Effective Photo- and Triboluminescent Europium(III) Coordination Polymers with Rigid Triangular Spacer Ligands

Article abstract of DOI:10.1002/chem.201605054

Luminescent Eu^IIIcoordination polymers with rigid triangular spacer ligands are reported. The Eu^IIIcoordination polymer, [Eu₃(hfa)₉(tppb)₂]_n(hfa: hexafluoroacetylacetonate, tppb: tris(4-diphenylphosphorylphenyl)benzene), shows high thermo-stability (decomposition temperature=354 °C) and photoluminescence quantum yield (Φ_4f–4f=82 %, photosensitized energy transfer efficiency=78 %). The triboluminescence efficiency of Eu^IIIcoordination polymer with triangular spacers under laser pulse irradiation (Nd:YAG, λ=1064 nm, pulse width=5 ns, pulse energy=0.1 mJ) is calculated to be 49 %. Characteristic triangular structure, high emission quantum yield, effective photosensitized energy transfer, and remarkable triboluminescence properties of Eu^IIIcoordination polymers are demonstrated for the first time.