Formation mechanism and luminescence properties of nanostructured sodium yttrium fluoride corn sticks synthesized by precipitation transformation method

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• 作者：Li TIAN ((田 俐))^a ; ^b ; ^{tianli_cl@163.com" class="auth_mail" title="E-mail the corresponding author} ; Ruini ZHAO ((赵瑞妮))^a ; Jinjing WANG ((王金晶))^a ; Lin CHEN ((陈 琳))^a ; Jianrong XUE ((薛建荣))^a ; Qiuguo XIAO ((肖秋国))^a
• 关键词：precipitation transformation ; nanomaterials ; photoluminescence ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2015
• 出版时间：1 December 2015
• 年：2015
• 卷：33
• 期：12
• 页码：1246-1250
• 全文大小：1034 K

文摘

Monodisperse sodium yttrium fluoride corn sticks with hexagonal nanostructure were successfully prepared by a facile and repeatable precipitation transformation method. The phase and morphology of the products were characterized with X-ray diffraction (XRD) and scanning electron microscopy (SEM). The growth mechanism was studied, indicating that the initial generated Y(OH)₃ gradually translated into YF₃ and then transformed into corn stick-like H-NaYF₄ nanoparticles owing to the crucial role of fluorine ions in the solution. The up-conversion (UC) luminescence properties of H-NaYF₄:20%Yb³⁺,2%Er³⁺ nanocrystals were discussed. The intensive green emission in the range of 510–570 nm was attributed to the (²H_11/2, ⁴S_3/2)→⁴I_15/2 transition and the weaker red emission between 640 and 680 nm was originating from the ⁴F_9/2→⁴I_15/2 transition.