کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5399152 | 1392674 | 2016 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Studies on phosphorescence and trapping effects of Mn-doped and undoped zinc germinates
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Photoluminescence and phosphorescence from different recombining centers in the Mn2+-doped and undoped Zn2GeO4 phosphors have been observed. By UV excitation the undoped sample presents a broad band of blue-white emission from the host defects while the Mn-doped samples show both the host and Mn2+ emissions with different phosphorescent durations. At the beginning of UV excitation after the phosphorescence has been exhausted, the fluorescent time dependence of Mn2+ exhibits a fast decay process to a constant intensity, different from the rising or charging process as the typical behavior for the common persistent phosphors. This unusual behavior was studied using electron paramagnetic resonance (EPR) spectroscopy. A decrease of the EPR signal from Mn2+ was found for the sample under UV irradiation, suggesting the occurrence of ionization of Mn2+ to Mn3+. A slow recovering process of the ionization has also been detected, which is consistent with the observation of phosphorescence from Mn2+ doped samples.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 169, Part B, January 2016, Pages 622-626
Journal: Journal of Luminescence - Volume 169, Part B, January 2016, Pages 622-626
نویسندگان
Zhiyi He, Li Ma, Xiaojun Wang,