Wydział Chemii

Mirosław Karbowiak

Jakub Cichos

2016

Journal of Alloys and Compounds

673

258-264

10.1016/j.jallcom.2016.02.255

Naukowa

Angielski

Artykuł

During thermolysis of metal trifluoroacetates in high boiling organic solvents the two Ba_1−xRE_xF_2+x phases with cubic fluorite-type structure are formed in BaF₂-YF₃ system. In contrast to previous reports formation of so-called ‘BaYF₅’ nanocrystals was not observed. Besides the X-ray diffraction analysis the samples doped with optically active Eu³⁺ and Er³⁺ ions were characterized with photoluminescence spectroscopy and results provided by both methods corroborates each other. Upconversion emission observed under excitation at 980 nm for the Ba_1−xY_xF_2+x phase co-doped with Yb³⁺ and Er³⁺ ions is strongly composition dependent. Its intensity increases with increasing of REF₃ content for 0.2 < x < 0.45, whereas the opposite trend is evident for x > 0.45 and upconversion emission is totally quenched for x > 0.6. The important outcome of the present study is that compositions other than that with x = 0.5 should be probed to fully benefit from photoluminescence potential of Ba_1−xRE_xF_2+x nanofluoride phases activated with lanthanide ions.

BaF2-YF3 system, Fluoride nanoparticles, Nanofluorides, Upconversion

http://dx.doi.org/10.1016/j.jallcom.2016.02.255

http://www.elsevier.com