铕-钆-二苯甲酰甲烷-氨体系荧光增强效应的研究

Studies on Fluorescence Enhancement Effect of Eu-Gd-DBM-NH_3- Organic Solvent System

报道了Eu-DBM-NH_3的溶剂效应和共发光效应。甲醇、丙酮和乙醇等溶剂对该体系有明显的增敏作用;Gd^(3+)、Y^(3+)、Tb^(3+)、La^(3+)和Lu^(3+)等可显著增强其荧光强度,并以Gd^(3+)效果最好。该体系可用于超痕量铕的测定,检出限为3.0×10^(-11)mol/L,比无Gd^(3+)时约降低2个数量级。

In the present paper, solvent and co-luminescence effects of Eu-DBM-NH3 system are reported. The results show that the organic solvents (such as methanol, acetone, ethanol) make the system to produce sensitized fluorescence considerably.A new fluorescence-enhanced phenomenon, which is produced by adding Gd3+, Y3+, Tb3+, La3+ and Lu3+ to Eu-DBM-NH3-acetone system, can be observed. Of these, Gd3+can enhance the fluorescence intensity by two orders of magnitude in comparison with that of the system without Gd3+. Eu-Gd-DBM-NH3-acetone system can be used for the determination of trace amount of Eu3+ in the range from 1. 0× 10-10 to 6. 0×1 0-8 mol/L. The detection limit is 3. 0× 10-11 mol/L.In addition, the luminescence mechanism of this system is discussed.