The Assembly Of Nanowire Arrays Based On Wettability Theory And It's Applications In QLEDs

The morphology and the wetting state of the solution can be controlled by using the difference of the wettability between the two surfaces and the spatial distribution of the solution in the interface.The order micro nano assembly structure can be obtained by regulating the infiltration process.This new technology presents obvious advantage and great application potential in constructing patterned nanomaterials in orderly structure template.Quantum dot light emitting diodes(QLEDs)is a new type of light-emitting diodes,with the advantages of higher luminous efficiency,color adjustable,wider color gamut,better color saturation and vividness,lower cost of energy and other advantages.Consequently,the quantum dot electroluminescent technology has become a promising candidate for next generation of new display technology.The preparation and structure control of quantum dot layer is very important in the construction of QLEDs devices.Many methods have been developed,but there still are some shortcomings.At present,the development of an efficient and fast quantum dot layer preparation method has become an important research content in this field.Based on the background,in this dissertation,we intend to use the assembled method based on wettability to adjust the surface energy and surface microstructure of the solid interface to control the interface infiltration,and then control the backwash process of the solution in the interface to construct a large area,patterned nanomaterial assembly structure.From the perspective of the device structure,the superhydrophobic template method to assemble nanowires is used to build both QDs pattern and pattern structure of the electrode,and all can be applied to the structure of the pattern QLEDs device.The interfacial wettability of the template and the regulation of the patterning structure by the infiltration process have been systematically studied,and the suitable assembled method for the device construction is obtained.As a result,a simple,controllable and relatively efficient construction method for quantum dot array and electrode array in QLEDs devices is hoped to developed.The main contents of this dissertation are as follows:(1)In the second chapter,the sandwich assembled system is designed based on the principle of difference wettability between the super-hydrophobic silicon column and the super-hydrophilic substrate interface.We can achieve the silver nanoparticle one-dimensional nanowire array structure which is the thickness,length,width,orientation controllable assembly block.We studied the regulation of the refraction process on the assembly structure and transferred the silver nanowire arrays with special configurations onto the flexible substrates to produce flexible electrode materials.Finally its electrical properties of the measurement have been tested,the resistance of 7 ? or so,better than the traditional ITO 15 ?.The electrode material is expected to be used to purchase flexible QLEDs devices.(2)On the basis of the sandwich method with infiltration difference to assemble the one-dimensional nanowire array structure of water-soluble silver nanoparticles,the interface system was modified to expand the material to the oil-soluble quantum dots system.Through the surface modification of the silicon column and the surface control of the substrate,the difference of the wettability of the oily solution can be constructed,and the one-dimensional nanostructures of the quantum dots were assembled by regulating the infiltration process of the oil-soluble solution.We investigated the effect of the parameters such as the configuration of template,the concentration of solution and the environment of hatching.The CdTe / ZnS quantum dots in toluene solvent were used and the red,green and blue quantum dots of the one-dimensional nanometer array structure all can be assembled successfully.By adjusting the experimental parameters can be prepared with a minimum of 2 ?m quantum dot nanowire array structure.The QLEDs light emitting device with the patterned quantum dot layer is prepared by applying the assembled green and red quantum dot assembly structure to the QLEDs device.The results show that the proposed method can quickly and efficiently fabricate the patterned quantum dot layer and can be successfully applied to QLEDs devices.(3)The silicon column templates used in the second and third chapter have the advantages of both structural rules and easy modification,but it also have some defeats such as long preparation cycle,the preparation of higher prices and other issues.So it is not conducive to industrial production on the direct application.In order to solve this problem,in the fourth chapter,we try to use the low cost,short preparation cycle photoresist template to build the array structure.The SU-8 photoresist is etched into a template with a special configuration,and its surface is modified to construct a surface with difference wettability.The results show that the photoresist template can also be used for assemble of the array structure.The use of photoresist templates can greatly improve the efficiency of the experiment,and significantly reduce the cost of the experiment.