| Summary: | 碩士 === 國立成功大學 === 機械工程學系碩博士班 === 93 === The film of emitting layer on the electroluminescence devices was fabricated by etching in the past. It usually takes lots of time during the etching process and reduce the density of defect to a desired level. With the development of nanotechnology, it is now feasible to aggregation nanoparticles to design the film structure. The nanoparticles will aggregate more closely by controlling the their reactions, However, luminescence efficiency is mainly depends on the defect of the film on emitting layers resulting from irregular alignment among moleculars because the defect causes inefficient carrier transmission. For this reason, the goal of the work is to develop a theoretical model to accommodate the structure of nanoparticles aggregation and the details of carrier transmission. In order to precisely characterize the quantum efficiency of the electro-photo translation well through the theoretical model, a computerized simulation system based on molecular dynamics theory was established.
In order to meet the objective of raising the electro-photo translation efficiency, we define an index parameter for quantum efficiency of the luminiferous component. The behavior of nanoparticles aggregation process was we obtained via a molecular dynamics approach. In addition, the defect density is estimated by analyzing the particle allocation situation with non-dimensional boundary length. At the same time, by using the carriers transmission theory, a recombination efficiency of electron and the hole on the film structure was estimated. Eventually, the comprehensive model has been established. The computed results obtained by using the proposed simulation system are employed to compare with experimental data in literature. It is found that the results obtained by the present model agree well with those given in the literature. The design procedure presented in the work, was found practical and accurate for the application in light emitted devices and microprobes.
Several system parameters that are closed influence the film development including the of ion solution , contact angle, Hamaker number, height of interface, was carefully studied. It is found via statistics analysis that the intensity of ion solution and the contact angle are significantly important factors affecting the behavior of particle aggregation. The simulated result showed that the estimated current density is closer to experiment data than those obtained by the traditional theory computed. Two different design examples are presented to illustrate the efficiency of the presented procedure that can be used to characterize more accurately the physical parameters preferred luminiferous efficiency can be achieved.
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