Dysprosium-Yttrium-benzoate solid complexes

(Dy

1-x

Y

x

)

L

3

have been synthesized with homophase precipitation method in aqueous solution. Their luminescence properties and the influence of concentration of Y

3+

ions added on luminescence intensity of the complexes were studied. According to the IR absorption spectra of (Dy

1-x

Y

x

)

L

3

and the results investigated by Taylor to the structure of anhydrous rare earth ben-zoates

the supposed coordination structure for the complexes is as followThe emission spectra of Eu

L

3

Dy

L

3

and (Dy

1-x

Y

x

)

L

3

show that Dy

3+

ion in rare earth benzoate occupies the similar site of Eu

3+

ion which is not a centre of symmetry in benzoate.Because the occurrence of concentration quenching with higher concentration of Dy

3+

ions

the f→f transition for Dy

3+

ion in pure Dy

L

3

is very weak. It was found in experiments that if Y

3+

ions as a reactent were added in synthetic process of Dy

L

3

the luminescence intensity of Dy

3+

ions could be substantialy enhanced and was obtained with satisfactory result when the substitution of 85 mole% Dy

3+

for Y

3+

ions. The energy transfer between benzoic group and Dy

3+

ion through the excitation and emission spectra of NH

4

L

and complexes the absorption spectra of Dy

L

3

as well as the quenching of TTA to the Dy

3+

ions emission were observed.The luminescence of physical mixture of Dy

L

3

with YL3 in any propotion is weaker than the pure Dy

L

3

. Only the doped Y

3+

ions in a way of common precipitation can raise the omission intensity of Dy

3+

ions. From this fact

it may be supposed that (Dy

1-x

Y

x

)

L

3

is a kind of solid solution

besides the dilution to Dy

3+

ions

and the Y

L

3

"should play a role of intermolecular transfer of energy in the complexes. The

Y

/

B

ratio of Dy

3+

ions in aqueous complexes is greater than that in anhydrous complexes.The Y/B ratio of Dy

3+

ions in anhydrous complexes is not changed with the change of the concentration of Dy

3+

ions.