Design,Preparation And Application Of Doped Room Temperature Phosphorescent Polymers Based On Organic Phosphine Salts

Pure organic room temperature phosphorescence(RTP)materials have unique long-lived excited state properties,and their luminescence color,lifetime and quantum efficiency can be significantly regulated by reasonable molecular design,which shows great application potential in the fields of information encryption,biological imaging,optical display and sensor parts.In recent years,organic room temperature phosphorescent polymers have attracted the attention of many researchers because of their good flexibility,ductility and low cost.At present,the main problems in this field are: single color of afterglow,poor water solubility and lack of new optical properties.In order to solve the above problems,a series of doped RTP polymer materials based on triphenylphosphine salt were designed and prepared,and their applications in the field of flexible organic optoelectronics were explored.Firstly,a series of water-soluble organic phosphine salts with different triplex energy levels were prepared by using phosphine ligands containing different conjugated groups.Then,the organic phosphine salt as the emitter and polyvinyl alcohol(PVA)as the matrix were co-doped to produce full-color afterglow polymers by precisely manipulating the concentration of the emitter.Secondly,by introducing organic phosphine salt with axial chirality signal as the emitter,the room temperature phosphorescent polymer with chirality was realized.Finally,based on their multi-color,long-life and circular polarization(CPL)characteristics,their applications in flexible display,anti-counterfeit encryption,temperature detection and CPL signal detection are realized.The main contents of this paper are as follows:1.Concentration dependent full-color room temperature phosphorescent polymerA series of triphenyl phosphine bromide derivatives with different substituents(F,Cl,Br and Py)were designed and synthesized as the emitters.Firstly,these triphenylphosphine salts with different monomolecular energy levels were doped with the PVA main material,and the blue and yellow long afterglow polymers were successfully prepared.Secondly,by using the highly distorted structure of the guest molecular space and the weak π-π interaction between adjacent molecules,the intermolecular electronic coupling effect can be effectively regulated by precisely controlling the doping concentration of the emitter in the PVA matrix,and the full-color organic room temperature phosphorescence can be further realized.Finally,using its colorful and thermochromic long life characteristics,information anti-counterfeiting and temperature detection applications were successfully developed.Therefore,the doped RTP polymer based on water-soluble guest provides important guidance for promoting the practical application of pure organic room temperature phosphorescent materials in many fields.2.Circularly polarized room temperature phosphorescent polymer based on binnaphthalene derivativesA series of synnaphthalene organic phosphonate derivatives(R/S/B-BDBPC3Br)with axial chiral signal were designed and prepared.The non-radiative transitions can be effectively suppressed by using PVA matrix.The polymer films with 1.0 % doping concentration have a luminescence lifetime of 644.95 ms and a phosphorescent quantum efficiency of 12.64 %.After excitation stops,a bright yellow afterglow emission of about 6 s can be observed.Secondly,based on the circularly polarized luminescence property of binaphthalene organophosphine salt,the circular dichroism(CD)spectrum of the doped film exhibits an obvious mirror image relationship with the CPL spectrum,and its maximum misalignment factor is.Finally,the CPL and long-life luminescence characteristics are used to develop a secure information encryption application for CPL response.