Study On Stretchable Electroluminescent Devices Based On Silver Nanowire Electrodes

Stretchable alternating current electroluminescent display represents an emerging form of optoelectronic technology,which combines the light-emitting properties with mechanical compliance.The widespread application of the deformable form of display is impeded due to the lack of an efficient fabrication approach.In this thesis,a series of fully screen-printed,multicolor,and stretchable electroluminescent display devices based on silver nanowire transparent electrodes and stretchable dielectric nanocomposites were prepared and exhibited good emissive features,excellent stretchability,low voltage operation,and colorful emissions.Furthermore,the stretchable light emitting device is applied to the skin of human body,and a wearable electronic device with response to sound is realized by controlling the electrical signal.The main conclusions of this thesis are as follows:(1)Silver nanowire patterned electrode was prepared by screen printing technology.The result shows that the electrical performance and light transmittance of the long silver nanowire electrode are superior to that of the short silver nanowire.This has laid a foundation for the preparation of stretchable ac electroluminescent devices and also provided a low-cost and more economical process for the preparation of superior silver nanometer electrodes.(2)Electroluminescent layers with high dielectric constant were patterned by screen printing technique,and tested with various sizes,thickness and proportion,to explore the photoelectric properties and tensile properties of device.The experimental results show that the dielectric constant of BTO-added PVDF HFP is three times higher than that of pure PVDF HFP,and the corresponding luminous intensity is two times greater than the latter.At the same time,the stretchable electroluminescent devices have stable photoelectric performance under different mechanical tensile conditions.(3)ACEL devices with three different colors,ZnS:Cu(green),ZnS:Cu(blue)and ZnS:Mn(orange)were prepared,and they show stable tensile properties in uniaxial tension and maintained good luminescence properties after repeated tensile test.This provides potential application value of wearable electronic devices.(4)A pure color stretchable AC electroluminescent device was prepared and sticked to the skin of human body.The luminescence flick ered with the variance of sound or music through the control of electrical signal and realized wearable electrical system that can response to sound or gesture.