The Study of Novel Nano-Structure for Oled Device Application

Over the past few years, the research focused on energy saving technique is being given high priorityall over the world. Organic light emitting diodes (OLED) with the advantages of high internal quantumefficiency, greater ranges of color, fast response time, lower power consumption and flexibility have led totheir application in a variety of fields, such as full-color displays and solid state lighting. The basic structureof highly efficient OLED device contains different functionality layers as HIL, HTL, EBL, EML, HBL, ETLand EIL between the two electrodes. Although the IQE of OLED device has been reported theoreticallyachieved almost 100%, the EQE can only reach about 20%. This indicates that about 80% of the internallygenerated light is limited or lost inside the device. The reason of a large amount of generated light lost isgenerated by the total internal reflection and waveguide effect attributed to the high refractive index contrastamong the constitutive layers (nair 1, nglass 1.45, nITO 1.8 and norganic 1.7) of the OLED device.Therefore, to extract the guided and trapped light inside the device into external modes is an important topicfor achieving highly efficient OLED.As our previous investigations, the highly order colloidal crystal and its’ inversed structure could beeasily synthesized by assembling the monodisperse nano-spheres and had already applied on the fields ofLED, Solar cell and OLED. In this project, we’ll try to enhance the LEE of polymer organic light-emittingdiode (PLED) device with the application of single layer nano-spheres array technology. This projectemphasizes the design and fabrication of the nano-structure inside and outside surface of the PLED device.The LEE of the PLED device might be enhanced due to the destruction of total internal reflection by nanostructure,which is a good answer to the development of PLED device with low cost, mass production andhigh LEE.This project expects to achieve the following targets:1st year :1. By the use of ICP etching technology of nano-sphere, we’ll fabricate different sizes and structures ofglass patterned substrates for PLED device to enhance the LEE of the device.2. Research and development a novel thin-film with double periodicity structures to enhance the LEE of thedevice.3. The goal of this year is to enhance the power efficiency of the PLED device about 150%.2nd year :1. Using the single layer sphere array substrate to fabricate a novel reusable nano-structure photomask forexposing technology application.2. Combine the study of first and second year to enhance the power efficiency of the PLED device about175%.3rd year :1. Research and development a novel technology with the nano-spheres and laser to fabricate substrate withnanostructures for flexible PLED device application.2. Combine the study of pass two years and this year to enhance the power efficiency of the PLED deviceabout 200%.3. To fabricate the flexible PLED device with nano-structures and enhance the power efficiency of thedevice about 175%.