| Zugriffsnummer | 12871 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Optical properties of Se2- and Se2 color centers in the red selenium ultramarine with the sodalite structure |
| Autor(in); Institution |
Göbel, Ernst Otto; Präsidium, P, PTB-Braunschweig
Schlaich, H.
Lindner, G. G.
Feldmann, Jochen; LMU München, Sektion Physik, München, GERMANY
Reinen, D.; Univ. Marburg, FB Chemie, Marburg, GERMANY
|
| Quelle/Jahr | Inorganic Chemistry: 39 (2000), 13, 2740 - 2746 |
| ISSN | 0020-1669 |
| DOI | |
| Zusammenfassung | The unique optical properties of Se-2(-) radicals located in the cages of the sodalite structure are reported. By means of luminescence, photoluminescence excitation, and absorption spectroscopy, three different centers are identified. Two of them are Se-2(-) anions in sites with presumably a tetrahedral Na-4(4+) coordination and a Na-3(3+) environment with cation deficiency, respectively, giving rise to a red luminescence band with two different progressions. The third center is the intermediate Se-2 molecule, created photochemically by UV laser excitation. It induces an additional blue luminescence. The electronic properties of the Se-2(-) centers, particularly in the excited states, are significantly fluenced by steric constraints imposed by the limited space in the sodalite host polyhedra. Thus, the sodalite structure can be viewed as a model system for studying effects of this kind on chromophores imbedded in the cages of the zeolite-type lattice. |
