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genhunter

至尊木虫 (著名写手)

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虫号: 2558361
注册: 2013-07-22
专业: 肿瘤化学药物治疗

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超级老快: 金币+50, 翻译EPI+1, ★★★很有帮助 2016-03-29 11:13:36

In Summary, ɑ-NaYF4 and β-NaYF4 nanocrystals were precipitated within the transparent Zincatesilion oxyfluoride glass by adjusting the ratio of (relative content of) ZnO and Na2O of the glass components, respectively. As the ratio of ZnO/Na2O increased, the connectivity of the glass network was greatly enhanced, which resulted in increases of the transition and the crystallization temperature of the glass. Under excitation at 980 nm , the characteristic Tb3+ emission peaks were observed in NaYF4:Tb3+/Yb3+ glass ceramics. In comparison with the cubic sample, the hexagonal NaYF4 can emit enhanced UC luminescence. Moreover, under excitation at 393 nm , the symmetry (of the emission curve?) around Eu3+ in the cubic NaYF4 glass ceramics is higher than that in the hexagonal sample.

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