Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5402997 | Journal of Luminescence | 2009 | 5 Pages |
Abstract
Three-component luminescent material consisting of silica xerogel as a support with immobilized ZnS:Mn2+ nanocrystals and Tb3+ ions was compared with such two-component materials as the silica support with ZnS:Mn2+ as well as the support with Tb3+. In each case the nanocrystals and the lanthanide ions were immobilized at silica surface by impregnation procedure. Size of the ZnS quantum dots doped with Mn2+ were estimated by Scherrer method from the X-ray diffraction (XRD) pattern. The materials have been characterized by EPR and optical spectroscopy techniques. EPR spectra allow to distinguish two different Mn2+ sites: the first is assigned to isolated Mn2+ substitutionally and incorporated into cubic ZnS lattice and the second is ascribed to the Mn2+ situated near the nanocrystal surface. From the optical spectra we have found that in the three-component material, energy transfer from excited ZnS:Mn2+ nanocrystals to Tb3+ ions takes place. The different mechanisms of such transfer are discussed.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Magdalena Zalewska, Benedykt KukliÅski, Ewa Grzanka, Sebastian Mahlik, Julia Jezierska, Bogdan PaÅosz, Marek Grinberg, Andrzej M. KÅonkowski,