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Ag + -induced photoluminescence enhancement in lanthanide post-functionalized MOFs and Ag + sensing.
Physical Chemistry Chemical Physics : PCCP 2017 March 30
The robust gallium carboxylate Ga(OH)(btec)·0.5H2 O (MIL-61) is selected as a parent MOF to prepare Ln-MIL-61 by PSM. This work investigates the luminescence of Ln-doped MIL-61 (Ln = Eu3+ , Tb3+ , Sm3+ , Dy3+ ) in the visible light region. Upon 314 nm excitation, the emission spectra of Eu-MIL-61, Tb-MIL-61 and Eu/Tb-MIL-61 all exhibit their respective strong sharp emission bands. However, Sm-MIL-61 and Dy-MIL-61 show very similar emission to MIL-61 and almost no luminescence of Sm3+ and Dy3+ . In this work, the weak fluorescence of Sm3+ or Dy3+ doped MIL-61 is effectively sensitized by Ag+ . Besides, single-phase white-light emitters based on the resulting 4d-4f heterometallic co-doped MOFs can be realized. Furthermore, Sm-MIL-61 shows more highly sensitive and selective sensing towards Ag+ , and is a promising optical sensor for Ag+ detection in a few daily water samples.
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