稀土-二苯甲酰甲烷、邻菲咯啉固态配合物及其掺杂硅胶共发光效应的光声光谱研究

合成了Eu(Dbm)₃·Phen同核和Eu_0.8Ln_0.2(Dbm)₃·Phen(Ln:Er³⁺,Y³⁺)异核固体配合物微晶粉末及其掺杂的SiO2凝胶样品,在300～800nm范围内测定了其光声光谱.结果表明,配合物Eu_0.8Er_0.2(Dbm)₃·Phen,Eu(Dbm)₃·Phen和Eu_0.8Y_0.2(Dbm)₃·Phen配体吸收处的光声强度依次减弱;而Eu_0.8Y_0.2(Dbm)₃·Phen和Eu(Dbm)₃·Phen配合物掺杂的凝胶则情况相反.研究发现,光声强度与稀土配合物分子中能量传递过程相关,Er³⁺,Y³⁺离子的引入改变了三元配合物的弛豫过程,且配合物在粉末状态和凝胶状态的弛豫历程不尽相同.结合荧光光谱,从无辐射跃迁和辐射跃迁的角度分析了标题化合物在两种不同固体状态下的发光性质.

Photoacoustic Spectroscopy Study of the Co-luminescence Effect of Lanthanide-dibenzoylmethane, Phenanthroline Complex Powders and Their Doped Silica Gels

Eu(Dbm)3·Phen and Eu0.8 Ln0.2 (Dbm)3·Phen(Ln: Er3+, Y3+; Dbm: dibenzoylmethane; Phen: phenanthroline) complex powders and their doped silica gels have been prepared. Their photoacoustic(PA) spectra have been detected and interpreted for the first time. In the region of ligand absorption, the PA intensity decreases for Eu0.8 Er0.2(Dbm)3·Phen, Eu(Dbm)3·Phen and Eu0.8 Y0.2 (Dbm)3 ·Phen respectively. While for Eu(Dbm)3·Phen and Eu0.8 Y0.2 (Dbm)3·Phen doped silica gels, the reverse is true. It is found that the PA intensity bears a correlation with the energy transfer processes of the complexes. The additions of Er3+, Y 3+ ion change the relaxation processes of the complexes and the relaxation processes of ternary complexes are different in the two kinds of solid states. The changes of fluorescence spectra turn out to be complementary to the PA spectra. The luminescence properties of the complex powders and their doped silica gels are interpreted in depth from two aspects: nonradiative process and radiative process.