Design And Synthesis Of Blue Fluorescent/phosphineoxy White Rare Earth Materials Modified With Blue Fluorescent Molecules

Nowadays,white light material has become an important direction in the field of material exploration because of its many applications in organic lighting,display backlight and full color display.People use high-molecular,nano-materials,organic small molecules,metal complexes and rare earth complexes to build a lot of white light material.Rare earth complexes have attracted much attention because of their good luminescent properties.This is mainly because rare earth ions have the characteristics of high color purity,narrow emission band,long luminous life and spectral coverage of the area of the whole visible region.The use of materials in the synthesis of white materials has attracted the attention of everyone.Previously reported rare earth complex white material can be divided into two categories: one is MOFs(organic metal frame)white material or CPs(coordination polymer)white material.Most of these white materials are rare earth elements in the red-emitting europium ions or samarium ions in the form of blending blue-green MOFs or CPs to produce white light.Because of its low solubility,it is a good way to overcome the concentration-dependent and solvent-dependent problems,because of the low luminous efficiency of such materials,so greatly affected its application value.The second category is a single molecule white material.This kind of material is to use blue-green organic fluorescent molecules and red light of europium rare earth ions to produce white light conditions,that is,the balance of red,green and blue three primary colors,resulting in white light emission of materials.However,most of these materials only emit light in the liquid,and in the solid state of low fluorescence quantum yield limits its practical application.Therefore,the use of rare earth complexes to build high fluorescence quantum yield of white materials still face many challenges.Based on the above review,the design idea of this paper is to use the modification of 1,8-naphthalimide,tetraphenyl ethylene and pyrene of fluorescent molecules with high efficiency blue fluorescence quantum yield and to construct 5,which can coordinate with rare earth ions Different organic fluorescent ligands.Mainly by adjusting the fluorophore itself to have nitrogen or phosphine oxygen coordination sites,and then with ?-ketone sensitized rare earth europium ions coordination,by changing the distance between rare earth ions and fluorophores to control the complex The luminous color.The different fluorescent ligands synthesized 10 different complexes with lanthanide rare earth ions.We know that organic fluorophores can be achieved in the blue-green luminescence provided in the near-ultraviolet region,while the rare earth ions can provide red light,that is,adjust the complex blue-green light and red light intensity,to reach the appropriate ratio,White light will appear.This method not only avoids the shortcomings of monomolecular rare earth white materials,but also overcomes the low quantum yield of rare earth complexes of rare earth complexes of rare earth complexes,which opens up a kind of organic rare earth complex white light Novel method.