铕及其掺杂稀土噻吩乙酸、邻菲哕啉配合物的合成、表征及荧光性能

合成了十种以2-噻吩乙酸（TPAC）、邻菲哕啉（Phen）为配体,单一稀土Eu^3＋配合物、Eu^3＋掺杂La^3＋、Gd^3＋、Y^3＋、Er^3＋以及不同比例的Eu^3＋掺杂La^3＋异核配合物。进行了元素分析、摩尔电导、热谱、红外光谱、核磁共振及荧光性能研究。配合物的组成分别为EuL3L’,Eu0.5L3L＇,Eu0.5La0.5L3L＇,Eu0．5,Gd0.5L3L＇,Eu0.5Er0.5L3L＇和EuxLa1-xL3L＇（其中L=TPAC,L’=Phen）。羧酸的氧原子和邻菲哕啉的氮原子与稀土离子配位,配合物为非电解质。荧光光谱的测试表明荧光惰性离子La^3＋、Gd^3＋、Y^3＋对Eu^3＋的荧光有增强作用,顺序为La^3＋〉Gd^3＋〉Y^3＋;Er^3＋对Eu^3＋的荧光有猝灭作用。不同比例Eu^3＋掺杂口’异核配合物中,当Eu^3＋：La^3＋=0．50：0．50时敏化作用最强,荧光强度值最大。     

均苯三甲酸铕掺杂配合物的合成及其荧光性能

合成了两个系列的均苯三甲酸铕配合物。其一是以均苯三甲酸(H3btc)为配体,Eu3+及掺杂过渡金属Zn2+、Cd2+、Mn2+、N i2+为中心离子的配合物;其二是以均苯三甲酸、邻菲啰啉(Phen)为配体,Eu3+及掺杂Y3+、La3+、Gd3+为中心离子的异核稀土配合物。对配合物进行了元素分析、差热-热重、红外光谱、紫外光谱、荧光寿命及荧光性能等方面的测试分析。配合物的组成分别为:EuL.6H2O(1)、EuLL1.′5.2H2O(2)、Eu0.5Y0.5LL1.′5.3H2O(3)、Eu0.5La0.5LL1.′5.3H2O(4)、Eu0.5Gd0.5LL1.′5.3H2O(5)、EuZnLC l2(C2H5OH)2.2H2O(6)、EuCdLC l2-(C2H5OH)2.5.2H2O(7)、EuMnLC l2(C2H5OH)2.2H2O(8)、EuN iLC l2(C2H5OH)2.2H2O(9)(其中L=btc,L′=Phen)。均苯三甲酸的羧酸氧原子和邻菲啰啉的氮原子与稀土离子配位。差热-热重的测试结果表明,均苯三甲酸-邻菲啰啉异核稀土配合物的分解温度为490℃,铕掺杂过渡金属配合物分解温度为450℃,两类配合物的最终分解产物均为氧化物。荧光光谱的测试结果表明,三元配合物EuLL1.′5.2H2O(2)的荧光强度明显高于二元配合物EuL.2H2O(1);配合物(3)、(4)、(6)、(7)中,Y3+、La3+、Zn2+、Cd2+无未充满的d层或f层电子,对Eu3+的荧光有增强作用;配合物(5)中的Gd3+有4 f7半充满稳定电子层结构,对Eu3+的荧光也有增强作用。在配合物(8)和(9)中,Mn2+和N i2+的未充满d层电子消耗配体吸收的能量,对Eu3+的荧光有猝灭作用。     

（EUxRE1-x）（FTFA）3Phen配合物的合成、表征及荧光性能

在无水乙醇溶液中用氯化稀土与4,4,4-三氟-1-(2-呋喃基)-1,3-丁二酮(FTFA)和邻菲啰啉(Phen)反应,合成了标题配合物;对其进行了元素分析、摩尔电导、红外光谱分析及荧光性能的研究。结果表明其化学组成分别为Eu(FTFA)3Phen、Sm(FTFA)3Phen;(Eu0.5RE0.5)(FTFA)3Phen(RE=Y,La和Gd)及(EuxGd1-x)(FTFA)3Phen(x=0.1,0.3,0.4,0.7,0.9)。配体FTFA通过烯醇式氧负离子与稀土离子双齿螯合配位,Phen的两个氮原子与稀土离子呈环状配位;所有配合物均为非电解质。光谱实验结果表明,铕配合物的荧光发射强度要远大于钐配合物的荧光强度;对于铕系列掺杂配合物来讲,所有激发光谱都为一宽带峰,表明配体能很好的吸收能量;在荧光惰性Gd3 离子的含量0.1相似文献   

