Organic Light-Emitting Diodes Based on New Oxadiazole and Pyrazoline Derivatives

The bilayer heterojunction devices were fabricated successfully by using a novel oxadiazole derivative:2,2-(2,5-thiophenediyl)bis(5-(4-methyl)phenyl-1,3,4-oxadiazole)(T-OXD)as the electron-transporting layer(ETL)and a pyrazoline derivative:1-phenyl-3-(dimethylamino)styryl-5-(p-(dimethylamino)phenyl)pyrazoline(PDP)as the light-emitting layer and the hole-transporting layer.The emission at 500nm was derived from PDP layer.In comparison with the bilayer device of tris(8-hydroxyquinoline)aluminum(Alq)as the ETL,the luminous efficiency of the PDP/T-OXD heterojunction device was enhanced by 104 times.