Application Of Aluminum Phthalocyanine Chloride Buffer Layer In Organic Light-emitting Diodes

The performance of organic light-emitting diodes (OLEDs) can be greatly improved by utilizing buffer layers. This thesis focused on the effect of aluminum phthalocyanine chloride (AlPcCl) anode buffer layer on the properties of OLED. The results are as follows:1. We demonstated that AlPcC1 anode buffer layers can greatly improve the luminance and efficiency of OLEDs with varies AlPcC1 thickness. The optimum thickness of AlPcC1 buffer layer was found to be 5 nm. We also discussed the mechanism for performance improvement.2. To research the thermal stability of OLED, the prepared OLEDs were respectively transferred to 110℃and 80℃heated ovens under voccum environment. It was found that after 1 hour annealing at 110℃, the control device (without AlPcCI buffer layer) decayed seriously, but the OLED with a AlPcCl anode buffer layer was stable, with only a little decay. When the OLEDs were annealed 1 hour at 80℃, the properties of control device increased greatly. However, the properties of annealed control devices is not superior to the AlPcCl-OLED. Consequently, AlPcCl anode buffer layer could effectively improve OLED thermal stability.