X-ray excited luminescence of polystyrene composites loaded with SrF₂ nanoparticles

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• 作者：T.M. Demkiv^a ; ; O.O. Halyatkin^a ; V.V. Vistovskyy^a ; V.B. Hevyk^c ; P.M. Yakibchuk^a ; A.V. Gektin^b ; A.S. Voloshinovskii^a
• 关键词：Polystyrene composite scintillator ; SrF2 nanoparticles ; X-ray excited luminescence ; Photoeffect ; Fast time response
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2017
• 出版时间：1 March 2017
• 年：2017
• 卷：847
• 期：Complete
• 页码：47-51
• 全文大小：600 K
• 卷排序：847

文摘

The polystyrene film nanocomposites of 0.3 mm thickness with embedded SrF2 nanoparticles up to 40 wt% have been synthesized. The luminescent and kinetic properties of the polystyrene composites with embedded SrF2 nanoparticles upon the pulse X-ray excitation have been investigated. The luminescence intensity of the pure polystyrene scintillator film significantly increases when it is loaded with the inorganic SrF2 nanoparticles. The film nanocomposites show fast (∼2.8 ns) and slow (∼700 ns) luminescence decay components typical for a luminescence of polystyrene activators (p-Terphenyl and POPOP) and SrF2 nanoparticles, respectively. It is revealed that the fast decay luminescence component of the polystyrene composites is caused by the excitation of polystyrene by the photoelectrons escaped from the nanoparticles due to photoeffect, and the slow component is caused by reabsorption of the self-trapped exciton luminescence of SrF2 nanoparticles by polystyrene.