Critical view on energy transfer, site symmetry, improvement in luminescence of Eu3+, Dy3+ doped YVO4 by core-shell formation
作者： L Robindro Singh , RS Ningthoujam , None
DOI: 10.1063/1.3373409
关键词:
摘要: Nanoparticles of Dy3+ and Eu3+ doped YVO4 (core) have been prepared by urea-hydrolysis in ethylene glycol medium further heated at 500 900 °C to grow particles as well remove unwanted hydrocarbon/H2O, which acts quencher luminescence. Samples show emission peaks 488 (blue), 537 (green), 572 (yellow), 592 (orange), 617 nm (red). The intensity decreases when excitation wavelength changes from 300 [V–O charge transfer band (CTB)] 255 (Eu/Dy–O CTB) then 355/395 (direct excitations Dy3+/Eu3+). This is attributed energy V–O Eu3+/Dy3+, Eu/Dy–O Eu3+/Dy3+. Energy more than that Dy3+. With heat-treatment temperature increases 900 °C, improved due the extent decrease nonraditive transition probability arising surface. To best authors’ knowledge, local/site symmetry same host not detail discussed literature. In h...
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