Recycling Y and Eu from Waste Fluorescent Powder and High Temperature Solid-State Synthesis of Y2O3:Eu Phosphors

Abstract

Y 2 O 3 :Eu were prepared through precursors synthesized by leaching tests, removing impurities, enrichment of Y and Eu from residual purified liquors, annealing treatment, and high temperature solid-state reaction method, which is the most suitable for large-scale production. The analysis of product shows that the purity is 99.42%. The resultant powders were characterized by X-ray diffraction (XRD), differential thermal analysis (TG-DTA), scanning electron microscope (SEM), and photoluminescence (PL). Compared with the commercial phosphors, the XRD spectrum of the product samples revealed the synthesized particles to have a pure cubic Y 2 O 3 :Eu structure without any impurities in the crystalline phase. On the morphology, the Y 2 O 3 :Eu particles synthesized by a combustion and high temperature solid state process with sintering aids, were large and uniform. For luminescence property, the emission intensity of Y 2 O 3 :Eu phosphors synthesized by combustion process and high temperature solid state process with sintering aids were higher than those without sintering aids, at 1400 • C.

Ultrasound‐Assisted Leaching of Vanadium and Yttrium from Coal Ash: Optimization, Kinetic and Thermodynamic Study

“…Then, H 2 O 2 was determined as a significant factor for a positive effect on Y extraction. Increasing H 2 O 2 improves the reaction activation energy, so the efficiency improves [29].…”

Hydrothermal method for Y2O3:Eu3+ uniform nanophosphors with different templates

“…7,8 Moreover, it presents many unique properties such as excellent chemical and physical stability, large band gap (∼5.6 eV) and high refractive index (>1.9) among others. 3,9 Europium-doped Y 2 O 3 , as an excellent red-emitting phosphor, has been successfully synthesized in various methods like sol-gel, 10 co-precipitation, 11 hydrothermal, 12 high temperature solid-state, 13 spray pyrolysis 14 and microwave method. 15 In these methods, the hydrothermal method has many advantages such as simple operation methods and equipment, relatively low reaction temperature, green and cheap reagent, high efficiency and low energy consumption.…”