Synthesis and photoluminescent characterization of ceramic phosphors Li₂MgGeO₄:Ln³⁺ (Ln³⁺ = Pr³⁺ or Tm³⁺) under different excitation wavelengths

Abstract

Luminescence properties of Li2MgGeO4:Ln3+ (Ln = Pr, Tm) depend significantly on the excitation wavelengths. Several emission bands are observed, which can be assigned to ceramic matrix and characteristic transitions of Pr3+ and Tm3+ ions.

Multicolor tunable bright photoluminescence in Ca2+/Mg2+ modified Eu3+ doped ZnGa2O4 phosphors under UV excitation for solid state lighting applications

“…[1][2][3][4][5][6][7] This is possible due to the presence of a large number of meta-stable energy levels in the rare earth ions. [8][9][10][11][12] The rare earth ions, such as Eu 3+ , Tb 3+ , Tm 3+ , Dy 3+ , etc., emit red, green, blue and yellow colors respectively, in different host matrices. 2,[5][6][7] Thus, a combination of these rare earth ions, such as Dy 3+ /Eu 3+ , Sm 3+ /Eu 3+ , Tb 3+ / Eu 3+ , etc.…”