Preparation And Fluorescence Properties Of Spherical Y ₂ 3 : Eu ^{3 +} Microwave Homogeneous Precipitation Method

Due to the special electron shell structure, rare earth elements widely applied in electrical, magnetic and optical field. As a vital commercial tricolor Pink, Y2O3:Eu+ has a nearly 100% quantum efficiency and excellent color purity and light attenuation characteristics, stable physical and chemical properties, has been widely used in fluorescent lamps, display backlighting and other fields. In addition, the Y2O3:Eu3+ adulterate with Ti3+ and Bi3+ can be used as a white LED with Pink, red to complement the missing ingredient. Y2O3:Eu3+adulterate with Dy3+ is a long afterglow phosphor with good afterglow performance, adulterate with Tb3+ can emit white light. This paper studies the Y2O3:Eu3+ adulterate with La3+ that not only reduces the cost, but also improves the Y2O3:Eu3+fluorescence properties.This article preparation of Y2O3:Eu3+and Y2O3:Eu3+adulterate with La3+ by microwave homogeneous precipitation.1. urea as precipitating agent, using microwave heating, prepared submicr on spherical particles (Y1-x-y,Lay)2O3:xEu3+ precursor by homogeneous precipit ation. Determining the optimal conditions of preparation:RE nitrate feed soluti on and the concentration of 0.04mol/L, microwave heating mode, RE feed s olution pH 7, compared with the value of R urea and rare earth ions material is 10.2. Preparation of Y2O3:Eu3+ precursors and then to study the effects of h eating temperature on the morphologies and fluorescence properties. The results showed that, the heating temperature between 900～1100℃ can get the excel lent morphology and submicron spherical particles. Products emission intensity i ncreases and then decline with temperature increase,1200℃, the temperature quenching effect occurs, that at this time product achieve optimal fluorescence performance. The luminous intensity of the product increases and then decline with the Eu3+ content, Eu3+ content of 7%, concentration quenching effect occ urs, that is, the fluorescence properties of the product to achieve optimal, color purity in line with GB/T14633-2010 standards.3. Preparation of Y2O3:Eu3+ adulterate with La3+ precursors and then to st udy the effects of heating rate, La3+ and Eu3+ content on the morphology and fluorescence properties of the product. The results showed that the heating rate is less than 20℃/min-1, the product morphology is excellent, higher than 20 ℃/min-1, the product appears reunion, the greater the speed, the more serious reunion. Heating rate and the luminous intensity of product is inversely propo rtional. When La3+=10%, Eu3+=3%, the concentration quenching effect occ urs, that is the maximum luminous intensity of the product, color purity is als o in line with GB/T14633-2010 standards.