Preparation Of Bottom Roughness Silver Nanowire Composite Electrode Based On HPMC

In recent years,Organic Light-Emitting Diode(OLED)has attracted more and more attention due to its advantages of light weight,low energy consumption and high efficiency.It has a wide range of applications in display and lighting fields.Flexible OLED is to prepare OLED light-emitting devices on flexible substrates,so that OLED can achieve flexible functions of bending and folding,and flexible OLED depends on the preparation of flexible electrodes.At present,the commonly used electrode material indium oxide(ITO),but it has many defects,such as bending,low price and so on,is not suitable for flexible electrode.Among many flexible electrode materials,silver nanowires(Ag NW)are the most promising alternative materials due to their excellent photoelectric properties and good bending properties.In this paper,the preparation of silver nanowire electrode was studied.By introducing polymer HPMC,the composite silver nanowire electrode was prepared,which not only achieved good photoelectric performance,but also improved the roughness and stability of the electrode.The specific work is as follows:(1)The basic preparation process of silver nanowire electrode prepared by spin coating method is introduced.Firstly,the dispersion effect of different solvents on silver nanowires was studied,and the effects of different silver nanowire solutions on the photoelectric properties of the electrodes were compared.Then,the effects of solution concentration,spin coating parameters,annealing temperature and other basic experimental parameters on the performance of silver nanowire electrode were studied.Furthermore,the dispersant hydroxypropyl methyl cellulose(HPMC)was introduced into the silver nanowire dispersion solution,which significantly reduced the agglomeration of silver nanowires and improved the dispersion of silver nanowire solution,and the silver nanowire electrode with excellent photoelectric performance was prepared.(2)The preparation of silver nanowire/HPMC composite electrode and its application in OLED were studied.The roughness of silver nanowire electrode is an important property that affects its application in OLED.In order to reduce the roughness of silver nanowire electrode,silver nanowire/HPMC composite electrode was prepared by spin-coating a layer of HPMC on the surface of silver nanowire electrode,and the effect of HPMC thickness on the electrode performance was studied.Then,a green light OLED device based on the composite electrode was fabricated.When the thickness of HPMC in the composite electrode is 56 nm,the brightness of the corresponding green light OLED device is 11380 cd/m~2,and good luminescence performance is obtained.(3)The preparation of silver nanowire:HPMC composite electrode and its application in OLED were studied.In order to further reduce the roughness of the silver nanowire electrode and improve the stability of the electrode performance,silver nanowires were mixed with high concentration HPMC in a certain proportion and spun to prepare silver nanowires:HPMC composite transparent electrode.The influence of the proportion of silver nanowires and HPMC on the electrode performance was studied.The results show that the preparation method of silver nanowires and HPMC composite electrode is simple,effective and reproducible.The embedded structure formed between silver nanowires and HPMC in the composite electrode can significantly reduce the surface roughness of the composite electrode and effectively improve the stability of the electrode on the condition that the electrode has good electrical conductivity and light transmittance.When Ag NW:HPMC=1:3,the electrode's roughness is only 4.6 nm,and the luminance and current efficiency of the OLED device prepared by this method are 25332 cd/m~2and 10.2 cd/A.