Dy3+ → Eu3+ energy transfer induced tunable luminescence in disordered La3Ga5SiO14:Dy3+/Eu3+ phosphors

Abstract

The Dy³⁺/Eu³⁺ activated La₃Ga₅SiO₁₄ phosphors were synthesized using a sintering process for 8 h at 1300 °C and their performance was investigated in detail using various characterizations. The Dy³⁺ single activated La₃Ga₅SiO₁₄ phosphor has the dominant emission band corresponding to the ⁴F_9/2 → ⁶H_13/2 transition of Dy³⁺, and the Eu³⁺ single activated La₃Ga₅SiO₁₄ phosphor has the dominant emission band corresponding to the ⁵D₀ → ⁷F₂ transition of Eu³⁺. These indicate that activators substitute La³⁺ sites with the C₂ symmetry in the Dy³⁺/Eu³⁺ activated La₃Ga₅SiO₁₄ phosphors. The Dy³⁺ → Eu³⁺ energy transfer occurs in the Dy³⁺/Eu³⁺ coactivated La₃Ga₅SiO₁₄ phosphors, which leads to the controllable luminescence in these phosphors.