Synthesis And Luminescent Performance Of LaPO4: Dy Nanophosphor

¹Department of Physics, Dr. Ambedkar College, Chandrapur (M. S.), India

²Department of Physics, RTM Nagpur University, Nagpur 440033, India

Adv. Mater. Lett., 2014, 5 (12), pp 688-691

DOI: 10.5185/amlett.2014.amwc472

Publication Date (Web): Dec 02, 2014

Copyright © IAAM-VBRI Press

 E-mail: sjdhoble@rediffmail.com

Abstract

Nowadays the research on synthesis of inorganic luminescent material with proper dimensions and morphologies has attracted great attention. Inorganic luminescent materials like LaPO₄ have found many practical applications in the field of electroluminescent devices, integrated optics, biological labels, modern lighting and display fields. We have prepared Dysprosium (Dy) doped LaPO₄ nanoparticles at relatively low temperature in polyethylene glycol (PEG) medium by wet chemical method. Dy³⁺ is doped in LaPO₄ at various atomic concentrations (1, 2, 5 and 10 at %). All the samples have been characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), photoluminescence (PL) and thermoluminescence (TL) techniques. XRD study reveals the monoclinic structure of prepared nanoparticles. Unit cell volume is found to be decrease linearly with increasing Dy³⁺concentration indicating homogeneous substitution of La³⁺ ions in LaPO₄ by Dy³⁺. From the FTIR study it is found that the band at 1044 cm^-1 assigned to the phosphate group PO₄^3- in the region of υ₃ anti-symmetric stretching of P-O band. The PL spectrum shows emission band at about 435 nm is observed due to the transision of Dy³⁺ ions corresponding to wavelength in the blue color region. The glow curve of LaPO₄: Dy phosphor obeys second order kinetics.

Keywords

Wet-chemical synthesis, XRD, PL, TL, TEM, LaPO₄