Synthesis And Application Of Dual Mode Luminescent NaYF₄:Yb,Tm@Eu(DBM)₃phen Nanoparticles

The rare earth luminescent material has superior luminescent properties which is classified into up-conversion luminescence and down-conversion luminescence according to the luminescence mechanism.In the study of up-conversion materials,NaYF4 is an ideal matrix material due to simply synthesis method,low phonon energy and stable chemical properties which is widely used in many fileds.In the study of down-conversion rare earth materials,Eu3+is one of the most widely used luminescent ions.In the current research on rare earth luminescent materials,most of them are about the synthesis of a single rare earth up-conversion or down-conversion luminescent material.There are few studies on the combination of this two to prepare dual-mode luminescent nanomaterials.Based on the these background,this paper synthesized a novel NaYF4:Yb,Tm@Eu(DBM)3phen nanoparticle with dual-mode luminescence properties,and systematically explored the application of nanoparticles.The NaYF4:Yb,Tm nanoparticles were synthesised by solvothermal method.And the surface of the nanoparticles was modified with mesoporous SiO2 to prepare NaYF4:Yb,Tm@mSiO2 nanoparticles.Mesoporous pore size of these nanoparticles is 3.7 nm.The Eu(DBM)3phen complexes were synthesized by using Eu3+as luminescent ion and dibenzoylmethane(DBM)and phenanthroline(phen)as ligands.NaYF4:Yb,Tm@mSiO2 nanoparticles and Eu(DBM)3phen were mixed,and then Eu(DBM)3phen complexes were entered into the SiO2 mesoporous structuredue to the electrostatic force.Thereby NaYF4:Yb,Tm@Eu(DBM)3phen nanoparticles were finally obtained.The luminescence properties of the synthesized particles were tested.At 980 nm and 349 nm excitation wavelengths,the nanoparticles produced characteristic emission of Tm3+ and Eu3+,respectively,showing the characteristics of dual-mode luminescence.The reaction conditions were optimized.The morphology of the synthesized particles was characterized by transmission electron microscopy.The results show that the synthesized nanoparticles are sphere with a particle size of about 50 nm.The luminescence resonance energy transfer system between NaYF4:Yb,Tm@Eu(DBM)3phen and sunset yellow was established on this research.Based on this,an analytical method for the determination of sunset yellow by fluorescence method was established.The linear range of the method is 4.52×10-5 g·L-1?4.52×10-3 g·L-1 with the detection limit of 8×10-6 g·L-1.Using this method,the content of sunset yellow in a sports drink was determined to be 0.029 g·kg-1.The recoveries were 98.7?106%,indicating that the analytical method was accurate and reliable.Fe3+ can effectively quench the luminescence of NaYF4:Yb,Tm@Eu(DBM)3phen nauoparticles.Based on this,an analytical method for the determination of Fe3+ was established.The linear range of Fe3+was 6.00×10-7 mol·L-1?6.00×10-5 mol·L-1,and the detection limit was 1.7×10-7 mol·L-1.The content of Fe3+ in tap water was determined to be 0.0229 g·L-1 by this method.The recovery rate was 97.1?106%,indicating that the analytical method was accurate and reliable.