Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 26, Issue 47, Pages 8677-8684Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201603179
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Funding
- Natural Science Foundation of Jiangsu Province [BM2012010]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) [YX03001]
- Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP) [20113223110005]
- National Basic Research Program of China (973 Program) [2012CB933301]
- project CICECO-Aveiro Institute of Materials [POCI-01-0145-FEDER-007679]
- Fundacao para a Ciencia e a Tecnologia, FCT) [UID/CTM/50011/2013]
- national funds through the FCT/MEC (Ministerio da Educacao e Ciencia)
- FEDER
- FCT [SFRH/BPD/89003/2012, SFRH/BPD/95032/2013]
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Isostructural lanthanide organic frameworks (Me2NH2)(3)[Ln(3)(FDC)(4)(NO3)(4)]center dot 4H(2)O (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 D-5(0) 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 D-5(0)-> F-7(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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