Preparation And Characterization Of Luminescent Material BaMoO₄:Eu³⁺

Because of the special electronic shell structure, the rare earth-doped luminescence materials have been provided with outstanding luminescence properties than the other type luminescence materials. Owning to the properties of high brightness, long afterglow, adjustable wavelength scale and non-radiation substance, more and more attention is paid to the studies of rare earth ion activated luminescence material, but for quite some time, the red luminescent materials have been a weakness in luminescent materials research, thus it is becoming a lot of scholar’s goal to find out a red luminescent material which has high luminosity and is stable. In this paper, chemical precipitation and high energy ball milling method were adopted to synthesize red luminescent materials powder (BaMoO4:Eu3+), and some research and discussion have been done in its best preparation techniques.The precursors were synthesized by using chemical precipitation method and choosing ammonium molybdate, barium nitrate and europium oxide as raw materials. According to the DSC-TG curves, the hot decomposition of precursor was determined, and the reasonable calcinations temperature of powder was made. Different BaMoO4:Eu3+powders were prepared by controlling the pH value of solution, precipitation temperature, the aging time, the calcinations temperature, pre-firing temperature and the concentration of Eu3+doped. The BaMoO4:Eu3+powder was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and emission spectra. Experimental results show that the best preparation techniques of BaMoO4:Eu3+powder were pH value for6, precipitation temperature for80℃, aging time for1h, calcinations temperature for1000℃, heat preservation time for2h and concentration of Eu3+doped for8%mol. The results show that the powder has small doping amount of Eu+, size is large, and has good luminescent performance.The BaMoO4:Eu3+powder was prepared by using high energy ball milling(HEBM) and choosing ammonium molybdate, barium carbonate and europium oxide as raw materials. Different BaMoO4:Eu3+powders were synthesized by changing the ball milling temperature, the ball milling time, ball-to-powder weight ratio and the concentration of Eu3+doped. The BaMoO4:Eu3+powder was characterized by X-ray diffraction, scanning electron microscopy and emission spectra. Experimental results show that the best preparation techniques of BaMoO4:Eu3+powder were ball milling temperature for600℃, ball milling time for3h, ball-to-powder weight ratio for20:1and concentration of Eu3+doped for12%mol. The results show that the powder has large doping amount of Eu3+, size is small, has good dispersion propertity and luminescent performance.We can get a conclusion from the above two experiments, compared with the traditional chemical precipitation method, adopting high energy ball milling not only can synthesize BaMoO4:Eu3+powder with simple preparation techniques and in a lower temperature, but also the powder are prepared by high energy ball milling are purer, size is even small, has good dispersion prosperity and luminescent performance. The means of preparing nano-sized rare earth phosphors by high energy ball milling has broadened the application areas and developed the method or measure of the research on the nano-sized rare earth phosphors.