Low-Temperature Fluorination Route to Lanthanide-Doped Monoclinic ScOF Host Material for Tunable and Nearly Single Band Up-Conversion Luminescence

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• 作者：Yonggang Wang ; Ting Wen ; Huina Zhang ; Jing Sun ; Miao Zhang ; Yanzhen Guo ; Wenjiao Luo ; Mingjun Xia ; Yingxia Wang ; Baocheng Yang
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：May 15, 2014
• 年：2014
• 卷：118
• 期：19
• 页码：10314-10320
• 全文大小：471K
• 年卷期：v.118,no.19(May 15, 2014)
• ISSN：1932-7455

文摘

Lanthanide upconversion (UC) materials that convert near-infrared excitations into visible emissions are of extensive current interest owing to their potential applications in biosensing, 3D displays, and solar cells. A wise choice of the host lattice is crucial for high-quality UC luminescence with desired emission wavelengths. From the viewpoint of structural chemistry, here we propose monoclinic scandium oxyfluoride (M-ScOF) as a promising UC host material for the following reasons: (1) the shortest Sc³⁺鈥揝c³⁺ distance (3.234 脜, versus 3.584 脜 of Y³⁺鈥揧³⁺ in hexagonal NaYF₄); (2) the unique crystallographic site of Sc in the structure; (3) specific coordination environment of Sc with 4O + 3F in C₁ symmetry. Lanthanide doping in an individual host with such structural features is highly expected to achieve single band emission and fast energy migration for high-efficiency UC process. Experimentally, we employ a low temperature fluorination method to synthesize pure and lanthanides doped M-ScOF samples successfully by using polytetrafluoroethylene as the fluridizer. The Yb³⁺/Ho³⁺-codoped M-ScOF nanoparticles exhibit tunable UC emissions with various red/green ratios under excitation of 位_ex = 980 nm. Nearly single-band red (660 nm) and near-infrared (805 nm) UC luminescence have been achieved in Yb³⁺/Er³⁺- and Yb³⁺/Tm³⁺-incorporated samples, respectively. We believe that more attention to M-ScOF and the search for other advanced host materials based on structural chemistry perspective will greatly boost the development of high-efficiency UC phosphors in various applications such as bioprobes and chromatic displays.