PHOTOLUMINESCENCE STUDIES IN RARE EARTH IONS COORDINATED BY A CARBAZOLIC DERIVATIVE

摘要

PHOTOLUMINESCENCE STUDIES IN RARE EARTH IONS COORDINATED BY A CARBAZOLIC DERIVATIVE. [RE(czb)(3)(H2O)(2)] complexes (where RE = Eu3+, Tb3+, Gd3+; and czb = 4-(9H-carbazol-9-yl)benzoato) have been synthesized and characterized. The Gd3+ complex was used to determine the triplet state energy of the czb ligand. Photoluminescence measurements of the complexes have been carried out under UV excitation. The Tb3+ complex exhibited a strong green luminescence indicating an efficient antenna effect, whereas the Eu3+ complex showed low red luminescence and the Gd3+ complex a blue-green luminescence from the ligand. The luminescence lifetimes and quantum yields have also been measured for the evaluation of the spectroscopic behavior of the complexes.