Enhanced 1520 nm photoluminescence from Er3+ Ions in di-erbium-carbide metallofullerenes (Er2C2)@C82 (Isomers I, II, and III)

Yasuhiro Ito, Toshiya Okazaki, Shingo Okubo, Masahiro Akachi, Yutaka Ohno, Takashi Mizutani, Tetsuya Nakamura, Ryo Kitaura, Toshiki Sugai, Hisanori Shinohara

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56 Citations (Scopus)


Di-erbium and di-erbium-carbide endohedral metallofullerenes with a C 82 cage such as Er2@C82 (isomers I, II, and III) and (Er2C2)@C82 (isomers I, II, and III) have been synthesized and chromatographically isolated (99%). The structures of Er2@C82 (I, II, III) and (Er2C 2)@C82 (I, II, III) metallofullerenes are characterized by comparison with the UV-vis-NIR absorption spectra of (Y2C 2)@C82 (I, II, III), where molecular symmetries of the structures are determined to be Cs, C2v and C 3v, respectively. Furthermore, enhanced near-infrared photoluminescence (PL) at 1520 nm from Er3+ ions in Er 2@C82 (I, III) and (Er2C2)@C 82 (I, III) have been observed at room temperature. The PL intensities have been shown to depend on the symmetry of the C82 cage. In particular, the PL intensity of (Er2C2)@C 82 (III) has been the strongest among the isomers of Er 2@C82 and (Er2C2)@C82. Optical measurements indicate that the PL properties of Er2@C 82 (I, II, III) and (Er2C2)@C82 (I, II, III) correlate strongly with the absorbance at 1520 nm and the HOMO-LUMO energy gap of the C82 cage.

Original languageEnglish
Pages (from-to)456-462
Number of pages7
JournalACS Nano
Issue number5
Publication statusPublished - 2007 Dec
Externally publishedYes


  • Erbium
  • Metal-carbide endohedral fullerene
  • Metallofullerene
  • Photoluminescence

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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