Enhanced Thermos luminescence Properties of Synthesized Monoclinic Crystal Structure

Sharma S and Dubey SK

Published on: 2023-03-25

Abstract

Ba (NO₃)₂, Mg (NO3)₂, SiO₂ * H₂O, NH₂CONH₂, Eu (NO₃)₃ and H₃BO₃ are used as the raw materials for the synthetization of Ba₂MgSi₂O₇ (RE: Eu) nano sized powder sample using combustion synthesis technique (CST). X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and thermoluminescence (TL) spectra are employed to examine the effect of varying doping concentration of Eu ions on crystalline structure, surface morphology, and thermal characteristics. The monoclinic Ba₂MgSi₂O₇ compound has a dominant phase characteristic, according to powder XRD patterns, and there are additionally dopants exist that have no discernible impact on the host crystal structure. This melilite group structure yields a layered compound. Standard JCPDS PDF file #23-0842 closely matched the synthesized powder sample's usual XRD patterns. The average particle size (D) of the flake- like Ba_2-xEu_xMgSi₂O₇ (x=0.05) phosphor is calculated to be nearly ~70 nm. Systematically examined and described are the thermal characteristics as expressed by TL glow curves. The observations demonstrate that a variety of UV exposure to radiation times, such as 5 minutes, 10 minutes, 15 minutes, 20 minutes, and 25 minutes, had almost no impact on the peak positions in the present spectra. Using TL glow curves and Chen's glow curve approach, the various trapping parameters, including trap depth or activation energy (E), frequency factor (s^- 1), and shape factor (µ_g), are evaluated.