STRUCTURAL AND PHOTOLUMINESCENCE PROPERTIES OF DY3+IONS DOPED POTASSIUM MAGNESIUM SAGNESIUM MOLYDBATE PHOSPHOR FOR LIGHTING DEVICES

Abstract

A series of K2Mg2(MoO4)3 (KMM) phosphors doped with Dy3+ ions were synthesized by the solid-state reaction (SSR) method. The crystal structure and photoluminescence (PL) properties were investigated through instrumentation techniques like X-ray diffraction (XRD) and Spectrofluorophotometer. The KMM material is a member of the P212121 space group and has an orthorhombic structure. Based on the diffuse reflectance spectrum (DRS) measurements, the optical bandgap was calculated. The synthesized phosphor material exhibits a 4f transition of Dy3+ ions, excited by 387 nm, and the most intense emission peak was observed at 576 nm. Double exponential behaviour was seen in the PL decay spectral profiles taken under an excitation wavelength of 387 nm. The CIE coordinates of the prepared phosphor lie in yellowish white region. We wish to propose Dy3+ ions doped KMM phosphor as a viable material for applications in white light emitting diodes (w-LEDs)