Photolysis of light-transforming polymer materials on the basis of europium(III) nitrate with 1,10-phenanthroline and anthranilic acid

Light-transforming polymer materials on the basis of europium(III) nitrate with 1,10-phenanthroline and anthranilic acid, having an intense luminescence in the 400–650 nm spectral range, were obtained. It is shown that the photostability of the polymer materials on the basis of the obtained compositions is higher than of polymer materials activated by europium(III) compounds. Luminescent and photochemical characteristics of the obtained polymer compositions are determined by the molar ratio of the dopants: the maximum luminescence intensity and photostability is characteristic for the polymeric material containing europium(III) nitrate with 1,10-phenanthroline and anthranilic acid at a molar ratio of 1: 2.     

Band structure and birefringence of LiRbSO<Subscript>4</Subscript> crystals

Composite light-transformig polymer materials were prepared from europium(III) and ittrium(III) cinnamates and high-pressure polyethylene. It was shown that combined use of these rare earth complexes leads to intense luminescence in the 400–700 nm region. Luminescent and photochemical characteristics of these polymer composites were determined by the dopant molar ratio: samples containing polymer europium cinnamate and ittrium cinnamate at a molar ratio of 1: 0.5 had the maximum luminescence intensity and photostability.     

Spectroscopic properties of polycrystals of supramolecular europium complexes with bathophenanthroline

Nanostructured supramolecular complex of europium(III) with bathophenanthroline (bphen), with detonation synthesis nanodiamonds (NDs) used as a structure-forming element, has been synthesized for the first time. The characteristics of the Eu(bphen)₂(NO₃)₃ complex and the supramolecular complex with NDs, ND–Eu(bphen)₂(NO₃)₂, are studied and compared using scanning electron microscopy (SEM), luminescence spectroscopy, IR spectroscopy, and electron-spin resonance (ESR) spectroscopy. The luminescence quantum yields of the complexes are estimated by the relative method using a β-diketonate complex of europium (III) with tris(thenoyltrifluoroacetone) and 1,10-phenanthroline (Eu(TTA)₃phen) as a reference. It is found that the ND–Eu(bphen)₂(NO₃)₂ supramolecular complex has a higher photoresistance than the complex without NDs and no worse thermal stability (up to a temperature of +150°C).     

Luminescent Properties of Europium(III) Compounds with Quinaldic Acid and Neutral Phosphorus-Containing Ligands with a Dimeric Structure

New luminescent mixed-ligand complexes of europium(III) with quinaldic acid and neutral phosphorus-containing ligands with a dimeric structure are synthesized. The structure and the thermal, spectral, and luminescent properties of mixed-ligand europium(III) complexes are studied. It is shown that the quinaldinate ion is coordinated to a europium(III) ion in a bidentate fashion. It is found that the excitation energy transfer to europium (III) ion occurs from levels of quinaldic acid and neutral phosphorus-containing ligands.     

Luminescence properties of compounds of europium(III) with quinaldic acid and phosphor-containing neutral ligands

Luminescent complex mixed-ligand compounds of europium(III) with quinaldic acid and phosphor- containing neutral ligands have been obtained. Their composition and structure have been determined. The thermal and spectral-luminescent properties of the obtained complex mixed-ligand compounds of europium( III) have been studied. It is shown that, during thermolysis, a water molecule and neutral ligand are detached in two stages with endothermic effects. It is established that quinaldinate ion is coordinated to europium(III) ion in a bidentate fashion. The Stark structure of the ⁵D₀–⁷F_j (j = 0, 1, 2) transitions in low-temperature luminescence spectra of complex compounds of europium(III) has been analyzed.     

Assemblies, characterization, and luminescent enhancement of organized molecular films based on rare earth complexes

Langmuir-Blodgett (LB) films of different molar percentages of Eu(TTA)₃Phen (TTA=2-thenoyltrifluoroacetone; Phen=1,10-phenanthroline) with Gd(TTA)₃Phen coexisting with arachidic acid (AA) (complexes:AA=1:l, in molar ratio) were fabricated and the luminescence enhancement of Eu(III) in the films was studied in this investigation. The monolayers and LB films were characterized by π-A isotherms, fluorescence microscopy, UV-vis spectroscopy and low-angle X-ray diffraction. High-quality LB films and strongly luminescent films were obtained. It was learned from the present study that an efficient intermolecular energy transfer occurred from Gd(TTA)₃Phen to Eu(TTA)₃Phen in the films, which resulted in the luminescence enhancement effect. According to the proposed model of the “active enhancement circle” the distance of energy transfer from Gd-, Tb-, La-, and Y-complex to Eu-complex were calculated to be 1.2, 1.2, 0.7 and 1.0 nm, respectively.     

