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  • Theoretical manifestation of the shell model for energy transfer
    Luxbacher, Thomas ; Fritzer, Harald Paulson ; Flint, Colin D.
    Luminescence decay curves for the 4G5/2-->6H7/2 emission of Sm3+ in the hexachloroelpasolite crystals Cs2NaSm0.01Gd0.99Cl6 and Cs2NaSm0.01Eu0.1Y0.89Cl6 have been measured over the temperature range ... 10-300 K using pulsed laser excitation into the magnetic-dipole allowed 6H5/2-->4G5/2 electronic transition of Sm3+. The emission is quenched by cross relaxation to nearby Sm3+ ions and energy transfer to the 5D0 state of Eu3+ acceptors and the decay curves are analyzed using a recently developed shell model for energy transfer. The corresponding energy-transfer rate to a single Eu3+ acceptor at a distance R1=7.65 Å shows a rapid increase in the temperature range 200-300 K which is explained in terms of the thermal population of the initial Sm3+(4G5/2)7 donor state and the Eu3+(7F1)4 acceptor state. The near-resonant magnetic dipole-magnetic dipole contribution to the total energy-transfer rate between a Sm3+ donor ion and a nearest-neighbour Eu3+ acceptor is calculated. We show the applicability of the shell model for the simultaneous treatment of cross-relaxation and energy-transfer processes to the 4G5/2 decay kinetics of Sm3+ in a cubic lattice.
    Source: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy. - ISSN 1386-1425 (Vol. 54, iss. 13, nov. 1998, str. 2099-2103)
    Type of material - article, component part ; adult, serious
    Publish date - 1998
    Language - english
    COBISS.SI-ID - 96767745
    DOI

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