Luminescence and energy transfer in CaF2slightly doped with europium and manganese

Autor:	U G Caldino, J O Rubio, A F Munoz
Rok vydání:	1990
Předmět:	Ionic radius Chemistry Doping Analytical chemistry Physics::Optics chemistry.chemical_element Phosphor Condensed Matter Physics Acceptor Ion Condensed Matter::Materials Science Impurity General Materials Science Luminescence Europium Nuclear chemistry
Zdroj:	Journal of Physics: Condensed Matter. 2:6071-6078
ISSN:	1361-648X 0953-8984
Popis:	The optical properties (emission, excitation and lifetime data) of CaF2 slightly contaminated with Eu2+ and Mn2+ ions have been analysed in the present investigation. The optical properties of the systems CaF2:Eu2+ and CaF2:Mn2+ have also been studied in order to obtain a better characterisation of the optical properties of the CaF2:Eu:Mn phosphor material. The spectroscopic data obtained clearly indicate that energy transfer from the donor Eu2+ ions to the acceptor Mn2+ ions takes place in CaF2 even at the very low impurity concentrations employed in the authors' samples, suggesting therefore that the impurities are not randomly distributed in the lattice but rather occur as impurity clusters of Eu2+ to Mn2+. Some insight into the possible nature of the impurity complexes as well as of the Eu to Mn energy transfer mechanism taking place inside them were gathered with the help of Dexter's theory for energy transfer phenomena. The results presented in this paper give support to the ionic radius criterion proposed by Rubio et al. (1985-9) to predict impurity pairing in a solid material.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6f8860cdab2766db4b6c2a48fadbc019 https://doi.org/10.1088/0953-8984/2/27/011 Zobrazit plný text záznamu