Comparing the luminescence processes of YVO<sub>4sub>:Eu and core-shell YVO<sub>4sub>@YF<sub>3sub> nanocrystals with bulk-YVO<sub>4sub>:Eu

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• 作者：L. Shirmane<sup>asup><sup> ; sup><sup>liana.shirmane@gmail.com" class="auth_mail" title="E-mail the corresponding authorsup> ; C. Feldmann<sup>bsup> ; V. Pankratov<sup>asup><sup> ; sup><sup>csup><sup> ; sup><sup>dsup><sup> ; sup><sup>vladimirs.pankratovs@oulu.fi" class="auth_mail" title="E-mail the corresponding authorsup><sup> ; sup><sup>vpank@latnet.lv" class="auth_mail" title="E-mail the corresponding authorsup><sup> ; sup><sup>vladimirs.pankratovs@maxiv.se" class="auth_mail" title="E-mail the corresponding authorsup>
• 关键词：YVO4 ; Eu3+ ; Nanophosphors ; Core-Shelled nanoparticles ; Luminescence ; Synchrotron radiation
• 刊名：Physica B: Physics of Condensed Matter
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：504
• 期：Complete
• 页码：80-85
• 全文大小：843 K

文摘

Comparative analysis of bulk, non-coated and core-shelled nanocrystalline YVO<sub>4sub>:Eu was performed by means of time-resolved luminescence and VUV excitation luminescence spectroscopy techniques. Nanocrystalline YVO<sub>4sub>:Eu samples &ndash; both as-prepared and YF<sub>3sub> core-shelled &ndash; have been synthesized by means of a microwave-assisted synthesis in ionic liquids, which allows to obtain 10&ndash;12&#xA0;nm nanoparticles with high crystallinity. The results show noticeable differences between bulk and nanocrystalline YVO<sub>4sub>:Eu in photoluminescence experimental data, which explains by influence of the nanocrystal surface. A YF<sub>3sub> core-shell layer around YVO<sub>4sub>:Eu nanoparticles partially recovers the intensity of the Eu<sup>3+sup> emission. It is demonstrated that the Eu<sup>3+sup> luminescence recovery is achieved at the expense of the suppression of the intrinsic emission but not due to the passivation of surface loss centers in core-shelled nanocrystals. It is also shown that surface loss processes are the reason of the degradation of energy transfer efficiency from the host lattice to Eu<sup>3+sup> under high-energy excitations in vacuum ultraviolet spectral range.