Synthesis And Photophysical Property Of Luminescent Materials Containing Triphenylamine Unit

Organic luminescent materials have the advantages of good film formation,biocompatibility and stability,and have been widely used in biology,lighting and other fields.The emergence and application of new materials promote the progress of science and technology.Therefore,it is of great significance to develop new fluorescent materials.Red light in organic light-emitting materials is faced with serious aggregation quenching and low radiation transition ratio.Phosphorescent materials are faced with such problems as less room temperature phosphorescence system and short phosphorescence life.Triphenylamine is widely used as a donor in organic electrochromic,organic solar cell,organic electroluminescence,etc.In this paper,a series of new red light materials and room temperature phosphorescent materials were designed and synthesized respectively with triphenylamine as electron donor,and their optical physical properties were systematically studied,and their potential applications were explored as follows:1.The fluorescence materials emitted by red light have a wide range of functions in the fields of display lighting and biological imaging,and the development of new and efficient red light materials is of great practical significance.We designed TPA-3NDI and TPA-3NDIT containing trianiline and naphthalimide.The film emission of TPA-3NDI and TPA-3NDIT was red light emission at 644 nm and orange light emission at 570 nm,respectively.The aggregation behavior was studied using uv-visible absorption and fluorescence emission spectra of different solvents.The study showed that both molecules had charge transfer and aggregation induced luminescence properties.The thermodynamic test shows that the glass transition temperature of the two molecules is above 200 ?,which has good thermal stability.2.Phosphorescence emission has the characteristics of high exciton utilization rate,strong penetrability and high sensitivity to oxygen,showing high practical value in biological imaging,oxygen sensing,anti-counterfeiting and other fields.We designed and synthesized pure organic room temperature phosphorous materials with trianiline as the center,B-TPA,2B-TPA and 3B-TPA,with fluorescence emission peaks of 370 nm,416 nm and 416 nm,and phosphorescence emission peaks of 450 nm,520 nm and 520 nm,respectively.The phosphorescence life is millisecond and can reach up to 22 ms at room temperature.The attribution of other peaks in the phosphorescence spectrum was analyzed by time-resolution spectroscopy and life test.It is proved that the peaks of 370 nm and 420 nm in the delayed spectrum are phosphorescence emission,and the three molecules are all double phosphorescence emission.The reason of the double phosphorescence is analyzed,the long wavelength phosphorescence is closely related to the intermolecular forces in the crystal only in the crystal state,and the short wavelength belongs to the characteristic of the molecule itself,which always exists in the state of crystal and amorphous powder.This paper makes a preliminary exploration on the oxygen sensing of three molecules by using phosphorescence,and the results show that using phosphorescence to detect oxygen is a practical and effective method.