Visible‐Light Excited Luminescent Thermometer Based on Single Lanthanide Organic Frameworks
2016; Wiley; Volume: 26; Issue: 47 Linguagem: Inglês
10.1002/adfm.201603179
ISSN1616-3028
AutoresLiang Li, Yali Zhu, Xin‐Hui Zhou, Carlos D. S. Brites, Duarte Ananias, Zhi Lin, Filipe A. Almeida Paz, João Rocha, Wei Huang, Luís D. Carlos,
Tópico(s)Luminescence Properties of Advanced Materials
ResumoIsostructural lanthanide organic frameworks (Me 2 NH 2 ) 3 [Ln 3 (FDC) 4 (NO 3 ) 4 ]·4H 2 O (Ln = Eu ( 1 ), Gd ( 2 ), Tb ( 3 ), H 2 FDC = 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 H 2 FDC triplet excited state (17794 cm −1 ) and the 5 D 0 Eu 3+ 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 5 D 0 → 7 F 2 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).
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