Synthesis and Characterization of Eu³⁺ + 2-thenoyltrifluoroacetone + triphenylphosphine Oxide Ternary Complex

School of Science and Technology, Zhejiang International Studies University, Hangzhou, Zhejiang 310023, P. R. China

^* Corresponding author: yipingzhang@zisu.edu.cn

Abstract

Rare earth europium ion (Eu³⁺) can emit red characteristic fluorescence under UV excitation and is preferred for the preparation of red phosphors for near-UV white LEDs. In this paper, the effects of solvent, reflux time and preparation method on the preparation of europium ternary complexes were studied with europium ion as the central coordination ion, 2-thenoyltrifluoroacetone as the first ligand and triphenylphosphine oxide as the second ligand. The results showed that the better reaction solvent was anhydrous ethanol and the better reflux time was 8 hours. Both the common synthesis method and the solvothermal method could successfully synthesize the europium ternary complex, and the solvothermal method has a higher yield. The europium ternary complex was characterized by inductively coupled plasma emission spectroscopy, element analysis and infrared spectroscopy, and it was proved that the europium complex could emit a strong characteristic red fluorescence of europium with the structure of Eu(TTA)₃(TPPO)₂ in 1:3:2 coordination ratio.