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《Materials Review》 2007-S2
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The Influence of Different Fluxes in Rapid Synthesis of the Red Phosphor La_2O_2S:Eu by the Microwave Radiation Method

ZHAI Yongqing,LIU Yuanhong,ZHOU Xueling, ZHANG Xiaoyuan, WANG Wenpin (College of Chemistry and Environmental Science, Hebei University, Baoding 071002)  
La2O2S:Eu, red phosphor is rapidly synthesized in a microwave field. The synthesized phosphors are investigated respectively by XRD, SEM and Fluorescence spectrophotometer. The influences of several fluxes of Li2CO3, Na2CO3, K2CO3, Na3PO4, (NH4)2CO3, Na2C2O4 and NaCl on the structure, micrograph and luminescent properties of La2O2S:Eu phosphor are studied. The results indicate that single phase La2O2S:Eu could be obtained by adding different fluxes, except Na3PO4. La2O2S:Eu phosphors possess hexagonal crystal structure, which is similar to that of La2O2S. The grain size and micrograph of the samples are different with different fluxes. Emission spectrums show that the intensity of emission peak at 627 nm depends greatly on the added flux, but their shape and position are similar. In the excitation spectnims,not only the intensity of main peak but also its position are affected by the added flux.
【Fund】: 河北省教育厅博士基金资助项目(B2004205);; 河北省科学技术研究与发展计划项目(06213015);; 河北大学研究基金资助项目(y2004024)
【CateGory Index】: TB34
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