Study on structural and photoluminescence property of SrCeO3 and SrCe0.98Sm0.02O3 perovskites

Abstract

Perovskites with improved structural and photoluminescence properties can be furnished by doping with rare earth elements. Strontium cerate perovskite host matrix plays a prime role in energy devices due to improved functional property, namely electrical conductivity. Electrochemical cells, hydrogen extractors, sensors have been greatly manufactured by innovators in past decade using doped strontium cerate perovskites. But only minimal innovation in the area of luminescence of this particular perovskite was found. In the present study, SrCeO3 and SrCe0.98Sm0.02O3 perovskites are synthesized for investigating the photoluminescence spectra. The perovskites are prepared by gel combustion technique. X-ray diffraction studies were carried out to investigate the evolution of the crystalline phase of the ceramic powder. Absorption bands in the UV region occur due to charge transfer transitions between the 4f orbital of Ce4+ and 2p orbital of oxygen ion in SrCeO3. Under UV excitations, the prepared perovskite nano phosphors show blue emission and orange-red emission respectively and was confirmed using CIE 1931 chromaticity diagram. The vibrational modes were further analysed using Raman spectra. So, these perovskites can be promising candidate as blue phosphor and red phosphor in light-emitting devices and applications.