钇对铕-β-二酮螯合物的荧光增强作用

THE FLUORESCENCE ENHANCEMENT EFFECT OF YTTRIUM ON EUROPIUM(Ⅲ)-DIKETONE

应用荧光光谱、吸收光谱及荧光寿命测量研究了TritonX-100中,Eu(Ⅲ)-Y-TTA-phen的发光增强现象及可能的增强机理,认为这种发光增强是由于钇络合物的“包围”作用和从钇络合物到铕络合物分子之间经三重态-三重的能量传递。

The fluorescence enhancement phenomenon of Y-Eu(Ⅲ)-TTA-phen in Triton X-100 micellar solution has been studied. Fluorescence absorption, emission and decay time of Eu^(3+) complexed with β-diketone system in micellar solution containing TritonX-100 were observed. We found that in the complex system the fluorescence of intensification of Y on Eu^(3+) inoreased rapidly. The cause of the fluorescence enhancement effect, we consider, is as follows. First, radiationless relaxation deactivation process of the Eu^(3+) electronic levels by interaction with H_2O vibrational levels were reduced at the presence of Y ion in the solution. Second, probably the energy transfer from Y-complex to Eu-complex had taken place. In addition, the RE with inert structure also increased in Eu^(3+) luminescence in the same system. The sequence of the increase is: Gd^(3+)>Y^(3+)>Lu^(3+). Another RE (Sm^(3+),Nd^(3+)) having luminescence properties, however, decreased in the Eu^(3+) luminescence intensities. The red shifts of the absorption peaks of Eu^(3+) complex by Y, Gd and Lu were measured. The red shifts indicat that the lowest singlet stats (S_1) had decreads. Therefore, transition probability from S_1 to T_1 had incresed. Thus, the energy transfer from T_1 to ~5D_(0,1) levels of the centeral Eu^(3+) had been further enhanced.