Abstract
Luminescence decay curves from the 5D1 state of Eu3+in the cubic hexachloroelpasolite crystals Cs2NaSmxEu0.1Gd0.9−xCl6 have been investigated at 80 K. In this system the emission from the 5D1 state of Eu3+ is strongly quenched by cross relaxation to nearby Eu3+ ions and energy transfer to the 4G5/2 state of Sm3+. The decay curves are analysed in terms of a discrete shell model for competitive cross-relaxation and energy-transfer processes assuming electric dipole vibronic-electric dipole vibronic interactions between Eu3+ donor ions and Sm3+ acceptors. We demonstrate the properties of the shell model and the limitations involved in the modelling of luminescence decay curves.
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