| Autor: |
Tegze B; Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, H-1111, Műegyetem rkp. 3., Budapest, Hungary. horvolgyi.zoltan@vbk.bme.hu., Tolnai G; Holikem Kft, H-1082, Kisfaludy utca 40, Budapest, Hungary., Albert E; Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, H-1111, Műegyetem rkp. 3., Budapest, Hungary. horvolgyi.zoltan@vbk.bme.hu., Hessz D; Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, H-1111, Műegyetem rkp. 3., Budapest, Hungary. horvolgyi.zoltan@vbk.bme.hu.; MTA-BME Lendület Quantum Chemistry Research Group, Műegyetem rkp. 3., H-1111 Budapest, Hungary., Kubinyi M; Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, H-1111, Műegyetem rkp. 3., Budapest, Hungary. horvolgyi.zoltan@vbk.bme.hu., Madarász J; Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, H-1111, Műegyetem rkp. 3., Budapest, Hungary., May Z; HUN-REN Research Centre for Natural Sciences, Institute of Materials and Environmental Chemistry, H-1117 Magyar tudósok körútja 2., Budapest, Hungary., Olasz D; Institute for Technical Physics and Materials Science, HUN-REN Centre for Energy Research, Konkoly-Thege M. út 29-33, H-1121, Budapest, Hungary.; Department of Materials Physics, Eötvös Loránd University, Pázmány Péter sétány 1/A, H-1117, Budapest, Hungary., Sáfrán G; Institute for Technical Physics and Materials Science, HUN-REN Centre for Energy Research, Konkoly-Thege M. út 29-33, H-1121, Budapest, Hungary., Hórvölgyi Z; Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, H-1111, Műegyetem rkp. 3., Budapest, Hungary. horvolgyi.zoltan@vbk.bme.hu. |
| Abstrakt: |
LaF 3 :1-6 mol%Yb 3+ ,0.1 mol%Tm 3+ nanoparticles with upconversion properties were synthesised by the co-precipitation method. Particles were characterized by transmission electron microscopy coupled with energy-dispersive spectrometry, inductively coupled plasma optical emission spectrometry, X-ray diffraction, and simultaneous thermogravimetry and differential thermal analysis. Upconversion properties were investigated by fluorescence spectroscopy, using 980 nm laser light excitation. The results show that the particles had a hexagonal LaF 3 crystal structure. Crystallite and particle sizes decreased with increasing Yb 3+ content and the average crystallite size changed between 18 and 36 nm, while the average particle diameter was 25-52 nm. The highest upconversion emission intensity at the 480 nm emission peak could be reached with an optimal Yb 3+ content of 3 mol% and an Yb/Tm ratio of ∼75. These upconverting nanoparticles, prepared using a cheap and environmentally friendly co-precipitation method and containing relatively low dopant ion concentrations, will be helpful in a variety of promising fields, such as sensing, solar cells and security applications. |
