Luminescence studies on lanthanide ions (Eu, Dy and Tb) doped YAG:Ce nano-phosphors
نویسندگان
چکیده
Yttrium aluminum garnet nanoparticles both undoped and doped with lanthanide ions (Ce, Eu, Dy and Tb) having average size around 30 (73nm) nm were prepared by glycine nitrate combustion method followed by annealing at a relatively low temperature of 800 1C. Increase in the annealing temperature has been found to improve the luminescence intensity and for 1200 1C heated samples there exists strong energy transfer from Tb to Ce ions in YAG:Ce(2%),Tb(2%) nanoparticles as revealed by luminescence studies. Co-doping the YAG:Ce nanoparticles with Eu results in significant decrease in the emission intensity of both Ce and Eu ions and this has been attributed to the oxidation of Ce to Ce and reduction of Eu to Eu ions. Dy co-doping did not have any effect on the Ce emission as there is no energy transfer between Dy and Ce ions. & 2008 Elsevier B.V. All rights reserved.
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