Premium
Kinetic Model of Energy Transfer Processes Between Low‐Coordinated Ions on MgO by Photoluminescence Decay Measurements
Author(s) -
Chizallet Céline,
Costentin Guylène,
Krafft JeanMarc,
LauronPernot Hélène,
Che Michel
Publication year - 2006
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200500580
Subject(s) - photoluminescence , excited state , ion , phosphorescence , excitation , kinetic energy , energy transfer , atomic physics , wavelength , chemistry , analytical chemistry (journal) , kinetics , fluorescence , materials science , molecular physics , physics , optics , optoelectronics , organic chemistry , quantum mechanics , chromatography
10.1002/cphc.200500580.abs 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 { λ exc ; λ em }. Species A corresponds to { λ exc =240 nm; λ em =380 nm}, whereas the couple { λ exc =280 nm; λ 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.