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.
Highlights
White light emitting diode (WLED) is an emerging solid-state cold light source
The reaction process was followed by thin layer chromatography (TLC), and the developing solvent was a 1:1 mixture of cyclohexane and ethyl acetate reagent
We still prepared europium ternary complexes by the common synthesis method, and the samples were analyzed by thin layer chromatography after reflux for 2 hours, 4 hours, 6 hours, 7 hours and 8 hours respectively to study the effect of different reflux time on the reaction
Summary
White light emitting diode (WLED) is an emerging solid-state cold light source. Compared with the longdeveloped incandescent lamp and fluorescent lamps, it has the advantages of environmental protection, no radiation, high brightness, low power consumption, small mass, small size, good directionality, compact structure, long service life and fast response time, etc [1]. Under the excitation of UV, rare earth europium ions (Eu3+) can emit red fluorescence, which can be used to make red phosphor to prepare near-UV white LEDs [7,8,9,10]. Rich rare earth resources are stored in the vast territory of our country, which provides unique conditions for the development of white LEDs in China. In this experiment, we prepared europium ternary complexes with trivalent rare earth europium ion (Eu3+) as the central coordination ion, 2-thenoyltrifluoroacetone (TTA) as the first ligand and triphenylphosphine oxide (TPPO) as the second ligand under different conditions by changing the solvent type, reflux time and preparation method. The optimal conditions for this preparation reaction were derived from the thin layer chromatography (TLC) performance, yield and other factors
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
