کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5399493 | 1505903 | 2015 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Upconversion luminescence and mechanisms of Nd3+/Ho3+/Yb3+ triply doped TeO2-K2O-Nb2O5 glasses
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
Nd3+/Ho3+/Yb3+ triply doped TeO2-K2O-Nb2O5 glasses were synthesized by the conventional melting-quenching technique. Single green upconversion (UC) luminescence centered at 532Â nm, corresponding to the (5F4, 5S2)â5I8 transitions of Ho3+, was observed under 800Â nm excitation. However, green and red emission bands centered at 547, 662 and 758Â nm, corresponding to the (5F4, 5S2)â5I8, 5F5â5I8 and (5F4, 5S2)â5I7 transitions of Ho3+, respectively, were simultaneously observed under 980Â nm excitation. The dependence of UC luminescence intensity of Ho3+ under 800 and 980Â nm excitations on Yb3+ concentration was studied. It was found, under 800Â nm excitation, the 532Â nm emission intensity of Ho3+ begin to reduce when the Yb3+ concentration is higher than 0.8Â mol%. However, at the same concentration of Yb3+, the emission quenching was not observed under 980Â nm excitation. The UC mechanisms under two pumping sources were discussed in terms of the experiment results. It was found that the UC luminescence of Ho3+ mainly depends on ET under 800Â nm excitation; however under 980Â nm excitation, it mainly depends on ESA.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 157, January 2015, Pages 179-183
Journal: Journal of Luminescence - Volume 157, January 2015, Pages 179-183
نویسندگان
Yuebo Hu, Jianbei Qiu,