Research on the luminescent and thermometric properties of MgMoO4: Er3+

A series of MgMoO 4 : x%Er 3+ ( x = 0, 1, 2, 3, 4, 5) phosphors were synthesized by high temperature solid-state reaction. The doping concentration of Er 3+ was optimized, and the thermometric properties of the phosphors were investigated based on the thermally coupled energy levels of Er 3+ ( 2 H 11/2 and 4 S 3/2 ) via the luminescence intensity ratio (LIR) technology. The absolute sensitivity (S A ) and relative sensitivity (S R ) of the samples were investigated with the maximum S R being 0.83% K −1 . To maintain the electrical neutrality of the phosphors and reduce lattice distortion of the hosts, a certain amount of charge compensators (Li + , Na + , K + ) were introduced into the phosphors. The luminescent intensity of the phosphors was enhanced greatly, and the thermometric properties were improved slightly with the maximum S R at 0.89% K −1 by the charge compensators.