Study on the Electrical and Optical characteristic of Transparent Electrode for Top Emission Organic Light Emitting Diode

• Main Authors: Sung, Jung-Hsuan, 宋榮軒
• Other Authors: Chen, Fang-Chung
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/48208651617747723934

碩士 === 國立交通大學 === 平面顯示技術碩士學位學程 === 104 === This thesis focus on improve the half-transparent cathode of Top Emission Organic Light Emitting Diode (TOLED). First, We have demonstrated the top emitting OLED, which have multi-layer structure cathode consist IZO/Ag/IZO. The critical dimension of Ag is 10nm. The sheet resistance of the sandwich (30/10/30) nm is significant lower than single IZO (60nm) film of 95%. In the spectrum of 390~630nm, the transmittance of sandwich cathode is higher than single IZO film of 8.5%. In order to optimize micro-cavity effect, the optical thickness of sandwich cathode is optimized to (10/10/80) nm. The current efficiency, Power efficiency and EQE which compare to control device can be improved 7.18cd/A, 5.19lm/W and 2.35% at 10mA/cm2 operating respectively. Devices optical performance can be controlled by adjusting sandwich electrode optical thickness. From the portion of view angle. The blue shifting of spectrum could be improved via introduce Micro-cavity effect into the devices design but electroluminescent intensity will be decay significantly if increase the view angle. Second, study on the transparent conductive oxide. Indium Gallium Oxide (IGO) exhibits high transmittance and low absorption characteristic. We have demonstrated top tandem white OLED with IGO capping layer which has better optical performance. The current efficiency could be improved to 6% at 10mA/cm2 operating.