Preparation And Research Of Flexible Ac-electroluminescent Textiles

As an important part of smart wearable textiles,flexible electroluminescent(EL)textiles have a huge prospect due to the wide applications in intelligent display devices,decoration clothing for stage performance,protective clothing as well as interior design.The application prospects of EL textiles in the field of smart wearable devices is influenced by the durability,luminescent and mechanical properties of the devices,which were determined by the material and structure of EL devices.Therefore,it is necessary to study the performance of EL devices in terms of material selection,structure design,and manufacturing processes.In this study,based on the principle and structure of the inorganic alternating current electroluminescence(ACEL)system,the pristine fabric-based inorganic ACEL textile and conductive fabric-based inorganic ACEL textile were manufactured by selecting appropriate electrodes and functional materials to explore a proper structure and manufacturing process of the EL devices.The luminescence and mechanical properties of ACEL textile devices were characterized,demonstrating excellent luminescence and mechanical properties,luminescence and mechanical stability,which meets the luminescence and wearability performances required in the smart wearable field.In this study,the pristine fabric-based ACEL textile with good properties was prepared by blade coating and brush coating methods.During the preparation process,satin fabric with smooth surface was used as the substrate;conductive silver paste was used as the bottom electrode;a mixture of Ba TiO3 powders and water polyurethane(WPU)was prepared as the dielectric layer;the mixture of WPU and phosphor composed of Zn S:Cu was used as phosphor layer;and the transparent conductive polymer PEDOT:PSS was used as the top electrode.The pristine fabric-based inorganic ACEL textile with the best luminous performance can be prepared when the mix ratio of phosphor to WPU was 2:1 and the thickness of phosphor layer was 90 ?m.When the fabric-based inorganic ACEL textile was driven under the AC power of 90 V,2000Hz,the luminous illumination of it can reach 137.56 Lux.Besides,it can still maintain a good working condition after 6 hours of work,exhibiting the illuminance value of 83.01 Lux,which was reduced by about 37.94%.After repeated bending for 1000 times,it can still work with good performance with an illuminance value only reduced by 14.43%.In addition,the device still maintained good luminescence performance after being immersed in deionized water for 6 hours,as the brightness was only slightly decreased with a loss rate of 6.97%.After that,the conductive fabric-based ACEL textile with simpler and more integral structure was prepared by using the ultra-thin copper-nickel conductive cloth as the substrate and the bottom electrode.Similarly,when the mix ratio of phosphor to WPU was 2:1 and the thickness of phosphor layer was 90 ?m,the conductive fabric-based ACEL textile also showed excellent performance which is comparable to the pristine fabric-based ACEL textile.When the conductive fabric-based inorganic ACEL textile was driven under the AC power of 90 V,2000Hz,the illuminance can reach 123.39 Lux,and it can maintain good performance after continues working for 6 hours with an illuminance of 95.33 Lux and attenuation rate of 23.01%,which is lower than the that of pristine fabric-based ACEL textile(37.94%).Besides,after repeated bending for 1000 times,it still maintained excellent luminescence only with a reduction rate of 9.46%,which is lower than that of pristine fabric-based ACEL textile(14.43%).What's more,it can still operate normally after being immersed in deionized water for 6 hours with a loss rate of 11.00%,which is slightly higher than that of pristine fabric-based ACEL textile(6.97%).However,it can be improved by packaging technology.Finally,based on the previous study of pristine fabric-based ACEL textiles with mixed color,in this study,an ACEL textile combining different kinds of colors,which can adjust the color of device by changing the frequency of the supplied AC power.In this way,the application of the ACEL textile can be expanded.