Synthesis and luminescence properties of Rare earth doped substituted co doped Barium lanthanum aluminate phosphors For pc led applications

Abstract

A study of the rare earth doped aluminates based host phosphors have been extensively studied for their excellent photoluminescence properties. Based on the literature and concerning the lighting requirements; the compound BaLaAlO4 was chosen as the host lattice for the present investigation. The host lattice BaLaAlO4 belongs to ABCO4 compound type (A - divalent metal cation, B trivalent metal cation, C Al or Ga and O O2- ion) which was developed and studied so far for various technological applications such as superconductors and solid state lasers. Earlier reports indicated the achievement of BaLaAlO4 phase formation at temperatures greater than 1100ºC for several hours. In the present study, the lanthanide ion Eu3+/Sm3+/Dy3+ is chosen for doping and substitution in the BaLaAlO4 host lattice. Eu3+ is an efficient luminescent center which provides intense red emission as a result of 4f-4f transition by occupying appropriate site symmetry in various host lattices. The new red emitting Eu3+ doped and substituted BaLaAlO4 phosphor powders synthesized by modified solid state reaction method. It elaborates the powder X-ray diffraction (XRD) analysis of BaLaAlO4 crystal phase formation. Fourier Transform - Infra Red (FT-IR) analysis performed to study the formation of the host with respect to temperature increment and metal-oxygen bond vibrations of BaLaAlO4 host lattice is explained. Morphology of the phosphor is analyzed using HR-SEM analysis. newline