铕与苯甲酸、邻菲啰啉系列配合物的合成和光谱分析

合成了铕与苯甲酸(BA)二元配合物及铕与BA、邻菲啰啉(Phen)三元配合物,研究了配合物的红外、紫外吸收光谱及荧光光谱.紫外光谱的研究表明,配合物的紫外吸收主要表现为配体的吸收,配体吸收能量传递给中心离子Eu3+.配合物红外光谱不同于配体的红外光谱,羧基的对称伸缩振动vm (coo-)移至1418cm-1,反对称伸缩振动vaa(COO-)移至1562cm-1,表明稀土与配体之间形成了配位键;测定了配合物及其防伪油墨的荧光性能,铕与苯甲酸、邻菲啰啉形成的三元配合物表现出中心离子Eu3+的特征荧光,616nm荧光发射最强谱蜂对应Eu3+的5D0→7F2跃迁.制备的稀土荧光防伪油墨在可见光下印迹无色,在紫外灯下呈现明显红色荧光.     

在铕-2-噻吩甲酸-邻菲咯啉三元配合物中La3+对Eu3+的发光影响

合成了七种不同掺杂比例的稀土高氯酸盐(铕掺镧)与2-噻吩甲酸-邻菲咯啉的固态配合物,对配合物进行了元素分析、稀土络合滴定、摩尔电导测定,确定了配合物组成为(Eu1-xLax)·L3·phen·1/2H2O(x=0·000～0·200,L为2-噻吩甲酸,phen为邻菲咯啉),并测定了配体及配合物的IR谱及荧光激发和发射光谱。摩尔电导数据表明,此类配合物为非电解质。红外光谱测定表明,配体2-噻吩甲酸羧基氧与稀土离子配位,配体1,10-邻菲咯啉两个氮原子与稀土离子配位。荧光光谱测定表明,Eu3 处于无反演对称中心格位上,Eu3 配合物发射强度增大。配合物中La3 对Eu3 的发光产生敏化增强效应,当La3 掺入量为0·005mol时敏化强度最大,随着La3 浓度的增大,对Eu3 的发光敏化强度降低。     

稀土掺杂铕(Ⅲ)二苯甲酰甲烷邻菲咯啉三元配合物的合成和荧光性质

合成了 3个系列稀土掺杂铕二苯甲酰甲烷 (Hdbm)邻菲咯啉 (phen)三元配合物 Eux RE1 -x(dbm) 3 phen(RE=La,Y,Gd;x=0 .0 0、0 .1 0、0 .30、0 .5 0、0 .70、0 .80、0 .90、1 .0 0 ) ,通过元素分析、摩尔电导率、红外光谱、X射线粉末衍射对配合物进行了表征。对各配合物系列进行荧光光谱研究 ,发现 L a3 、Y3 和 Gd3 对Eu3 离子均有荧光增敏作用 ,其荧光增敏顺序为 L a3 >Y3 >Gd3 。     

铕-苯甲酸-邻菲咯啉掺杂配合物体系的合成与荧光性能研究

合成了Eu_1-xLn_x(BA)₃ Phen(Ln： Gd,La,Y;BA： 苯甲酸;Phen： 1,10-邻菲咯啉)系列固体粉末配合物。红外光谱的研究表明该系列配合物具有相似的结构;荧光光谱表明该类配合物均能发出强的铕离子的特征荧光,并且掺杂元素能增强配合物的发光性能,起到共发荧光作用。     

