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Issue 9, 2011
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Microwave-hydrothermally synthesized (Sr1−x−yCexTby)Si2O2−δN2+μ phosphors: efficient energy transfer, structural refinement and photoluminescence properties

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Abstract

A facile microwave-assisted hydrothermal method was developed to prepare oxynitride-based (Sr1−x−yCexTby)Si2O2−δN2+μ phosphors. The microwave-assisted hydrothermal process led to lower synthesis temperatures and shortened heating duration. The obtained powders exhibited a narrow size distribution. The Rietveld refinement reveals the obtained phosphors to have a triclinic crystal system. For Ce3+ doped SrSi2O2N2 phosphors, the emission spectrum exhibited an asymmetric band at 447 nm (λex = 322 nm), corresponding to the blue hue. As Ce3+ and Tb3+ ions were co-doped into SrSi2O2N2, the energy transfer occurred via a dipole–dipole interaction.

With increasing the Tb3+ concentration, the Tb3+ emission intensity enhanced and reached a maximum with the Tb3+ concentration of 2 mol%, then decreased due to the concentration quenching effect. It is also observed that the intensity of the Ce3+ emission peak decreased gradually. This indicates the effective energy transfer from Ce3+ to Tb3+ ions. The CIE coordinate of (Sr1−x−yCexTby)Si2O2−δN2+μ phosphors shifted from the blue region towards the green region with increasing Tb3+ concentration. The above findings indicate that the emitting colors of the microwave-hydrothermally derived (Sr1−x−yCexTby)Si2O2−δN2+μ phosphors can be tuned over a wide range under UV excitation.

Graphical abstract: Microwave-hydrothermally synthesized (Sr1−x−yCexTby)Si2O2−δN2+μ phosphors: efficient energy transfer, structural refinement and photoluminescence properties

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Publication details

The article was received on 02 Aug 2010, accepted on 22 Nov 2010 and first published on 13 Jan 2011


Article type: Paper
DOI: 10.1039/C0JM02501A
Citation: J. Mater. Chem., 2011,21, 2932-2939
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    Microwave-hydrothermally synthesized (Sr1−x−yCexTby)Si2O2−δN2+μ phosphors: efficient energy transfer, structural refinement and photoluminescence properties

    C. Hsu and C. Lu, J. Mater. Chem., 2011, 21, 2932
    DOI: 10.1039/C0JM02501A

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