Luminescence and energy transfer of Sm3+-codoped $${{\text{Y}}_{2.9}}{\text{A}}{{\text{l}}_{4.25}}{\text{G}}{{\text{a}}_{0.75}}{{\text{O}}_{12}}:{\text{Ce}}_{{0.1}}^{{3+}}$$ phosphor

Abstract

$${{\text{Y}}_{{\text{2}}.{\text{9}} - {\text{x}}}}{\text{A}}{{\text{l}}_{{\text{4}}.{\text{25}}}}{\text{G}}{{\text{a}}_{0.{\text{75}}}}{{\text{O}}_{{\text{12}}}}:{\text{Ce}}_{{0.{\text{1}}}}^{{{\text{3}}+}},{\text{S}}{{\text{m}}_{\text{x}}}$$ (YAGG) (x = 0, 0.02, 0.04, 006, 0.08, 0.10) phosphors were prepared by high temperature solid state reaction method. X-ray diffraction and fluorescence spectrum techniques were used to analyze the samples. The luminescence and energy transfer properties of samples were discussed in detail. The results indicated that a new emission peak located at 617 nm corresponding to the 4G5/2 → 6H5/2 transition of Sm3+ ion were observed after co-doping of Sm3+ ions. Energy transfer from Ce3+ to Sm3+ ions was demonstrated in YAGG host based on the emission spectra which lead to the decreases of emission intensity of Ce3+ ions with the increase of Sm3+ concentration. The energy transfer efficiency between Ce3+ and Sm3+ ions as high as 69.3% was calculated. The energy transfer type from Ce3+ to Sm3+ ions was supposed to be a resonant type through dipole–dipole.