Thermoluminescent response and kinetic parameters of Eu³⁺-doped LiF crystals exposed to X-rays

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• 作者：Miguel Á ; ngel Vallejo^a ; Modesto Antonio Sosa^a ; ^{modesto@fisica.ugto.mx} ; Marí ; a Lilia Villalobos^a ; Juan Carlos Azorí ; n^a ; Ricardo Navarro^b ; Emma Encarnació ; n^c ; Luis Armando Dí ; az^d
• 关键词：LiF-crystals ; Eu3+ dopant ; TL intensity ; Kinetic parameters
• 刊名：Journal of Luminescence
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：182
• 期：Complete
• 页码：160-165
• 全文大小：431 K
• 卷排序：182

文摘

In the present work pure and Eu3+-doped LiF crystals were synthesized through co-precipitation method and the effect of Eu3+ concentration on the thermoluminescent (TL) response is reported. A cubic crystalline phase was determined by XRD for all synthesized samples. The photoluminescence spectra as well as UV–vis absorbance were also analyzed and four emissions bands centered at 592 nm (5D0 → 7F1), 614 nm (5D0 → 7F2), 652 nm (5D0 → 7F3) and 698 nm (5D0 → 7F4) have been observed. The TL response to X-ray irradiation was studied for an exposition of 43 R during a total time of 52 s. The presence of Eu3+ in the samples enhanced the TL signal, due to the Eu3+ ions that are incorporated into the LiF crystalline lattice which promotes the formation of defects in the unit cell. The kinetic parameters (E, b, s) were calculated using the glow-curve shape method. Energy traps around E=1 eV and frequency factors on the order s=108 s−1 were obtained on average, regardless of the Eu3+ concentration. The host of LiF showed the higher characteristic energies and frequency factors, respectively. The 1.0 mol% Eu3+-doped sample was found to have a sensitivity 5 times greater than the host of LiF. The good TL sensitivity to X- ray exhibited by the Eu3+-doped LiF crystals synthesized in this work, suggests that this material should be further studied with respect to other characteristics before being used as a radiation dosimeter.