Color Tuning and White Light Emission via in Situ Doping of Luminescent Lanthanide Metal–Organic Frameworks TangQun LiuShuxia LiuYiwei HeDanfeng MiaoJun WangXingquan JiYujuan ZhengZhiping 2014 Isostructural lanthanide metal–organic frameworks (MOFs) are synthesized through the spontaneous self-assembly of H<sub>3</sub>BTPCA (1,1′,1″-(benzene-1,3,5-triyl)­tripiperidine-4-carboxylic acid) ligands and lanthanide ions (we term these MOFs <b>Ln-BTPCA</b>, Ln = La<sup>3+</sup>, Tb<sup>3+</sup>, Sm<sup>3+</sup>, 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.