Estudos fotoluminescentes em compostos de íons terras raras coordenados por um derivado carbazólico Photoluminescence studies in rare earth ions coordinated by a carbazolic derivative
oleh: Renata Figueredo Martins, Cláudio Roberto Neri, Paulo Cesar de Sousa Filho, Osvaldo Antonio Serra, Kleber Thiago de Oliveira
| Format: | Article |
|---|---|
| Diterbitkan: | Sociedade Brasileira de Química 2010-01-01 |
Deskripsi
<abstract language="eng">[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.