Wydział Chemii

Damian Pasiński

Eugeniusz Zych

Jerzy Sokolnicki

2015

Journal of Alloys and Compounds

653

636-642

10.1016/j.jallcom.2015.08.277

Naukowa

Angielski

Artykuł

Ce³⁺ and Mn²⁺ singly doped and co-doped Sr₃Y₂Ge₃O₁₂ phosphors were synthesized by the solid–state reaction. In these phosphors Ce³⁺ ions occupy exclusively the Sr²⁺ site while Mn²⁺ ions mostly the Y³⁺ site with some traces in the Sr²⁺ site. Under excitation at 430 nm into the Ce³⁺ absorption band the Sr₃Y₂Ge₃O₁₂: Ce³⁺, Mn²⁺ phosphor emits green light from Ce³⁺ (530 nm) and red light from Mn²⁺ (630 nm) due to the Ce³⁺ → Mn²⁺ energy transfer. By appropriate ratio of the active ion concentrations the Ce³⁺ and Mn²⁺ co-doped Sr₃Y₂Ge₃O₁₂ phosphor can generate lights from green to orange region. We showed that the mechanism of energy transfer from Ce³⁺ to Mn²⁺ is of the resonance type and it occurs via an electric dipole–dipole interaction. Furthermore, we calculated the critical distance for Ce³⁺ → Mn²⁺ energy transfer to be 16.90 Å by concentration quenching methods.

Garnet structure, Ce3+, Mn2+, energy transfer, white LEDs

http://dx.doi.org/10.1016/j.jallcom.2015.08.277

http://www.elsevier.com