• Upconversion studies in rare earth ions-doped lanthanide materials

    • Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/082/02/0409-0412

    • Keywords

       

      Rare earth ions; phonon frequency; upconversion emission; fluorescence intensity ratio.

    • Abstract

       

      In the present work, results of upconversion emission in various powder samples have been discussed. The powder upconversion phosphors such as La2O3:Er3+/Yb3+, LaF3:Er3+/Yb3+, CeO2 :Er3+/Yb3+, CeF3:Er3+/Yb3+ were prepared and their upconversion emission, using 976 nm wavelength excitation, was investigated in depth. These phosphors have shown good upconversion emission in the visible region except for the CeF3:Er3+/Yb3+ phosphor. Two intense bands around 525 and 550 nm due to the 2H11/2$\to$4I15/2 and 4S3/2 $\to$ 4I15/2 transitions, respectively, are found to be in a thermally coupled state in these samples. The intensity ratio of these two bands permitted us to estimate the temperature of the environment. The pump power studies of the emission bands of these samples are also made to understand the dynamics of the upconversion emission.

    • Author Affiliations

       

      A K Singh1 K Kumar2 S B Rai3

      1. Department of Ceramic Engineering, IIT-BHU, Varanasi 221 005, India
      2. Department of Applied Physics, Indian School of Mines, Dhanbad 826 004, India
      3. Lasers and Spectroscopy Laboratory, Department of Physics, Banaras Hindu University, Varanasi 221 005, India
    • Dates

       
  • Pramana – Journal of Physics | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.