Synthesis and characterization of Ca2Sn1-xCexO4 with blue luminescence originating from Ce^4＋ charge transfer transition

Ce^4＋-doped Ca2SnO4 with a one-dimensional structure, which emits bright blue light, is prepared by using a solid-state reaction method. The x-ray diffraction results show that the Ce^4＋ ions doped in Ca2SnO4 occupy the Sn^4＋ sites. The excitation and emission spectra of Ca2Sn1-xCexO4 appear to have broad bands with peaks at - 268nm and -442nm, respectively. A long excited-state lifetime （-83μs） for the emission from Ca2Sn1-xCexO4 suggests that the luminescence originates from a ligand-to-metal Ce^4＋ charge transfer （CT）. The luminescent properties of Ca2Snl_xCexO4 have been compared with those of Sr2CeO4, which is the only material reported so far to show Ce^4＋ CT luminescence. More interestingly, it is observed that the emission intensity of Ca2Sn1-xCexO4 with a small doping concentration （x - 0.03） is comparable to that of Sr2CeO4 in which the concentration of active centre is 100%.     

An X‐shaped π‐conjugated polymer comprising of fluorene units and anthracene units with high efficiency. Synthesis and optical and electrochemical properties

A new X‐shaped π‐conjugated monomer comprising of fluorene units and anthracene units was synthesized, and it was used to fabricate the new X‐shaped π‐conjugated polymers and investigate the properties of the new polymers. Using different molar ratios between such monomer and a fluorene monomer gave three polymers that showed higher absolute PL quantum yields than the linear polyfluorene (PF) in the solid state. After thermal annealing at 200 °C for 4 h, the linear PF showed an additional bathochromic emission at about 550 nm, whereas such red‐shifted emission was fully eliminated for the X‐shaped polymers. The electroluminescent devices based on the X‐shaped polymers with a configuration of ITO/PEDOT:PSS/polymer/LiF/Ca/Al displayed blue emission with low turn‐on voltage and high brightness. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 5616–5625, 2008     

有机低维结构EL器件的特性

近年来，有机电发光器件已经有了很大进展，寿命也已突破万小时，尽管如此，如何更进一步提高发光效率仍是人们所关注的热点。通过与无机半导体低维结构特性的类比，指出对某些有机材料体系,低维结构同样可以改善器件的性能。     

稀土配位聚合物{(H_2prz)[Ln_2(pzdc)_4(H_2O)_2]·5H_2O}_n(Ln=Eu,Tb)的合成、结构和性质

以Ln(NO3)3、H2pzdc(2,3-吡嗪-二羧酸)和prz(哌嗪)为原料,在水热条件下得到了2个结构新颖的稀土配位聚合物{(H2prz)[Ln2(pzdc)4(H2O)2]·5H2O}n(Ln=Eu(1),Tb(2))。对它们进行了元素分析、红外光谱、粉末X-射线衍射、热重等分析,并用X-射线衍射测定了它们的单晶结构。2个配合物的晶系都属于三斜晶系,P1空间群。研究了它们的荧光性质,固体荧光实验测试结果表明,2个配合物在室温下均表现出相应稀土离子的特征荧光发射。     

Synthesis and Crystal Structure of a New Zn(Ⅱ) Complex Exhibiting Strong Luminescence

The title complex,[Zn(ip)2(H2O)2][ZnCl4]·H2O·2DMF 1(ip=imidazo[4,5-f][1,10] phenanthroline),has been synthesized via the slow evaporation of concentrated reaction solution at room temperature.It was characterized by single-crystal X-ray diffraction.Crystal data for C32H36Cl4N10O5Zn2:white prism,0.17mm×0.15mm×0.10mm,monoclinic,space group P2/c,a=11.928(8),b=9.868(6),c=16.520(11),β=104.879(12)°,V=1879(2)3,Z=2,Mr=913.25,Dc=1.614 g/cm3,F(000)=932,μ=1.616 mm-1,λ(MoKα)=0.71073,GOOF=1.045,R=0.0710 and wR=0.1755 for 3055 observed reflections with Ⅰ2σ(Ⅰ).X-ray diffraction study reveals that the title complex has an interesting 3D architecture via hydrogen bonding interactions and π-π interactions.The IR,TGA,XRD and luminescent properties of complex 1 were also studied.     

