Synthesis and photoluminescence properties of perovskite KMgF 3 :Eu nanocubes

KMgF 3 :Eu nanocubes with a mean edge length of ∼12 nm were synthesized by a hydrothermal method. Result of x-ray diffraction reveals that the nanocubes are perovskite phase. Under ultraviolet excitation, the broad emission bands from trace oxygen and color centers in KMgF 3 matrix were observed. In comparison with a bulk sample having the same chemical compositions, no characteristic emissions of Eu 2+ were observed, which can be attributed to the overlappment of the emissions of Eu 2+ and color centers in KMgF 3 :Eu nanocubes. In addition, the emissions of Eu 3+ were also detected, and the intensity ratio of 5 D 0 → 7 F 2 to 5 D 0 → 7 F 1 changed with excitation wavelength, indicating that the material has multiple luminescence centers or emitting states.