Nd2O3:Gd3+ nanocrystalline phosphor: gamma-Induced thermoluminescence, EPR and structural properties

摘要

Preparation of nanocrystalline Nd2O3:Gd3+ (2 mol%) phosphor was prepared by propellant combustion route at low temperature. Powder X-ray diffraction (PXRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) techniques were used to study the structural and morphological features. A and C type hexagonal phase of Nd2O3 was obtained in as-formed and calcined product at 900 degrees C for 3 h. SEM images show the product was highly porous, agglomerated and irregular shaped particles. The average crystallite size estimated from Scherrer's and W-H plots were found to be in the range similar to 20-50 nm. Combination of F-g and (F-g + E-g) modes were observed from Raman studies. A single TL glow peak at 409 K was recorded at a warming rate 5 degrees C s (1). TL response as a function of gamma-irradiation showed linear response up to 1.6 kGy and later it followed exponential growth. The phosphor show simple glow curve structure with less fading over a period of 30 days. Trap parameters were estimated from Chen's peak shape method. The activation energy (E) and frequency factor (s) was found to in the range 1.377-2.934 eV and 2.01 x 10(11)-8.70 x 10(22) Hz respectively. (C) 2013 Elsevier B.V. All rights reserved.