稀土配合物RE(TPTZ)Cl_3的合成、表征及荧光性能研究

首次以2,4,6-三吡啶基三嗪（TPTZ）与Sm, Eu, Tb和Dy氯化物反应,合成四种单一稀土配合物以及Tb分别1∶1掺Gd, Y, La的三种异核配合物。经元素分析、稀土络合滴定、摩尔电导率、红外光谱、紫外光谱和差热-热重测定表明,配合物的组成分别为RE（TPTZ）Cl3·3H2O（RE=Sm, Eu, Tb, Dy）和Tb0.5Ln0.5（TPTZ）Cl3·3H2O（Ln=Gd, Y, La）;TPTZ作为三齿配体与稀土离子配位,即中心环提供一个N原子,两个吡啶环分别提供一个N原子;配合物中3个水分子与稀土离子配位,1个Cl-在外界,2个在内界,为1∶1型电解质;配合物内外界可能为[RE（TPTZ）（H2O）3Cl2] Cl,稀土离子的配位数为8。配合物的荧光光谱测试表明,四种单一稀土配合物中,Tb配合物发光最强;三种1∶1掺杂异核Tb配合物荧光强度大于纯Tb配合物,表明Y3＋, La3＋和Gd3＋都可以敏化Tb3＋的发光,其中Gd3＋的敏化作用最强,Y3＋次之,La3＋最差。     

稀土萘甲酸邻菲咯啉三元固体配合物的IR和Raman光谱

合成了 5种稀土萘甲酸邻菲咯啉三元配合物 ,其通式为RE(Nap) 3·phen(RE3 =Y3 ,La3 ,Eu3 ,Tb3 ,Dy3 ;Nap- =萘甲酸根 ;phen =邻菲咯啉 )。测定了配合物的IR和Raman光谱 ,对配合物的振动频率作了归属。光谱数据表明 ,稀土离子与萘甲酸的COO- 以双齿方式配位 ,与邻菲咯啉的CN基形成五员螯环。     

对叔丁基杯[8]芳烃稀土配合物的合成、表征及荧光研究

合成了以RE3 (Sm3 ,Eu3 ,Tb3 ,Dy3 )及Tb3 掺杂Ln3 (La3 ,Gd3 ,Y3 )为中心,以对叔丁基杯[8]芳烃(LH8)及DMF,DMSO为配体的两个系列14种同核与掺杂稀土固体配合物,对其进行了元素分析、摩尔电导、热谱、红外光谱、紫外光谱、核磁共振氢谱的测定及荧光性能研究.荧光光谱的测试表明,所有Tb3 及其掺杂配合物具有较强的特征荧光,第二配体DMF对Tb3 及其掺杂配合物的荧光增强作用比DMSO更明显,掺杂荧光惰性离子对Tb3 的荧光增强作用顺序为La3 ＜Gd3 ＜Y3 .     

Guided-Wave Two-Dimensional Acousto-Optic Scanner Using Proton-Exchanged Lithium Niobate Waveguide

Two-dimensional scanning of a 0.6328 mum guided-light beam has been realized using noncolinear acousto-optic (AO) coplanar Bragg diffraction together with colinear AO guided-mode to substrate radiation-mode conversion in a Z-cut Xpropagation LiNbO3 proton-exchanged (PE) waveguide. The two surface acoustic (SAW) waves utilized are at the center frequencies of 500 and 200 MHz, propagating in the Y and X axes, respectively. Two-dimensional scanning of approximately 720 resolvable light beam spots, namely, 18 40 (horizontal vertical) scanning, has been demonstrated using a light beam of 1.0 mm aperture. The total number of resolvable beam spots can be greatly increased from 720 by simply utilizing SAW transducers of larger bandwidth and a light beam of greater aperture. It should also be possible to significantly increase the diffraction efficiency from 3 % by optimizing the parameters of the PE waveguide and the SAWs.     

Femtosecond Transform-Limited Pulse Generation by Compensating for the Linear Chirp of SPM Spectra in Dispersion Shifted Fibers

A simple technique of pulse compression, based on the linear chirp compensation of self-phase modulation (SPM) spectra in dispersion shifted fibers, is demonstrated. The optimization procedure is carried out, for a short span of a single-mode fiber, using a parabolic law, which describes the behavior of the squared output pulse width versus the pump peak power in the case of Gaussian pulses. The experimental results give a minimum pulse duration of 233 fs, which is in good agreement with the model. Shorter and coherent pulses, down to 90 fs, have been obtained by inserting an interference filter at the optical output.     

