• R JAYAKRISHNAN

      Articles written in Bulletin of Materials Science

    • Near-white light emission from samarium and dysprosium combined doped calcium zirconate spin-coated thick film

      MEENU VENUGOPAL H PADMA KUMAR R JAYAKRISHNAN

      More Details Abstract Fulltext PDF

      This study investigates the preparation and characterization of CaZr$_{0.9}$Sm$_{0.025}$Dy$_{0.075}$O$_3$-coated film system. The powder used for coating was prepared by solid-state ceramic route synthesis and spin coating technique was used to prepare the film of the CaZr$_{0.9}$Sm$_{0.025}$Dy$_{0.075}$O$_3$ system. Structural studies were carried out using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy. The XRD peaks of spin-coated system were indexed for an orthorhombic (Pnma) perovskite structure of CaZrO$_3$. The film when excited at 350 nm yield blue-green emission at 482 and 571 nm,which corresponds to the transition from ${}^4$F$_{9/2}$ to ${}^6$H$_{15/2}$ and ${}^6$H$_{13/2}$ levels of Dy$^{3+}$ ion, respectively, and orange-red emission at 603 and 657 nm corresponds to the transition from ${}^4$G$_{5/2}$ to ${}^6$H$_{7/2}$ and ${}^6$H$_{11/2}$ transitions of Sm$^{3+}$ ions,respectively. CIE coordinates of the film show near-white light emission from the system.

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