Near-infrared emission from lanthanide complexes is usually realized by a sensitization process, in which energy from the excited state of a sensitizer transfers to the excited states of lanthanide ion, which emits in the NIR region when it relaxes to the ground state. It is of importance for ligands to have a high triplet yield to produce efficient near-infrared emission fro lanthanide ions. In this presentation, we will report synthesis and characterization of three ytterbium (III) complexes of 5, 15-diphenylporphyrinate ligands. Two Br and I atoms are introduced into the 5, 15-positions of the porphyrin ring to induce high triplet yields as well as to suppress the quenching from the nearby C-H vibration. The complexes can be effectively sensitized by a green light source producing a strong emission at 980 nm. The impact of halogenation on the quantum yields and emission lifetimes will be discussed.

Halogen atom effect on the near-infrared emission of porphyrinate ytterbium (III) complexes

2019 Spring National Meeting

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