Emission Properties of Ternary Complexes of Europium(III)- β-Diketone-Trioctylphosphine Oxide

抄録

The effect of the substituted aromatics in RCOCH₂COCF₃ (R: benzoyl, 4-chlorobenzoyl, 4-methoxybenzoyl, 3, 4, 5- trimethoxybenzoyl, 9-anthroyl) on the emission properties of tris(β-diketonato)bis(trioctylphosphine oxide) europium- (III) complexes was investigated. The relative intensities of the sharp luminescence of the ternary europium(III) complexes in hexane at 610nm occur in this order: 3, 4, 5- trimethoxybenzoyltrifluoroacetone(3, 4, 5-tmbtfa)>4- chlorobenzoyltrifluoroacetone (4-cbtfa)>4- methoxybenzoyltrifluoroacetone (4-mtbtfa)> benzoyltrifluoroacetone (btfa)>9- anthroyltrifluoroacetone (9-atfa). The Eu(9-atfa)₃(topo)₂ complex did not give the characteristic luminescence at 610nm, but did show a broad emission in the range from 400nm to 600nm. Also, the solvent effect on the luminescence quantum yield (Φ_L) of Eu(3, 4, 5-tmbtfa)₃(topo)₂ is described. The ternary complex shows the largest quantum yield in hexane, so the effect of the concentrations of Eu(3, 4, 5-tmbtfa)₃(topo)₂, free 3, 4, 5-tmbtfa and topo on the luminescence intensity, I_L or Φ_L values of Eu(3, 4, 5-tmbtfa)₃(topo)₂ in hexane could be investigated.