Configuration-selective spectroscopic studies of Er3+ centers in ErSc2N@C80 and Er2ScN@C80 fullerenes

Tiwari, Archana; Dantelle, Geraldine; Porfyrakis, Kyriakos; Taylor, Robert A.; Watt, Andrew A. R.; Ardavan, Arzhang; Briggs, G. Andrew D.
November 2007
Journal of Chemical Physics;11/21/2007, Vol. 127 Issue 19, p194104
Academic Journal
Low temperature photoluminescence (PL) and photoluminescence excitation (PLE) spectroscopy of high purity ErSc2N@C80 and Er2ScN@C80 fullerenes reveal at least two metastable configurations of the Er3+ ion within the cage, consistent with previous observations from x-ray diffraction. Using PLE measurements at a number of different emission wavelengths we have characterized the ground state, 4I15/2, and the first excited state, 4I13/2, of the various Er3+ configurations and their crystal-field splitting. We present detailed energy level diagrams for the ground and excited states of the two dominant configurations of ErSc2N@C80 and Er2ScN@C80.


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