Luminescent europium(III) and terbium(III) nicotinate complexes covalently linked to a 1,10-phenanthroline functionalised sol-gel glass

Sol-gel glasses with covalently linked lanthanide complexes are luminescent materials which can be processed at ambient temperatures, which have a good solubility and uniform distribution of the complexes in the host matrix. In this study, a luminescent terbium(III) complex was covalently coupled to an organic-inorganic hybrid material prepared by the sol-gel process. This was realised by use of nicotinate groups as the ligands for the terbium(III) ion. The [Tb(C₅H₄NCO₂)₃(phen)(H₂O)₂] complex was immobilised on the sol-gel glass matrix and showed a green photoluminescence upon irradiation with ultraviolet light. The nicotinate groups act as an antenna to absorb the incident light and channel the excitation energy to the terbium(III) ion. The sol-gel glass was also prepared for the corresponding europium(III) complex. In this case, excitation of the europium(III) ion was possible via both the nicotinate ligands and the 1,10-phenanthroline ligands. High-resolution luminescence and excitation spectra were recorded and the radiative lifetimes were measured.     

铕(Ⅲ)配合物的合成及发光性能研究

分别以1,10-邻菲咯啉、三苯基氧磷、2,2’-联吡啶为第二配体,以苯甲酰丙酮为第一配体,合成了3种铕(Ⅲ)配合物。通过红外光谱、紫外-可见光吸收光谱和荧光光谱对其性能进行了表征。初步从理论上探讨了不同的第二配体对铕(Ⅲ)配合物光致发光性能的影响,并建立了分子内能量传递模型。结果表明：配体和配合物对紫外光都有强烈吸收,所有配合物在紫外光激发下均能发射Eu3+的特征荧光;第二配体与Eu3+间的能级差以及第一配体与第二配体间的能级差都会影响铕(Ⅲ)配合物的荧光量子效率。     

基于邻菲咯啉的反应型三元铕配合物的合成与荧光性质

以二苯甲酰甲烷(HDBM)为第一配体,5-丙烯酰胺基-1,10-菲咯啉(Aphen)为活性第二配体,制备了新的反应型三元铕配合物Eu(DBM)₃Aphen。通过元素分析、红外光谱和热分析对配合物进行了组成确定,采用紫外光谱、荧光光谱、荧光寿命和荧光量子产量研究了配合物的光物理性能。结果表明,在紫外光激发下,配合物Eu(DBM)₃Aphen能发射Eu3+的特征荧光,其荧光发射强度、单色性、荧光寿命和荧光量子产率等均显著高于文献报道的丙烯酸配合物Eu(DBM)₂AA的相应数值,表明配合物Eu(DBM)₃Aphen不仅可作为潜在的红色发光材料,还可作为反应型的配合物,为制备具有优异发光性能的稀土聚合物提供了一条新的途径。     

铕与对硝基苯乙酸及邻菲罗啉三元配合物的合成、特性及荧光性质

本文合成了铕与对硝基苯乙酸（HL）及邻菲罗啉的三元固体配合物,通过元素分析确定其配合物的组成为EuL3phen。用红外光谱、热分析、摩尔电导、紫外光谱对该配合物进行了表征。研究了Eu^3 配合物的荧光性质。     

Tb-N-苯基邻氨基苯甲酸-1,10-菲咯啉二元、三元配合物的合成、表征及荧光性能

合成了稀土Tb-N-苯基邻氨基苯甲酸-1,10-菲咯啉二元、三元配合物。通过元素分析确定二元配合物的组成为TbL₃·4H₂O,三元配合物的组成为TbL₃phen·2H₂O(L: N-苯基邻氨基苯甲酸根,phen: 1,10-菲咯啉),讨论了两种配合物的谱学性质。通过荧光光谱测试发现,形成的TbL₃·4H₂O二元配合物的荧光强度明显降低,1,10-菲咯啉作为第二配体引入后,使Tb3+的发光强度继续降低,这说明了Tb3+的发光强度与配体的结构有关,通过结构、能量传递和能量匹配对此做了进一步的解释。     

