Controlled synthesis and temperature-dependent spectra of NaYF₄:Yb³⁺, Re³⁺@NaYF₄@SiO₂ (RE = Er, Tm) core–shell–shell nanophosphors

详细信息    查看全文

• 作者：Y. Y. Bu ; X. H. Yan
• 刊名：Applied Physics B
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：123
• 期：2
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics, general; Physical Chemistry; Optics, Lasers, Photonics, Optical Devices; Quantum Optics; Engineering, general;
• 出版者：Springer Berlin Heidelberg
• ISSN：1432-0649
• 卷排序：123

文摘

The NaYF₄ Yb3+, Re3+@NaYF₄@SiO₂ (RE = Er, Tm) core–shell–shell nanophosphors were synthesized by thermal decomposition of lanthanide trifluoroacetate precursors and subsequent hydrolysis coating process. Structures of resulting nanophosphors are studied by the X-ray diffraction and high-resolution transmission electron microscopy. Temperature-dependent photoluminescence spectra, thermal quenching ratios, fluorescence intensity ratios, and temperature sensitivity of resulting nanoparticles are studied in the temperature range from 298 to 623 K. The results suggest that the NaYF₄:Yb3+, Er3+@NaYF₄@SiO₂ is a suitable candidate for making a low temperature sensor up to 450 K with a maximum sensitivity of 24 × 10−4 K−1, and the NaYF₄:Yb3+, Tm3+@NaYF₄@SiO₂ is an excellent candidate for temperature sensors at high temperature. This work presents a new method to use the fluoride nanocrystals as the optical thermometry at high temperature.