Preparation And Properties Of Triphenylamine Of Host-Guest Doped Pure Organic Room-Temperature Phosphorescence Materials

Phosphorescence has delayed luminescence,which makes it widely used in biological imaging,information encryption,photoelectric devices.Compared with metal organic room temperature phosphorescent(RTP)materials,pure organic room temperature phosphorescent materials have more research significance.Organic room-temperature phosphorescent materials focus on the improvement of phosphor life and phosphor quantum yield.In recent years,phosphorescent materials have developed rapidly,but in general,the development of pure organic long-life and high quantum yield phosphorescent materials still can not meet the market demand.The molecular design and the preparation method of materials are particularly important to the phosphorescent properties.Based on this,in this paper,different functional groups and doping methods are introduced into the molecules to prepare materials with long phosphor life.This paper hostly consists of the following two parts:Firstly,Vilsmeier-Haack reaction was used to synthesize Br-TPA-CHO(Guest-1),2Br-TPA-CHO(Guest-2),Br-TPA-2CHO(Guest-4)and TPA-3CHO(Guest-5)molecules,and TPA-3Br(Guest-3)was doped into the host molecule TPA with different mass ratios to prepare five kinds of materials.The photophysics test showed that the best doping ratio was 2 : 100,and all doping systems except Guest-1&Host had phosphorescent emission properties.Guest-3&Host system has the strongest phosphorescence emission intensity,and Guest-5&Host system has the longest phosphorescence life.The mechanism of phosphorescence generation and electron transfer pathway were verified by further tests and theoretical calculations.Finally,it is concluded that both Br and aldehyde groups can enhance the phosphorescent properties of the doping system,and Br hostly affects the phosphorescent intensity of the material,while aldehyde group hostly affects the phosphorescent life of the material.Secondly,the small molecule doping system(Guest-3&Host and Guest-4&Host)and small molecules(Guest-4)were doped into the polymer matrix to enhance the phosphorescent properties of the original system.The best doping ratio was determined to be 2 to 10 mass ratio and the most suitable polymer matrix was PVA.The good dispersion state of the molecule in the polymer was proved by optical test.The afterglow time of polymer doping system can be extended to 3.6 s.It is concluded that the host polymer matrix has more advantages than small molecules in limiting the non-radiative transition of electrons.