The highly luminescent MOFs_(∞)^(3)[Ce(Im)_(3)ImH]·ImH,_(∞)^(3)[Tb(Im)_(3)],and the dense framework_(∞)^(3)[Sr_(0.95)Eu_(0.05)(Im)_(2)](Im−=imidazolate-anion,C_(3)N_(2)H_(3)^(−))were grown on nanostructured ma...The highly luminescent MOFs_(∞)^(3)[Ce(Im)_(3)ImH]·ImH,_(∞)^(3)[Tb(Im)_(3)],and the dense framework_(∞)^(3)[Sr_(0.95)Eu_(0.05)(Im)_(2)](Im−=imidazolate-anion,C_(3)N_(2)H_(3)^(−))were grown on nanostructured macroporous aluminium oxide(AAO)membranes.Thereby,luminescent coatings on the membranes were achieved.Three different growth processes unusual for MOFs were investigated and compared:a film growth process in situ to MOF formation from the linker melt,electride induction with solvated electrons,and chemical vapour deposition(CVD)to additionally utilize the gas phase.Deposition from the organic melt has proved to be a fast approach to achieve various film thicknesses of the luminescent frameworks.The electride-based approach offers excellent homogenization at an atomic level for the highest quantum yields of QY>90%for_(∞)^(3)[Sr_(0.95)Eu_(0.05)(Im)_(2)]including the formation of barite rose analogous crystals prior to growth of a complete film on AAO membranes.For_(∞)^(3)[Tb(Im)_(3)]and_(∞)^(3)[Ce(Im)_(3)ImH]·ImH,deposition of bundles of crystals by CVD on AAO is possible while also maintaining the luminescence of the original MOFs but without complete layers.In order to elaborate the divalent character of europium,being the basis of the high efficiency of the luminescence,EPR studies were carried out on_(∞)^(3)[Sr_(1−x)Eu_(x)(Im)_(2)],x=0.01,0.05 and 1.展开更多
基金support of the Deutsche Forschungsgemeinschaft within the priority program SPP-1362“MOFs”.
文摘The highly luminescent MOFs_(∞)^(3)[Ce(Im)_(3)ImH]·ImH,_(∞)^(3)[Tb(Im)_(3)],and the dense framework_(∞)^(3)[Sr_(0.95)Eu_(0.05)(Im)_(2)](Im−=imidazolate-anion,C_(3)N_(2)H_(3)^(−))were grown on nanostructured macroporous aluminium oxide(AAO)membranes.Thereby,luminescent coatings on the membranes were achieved.Three different growth processes unusual for MOFs were investigated and compared:a film growth process in situ to MOF formation from the linker melt,electride induction with solvated electrons,and chemical vapour deposition(CVD)to additionally utilize the gas phase.Deposition from the organic melt has proved to be a fast approach to achieve various film thicknesses of the luminescent frameworks.The electride-based approach offers excellent homogenization at an atomic level for the highest quantum yields of QY>90%for_(∞)^(3)[Sr_(0.95)Eu_(0.05)(Im)_(2)]including the formation of barite rose analogous crystals prior to growth of a complete film on AAO membranes.For_(∞)^(3)[Tb(Im)_(3)]and_(∞)^(3)[Ce(Im)_(3)ImH]·ImH,deposition of bundles of crystals by CVD on AAO is possible while also maintaining the luminescence of the original MOFs but without complete layers.In order to elaborate the divalent character of europium,being the basis of the high efficiency of the luminescence,EPR studies were carried out on_(∞)^(3)[Sr_(1−x)Eu_(x)(Im)_(2)],x=0.01,0.05 and 1.
