Luminescence and energy transfer of Sm~(3+)-codoped Y_(2.9)Al_(4.25)Ga_(0.75)O_(12):Ce_(0.1)~(3+) phosphor

摘要

Y_(2.9)Al_(4.25)Ga_(0.75)O_(12):Ce_(0.1)~(3+) ,Sm_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 ~4G_(5/2) → ~6H_(5/2) transition of Sm~(3+) ion were observed after co-doping of Sm3+ ions. Energy transfer from Ce~(3+) to Sm~(3+) ions was demonstrated in YAGG host based on the emission spectra which lead to the decreases of emission intensity of Ce~(3+) ions with the increase of Sm~(3+) concentration. The energy transfer efficiency between Ce~(3+) and Sm~(3+) ions as high as 69.3% was calculated. The energy transfer type from Ce~(3+) to Sm~(3+) ions was supposed to be a resonant type through dipole-dipole.