Fig. 3From: MOF the beaten track: unusual structures and uncommon applications of metal–organic frameworks(Reproduced with permission from Ref. [48]. Copyright 2016 Wiley–VCH) a SEM image of shape-controlled HKUST-1; b–d photographs of luminescent lanthanide MOF (LnBTC) (BTC = 1,3,5-benzenetricarboxylic acid) superstructures under exposure of UV light with wavelength of 265 nm; b green TbBTC, c red EuBTC, d apricot heterolanthanide MOF (Eu:Ce:Tb = 25:20:55)Back to article page