The Study of Encapsulation for Longevity of Organic Electroluminescent Devices with Passivation Layer

• Main Authors: Mu-Shian Chen, 陳牧賢
• Other Authors: Nyen-Ts Chen
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/60228739830794034960

碩士 === 國立屏東科技大學 === 機械工程系所 === 98 === In this work, we deposited the passivation layer on devices by vacuum evaporation to investigate the effect of OLED with passivation layer and encapsulation. The device structure was ITO/NPB/Alq3/LiF/Al. A m-MTDATA/SiO2 passivation layer was deposited to separate hydrosphere and prevent the degradation. The electrical and emissive properties of device with and without passivation layer are compared and the degradation was observed. In this case, a passivation layer process did not influence the electrical and emissive characteristic of device and enhanced the lifetime in the air. The current density of device was set at 10 mA/cm2 and the initial luminance was 300 cd/m2. Under R.H 50 % and R.H 70 % in the air, the half-life of device with passivation layer improves by 6 times and 5 times, respectively. Besides, the half-life of device with passivation layer and encapsulation improves by 24 times and 27 times, respectively. According to the experiment results, we conclude that adding a passivation layer in the encapsulation device effectively separates hydrosphere and enhances the device lifetime.