Abstract
Stacked organic light-emitting devices (OLEDs) based on a europium complex Eu(TTA) 3(Tmphen) (TTA = thenoyltrifluoroacetone,Tmphen = 3,4,7,8-tetramethyl-1,10-phenanthroline) were fabricated. In this stacked OLEDs, Li:BCP/V 2O 5 was used the intermediate charge generation layer sandwiched between two identical emissive units consisting of TPD/CBP:DCJTB:Eu(TTA) 3(Tmphen)/BCP. As expected, the brightness and electroluminescent (EL) current efficiency were approximately enhanced by double times that of conventional single-unit devices. The stacked OLEDs showed the maximum luminance up to 3000 cd/m 2 at a current density of 190 mA/cm 2 and a current efficiency of 14.5 cd/A at a current density of 0.08 mA/cm 2. At the brightness of 100 cd/m 2, the current efficiency reached 10 cd/A at a current density of 1.6 mA/cm 2.
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