Effect ofγ-radiation on the spectral luminescence characteristics of impure cadmium tungstate crystals

Results of a study of the effect of γ-radiation on the spectral luminescence properties of cadmium tungstate crystals doped with silver, bismuth, and molybdenum cations are presented. Spectral characteristics of the nondnnnoped crystals are briefly described. Absorption and photo and X-ray luminescence spectra of the crystals taken before and after exposure to γ-radiation (5.5·10⁴ Gy) are compared. It is found that the spectral characteristics of the crystals doped with silver, bismuth, and molybdenum cations do not change markedly after the exposure. The relation between the type of impurity-induced defects, individual characteristics of the impurity cations, and the character of the effect of γ-radiation on the spectral luminescence properties of impure crystals is analyzed (preliminarily). Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 55–60, January–February, 1997.     

Theoretical analysis and simulation of conjugate heights for dual-conjugate AO system in lidar

A multi-conjugate adaptive optics （MCAO） can offer a possibility of widening field of view （FOV） characterized by the isoplanatic angle, and the choose of conjugate height becomes a basic problem for MCAO, which influences the size of iosplanatic angle. Considering the application of lidar, the isoplanatic angle＇s expressions of two deformable mirrors （DMs） MCAO for uplink and downlink are deduced. The effects of conjugate heights for dual-conjugate AO are thoughtfully discussed, and the isoplanatic angles are further analyzed. The results show that the isopanatic angle varies with the conjugate height and reaches the maximum as the conjugate height is at the optimal altitude. Moreover, the optimal conjugate height changes with the propagation distance.     

Quick single-photon detector with many avalanche photo diodes working on the time division

Due to the limit of response speed of the present single-photon detector, the code rate is still too low to come into practical use for the present quantum key distribution (QKD) system.A new idea is put up to design a quick single-photon detector.This quick single-photon detector is composed of a multi-port optic-fiber splitter and many avalanche photo diodes (APDs).Au of the ports with APDs work on the time division and cooperate with a logic discriminating and deciding unit driven by the clock signal.The operation frequency lies on the number N of ports, and can reach N times of the conventional single-photon detector.The single-photon prompt detection can come true for high repetition-rate pulses.The applying of this detector will largely raise the code rate of the QKD, and boost the commercial use.     

Sorting of bending magnets for the SSRF booster

The Shanghai Synchrotron Radiation Facility(SSRF)booster ring,a full energy injector for the storage ring,is deigned to accelerate the electron beam energy from 150MeV to 3.5GeV that demands high extraction efficiency at the extraction energy with low beam loss rate when electrons are ramping.Closed orbit distortion(COD)caused by bending magnet field uniformity errors which affects the machine performance harmfully could be effectively reduced by bending magnet location sorting.Considering the affections of random errors in measurement,both ideal sorting and realistic sorting are studied based on measured bending magnet field uniformity errors and one reasonable combination of bending magnets which can reduce the horizontal COD by a factor of 5is given as the final installation sequence of the booster bending magnets in this paper.     

Improvement of four-wave mixing-based wavelength conversion efficiency in dispersion shifted fiber by 40-GHz clock pumping

40-GHz clock modulated signal as a pump to improve the efficiency of four-wave mixing (FWM)-based wavelength conversion in a 26.5-km dispersion shifted fiber (DSF) is investigated. The experimental results demonstrate that the conjugated FWM component has higher intensity with the clock pumping than that with the continuous-wave (CW) light pumping. The improvement of FWM-based wavelength conversion efficiency is negligible when the pump power is less than Brillouin threshold. But when the pump power is greater than Brillouin threshold, the improvement becomes significant and increases with the increment of pump power. The improvement can increase up to 9 dB if pump power reaches 17 dBm.     

Characterization of PolyA and PolyC mismatches by Raman spectroscopy

A.C mismatches are studied by Raman spectral characterization of PolyA, PolyC, and their equimolar complex in solution of 0.14 mol/L Na ,pH7.0.Experimental results show that A·C mismatches occur to be A/B (mainly A) conformers, and unlike Watson-Crick base pairing, this kind of mismatches is stabilized by only one hydrogen bond involving cytosine N4H2 and adenine N7.The formation of A·C complex makes the base stacking interactions much stronger, and conformation of the backbone more ordered, which leads to obvious Raman hypochromic effect with some shifts in corresponding bands.