Luminescence properties of europium(III) compounds with quinaldic acid and nitrogen-containing ligands

Luminescent mixed-ligand Eu(III) complexes with quinaldic acid and nitrogen-containing dimeric ligands are synthesized. The thermal and spectral-luminescent properties of the obtained mixedligand Eu(III) complexes are studied. It is shown that a water molecule and a neutral ligand are detached during thermolysis in two stages with endothermic effects. It is found that the quinaldinate ion is coordinated to a europium(III) ion in a bidentate fashion. The Stark structure of the 5D₀–7F _j (j = 0, 1, 2) transitions in the low-temperature luminescence spectra of europium(III) complexes is analyzed.     

蓝光激发的基于1-(7-(叔丁基)-9-乙基-9H-咔唑-2-位)-4,4,4-三氟代-1,3-二氧代丁烷为配体的红色发光铕(III)配合物

合成了一个新的铕(III)配合物EuL3(phen)(L为去质子的1-(7-(叔丁基)-9-乙基-9H-咔唑-2-位)-4,4,4-三氟代-1,3-二氧代丁烷,phen为邻菲啰啉). 用元素分析、红外、核磁、紫外可见吸收光谱、热重分析、光致发光对该铕配合物进行了表征. 热重分析表明配合物的稳定性达到325 oC. 光致发光研究表明：该配合物发出强烈红光,其激发光谱延伸到可见光区域. 该配合物和460 nm发射的InGaN芯片组合得到了一个具有红光的发射的发光二极管. 该铕(III)配合物是蓝光激发的红色发     

以Eu-苯甲酸-1,10-菲咯啉为掺杂剂的SiO2,SiO2-B2O3和SiO2-B2O3-Na2O体系材料的结构及Eu3+的发光性质

用溶胶-凝胶法制备以Eu-苯甲酸-1,10-菲咯啉为掺杂剂的SiO2,SiO2-B2O3和SiO2-B2O3-Na2O为基质的发光材料.材料经1000℃退火处理后,结构十分稳定.通过激发光谱和发射光谱、红外光谱、TEM、XRD研究了基质结构对Eu3 发光性能的影响.结果显示:在589和614 nm处显示Eu3 的特征发射带,对应于Eu3 的5D0→7Fj(j=1,2)跃迁;与直接掺入EuCl3的玻璃材料相比,以Eu-苯甲酸-1,10-菲咯啉为掺杂剂的玻璃材料,虽然Eu的掺杂量较小,但Eu的发光强度较大.与以SiO2为基质的玻璃材料相比,以SiO2-B2O3为基质的玻璃材料Eu3 的发光减弱,其红外光谱显示形成Si-O-B键,说明该结构对Eu3 的发光有猝灭作用,以SiO2-B2O3-Na2O为基质的玻璃材料Eu3 的发光明显增强,其红外光谱显示不存在SiOB键的振动吸收,可能是Na取代B的位置,形成Si-O-Na键,此结构对Eu3 的发光有一定的增强作用.     

键合型PU/Eu(Cit)Phen荧光纳米纤维制备与表征

合成了含-OH(羟基)的Eu(Cit)Phen(铕-柠檬酸-邻菲咯啉)三元配合物与端-NCO(异氰酸酯)基PU(聚氨酯)预聚物,通过一OH与一NCO间加成反应及l,3.丙二醇扩链反应制备键合型PU/Complex稀土高分子材料,将其溶液经静电纺丝制得具有荧光性能的纳米纤维.采用FT-IR、SEM、XRD、DSC和PL对...     

