Preparation, characterization and luminescence of Sm3+ or Eu3+ doped Sr2CeO4 by a modified sol-gel method
来源期刊：JOURNAL OF RARE EARTHS2010年第4期
论文作者：张春祥 史建设 杨绪杰 陆路德 汪信
文章页码：513 - 518
摘 要：Superfine Sr2CeO4:RE3+ （RE=Eu, Sm） phosphors were synthesized at relatively low temperature by a modified sol-gel method using nitrates as raw materials, ethylenediaminetetraacetic acid （EDTA） as complexing agent. Single phase phosphors could be obtained at calcination temperature above 800 °C and pH value higher than 6.4 of initial solution. The as-prepared powders consisted of uniform crotch-like grains. The preparation process was monitored by thermogravimetric and differential thermal analysis （TG-DTA） and Raman spectra. The obtained products were characterized by X-ray diffraction （XRD）, field emission scanning electron microscopy （FESEM）, energy dispersive spectroscopy （EDS） and photoluminescence. Photoluminescence study indicated that strong energy transfer occurred between Eu3+/Sm3+ and host. The Sr2CeO4:RE3+ emission could be tuned from blue to white and red light by varying the concentration of RE3+. The strong emission and controllable light color are suitable for applications in advanced lighting and displaying fields.
张春祥，史建设，杨绪杰，陆路德，汪信
Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, Nanjing University of Science and Technology
摘 要：Superfine Sr2CeO4:RE3+ （RE=Eu, Sm） phosphors were synthesized at relatively low temperature by a modified sol-gel method using nitrates as raw materials, ethylenediaminetetraacetic acid （EDTA） as complexing agent. Single phase phosphors could be obtained at calcination temperature above 800 °C and pH value higher than 6.4 of initial solution. The as-prepared powders consisted of uniform crotch-like grains. The preparation process was monitored by thermogravimetric and differential thermal analysis （TG-DTA） and Raman spectra. The obtained products were characterized by X-ray diffraction （XRD）, field emission scanning electron microscopy （FESEM）, energy dispersive spectroscopy （EDS） and photoluminescence. Photoluminescence study indicated that strong energy transfer occurred between Eu3+/Sm3+ and host. The Sr2CeO4:RE3+ emission could be tuned from blue to white and red light by varying the concentration of RE3+. The strong emission and controllable light color are suitable for applications in advanced lighting and displaying fields.
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