On the mechanisms of non-radiative energy transfer between lanthanide ions: centrosymmetric systems

resumo

In this work the aim is three-fold: 1) to call attention for shielding effects in the energy transfer rates between lanthanide ions. 2) to use a new model for treating the Judd-Ofelt Omega(K) intensity parameters in centrosymmetric systems by using a thermal root mean squared displacement around each ligating atom (ion) in the analysis of the intensity parameters. This might have an important role in ion-ion energy transfer processes, particularly when the lanthanide ions occupy a center of inversion. 3) To call attention to the fact that the quadrupole-quadrupole mechanism is dominant for ion-ion distances as far as 20 angstrom, provided shielding effects are taken into account. An illustrating comparison with respect to the weak quadrupole mechanism of 4f-4f transition rates is made.

palavras-chave

ORDER REGULAR APPROXIMATION; UN TUNGSTATE MIXTE; INTENSITY PARAMETERS; SPECTROSCOPIC PROPERTIES; OPTICAL-ABSORPTION; VISIBLE CONVERSION; 4F-4F TRANSITIONS; QUANTUM-DOT; LUMINESCENCE; FLUORESCENCE

categoria

Optics

autores

Neto, ANC; Moura, RT; Malta, OL

nossos autores

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