Design,Synthesis And Characterization Of Pure Organic Luminescence Based On Benzophenone

Pure organic luminescence materials play a crucial role in human beings daily life.They have been widely used in organic light-emitting diodes?OLEDs?,bioimaging,chemical and biological sensors and so on.Benzophenone?BP?shows room temperature phosphorescence property?CIP?,indicating its high inter-system crossing.BP is a potential material with aggregation induced emission?AIE?feature,due to its highly twisted conformation.Through coupling or reacting with other molecules we may obtain compounds with different properties,such as AIE,mechanochromic,room temperature phosphorescence and gelation.Thus,in this thesis,in order to obtain high efficiency luminogens,we used benzophenone as the raw materials to synthesize a series of compounds.We studied their photophysical properties,aggregation state structure and application performance in OLED and OFET systematically.Specific studies as follows:BP2DPA and its coupling product 4TPAE were successfully designed and synthesized.BP2DPA exhibits mechanochromic and room temperature phosphorescence properties.However,it hasn't been systematically studied.In contrast to the aggregation caused quench?ACQ?behaviors of TPA derivatives like TPA,DTPA and 3TPAB,4TPAE boosts its emission in the aggregated state,while no emission was observed in its solution,suggesting its AIE feature with a high solid-state efficiency up to unity.The emission color changes in response to external mechanical stimuli such as grinding,however,it can recovery through heating or fuming,associated with the transitions between its crystalline and amorphous states,exhibiting typical mechanochromic properties.The OLED devices of4TPAE with NPB as its hole hole-transporting layer performs well with maximum luminance,current,power and external quantum efficiencies(L_max,CE_max,PE_max,and EQE_max)of 14550 cd m^-2,11.7 cd A^-1,8.1 lm W^-1and 3.5%,respectively.However,the devices without NPB layer perporms even better,giving a L_max,a CE_max,a PE_max,and an EQE_max of7575 cd m^-2,12.2 cd A^-1,6.4 lm W^-1 and 4.9%,respectively.What's more,the field-effect mobility of 4TPAE in OFET devices reach 4.43×10^–4 cm²V^–1s^–1 which is impressive among twisting structures and efficient solid-state emitters.These results clearly suggest 4TPAE owning high hole mobility and efficient solid-state emission.We designed and synthesized a metal-and heavy-atom free pure organic luminogen with tert-butyl groups,DtBuCZBP,which is ready to form organogels in DMSO.It emits prompt and delayed fluorescence,as well as room temperature phosphorescence,namely dual emission in crystalline solids,gels and polymeric films.To the best of our knowledge,it is the first example of metal-and heavy-atom free pure organic gelator with RTP emission.Such unique RTP and moreover dual emission properties in different states make DtBuCZBP a potential material for diverse applications.