Electro-optical measurements, stability, and physical charge behavior of rare-earth based organic light emitting diode

In this work we report for the first time the electroluminescence of two different kinds of rare earth complexes based Organic Light Emitting Diodes, the Tb(ACAC)3bipy [Tris (acetylacetonate) - 2,2' - bipyridinyl - terbium(III)] and the Eu(TTA)3bipy [tris(4,4,4 -trifluoro -1 - (2 - thienyl) -1,3 - butanediono - 2,2' - bipyridinyl - europium(III)]. In both devices the corresponding electroluminescence spectrum is obtained (red for europium with (x,y) CIE coordinates near (0.64, 0.34) and green for terbium near (0.28, 0.55) coordinates) at a driving voltage near 16 - 17 V with a maximum electrical current of 1 mA. The Wall Plug Efficiency is about 10-3% in both cases.

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