Abstract
Pure red organic light-emitting diodes based on a dinuclear europium complex with a structure of (TTA)3Eu(PYO)2Eu(TTA)3 (TTA=thenoyltrifluoroacetonate, PYO=pyridine N-oxide) were presented. The devices showed pure red emission at a peak wavelength of 612nm with a full width at half maximum of 3nm, which is a characteristic emission from Eu3+ ion based on 5D0→7F2 transition. The maximum brightness and electroluminescent (EL) efficiency reached 340cd/m2 at a driving voltage of 19V and 2.4cd/A (0.78lm/W) at a current density of 0.14mA/cm2, respectively.
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