Comparison of MgAl2Si2O8:Mn4+ systems doped with co-activator ions in terms of long lifetime for optoelectronic applications

Mn⁴⁺ doped and Pr^3+,4+, Sm³⁺, Gd³⁺, Tb^3+,4+, Ho³⁺, Er³⁺, Tm³⁺ and Yb³⁺ co-doped MgAl₂Si₂O₈-based phosphors were prepared by conventional solid state synthesis at 1300 °C. They were characterized by thermogravimetry (TG), differential thermal analysis (DTA), X-ray powder diffraction (XRD), photoluminescence (PL) and scanning electron microscopy (SEM). The luminescence mechanism of the phosphors, which showed broad red emission bands in the range of 600-715 nm and had a different maximum intensity when activated by UV illumination, was discussed. Such a red emission can be attributed to the intrinsic ²E→⁴A₂ transitions of Mn⁴⁺.