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Luminescence of nano- and macrosized LaPO4:Ce,Tb excited by synchrotron radiation |
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| Authors: | V. Pankratov A.I. PopovA. Kotlov C. Feldmann |
| Affiliation: | a Institute of Solid State Physics, University of Latvia, 8 Kengaraga, LV-1063 Riga, Latvia b HASYLAB at DESY, Notkestrasse 85, D-22607 Hamburg, Germany c Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, D-76131 Karlsruhe, Germany |
| Abstract: | Comparing the luminescence properties of nanosized and macroscopic LaPO4:Ce,Tb powders are performed in wide spectral range using synchrotron radiation. In the present study, LaPO4:Ce,Tb nanopowder was produced by means of a microwave-induced synthesis in ionic liquids, whereas the bulk sample represents a commercial lamp phosphor. Emission and excitation of both, Ce3+ and Tb3+ luminescence, is observed to be different when comparing bulk and nanosized LaPO4:Ce,Tb. In particular, it was shown that the fine structure of the Ce3+ as well as the Tb3+ related emission is poorly resolved for the nanomaterial. It is suggested that the nanoparticles surface plays a key role regarding the perturbation of rare-earth ions and changes their luminescence properties. Furthermore, it is demonstrated that allowed f-d transitions on Tb3+ at high energy are significantly suppressed for nanosized LaPO4:Ce,Tb. Energy transfer is required to initiate Tb3+ emission even in the vacuum ultraviolet spectral range. |
| Keywords: | LaPO4 Ce3+ Tb3+ Nanocrystals Luminescence Synchrotron radiation |
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