Aqueous Synthesis And Luminescence Properties Of Lanthanide(Eu,Tb) Complexes/Clay Hybrid Luminescent Materials

Lanthanide complex organic-inorganic hybrid materials have the excellent photoluminescent properties of lanthanide complexes and good photo-/thermo-stability of inorganic matrix,which display important applications in the fields of optoelectronic devices and luminescence sensing.In recent years,with the increasing awareness of environmental protection,environmentally friendly preparation process of hybrid materials has become a general consensus.Therefore,it is a very significant topic to fabricate a new high-efficiency organic-inorganic hybrid material in environmentally friendly solvent(water).However,so far,few reports have been reported.In this work,we have constructed lanthanide complex-laponite(and aminoclay)hybrid luminescent material in aqueous medium.The main contents of this paper were listed as follows:1)Assemblying terbium(?) complexes and Rhodamine B dye(RhB)within the laponite interspaces to construct a new type of luminescent hydrogel Tb³⁺(Sal)-RhB/LP through in-situ formation and ion exchange method.And they display tunable luminescence colors by changing the concentration of Rhodamine B.This result is owing to the fluorescence resonance energy transfer from Tb³⁺-salicylic acid complex to Rhodamine B proved by the data analysis of UV-visible absorption spectroscopy and luminescnece spectra.And the highest energy transfer efficiency is 22.5%.2)A hydrophilics lanthanide complex hybrid materials Ln³⁺(TPA)/AC(Ln=Eu,Tb)were prepared by reacting Terephthalic acid(TPA)with AC in aqueous solution followed by coordinating with Ln³⁺.The quantum efficiency of the hybrid material in aqueous solution is as high as 17.82%.The above result is because that the coordination of aminoclay with lanthanide ions can be weaken the luminescence quenching by water molecules.Additionally,the hybrid materials also exhibit good luminescence stability under aqueous conditions.Moreover,the corresponding films prepared by the direct dropping method also exhibit good luminescent properties,which has potential application in the fields of photovoltaic devices and fluorescence sensing in the future.