کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5460123 | 1516170 | 2017 | 39 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Excimer-like Yb3+-pair and photoluminescence spectra of Yb3+-molybdates
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Excimer-like Yb3+-pair and photoluminescence spectra of Yb3+-molybdates Excimer-like Yb3+-pair and photoluminescence spectra of Yb3+-molybdates](/preview/png/5460123.png)
چکیده انگلیسی
We found a broad cooperative luminescence (CL) band due to Yb-pair at 470-520Â nm in the up-conversion spectra of an Yb3+-molybdate, LiYb(MoO4)2 which was excited at 975Â nm. Evidence is presented for reasonability of the assignment of the blue-green emission to CL. The emission from Yb-pair usually leads us to expectation in observation of its absorption from Yb-pair. Any absorption due to Yb-pair, however, was not found although several challenges were made. It is suggested that absence of the Yb-pair absorption is due to presence of excimer-like Yb-pair in LiYb(MoO4)2. Unusually much weaker CL intensity was observed than the up-converted emission from RE in very lightly RE-doped LiYb(MoO4)2 even at high 975Â nm laser power, where REÂ =Â Tm3+, Eu3+, Er3+, Tb3+, and Ho3+. Discussion is made on the reason. The up-conversion measurement for Yb3+-compounds is useful (1) for detection of unwanted impurities even in carefully purified chemical compounds and (2) for generation of intense up-converted green-red emissions from RE3+-doped LiYb(MoO4)2.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 724, 15 November 2017, Pages 520-527
Journal: Journal of Alloys and Compounds - Volume 724, 15 November 2017, Pages 520-527
نویسندگان
Xuebin Qiao, Taiju Tsuboi,