کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5399356 | 1505900 | 2015 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Temperature-dependent luminescence of GdTaO4 single crystal
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Recently, we proposed GdTaO4 as a promising high-density scintillator but the scintillation mechanism was still unknown. In this paper, we investigated the temperature-dependent luminescent properties of GdTaO4 crystal. The emission spectra are characterized by a broad band composed of two Gaussian components located at ~2.2Â eV and ~2.7Â eV of 8-300Â K, which are both thermally quenched with the activation energy of 156Â meV and 175Â meV, respectively. These two bands are believed to be from different luminescent centers, judging from the excitation spectra, thermal activation energy and decay curves. Additionally, it was also found that the annealing atmosphere exerts little influence on the luminescence intensity. Based on the results, we tentatively assigned the high-energy band to self-trapped excitons (STE) localized in TaO43â groups and the low-energy band to relaxed excitons related to lattice imperfections.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 160, April 2015, Pages 90-94
Journal: Journal of Luminescence - Volume 160, April 2015, Pages 90-94
نویسندگان
Huajun Yang, Fang Peng, Qingli Zhang, Chaoshu Shi, Changxin Guo, Xiantao Wei, Dunlu Sun, Xiaofei Wang, Renqin Dou, Xue Xing, Huili Zhang,