title: Study of formation of deep trapping mechanism by UV, beta and gamma irradiated Eu(3+) activated SrY2O4 and Y4Al2O9 phosphors.
abstract: This paper reports the thermoluminescence properties of Eu(3+) doped different host matrix phosphors (SrY2O4 and Y4Al2O9). The phosphor is prepared by high temperature solid state reaction method. The method is suitable for large scale production and fixed concentration of boric acid using as a flux. The prepared samples were characterized by X-ray diffraction technique and the crystallite size calculated by Scherer's formula. The prepared phosphor characterized by Scanning Electron Microscopic (SEM), Fourier Transform Infrared (FTIR), Energy Dispersive X-ray analysis (EDX), thermoluminescence (TL) and Transmission Electron Microscopic (TEM) techniques. The prepared phosphors for different concentration of Eu(3+) ions were examined by TL glow curve for UV, beta and gamma irradiation. The UV 254nm source used for UV irradiation, Sr(90) source was used for beta irradiation and Co(60) source used for gamma irradiation. SrY2O4:Eu(3+)and Y4Al2O9:Eu(3+) phosphors which shows both higher temperature peaks and lower temperature peaks for UV, beta and gamma irradiation. Here UV irradiated sample shows the formation of shallow trap (surface trapping) and the gamma irradiated sample shows the formation of deep trapping. The estimation of trap formation was evaluated by knowledge of trapping parameters. The trapping parameters such as activation energy, order of kinetics and frequency factor were calculated by peak shape method. Here most of the peak shows second order of kinetics. The effect of gamma, beta and UV exposure on TL studies was also examined and it shows linear response with dose which indicate that the samples may be useful for TL dosimetry. Formation of deep trapping mechanism by UV, beta and gamma irradiated Eu(3+) activated SrY2O4 and Y4Al2O9 phosphors is discussed in this paper.
authors.affiliation: Department of Physics, Bhilai Institute of Technology, Raipur, New Raipur 493661, India. Electronic address: jsvikasdubey@gmail.com.
authors.forename: Vikas
authors.initials: V
authors.lastname: Dubey
authors.affiliation: Department of Physics, Govt. Y.T.PG. Auto. College, Durg 491001, India.
authors.forename: Jagjeet
authors.initials: J
authors.lastname: Kaur
authors.affiliation: Department of Physics, Govt. Y.T.PG. Auto. College, Durg 491001, India.
authors.forename: Yogita
authors.initials: Y
authors.lastname: Parganiha
authors.affiliation: Department of Physics, Govt. Y.T.PG. Auto. College, Durg 491001, India.
authors.forename: N S
authors.initials: NS
authors.lastname: Suryanarayana
authors.affiliation: Display Materials Laboratory, Applied Physics Department, Faculty of Technology and Engineering, The M. S. University of Baroda, Vadodara 390001 India.
authors.forename: K V R
authors.initials: KVR
authors.lastname: Murthy
mesh_terms: D000537:Aluminum Oxide; D001610:Beta Particles; D005063:Europium / Q000737:chemistry* / Q000528:radiation effects*; D005720:Gamma Rays; D007700:Kinetics; D049449:Luminescence; D008163:Luminescent Measurements; D008855:Microscopy, Electron, Scanning; D013052:Spectrometry, X-Ray Emission; D017550:Spectroscopy, Fourier Transform Infrared; D013324:Strontium; D013819:Thermoluminescent Dosimetry; D014466:Ultraviolet Rays; D014961:X-Ray Diffraction; D015019:Yttrium
chemical_list: D005063:Europium; D015019:Yttrium; D000537:Aluminum Oxide; C091417:yttria; D013324:Strontium
keywords: Beta; Effect of europium concentration; Gamma; Phosphors; Radiation effect; TL dosimetry; Thermoluminescence; UV