Preparation and photophysical studies of [Ln(hfac)3DPEPO], Ln = Eu, Tb, Yb, Nd, Gd; interpretation of total photoluminescence quantum yields

Martina Congiu, Mohamed Alamiry, Omar Moudam, Serena Ciorba, Patricia R Richardson, Laurent Maron, Anita C Jones, Bryce S Richards, Neil Robertson

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Synthesis and photophysical characterisation of [Ln(hfac)(3)DPEPO] complexes (with Ln = Eu, Tb, Yb, Nd, Gd) has been carried out to investigate the factors responsible for the variation in total photoluminescence quantum yield within this family of emissive lanthanide complexes. Electronic absorption and emission spectroscopy, in conjunction with DFT calculations of the excited state of the Eu complex, elucidate the role of each ligand in the sensitisation of the lanthanide through the antenna effect. The X-ray crystal structure of [Gd(hfac)(3)DPEPO] has been determined and shows an 8-coordinate environment around the Gd and a ten-membered chelate ring involving the DPEPO ligand. Total photoluminescence quantum yields were measured to be 6%, 1% and 2% for Ln = Tb, Nd and Yb, respectively, in comparison with around 80% for Ln = Eu. The lower quantum yield for Nd and Yb, compared with Eu, can be attributed to more efficient quenching of the excited Ln state by high-energy oscillations within the ligands, whereas the lower quantum yield for Tb is assigned to a combination of poor energy transfer from the ligand excited state to the Tb and longer radiative lifetime.

Original languageEnglish
Pages (from-to)13537-13545
Number of pages9
JournalDalton Transactions
Volume42
Issue number37
DOIs
Publication statusPublished - 30 Jul 2013

Keywords

  • LUMINESCENT SOLAR CONCENTRATORS
  • CHEMISTRY-BASED INTERPRETATIONS
  • INTRAMOLECULAR ENERGY-TRANSFER
  • TRIPLET-STATE ENERGY
  • RARE-EARTH IONS
  • LANTHANIDES COMPLEXES
  • TERNARY COMPLEXES
  • LIGANDS
  • EMISSION
  • SERIES

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