Spectroscopic properties of K4SrSi3O9 doped with Sm3+

Sm3+ doped K4SrSi3O9 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. K4SrSi3O9:Sm3+ exhibits red-orange luminescence originating mainly from equally intense (4)G(5/2)-> H-6(7/2) (with its maximum at 598.5 nm) and (4)G(5/2)-> H-6(9/2) (at 651 nm) transitions. The luminescence is quenched in the samples doped above 2% of Sm3+ due to non-radiative energy transfer between Sm ions at different sites. The interaction between Sm3+ ions is dipole-quadrupole type and the critical radius for energy transfer was calculated from Inokuti-Hirayama model to be 15.0 angstrom and 14.2 angstrom for 300 K and 77 K respectively. (C) 2015 Elsevier B.V. All rights reserved.