Preparation Of Silver Nanowire-based Flexible Transparent Conductive Films And Their Application In OLEDs

With the continuous advancement of science and technology,display technology is rapidly developing.Nowadays,screens are increasingly looking for thin,flexible,and active organic lighting.Flexible transparent conductive films(FTCFs)play an important role in flexible displays.Whether it's a classic liquid crystal display or today's popular active matrix organic light-emitting diode(AMOLED),TCF is still used with a fairly high transmission and conductive indium tin oxide(ITO)film.However,ITO's inherent brittleness and lack of indium elements greatly limit its application in new flexible devices.As a result,researchers are looking for candidate materials for FTCF,including silver nanowires(AgNWs),metal networks,carbon nanotubes(CNTs),and reduced graphene oxide(r GO).AgNWs is one of the most competitive materials to replace ITO films due to its good conductivity,significant optical transparency,excellent mechanical flexibility,and compatibility.First of all,in this work,the high purity silver nanowires with diameter about 50 nm and aspect ratio greater than 800 were synthesized by polyol method.The basic parameters of the synthesis experiment were determined by exploring the effects of PVP molecular weight,bromine ion concentration,and silver nanowire growth temperature on the growth morphology of silver nanowires.Subsequently,the prepared high aspect ratio silver nanowires were applied to transparent conductive films by spin-coating method,and the sheet resistance and transmittance of AgNW films were characterized.In order to further improve the photoelectric properties of the films,reduce the roughness of the films and enhance the mechanical stability of the films,we explored the post-treatment processes of high temperature annealing,mechanical pressing and the lamination of PEDOT:PSS,respectively,and discussed the effects of the three post-treatment processes on the photoelectric properties and surface morphology of the films.Based on the experimental results,the mechanism of the effect of the post-treatment process on the properties of the film was clarified.On the basis of the above experimental results,we combined AgNW with tannic acid(TA)modified SWCNTs(TCNTs),and introduced the mechanical pressing and the lamination of PEDOT:PSS post-treatment processes in the experiment,and constructed a high-performance TCNT/AgNW/P(3.0)TCF with a double-layer conductive network structure.The hybrid film can reach a sheet resistance of 9.2 ?/sq with a transmittance of 83.4% at 550 nm wavelength,and a low root mean square(RMS)roughness(approximately 3.8 nm).Finally,the prepared TCF is applied as an anode to OLED devices,and the photoelectronic performance of the devices are tested,and compared with OLED devices prepared using ITO TCF.The results show that the OLED with TCNT/AgNW/P(3.0)TCF as anode has the appropriate luminous performance as ITO anode preparation device,and confirms the good application prospect of TCF in OLED devices.