Characterization of ternary coordination complex of europium with thenoyltrifluoroacetone and triphenylphosphine oxide in situ synthesized in ORMOSIL

By using the in situ synthesis technique, the complex of europium with then oyltrifluoroacetone. (TTA) and triphenylphosphine oxide (TPPO) was confirme d to synthesize in the transparent monolithic ORMOSIL during heat treatment by IR and photoluminescence spectra. The ORMOSIL doped with the EuTFA-TPPO in situ complex appears to have rather high luminescence intensity and rel ative intensity ratio of D-5(0)--> F-7(2)/D-5(0)--> F-7(1), i.e., better mo nochromaticity. The emission intensity of the Eu3+ ions in the ORMOSIL heat ed at 100 degreesC for 24 h increases by a factor of about 1400 compared to that in the no heat treatment sample. Laser excited high-resolution spectr a indicate that the molecular structure of the Eu-TTA-TPPO in situ complex is similar to that of the Eu(TTA)(3)(TPPO)(2) complex. The effective site s ymmetry of the Eu3+ ion in the Eu-TTA-TPPO in situ complex as well as in th e Eu(TTA)(3)(TPPO)(2) complex may be C-1 or C-2 or C-S. It is reasonable to suggest that the Bu-TTA-TPPO in situ complex may be Eu(TTA)(3)(TPPO)(2). ( C) 2001 Elsevier Science Ltd. All rights reserved.