稀土掺杂镝(Ⅲ)乙酰丙酮邻菲咯啉三元配合物的合成和荧光性质

合成了三个系列稀土掺杂镝乙酰丙酮(Hacac)邻菲咯啉(phen)三元配合物RE_xDy_1-x(acac)₃phen(RE=La,Y,Gd;x=0,0.10,0.20,0.30,0.50,0.70,0.90,1.00),通过紫外光谱、红外光谱、X射线粉末衍射对配合物进行了表征。对各系列配合物进行荧光光谱研究,发现La³⁺、Y³⁺、Gd³⁺对Dy³⁺离子均有荧光增敏作用,它们对Dy³⁺离子的荧光增强顺序为I(La³⁺)>I(Y³⁺)≈I(Gd³⁺)。当x=0.10~0.30,所有掺杂配合物的荧光强度都大于未掺杂的配合物Dy(acac)₃phen的荧光强度。

Syntheses and Photoluminescence Properties of Dy3+-Acetylacetone-1,10-Phenanthroline Ternary Complexes Doped with Rare Earth Ions

Rare earth complexes with organic ligands,such as β-diketone,often show efficient photoluminescence(PL) because of the strong absorption of the organic ligands and efficient energy transfer from the triplet state of ligands to rare earth ions under the excitation of near ultraviolet light.The introduction of anotherlig and and addition of La³⁺,Y³⁺ or Gd³⁺ can considerably enhance the fluorescence intensity of rare earth complexes.In recent years,there has been considerable interest in the luminescence properties of Eu³⁺ and Tb³⁺ complexes,but little attention has been paid to the Dy³⁺ complexes.In this study,three series of solid complexes RE_xDy_1-x(acac)₃phen(RE=La,Y,Gd;x= 0,0.10,0.20,0.30,0.50,0.70,0.90,1.00) were obtained by the reaction of acetylacetone(Hacac),1,10-phenanthroline(phen) and mixed rare earth chloride of DyCl₃ and RECl₃ in 95% CH₃CH₂OH solution.These complexes were characterized via IR,UV spectra and XRD.The results showed that the two O atoms of acac-and the two N atoms of phen coordinate with RE³⁺,and these complexes have similar structure.The PL properties of these complexes were also studied.The relation between their PL intensities and the content of doped ions is also discussed.The experimental results showed that the PL intensities of Dy³⁺ complexes were enhanced after doping La³⁺,Y³⁺ or Gd³⁺.When x is within the range between 0.10 and 0.30,the PL intensities of all doped complexes are stronger than that of the pure Dy³⁺ complex Dy(acac)₃phen.Furthermore,among these three rare earth ions,La³⁺ is better than Y³⁺ and Gd³⁺ in sensitizing the fluorescence of Dy³⁺.