Preparation And Luminescence Sensing Properties Of Lanthanide Complexes/zeolite (Laponite) Hybrid Luminescent Materials

Lanthanide complexes display potential applications on many fields such as photoelectric,lighting,sensing,due to the integrity of unique optical properties such as sharp and characteristic emissions,and long excited state lifetimes.Yet,lanthanide complexes possess poor photo and thermal stability,which limit their practical application on many aspects.On the contrary,inorganic matrix,such as zeolite,silica,laponite etc,have good light stability and thermal stability.Therefore,encapsulation the complexes within the cavities of these inorganic matrix can integrate effectively the excellent luminescence properties of lanthanide complexes with good light and thermal stability of inorganic matrix.In this work,we mainly discuss the application of zeolite（or laponite）hybrid luminescence materials based on lanthanide complexes on small molecules sensing.Fistly,we report a simple and robust platform for detecting basic molecule based on the encapsulation of Eu³⁺-β-diketonate complexes within a nanozeolite L framework denoted as Eu³⁺（TTA_n）@NZL,and Eu³⁺（TTA_n）@NZL display high selectivity,fast response and good repeatability.This way provides a new direction for construction of novelty luminescence sensing material.Additionally,We encapsulate terbium-acetylacetonate complexes within the cavities of Y type zeolite（ZY）,which displays excellent selectivity and good sensitivity for ethylenediamine（En）vapor,which is probably caused by the interaction between En and acac.However,these luminescence sensors are only based on the luminescence intensity of single emissive transition,which suffers from variation of several factors like the detector concentration,excitation power,and the drifts of the optoelectronic systems such as lamps.Subsequently,we develop a luminescent platform based on the entrapment of Eu³⁺and Tb³⁺co-doped lanthanide complexes within nanozeolite L（NZL）channels,which brings about the categorization of amine solvents（amine with a larger pKb value and amine with a smaller pKb value）.Moreover,each of the amine solvents（with larger pKb values）has a unique characteristic readout of I_Eu/I_Tb,which makes an excellent fingerprint correlation between the amine solvents（with larger pKb values）and emission intensity ratio(I_Eu/I_Tb)achieved.This strategy can effectively overcome the shortcomings of single-emission transition,which lay a solid foundation for accurate and reliable small molecule sensing.Unfortunately,the identification of multi-analytes system remains a great challenge using the aforementioned luminescence sensor,because it adopt the‘‘lock-and-key’’principle requiring a highly specific interactions between the receptors and analytes.We demonstrate a sensing array through Eu³⁺,Tb³⁺and with Hexafluoroacetylacetonate（HFA）（selecting as ligand）co-doped zeolite Y（ZY）hybrid materials,accomplishing the identification of 13amine molecules through collective luminescence responses of these sensor elements affected by different amine molecules and data processing with Matlab.Moreover,this sensing array can achieve the detection of ammonia concentrations in water.Such a work offers a new direction for developing sensitive array sensing for multi-analytes systems.Compared with the rigid three-dimensional network structure of porous materials,synthetic nanoclay（LAPONITE^?）has emerged to be an good substance candidate because that its interlayer space can be adjusted by the guest specie,which is beneficial for the reaction.A simple detecting way is proposed to achieve the ratiometric detection of low-level water in organic solvents based on Eu³⁺,Tb³⁺,and acac co-doped Laponite.Such a luminescence detector represents excellent fingerprint correlation between water content in solvents and emission intensity ratio(I_Eu/I_Tb),and the variable emissive light colors of this sensor material is observed as water concentration in common organic solvents（MeCN,EtOH,and THF）increases（0%-5%v/v）clearly and directly with the naked eye.The approach should be a very promising strategy to achieve the low-content water detecting in organic solvents.