基态跃迁型荧光增敏效应。开发了同时测定Ｔｂ＾３＋，Ｄｙ＾３＋，Ｓｍ＾３＋，Ｙ＾３＋（Ｌｕ＾３＋）的新荧光体系。利用该方法成功地测定了某些稀土氧化物中的钺、镝、钇和镥含量。     

β-环糊精存在下TritonX-100、乙醇、尿素对锌与双硫腙显色反应的影响研究

研究了曲拉通X-100(TritonX-100)、乙醇、尿素对有β-环糊精(β-CD)参与锌-双硫腙显色反应的影响。在各体系的最佳条件下,对其显色反应灵敏度进行了测定和比较。结果发现,它们对该反应协同增敏作用由大到小的顺序为:TritonX-100>尿素>乙醇。TritonX-100与β-CD的协同作用,可将显色体系的灵敏度提高2.3倍。     

Synthesis, Characterization and Fluorescence of Rare earth Nitrate Complexes with Triaza-crown Ether Derivative

Sinceaza crownethershowsspecialcoordinationpropertiestotransitionmetalandheavymetalions[1,2 ] ,therearemanyreportsofthecomplexesinhost guestchemistry ,molecularrecognition[3 ,4] andionophoreinmembranetransportation[5] ,butthereislittlereportontheirrareearthscomplexesandthefluorescenceaboutthecomplexes[6] ,andthefluorescenceintensityoftheircomplexesarenotverystrong .Weinsetbenzoylgroupintothemacrocycle ,expectingthatitsrareearthscomplexeshavebetterfluorescenceproperties .Inthispaperthesynthesis…     

Effect of trivalent rare earth ions doping on the fluorescence properties of electron trapping materials SrS：Eu~（2＋）

Trivalent rare-earth ions (La3+,Pr3+,Nd3+,Sm3+,Gd3+,Tb3+,Dy3+,Ho3+,Er3+,Tm3+,and Yb3+) were investigated as the codoped auxiliary sensitizer for the electron trapping materials SrS:Eu2+ in order to enhance the fluorescence properties.It was found that Sm3+ and Tb3+ had the best photoluminescence stimulated luminescence (PSL) effect among the selected trivalent rare-earth ions.All the SrS:Eu2+ samples doped by different trivalent rare-earth ions could be stimulated by 980 nm laser after being exposed to the conventional sunlight,and they emitted PSL with the peak located at 615 nm.The result also indicated that some co-doped rare earth ions could increase fluorescence intensities of the traditional electron trapping materials SrS:Eu2+.     

以香豆素为配体的三元稀土配合物的合成及发光性能的研究

以香豆素为主配体,邻菲罗啉、三苯基氧化磷、氨替吡啉、水这些中性配体作为第二配体,合成了不同稀土离子(Eu3+、Tb3+、Sm3、Dy3+)的配合物,通过元素分析、红外、紫外、荧光光谱等分析,表征了这些配合物的组成结构和发光性能.结果表明,在所合成的配合物中,香豆素与铕、邻菲罗啉形成的配合物发光强度最强,对其掺入不同比例的钆,发现可改变该配合物的发光强度.     

2,3,5-吡啶三酸与重稀土配合物的合成、表征及光致发光性质

采用水做溶剂,用2,3,5-吡啶三酸做配体和重稀土铽、镝、铒、镱、镥、钇六种稀土元素的氯化物在常温下反应合成了六种重稀土的配合物。通过EDTA络合滴定分析,确定了六种配合物中稀土离子含量;并对配合物进行了熔点测定、红外光谱测试,并测试了铽和镝配合物的光致发光性质,结果表明,铽和镝配合物在紫外光的激发下具有良好的发光性质。     

Studies on synthesis and fluorescent property of rare earth complexes RE（ABMF）2AA and copolymers RE（ABMF）2AA-co-MMA

