Articles written in Bulletin of Materials Science

    • Turning of luminescence properties of Ba$_2$V$_2$O$_7$ phosphors by co-doping Eu$^{3+}$/Dy$^{3+}$ ions


      More Details Abstract Fulltext PDF

      A series of Ba$_{1.97–x}$Eu$_{0.03}$Dy$_x$V$_2$O$_7$ (x = 0.01, 0.02, 0.03, 0.04 and 0.05) phosphor materials were synthesized by hydrothermal method. Phase purity, structural, optical and luminescence characteristics of as-synthesized phosphorshave been studied using powder X-ray diffraction (PXRD), UV–visible spectroscopy and fluorescence spectrometry. The XRD patterns of as-synthesized phosphors were indexed and predicted as triclinic structure. The broad absorption in the UV region was originated from [VO$_4$]$^{3-}$ group charge transfer and the sharp peaks observed in the visible to near-infrared (NIR) region was originated from Eu$^{3+}$/Dy$^{3+}$ ions charge transfer. In photoluminescence (PL) spectra, the broad emission peak observed from 400 to 570 nm was due to the charge transfer band of [VO$_4$]$^{3-}$ group. A sharp peak observed from 570 to 710 nm were due to the charge transition of Eu$^{3+}$/Dy$^{3+}$ ions. The PL spectra recorded for different excitations at 268, 344, 335, 346, 346 and 339 nm, emitted bluish white colour with slight changes in its Commission International de l'Eclairage coordinate values. The white colour emission of Ba$_{1.97–x}$Eu$_{0.03}$Dy$_x$V$_2$O$_7$ phosphors was observed by the irradiation under the UV light 365 nm. Hence, the results have suggested that the as-prepared phosphor materials are the potential candidates in the fabrication of a UV or near-UV chip-excited white light-emitting diode.

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2022-2023 Indian Academy of Sciences, Bengaluru.