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Preparation, characterization and luminescence behavior of some samarium complexes

Rare Metals 2021年第9期40卷 2618-2626页

作者： Archana Chauhan ritu langyan Department of Chemistry Kurukshetra UniversityKurukshetra 136119India

The synthesis of luminescent complexes of Sm(III) with the general formula [Sm(L)_(3)·(X)] was done in powder form. In the formula, L is 6-methyl-4-oxo-4 H-1-benzopyran-3-carboxaldehyde and X represents 2H_(2)O(C1), 1,10-phenanthroline(C2), 2,20-bipyridine(C3);bathophenanthroline(C4) and neocuproine(C5). The complexes were characterized by using various analytical and spectroscopic tools like elemental analysis, electrospray ionization mass spectrometry(ESI–MS+), Fourier transform infrared spectroscopy(FTIR), ultraviolet–visible(UV–Vis) spectroscopy, thermo-gravimetric analysis/differential thermal gravimetric analysis(TGA/DTG), field emission scanning electron microscopy(FESEM), powder X-ray diffraction(XRD), and photoluminescence(PL)studies. TGA/DTG showed high thermal stability of synthesized complexes. Powder XRD depicts that the average particle size lies in the nano-range. On monitoring at the excitation wavelength of 370 nm, the complexes display characteristic luminescence peaks of Sm(III) at ~564,~600 and ~647 nm assigned to^(4)G_(5/2)→^(6)H_(5/2),^(4)G_(5/2)→^(6)H_(7/2), and ^(4)G_(5/2)→6H9/2 transitions, respectively, with the most intense transition at ~600(orange emission) and~647 nm(bright red emission) in liquid and powder state, respectively. The investigations demonstrate that the synthesized novel complexes might be practically useful in electroluminescent devices, bio-assays, and liquid lasers due to their attractive photoluminescent properties.

关键词： Samarium complexes Luminescence Thermal analysis Quantum yield

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Synthesis,characterization and photoluminescent properties of Eu(Ⅲ)complexes with 5-hydroxy-2-hydroxymethyl-4H-4-pyranone and N,N’-donor heterocyclic coligands

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Rare Metals 2021年第5期40卷 1118-1125页

作者： Shammy Laj Dhania Archana Chauhan ritu langyan Department of Chemistry Kurukshetra UniversityKurukshetra 136119India

In present work,five novel europium complexes[Eu(L)3·Phen(2),Eu(L)3·Bipy(3),Eu(L)3·Neo(4),Eu(L)3·Biq(5)and Eu(L)3·Batho(6)]were synthesized,derived from[Eu(L)3·2 H_(2)O](1)complex by using ligand(HL)5-hydroxy-2-(hydroxymethyl)-4 H-pyran-4-one and coligands 1,10-phenanthroline,bipyridine,neocuproine,2,2’-biquinoline and *** order to seek excellent photoluminescent properties,coligands were introduced in the complexes to form a rigid conjugated system,thus enhancing luminescence properties of *** synthesized complexes reveal four narrow characteristic emission lines of Eu(III)consistent with ^(5)D0→^(7)FJ transitions,where J=0,1,2 and 3 at about 580,595,614 and 650 nm,*** ^(5)D0→^(7)F_(2) transition is responsible for strong red *** coordinate diagram also indicates that x,y coordinates lie in deep red *** data are in favour of high thermal stability of synthesized *** to their high thermal stability and strong red luminescence,these complexes might be used in fabrication of optoelectronic devices.

关键词： Photoluminescence Europium complexes Color coordinates Optoelectronic devices Thermal stability

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