Temperature-dependent luminescent properties of Eu-Tb complexes synthesized in situ in gel glass

摘要

The chelates of europium and terbium with hexafluoroacetylacetone (HFA) and triphenylphoshine oxide (TPPO), Eu/Tb(HFA)_3(TPPO)_2, have been synthesized in situ in gel glasses with various concentrations of Eu~(3+) and Tb~(3+) ions. The photoluminescence spectra have been measured and the characteristic transitions of Tb~(3+) and Eu~(3+) have been observed. Due to the variance of energy transfer efficiencies from Tb~(3+) to Eu~(3+), the intensity ratios of europium luminescent band to terbium band vary remarkably with measurement temperatures. In addition, the Foerster mechanism has been proved to be responsible for the energy transfer between Eu~(3+) and Tb~(3+). The materials doped with Eu/Tb(HFA)_3(TPPO)_2 are promising for being used as a temperature detector and thermal-sensitive probe of optical fiber sensor.