Inscriere cercetatori

Asociatia Ad Astra a cercetatorilor romani lanseaza BAZA DE DATE A CERCETATORILOR ROMANI DIN DIASPORA. Scopul acestei baze de date este aceea de a stimula colaborarea dintre cercetatorii romani de peste hotare dar si cu cercetatorii din Romania. Cercetatorii care doresc sa fie nominalizati in aceasta baza de date sunt rugati sa trimita un email la

Effects of thermal treatment on the luminescence of YAG:Eu nanocrystals synthesized by a nitrate-citrate sol-gel method

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: S. Georgescu, A. M. Chinie, A. Stefan, O. Toma

Editorial: Journal of Optoelectronics and Advanced Materials, 7, p.2985-2990, 2005.


YAG:Eu nanopowders were synthesized by the nitrate-citrate sol-gel method. The morphologic modifications of the nanocrystallites produced by the thermal treatments at various temperatures are monitored by two parameters obtained from optical fluorescence spectroscopy: intensity ratio of the transition 5D0-7F2 and 5D0-7F1 and the maximum splitting of the 7F1 level. An abrupt change of both parameters is observed at the amorphous-crystalline phase transition, followed by their gradual decrease with the annealing temperature. This fact was explained by an increase of the symmetry of the Eu3+ ion neighborhood.

Cuvinte cheie: YAG:Eu, Luminescenta, Nanocristal, Metoda Sol-Gel // YAG:Eu, Luminescence, Nanocrystal, Sol-Gel Method