Study On Preparation And Applications Of Pure Organic Phosphorescence Source And Long Afterglow Carbon Dots

It is well known that phosphorescence,a hot carbon-based material nowadays,is widely used in various industries.However,how to develop phosphorescent carbon dots with universality and non-toxicity has been troubling researchers.The insufficiency of effectively activating purely organic phosphorescence has greatly limited the development and application of purely organic phosphors.Herein,amorphization of purely organic phosphors into carbon dots(C-dots),namely,amorphization strategy,was designed for activating matrix-free room-temperature phosphorescence(RTP)of C-dots.Using citric acid and 2,4,6-trihydrazinyl-1,3,5-triazine(THT)as precursors,the obtained C-dots reserved the ordered structure similar to a THT single crystal in the interior of C-dots.The doped triazine overing is critical for RTP;it not only provides the n-?~* transition center but also plays a key role in facilitating the intersystem crossing.The weak interactions among THT molecules,such as ? ··· ? stacking and hydrogen bond interactions,and the hydrogen bond among functional groups in the interior of C-dots,together with the steric hindrance formed by polymer-like structures of C-dots,served as matrices to embed and immobilize the emissive center,resulting in the afterglow with a lifetime of 66.4 ms.C-dot-based RTP was successfully used for digital encryption,information protection,and antibacterial protection.Most importantly,the universality of the amorphization strategy provided a simple and advantageous pathway for the activation of C-dot-based matrix-free RTP.Furthermore,in the part of three,we propose a new opinion:Compare the effect of different substituent groups on the phosphorescence of carbon dots by horizontal comparison.In this way,we can get the phosphorescence mechanism that we need to verify.The first step is the synthesis of p-phenylboronic acid and its fluorine-substituted and methoxy-substituted compounds,and then the systematic characterization and detection of these carbon points are carried out.Due to the amorphous structure of phenylboronic acidlike carbon dots,the carbon dots we synthesized often have certain phosphorescent properties.For the application part of carbon dots,explorations on encryption and decryption,digital coding and glucose detection have been done,and the experimental results are presented in later sections.Like most carbon dots possessing phosphorescent properties,the application prospects of our benzeneboronic acid-like carbon dots are vastly promising.