کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1260608 | 971750 | 2008 | 5 صفحه PDF | دانلود رایگان |
In this experiment, strontium borate glasses were prepared using the conventional quenching method in air atmosphere. Optical absorption, photoluminescence excitation and emission spectra, X-ray excited luminescence (XEL), and luminescence decay curve of the as-prepared glasses were investigated at room temperature. The as-prepared glasses had two kinds of Eu ions, i.e., Eu2+ and Eu3+. Compared with the reported results of strontium borate glasses, Eu2+ luminescence was enhanced in the studied strontium borate glasses coprepared with F− and Li+ ions. The coexisting of Li+ or F− in the borate glasses could create more negative defect VSr? and stabilize Eu2+ ions, which might act as donor of electrons; For the F− doping, the new center of B(O, F)4 (or BO3F) and BO2F2 units could be considered to be the distorted (BO4), which were needed as a rigid framework to stabilize the divalent rare earth ions.
Journal: Journal of Rare Earths - Volume 26, Issue 4, August 2008, Pages 490-494