Synthesis and electroluminescence characterization of a new aluminium complex, [8- Hydroxyquinoline] Bis [2,2’Bipyridine] Aluminium Al(Bpy)2q

We have synthesized and characterized a new electroluminescent material, [8-Hydroxyquinoline] Bis [2,2’Bipyridine] aluminium. Solution of this material Al(Bpy)₂q in toluene showed absorption maxima at 380nm which was attributed to the moderate energy (π – π*) transitions of the aromatic rings. The photoluminescence spectrum of Al(Bpy)₂q in toluene solution showed peak at 518 nm.This material shows thermal stability up to 300₀C. The structure of the device is ITO/F4-TCNQ(1nm)/α-NPD(35nm)/Al(Bpy)₂q(35nm)/ BCP(6nm)/Alq₃(28nm)/LiF(1nm)/Al(150nm). This device exhibited a luminescence peak at 515 nm (CIE coordinates, x=0.32,y=0.49). The maximum luminescence of the device was 214 Cd/m₂ at 21V. The maximum current efficiency of OLED was 0.12 Cd/A at 13V and maximum power efficiency was 0.03 lm/W at 10 volt.