Photoluminescence and radioluminescence study of NaMgF3:Eu nanoparticles

Defect clustering in an Eu-doped NaMgF3 compound and its influence on luminescent properties

“…In this case, when the NaMgF 3 is excited at 256 nm the emission from Eu 2+ is observed at 366 nm, and when excited at 396 nm emission from Eu 3+ at 590 nm is observed. 22 Although the Eu 2+ /Eu 3+ ratio depends on the chemical composition of the host, 64 the synthesis method 65 and exposure to ionizing radiation, 66,67 our calculations suggest that, from the perspective of solution energy, the Eu ion prefers to be incorporated into NaMgF 3 in its divalent state (see Figs. 2 and 3).…”

“…The photoluminescence emission spectra of NaMgF 3 nanoparticles containing Eu, excited at 396 nm, for 1% Eu show 5 D 0 → 7 F J transitions from Eu 3+ . The emission spectrum reported by Gaedtke and William 22 at room temperature presents one peak corresponding to the 5 D 0 -7 F 0 transition, two peaks from 5 D 0 -7 F 1 , two peaks from 5 D 0 -7 F 2 , and four peaks from 5 D 0 -7 F 4 . 5 D 0 -7 F 1 is a magnetic dipole transition, which is not influenced by the crystalline environment.…”

“…William 22 shows that the 5 D 0 -7 F 1 transition is approximately 50% more intense than the 5 D 0 -7 F 2 transition. This suggests that the Eu 3+ ion occupies point symmetry with a distorted inversion centre, although the emission spectrum shows peaks corresponding to the 5 D 0 -7 F 0 and 5 D 0 -7 F 2 transitions.…”

“…Table 10 shows the experimental 22 and predicted 7 F 1 state energy sublevels and splittings. The energy sublevels are measured with respect to the barycentre of the 7 F 1 level.…”

“…20 Luminescent properties of NaMgF 3 nanoparticles doped with lanthanide ions and Mn, synthesized using a reverse micro-emulsion method, have been reported. 21,22 Furthermore, lanthanide ions doped into NaMgF 3 polycrystalline samples have also been prepared by the conventional solid-state reaction method. 23,24 In fact, lanthanide incorporation in compounds has been largely used to enhance luminescent properties.…”