Photophysical properties and energy transfer pathway of Er(III) complexes with Pt-porphyrin and terpyridine ligands

Min Kook Nah, Jae Buem Oh, Hwan Kyu Kim, Kyong Hoon Choi, Yong Rok Kim, Jun Gill Kang

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The photophysical properties of Er(III) complexes coordinated with platinum[5,10,15-triphenyl-20-(4-carboxyphenyO-porphyrin] (PtP) and terpyridine (tpy) ligands in organic solution were investigated. The Er-(III) complex emitted sensitized near-IR (NIR) luminescence when the PtP ligands were excited under deoxygenated conditions. The quantum yield (ΦLn) of the sensitized luminescence was 0.015%, as evaluated from luminescence lifetime. The photophysical studies and theoretical calculations suggest that the Förster resonance mechanism is very suitable for the energy transfer from PtP to the Er(III) ion and occurred through the first triplet excited state of PtP. The 12.3% energy transfer from the triplet state to the 4F 9/2 and 4I9/2 states of Er(III) occurred with a rate distribution of 3.36 × 105 and 6.67 × 10 4 s-1, respectively. In addition, the observed triplet quantum yield of the PtP ligand in [Ln(PtP)3(tpy)] proved that the energy transfer from the singlet excited state of the PtP ligand to the Er(III) ion did not take place.

Original languageEnglish
Pages (from-to)6157-6164
Number of pages8
JournalJournal of Physical Chemistry A
Issue number28
Publication statusPublished - 2007 Jul 19


All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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