PHOTOLUMINESCENCE OF EU3+ AND BI3+ IN NA3YSI3O9

Optical characteristics of EU(3+) and Bi3+ in the Na3YSi3O9 host latti ce have been studied. There is a single and highly symmetric site of E u3+ ion in Na3YSi3O9 host lattice. The charge transfer state of EU(3+) ion lies in high-energy region close to the fundamental absorption do main of the host lattice. One absorption band for S-1(0) --> P-3(1) tr ansition of Bi3+ was found in Na3YSi3O9. The wavelength of maximum lum inescence intensity of Bi3+ (P-3(1) --> S-1(0)) is red-shifted as the Bi3+ concentration increases. Concentration quenching of the fluoresce nce from Bi3+ has been observed above 2 mol.% of concentration. Energy transfer between Eu3+ and Bi3+ is not efficient in this host due to t he energy mismatch. Copyright (C) 1996 Published by Elsevier Science L td