کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7840050 | 1505861 | 2018 | 21 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Crystal structure, electronic structure, optical and scintillation properties of self-activated Cs4YbI6
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
A self-activated Cs4YbI6 single crystal was grown by the vertical Bridgman method. Crystal structure refinements verified the phase purity and the trigonal crystal system with a space group of R3Ì
c. By using differential scanning calorimetry, the melting and crystallization points were determined to be 550 and 510â°C, respectively. Luminescence and scintillation properties were systematically studied. Upon ultraviolet light (360ânm) excitation, the Cs4YbI6 crystal exhibits bluish-green emission centered at 450 and 480ânm due to spin-allowed and spin-forbidden transitions of Yb2+ activators. The lifetimes of the corresponding emission bands at room temperature are tens and hundreds of nanoseconds, respectively. X-ray excited radioluminescence spectrum is dominated by the spin-forbidden transition of Yb2+ at 480ânm. The absolute light yield is 2700â±â200 photons/MeV with a principal scintillation decay time of 33âns. The physical explanation for the low light yield observed is proposed from experimental and theoretical insights.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 201, September 2018, Pages 460-465
Journal: Journal of Luminescence - Volume 201, September 2018, Pages 460-465
نویسندگان
Yuntao Wu, Bryan C. Chakoumakos, Hongliang Shi, Mao-Hua Du, Ian Greeley, Matthew Loyd, Daniel J. Rutstrom, Luis Stand, Merry Koschan, Charles L. Melcher,