| http://www.w3.org/ns/prov#value | - FIG. 7 is a graph showing light emitting spectrum resulting from excitation by semiconductor laser (980 nm) of the fine particles containing a rare earth element, which are obtained by fixing the amount of erbium to be added to yttrium oxide at 1 atom %, while changing the amount of ytterbium to be added to 0 atom %, 1 atom %, 3 atom %, 5 atom % and 20 atom %, respectively.
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