Enhanced 1520 nm Photoluminescence from Er3+ Ions in Di-erbium-carbide Metallofullerenes (Er2C2)@C82 (Isomers I, II, and III)

详细信息    查看全文

• 作者：Yasuhiro Ito ; Toshiya Okazaki ; Shingo Okubo ; Masahiro Akachi ; Yutaka Ohno ; Takashi Mizutani ; Tetsuya Nakamura ; Ryo Kitaura ; Toshiki Sugai ; Hisanori Shinohara
• 刊名：ACS Nano
• 出版年：2007
• 出版时间：December 2007
• 年：2007
• 卷：1
• 期：5
• 页码：456-462
• 全文大小：304K
• 年卷期：0
• ISSN：1936-086X

文摘

Di-erbium and di-erbium-carbide endohedral metallofullerenes with a C₈₂ 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 (Er₂C₂)@C₈₂ (I, II, III) metallofullerenes are characterized by comparison with the UV–vis−NIR absorption spectra of (Y₂C₂)@C₈₂ (I, II, III), where molecular symmetries of the structures are determined to be C_s, C_2v and C_3v, respectively. Furthermore, enhanced near-infrared photoluminescence (PL) at 1520 nm from Er³⁺ ions in Er₂@C₈₂ (I, III) and (Er₂C₂)@C₈₂ (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)@C₈₂ (III) has been the strongest among the isomers of Er₂@C₈₂ and (Er₂C₂)@C₈₂. Optical measurements indicate that the PL properties of Er₂@C₈₂ (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.