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《Chinese Journal of Luminescence》 2004-02
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Preparation of SrAl_2O_4:Tb~(3+), Ce~(3+) Phosphor and Studies on Its Luminescent Properties

QIU Ke-hui;LI Jun-feng;GAO Xiao-ming;FU Mao-yuan Institute of Material Science and Technology,Chengdu University of Technology,Chengdu 610051,China  
SrAl_2O_4: Ce~(3+), Tb~(3+) phosphor was an important green luminescence materials. It had many excellent properties such as long persistence of phosphorescence, high quantum efficiency, good stableness and no radiation in the use and preparation. In this paper, the SrAl_2O_4: Ce~(3+), Tb~(3+) phosphor was synthesized by high temperature solid-state reaction at a weak reductive atmosphere. The synthesis of this kind of phosphor generally requires high temperature (i. e. 1350 ~ 1550℃) and reductive atmosphere which was made by the active carbon powder. The matrix composition, structures and luminescent properties of the phosphor could be affected under different synthesiz- ing conditions, such as calcination temperature, soaking time, temperature-lowering way etc. The samples had been characterized by X-ray diffraction(XRD) analysis, scanning electron microscopy(SEM) and fluorospectrophotometer. Based On the XRD peaks and, the powder phosphors were identified as SrAl_2O_4 phase, which was monoclinic (α=8.442 4 A, b=8.822 A, c=5.160 7 A, β=93.415°). The results proved that the phosphors synthesized at different temperature in this work were all α-SrAl_2O_4. Based on scanning electron photo micrograph, the grain sizes were increasingly amplified with the rise of the temperature synthesized. Excitation and emission spectrum of the SrAl_2O_4: Ce~(3+), SrAl_2O_4: Tb~(3+) and SrAl_2O_4: Ce~(3+), Tb~(3+) phosphors were tested by the fluo- rospectrophotometer. On the basis of analyzing the excitation and emission spectra, The results of the measurement indicated that after adding Ce~(3+) to the system of SrAl_2O_3: Tb~(3+) the luminescence intensity and afterglow time increases. So Ce~(3+) sensitized Tb~(3+) and passed energy to it.
【Fund】: 四川省应用基础资助项目(02GY029-007)
【CateGory Index】: TB34
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