Differences in Emission Properties for Triboluminescent EuD4TEA Synthesized Using Europium Nitrate or Europium Acetate

Europium tetrakis dibenzoylmethide triethylammonium (EuD4TEA) is one of the most intense triboluminescent (TL) materials currently known. It was recently reported that the triboluminescent yield was increased by 82% by changing the starting europium salt from europium chloride to europium nitrate. Unfortunately, europium nitrate has been classified as a hazardous material that cannot be shipped by air, which limits the availability of manufacturers and increases the cost. In an effort to further reduce the synthesis cost of EuD4TEA, we explore the effects of europium acetate on the triboluminescent properties of EuD4TEA by comparing the triboluminescent yield. The photoluminescent spectra as well as crystal structure using an optical microscope will also be explored.

The electronic properties of mixed valence hydrated europium chloride thin film

We investigate the electronic properties of a model mixed-valence hydrated chloride europium salt by means of high resolution photoemission spectroscopy (HRPES) and resonant photoemission spectroscopy (RESPES) at the Eu 3d → 4f and 4d → 4f transitions.

Recovery of Y and Eu from Waste Phosphors of CRT TVs and the Preparation of Yttrium Europium Oxide

Yttrium (Y) and Europium (Eu) were recovered from waste phosphors of TV screens via several processes, including roasting waste phosphors with ammonia chloride, dissolving yttrium chloride and europium chloride with water from roasted waste phosphors, purification with sodium sulfide, precipitating in the presence oxalic acid and calcining at high temperature. The optimal conditions for roasting was investigated, and it was found that when 1 g sample reacts with 8 g ammonia chloride, the recovery rate of Y and Eu can be 92.12% and 90.38% after 30min reaction at 90°C, respectively. Moreover, the optimal pH value for recovering Y and Eu was also investigated. It was found that at pH=1, the stoichiometric ratio of B/A (A: S2-, B: Zn2+, etc) is 1:1, the stoichiometric ratio of B/A (A: Y3+, B: C2O42-, etc) is 2:1, the content of Y and Eu can be reached 98.10% and 96.30%, respectively. And yttrium europium oxide was finally synthesized, which produce the red light when the excitation wavelength was 242 nm.

Synthesis and Luminescent Properties of Europium Chloride with DPA Complexes

In this paper, the solid-state reactions between EuCl3 and pyridine dicarboxylic acid (DPA) are studied. The complex is synthesized by one step solid state reaction at room temperature and the material was characterized by element analysis, fourier transform infrared (FTIR) spectra, absorption and fluorescence spectra. The compositions of complex has been confirmed to be [Eu (DPA)2(Cl)2]•6H2O. Organic light emitting diodes based on the structure of ITO/PEDOT:PSS/PVK:PSS/PVK:Eu/Bphen (12 nm)/LiF(1 nm)/Al were fabricated, the electroluminescence of Eu3+ complex was investigated under different driving voltage.

Sonochemical Preparation of Ternary Europium Complexes Eu(DBM)3•phen

Eu(DBM)3•phen complexes have been Successfully synthesized by the sonication of an Ethanol solution of europium chloride and dibenzoylmethanide (DBM) in the presence of 1,10-phenanthroline(phen). The properties of the Eu(DBM)3•phen complexes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform Infrared spectroscopy (FT-IR) and fluorescence spectrometry (FS). Reaction conditions, such as ultrasonic power and the concentration of complexing reagent, were found to have close relation with the morphologies of final products. The formation mechanism of Eu(DBM)3•phen complexes with ultrasonic irradiation is discussed in the context.