Study of Electroplex Emission from Organic Electroluminescent Devices with Rare Earth Complex

A novel organic electroluminescent device was made with the structure of ITO/PVK: Tb0.5Eu0.5(TTA)3Dipy/BCP/Alq3/Al(a) which utilized the rare earth complex Tb0.5Eu0.5(TTA)3Dipy as the emitting layer. When it was driven under a direct electric field, 612 nm emission from Eu3+ and 410 nm emission from PVK were observed. In addition, in the EL spectrum a new peak at 490 nm appeared. From the analysis of different devices, the mechanism of the new emission was studied. It was concluded that the new emission was the electroplex originating from the interface between the ligand (TTA)3Dipy and BCP.