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

Abstract

This study investigates the preparation and characterization of CaZr0.9Sm0.025Dy0.075O3-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 CaZr0.9Sm0.025Dy0.075O3 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 CaZrO3. The film when excited at 350 nm yield blue-green emission at 482 and 571 nm, which corresponds to the transition from 4F9/2 to 6H15/2 and 6H13/2 levels of Dy3+ ion, respectively, and orange-red emission at 603 and 657 nm corresponds to the transition from 4G5/2 to 6H7/2 and 6H11/2 transitions of Sm3+ ions, respectively. CIE coordinates of the film show near-white light emission from the system.