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Preparation and Characterization of Luminescent Material SrWO4: Eu3+

Author: LiFang
Tutor: ShaoZhongBao
School: Northeastern University
Course: Physical and chemical
Keywords: luminescent materials chemical precipitation SrWO4:Eu3+ high temperature-energy ball mill
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 32
Quote: 0
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Abstract


Synthesizing nanometer-materials of different morphology and structure; searching stable and reliable preparation method, exploiting the new material with excellent peculiarity, are the present study focuses. In this paper, chemical precipitation and high temperature-energy ball milling method are adopted to synthesize luminescent materials, and the phase, luminescent performance, appearance pattern, grain size and so on of the luminescent material were characterized by testing X-ray diffraction (XRD), emission spectra and scanning electron microscopy (SEM), finally comfirm the best preparation techniques.Chemical precipitation which is the most frequently selected are choosed to prepare the precursor. By controlling the pH value of solution, changing precipitation temperature, aging time, doped quantity of Eu3+prepared different precursor of SrWO4:Eu3+ luminescent material. The heat decopmosition of the precursor by curves of DSC-TGA, and the reasonable range of the sintering temperature of powder is confirmed. SrWO4:Eu3+ luminescent material is obtained through calcining the precursor by muffle or high temperature-energy ball mill, eventually the best preparation techniques are confirmed as those:the pH value is 7, precipitation temperature is 60℃, aging time is 1 h, doped quantity of Eu3+ is 25%, the calcination temperature by muffle is 950℃; The best preparation techniques by high temperature-energy ball milling are those:the ratio of ball and material is 10:1, the temperature of milling is 600℃, the time of milling is 1 h, the doped quantity of Eu3+ is 25%. The powder are prepared by high temperature-energy ball milling are purer, size is even small, has good dispersion propertity and luminescent performance.Experimental process compared the two differernt system, the results show:high temperature-energy ball milling method not only has simple technics, but also the chemical reaction could be taken place easily at low temperture, reduce the temperture which the reaction needs so much. High temperature-energy ball milling method can proctect environment, save enrgy, so should be applied widely.

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