The influence of the solution preparation method on the co-luminescence intensity of chelates of Eu(III) ions and estimation of the size of arising nanostructures

The luminescence intensity of Eu(III) ions (I ^Eu) in 3: 1 aqueous solutions of thenoyltrifluoroacetone, n-methoxybenzoylacetone, and dibenzoylmethane with 1,10-phenanthroline is studied in the presence and the absence of La(III), Gd(III), and Nd(III) ions. It is found that, in binary solutions of Eu(III) with La and Gd, the intensity I ^Eu, as well as the influence of chelates of La and Gd on I ^Eu, is considerably greater if these ions are introduced into the solutions of β-diketones and 1,10-phenanthroline simultaneously and homogeneously than when they are introduced into these solutions successively. This result is explained by the difference in the distribution of different Ln chelates over nanostructures. The average size of the structures arising is estimated.