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• W1495284387 abstract "Eu 3+ doped Mg 2 TiO 4 (2 at% of Eu) nanoparticles which are 5 to 10 nm in diameter are prepared by Pechini-type polymerized complex route followed with the calcination in the temperature range from 400°C to 700°C. Emission spectra display characteristic<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M1><mml:mmultiscripts><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>D</mml:mi></mml:mrow><mml:mrow><mml:mn mathvariant=normal>0</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:mmultiscripts><mml:mo>→</mml:mo><mml:msub><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant=normal>F</mml:mi></mml:mrow></mml:mmultiscripts></mml:mrow><mml:mrow><mml:mi>J</mml:mi></mml:mrow></mml:msub><mml:mo> </mml:mo><mml:mo> </mml:mo></mml:math>(<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M2><mml:mi>J</mml:mi><mml:mo>=</mml:mo><mml:mn>0</mml:mn></mml:math>, 1, 2, 3, and 4) spin forbidden f-f electronic transitions of the Eu 3+ ions with the most pronounced emission coming from<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M3><mml:mmultiscripts><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>D</mml:mi></mml:mrow><mml:mrow><mml:mn mathvariant=normal>0</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:mmultiscripts><mml:mo>→</mml:mo><mml:msub><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant=normal>F</mml:mi></mml:mrow></mml:mmultiscripts></mml:mrow><mml:mrow><mml:mi>2</mml:mi></mml:mrow></mml:msub><mml:mo> </mml:mo><mml:mo> </mml:mo></mml:math>transition and with the emission decays varying between 0.57 and 0.87 ms for samples prepared at different temperatures. Judd-Ofelt theoretical analysis of the emission spectra of Eu 3+ ions was performed, which allowed calculating radiative and nonradiative emission probabilities, Judd-Ofelt intensity parameters, and the quantum efficiency of the Eu 3+ emission in the Mg 2 TiO 4 nanoparticles. The analyses showed the existence of high asymmetry around the metal ion sites. Also, the largest quantum efficiency of emission of 58.5% is found in nanoparticles prepared at 600°C." @default.
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• W1495284387 date "2015-01-01" @default.
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• W1495284387 title "Analysis of Eu³⁺Emission from Mg₂TiO₄Nanoparticles by Judd-Ofelt Theory" @default.
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• W1495284387 doi "https://doi.org/10.1155/2015/736517" @default.
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