Kinetic model of energy transfer processes between low-coordinated ions on MgO by photoluminescence decay measurements.
Photoluminescence decay studies of emitting species on MgO nanocubes at room temperature provide evidence of three surface species characterized by an excitation and emission wavelength couple {lambda(exc);lambda(em)}. Species A corresponds to {lambda(exc)=240 nm; lambda(em)=380 nm}, whereas the couple {lambda(exc)=280 nm; lambda(em)=470 nm} is assigned to two species: B and B', the former is involved in energy transfer from excited state A* and the latter in direct emission from excited state B'*. A simple model for energy transfer from species A* to B is proposed. The numerical resolution of equations corresponding to this model is in good agreement with experimental data. This method quantifies the kinetics of intrinsic emission and energy transfer processes. Lifetime values indicate that phosphorescence is taking place, and species A, B and B' are identified as edge O(2-) (4 C), corner O(2-) (3 C) and kink O(2-) (3 C) oxide ions respectively.
Chizallet
Céline
C
Laboratoire de Réactivité de Surface, UMR 7609 CNRS, Université Pierre et Marie Curie, 4 place Jussieu, 75252 Paris Cedex 05, France. chizalle@ccr.jussieu.fr
Costentin
Guylène
G
Krafft
Jean-Marc
JM
Lauron-Pernot
Hélène
H
Che
Michel
M
D004735:Energy Transfer; D007477:Ions / Q000737:chemistry; D007700:Kinetics; D008163:Luminescent Measurements; D008277:Magnesium Oxide / Q000737:chemistry*; D008956:Models, Chemical; D010777:Photochemistry
D007477:Ions; D008277:Magnesium Oxide