Luminescence properties of zirconia nanocrystals prepared by solar physical vapor deposition |
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| Affiliation: | 1. Institute of Solid State Physics, University of Latvia, Riga, Latvia;2. Institute of Inorganic Chemistry, Riga Technical University, Latvia;3. Procédés, Matériaux et Energie Solaire CNRS, France;1. Solid State Physics Department, National Research Center, 12622 Dokki, Cairo, Egypt;2. Department of Physics, Faculty of Science (Girls), Al-Azhar University, 11753 Nasr City, Cairo, Egypt;1. Instituto de Fisica, Universidade Federal de Uberlandia, CEP38408-902 Uberlandia, Minas Gerais, Brazil;2. CIMAP – Centre de recherche sur les Ions, les Matériaux et la Photonique UMR 6252 CEA-CNRS-ENSICAEN-Université de Caen, 14050 CAEN Cedex 4, France;3. Instituto de Física de São Carlos, Universidade de São Paulo, USP, CEP 13560-970 São Carlos, SP, Brazil;1. Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education, Taiyuan 030024, Shanxi, PR China;2. Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, Shanxi, PR China;3. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, PR China;4. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, PR China;1. Institute of Physics, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland;2. Belarusian State University of Informatics and Radioelectronics, P. Browki Str. 6, 220013 Minsk, Belarus |
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| Abstract: | Zirconia nanocrystals have attracted considerable interest as biolabels, which can be used as probes for medical imaging and biosensor applications. However, zirconia particle agglomeration forms a major limitation to its use for biolabeling. In this backdrop, for the first time, well-separated zirconia nanocrystals were obtained in a Heliotron reactor (PROMES CNRS, France) via the solar physical vapor deposition (SPVD) method. As the raw material target for solar evaporation, zirconia nanopowders obtained via the sol–gel process were used. The luminescence and upconversion luminescence properties of the Sol Gel nanopowders were compared with those of the SPVD nanocrystals. Erbium was chosen as the luminescence center with ytterbium as the sensitizer, and along with these two dopants, niobium was also used. Niobium acts as a charge compensator to compensate for depletion in the charge due to the introduction of trivalent erbium and ytterbium at tetravalent zirconium sites. Consequently, the oxygen-vacancy concentration is reduced, and this results in a significant increase in the upconversion luminescence.The SPVD-prepared samples showed less agglomeration and a fine crystal structure as well as high luminescence, and thus, such samples can be of great interest for biolabeling applications. |
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| Keywords: | Zirconia Upconversion luminescence Biolabeling Nanocrystals |
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