Preparation,Properties And Oxygen Sensing Application Of Selenium-Containing Purely Organic Probe Based On Room Temperature Phosphorescence

The detection of dissolved oxygen(DO)concentration can reflect the self-purification ability and pollution level of water.In addition,monitoring the concentration of oxygen in blood and tissues of human can reflect the health condition of human body.Oxygen sensors are widely used in many fields such as environmental monitoring,biomedicine,aquaculture and food science.At present,most of the oxygen detection methods have tedious operation steps,long detection time and low efficiency.Some of them can consume dissolved oxygen and fail to achieve real-time and rapid detection.Therefore,it is of great significance to develop efficient,rapid and sensitive oxygen detection material.At present,the commonly used luminescent oxygen sensing materials are fluorescence materials.Compared with fluorescence materials,phosphorescent materials have a longer luminescence life and are sensitive to oxygen,enabling time resolution detection and high detection sensitivity.The naphthalene anhydride group is an electron-withdrawing matrix molecule and has strong rigidity.When it was connected to different electronic group,the pure organic Room Temperature Phosphorescence(RTP)probes and its derivatives were synthesized.They do not contain heavy metals and environment friendly.Besides,the RTP probe has long lifetime excited state,strong light stability and simple synthesis process.The purely organic room temperature phosphorephose probe has many special photophysical properties.The maximum absorption wavelength is about 400 nm and maximum emission wavelength is about 600 nm,besides the phosphorescence life up to 50 ?s.Its derivatives have thermally activated delayed fluorescence(TADF)properties and the maximum emission wavelength is 420 nm,which is located in the blue light band.The heavy atom effect of Se atom increases the efficiency of intersystem crossing process and promotes phosphorescence.The oxygen concentration with the range of 0 to 100% can be detected in the solution.Combined with steady-state spectra and transient spectral data,the photophysical properties were characterized and the mechanism of room temperature phosphorescence was explained.