Preparation And Performance Of Polymer-based Phosphorescent Materials

Great attention has been paid to organic phosphorescent materials owing to their unique radiation mechanism with excellent long-life emission and large Stokes shift.Organic phosphorescent materials show potential application value in the fields of bioimaging,sensors,optoelectronic materials,and anti-counterfeiting.However,due to the inherent weak spin-orbit coupling(SOC),fast intersystem crossing(ISC)processes and multiple deactivation pathways of organic molecules,the preparation of long-life pure organic phosphorescence still a challenge.In order to achieve long-life and high-performance organic phosphorescence,several strategies including crystallization,deuterium substitution,metal complexation,have been reported.The disadvantages of complex preparation,heavy metal pollution and complicated synthesis routes,limited their wide applications.In recent years,the research on polymer-based room-temperature phosphorescent materials has become a research hotspot.However,to some extent,the disadvantages of complex synthesis routes and short lifetimes in the reported organic polymer-based room-temperature phosphorescent materials,limited their development.The main contents are summarized as follows:1.Polymer-based room-temperature phosphorescent materials PAM/CBA were prepared using 4-carboxyphenylboronic acid as the guest and polyacrylamide(PAM)as the main body for doping strategy,which could emit phosphorescence under ambient conditions.PAM/CBA exhibited excellent room-temperature phosphorescent property.The photophysical properties of PAM/CBA were investigated by phosphorescence spectroscopy and lifetime decay spectroscopy.The results indicated that the hydrogen bonding network played an important role in the realization of room temperature phosphorescence by PAM/CBA.Furthermore,its application in information coding provided a new preparation idea and strategy for information anti-counterfeiting.2.Sulfonic acid-based small molecule p-aminobenzenesulfonic acid(ABSA)was doped in polyacrylamide(PAM)to prepare the complex PAM/ABSA.PAM/ABSA showed room-temperature phosphorescence(RTP)emission,and different mole ratio of AM to ABSA for the influence of RTP were investigated.Sulfonic acid functionalized copolymer PAMABS were synthesized by radical copolymerization of AM with monomer of sulfonic acid.PAMABS also showed RTP.Phosphorescence spectroscopy and lifetime decay spectroscopy were used to study the luminescence properties of PAM/ABSA and PAMABS.PAMABS exhibited color tunability.Furthermore,the preliminary study on information encryption was carried out using PAM/ABS and PAMABS.3.The ternary organic polymer-based phosphorescent material PAM/ABSA/Rh B,which could achieve secondary delayed fluorescence,was prepared by modifying the polymer system PAM/ABSA with rhodamine B(Rh B)based on polymer modification strategy.Their luminescence properties were studied by phosphorescence spectroscopy and lifetime decay spectroscopy.The other organic polymer phosphorescent material PAM/ABSA/Fl was also prepared using fluorescein(Fl)as the modification reagent by the same doping strategy.PAM/ABSA/Rh B could achieve secondary delayed fluorescence emission and show potential application value in information anti-counterfeiting...