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Color Tuning and White Light Emission via in Situ Doping of Luminescent Lanthanide Metal–Organic Frameworks

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posted on 06.01.2014 by Qun Tang, Shuxia Liu, Yiwei Liu, Danfeng He, Jun Miao, Xingquan Wang, Yujuan Ji, Zhiping Zheng
Isostructural lanthanide metal–organic frameworks (MOFs) are synthesized through the spontaneous self-assembly of H3BTPCA (1,1′,1″-(benzene-1,3,5-triyl)­tripiperidine-4-carboxylic acid) ligands and lanthanide ions (we term these MOFs Ln-BTPCA, Ln = La3+, Tb3+, Sm3+, etc.). Prompted by the observation that the different lanthanide ions have identical coordination environment in these MOFs, we explored and succeeded in the preparation of mixed-lanthanide analogues of the single-lanthanide MOFs by way of in situ doping using a mixture of lanthanide salts. With careful adjustment of the relative concentration of the lanthanide ions, the color of the luminescence can be modulated, and white light-emission can indeed be achieved. The mechanisms possibly responsible for the observed photophysical properties of these mixed-lanthanide MOFs are also discussed.

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