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

Luminescent EuIII coordination polymers with rigid triangular spacer ligands are reported. The EuIII coordination 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 (Φ4f-4f =82 %, photosensitized energy transfer efficiency=78 %). The triboluminescence efficiency of EuIII coordination 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 EuIII coordination polymers are demonstrated for the first time.