Photoluminescence in the Pr-doped SrTiO3-(Li0.5La0.5)TiO3 system was investigated. The system was characterized by a very intense red emission, at 611nm, which corresponded to the 1D2 → 3H4 inner transition of Pr3+ ions. A weak photoluminescence intensity in Pr-doped SrTiO3 was markedly increased when Sr atoms were replaced by (Li,La) pairs. By means of the elemental analysis of Li atoms, the dependence of the photoluminescence intensity upon the composition and heating temperature was correlated with the number of defect sites for Li atoms. On the basis of the experimental data, it was proposed that the substitution of (Li,La) pairs for Sr probably produced holes trapped near to Li+. The increased recombination probability of electrons and trapped holes was then expected to cause the highly enhanced emission intensity of Pr3+ via the resultant energy transfer.

Highly Enhanced Photoluminescence of SrTiO3:Pr by Substitution of (Li0.5, La0.5) Pair for Sr. K.A.Hyeon, S.H.Byeon, J.C.Park, D.K.Kim, K.S.Suh: Solid State Communications, 2000, 115[2], 99-104