Albrecht Winnacker, Roger M. Macfarlane, et al.
Applied Optics
Erbium ions encapsulated in the metallofullerene Er2@C82 emit near infrared fluorescence about 1.5 μm, typical for 4I13/2 → 4I15/2 transitions of Er3+. The similarity of spectra measured in glassy and polycrystalline media at 1.6 K, and the very narrow inhomogeneous linewidth (< 1cm-1), show that the fullerene cage provides a locally ordered environment for the two erbium ions, well isolated from the host medium. Spectral fine-structure is observed with line splittings of ˜10cm-1. It is proposed that these splittings are dominated by exchange interaction between the two Er3+ ions involving a novel superexchange pathway through the C82 cage. © 1997 The American Physical Society.
Albrecht Winnacker, Roger M. Macfarlane, et al.
Applied Optics
Roger M. Macfarlane
Journal of Luminescence
Thomas Böttger, C.W. Thiel, et al.
Journal of Luminescence
Ileana G. Rau, Susanne Baumann, et al.
Science