Energy transfer from the 4S3/2 state of Cs2NaErxY1-xCl6

摘要

Luminescence decay curves have been measured from the $+4$/S$-3/2$/ excited state of erbium(III) in the elpasolite lattice for a range of concentrations and temperatures. Cross relaxation occurs from this state involving a relaxation at the donor to the $+4$/I$-9/2$/ state and a transition at the acceptor from the ground state to the $+4$/I$-13/2$/ state. The decay curves are strongly temperature dependent, the cross relaxation becoming important at 80 K and above. A comparison with the decay curves calculated using a shell model of discrete acceptor distribution within the lattice is unsuccessful due to migration of the excitation energy within the lattice.