Efficiency properties of OLED based on Zn(PQ)2 as electron transporting layer and hole blocking layer

We have synthesized 8-hydroxy-7-propylquinoline (Zn(PQ)
₂
) to use in OLED. Photoluminescence (PL) peak of Zn(PQ)
₂
was observed at 555 nm which showed yellow emission. In the cyclic voltammetry (CV) experiment, the HOMO and the LUMO of the Zn(PQ)
₂
measured to be 6.7 eV and 3.3 eV. So we expected that Zn(PQ)
₂
could be used as electron transporting layer (ETL) and hole blocking layer (HBL). In this study, we investigated the efficiency properties of OLED based on Zn(PQ)
₂
as ETL and HBL. Prior to film deposition, ITO substrate performed surface treatment by UV-ozone for 1 minute. Improvement of the OLED performance can be attributed to the reduction of the electron injection barrier of the Zn(PQ)
₂
layer.