کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5442685 | 1510770 | 2017 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Crystal growth and scintillation properties of undoped and Ce3+-doped GdI3 crystals
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
The growth and scintillation properties of undoped and Ce3+-doped GdI3 crystals were reported in this paper. These GdI3:Ï%Ce (ÏÂ =Â 0, 1, 2) crystals were grown by the vertical Bridgman growth technique in evacuated quartz crucibles. X-ray excited optical luminescence spectra of GdI3:Ce exhibit a broad emission band (450Â nm-650Â nm) peaking at 520Â nm corresponding to 5d1â4f1 transition of Ce3+ while the undoped GdI3 crystal consists of a broad band (400Â nm-600Â nm) and several sharp lines peaking at 462Â nm, 482Â nm, 492Â nm, 549Â nm, 579Â nm owing to the impurities ions and defects. The excitation spectra of Ce3+ doped GdI3 consist of two broad bands between 300Â nm and 500Â nm corresponding to 4f1â5d1 absorption of Ce3+. The other absorption peaking at 262Â nm in the spectrum of GdI3:2%Ce is assigned to band-to-band exciton transition. The excitation spectrum of undoped GdI3 contains a flat absorption band from 330 to 370Â nm and a broad band between 390 and 450Â nm peaking at 414Â nm corresponding to the absorption of the unintentionally doped Ce3+, Dy3+, Ho3+ impurities and other defects. The emission spectrum of undoped GdI3 under 332Â nm excitation has the identical line peaks with the spectrum measured under X-ray excitation. The emission spectra of GdI3:2%Ce and GdI3:1%Ce show a broad band in the range of 450-750Â nm with the maximum at 550Â nm corresponding to 5d1â4f1 transitions of Ce3+ ion. The GdI3, GdI3:1%Ce and GdI3:2%Ce show fast principle decay time constant 73Â ns, 69Â ns and 58Â ns respectively, besides, the undoped also shows a slow decay constant 325Â ns which doesn't appear in Ce3+-doped GdI3 crystal. The energy resolutions of GdI3:Ï%Ce (ÏÂ =Â 1, 2) measured at 662Â KeV are about 3%-5% and the undoped GdI3 is 13.3%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 64, February 2017, Pages 121-125
Journal: Optical Materials - Volume 64, February 2017, Pages 121-125
نویسندگان
Le Ye, Huanying Li, Chao Wang, Jian Shi, Xiaofeng Chen, Zhongqing Wang, Yuefeng Huang, Jiayue Xu, Guohao Ren,