Fabrication of a high quility bank and Uniformity of Polymer thin film

• Main Authors: Heng-Chin Lin, 林恒勤
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/71363833676304121831

碩士 === 國立中正大學 === 光機電整合工程所 === 94 === Abstract Polymer light emitting diodes, PLEDs, commonly consist of several polymer layers sandwiched between an anode and a cathode. One of the important advantages of PLEDs over inorganic LEDs lies in the easy construction of polymers. The light emitting polymeric materials can usually be solved in solvents and thus are able to be fabricated from the liquid state. Spin coating and ink-jet printing (IJP) are the two major techniques that are employed to the PLED fabrication and, among them, the IJP is the one that has the possibility for individually patterning R, G, and B colors. During the past several years, another technique, the so-called micro-spotting method, for the fabrication of a full-color PLED has been being investigated in our lab. The main focuses of the present study are thus placed on two important issues in the fabrication process of the micro-spotting method: improving the film uniformity and construction of bank structure. The film uniformity improvement was based on the idea of using the co-solvent technique and several pre- and post-processing techniques are also studied. An optimum proportion regarding amounts of co-solvents that can improve the uniformity of a poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene], MEH-PPV, film is presented. By incorporating the micro-contact printing technique, a bank structure made of polyimide, PI, was demonstrated and, compared to PMMA, the PI bank shows a better ability to withstand solvability of solvents. A PLED device based on the present method is finally demonstrated. Because the material of emission layer is solution type, we can deposit this layer by spin coating and ink-jet printing. Ink-jet printing is the main technology to fabricate full color PLED. According to ink-jet printing process, our laboratory has used micro-spotting to deposit emission layer on substrates and combined micro contact printing to fabricate banks for PLED. We also tried to improve the uniformity of thin film by using different solvents. This thesis continues our before research. For bank fabrication, we change the material which tolerates organic solvent and high temperature for improving bank characteristics. For polymeric thin film, we attempt to find the better proportion of co-solvent to improve the uniformity of thin film. We also attempt other methods, such as pre-wetting to substrate, heating to polymeric thin films, and combining with micro-spotting and micro contact printing to deposit polymeric thin films. Finally, we make a PLED by using the better results mentioned above.