Spectroscopic properties of K4SrSi3O9 doped with Sm3+

• DOI: 10.1016/j.jlumin.2015.12.031
• Publication Date: 2015-12-22T13:19:08Z
• Authors: B. Bondzior; D. Stefańska; A. Kubiak; P.J. Dereń
• Keywords: Ionic radius

Abstract Sm 3+ doped K 4 SrSi 3 O 9 red phosphor, was synthesized for the first time by the conventional solid state method. The X-ray powder diffraction confirmed that obtained phosphor was single phase. Excitation and emission spectra and decay curves were measured to characterize the luminescent properties of the obtained material. K 4 SrSi 3 O 9 :Sm 3+ exhibits red–orange luminescence originating mainly from equally intense 4 G 5/2 → 6 H 7/2 (with its maximum at 598.5 nm) and 4 G 5/2 → 6 H 9/2 (at 651 nm) transitions. The luminescence is quenched in the samples doped above 2% of Sm 3+ due to non-radiative energy transfer between Sm ions at different sites. The interaction between Sm 3+ ions is dipole–quadrupole type and the critical radius for energy transfer was calculated from Inokuti-Hirayama model to be 15.0 A and 14.2 A for 300 K and 77 K respectively.