Synthesis,Crystal Structure and Luminescent Property of a New Copper (Ⅰ) Iodide Complex Based on 3,5-Dimethy1-4-amino-triazole

The title compound, [Cu_4I_4(C_4H_8N_4)_4], has been synthesized and characterized by single-crystal X-ray diffraction analysis. It crystallizes in monoclinic, space group Pbca, with α =18.1851(10), b = 9.3697(5), c = 19.8034(10)(A), V= 3374.3(3) (A)~3, C_(16)H_(32)Cu_4I_4N_(16), M_r = 1210.34, Z= 4, Dc= 2.383 g/cm~3,μ = 6.183 mm~(-1), F(000) = 2272, S = 1.032, the final R = 0.0309 and wR =0.1180 for 3854 observer reflections (I＞ 2σ(I)). The structure of the title compound consists of tetranuclear copper cluster units bridged by the halogen atoms with the 3,5-dimethyl-4-aminotriazole ligands coordinated to the metal ions through the triazole nitrogen atoms. The luminescent property of 1 was also studied.     

Synthesis,Crystal Structure and Luminescent Property of a New Copper(Ⅰ) Iodide Complex Based on 3,5-Dimethyl-4-amino-triazole

The title compound,[Cu4I4(C4H8N4)4],has been synthesized and characterized by single-crystal X-ray diffraction analysis.It crystallizes in monoclinic,space group Pbca,with a=18.1851(10),b=9.3697(5),c=19.8034(10),V=3374.3(3)3,C16H32Cu4I4N16,Mr=1210.34,Z=4,Dc=2.383 g/cm3,μ=6.183 mm-1,F(000)=2272,S=1.032,the final R=0.0309 and wR=0.1180 for 3854 observer reflections(I2σ(I)).The structure of the title compound consists of tetranuclear copper cluster units bridged by the halogen atoms with the 3,5-dimethyl-4-aminotriazole ligands coordinated to the metal ions through the triazole nitrogen atoms.The luminescent property of 1 was also studied.     

Synthesis,Crystal Structure and Photoluminescence of a Three-dimensional Zinc(Ⅱ) Coordination Polymer with(20~3)_2(20)_3 Topology

The title compound,[Zn2(H2C4BIm)(ox)2]·2H2O(1,H2C4BIm = 2,2'-(1,4-bu-tanediyl)bis(1H-benzimidazole),has been synthesized by the hydrothermal reaction of Zn(NO3)2·6H2O with H2C4BIm and Na2C2O4 in water solution.It crystallizes in the triclinic system,space group P1 with a = 9.445(9),b = 9.598(9),c = 14.962(14) ,α = 72.160(10),β = 79.905(12),γ = 83.680(11)°,Mr = 633.18,V = 1269(2) 3,Z = 2,Dc = 1.657 g/cm3,F(000) = 644,μ = 1.953 mm-1,the final R = 0.0671 and wR = 0.1689.X-ray crystal structure analysis revealed that 1 is a 3D network with(203)2(20)3 topology in which the ZnII atom can be considered as a 3-connected node and both ox2-and H2C4BIm serve as the linear linkers.     

新型双β-二酮、邻菲罗啉和铕(Ⅲ)三元配合物的合成与发光

合成了一个新型双β-二酮有机配体1,3-双[3-(2-噻吩基)-3-氧代丙酰基]苯、邻菲罗啉和铕的三元配合物,并应用红外光谱、紫外-可见光谱、元素分析和热重-差热分析等对配合物进行了组成确定和结构表征.荧光分析结果表明,配合物612 nm处的发射光谱为中心离子Eu3+的特征红光,属5D0→7F2跃迁带,峰形尖锐,单色性...     

发光温敏漆的制备及其温度猝灭特性研究

以三氯化钌、2—2联吡啶为主要原料,甲基丙烯酸甲酯为基质,制备了钌联吡啶／聚甲基丙烯酸甲酯发光温敏漆,并对其温度猝灭特性进行了研究。扫描电镜观察发现钌联吡啶为规则的层状六边形结构;差热-热重测试表明钌联吡啶在320℃发生分解。紫外吸收光谱分析发现,温敏漆的适合激发光波长区间为410～500nm。荧光光谱测试结果表明温敏...