Thursday, 2 June 2016: 17:00
Aqua 311 B (Hilton San Diego Bayfront)
Physical properties of endohedral metallofullerenes can be tuned by changing the fullerene size as well as the metal atom(s) inside the fullerene cage. One of the most interesting characteristic properties of the metallofullerenes encapsulating lanthanide metal atoms is the near-infrared photoluminescence (NIR-PL) due to the f-f transition of M3+ (or M2+) in fullerene cages. Previously, we reported that (Er2C2)@C82 (III) has exhibited the strongest PL in isomer-separated Er2@C82 (I, II, III) and (Er2C2)@C82 (I, II, III) in CS2 solution [1]. The encapsulated C2 molecule enhances the PL intensity by increasing the efficiency of the energy transfer from the C82 cage to the encapsulated Er3+. In this talk, we will report the NIR-PL from Tm atom(s) in Tm metallofullerenes for the first time. The PL spectra and their intensities strongly depend on the electronic states of Tm ions and the fullerene cages. The detailed mechanisms will be discussed.
[1] Y. Ito, T. Okazaki, S. Okubo, M. Akachi, Y. Ohno, T. Mizutani, T. Nakamura, R. Kitaura, T. Sugai and H. Shinohara, ACS Nano, 1, 456-462 (2007).