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

摘要

Luminescent Eu~(III) coordination polymers with rigid triangular spacer ligands are reported. The Eu~(III) coordination polymer, [Eu_3(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~(III) 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 Eu~(III) coordination polymers are demonstrated for the first time.