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Up-conversion luminescence in Yb(3+)-Er(3+)Tm(3+) co-doped Al(2)O(3)-TiO(2) nano-composites.
Mokoena, Teboho Patrick; Linganiso, Ella Cebisa; Kumar, Vinod; Swart, Hendrik C; Cho, So-Hye; Ntwaeaborwa, Odireleng Martin.
Afiliação
  • Mokoena TP; Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein ZA 9300, South Africa.
  • Linganiso EC; Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein ZA 9300, South Africa.
  • Kumar V; Photovoltaic Laboratory, Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi 110016, India.
  • Swart HC; Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein ZA 9300, South Africa.
  • Cho SH; Materials Architecturing Research Centre, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 02792, Republic of Korea.
  • Ntwaeaborwa OM; School of Physics, University of the Witwatersrand, Private Bag X3, Wits, 2050, South Africa. Electronic address: ntwaeab@gmail.com.
J Colloid Interface Sci ; 496: 87-99, 2017 06 15.
Article em En | MEDLINE | ID: mdl-28214627
The sol gel method was used to prepare rare-earths (Yb3+-Er3+ and Yb3+-Tm3+) co-doped Al2O3-TiO2 nano-composite powder phosphors and their up-conversion luminescence properties were investigated. Mixed oxides of titania (TiO2) rutile phase and an early stage crystallization of alumina (Al2O3) phase were confirmed from the X-ray diffraction data with the average crystallite size of ∼36nm. The rutile phase TiO2 was further confirmed by selected area diffraction analysis of the composites. Microscopy analysis showed interesting rod-like morphologies with rough surfaces indicating that a spherulitic growth process took place during the crystal growth. Photoluminescence characterization of the phosphors was carried out under near infra-red excitation at 980nm and the prominent emission bands were observed in the visible region at 523, 548 and 658nm for the Yb3+-Er3+ co-doped systems. Emission in bands extending from the visible to near infra-red regions were observed at 480, 650, 693 and 800nm for the Yb3+-Tm3+ co-doped systems. These upconverted emissions and energy transfer mechanisms taking place are discussed in detail.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2017 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2017 Tipo de documento: Article