Synthesis and luminescence properties of novel SrScLiTeO6:Ln (Ln = Eu3+, Sm3+) phosphors for white LED applications

Novel Eu 3+ or Sm 3+ ions doped SrScLiTeO 6 phosphors were successfully prepared by a solid-state reaction, and the phase formation, crystal structure and luminescence properties of the samples were studied in detail. Under the excitation of 394 nm, the SrScLiTeO 6 :Eu 3+ phosphors show the strongest emission peak located at 615 nm corresponding to the electric dipole 5 D 0 → 7 F 2 transition. The SrScLiTeO 6 :Sm 3+ phosphors show orange–red light upon near-ultraviolet ( n -UV) excitation, and the strongest emission peak occurs at 597 nm, corresponding to the 4 G 5/2 → 6 H 7/2 transition. The critical quenching concentrations of Eu 3+ and Sm 3+ ions in the SrScLiTeO 6 phosphors were about 0.08 mol and 0.02 mol, and the corresponding concentration quenching mechanisms were verified to be the dipole–dipole interaction. Due to the different energy transfer between different energy levels, the decay times of Eu 3+ and Sm 3+ ions are different. The fluorescent thermal quenching studies showed the SrScLiTeO 6 :Sm 3+ phosphors had high thermal-stable properties. The above results indicate that synthetic phosphors have potential application in white light emitting diodes ( w -LEDs).