Facile Synthesis of Mn4+-Activated Double Perovskite Germanate Phosphors with Near-Infrared Persistent Luminescence

被引:30
作者
Du, Jiaren [1 ,2 ]
Poelman, Dirk [1 ,2 ]
机构
[1] Univ Ghent, Dept Solid State Sci, LumiLab, Krijgslaan 281-S1, B-9000 Ghent, Belgium
[2] Univ Ghent, Ctr Nano & Biophoton NB Photon, B-9000 Ghent, Belgium
关键词
near-infrared emission; persistent luminescence; double perovskite; La2MgGeO6; RECENT PROGRESS; NANOPROBES; LAALO3MN4+; MN4+; LEDS; DY;
D O I
10.3390/nano9121759
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Tetravalent manganese doped phosphors are emerging as a new class of efficient near-infrared emitters for applications in a variety of areas, such as bioimaging and night-vision surveillance. Novel double perovskite-type La2MgGeO6:Mn4+ phosphors were successfully prepared using a microwave-assisted energy-saving solid state method. This simple technique involving the use of a microwave susceptor allows for a reduction of the preparation time compared to a conventional solid state reaction. The samples were investigated using powder X-ray diffraction, scanning electron microscopy, as well as energy-dispersive X-ray spectroscopy mapping, photoluminescence excitation/emission spectroscopy, persistent luminescence decay and temperature-dependent photoluminescence analysis. Substitution between isovalent Mn4+ and Ge4+ can be achieved without additional charge compensators in this germanate-based phosphor, which provides strong emission in the near-infrared spectral region, assigned to the characteristic transitions of tetravalent manganese ions. Additionally, the double perovskite-type germanate phosphor exhibits excellent luminescence thermal stability. Moreover, the spectroscopic properties, excitation wavelength-dependent and temperature-dependent persistent luminescence were studied. A series of thermoluminescence measurements were presented trying to give clear information on the charging process, afterglow behavior and the nature of the traps responsible for the persistent luminescence. The present investigation expands the range of available promising near-infrared emitting persistent phosphors for medical imaging.
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页数:18
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