Wydział Chemii

Damian Pasiński

Eugeniusz Zych

Jerzy Sokolnicki

2016

Journal of Luminescence

169

862-867

10.1016/j.jlumin.2015.02.044

Naukowa

Angielski

Artykuł

A series of Ce³⁺or Ce³⁺and Mn²⁺doped garnets of the general formula A₃B₂X₃O₁₂(A=Sr,Ca; B=Sc,Y; X=Si,Ge) was obtained using a high temperature solid state reaction. These compounds were characterized by X-ray diffraction and photoluminescence spectroscopy. The relation between luminescence properties of phosphors and their host lattice composition was studied. It was found that Ce³⁺ions occupied the A site and emitted in the green spectral region. Mn²⁺ions can exchange cations in both A and B sites showing green and red emissions, respectively and getting excited due to an energy transfer from Ce³⁺. This study showed the relationship between Ce³⁺and Mn²⁺emission/excitation wavelengths and the symmetry around the activator ions expressed by means of the distortion factor of the dodecahedral A site (d₈₈/d₈₁). Decay times of the Ce³⁺and Mn²⁺luminescence were measured and correlated with the compositional dependent structural changes.

Garnet structure, Germanates, luminescence

http://dx.doi.org/10.1016/j.jlumin.2015.02.044

http://www.elsevier.com