Abstract
In this work, structural and thermoluminescence (TL) characteristics for ZnB2O4:xTb3+ (x = 0.01, 0.02, 0.03, 0.04, 0.05, and 0.10 mole) phosphors were investigated. The phosphors were prepared via synthesis of nitric acid. The X-ray diffraction (XRD) studies show that the synthesized samples can be indexed to nearly single-phase cubic ZnB2O4. The TL characteristics following 90Sr beta irradiation (40 mCi) were studied. TL intensity is found to depend on Tb concentration. The optimal concentration of the doped Tb3+ is 0.03 mol in TL measurements. TL dose responses of the phosphors to beta doses of 0.143, 0.715, 1.43, 15, 30 and 60 Gy showed fairly linear behavior. The minimum detectable dose (MDD) value for ZnB2O4:0.04Tb3+ was found to be 87 mGy. The kinetic parameters of the ZnB2O4:0.03Tb3+ sample were estimated by the glow curve deconvolution, the initial rise, the curve fitting, and the peak shape methods. The results indicate that these phosphors are thought to be promising candidates as TL materials. The results provide valuable knowledge of the characteristics of Tb-doped ZnB2O4 for use in dosimetry research.
Highlights
Zinc borate (ZnB2 O4 ) is a boron-based inorganic material
Powder X-ray diffraction (XRD) patterns showed intense and sharp peaks at almost the same angle position. This is a strong indication that the samples have high crystallinity. These diffraction patterns are in good agreement with the standard JCPDS card No 39–1126, which represents the pure phase of ZnB2 O4
No additional signal was observed in the XRD patterns of other phosphors, except for the ZnB2 O4 :0.10Tb3+ phosphor
Summary
Zinc borate (ZnB2 O4 ) is a boron-based inorganic material. This material has low toxicity, wide-band-gap, excellent luminescence efficiency, good thermal stability, and low cost [1,2,3,4]. Zinc borates doped with different rare earth ions have been widely used by many research groups as host materials for luminescence applications. Examples include ZnB2 O4 :Eu3+ [4], ZnB2 O4 :Ce3+ ,La3+ [5], ZnB2 O4 :Eu3+ [6], ZnB2 O4 :Tb3+ [7], ZnB2 O4 :Dy3+ [8], ZnB2 O4 :Bi3+ ,Eu3+ [9], ZnB2 O4 :Sm3+ [10], ZnB2 O4 :Pr3+ [11], ZnB2 O4 :Mn2+ [12]. Various methods have been used to prepare the abovementioned luminescence materials.
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