4,4,4-三氟-1-(4'-间三联苯基)-1,3-丁二酮邻菲咯啉铕(Ⅲ)配合物的合成与发光

合成了新的配合物EuL3phen,[HL=4,4,4-三氟-1-(4’-间三联苯基)-1,3-丁二酮,phen=邻菲咯啉]。采用元素分析,红外光谱,质谱对该配合物的结构进行了表征。该化合物在半导体InGaN芯片发出的近紫外光激发下,发出铕(Ⅲ)离子5D0—7FJ(J=0~4)跃迁特征红光,最大发射峰位于613 nm,发光量子效率为13%。配合物寿命为470μs,寿命曲线很好地和单指数衰减拟合曲线相吻合。配合物热稳定性达到220℃,满足制备LED器件的要求。将配合物EuL3phen和半导体395 nm发射InGaN芯片组合,成功地制备了红色发光二极管。发光二极管的色坐标、发光效率、配合物和硅胶质量比相关,在配合物和硅胶质量比为1∶25时,器件色坐标为x=0.64,y=0.35,光效为0.89 lm.W-1。该配合物是充当制作白光LED用的潜在的红色发光组分。     

Electrogenerated chemiluminescence of chosen terbium complexes deposited into Al2O3 layer at the aluminium cathode

Cathodic electrogenerated luminescence of terbium(III)-(acetylacetonate)₃-1,10-phenanthroline, terbium(III)-(salicylate)₃ and terbium(III)-(salicylate)₃-1,10-phenanthroline complexes were studied. In this experiment terbium complexes were coated upon aluminium porous oxide layer by physical adsorption from methanolic or acetonate solution. The hexagonally ordered porous aluminium oxide has been prepared in a two-step anodization process in sulphuric acid solution. The primary step of cathodic ECL in this method is tunnel emission of hot electrons through barrier oxide layer. Electrochemiluminescence was achieved by recombination of the radical species, such as reduced ligand's aromatic moiety and strong oxidizing agent, i.e. sulphate radicals. This study was conducted to investigate ECL spectra, kinetic and integral ECL intensity relative to the porous aluminium oxide layer thickness.     

2-噻吩乙醛酸-邻菲罗啉-铕配合物的合成、结构表征及荧光性能的研究

合成了铕与 2 噻吩乙醛酸 (HL)和邻菲罗啉 (phen)的配合物 ,用元素分析、电导率、红外光谱和核磁共振谱测定了配合物的分子式为 [EuL2 phen·(H2 O) 3 ]NO3 ;配合物中的Eu(Ⅲ )离子与 2 噻吩乙醛酸和水分子中的O原子以及邻菲罗啉中的N原子配位。在室温下测定了配合物的激发和发射光谱 ,配合物中Eu(Ⅲ )离子的5D0 7F1和5D0 7F2 跃迁分别位于 5 92和 6 18nm。该固体配合物于室温下被紫外光激发可以发出强的特征红色荧光。IR光谱中 ,2 噻吩乙醛酸的特征吸收峰νCO (1719cm-1) ,νC—O(12 32cm-1) ,δO—H(90 9cm-1)在形成配合物后消失。在配合物中出现—COO-的反对称νas(16 4 2cm-1)和对称νs(14 0 8cm-1)伸缩振动吸收峰。在1HNMR谱图中 ,2 噻吩乙醛酸环上的 3个氢原子的化学位移形成配合物后移向高场 ,邻菲罗啉环上 4种不同环境的质子峰的化学位移形成配合物后向低场移动。从TG曲线可以看出 ,此配合物在常温至 2 5 0℃以下是稳定的。     

Luminescence of europium-doped anode oxide films on titanium-aluminum composites

The luminescence of europium in anode oxide films (AOF) on titanium-aluminum film composites is investigated. It is shown that the intensity distribution in the continuous and line luminescence spectra of europium introduced into the AOF directly in the process of anodic oxidation essentially depends on the sequence of arrangement of the layers of metal films and on the temperature of their heat treatment preceding the process of anodic oxidation. It is established that the nature of the luminescence spectrum of the AOF correlates with the chronovoltammetry diagrams of anodic oxidation. Composites with a high degree of europium doping are found and methods of searching for composites for creating new materials of electronic technology are outlined. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 67, No. 2, pp. 270–272, March–April, 2000.     

Eu（Ⅲ）烟酸,邻菲咯啉三元配合物的合成,光谱性质及荧光性能 …

本文报道了Ｅｕ（Ⅲ）与烟酸及邻菲咯啉形成的三元固态配合物。通过元素分析,热谱分析和摩尔电导确定其化学组成为ＲＥ（Ｐｈｅｎ）Ｌ３,并利用红外,紫外光谱、核磁共振谱和Ｘ－射线粉末衍射对配合物进行了表征。研究了配合物的荧光性质。