The Design/Synthesis And Properties Of Arylamine Organic Optoelectronic Materials

Aromatic amines are a very important type of organic functional materials for optoelectronic applications.These materials characterize with high hole mobility,strong fluorescence and good photo/thermal stability.They are widely used in organic photovoltaics?OPV?,organic light-emitting diodes?OLED?,organic field-effect transistors?OFET?and organic memory.This work focuses on the design and synthesis of new aromatic amines and studies their photoelectric properties.The detail work includes the following parts:Fristly,a new material,3,6,11,14-tetramethoxyphenylamine-dibenzo[g,p]chrysene?MeOPhN-DBC?has been designed and synthesized.This material shows good hole transport mobility,wide band gap,and high thermal/photo stability.When applied in inverted polymer OPV devices as anode buffer,significant improvement in performance was observed,e.g.,24.7%improvement in power conversion effdiciency?PCE?was achieved in device with 4 nm MeOPhN-DBC,compared to device with without MeOPhN-DBC.As demonstrated by photoluminescence,electrochemical impedance spectroscopy and the atom force microscopy,the insertion of MeOPhN-DBC inter layer can block exciton quenching and improve electrical conductivity of the device.On the other hand we also applied the new material in OLED device as anode buffer.Experiment shows that when 1 nm MeOPhN-DBC was inserted between the ITO and hole transport layer in OLED devices,the current efficiency and power efficiency increased by 44.6%and 14.0%,respectively,compared to device without it.Sencondly,a new fluorene core based triphenylamine derivative,9-ethyl-9-hexyloxy-2,7-dimethoxydiphenylamine-9H-fluorene?MeOPhN-FEH?has been design and synthesized.The material was studied by UV-vis absorption spectra,fluorescence spectra,electrochemical curves,thermogravimetric analysis and differential scanning calorimetry.Results show that MeOPhN-FEH has high hole transport mobility and wide band gap.When 4 nm MeOPhN-FEH was inserted between the active layer and MoO₃ to form double interfacial layers in inverted OPV devices,the PCE reaches 4.42%,improved 49.8%over the device without it.Thirdly,an amine derivative,4CzPyPyaPy was synthesized and studied.4CzPyPyaPy film was prepared and annealed at different temperatures?25^oC-120^oC?to study its thermal stability.It was demonstrated that there were no significant changes in the intensity and profile of the absorption and emission spectra of the 4CzPyPyaPy films,proving its excellent optoelectrical stability at high temperastures.Then mono-carrieier devices of 4CzPyPyaPy were fabricated and annealed at different temperatures?25^oC-120^oC?.Results show that the electron and hole currents are slightly increased at high temeprastures possibly due to the intramolecular?-?stacking enhancement induced by thermal energy.In addition,we fabricated blue emission OLED devices based on4CzPyPyaPy,firstly demonstrated blue emission from 4CzPyPyaPy.