期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 19, 期 16, 页码 2316-2322出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b819287a
关键词
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资金
- NSFC [20773132, 20671092, 20771101, 20831004]
- National basic research program of China [2009CB93980]
- Directional program of CAS [KJCXZ-YW-M05]
The optimum luminescence and its relevant applications of phosphors are always challenged by the generation of multicolour lights in a single solid with a single-wavelength excitation. In this work, we initiated the preparation of novel core-shell CaWO4 microspheres co-doped with Na+ and Ln(3+) (Ln Tb, Sm, Dy, Eu) and systematically studied their tunable wavelength lights. The core and shell of the microspheres are based on the same materials that crystallized in a tetragonal scheelite structure. The primary particle size for the un-doped microspheres was about 36 nm, while upon doping with Ln(3+)/ Na+, the primary particle became as small as 14-19 nm. This core-shell structure is proved unique in significantly suppressing the energy-loss processes occurring at the nanoparticle surfaces. As a consequence, the un-doped microspheres exhibited an intense blue luminescence with a lifetime of 8.46 mu s and a chromaticity coordinate of (0.16, 0.14), while with increasing the Ln(3+) concentration, the blue emission disappeared and the emissions belonging to Ln(3+) were significantly enhanced as is followed by an apparent variation of the chromaticity coordinates. By simply varying the dopant concentration of Ln(3+), tunable wavelength lights were successfully achieved in the core-shell CaWO4 microspheres using a single-wavelength excitation light, which is a consequence of the modulated relative intensity of the WO42- emission and Ln(3+) emission.
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