Self-Activated and Mn²⁺-Related Luminescence in Li_2–2xMg_2+x(MOO₄)₃ Single Crystals

The Mn²⁺-doped optical quality Li_2–2xMg_2+x(MoO₄)₃ single crystals were grown by the low-thermal-gradient Czochralski method. Photoluminescence (PL) and photoluminescence excitation (PLE) spectra for investigated crystals were studied at 77 K and 300 K. Green and red emission bands of Mn²⁺ are interpreted in terms of different structural positions that occupied by impurity manganese ions in Li_2–2xMg_2+x(MoO₄)₃. Absorption investigations show the characteristic Mn²⁺ absorption features, namely a sharp absorption peak at 410 nm. CIE investigation results show that Mn²⁺-doped Li_2–2xMg_2+x(MoO₄)₃ single crystals are prospective materials in pcWLED due to from green to red emission bands in PL spectrum. Correlated color temperatures (CCT) and color purity (CP) of investigated crystals were calculated.