Current Transport Mechanisms in Organic Light-Emitting Diode

• Main Authors: Yi-fang Ou, 歐宜芳
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/49515455703667149934

碩士 === 國立中山大學 === 電機工程學系研究所 === 93 === Organic light-emitting diode has several advantages using in the flat penal display, but it is still needed to improve the disadvantages. The charge-carriers of the organic layers are one of the dominant factors to influence the performance of OLED. Hence, it is worth to study and understand the charge transporting behaviors by the theoretical simulation in the organic layers of OLED, and that is helpful for the OLED in future. In this study, three kinds of models are used to simulate the characteristics of several different organic light-emitting devices, and it also try to compare the relationship between the current density and voltage. Three kinds of models are described as (1) The field-dependent carrier mobility model (FDM model), (2) An exponential distribution of traps model (EDT model), and (3) The field dependent trap occupancy model (FDTO model). For the simulation of three models, the characteristics of several hole-only devices and electron-only devices were analyzed to investigate and discuss the organic layer of the devices with different materials. In addition, by varying the parameters such as the thickness and temperature, a comparison was made between the results simulated from models with the values obtained from experimental works. Finally, based on above results, the characteristics of OLED could be improved for future applications.