• DEEPTHI N RAJENDRAN

      Articles written in Bulletin of Materials Science

    • Temperature-independent photoluminescence response in ZnO:Ce nanophosphor

      G L BHAGYALEKSHMI A P NEETHU SHA DEEPTHI N RAJENDRAN

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      A comparative study of structural and luminescence properties of ZnO:Ce$*{3+}$ nanophosphors prepared by combustion method and solid-state reaction method is presented in this study. The powder XRD exhibits hexagonal wurtzite phase and crystallite size falls in the nanometre range. The optical band gap reduction is less in samples synthesized by combustion method. Photoluminescence (PL) spectra of ZnO:Ce excited at near-ultra violet region (325 nm) gives an evidence of its wide range of applications in lighting purposes.

    • Structural and optical studies of cerium doped gadolinium oxide phosphor

      J S REVATHY N S CHITRA PRIYA K SANDHYA DEEPTHI N RAJENDRAN

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      This research aims to study the influence of variation of doping concentration on various properties of Ce$^{3+}$ doped Gd$_2$O$_3$ phosphor. The phosphors (Gd$_{1-x}$Ce$_x$)$_2$O$_3$ ($0 \leq x \leq 0.15$) were successfully synthesized by the solution combustion method. The structural and optical properties of the prepared phosphors were studied. Rietveld refinement confirms the formation of the cubic phase. Fourier transform infrared spectra further confirm the formation of the phosphor. It is found that an enhancement in doping concentration of Ce$^{3+}$ results in the expansion of the crystal lattice, leading to a reduction in crystallite size as well as in the optical band gap. Photoluminescence emission spectra are studied, and the exact emission colour is confirmed using 1931 Commission Internationale de l’Eclairage (CIE) chromaticitycoordinates. The prepared phosphor exhibits bluish green emission corresponding to 5d–4f transitions of the trivalent cerium ion and can be used as a promising candidate in optical display applications and LED applications.

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    • 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

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      Posted on July 25, 2019

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