Visible-Light Excited Luminescent Thermometer Based on Single Lanthanide Organic Frameworks

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• 作者：Liang Li ; Yali Zhu ; Xinhui Zhou ; Carlos D. S. Brites ; Duarte Ananias ; Zhi Lin ; Filipe A. Almeida Paz ; Joã ; o Rocha ; Wei Huang and Luí ; s D. Carlos
• 刊名：Advanced Functional Materials
• 出版年：2016
• 出版时间：December 20, 2016
• 年：2016
• 卷：26
• 期：47
• 页码：8677-8684
• 全文大小：1713K
• ISSN：1616-3028

文摘

Isostructural lanthanide organic frameworks (Me₂NH₂)₃[Ln₃(FDC)₄(NO₃)₄]·4H₂O (Ln = Eu (1), Gd (2), Tb (3), H₂FDC = 9-fluorenone-2,7-dicarboxylic acid), synthesized under solvothermal conditions, feature a Ln-O-C rod-packing 3D framework. Time-resolved luminescence studies show that in 1 the energy difference between the H₂FDC triplet excited state (17794 cm⁻¹) and the ⁵D₀ Eu³⁺ level (17241 cm⁻¹) is small enough to allow a strong thermally activated ion-to-ligand back energy transfer. Whereas the emission of the ligand is essentially constant the ⁵D₀→⁷F₂ intensity is quenched when the temperature increases from 12 to 320 K, rendering 1 the first single-lanthanide organic framework ratiometric luminescent thermometer based on ion-to-ligand back energy transfer. More importantly, this material is also the first example of a metal organic framework thermometer operative over a wide temperature range including the physiological (12-320 K), upon excitation with visible light (450 nm).