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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/031/03/0461-0465

    • Keywords

       

      Nanocrystals; erbium; upconversion; two-photon excitation.

    • Abstract

       

      Here, we report the dopant concentration and pump-power dependence upconversion emission properties of erbium doped BaTiO3 nanocrystals derived from sol–emulsion–gel method. Green (550 nm) and red (670 nm) upconversion emissions were observed at room temperature from the ${}^{4}S_{3/2}$ and ${}^{4}F_{9/2}$ levels of Er3+ : BaTiO3 nanocrystals. It is found that at 850 mW of cw excitation power (at 980 nm) the total luminescence was 17130 Cd/m2 for 1000°C heated 0.25 mol% Er-doped BaTiO3 nanocrystals. It is worthwhile to mention that the unusual power-dependent upconversion luminescence (saturation) is observed at higher dopant concentration (2.5 mol%) and high pump power. Our analysis confirms that the depletion of the excited state is responsible for the relevant fluorescence upconversion. We have again confirmed that a twophoton excited state absorption process occurs for all samples.

    • Author Affiliations

       

      Pushpal Ghosh1 Suparna Sadhu1 Tapasi Sen1 Amitava Patra1

      1. Department of Materials Science and Centre for Advanced Materials, Indian Association for the Cultivation of Science, Kolkata 700 032, India

    • Dates

       
      Published
      June 2008

  • Bulletin of Materials Science | News

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      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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