Luminescence studies on lanthanide ions (Eu, Dy and Tb) doped YAG:Ce nano-phosphors |
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Authors: | S Mukherjee |
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Institution: | Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India |
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Abstract: | Yttrium aluminum garnet nanoparticles both undoped and doped with lanthanide ions (Ce3+, Eu3+, Dy3+ and Tb3+) having average size around 30 (±3 nm) nm were prepared by glycine nitrate combustion method followed by annealing at a relatively low temperature of 800 °C. Increase in the annealing temperature has been found to improve the luminescence intensity and for 1200 °C heated samples there exists strong energy transfer from Tb3+ to Ce3+ ions in YAG:Ce(2%),Tb(2%) nanoparticles as revealed by luminescence studies. Co-doping the YAG:Ce nanoparticles with Eu3+ results in significant decrease in the emission intensity of both Ce3+ and Eu3+ ions and this has been attributed to the oxidation of Ce3+ to Ce4+ and reduction of Eu3+ to Eu2+ ions. Dy3+ co-doping did not have any effect on the Ce3+ emission as there is no energy transfer between Dy3+ and Ce3+ ions. |
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Keywords: | Garnet Phophors Nanoparticles |
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