Four new complexes RE(ABMF)2AA (RE=Sm, Eu, Tb, Dy) were synthesized by the reaction of RECl3·6H2O with acrylic acid (HAA) and 1-(2-furyl)-3-phenyl-1,3-propanedione (ABMF). The copolymerization of the rare earth complexes with methyl methacrylate was studied by using 2,2-azobis-isobutyronitrile as an initiator. The composition and structure of the four complexes were characterized by elemental analysis, UV-vis and FTIR. The glass transition temperature and molecular weight of the copolymers were determined. Photoluminescent measurement showed that ligand ABMF could efficiently transfer the energy to Sm3+ and Eu3+ ions in the complexes and sensitize the luminescence of the rare earth ions, but could not sensitize Tb3+ and Dy3+ ions. As a result, both Sm3+ and Eu3+ complexes emitted the characteristic fluorescence of Sm3+ and Eu3+ ions due to the f-f transitions. The four copolymers could emit strong fluorescence of the rare earth ions.     

SrAl_2O_4:Eu~(2+),Dy~(3+)的发光性质及机理

研究了Eu2＋、Dy3＋共激活的SrAl2O4体系的发光性能和能量传输。结果表明，Dy3＋、Eu2＋共存时，Eu2＋的发光强度远远大于无Dy3＋时的发光强度，证明Dy3＋对Eu2＋的发光有敏化作用。Dy→Eu2＋能量传输的方式为籍助于载流子的能量输运。     

Study on Anticoagulation Factor I from Agkistrodon Acutus Venom by Rare Earth Ion Probes

Ｓｎａｋｅｖｅｎｏｍｓｃｏｎｔａｉｎｃｏｍｐｌｅｘｐｒｏｔｅｉｎｓｗｈｉｃｈｐｏｓｓｅｓｓｖａｒｉｏｕｓｂｉｏｌｏｇｉｃａｌａｃｔｉｖｉｔｉｅｓ ,ｉｎ ｃｌｕｄｉｎｇａｃｌａｓｓｔｈａｔａｆｆｅｃｔｓｃｏａｇｕｌａｔｉｏｎｓｙｓｔｅｍｗｉｔｈｃｏａｇｕｌａｎｔｏｒａｎｔｉｃｏａｇｕｌａｎｔａｃｔｉｖｉｔｉｅｓ .Ａｎａｎｔｉｃｏａｇｕｌａｎｔｆａｃｔｏｒ (ＡＣＦ)ｗａｓｐｒｅｖｉｏｕｓｌｙｉｓｏ ｌａｔｅｄｆｒｏｍｔｈｅｖｅｎｏｍｏｆＡｇｋｉｓｔｒｏｄｏｎａｃｕｔｕｓｆｒｏｍｓｏｕｔｈｅｒｎＡｎｈｕ…     

Hydrothermal preparation and persistence characteristics of nanosized phosphor SrS：Eu^2＋,Dy^3＋

Nanosized long-persistent phosphors SrS: Eu2+, Dy3+ were prepared by the hydrothermal method. The samples were characterized by X-ray powder diffraction, transmission electron microscopy, and charge-coupled device spectrometry. The persistence characteristic was studied using the decay curves. The results showed that the emission intensity decreased sharply with temperature increasing, although the particle size increased. The S2- vacancies caused by oxidization served as shallow traps, and Dy3+ served as deep traps in SrS: Eu2+, Dy3+. The afterglow intensity of SrS: Eu2+, Dy3+ was higher than that of SrS: Eu2+ prepared at the same temperature. However, the minimization span of initial afterglow with temperature for the former sample was larger than that for the latter. Binary-doped phosphor decayed more slowly than the singly doped one. The afterglow of SrS: Eu2+, Dy3+ decayed more quickly with the increase of sintering temperature.     

Blue-green BaAl_2O_4：Eu~（2＋）,Dy~（3＋） phosphors synthesized via combustion synthesis method assisted by microwave irradiation

Blue-green luminescent BaAl2O4:Eu2+,Dy3+ phosphor powders were synthesized via combustion synthesis method assisted by microwave irradiation in air. The phosphors were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and fluorescence spectrophotometer. The XRD results revealed that when the concentration of urea was over 3 times higher than theoretical quantities, a BaAl2O4 single hexagonal phase was obtained. The SEM results revealed that the surface of the BaAl2O4:Eu2+,Dy3+ pow...