Luminescence properties of Dy3+ doped Gd2O3 nanoparticles prepared by glycine route: annealing effect

作者：Shukla R; Ningthoujam R S^*; Tyagi A K; Vatsa R K

来源：International Journal of Nanotechnology, 2010, 7(9-12): 843-851.

• luminescence
• cross-relaxation
• lifetimes
• nanoparticles
• surface effect

Dy3+ doped Gd2O3 nanoparticles were prepared by glycine-nitrate combustion route and their luminescence properties have been investigated. Through host lattice absorption at 230 nm, emission peaks at 488 (4F(9/2) -> H-6(15/2), blue-green) and 572 nm (E-4(9/2) H-6(13/2), yellow) of Dy3+ arc observed along with a broad emission peak at 400 nm (host). Luminescence intensity increases with increase of heat-treatment from 500 degrees C to 900 degrees C due to extent of reduction of particle surface defect. On increasing the concentration from 1 to 2 at.% Dy3+, luminescence intensity increases slightly and decreases with further increase of Dy3+ due to cross-relaxation among Dy3+ ions. This was supported by lifetime studies. Lifetimes for F-4(9/2) level of Dy3+ in 1, 2 and 5 at.% Dy3+ doped Gd2O3 prepared at 900 degrees C were found to be 237, 39 and 26 mu s, respectively.

• 出版日期2010