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


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).




Chemistry; Science & Technology - Other Topics; Materials Science; Physics


Li, L; Zhu, YL; Zhou, XH; Brites, CDS; Ananias, D; Lin, Z; Paz, FAA; Rocha, J; Huang, W; Carlos, LD

nossos autores


This work was supported by 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), the National Basic Research Program of China (973 Program) (2012CB933301). This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (Fundacao para a Ciencia e a Tecnologia, FCT, Ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC (Ministerio da Educacao e Ciencia) and when appropriate cofinanced by FEDER under the PT2020 Partnership Agreement. C.D.S.B. (SFRH/BPD/89003/2012) and D.A. (SFRH/BPD/95032/2013) thanks FCT for the postdoctoral grants.

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