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- W1664324943 abstract "Eu3+ and Tb3+− doped perovskite nanosheets, Gd2−xEuxTi3O102− and La1-xTbxTa2O7−, were prepared by the soft chemical exfoliation reaction of K2Gd2−xEuxTi3O10 and RbLa1-xTbxTa2O7 with an ethylamine solution. The thicknesses of the nanosheets were 2.4 nm (Gd1.4Eu0.6Ti3O102−) and 1.8 nm (La0.7Tb0.3Ta2O7−). This indicates that the starting layered oxides can be exfoliated by acid exchange and treatment with ethylamine. Intense red and green emission were observed in aqueous solution with Gd1.4Eu0.6Ti3O102−− and La0.7Tb0.3Ta2O7− -nanosheets, under UV illumination with energies greater than the corresponding host oxide band gap. This result indicates that photoluminescence of these nanosheets are assigned to energy transfer from the M-O (M: Ti and Ta) network to Ln3+ (Ln3+: Eu3+ and Tb3+) in the nanosheets. In addition, the excitation bands of the Gd1.4Eu0.6Ti3O102−-nanosheet were red-shifted with increasing concentration of the nanosheet solution. This means that broad excitation peaks of the Gd1.4Eu0.6Ti3O102−-nanosheet are not assigned to the charge transfer (CT) transition from O2− to Eu3+, but the energy transfer from the Ti-O network to Eu3+ in the nanosheet. The strong Eu3+ emission intensity of Gd1.4Eu0.6Ti3O102−-nanosheet is presumably due to a two step energy transfer cascade from the Ti-O network to Gd3+ and then to Eu3+." @default.
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- W1664324943 date "2009-02-01" @default.
- W1664324943 modified "2023-09-23" @default.
- W1664324943 title "Synthesis and luminescence properties of nanosheets derived from layered perovskite K2Gd2−xEuxTi3O10and RbLa1-xTbxTa2O7" @default.
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- W1664324943 doi "https://doi.org/10.1088/1757-8981/1/1/012004" @default.
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