The Synthesis Of New Lanthanide Complexes And Their Application As Luminescent Sensor

Lanthanide ions have unique optical,electrical and magnetic properties and fluorescence properties of with excellent emission of narrow band,high color purity,long-lived excited states,which has potential applications in luminescence,display,fluorescent sensing fields.In recent years,many lanthanide complexes with good luminescent properties have been applied to fluorescence sensors.Owning to the luminescent behavior of lanthanide complexes with exceptional sensitivity,high selectivity and noise immunity,fluorescence sensors based on lanthanide complexes have gradually become an important research tool in chemistry,life science,preclinical medicine and environmental detection.At present,a large number of lanthanide fluorescence sensors have been used to sensing the temperature,anions and cations in environment and explosive molecules.However,initial lanthanide sensors mostly focused on the luminescence behavior of a single rare-earth element,which is inevitably susceptible to errors owing to changes in probe concentration,excitation or detection efficiency,and the lack of a reference material.In view of the above problems,several novel complexes co-doping of rare earth and rare earth/lanthanide and transition metals were prepared,and the temperature and anion fluorescence sensing behavior of ratiometric fluorescence sensor were studied.The ratiometric fluorescence sensor not only can effectively avoid external interference,but also can save the rare earth elements.The main content of this paper is divided into the following parts:1.We design and synthesize the fabrication of a sensitive ratiometric and colorimetric luminescent thermometer with a wide operating-temperature range,from cryogenic temperatures up to high temperatures（80-410 K）,through the combination of lanthanide and transition metal complexes.Benefiting from the transition metal complex as a self-reference,the lanthanide content in the mixed-coordination complex,Eu_0.05（Mebip-IL）_0.15Zn_0.95（Mebip-IL）_1.9,was lowered to 5%.2.We synthesized a new organic ligand consisting of a terpyridine unit and benzenetricarboxamide moieties（Terp-TMC）.Terpyridyl can sensitize europium and terbium luminescence,and luminescence range of it located in the blue region.Multicolored photoluminescence as well as white-light emission of Terp-TMC-Eu_xTb_y were occasionally observed by changing various parameters such as the molar ratio of Eu³⁺to Tb³⁺,excitation wavelength.3.The solid state of Terp-TMC-Eu_xTb_y is dissolved in DMF solution,and a series of solution with adjustable luminous color can be obtained.We analyzed a strong response in the emission property of Terp-TMC-Eu₁Tb₁ complex,which are caused by H₂PO₄^- ion.Lanthanide complexes with both coordinated interaction and potential hydrogen- bonding-accepting site,can be explored as a ratiometric fluorescence sensor showed high selective fluorescence sensor behavior for H₂PO₄^-ion.4.A series of Yb³⁺complex doped PMMA thin films were prepared,which can convert UV and visible light to near-infrared light centered at 980 nm through the energy transfer from organic antenna molecules to Yb³⁺ion.The film is expected to be used as surface coating materials on silicon solar cell,which can improve the utilization rate of silicon solar cells to ultraviolet light by down conversion.