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NIR-Fluorescent Hybrid Materials of Tm<sup>3+</sup> Complexes Carried by Nano-SiO<sub>2</sub> via Improved Sol–Gel Method
oleh: Yanxin Wang, Qiuyu Sun, Linjun Huang, Peng Lu, Xiaozhen Wang, Zhe Zhang, Yao Wang, Jianguo Tang, Laurence A. Belfiore
Format: | Article |
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Diterbitkan: | MDPI AG 2020-10-01 |
Deskripsi
Tm<sup>3+</sup> has obvious emission characteristics in the near-infrared band. Thulium ions combined with different organic ligands lead to different fluorescent properties. In the near-infrared region, Tm<sup>3+</sup> is a down-conversion fluorescent material that is unstable under high temperature and acidic conditions. Moreover, in those complex environments, the fluorescence from Tm<sup>3+</sup> complex is usually degraded. In this work, two kinds of near-infrared fluorescent complexes, Tm(TTA)<sub>3</sub>phen and Tm(DBM)<sub>3</sub>phen, were prepared, and the intensity of their fluorescence is compared. The fluorescence intensity at 802 nm is greatly improved compared with Tm(TTA)<sub>3</sub>phen, and the intensity of the emission at 1235 nm and 1400–1500 nm is also enhanced. Moreover, the emission lifetime of SiO<sub>2</sub>-Tm(TTA)<sub>3</sub>phen is 50.38 μs. Tm(TTA)<sub>3</sub>phen complex and SiO<sub>2</sub>-Tm(TTA)<sub>3</sub>phen hybrid materials have better fluorescence than Tm(DBM)<sub>3</sub>phen and SiO<sub>2</sub>-Tm(DBM)<sub>3</sub>phen. Therefore, HTTA is a better choice of organic ligands for Tm<sup>3+</sup>. The NIR-fluorescent hybrid materials prepared have stronger fluorescence after combining with nano-SiO<sub>2</sub>compared with pure Tm<sup>3+</sup> complexes, and have stronger structural stability compared with pure nano-SiO<sub>2</sub>.