Investigation of novel Eu doped SrDy2O4 microphosphor for thermoluminescence dosimetry

• Published in: Journal of luminescence 2021-03, Vol.231, p.117781, Article 117781
• Main Authors: Gavhane, Kishor H., Bhadane, Mahesh S., Kulkarni, Preeti P., Bhoraskar, V.N., Dhole, S.D., Dahiwale, S.S.
• Format: Article
• Language: English
• Subjects: Initial rise method; Photoluminescence; Solid state diffusion; SrDy2O4; Thermoluminescence; Tm- Tstop analysis; Trapping parameters
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2020.117781

Herein, we report the thermoluminescence properties of novel SrDy2O4: Eu microphosphor synthesized via facile solid state diffusion method. The phase purity, crystal structure, surface morphology, photoluminescence, and dosimetric properties were examined by XRD, SEM, photoluminescence spectroscopy, and thermoluminescence techniques, respectively. The as-prepared microphosphor revealed an orthorhombic phase having irregular shaped particles with an average size of approximately ~1.4–1.6 μm. The photoluminescence studies showed emission bands in the red region with prominent peaks centered at ~594 nm and ~625 nm corresponding to 5D0→7F1 and 5D0→7F2 transitions of Eu3+ ion. The thermoluminescence properties of gamma-irradiated SrDy2O4: Eu phosphors were investigated. The systematic study on optimum concentrations of dopants was performed by varying the Eu concentration from 0.5 to 3 mol %. The favorable thermoluminescence glow curve was obtained for 1% Eu doped SrDy2O4 phosphor at 203 °C. The SrDy2O4: 1% Eu phosphor showed a linear TL response in the range from 1 Gy to 4 kGy gamma dose. The whole peak method, variable heating rate method, Tm –Tstop technique and Initial Rise Method (IRM) is carried out for trap level analysis and to experimentally determine the activation energy. The trapping parameters of glow curves i.e. frequency factor (s), order of kinetics (b), etc are estimated by Glow Curve Deconvolution (GCD) method. The potential thermoluminescence dosimetric properties of SrDy2O4: Eu phosphor provides a promising system for high dose radiation and environmental dosimetric application. •SrDy2O4: Eu was reported for the first time for their TL dosimetric properties.•The morphological studies showed micron sized particles.•Dose response of SrDy2O4: Eu microphosphor is in the range from 1 Gy to 4 kGy.•Trapping parameters are determined by using Tm-Tstop analysis and Initial Rise Method.