摘要(英) |
Coordination polymers, R2(CHDC)3, were synthesized using mid-temperature hydrothermal synthesis. The coordination center, R, is the trivalent rare earth elements: Yttrium (Y), Terbium (Tb), or Samarium (Sm) with different compositions, and the ligand is 1,4-cyclohexanedicarboxylate (C8H10O4, CHDC). Previous study found the emission decay curves of Sm3+ and Tb3+ are correlated with Sm3+ concentration, but no conclusion on the existence of Tb3+→ Sm3+ energy transfer. In this thesis, new emission spectra and emission decay curves of SmxTb2-x(CHDC)3 and YxSmyTb2-x-y(CHDC)3 are acquired at new excitation wavelength and experimental condition. Analysis and comparison of these spectroscopic data verify the Tb3+→ Sm3+ energy transfer. This energy transfer process is an upper state migration and its energy transfer efficiency is dependent of Tb3+- Tb3+ energy hopping. In addition, a new multiphoton energy transfer process was found in these coordination polymer compounds. |
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