Preparation Of Flexible Transparent Conductive Film And Its Application In OLED Devices

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.Transparent conductive film(TCF)is an important component of display screens.Whether it is a classic liquid crystal display or a popular active matrix organic light emitting diode(OLED),the TCF used is still the ITO film.The ITO film has excellent electrical conductivity,good light transmittance,low surface roughness,and good stability.However,the ITO film has the disadvantage of being inherently brittle,and it is difficult to satisfy the future development of the display screen.Therefore,the development of new flexible TCF with excellent performance has become a problem we must solve today.Carbon nanomaterials(carbon nanotubes(CNT),graphene)are nanomaterials with good mechanical propertie and photoelectric propertie,and have become one of the materials with good development prospects for the preparation of flexible TCF.Firstly,this paper studied the mechanism of HNO3 post-treatment of pure carbon nanotube film(CNT-TCF).HNO3 contains H+and NO3-.In order to determine exactly which ion plays a key role in reducing the sheet resistance of CNT-TCF,we have selected two other reagents,NaNO3 contains NO3-,and HCl contains H+.Two reagents were compared to the HNO3 treatment mechanism.In HNO3,H+has a strong acidity,and NO3-has a strong oxidizing property.Finally,it is concluded that HNO3 has strong acidity and strong oxidizability,and has a strong interaction with CNT,so that the non-conductive dispersant sodium dodecylbenzene sulfonate(SDBS)is easily removed,reducing the contact resistance between CNT.Thereby reducing the sheet resistance of CNT-TCF.Secondly carbon nanomaterial and conductive polymer were used to prepare a TCF with good electrical conductivity and transparency.poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)is a highly conductive polymer with satisfactory light transmittance.We have prepared a sandwich-structured TCF(CNT/PEDOT:PSS/CNT-TCF)by spraying a simple and low cost method.The addition of polar solvent increases the conductivity of the film and further investigates the effect of different polar solvents on the properties of the film.According to the experimental results,the addition of ethylene glycol and HNO3 treatment resulted in better conductivity and transmittance of the TCF.A TCF having a sheet resistance of 95.15 Ω/sq and a transmittance of 87.72%was obtained.Once more,a TCF with strong adhesion and excellent electrical conductivity was prepared by using graphene oxide and PEDOT:PSS.The adhesion factor of the film was measured to be maintained above 0.9.Graphene oxide is a chemically modified graphene material that contains oxygen-rich functional groups which impart many unique physicochemical properties to graphene oxide.Moreover,the presence of graphene oxide enhanced the hydrophilicity of the film,and it is easier to spin-coat on the film when preparing the device.Finally,two kinds of TCF were prepared as anodes to prepare OLED devices.The photoelectric properties of the devices were tested.The result show that the prepared films have good application prospects in optoelectronic devices.