稀土三氟醋酸盐晶体的光谱特性

本文合成了系列稀土三氟醋酸盐晶体Re(CF3COO)3·3H2O](Re=Eu,Gd,Tb,Dy)和TbxY1-x(CF3COO)3·3H2O]2(x=0.05,0.10,0.15,0.20,0.25mol),测定其晶体结构属单斜晶系,空间群为P21/c;较详细地讨论了Eu3+,Gd3+,Tb3+,Dy3+在这些化学计量化合物中的光谱特性,以及在TbxY1-x(CF5COO)3·3H2O]中Tb3+的发光强度随其浓度的变化规律。

SPECTRAL PROPERTIES OF RARE EARTH TRIFLUOROACETATE CRYSTAL

A series of Rare Earth (R.E.) trifluoroacetate crystals Re(CF3COO)3· 3H2O]2(Re = Eu,Gd,Tb,Dy) and TbxY1-x(CF3COO33H2O]2 were prepared with hydrosolution method in room temperature; The crystal structure of this type of compounds has been determined with Nicolet R3M/E type Four Circle Diffractometer, which is monoclinic. The space group is P21/c. The R.E. trifluoroacelates have a dimeric structure Re(CF3COO)3·3H2O]2, viz. Z = 2. The characteristic spectral properties of stoichiometry compounds CRe(CF3COO)3·3H2O]2 (Re= Eu,Gd,Tb,Dy) are discussed in detail. In the emission spectra, the Eu3+ shows 1,3,5 lines corresponding to 5D0-7F2,1,2 transition respectivly, where the 5D0-7F2 transition shows stronger emission at 612nm. The number and intensities of the lines are in agreement with C2 orCsUnder ultraviolet excitation, the red emission (612nm) of the Eu3+, the green emission (544nm) of the Tb3+, the blue (480-488nm) and yellow(572-577nm) of Dy3+, and ultraviolet emission (312nm) of Gd3+ are observed in this type of crystal.The spectral intensities of TbxY1-x(CF3COO)3·3H2O]2 (x=0.05, 0.10, 0.15, 0.20, 0.25mol depend on the concentration of Tb3+. No fluorescence quenching occurs.