کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5459603 | 1516185 | 2017 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Concentration quenching of blue upconversion luminescence in Tm3+/Yb3+ co-doped Gd2(WO4)3 phosphors under 980 and 808Â nm excitation
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
This paper reported on the upconversion (UC) spectroscopic properties of Tm3+/Yb3+ codoped Gd2(WO4)3 phosphors synthesized by a traditional co-precipitation method upon excitation of 980 and 808 nm commercial available fiber lasers, respectively. X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) were used to characterize the crystal structure and morphology of the samples. Intense blue emission (1G4 â 3H6) and near-infrared (NIR) emission (3H4 â 3H6) as well as weak red emission (1G4 â 3F4) of Tm3+ were observed under 980 nm excitation. The concentration quenching processes for blue and NIR emissions were discussed. The blue emission intensity has a cubic dependence on the fiber laser working current, indicating a three-photon process involved in blue UC emission. The blue emission and its concentration quenching process for Tm3+/Yb3+ codoped Gd2(WO4)3 phosphors were also investigated under 808 nm excitation. Weak blue emission (1D2 â 3F4) was detected in the UC spectra other than the weak red emissions (1G4 â 3F4, 3F2,3 â 3H6). The dominant mechanism for blue emission under 808 nm excitation was attributed to the back energy transfer (BET) Tm3+ â Yb3+ and the energy transfer (ET) Yb3+ â Tm3+ processes. Upon 808 nm excitation, a two-photon process was deduced from the quadratic dependence of blue UC emission intensity on the fiber laser working current.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 709, 30 June 2017, Pages 147-157
Journal: Journal of Alloys and Compounds - Volume 709, 30 June 2017, Pages 147-157
نویسندگان
Yanqiu Zhang, Sai Xu, Xiangping Li, Jiashi Sun, Jinsu Zhang, Hui Zheng, Hua Zhong, Ruinian Hua, Haiping Xia, Baojiu Chen,