Study on PI/GLASS Substrate with Reflecting Anode for Top-emission OLEDs

• Main Authors: Feng-Tze Chen, 陳逢澤
• Other Authors: Chih-Hao Chang
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/28981620694461821551

碩士 === 元智大學 === 光電工程學系 === 104 === Flexible OLED panels offer several additional advantages over glass-based displays: they are lighter, thinner and much more durable. In this thesis, we focused on the development of a new flexible substrate with high reflectivity and flexible electrode. Flexible polyimide (PI) substrate which has high-temperature process resistant property was chosen in this study. Recently, the ITO-Metal-ITO (IMI) electrode had drawn great attention because of its several advantages including high reflectivity, high conductivity, and flexible characteristics. Thus, we propose a new IMI structure which compose of ITO-Ag alloy-ITO multilayer. First, the surface morphology of Ag alloy thin film was examined and the results indicated that Ag alloy possesses high brine resistance and thermal stability. Furthermore, the ITO-Ag alloy-ITO thin film has high reflectivity (i.e., 98%~99%) and low sheet resistance (i.e., 0.238Ω/□). Then, the ITO-Ag alloy-ITO film coated on PI substrate was used as the reflective anode in fabricating of the red, green, and blue OLEDs. The tested flexible devices with ITO-Ag alloy-ITO electrode showed great performance. On the other hand, the lift-off processes and curvature tests of the IGZO TFT coated on PI substrate were also examined. The results indicated that the tested TFT maintained similar electrical property after the PI substrate lifting off the glass substrate. In addition, the TFT coated on PI substrate exhibited similar transistor properties after the tensile and compressive stress tests.